Re-add mesa-6.4.1 which was accidentally deleted

97 files changed, 18847 insertions, 0 deletions

diff --git a/src/glu/sgi/libnurbs/internals/arc.cc b/src/glu/sgi/libnurbs/internals/arc.cc
new file mode 100644
index 00000000000..f795e00cd7e
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/arc.cc
@@ -0,0 +1,347 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * arc.c++
+ *
+ */
+
+#include <stdio.h>
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "arc.h"
+#include "bin.h"
+#include "bezierarc.h"
+#include "pwlarc.h"
+#include "simplemath.h"
+
+/* local preprocessor definitions */
+#define ZERO		0.00001/*0.000001*/
+
+const int	Arc::bezier_tag = (1<<13);
+const int	Arc::arc_tag = (1<<3);
+const int	Arc::tail_tag = (1<<6);
+
+/*--------------------------------------------------------------------------
+ * makeSide - attach a pwl arc to an arc and mark it as a border arc
+ *--------------------------------------------------------------------------
+ */
+
+void
+Arc::makeSide( PwlArc *pwl, arc_side side )
+{
+    assert( pwl != 0);
+    assert( pwlArc == 0 );
+    assert( pwl->npts > 0 );
+    assert( pwl->pts != 0);
+    pwlArc = pwl;
+    clearbezier();
+    setside( side );
+}
+
+
+/*--------------------------------------------------------------------------
+ * numpts - count number of points on arc loop
+ *--------------------------------------------------------------------------
+ */
+
+int
+Arc::numpts( void )
+{
+    Arc_ptr jarc = this;
+    int npts = 0;
+    do {
+	npts += jarc->pwlArc->npts;
+	jarc = jarc->next;
+    } while( jarc != this );
+    return npts;
+}
+
+/*--------------------------------------------------------------------------
+ * markverts - mark each point with id of arc
+ *--------------------------------------------------------------------------
+ */
+
+void
+Arc::markverts( void )
+{
+    Arc_ptr jarc = this;
+        
+    do {
+	TrimVertex *p = jarc->pwlArc->pts;
+	for( int i=0; i<jarc->pwlArc->npts; i++ )
+	    p[i].nuid = jarc->nuid;
+	jarc = jarc->next;
+    } while( jarc != this );
+}
+
+/*--------------------------------------------------------------------------
+ * getextrema - find axis extrema on arc loop
+ *--------------------------------------------------------------------------
+ */
+
+void
+Arc::getextrema( Arc_ptr extrema[4] )
+{
+    REAL leftpt, botpt, rightpt, toppt;
+
+    extrema[0] = extrema[1] = extrema[2] = extrema[3] = this;
+
+    leftpt = rightpt = this->tail()[0];
+    botpt  = toppt   = this->tail()[1];
+
+    for( Arc_ptr jarc = this->next; jarc != this; jarc = jarc->next ) {
+	if ( jarc->tail()[0] <	leftpt ||
+	    (jarc->tail()[0] <= leftpt && jarc->rhead()[0]<=leftpt))  {
+	    leftpt = jarc->pwlArc->pts->param[0];
+	    extrema[1] = jarc;
+	}
+	if ( jarc->tail()[0] >	rightpt ||
+	    (jarc->tail()[0] >= rightpt && jarc->rhead()[0] >= rightpt)) {
+	    rightpt = jarc->pwlArc->pts->param[0];
+	    extrema[3] = jarc;
+	}
+	if ( jarc->tail()[1] <	botpt ||
+	    (jarc->tail()[1] <= botpt && jarc->rhead()[1] <= botpt ))  {
+	    botpt = jarc->pwlArc->pts->param[1];
+	    extrema[2] = jarc;
+	}
+	if ( jarc->tail()[1] >	toppt ||
+	    (jarc->tail()[1] >= toppt && jarc->rhead()[1] >= toppt))  {
+	    toppt = jarc->pwlArc->pts->param[1];
+	    extrema[0] = jarc;
+	}
+    }
+}
+
+
+/*-------------------------------------------------------------------------
+ * show - print to the stdout the vertices of a pwl arc
+ *-------------------------------------------------------------------------
+ */
+
+void
+Arc::show()
+{
+#ifndef NDEBUG
+    dprintf( "\tPWLARC NP: %d FL: 1\n", pwlArc->npts );
+    for( int i = 0; i < pwlArc->npts; i++ ) {
+	 dprintf( "\t\tVERTEX %f %f\n", pwlArc->pts[i].param[0],
+			pwlArc->pts[i].param[1] );
+    }
+#endif
+}
+
+/*-------------------------------------------------------------------------
+ * print - print out the vertices of all pwl arcs on a loop
+ *-------------------------------------------------------------------------
+ */
+
+void
+Arc::print( void )
+{
+    Arc_ptr jarc = this;
+
+#ifndef NDEBUG
+    dprintf( "BGNTRIM\n" );
+#endif
+    do {
+	jarc->show( );
+	jarc = jarc->next;
+    } while (jarc != this);
+#ifndef NDEBUG
+    dprintf("ENDTRIM\n" );
+#endif
+}
+
+/*-------------------------------------------------------------------------
+ * isDisconnected - check if tail of arc and head of prev meet
+ *-------------------------------------------------------------------------
+ */
+
+int
+Arc::isDisconnected( void )
+{
+    if( pwlArc == 0 ) return 0;
+    if( prev->pwlArc == 0 ) return 0;
+
+    REAL *p0 = tail();
+    REAL *p1 = prev->rhead();
+
+    if( ((p0[0] - p1[0]) > ZERO) || ((p1[0] - p0[0]) > ZERO) ||
+	((p0[1] - p1[1]) > ZERO) || ((p1[1] - p0[1]) > ZERO)  ) {
+#ifndef NDEBUG
+	dprintf( "x coord = %f %f %f\n", p0[0], p1[0], p0[0] - p1[0] );
+	dprintf( "y coord = %f %f %f\n", p0[1], p1[1], p0[1] - p1[1] );
+#endif
+	return 1;
+    } else {
+	/* average two points together */
+	p0[0] = p1[0] = (p1[0] + p0[0]) * 0.5;
+	p0[1] = p1[1] = (p1[1] + p0[1]) * 0.5;
+	return 0;
+    }
+}
+
+/*-------------------------------------------------------------------------
+ * neq_vert - assert that two 2D vertices are not equal
+ *-------------------------------------------------------------------------
+ */
+
+inline static int
+neq_vert( REAL	*v1, REAL *v2 )
+{
+     return ((v1[0] != v2[0]) || (v1[1] != v2[1] )) ? 1 : 0;
+}
+
+/*-------------------------------------------------------------------------
+ * check - verify consistency of a loop, including
+ *		1) if pwl, no two consecutive vertices are identical
+ *		2) the circular link pointers are valid
+ *		3) the geometric info at the head and tail are consistent
+ *-------------------------------------------------------------------------
+ */
+
+int
+Arc::check( void )
+{
+    if( this == 0 ) return 1;
+    Arc_ptr jarc = this;
+    do {
+	assert( (jarc->pwlArc != 0) || (jarc->bezierArc != 0) );
+
+	if (jarc->prev == 0 || jarc->next == 0) {
+#ifndef NDEBUG
+	    dprintf( "checkjarc:null next/prev pointer\n");
+	    jarc->print( );
+#endif
+	    return 0;
+	}
+
+	if (jarc->next->prev != jarc) {
+#ifndef NDEBUG
+	    dprintf( "checkjarc: pointer linkage screwed up\n");
+	    jarc->print( );
+#endif
+	    return 0;
+	}
+
+	if( jarc->pwlArc ) {
+#ifndef NDEBUG
+	    assert( jarc->pwlArc->npts >= 1 );
+	    assert( jarc->pwlArc->npts < 100000 );
+/*
+	    for( int i=0; i < jarc->pwlArc->npts-1; i++ )
+		assert( neq_vert( jarc->pwlArc->pts[i].param,
+			     jarc->pwlArc->pts[i+1].param) );
+*/
+#endif
+	    if( jarc->prev->pwlArc ) {
+		if( jarc->tail()[1] != jarc->prev->rhead()[1] ) {
+#ifndef NDEBUG
+		    dprintf( "checkjarc: geometric linkage screwed up 1\n");
+		    jarc->prev->show();
+		    jarc->show();
+#endif
+		    return 0;
+		}
+		if( jarc->tail()[0] != jarc->prev->rhead()[0] ) {
+	        
+#ifndef NDEBUG
+		    dprintf( "checkjarc: geometric linkage screwed up 2\n");
+		    jarc->prev->show();
+		    jarc->show();
+#endif
+		    return 0;
+		}
+	    }
+	    if( jarc->next->pwlArc ) {
+		if( jarc->next->tail()[0] != jarc->rhead()[0] ) {
+#ifndef NDEBUG
+			dprintf( "checkjarc: geometric linkage screwed up 3\n");
+			jarc->show();
+			jarc->next->show();
+#endif
+			return 0;
+		}
+		if( jarc->next->tail()[1] != jarc->rhead()[1] ) {
+#ifndef NDEBUG
+			dprintf( "checkjarc: geometric linkage screwed up 4\n");
+			jarc->show();
+			jarc->next->show();
+#endif
+			return 0;
+		}
+	    }
+	    if( jarc->isbezier() ) {
+		assert( jarc->pwlArc->npts == 2 );
+		assert( (jarc->pwlArc->pts[0].param[0] == \
+                        jarc->pwlArc->pts[1].param[0]) ||\
+                        (jarc->pwlArc->pts[0].param[1] == \
+                        jarc->pwlArc->pts[1].param[1]) );
+	    }
+	}
+	jarc = jarc->next;
+    } while (jarc != this);
+    return 1;
+}
+
+
+#define TOL 0.00001
+
+inline long tooclose( REAL x, REAL y )
+{
+    return (glu_abs(x-y) < TOL) ?  1 : 0;
+}
+
+
+/*--------------------------------------------------------------------------
+ * append - append a jordan arc to a circularly linked list
+ *--------------------------------------------------------------------------
+ */
+
+Arc_ptr
+Arc::append( Arc_ptr jarc )
+{
+    if( jarc != 0 ) {
+	next = jarc->next;
+	prev = jarc;
+	next->prev = prev->next = this;
+    } else {
+	next = prev = this;
+    }
+    return this;
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/arc.h b/src/glu/sgi/libnurbs/internals/arc.h
new file mode 100644
index 00000000000..d30ac9011db
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/arc.h
@@ -0,0 +1,139 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * arc.h
+ *
+ * $Date: 2001/08/07 17:34:11 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/arc.h,v 1.2 2001/08/07 17:34:11 brianp Exp $
+ */
+
+#ifndef __gluarc_h_
+#define __gluarc_h_
+
+#include "myassert.h"
+#include "bufpool.h"
+#include "mystdio.h"
+#include "types.h"
+#include "pwlarc.h"
+#include "trimvertex.h"
+
+class Bin;
+class Arc;
+struct BezierArc;	
+
+typedef class Arc *Arc_ptr; 
+
+enum arc_side { arc_none = 0, arc_right, arc_top, arc_left, arc_bottom };
+
+
+class Arc: public PooledObj { /* an arc, in two list, the trim list and bin */
+
+public:
+    static const int bezier_tag;
+    static const int arc_tag;
+    static const int tail_tag;
+    Arc_ptr		prev;		/* trim list pointer */
+    Arc_ptr		next;		/* trim list pointer */
+    Arc_ptr		link;		/* bin pointers */
+    BezierArc *		bezierArc;	/* associated bezier arc */
+    PwlArc *		pwlArc;	/* associated pwl arc */
+    long		type;		/* curve type */
+    long		nuid;
+
+    inline		Arc( Arc *, PwlArc * );
+    inline		Arc( arc_side, long );
+
+    Arc_ptr		append( Arc_ptr );
+    int			check( void );
+    int			isMonotone( void );
+    int			isDisconnected( void );
+    int			numpts( void );
+    void		markverts( void );
+    void		getextrema( Arc_ptr[4] );
+    void		print( void );
+    void		show( void );
+    void		makeSide( PwlArc *, arc_side );
+    inline int		isTessellated() { return pwlArc ? 1 : 0; }
+    inline long 	isbezier() 	{ return type & bezier_tag; }
+    inline void 	setbezier() 	{ type |= bezier_tag; }
+    inline void 	clearbezier() 	{ type &= ~bezier_tag; }
+    inline long		npts() 		{ return pwlArc->npts; }
+    inline TrimVertex *	pts() 		{ return pwlArc->pts; }
+    inline REAL * 	tail() 		{ return pwlArc->pts[0].param; }
+    inline REAL * 	head() 		{ return next->pwlArc->pts[0].param; }
+    inline REAL *	rhead() 	{ return pwlArc->pts[pwlArc->npts-1].param; }
+    inline long		ismarked()	{ return type & arc_tag; }
+    inline void		setmark()	{ type |= arc_tag; }
+    inline void		clearmark()	{ type &= (~arc_tag); }
+    inline void		clearside() 	{ type &= ~(0x7 << 8); }
+    inline void		setside( arc_side s ) { clearside(); type |= (((long)s)<<8); }
+    inline arc_side	getside() 	{ return (arc_side) ((type>>8) & 0x7); }
+    inline int		getitail()	{ return type & tail_tag; }
+    inline void		setitail()	{ type |= tail_tag; }
+    inline void		clearitail()	{ type &= (~tail_tag); }
+};
+
+/*--------------------------------------------------------------------------
+ * Arc - initialize a new Arc with the same type and uid of
+ *	    a given Arc and a given pwl arc
+ *--------------------------------------------------------------------------
+ */
+
+inline
+Arc::Arc( Arc *j, PwlArc *p )
+{
+    bezierArc = NULL;
+    pwlArc = p;
+    type = j->type;
+    nuid = j->nuid;
+}
+
+/*--------------------------------------------------------------------------
+ * Arc - initialize a new Arc with the same type and uid of
+ *	    a given Arc and a given pwl arc
+ *--------------------------------------------------------------------------
+ */
+
+inline
+Arc::Arc( arc_side side, long _nuid )
+{
+    bezierArc = NULL;
+    pwlArc = NULL;
+    type = 0;
+    setside( side );
+    nuid = _nuid;
+}
+
+#endif /* __gluarc_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/arcsorter.cc b/src/glu/sgi/libnurbs/internals/arcsorter.cc
new file mode 100644
index 00000000000..d0b72c2ad10
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/arcsorter.cc
@@ -0,0 +1,174 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * arcsorter.c++
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/arcsorter.cc,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __gluarcsorter_c_
+#define __gluarcsorter_c_
+
+#include "glimports.h"
+#include "arc.h"
+#include "arcsorter.h"
+#include "subdivider.h"
+
+ArcSorter::ArcSorter(Subdivider &s) : Sorter( sizeof( Arc ** ) ), subdivider(s)
+{
+}
+
+int
+ArcSorter::qscmp( char *, char * )
+{
+    dprintf( "ArcSorter::qscmp: pure virtual called\n" );
+    return 0;
+}
+
+void
+ArcSorter::qsort( Arc **a, int n )
+{
+    Sorter::qsort( (void *) a, n );
+}
+
+void		
+ArcSorter::qsexc( char *i, char *j )// i<-j, j<-i 
+{
+    Arc **jarc1 = (Arc **) i;
+    Arc **jarc2 = (Arc **) j;
+    Arc *tmp = *jarc1;
+    *jarc1 = *jarc2;
+    *jarc2 = tmp;
+}	
+
+void		
+ArcSorter::qstexc( char *i, char *j, char *k )// i<-k, k<-j, j<-i
+{
+    Arc **jarc1 = (Arc **) i;
+    Arc **jarc2 = (Arc **) j;
+    Arc **jarc3 = (Arc **) k;
+    Arc *tmp = *jarc1;
+    *jarc1 = *jarc3;
+    *jarc3 = *jarc2;
+    *jarc2 = tmp;
+}
+  
+
+ArcSdirSorter::ArcSdirSorter( Subdivider &s ) : ArcSorter(s)
+{
+}
+
+int
+ArcSdirSorter::qscmp( char *i, char *j )
+{
+    Arc *jarc1 = *(Arc **) i;
+    Arc *jarc2 = *(Arc **) j;
+
+    int v1 = (jarc1->getitail() ? 0 : (jarc1->pwlArc->npts - 1));
+    int	v2 = (jarc2->getitail() ? 0 : (jarc2->pwlArc->npts - 1));
+
+    REAL diff =  jarc1->pwlArc->pts[v1].param[1] -
+	    	 jarc2->pwlArc->pts[v2].param[1];
+
+    if( diff < 0.0)
+	return -1;
+    else if( diff > 0.0)
+	return 1;
+    else {
+	if( v1 == 0 ) {
+	    if( jarc2->tail()[0] < jarc1->tail()[0] ) {
+	        return subdivider.ccwTurn_sl( jarc2, jarc1 ) ? 1 : -1;
+	    } else {
+	        return subdivider.ccwTurn_sr( jarc2, jarc1 ) ? -1 : 1;
+	    }
+	} else {
+	    if( jarc2->head()[0] < jarc1->head()[0] ) {
+	        return subdivider.ccwTurn_sl( jarc1, jarc2 ) ? -1 : 1;
+	    } else {
+	        return subdivider.ccwTurn_sr( jarc1, jarc2 ) ? 1 : -1;
+	    }
+	}
+    }    
+}
+
+ArcTdirSorter::ArcTdirSorter( Subdivider &s ) : ArcSorter(s)
+{
+}
+
+/*----------------------------------------------------------------------------
+ * ArcTdirSorter::qscmp - 
+  *		   compare two axis monotone arcs that are incident 
+ *		   to the line T == compare_value. Determine which of the
+ *		   two intersects that line with a LESSER S value.  If
+ *		   jarc1 does, return 1.  If jarc2 does, return -1. 
+ *----------------------------------------------------------------------------
+ */
+int
+ArcTdirSorter::qscmp( char *i, char *j )
+{
+    Arc *jarc1 = *(Arc **) i;
+    Arc *jarc2 = *(Arc **) j;
+
+    int v1 = (jarc1->getitail() ? 0 : (jarc1->pwlArc->npts - 1));
+    int	v2 = (jarc2->getitail() ? 0 : (jarc2->pwlArc->npts - 1));
+
+    REAL diff =  jarc1->pwlArc->pts[v1].param[0] -
+	         jarc2->pwlArc->pts[v2].param[0];
+ 
+    if( diff < 0.0)
+	return 1;
+    else if( diff > 0.0)
+	return -1;
+    else {
+	if( v1 == 0 ) {
+	    if (jarc2->tail()[1] < jarc1->tail()[1]) {
+	        return subdivider.ccwTurn_tl( jarc2, jarc1 ) ? 1 : -1;
+	    } else {
+	        return subdivider.ccwTurn_tr( jarc2, jarc1 ) ? -1 : 1;
+	    }
+	} else {
+	    if( jarc2->head()[1] < jarc1->head()[1] )  {
+	        return subdivider.ccwTurn_tl( jarc1, jarc2 ) ? -1 : 1;
+	    } else {
+	        return subdivider.ccwTurn_tr( jarc1, jarc2 ) ? 1 : -1;
+	    }
+	}
+    }
+}
+
+
+
+#endif /* __gluarcsorter_c_ */
diff --git a/src/glu/sgi/libnurbs/internals/arcsorter.h b/src/glu/sgi/libnurbs/internals/arcsorter.h
new file mode 100644
index 00000000000..06fa4321114
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/arcsorter.h
@@ -0,0 +1,79 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * arcsorter.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/arcsorter.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __gluarcsorter_h_
+#define __gluarcsorter_h_
+
+#include "sorter.h"
+#include "arcsorter.h"
+
+class Arc;
+class Subdivider;
+
+class ArcSorter : private Sorter {
+public:
+			ArcSorter(Subdivider &);
+    void		qsort( Arc **a, int n );
+protected:
+    virtual int		qscmp( char *, char * );
+    Subdivider&		subdivider;
+private:
+    void		qsexc( char *i, char *j );	// i<-j, j<-i 
+    void		qstexc( char *i, char *j, char *k ); // i<-k, k<-j, j<-i 
+};
+
+
+class ArcSdirSorter : public ArcSorter {
+public:
+			ArcSdirSorter( Subdivider & );
+private:
+    int			qscmp( char *, char * );
+};
+
+
+class ArcTdirSorter : public ArcSorter {
+public:
+			ArcTdirSorter( Subdivider & );
+private:
+    int			qscmp( char *, char * );
+};
+
+#endif /* __gluarcsorter_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/arctess.cc b/src/glu/sgi/libnurbs/internals/arctess.cc
new file mode 100644
index 00000000000..e633626de06
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/arctess.cc
@@ -0,0 +1,611 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * arctessellator.c++
+ *
+ */
+
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "arctess.h"
+#include "bufpool.h"
+#include "simplemath.h"
+#include "bezierarc.h"
+#include "trimvertex.h"
+#include "trimvertpool.h"
+
+#define NOELIMINATION
+
+#define steps_function(large, small, rate) (max(1, 1+ (int) ((large-small)/rate)));
+
+/*-----------------------------------------------------------------------------
+ * ArcTessellator - construct an ArcTessellator
+ *-----------------------------------------------------------------------------
+ */
+
+ArcTessellator::ArcTessellator( TrimVertexPool& t, Pool& p ) 
+	: pwlarcpool(p), trimvertexpool(t)
+{
+}
+
+/*-----------------------------------------------------------------------------
+ * ~ArcTessellator - destroy an ArcTessellator
+ *-----------------------------------------------------------------------------
+ */
+
+ArcTessellator::~ArcTessellator( void )
+{
+}
+
+/*-----------------------------------------------------------------------------
+ * bezier - construct a bezier arc and attach it to an Arc
+ *-----------------------------------------------------------------------------
+ */
+
+void
+ArcTessellator::bezier( Arc *arc, REAL s1, REAL s2, REAL t1, REAL t2 )
+{
+    assert( arc != 0 );
+    assert( ! arc->isTessellated() );
+
+#ifndef NDEBUG
+    switch( arc->getside() ) {
+	case arc_left:
+	    assert( s1 == s2 );
+	    assert( t2 < t1 );
+	    break;
+	case arc_right:
+	    assert( s1 == s2 );
+	    assert( t1 < t2 );
+	    break;
+	case arc_top:
+	    assert( t1 == t2 );
+	    assert( s2 < s1 );
+	    break;
+	case arc_bottom:
+	    assert( t1 == t2 );
+	    assert( s1 < s2 );
+	    break;
+	case arc_none:
+	    (void) abort();
+	    break;
+    }
+#endif
+    
+    TrimVertex *p = trimvertexpool.get(2);
+    arc->pwlArc = new(pwlarcpool) PwlArc( 2, p );
+    p[0].param[0] = s1;
+    p[0].param[1] = t1;
+    p[1].param[0] = s2;
+    p[1].param[1] = t2;
+    assert( (s1 == s2) || (t1 == t2) );
+    arc->setbezier();
+}
+
+
+/*-----------------------------------------------------------------------------
+ * pwl_left - construct a left boundary pwl arc and attach it to an arc
+ *-----------------------------------------------------------------------------
+ */
+
+void
+ArcTessellator::pwl_left( Arc *arc, REAL s, REAL t1, REAL t2, REAL rate )
+{
+    assert( t2 < t1 );
+
+/*    if(rate <= 0.06) rate = 0.06;*/
+/*    int nsteps = 1 + (int) ((t1 - t2) / rate ); */
+    int nsteps = steps_function(t1, t2, rate);
+
+
+    REAL stepsize = (t1 - t2) / (REAL) nsteps;
+
+    TrimVertex *newvert = trimvertexpool.get( nsteps+1 );
+    int i;
+    for( i = nsteps; i > 0; i-- ) {
+	newvert[i].param[0] = s;
+	newvert[i].param[1] = t2;
+	t2 += stepsize;
+    }
+    newvert[i].param[0] = s;
+    newvert[i].param[1] = t1;
+
+    arc->makeSide( new(pwlarcpool) PwlArc( nsteps+1, newvert ), arc_left );
+}
+
+/*-----------------------------------------------------------------------------
+ * pwl_right - construct a right boundary pwl arc and attach it to an arc
+ *-----------------------------------------------------------------------------
+ */
+
+void
+ArcTessellator::pwl_right( Arc *arc, REAL s, REAL t1, REAL t2, REAL rate )
+{
+    assert( t1 < t2 );
+
+/*    if(rate <= 0.06) rate = 0.06;*/
+
+/*    int nsteps = 1 + (int) ((t2 - t1) / rate ); */
+    int nsteps = steps_function(t2,t1,rate);
+    REAL stepsize = (t2 - t1) / (REAL) nsteps;
+
+    TrimVertex *newvert = trimvertexpool.get( nsteps+1 );
+    int i;
+    for( i = 0; i < nsteps; i++ ) {
+	newvert[i].param[0] = s;
+	newvert[i].param[1] = t1;
+	t1 += stepsize;
+    }
+    newvert[i].param[0] = s;
+    newvert[i].param[1] = t2;
+
+    arc->makeSide( new(pwlarcpool) PwlArc( nsteps+1, newvert ), arc_right );
+}
+
+
+/*-----------------------------------------------------------------------------
+ * pwl_top - construct a top boundary pwl arc and attach it to an arc
+ *-----------------------------------------------------------------------------
+ */
+
+void
+ArcTessellator::pwl_top( Arc *arc, REAL t, REAL s1, REAL s2, REAL rate )
+{
+    assert( s2 < s1 );
+
+/*    if(rate <= 0.06) rate = 0.06;*/
+
+/*    int nsteps = 1 + (int) ((s1 - s2) / rate ); */
+    int nsteps = steps_function(s1,s2,rate);
+    REAL stepsize = (s1 - s2) / (REAL) nsteps;
+
+    TrimVertex *newvert = trimvertexpool.get( nsteps+1 );
+    int i;
+    for( i = nsteps; i > 0; i-- ) {
+	newvert[i].param[0] = s2;
+	newvert[i].param[1] = t;
+	s2 += stepsize;
+    }
+    newvert[i].param[0] = s1;
+    newvert[i].param[1] = t;
+
+    arc->makeSide( new(pwlarcpool) PwlArc( nsteps+1, newvert ), arc_top );
+}
+
+/*-----------------------------------------------------------------------------
+ * pwl_bottom - construct a bottom boundary pwl arc and attach it to an arc
+ *-----------------------------------------------------------------------------
+ */
+
+void
+ArcTessellator::pwl_bottom( Arc *arc, REAL t, REAL s1, REAL s2, REAL rate )
+{
+    assert( s1 < s2 );
+
+/*    if(rate <= 0.06) rate = 0.06;*/
+
+/*    int nsteps = 1 + (int) ((s2 - s1) / rate ); */
+    int nsteps = steps_function(s2,s1,rate);
+    REAL stepsize = (s2 - s1) / (REAL) nsteps;
+
+    TrimVertex *newvert = trimvertexpool.get( nsteps+1 );
+    int i;
+    for( i = 0; i < nsteps; i++ ) {
+	newvert[i].param[0] = s1;
+	newvert[i].param[1] = t;
+	s1 += stepsize;
+    }
+    newvert[i].param[0] = s2;
+    newvert[i].param[1] = t;
+
+    arc->makeSide( new(pwlarcpool) PwlArc( nsteps+1, newvert ), arc_bottom );
+}
+
+/*-----------------------------------------------------------------------------
+ * pwl - construct a pwl arc and attach it to an arc
+ *-----------------------------------------------------------------------------
+ */
+
+void
+ArcTessellator::pwl( Arc *arc, REAL s1, REAL s2, REAL t1, REAL t2, REAL rate )
+{
+
+/*    if(rate <= 0.06) rate = 0.06;*/
+
+    int snsteps = 1 + (int) (glu_abs(s2 - s1) / rate );
+    int tnsteps = 1 + (int) (glu_abs(t2 - t1) / rate );
+    int nsteps = max(1,max( snsteps, tnsteps ));
+
+    REAL sstepsize = (s2 - s1) / (REAL) nsteps;
+    REAL tstepsize = (t2 - t1) / (REAL) nsteps;
+    TrimVertex *newvert = trimvertexpool.get( nsteps+1 );
+    long i;
+    for( i = 0; i < nsteps; i++ ) {
+	newvert[i].param[0] = s1;
+	newvert[i].param[1] = t1;
+	s1 += sstepsize;
+	t1 += tstepsize;
+    }
+    newvert[i].param[0] = s2;
+    newvert[i].param[1] = t2;
+
+    /* arc->makeSide( new(pwlarcpool) PwlArc( nsteps+1, newvert ), arc_bottom ); */
+    arc->pwlArc = new(pwlarcpool) PwlArc( nsteps+1, newvert );
+
+    arc->clearbezier();
+    arc->clearside( );
+}
+
+
+/*-----------------------------------------------------------------------------
+ * tessellateLinear - constuct a linear pwl arc and attach it to an Arc
+ *-----------------------------------------------------------------------------
+ */
+
+void
+ArcTessellator::tessellateLinear( Arc *arc, REAL geo_stepsize, REAL arc_stepsize, int isrational )
+{
+    assert( arc->pwlArc == NULL );
+    REAL s1, s2, t1, t2;
+
+    //we don't need to scale by arc_stepsize if the trim curve
+    //is piecewise linear. Reason: In pwl_right, pwl_left, pwl_top, pwl_left,
+    //and pwl, the nsteps is computed by deltaU (or V) /stepsize. 
+    //The quantity deltaU/arc_stepsize doesn't have any meaning. And
+    //it causes problems: see bug 517641
+    REAL stepsize = geo_stepsize; /* * arc_stepsize*/;
+
+    BezierArc *b = arc->bezierArc;
+
+    if( isrational ) {
+	s1 = b->cpts[0] / b->cpts[2];
+	t1 = b->cpts[1] / b->cpts[2];
+	s2 = b->cpts[b->stride+0] / b->cpts[b->stride+2];
+	t2 = b->cpts[b->stride+1] / b->cpts[b->stride+2];
+    } else {
+	s1 = b->cpts[0];
+	t1 = b->cpts[1];
+	s2 = b->cpts[b->stride+0];
+	t2 = b->cpts[b->stride+1];
+    }
+    if( s1 == s2 )
+	if( t1 < t2 )
+	    pwl_right( arc, s1, t1, t2, stepsize );
+	else
+	    pwl_left( arc, s1, t1, t2, stepsize );
+    else if( t1 == t2 )
+	if( s1 < s2 ) 
+	    pwl_bottom( arc, t1, s1, s2, stepsize );
+	else
+	    pwl_top( arc, t1, s1, s2, stepsize );
+    else
+	pwl( arc, s1, s2, t1, t2, stepsize );
+}
+
+/*-----------------------------------------------------------------------------
+ * tessellateNonlinear - constuct a nonlinear pwl arc and attach it to an Arc
+ *-----------------------------------------------------------------------------
+ */
+
+void
+ArcTessellator::tessellateNonlinear( Arc *arc, REAL geo_stepsize, REAL arc_stepsize, int isrational )
+{
+    assert( arc->pwlArc == NULL );
+
+    REAL stepsize	= geo_stepsize * arc_stepsize;
+
+    BezierArc *bezierArc = arc->bezierArc;
+
+    REAL size; //bounding box size of the curve in UV 
+    {
+      int i,j;
+      REAL min_u, min_v, max_u,max_v;
+      min_u = max_u = bezierArc->cpts[0];
+      min_v = max_v = bezierArc->cpts[1];
+      for(i=1, j=2; i<bezierArc->order; i++, j+= bezierArc->stride)
+	{
+	  if(bezierArc->cpts[j] < min_u)
+	    min_u = bezierArc->cpts[j];
+	  if(bezierArc->cpts[j] > max_u)
+	    max_u = bezierArc->cpts[j];
+	  if(bezierArc->cpts[j+1] < min_v)
+	    min_v = bezierArc->cpts[j+1];	  
+	  if(bezierArc->cpts[j+1] > max_v)
+	    max_v = bezierArc->cpts[j+1]; 
+	}
+
+      size = max_u - min_u;
+      if(size < max_v - min_v)
+	size = max_v - min_v;
+    }
+      
+    /*int	nsteps 		= 1 + (int) (1.0/stepsize);*/
+
+    int nsteps = (int) (size/stepsize);
+    if(nsteps <=0)
+      nsteps=1;
+
+    TrimVertex *vert	= trimvertexpool.get( nsteps+1 );
+    REAL dp 		= 1.0/nsteps;
+
+
+    arc->pwlArc 	= new(pwlarcpool) PwlArc();
+    arc->pwlArc->pts 	= vert;
+
+    if( isrational ) {
+        REAL pow_u[MAXORDER], pow_v[MAXORDER], pow_w[MAXORDER];
+    	trim_power_coeffs( bezierArc, pow_u, 0 );
+    	trim_power_coeffs( bezierArc, pow_v, 1 );
+        trim_power_coeffs( bezierArc, pow_w, 2 );
+
+	/* compute first point exactly */
+        REAL *b = bezierArc->cpts;
+	vert->param[0] = b[0]/b[2];
+	vert->param[1] = b[1]/b[2];
+
+	/* strength reduction on p = dp * step would introduce error */
+	int step;
+#ifndef NOELIMINATION
+	int ocanremove = 0;
+#endif
+    	register long order =  bezierArc->order;
+	for( step=1, ++vert; step<nsteps; step++, vert++ ) {
+	    register REAL p = dp * step;
+    	    register REAL u = pow_u[0];
+            register REAL v = pow_v[0];
+	    register REAL w = pow_w[0];
+	    for( register int i = 1; i < order; i++ ) {
+	        u = u * p + pow_u[i];
+	        v = v * p + pow_v[i];
+	        w = w * p + pow_w[i];
+            }
+            vert->param[0] = u/w;
+    	    vert->param[1] = v/w;
+#ifndef NOELIMINATION
+	    REAL ds = glu_abs(vert[0].param[0] - vert[-1].param[0]);
+	    REAL dt = glu_abs(vert[0].param[1] - vert[-1].param[1]);
+	    int canremove = (ds<geo_stepsize && dt<geo_stepsize) ? 1 : 0;
+	    REAL ods=0.0, odt=0.0;
+
+	    if( ocanremove && canremove ) {
+		REAL nds = ds + ods;
+		REAL ndt = dt + odt;
+		if( nds<geo_stepsize && ndt<geo_stepsize ) {
+		    // remove previous point
+		    --vert;
+		    vert[0].param[0] = vert[1].param[0];
+		    vert[0].param[1] = vert[1].param[1];
+		    ods = nds;
+		    odt = ndt;
+		    ocanremove = 1;
+		} else {
+		    ocanremove = canremove;
+		    ods = ds;
+		    odt = dt;
+		}
+	    } else {
+		ocanremove = canremove;
+		ods = ds;
+		odt = dt;
+	    }
+#endif	
+	}
+
+	/* compute last point exactly */
+	b += (order - 1) * bezierArc->stride;
+	vert->param[0] = b[0]/b[2];
+	vert->param[1] = b[1]/b[2];
+
+    } else {
+        REAL pow_u[MAXORDER], pow_v[MAXORDER];
+	trim_power_coeffs( bezierArc, pow_u, 0 );
+	trim_power_coeffs( bezierArc, pow_v, 1 );
+
+	/* compute first point exactly */
+        REAL *b = bezierArc->cpts;
+	vert->param[0] = b[0];
+	vert->param[1] = b[1];
+
+	/* strength reduction on p = dp * step would introduce error */
+	int step;
+#ifndef NOELIMINATION
+	int ocanremove = 0;
+#endif
+    	register long order =  bezierArc->order;
+	for( step=1, ++vert; step<nsteps; step++, vert++ ) {
+	    register REAL p = dp * step;
+	    register REAL u = pow_u[0];
+            register REAL v = pow_v[0];
+            for( register int i = 1; i < bezierArc->order; i++ ) {
+	        u = u * p + pow_u[i];
+	        v = v * p + pow_v[i];
+            }
+            vert->param[0] = u;
+	    vert->param[1] = v;
+#ifndef NOELIMINATION
+	    REAL ds = glu_abs(vert[0].param[0] - vert[-1].param[0]);
+	    REAL dt = glu_abs(vert[0].param[1] - vert[-1].param[1]);
+	    int canremove = (ds<geo_stepsize && dt<geo_stepsize) ? 1 : 0;
+	    REAL ods=0.0, odt=0.0;
+
+	    if( ocanremove && canremove ) {
+		REAL nds = ds + ods;
+		REAL ndt = dt + odt;
+		if( nds<geo_stepsize && ndt<geo_stepsize ) {
+		    // remove previous point
+		    --vert;
+		    vert[0].param[0] = vert[1].param[0];
+		    vert[0].param[1] = vert[1].param[1];
+		    ods = nds;
+		    odt = ndt;
+		    ocanremove = 1;
+		} else {
+		    ocanremove = canremove;
+		    ods = ds;
+		    odt = dt;
+		}
+	    } else {
+		ocanremove = canremove;
+		ods = ds;
+		odt = dt;
+	    }
+#endif	
+	}
+
+	/* compute last point exactly */
+	b += (order - 1) * bezierArc->stride;
+	vert->param[0] = b[0];
+	vert->param[1] = b[1];
+    }
+    arc->pwlArc->npts = vert - arc->pwlArc->pts + 1;
+/*
+    for( TrimVertex *vt=pwlArc->pts; vt != vert-1; vt++ ) {
+	if( tooclose( vt[0].param[0], vt[1].param[0] ) )
+	    vt[1].param[0] = vt[0].param[0];
+	if( tooclose( vt[0].param[1], vt[1].param[1] ) )
+	    vt[1].param[1] = vt[0].param[1];
+    }
+*/
+}
+
+const REAL ArcTessellator::gl_Bernstein[][MAXORDER][MAXORDER] = {
+ {
+  {1, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 }
+ },
+ {
+  {-1, 1, 0, 0, 0, 0, 0, 0 },
+  {1, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 }
+ },
+ {
+  {1, -2, 1, 0, 0, 0, 0, 0 },
+  {-2, 2, 0, 0, 0, 0, 0, 0 },
+  {1, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 }
+ },
+ {
+  {-1, 3, -3, 1, 0, 0, 0, 0 },
+  {3, -6, 3, 0, 0, 0, 0, 0 },
+  {-3, 3, 0, 0, 0, 0, 0, 0 },
+  {1, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 }
+ },
+ {
+  {1, -4, 6, -4, 1, 0, 0, 0 },
+  {-4, 12, -12, 4, 0, 0, 0, 0 },
+  {6, -12, 6, 0, 0, 0, 0, 0 },
+  {-4, 4, 0, 0, 0, 0, 0, 0 },
+  {1, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 }
+ },
+ {
+  {-1, 5, -10, 10, -5, 1, 0, 0 },
+  {5, -20, 30, -20, 5, 0, 0, 0 },
+  {-10, 30, -30, 10, 0, 0, 0, 0 },
+  {10, -20, 10, 0, 0, 0, 0, 0 },
+  {-5, 5, 0, 0, 0, 0, 0, 0 },
+  {1, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 }
+ },
+ {
+  {1, -6, 15, -20, 15, -6, 1, 0 },
+  {-6, 30, -60, 60, -30, 6, 0, 0 },
+  {15, -60, 90, -60, 15, 0, 0, 0 },
+  {-20, 60, -60, 20, 0, 0, 0, 0 },
+  {15, -30, 15, 0, 0, 0, 0, 0 },
+  {-6, 6, 0, 0, 0, 0, 0, 0 },
+  {1, 0, 0, 0, 0, 0, 0, 0 },
+  {0, 0, 0, 0, 0, 0, 0, 0 }
+ },
+ {
+  {-1, 7, -21, 35, -35, 21, -7, 1 },
+  {7, -42, 105, -140, 105, -42, 7, 0 },
+  {-21, 105, -210, 210, -105, 21, 0, 0 },
+  {35, -140, 210, -140, 35, 0, 0, 0 },
+  {-35, 105, -105, 35, 0, 0, 0, 0 },
+  {21, -42, 21, 0, 0, 0, 0, 0 },
+  {-7, 7, 0, 0, 0, 0, 0, 0 },
+  {1, 0, 0, 0, 0, 0, 0, 0 }
+ }};
+
+
+/*-----------------------------------------------------------------------------
+ * trim_power_coeffs - compute power basis coefficients from bezier coeffients
+ *-----------------------------------------------------------------------------
+ */
+void
+ArcTessellator::trim_power_coeffs( BezierArc *bez_arc, REAL *p, int coord )
+{
+    register int stride = bez_arc->stride;
+    register int order = bez_arc->order;
+    register REAL *base = bez_arc->cpts + coord;
+
+    REAL const (*mat)[MAXORDER][MAXORDER] = &gl_Bernstein[order-1];
+    REAL const (*lrow)[MAXORDER] = &(*mat)[order];
+
+    /* WIN32 didn't like the following line within the for-loop */
+    REAL const (*row)[MAXORDER] =  &(*mat)[0];
+    for( ; row != lrow; row++ ) {
+	register REAL s = 0.0;
+	register REAL *point = base;
+	register REAL const *mlast = *row + order;
+	for( REAL const *m = *row; m != mlast; m++, point += stride ) 
+	    s += *(m) * (*point);
+	*(p++) = s;
+    }
+}
diff --git a/src/glu/sgi/libnurbs/internals/arctess.h b/src/glu/sgi/libnurbs/internals/arctess.h
new file mode 100644
index 00000000000..2399f29419c
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/arctess.h
@@ -0,0 +1,72 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * arctess.h
+ *
+ * $Date: 2001/08/07 17:34:11 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/arctess.h,v 1.2 2001/08/07 17:34:11 brianp Exp $
+ */
+
+#ifndef __gluarctess_h_
+#define __gluarctess_h_
+
+#include "defines.h"
+#include "types.h"
+#include "arc.h"
+
+struct BezierArc;
+class Pool;
+class TrimVertexPool;
+
+class ArcTessellator {
+public:
+			ArcTessellator( TrimVertexPool&, Pool& );
+			~ArcTessellator( void );
+    void		bezier( Arc_ptr, REAL, REAL, REAL, REAL );
+    void		pwl( Arc_ptr, REAL, REAL, REAL, REAL, REAL );
+    void		pwl_left( Arc_ptr, REAL, REAL, REAL, REAL );
+    void		pwl_right( Arc_ptr, REAL, REAL, REAL, REAL );
+    void		pwl_top( Arc_ptr, REAL, REAL, REAL, REAL );
+    void		pwl_bottom( Arc_ptr, REAL, REAL, REAL, REAL );
+    void		tessellateLinear( Arc_ptr, REAL, REAL, int );
+    void		tessellateNonlinear( Arc_ptr, REAL, REAL, int );
+private:
+    static const REAL 	gl_Bernstein[][MAXORDER][MAXORDER];
+    Pool&		pwlarcpool;
+    TrimVertexPool&	trimvertexpool;
+    static void		trim_power_coeffs( BezierArc *, REAL[MAXORDER], int );
+};
+
+#endif /* __gluarctess_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/backend.cc b/src/glu/sgi/libnurbs/internals/backend.cc
new file mode 100644
index 00000000000..fdb3578ab8d
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/backend.cc
@@ -0,0 +1,591 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * backend.c++
+ *
+ * $Date: 2004/05/12 15:29:36 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/backend.cc,v 1.2 2004/05/12 15:29:36 brianp Exp $
+ */
+
+/* Bezier surface backend
+	- interprets display mode (wireframe,shaded,...)
+*/
+#include <stdio.h>
+#include "glimports.h"
+#include "mystdio.h"
+#include "backend.h"
+#include "basiccrveval.h"
+#include "basicsurfeval.h"
+#include "nurbsconsts.h"
+
+#define NOWIREFRAME
+
+
+/*-------------------------------------------------------------------------
+ * bgnsurf - preamble to surface definition and evaluations
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::bgnsurf( int wiretris, int wirequads, long nuid )
+{
+/*#ifndef NOWIREFRAME*/ //need this for old version
+    wireframetris = wiretris;
+    wireframequads = wirequads;
+/*#endif*/
+
+    /*in the spec, GLU_DISPLAY_MODE is either
+     * GLU_FILL
+     * GLU_OUTLINE_POLY
+     * GLU_OUTLINE_PATCH.
+     *In fact, GLU_FLL is has the same effect as
+     * set GL_FRONT_AND_BACK to be GL_FILL
+     * and GLU_OUTLINE_POLY is the same as set 
+     *     GL_FRONT_AND_BACK to be GL_LINE
+     *It is more efficient to do this once at the beginning of
+     *each surface than to do it for each primitive.
+     *   The internal has more options: outline_triangle and outline_quad
+     *can be seperated. But since this is not in spec, and more importantly,
+     *this is not so useful, so we don't need to keep this option.
+     */
+
+    surfaceEvaluator.bgnmap2f( nuid );
+
+    if(wiretris)
+      surfaceEvaluator.polymode(N_MESHLINE);
+    else
+      surfaceEvaluator.polymode(N_MESHFILL);
+}
+
+void
+Backend::patch( REAL ulo, REAL uhi, REAL vlo, REAL vhi )
+{
+    surfaceEvaluator.domain2f( ulo, uhi, vlo, vhi );
+}
+
+void
+Backend::surfbbox( long type, REAL *from, REAL *to )
+{
+    surfaceEvaluator.range2f( type, from, to );
+}
+
+/*-------------------------------------------------------------------------
+ * surfpts - pass a desription of a surface map
+ *-------------------------------------------------------------------------
+ */
+void 
+Backend::surfpts(
+    long type, 		/* geometry, color, texture, normal	*/
+    REAL *pts, 		/* control points			*/
+    long ustride,	/* distance to next point in u direction */
+    long vstride,	/* distance to next point in v direction */
+    int uorder,	/* u parametric order			*/
+    int vorder,	/* v parametric order			*/
+    REAL ulo,		/* u lower bound			*/
+    REAL uhi,		/* u upper bound			*/
+    REAL vlo,		/* v lower bound			*/
+    REAL vhi )		/* v upper bound			*/
+{
+    surfaceEvaluator.map2f( type,ulo,uhi,ustride,uorder,vlo,vhi,vstride,vorder,pts );
+    surfaceEvaluator.enable( type );
+}
+
+/*-------------------------------------------------------------------------
+ * surfgrid - define a lattice of points with origin and offset
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::surfgrid( REAL u0, REAL u1, long nu, REAL v0, REAL v1, long nv )
+{
+    surfaceEvaluator.mapgrid2f( nu, u0, u1, nv, v0, v1 );
+}
+
+/*-------------------------------------------------------------------------
+ * surfmesh - evaluate a mesh of points on lattice
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::surfmesh( long u, long v, long n, long m )
+{
+#ifndef NOWIREFRAME
+    if( wireframequads ) {
+	long v0,  v1;
+	long u0f = u, u1f = u+n;
+	long v0f = v, v1f = v+m;
+	long parity = (u & 1);
+
+        for( v0 = v0f, v1 = v0f++ ; v0<v1f; v0 = v1, v1++ ) {
+	    surfaceEvaluator.bgnline();
+	    for( long u = u0f; u<=u1f; u++ ) {
+		if( parity ) {
+		    surfaceEvaluator.evalpoint2i( u, v0 );
+		    surfaceEvaluator.evalpoint2i( u, v1 );
+		} else {
+		    surfaceEvaluator.evalpoint2i( u, v1 );
+		    surfaceEvaluator.evalpoint2i( u, v0 );
+		}
+		parity = 1 - parity;
+	    }
+	    surfaceEvaluator.endline();
+	}
+    } else {
+	surfaceEvaluator.mapmesh2f( N_MESHFILL, u, u+n, v, v+m );
+    }
+#else
+    if( wireframequads ) {
+
+	surfaceEvaluator.mapmesh2f( N_MESHLINE, u, u+n, v, v+m );
+    } else {
+
+	surfaceEvaluator.mapmesh2f( N_MESHFILL, u, u+n, v, v+m );
+    }
+#endif
+}
+
+/*-------------------------------------------------------------------------
+ * endsurf - postamble to surface
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::endsurf( void )
+{
+    surfaceEvaluator.endmap2f();
+}
+
+/***************************************/
+void
+Backend::bgntfan( void )
+{
+  surfaceEvaluator.bgntfan();
+/*
+  if(wireframetris)	
+    surfaceEvaluator.polymode( N_MESHLINE );
+  else
+    surfaceEvaluator.polymode( N_MESHFILL );
+*/
+}
+
+void
+Backend::endtfan( void )
+{
+   surfaceEvaluator.endtfan();
+}
+
+void
+Backend::bgnqstrip( void )
+{
+   surfaceEvaluator.bgnqstrip();
+/*
+  if(wireframequads)
+    surfaceEvaluator.polymode( N_MESHLINE );
+  else
+    surfaceEvaluator.polymode( N_MESHFILL );    
+*/
+}
+
+void
+Backend::endqstrip( void )
+{
+   surfaceEvaluator.endqstrip();
+}
+
+void
+Backend::evalUStrip(int n_upper, REAL v_upper, REAL* upper_val,
+                       int n_lower, REAL v_lower, REAL* lower_val
+                       )
+{
+	surfaceEvaluator.evalUStrip(n_upper, v_upper, upper_val, 
+				      n_lower, v_lower, lower_val);
+}
+
+void 
+Backend::evalVStrip(int n_left, REAL u_left, REAL* left_val, 
+		    int n_right, REAL u_right, REAL* right_val
+		    )
+{
+  surfaceEvaluator.evalVStrip(n_left, u_left, left_val,
+				n_right, u_right, right_val);
+}
+
+/***************************************/
+   
+
+/*-------------------------------------------------------------------------
+ * bgntmesh - preamble to a triangle mesh
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::bgntmesh( char * )		
+{
+#ifndef NOWIREFRAME
+
+    meshindex = 0;	/* I think these need to be initialized to zero */
+    npts = 0;
+
+    if( !wireframetris ) {
+        surfaceEvaluator.bgntmesh();
+    }
+#else
+
+    if( wireframetris ) {
+        surfaceEvaluator.bgntmesh();
+	surfaceEvaluator.polymode( N_MESHLINE );
+    } else {
+        surfaceEvaluator.bgntmesh();
+	surfaceEvaluator.polymode( N_MESHFILL );
+    }
+#endif
+}
+
+void
+Backend::tmeshvert( GridTrimVertex *v )
+{
+    if( v->isGridVert() ) {
+	tmeshvert( v->g );
+    } else {
+	tmeshvert( v->t );
+    }
+}
+
+void
+Backend::tmeshvertNOGE(TrimVertex *t)
+{
+//	surfaceEvaluator.inDoEvalCoord2NOGE( t->param[0], t->param[1], temp, ttt);
+#ifdef USE_OPTTT
+	surfaceEvaluator.inDoEvalCoord2NOGE( t->param[0], t->param[1], t->cache_point, t->cache_normal);    
+#endif
+}
+
+//opt for a line with the same u.
+void
+Backend::tmeshvertNOGE_BU(TrimVertex *t)
+{
+#ifdef USE_OPTTT
+	surfaceEvaluator.inDoEvalCoord2NOGE_BU( t->param[0], t->param[1], t->cache_point, t->cache_normal);    
+#endif
+}
+
+//opt for a line with the same v.
+void
+Backend::tmeshvertNOGE_BV(TrimVertex *t)
+{
+#ifdef USE_OPTTT
+	surfaceEvaluator.inDoEvalCoord2NOGE_BV( t->param[0], t->param[1], t->cache_point, t->cache_normal);    
+#endif
+}
+
+void
+Backend::preEvaluateBU(REAL u)
+{
+	surfaceEvaluator.inPreEvaluateBU_intfac(u);
+}
+
+void 
+Backend::preEvaluateBV(REAL v)
+{
+	surfaceEvaluator.inPreEvaluateBV_intfac(v);
+}
+
+
+/*-------------------------------------------------------------------------
+ * tmeshvert - evaluate a point on a triangle mesh
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::tmeshvert( TrimVertex *t )
+{
+
+#ifndef NOWIREFRAME
+    const long nuid = t->nuid;
+#endif
+    const REAL u = t->param[0];
+    const REAL v = t->param[1];
+
+#ifndef NOWIREFRAME
+    npts++;
+    if( wireframetris ) {
+	if( npts >= 3 ) {
+	    surfaceEvaluator.bgnclosedline();
+	    if( mesh[0][2] == 0 )
+		surfaceEvaluator.evalcoord2f( mesh[0][3], mesh[0][0], mesh[0][1] );
+	    else
+		surfaceEvaluator.evalpoint2i( (long) mesh[0][0], (long) mesh[0][1] );
+	    if( mesh[1][2] == 0 )
+		surfaceEvaluator.evalcoord2f( mesh[1][3], mesh[1][0], mesh[1][1] );
+	    else
+		surfaceEvaluator.evalpoint2i( (long) mesh[1][0], (long) mesh[1][1] );
+	    surfaceEvaluator.evalcoord2f( nuid, u, v );
+	    surfaceEvaluator.endclosedline();
+	}
+        mesh[meshindex][0] = u;
+        mesh[meshindex][1] = v;
+	mesh[meshindex][2] = 0;
+	mesh[meshindex][3] = nuid;
+        meshindex = (meshindex+1) % 2;
+    } else {
+	surfaceEvaluator.evalcoord2f( nuid, u, v );
+    }
+#else
+          
+          surfaceEvaluator.evalcoord2f( 0, u, v );
+//for uninitial memory read          surfaceEvaluator.evalcoord2f( nuid, u, v );
+#endif
+}
+
+//the same as tmeshvert(trimvertex), for efficiency purpose
+void
+Backend::tmeshvert( REAL u, REAL v )
+{
+#ifndef NOWIREFRAME
+    const long nuid = 0;
+    
+    npts++;
+    if( wireframetris ) {
+	if( npts >= 3 ) {
+	    surfaceEvaluator.bgnclosedline();
+	    if( mesh[0][2] == 0 )
+		surfaceEvaluator.evalcoord2f( mesh[0][3], mesh[0][0], mesh[0][1] );
+	    else
+		surfaceEvaluator.evalpoint2i( (long) mesh[0][0], (long) mesh[0][1] );
+	    if( mesh[1][2] == 0 )
+		surfaceEvaluator.evalcoord2f( mesh[1][3], mesh[1][0], mesh[1][1] );
+	    else
+		surfaceEvaluator.evalpoint2i( (long) mesh[1][0], (long) mesh[1][1] );
+	    surfaceEvaluator.evalcoord2f( nuid, u, v );
+	    surfaceEvaluator.endclosedline();
+	}
+        mesh[meshindex][0] = u;
+        mesh[meshindex][1] = v;
+	mesh[meshindex][2] = 0;
+	mesh[meshindex][3] = nuid;
+        meshindex = (meshindex+1) % 2;
+    } else {
+	surfaceEvaluator.evalcoord2f( nuid, u, v );
+    }
+#else
+          
+          surfaceEvaluator.evalcoord2f( 0, u, v );
+#endif
+}
+
+/*-------------------------------------------------------------------------
+ * tmeshvert - evaluate a grid point of a triangle mesh
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::tmeshvert( GridVertex *g )
+{
+    const long u = g->gparam[0];
+    const long v = g->gparam[1];
+
+#ifndef NOWIREFRAME
+    npts++;
+    if( wireframetris ) {
+	if( npts >= 3 ) {
+	    surfaceEvaluator.bgnclosedline();
+	    if( mesh[0][2] == 0 )
+		surfaceEvaluator.evalcoord2f( (long) mesh[0][3], mesh[0][0], mesh[0][1] );
+	    else
+		surfaceEvaluator.evalpoint2i( (long) mesh[0][0], (long) mesh[0][1] );
+	    if( mesh[1][2] == 0 )
+		surfaceEvaluator.evalcoord2f( (long) mesh[1][3], mesh[1][0], mesh[1][1] );
+	    else
+		surfaceEvaluator.evalpoint2i( (long) mesh[1][0], (long) mesh[1][1] );
+	    surfaceEvaluator.evalpoint2i( u, v );
+	    surfaceEvaluator.endclosedline();
+	}
+        mesh[meshindex][0] = u;
+        mesh[meshindex][1] = v;
+	mesh[meshindex][2] = 1;
+        meshindex = (meshindex+1) % 2;
+    } else {
+        surfaceEvaluator.evalpoint2i( u, v );
+    }
+#else
+    surfaceEvaluator.evalpoint2i( u, v );
+#endif
+}
+
+/*-------------------------------------------------------------------------
+ * swaptmesh - perform a swap of the triangle mesh pointers
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::swaptmesh( void )
+{
+#ifndef NOWIREFRAME
+    if( wireframetris ) {
+        meshindex = 1 - meshindex;
+    } else {
+	surfaceEvaluator.swaptmesh();
+    }
+#else
+    surfaceEvaluator.swaptmesh();
+#endif
+}
+
+/*-------------------------------------------------------------------------
+ * endtmesh - postamble to triangle mesh
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::endtmesh( void )
+{
+#ifndef NOWIREFRAME
+    if( ! wireframetris )
+        surfaceEvaluator.endtmesh();
+#else
+    surfaceEvaluator.endtmesh();
+/*    surfaceEvaluator.polymode( N_MESHFILL );*/
+#endif
+}
+
+
+/*-------------------------------------------------------------------------
+ * bgnoutline - preamble to outlined rendering
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::bgnoutline( void )
+{
+    surfaceEvaluator.bgnline();
+}
+
+/*-------------------------------------------------------------------------
+ * linevert - evaluate a point on an outlined contour
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::linevert( TrimVertex *t )
+{
+    surfaceEvaluator.evalcoord2f( t->nuid, t->param[0], t->param[1] );
+}
+
+/*-------------------------------------------------------------------------
+ * linevert - evaluate a grid point of an outlined contour
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::linevert( GridVertex *g )
+{
+    surfaceEvaluator.evalpoint2i( g->gparam[0], g->gparam[1] );
+}
+
+/*-------------------------------------------------------------------------
+ * endoutline - postamble to outlined rendering
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::endoutline( void )
+{
+    surfaceEvaluator.endline();
+}
+
+/*-------------------------------------------------------------------------
+ * triangle - output a triangle 
+ *-------------------------------------------------------------------------
+ */
+void
+Backend::triangle( TrimVertex *a, TrimVertex *b, TrimVertex *c )
+{
+/*    bgntmesh( "spittriangle" );*/
+    bgntfan();
+    tmeshvert( a );
+    tmeshvert( b );
+    tmeshvert( c );
+    endtfan();
+/*    endtmesh();*/
+}
+
+void 
+Backend::bgncurv( void )
+{
+    curveEvaluator.bgnmap1f( 0 );
+}
+
+void
+Backend::segment( REAL ulo, REAL uhi )
+{
+    curveEvaluator.domain1f( ulo, uhi );
+} 
+
+void 
+Backend::curvpts( 
+    long type,		 	/* geometry, color, texture, normal */
+    REAL *pts, 			/* control points */
+    long stride, 		/* distance to next point */
+    int order,			/* parametric order */
+    REAL ulo,			/* lower parametric bound */
+    REAL uhi )			/* upper parametric bound */
+
+{
+    curveEvaluator.map1f( type, ulo, uhi, stride, order, pts );
+    curveEvaluator.enable( type );
+}
+
+void 
+Backend::curvgrid( REAL u0, REAL u1, long nu )
+{
+    curveEvaluator.mapgrid1f( nu, u0, u1 );
+}
+
+void 
+Backend::curvmesh( long from, long n )
+{
+    curveEvaluator.mapmesh1f( N_MESHFILL, from, from+n );
+}
+
+void 
+Backend::curvpt(REAL u)
+{
+    curveEvaluator.evalcoord1f( 0, u );
+}
+
+void 
+Backend::bgnline( void )		
+{
+    curveEvaluator.bgnline();
+}
+
+void 
+Backend::endline( void )
+{
+    curveEvaluator.endline();
+}
+
+void 
+Backend::endcurv( void )
+{
+    curveEvaluator.endmap1f();
+}
diff --git a/src/glu/sgi/libnurbs/internals/backend.h b/src/glu/sgi/libnurbs/internals/backend.h
new file mode 100644
index 00000000000..d27a05bdcc1
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/backend.h
@@ -0,0 +1,119 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * backend.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/backend.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __glubackend_h_
+#define __glubackend_h_
+
+#include "trimvertex.h"
+#include "gridvertex.h"
+#include "gridtrimvertex.h"
+
+class BasicCurveEvaluator;
+class BasicSurfaceEvaluator;
+
+class Backend {
+private:
+    BasicCurveEvaluator&	curveEvaluator;
+    BasicSurfaceEvaluator&	surfaceEvaluator;
+public:
+  			Backend( BasicCurveEvaluator &c, BasicSurfaceEvaluator& e )
+			: curveEvaluator(c), surfaceEvaluator(e) {}
+
+    /* surface backend routines */
+    void		bgnsurf( int, int, long  );
+    void		patch( REAL, REAL, REAL, REAL );
+    void		surfpts( long, REAL *, long, long, int, int,
+          			 REAL, REAL, REAL, REAL );
+    void		surfbbox( long, REAL *, REAL * );
+    void		surfgrid( REAL, REAL, long, REAL, REAL, long ); 
+    void		surfmesh( long, long, long, long ); 
+    void		bgntmesh( char * );
+    void		endtmesh( void );
+    void		swaptmesh( void );
+    void		tmeshvert( GridTrimVertex * );
+    void		tmeshvert( TrimVertex * );
+    void		tmeshvert( GridVertex * );
+    void		tmeshvert( REAL u,  REAL v );
+    void		linevert( TrimVertex * );
+    void		linevert( GridVertex * );
+    void		bgnoutline( void );
+    void		endoutline( void );
+    void		endsurf( void );
+    void		triangle( TrimVertex*, TrimVertex*, TrimVertex* );
+
+    void                bgntfan();
+    void                endtfan();
+    void                bgnqstrip();
+    void                endqstrip();
+    void                evalUStrip(int n_upper, REAL v_upper, REAL* upper_val, 
+				   int n_lower, REAL v_lower, REAL* lower_val
+				   );
+    void                evalVStrip(int n_left, REAL u_left, REAL* left_val, 
+				   int n_right, REAL v_right, REAL* right_val
+				   );
+    void                tmeshvertNOGE(TrimVertex *t);
+    void                tmeshvertNOGE_BU(TrimVertex *t);
+    void                tmeshvertNOGE_BV(TrimVertex *t);
+    void                preEvaluateBU(REAL u);
+    void                preEvaluateBV(REAL v);
+	
+
+    /* curve backend routines */
+    void		bgncurv( void );
+    void		segment( REAL, REAL );
+    void		curvpts( long, REAL *, long, int, REAL, REAL );
+    void		curvgrid( REAL, REAL, long );
+    void		curvmesh( long, long );
+    void		curvpt( REAL  );  
+    void		bgnline( void );
+    void		endline( void );
+    void		endcurv( void );
+private:
+#ifndef NOWIREFRAME
+    int			wireframetris;
+    int			wireframequads;
+    int			npts;
+    REAL		mesh[3][4];
+    int			meshindex;
+#endif
+};
+
+#endif /* __glubackend_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/basiccrveval.cc b/src/glu/sgi/libnurbs/internals/basiccrveval.cc
new file mode 100644
index 00000000000..c7e4282360b
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/basiccrveval.cc
@@ -0,0 +1,138 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * basiccrveval.c++
+ *
+ */
+
+#include "mystdio.h"
+#include "types.h"
+#include "basiccrveval.h"
+
+void
+BasicCurveEvaluator::domain1f( REAL, REAL )
+{
+#ifndef NDEBUG
+    dprintf( "domain1f\n" );
+#endif
+}
+
+void
+BasicCurveEvaluator::range1f( long , REAL *, REAL * )
+{
+#ifndef NDEBUG
+    dprintf( "range1f\n" );
+#endif
+}
+
+void
+BasicCurveEvaluator::enable( long )
+{
+#ifndef NDEBUG
+    dprintf( "enable\n" );
+#endif
+}
+
+void
+BasicCurveEvaluator::disable( long )
+{
+#ifndef NDEBUG
+    dprintf( "disable\n" );
+#endif
+}
+
+void
+BasicCurveEvaluator::bgnmap1f( long )
+{
+#ifndef NDEBUG
+    dprintf( "bgnmap1f\n" );
+#endif
+}
+
+void
+BasicCurveEvaluator::map1f( long, REAL, REAL, long, long, REAL * )
+{
+#ifndef NDEBUG
+    dprintf( "map1f\n" );
+#endif
+}
+
+void
+BasicCurveEvaluator::mapgrid1f( long, REAL, REAL )
+{
+#ifndef NDEBUG
+    dprintf( "mapgrid1f\n" );
+#endif
+}
+
+void
+BasicCurveEvaluator::mapmesh1f( long, long, long )
+{
+#ifndef NDEBUG
+    dprintf( "mapmesh1f\n" );
+#endif
+}
+
+void
+BasicCurveEvaluator::evalcoord1f( long, REAL )
+{
+#ifndef NDEBUG
+    dprintf( "evalcoord1f\n" );
+#endif
+}
+
+void
+BasicCurveEvaluator::endmap1f( void )
+{
+#ifndef NDEBUG
+    dprintf( "endmap1f\n" );
+#endif
+}
+
+void
+BasicCurveEvaluator::bgnline( void )
+{
+#ifndef NDEBUG
+    dprintf( "bgnline\n" );
+#endif
+}
+
+void
+BasicCurveEvaluator::endline( void )
+{
+#ifndef NDEBUG
+    dprintf( "endline\n" );
+#endif
+}
diff --git a/src/glu/sgi/libnurbs/internals/basiccrveval.h b/src/glu/sgi/libnurbs/internals/basiccrveval.h
new file mode 100644
index 00000000000..23a3ae9fdf5
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/basiccrveval.h
@@ -0,0 +1,67 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * basiccurveeval.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/basiccrveval.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __glubasiccrveval_h_
+#define __glubasiccrveval_h_
+
+#include "types.h"
+#include "displaymode.h"
+#include "cachingeval.h"
+
+class BasicCurveEvaluator : public CachingEvaluator {
+public:
+    virtual void	domain1f( REAL, REAL );
+    virtual void	range1f( long, REAL *, REAL * );
+
+    virtual void	enable( long );
+    virtual void	disable( long );
+    virtual void	bgnmap1f( long );
+    virtual void	map1f( long, REAL, REAL, long, long, REAL * );
+    virtual void	mapgrid1f( long, REAL, REAL );
+    virtual void	mapmesh1f( long, long, long );
+    virtual void	evalcoord1f( long, REAL );
+    virtual void	endmap1f( void );
+
+    virtual void	bgnline( void );
+    virtual void	endline( void );
+};
+
+#endif /* __glubasiccrveval_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/basicsurfeval.cc b/src/glu/sgi/libnurbs/internals/basicsurfeval.cc
new file mode 100644
index 00000000000..ff212bf0b4b
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/basicsurfeval.cc
@@ -0,0 +1,232 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * basicsurfaceevaluator.c++
+ *
+ */
+
+#include "mystdio.h"
+#include "types.h"
+#include "basicsurfeval.h"
+
+#ifdef __WATCOMC__
+#pragma warning 726 10
+#endif
+
+void
+BasicSurfaceEvaluator::domain2f( REAL, REAL, REAL, REAL )
+{
+#ifndef NDEBUG
+    dprintf( "domain2f\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::polymode( long )
+{
+#ifndef NDEBUG
+    dprintf( "polymode\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::range2f( long type, REAL *from, REAL *to )
+{
+#ifndef NDEBUG
+    dprintf( "range2f type %ld, from (%g,%g), to (%g,%g)\n",
+		type, from[0], from[1], to[0], to[1] );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::enable( long )
+{
+#ifndef NDEBUG
+    dprintf( "enable\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::disable( long )
+{
+#ifndef NDEBUG
+    dprintf( "disable\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::bgnmap2f( long )
+{
+#ifndef NDEBUG
+    dprintf( "bgnmap2f\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::endmap2f( void )
+{
+#ifndef NDEBUG
+    dprintf( "endmap2f\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::map2f( long, REAL, REAL, long, long,
+				    REAL, REAL, long, long,
+			      REAL * )
+{
+#ifndef NDEBUG
+    dprintf( "map2f\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::mapgrid2f( long, REAL, REAL, long, REAL, REAL )
+{
+#ifndef NDEBUG
+    dprintf( "mapgrid2f\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::mapmesh2f( long, long, long, long, long )
+{
+#ifndef NDEBUG
+    dprintf( "mapmesh2f\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::evalcoord2f( long, REAL, REAL )
+{
+#ifndef NDEBUG
+    dprintf( "evalcoord2f\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::evalpoint2i( long, long )
+{
+#ifndef NDEBUG
+    dprintf( "evalpoint2i\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::bgnline( void )
+{
+#ifndef NDEBUG
+    dprintf( "bgnline\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::endline( void )
+{
+#ifndef NDEBUG
+    dprintf( "endline\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::bgnclosedline( void )
+{
+#ifndef NDEBUG
+    dprintf( "bgnclosedline\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::endclosedline( void )
+{
+#ifndef NDEBUG
+    dprintf( "endclosedline\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::bgntfan( void )
+{
+#ifndef NDEBUG
+    dprintf( "bgntfan\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::endtfan( void )
+{
+}
+
+
+void
+BasicSurfaceEvaluator::bgntmesh( void )
+{
+#ifndef NDEBUG
+    dprintf( "bgntmesh\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::swaptmesh( void )
+{
+#ifndef NDEBUG
+    dprintf( "swaptmesh\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::endtmesh( void )
+{
+#ifndef NDEBUG
+    dprintf( "endtmesh\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::bgnqstrip( void )
+{
+#ifndef NDEBUG
+    dprintf( "bgnqstrip\n" );
+#endif
+}
+
+void
+BasicSurfaceEvaluator::endqstrip( void )
+{
+#ifndef NDEBUG
+    dprintf( "endqstrip\n" );
+#endif
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/basicsurfeval.h b/src/glu/sgi/libnurbs/internals/basicsurfeval.h
new file mode 100644
index 00000000000..e47b46daaea
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/basicsurfeval.h
@@ -0,0 +1,95 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * basicsurfeval.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/basicsurfeval.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __glubasicsurfeval_h_
+#define __glubasicsurfeval_h_
+
+#include "types.h"
+#include "displaymode.h"
+#include "cachingeval.h"
+
+class BasicSurfaceEvaluator : public CachingEvaluator {
+public:
+    virtual void	range2f( long, REAL *, REAL * );
+    virtual void	domain2f( REAL, REAL, REAL, REAL );
+
+    virtual void	enable( long );
+    virtual void	disable( long );
+    virtual void	bgnmap2f( long );
+    virtual void	map2f( long, REAL, REAL, long, long, 
+				     REAL, REAL, long, long, 
+				     REAL *  );
+    virtual void	mapgrid2f( long, REAL, REAL, long,  REAL, REAL );
+    virtual void	mapmesh2f( long, long, long, long, long );
+    virtual void	evalcoord2f( long, REAL, REAL );
+    virtual void	evalpoint2i( long, long );
+    virtual void	endmap2f( void );
+
+    virtual void	polymode( long );
+    virtual void 	bgnline( void );
+    virtual void 	endline( void );
+    virtual void 	bgnclosedline( void );
+    virtual void 	endclosedline( void );
+    virtual void 	bgntmesh( void );
+    virtual void 	swaptmesh( void );
+    virtual void 	endtmesh( void );
+    virtual void 	bgnqstrip( void );
+    virtual void 	endqstrip( void );
+
+    virtual void 	bgntfan( void );
+    virtual void 	endtfan( void );
+
+    virtual void        evalUStrip(int n_upper, REAL v_upper, REAL* upper_val,
+				     int n_lower, REAL v_lower, REAL* lower_val
+      ) = 0;
+
+    virtual void        evalVStrip(int n_left, REAL u_left, REAL* left_val,
+				     int n_right, REAL u_right, REAL* right_val
+      ) = 0;
+    virtual void        inDoEvalCoord2NOGE(REAL u, REAL v, REAL* ret_point, REAL* ret_normal) = 0;
+    virtual void        inDoEvalCoord2NOGE_BU(REAL u, REAL v, REAL* ret_point, REAL* ret_normal) = 0;
+    virtual void        inDoEvalCoord2NOGE_BV(REAL u, REAL v, REAL* ret_point, REAL* ret_normal) = 0;
+    virtual void inPreEvaluateBV_intfac(REAL v ) = 0;
+    virtual void inPreEvaluateBU_intfac(REAL u ) = 0;
+    
+};
+
+#endif /* __glubasicsurfeval_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/bezierarc.h b/src/glu/sgi/libnurbs/internals/bezierarc.h
new file mode 100644
index 00000000000..3942f1321ff
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/bezierarc.h
@@ -0,0 +1,57 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * bezierarc.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/bezierarc.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __glubezierarc_h
+#define __glubezierarc_h
+
+#include "myassert.h"
+
+class Mapdesc;
+
+struct BezierArc : public PooledObj { /* a bezier arc */
+    REAL *		cpts;		/* control points of arc */
+    int			order;		/* order of arc */
+    int			stride;		/* REAL distance between points */
+    long		type;		/* curve type */
+    Mapdesc *		mapdesc;
+};
+
+#endif /* __glubezierarc_h */
diff --git a/src/glu/sgi/libnurbs/internals/bin.cc b/src/glu/sgi/libnurbs/internals/bin.cc
new file mode 100644
index 00000000000..6fa296e1cbb
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/bin.cc
@@ -0,0 +1,168 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * bin.c++
+ *
+ * $Date: 2004/05/12 15:29:36 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/bin.cc,v 1.2 2004/05/12 15:29:36 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "bin.h"
+
+/*----------------------------------------------------------------------------
+ * Constructor and destructor
+ *----------------------------------------------------------------------------
+ */
+Bin::Bin()
+{
+    head = NULL;
+}
+
+Bin::~Bin()
+{
+    assert( head == NULL);
+}
+
+/*----------------------------------------------------------------------------
+ * remove_this_arc - remove given Arc_ptr from bin
+ *----------------------------------------------------------------------------
+ */
+
+void 
+Bin::remove_this_arc( Arc_ptr arc )
+{
+    Arc_ptr *j;
+    for( j = &(head); (*j != 0) && (*j != arc); j = &((*j)->link) );
+
+    if( *j != 0 ) {
+        if( *j == current )
+	    current = (*j)->link;
+	*j = (*j)->link;
+    }
+}
+
+/*----------------------------------------------------------------------------
+ * numarcs - count number of arcs in bin
+ *----------------------------------------------------------------------------
+ */
+
+int
+Bin::numarcs()
+{
+    long count = 0;
+    for( Arc_ptr jarc = firstarc(); jarc; jarc = nextarc() )
+	count++;
+    return count;
+}
+
+/*----------------------------------------------------------------------------
+ * adopt - place an orphaned arcs into their new parents bin
+ *----------------------------------------------------------------------------
+ */
+
+void 
+Bin::adopt()
+{
+    markall();
+
+    Arc_ptr orphan;
+    while( (orphan = removearc()) != NULL ) {
+	for( Arc_ptr parent = orphan->next; parent != orphan; parent = parent->next ) {
+	    if (! parent->ismarked() ) {
+		orphan->link = parent->link;
+		parent->link = orphan;
+		orphan->clearmark();
+		break;
+	    }
+	}
+    }
+}
+
+
+/*----------------------------------------------------------------------------
+ * show - print out descriptions of the arcs in the bin
+ *----------------------------------------------------------------------------
+ */
+
+void
+Bin::show( char *name )
+{
+#ifndef NDEBUG
+    dprintf( "%s\n", name );
+    for( Arc_ptr jarc = firstarc(); jarc; jarc = nextarc() )
+        jarc->show( );
+#endif
+}
+
+
+
+/*----------------------------------------------------------------------------
+ * markall - mark all arcs with an identifying tag
+ *----------------------------------------------------------------------------
+ */
+
+void 
+Bin::markall()
+{
+    for( Arc_ptr jarc=firstarc(); jarc; jarc=nextarc() )
+	jarc->setmark();
+}
+
+/*----------------------------------------------------------------------------
+ * listBezier - print out all arcs that are untessellated border arcs
+ *----------------------------------------------------------------------------
+ */
+
+void 
+Bin::listBezier( void )
+{
+    for( Arc_ptr jarc=firstarc(); jarc; jarc=nextarc() ) {
+	if( jarc->isbezier( ) ) {
+    	    assert( jarc->pwlArc->npts == 2 );	
+#ifndef NDEBUG
+	    TrimVertex  *pts = jarc->pwlArc->pts;
+    	    REAL s1 = pts[0].param[0];
+    	    REAL t1 = pts[0].param[1];
+    	    REAL s2 = pts[1].param[0];
+    	    REAL t2 = pts[1].param[1];
+	   dprintf( "arc (%g,%g) (%g,%g)\n", s1, t1, s2, t2 );
+#endif
+	}
+    }
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/bin.h b/src/glu/sgi/libnurbs/internals/bin.h
new file mode 100644
index 00000000000..f12b6212088
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/bin.h
@@ -0,0 +1,127 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * bin.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/bin.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __glubin_h_
+#define __glubin_h_
+
+#include "myassert.h"
+#include "arc.h"
+#include "defines.h"
+
+class Bin 
+{ /* a linked list of jordan arcs */
+private:
+    Arc_ptr head;/*first arc on list */
+    Arc_ptr		current;	/* current arc on list */
+public:
+    			Bin();
+			~Bin();
+    inline Arc_ptr	firstarc( void );
+    inline Arc_ptr	nextarc( void );
+    inline Arc_ptr	removearc( void );
+    inline int		isnonempty( void ) { return (head ? 1 : 0); }
+    inline void		addarc( Arc_ptr );
+    void 		remove_this_arc( Arc_ptr );
+    int			numarcs( void );
+    void 		adopt( void );
+    void		markall( void );
+    void		show( char * );
+    void		listBezier( void );
+};
+
+/*----------------------------------------------------------------------------
+ * Bin::addarc - add an Arc_ptr to head of linked list of Arc_ptr
+ *----------------------------------------------------------------------------
+ */
+
+inline void
+Bin::addarc( Arc_ptr jarc )
+{
+   jarc->link = head;
+   head = jarc;
+}
+
+/*----------------------------------------------------------------------------
+ * Bin::removearc - remove first Arc_ptr from bin
+ *----------------------------------------------------------------------------
+ */
+
+inline Arc_ptr
+Bin::removearc( void )
+{
+    Arc_ptr jarc = head;
+
+    if( jarc ) head = jarc->link;
+    return jarc;
+}
+
+
+/*----------------------------------------------------------------------------
+ * BinIter::nextarc - return current arc in bin and advance pointer to next arc
+ *----------------------------------------------------------------------------
+ */
+
+inline Arc_ptr
+Bin::nextarc( void )
+{
+    Arc_ptr jarc = current;
+
+#ifdef DEBUG
+    assert( jarc->check() != 0 );
+#endif
+
+    if( jarc ) current = jarc->link;
+    return jarc;
+}
+
+/*----------------------------------------------------------------------------
+ * BinIter::firstarc - set current arc to first arc of bin advance to next arc
+ *----------------------------------------------------------------------------
+ */
+
+inline Arc_ptr
+Bin::firstarc( void )
+{
+    current = head;
+    return nextarc( );
+}
+
+#endif /* __glubin_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/bufpool.cc b/src/glu/sgi/libnurbs/internals/bufpool.cc
new file mode 100644
index 00000000000..0a77693f443
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/bufpool.cc
@@ -0,0 +1,112 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ *  bufpool.c++
+ *
+ * $Date: 2004/05/12 15:29:36 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/bufpool.cc,v 1.2 2004/05/12 15:29:36 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "bufpool.h"
+
+
+/*-----------------------------------------------------------------------------
+ * Pool - allocate a new pool of buffers
+ *-----------------------------------------------------------------------------
+ */
+Pool::Pool( int _buffersize, int initpoolsize, char *n )
+{
+    if((unsigned)_buffersize < sizeof(Buffer))
+        buffersize = sizeof(Buffer);
+    else
+        buffersize = _buffersize;
+    initsize	= initpoolsize * buffersize;
+    nextsize	= initsize;
+    name	= n;
+    magic	= is_allocated;
+    nextblock	= 0;
+    curblock	= 0;
+    freelist	= 0;
+    nextfree	= 0;
+}
+
+/*-----------------------------------------------------------------------------
+ * ~Pool - free a pool of buffers and the pool itself
+ *-----------------------------------------------------------------------------
+ */
+
+Pool::~Pool( void )
+{
+    assert( (this != 0) && (magic == is_allocated) );
+
+    while( nextblock ) {
+	delete [] blocklist[--nextblock];
+        blocklist[nextblock] = 0;
+    }
+    magic = is_free;
+}
+
+
+void Pool::grow( void )
+{
+    assert( (this != 0) && (magic == is_allocated) );
+    curblock = new char[nextsize];
+    blocklist[nextblock++] = curblock;
+    nextfree = nextsize;
+    nextsize *= 2;
+}
+
+/*-----------------------------------------------------------------------------
+ * Pool::clear - free buffers associated with pool but keep pool 
+ *-----------------------------------------------------------------------------
+ */
+
+void 
+Pool::clear( void )
+{
+    assert( (this != 0) && (magic == is_allocated) );
+
+    while( nextblock ) {
+	delete [] blocklist[--nextblock];
+	blocklist[nextblock] = 0;
+    }
+    curblock	= 0;
+    freelist	= 0;
+    nextfree	= 0;
+    if( nextsize > initsize )
+        nextsize /= 2;
+}
diff --git a/src/glu/sgi/libnurbs/internals/bufpool.h b/src/glu/sgi/libnurbs/internals/bufpool.h
new file mode 100644
index 00000000000..3090374c217
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/bufpool.h
@@ -0,0 +1,146 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * bufpool.h
+ *
+ * $Date: 2001/03/22 11:38:36 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/bufpool.h,v 1.2 2001/03/22 11:38:36 joukj Exp $
+ */
+
+#ifndef __glubufpool_h_
+#define __glubufpool_h_
+
+#include "gluos.h"
+#include "myassert.h"
+#include "mystdlib.h"
+
+#define NBLOCKS	32
+
+class Buffer {
+	friend class 	Pool;
+	Buffer	*	next;		/* next buffer on free list	*/
+};
+
+class Pool {
+public:
+			Pool( int, int, char * );
+			~Pool( void );
+    inline void*	new_buffer( void );
+    inline void		free_buffer( void * );
+    void		clear( void );
+    
+private:
+    void		grow( void );
+
+protected:
+    Buffer		*freelist;		/* linked list of free buffers */
+    char		*blocklist[NBLOCKS];	/* blocks of malloced memory */
+    int			nextblock;		/* next free block index */
+    char		*curblock;		/* last malloced block */
+    int			buffersize;		/* bytes per buffer */
+    int			nextsize;		/* size of next block of memory	*/
+    int			nextfree;		/* byte offset past next free buffer */
+    int			initsize;
+    enum Magic { is_allocated = 0xf3a1, is_free = 0xf1a2 };
+    char		*name;			/* name of the pool */
+    Magic		magic;			/* marker for valid pool */
+};
+
+/*-----------------------------------------------------------------------------
+ * Pool::free_buffer - return a buffer to a pool
+ *-----------------------------------------------------------------------------
+ */
+
+inline void
+Pool::free_buffer( void *b )
+{
+    assert( (this != 0) && (magic == is_allocated) );
+
+    /* add buffer to singly connected free list */
+
+    ((Buffer *) b)->next = freelist;
+    freelist = (Buffer *) b;
+}
+
+
+/*-----------------------------------------------------------------------------
+ * Pool::new_buffer - allocate a buffer from a pool
+ *-----------------------------------------------------------------------------
+ */
+
+inline void * 
+Pool::new_buffer( void )
+{
+    void *buffer;
+
+    assert( (this != 0) && (magic == is_allocated) );
+
+    /* find free buffer */
+
+    if( freelist ) {
+    	buffer = (void *) freelist; 
+    	freelist = freelist->next;
+    } else {
+    	if( ! nextfree )
+    	    grow( );
+    	nextfree -= buffersize;;
+    	buffer = (void *) (curblock + nextfree);
+    }
+    return buffer;
+}
+	
+class PooledObj {
+public:
+    inline void *	operator new( size_t, Pool & );
+    inline void * 	operator new( size_t, void *);
+    inline void * 	operator new( size_t s)
+				{ return ::new char[s]; }
+    inline void 	operator delete( void * ) { assert( 0 ); }
+    inline void		deleteMe( Pool & );
+};
+
+inline void *
+PooledObj::operator new( size_t, Pool& pool )
+{
+    return pool.new_buffer();
+}
+
+inline void
+PooledObj::deleteMe( Pool& pool )
+{
+    pool.free_buffer( (void *) this );
+}
+
+#endif /* __glubufpool_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/cachingeval.cc b/src/glu/sgi/libnurbs/internals/cachingeval.cc
new file mode 100644
index 00000000000..7e8dc0e9895
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/cachingeval.cc
@@ -0,0 +1,80 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * cachingeval.c++
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/cachingeval.cc,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#include "cachingeval.h"
+
+int
+CachingEvaluator::canRecord( void )
+{
+    return 0;
+}
+
+int
+CachingEvaluator::canPlayAndRecord( void )
+{
+    return 0;
+}
+
+int
+CachingEvaluator::createHandle( int )
+{
+    return 0;
+}
+
+void
+CachingEvaluator::beginOutput( ServiceMode, int )
+{
+}
+
+void
+CachingEvaluator::endOutput( void )
+{
+} 
+
+void
+CachingEvaluator::discardRecording( int )
+{
+}
+
+void
+CachingEvaluator::playRecording( int )
+{
+}
diff --git a/src/glu/sgi/libnurbs/internals/cachingeval.h b/src/glu/sgi/libnurbs/internals/cachingeval.h
new file mode 100644
index 00000000000..a4f489e9311
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/cachingeval.h
@@ -0,0 +1,56 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * cachingeval.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/cachingeval.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __glucachingval_h_
+#define __glucachingval_h_
+
+class CachingEvaluator {
+public:
+    enum ServiceMode 	{ play, record, playAndRecord };
+    virtual int		canRecord( void );
+    virtual int		canPlayAndRecord( void );
+    virtual int		createHandle( int handle );
+    virtual void	beginOutput( ServiceMode, int handle );
+    virtual void	endOutput( void ); 
+    virtual void	discardRecording( int handle );
+    virtual void	playRecording( int handle );
+};
+#endif /* __glucachingval_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/ccw.cc b/src/glu/sgi/libnurbs/internals/ccw.cc
new file mode 100644
index 00000000000..b7a77b65b1c
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/ccw.cc
@@ -0,0 +1,567 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * ccw.c++
+ *
+ * $Date: 2002/11/01 23:35:07 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/ccw.cc,v 1.2 2002/11/01 23:35:07 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "subdivider.h"
+#include "types.h"
+#include "arc.h"
+#include "trimvertex.h"
+#include "simplemath.h"
+
+inline int 
+Subdivider::bbox( TrimVertex *a, TrimVertex *b, TrimVertex *c, int p )
+{
+    return bbox( a->param[p], b->param[p], c->param[p], 
+	         a->param[1-p], b->param[1-p], c->param[1-p] ); 
+}
+
+int
+Subdivider::ccwTurn_sr( Arc_ptr j1, Arc_ptr j2 ) // dir = 1
+{
+    register TrimVertex *v1	= &j1->pwlArc->pts[j1->pwlArc->npts-1];
+    register TrimVertex *v1last	= &j1->pwlArc->pts[0];
+    register TrimVertex *v2	= &j2->pwlArc->pts[0];
+    register TrimVertex *v2last	= &j2->pwlArc->pts[j2->pwlArc->npts-1];
+    register TrimVertex *v1next	= v1-1;
+    register TrimVertex *v2next	= v2+1;
+    int sgn;
+
+    assert( v1 != v1last );
+    assert( v2 != v2last );
+
+#ifndef NDEBUG
+    dprintf( "arc_ccw_turn, p = %d\n", 0 );
+#endif
+
+    // the arcs lie on the line (0 == v1->param[0])
+    if( v1->param[0] == v1next->param[0] && v2->param[0] == v2next->param[0] )
+	return 0;
+
+    if( v2next->param[0] < v2->param[0] || v1next->param[0] < v1->param[0] )
+	::mylongjmp( jumpbuffer, 28 );
+
+    if( v1->param[1] < v2->param[1] )
+	return 0;
+    else if( v1->param[1] > v2->param[1] )
+	return 1;
+
+    while( 1 ) {
+	if( v1next->param[0] < v2next->param[0] ) {
+#ifndef NDEBUG
+	    dprintf( "case a\n" );
+#endif
+	    assert( v1->param[0] <= v1next->param[0] );
+	    assert( v2->param[0] <= v1next->param[0] );
+	    switch( bbox( v2, v2next, v1next, 1 ) ) {
+		case -1:
+		    return 0;
+		case 0:
+		   sgn = ccw( v1next, v2, v2next );
+		   if( sgn != -1 ) {
+			return sgn;
+		   } else {
+#ifdef DEBUG
+			dprintf( "decr\n" );
+#endif
+			v1 = v1next--;
+			if( v1 == v1last ) {
+#ifdef DEBUG
+			    dprintf( "no good results\n" );
+#endif
+			    return 0; // ill-conditioned, guess answer
+			}
+		    }
+		    break;
+		case 1:
+		    return 1;
+	    }
+	} else if( v1next->param[0] > v2next->param[0] ) {
+#ifndef NDEBUG
+	    dprintf( "case b\n" );
+#endif
+	    assert( v1->param[0] <= v2next->param[0] );
+	    assert( v2->param[0] <= v2next->param[0] );
+	    switch( bbox( v1, v1next, v2next, 1 ) ) {
+		case -1:
+		    return 1;
+		case 0:
+		   sgn = ccw( v1next, v1, v2next );
+		   if( sgn != -1 ) { 
+			return sgn;
+		   } else {
+#ifdef DEBUG
+			dprintf( "incr\n" );
+#endif
+			v2 = v2next++;
+			if( v2 == v2last ) {
+#ifdef DEBUG
+			    dprintf( "no good results\n" );
+#endif
+			    return 0; // ill-conditioned, guess answer
+			}
+		    }
+		    break;
+		case 1:
+		    return 0;
+	    }
+	} else {
+#ifndef NDEBUG
+	    dprintf( "case ab\n" );
+#endif
+	    if( v1next->param[1] < v2next->param[1] )
+		return 0;
+	    else if( v1next->param[1] > v2next->param[1] )
+		return 1;
+	    else {
+#ifdef DEBUG
+		dprintf( "incr\n" );
+#endif
+		v2 = v2next++;
+		if( v2 == v2last ) {
+#ifdef DEBUG
+		    dprintf( "no good results\n" );
+#endif
+		    return 0; // ill-conditioned, guess answer
+		}
+	    }
+	}
+    }
+}
+
+int
+Subdivider::ccwTurn_sl( Arc_ptr j1, Arc_ptr j2 ) // dir = 0
+{
+    register TrimVertex *v1	= &j1->pwlArc->pts[j1->pwlArc->npts-1];
+    register TrimVertex *v1last	= &j1->pwlArc->pts[0];
+    register TrimVertex *v2	= &j2->pwlArc->pts[0];
+    register TrimVertex *v2last	= &j2->pwlArc->pts[j2->pwlArc->npts-1];
+    register TrimVertex *v1next	= v1-1;
+    register TrimVertex *v2next	= v2+1;
+    int sgn;
+
+    assert( v1 != v1last );
+    assert( v2 != v2last );
+
+#ifndef NDEBUG
+    dprintf( "arc_ccw_turn, p = %d\n", 0 );
+#endif
+
+    // the arcs lie on the line (0 == v1->param[0])
+    if( v1->param[0] == v1next->param[0] && v2->param[0] == v2next->param[0] )
+	return 0;
+
+    if( v2next->param[0] > v2->param[0] || v1next->param[0] > v1->param[0] ) 
+	::mylongjmp( jumpbuffer, 28 );
+
+    if( v1->param[1] < v2->param[1] )
+	return 1;
+    else if( v1->param[1] > v2->param[1] )
+	return 0;
+
+    while( 1 ) {
+	if( v1next->param[0] > v2next->param[0] ) {
+#ifndef NDEBUG
+	    dprintf( "case c\n" );
+#endif
+	    assert( v1->param[0] >= v1next->param[0] );
+	    assert( v2->param[0] >= v1next->param[0] );
+	    switch( bbox( v2next, v2, v1next, 1 ) ) {
+		case -1:
+		    return 1;
+		case 0:
+		    sgn = ccw( v1next, v2, v2next );
+		    if( sgn != -1 ) 
+			return sgn;
+		    else {
+			v1 = v1next--;
+#ifdef DEBUG
+			dprintf( "decr\n" );
+#endif
+			if( v1 == v1last ) {
+#ifdef DEBUG
+			    dprintf( "no good results\n" );
+#endif
+			    return 0; // ill-conditioned, guess answer
+			}
+		    }
+		    break;
+		case 1:
+		    return 0;
+	    }
+	} else if( v1next->param[0] < v2next->param[0] ) {
+#ifndef NDEBUG
+	    dprintf( "case d\n" );
+#endif
+	    assert( v1->param[0] >= v2next->param[0] );
+	    assert( v2->param[0] >= v2next->param[0] );
+	    switch( bbox( v1next, v1, v2next, 1 ) ) {
+		case -1:
+		    return 0;
+		case 0:
+		    sgn = ccw( v1next, v1, v2next );
+		    if( sgn != -1 ) 
+			return sgn;
+		    else {
+			v2 = v2next++;
+#ifdef DEBUG
+			dprintf( "incr\n" );
+#endif
+			if( v2 == v2last ) {
+#ifdef DEBUG
+			    dprintf( "no good results\n" );
+#endif
+			    return 0; // ill-conditioned, guess answer
+			}
+		    }
+		    break;
+		case 1:
+		    return 1;
+	    }
+	} else {
+#ifdef DEBUG
+	    dprintf( "case cd\n" );
+#endif
+	    if( v1next->param[1] < v2next->param[1] )
+		return 1;
+	    else if( v1next->param[1] > v2next->param[1] )
+		return 0;
+	    else {
+		v2 = v2next++;
+#ifdef DEBUG
+		dprintf( "incr\n" );
+#endif
+		if( v2 == v2last ) {
+#ifdef DEBUG
+		    dprintf( "no good results\n" );
+#endif
+		    return 0; // ill-conditioned, guess answer
+		}
+	    }
+	}
+    }
+}
+
+int
+Subdivider::ccwTurn_tr( Arc_ptr j1, Arc_ptr j2 ) // dir = 1
+{
+    register TrimVertex *v1	= &j1->pwlArc->pts[j1->pwlArc->npts-1];
+    register TrimVertex *v1last	= &j1->pwlArc->pts[0];
+    register TrimVertex *v2	= &j2->pwlArc->pts[0];
+    register TrimVertex *v2last	= &j2->pwlArc->pts[j2->pwlArc->npts-1];
+    register TrimVertex *v1next	= v1-1;
+    register TrimVertex *v2next	= v2+1;
+    int sgn;
+
+    assert( v1 != v1last );
+    assert( v2 != v2last );
+
+#ifndef NDEBUG
+    dprintf( "arc_ccw_turn, p = %d\n", 1 );
+#endif
+
+    // the arcs lie on the line (1 == v1->param[1])
+    if( v1->param[1] == v1next->param[1] && v2->param[1] == v2next->param[1] )
+	return 0;
+
+    if( v2next->param[1] < v2->param[1] || v1next->param[1] < v1->param[1] )
+	::mylongjmp( jumpbuffer, 28 );
+
+    if( v1->param[0] < v2->param[0] )
+	return 1;
+    else if( v1->param[0] > v2->param[0] )
+	return 0;
+
+    while( 1 ) {
+	if( v1next->param[1] < v2next->param[1] ) {
+#ifndef NDEBUG
+	    dprintf( "case a\n" );
+#endif
+	    assert( v1->param[1] <= v1next->param[1] );
+	    assert( v2->param[1] <= v1next->param[1] );
+	    switch( bbox( v2, v2next, v1next, 0 ) ) {
+		case -1:
+		    return 1;
+		case 0:
+		   sgn = ccw( v1next, v2, v2next );
+		   if( sgn != -1 ) {
+			return sgn;
+		   } else {
+#ifdef DEBUG
+			dprintf( "decr\n" );
+#endif
+			v1 = v1next--;
+			if( v1 == v1last ) {
+#ifdef DEBUG
+			    dprintf( "no good results\n" );
+#endif
+			    return 0; // ill-conditioned, guess answer
+			}
+		    }
+		    break;
+		case 1:
+		    return 0;
+	    }
+	} else if( v1next->param[1] > v2next->param[1] ) {
+#ifndef NDEBUG
+	    dprintf( "case b\n" );
+#endif
+	    assert( v1->param[1] <= v2next->param[1] );
+	    assert( v2->param[1] <= v2next->param[1] );
+	    switch( bbox( v1, v1next, v2next, 0 ) ) {
+		case -1:
+		    return 0;
+		case 0:
+		   sgn = ccw( v1next, v1, v2next );
+		   if( sgn != -1 ) { 
+			return sgn;
+		   } else {
+#ifdef DEBUG
+			dprintf( "incr\n" );
+#endif
+			v2 = v2next++;
+			if( v2 == v2last ) {
+#ifdef DEBUG
+			    dprintf( "no good results\n" );
+#endif
+			    return 0; // ill-conditioned, guess answer
+			}
+		    }
+		    break;
+		case 1:
+		    return 1;
+	    }
+	} else {
+#ifdef DEBUG
+	    dprintf( "case ab\n" );
+#endif
+	    if( v1next->param[0] < v2next->param[0] )
+		return 1;
+	    else if( v1next->param[0] > v2next->param[0] )
+		return 0;
+	    else {
+#ifdef DEBUG
+		dprintf( "incr\n" );
+#endif
+		v2 = v2next++;
+		if( v2 == v2last ) {
+#ifdef DEBUG
+		    dprintf( "no good results\n" );
+#endif
+		    return 0; // ill-conditioned, guess answer
+		}
+	    }
+	}
+    }
+}
+
+int
+Subdivider::ccwTurn_tl( Arc_ptr j1, Arc_ptr j2 )
+{
+    register TrimVertex *v1	= &j1->pwlArc->pts[j1->pwlArc->npts-1];
+    register TrimVertex *v1last	= &j1->pwlArc->pts[0];
+    register TrimVertex *v2	= &j2->pwlArc->pts[0];
+    register TrimVertex *v2last	= &j2->pwlArc->pts[j2->pwlArc->npts-1];
+    register TrimVertex *v1next	= v1-1;
+    register TrimVertex *v2next	= v2+1;
+    int sgn;
+
+    assert( v1 != v1last );
+    assert( v2 != v2last );
+
+#ifndef NDEBUG
+    dprintf( "arc_ccw_turn, p = %d\n", 1 );
+#endif
+
+    // the arcs lie on the line (1 == v1->param[1])
+    if( v1->param[1] == v1next->param[1] && v2->param[1] == v2next->param[1] )
+	return 0;
+
+    if( v2next->param[1] > v2->param[1] || v1next->param[1] > v1->param[1] ) 
+	::mylongjmp( jumpbuffer, 28 );
+
+    if( v1->param[0] < v2->param[0] )
+	return 0;
+    else if( v1->param[0] > v2->param[0] )
+	return 1;
+
+    while( 1 ) {
+	if( v1next->param[1] > v2next->param[1] ) {
+#ifndef NDEBUG
+	    dprintf( "case c\n" );
+#endif
+	    assert( v1->param[1] >= v1next->param[1] );
+	    assert( v2->param[1] >= v1next->param[1] );
+	    switch( bbox( v2next, v2, v1next, 0 ) ) {
+		case -1:
+		    return 0;
+		case 0:
+		    sgn = ccw( v1next, v2, v2next );
+		    if( sgn != -1 ) 
+			return sgn;
+		    else {
+			v1 = v1next--;
+#ifdef DEBUG
+			dprintf( "decr\n" );
+#endif
+			if( v1 == v1last ) {
+#ifdef DEBUG
+			    dprintf( "no good results\n" );
+#endif
+			    return 0; // ill-conditioned, guess answer
+			}
+		    }
+		    break;
+		case 1:
+		    return 1;
+	    }
+	} else if( v1next->param[1] < v2next->param[1] ) {
+#ifndef NDEBUG
+	    dprintf( "case d\n" );
+	    assert( v1->param[1] >= v2next->param[1] );
+	    assert( v2->param[1] >= v2next->param[1] );
+#endif
+	    switch( bbox( v1next, v1, v2next, 0 ) ) {
+		case -1:
+		    return 1;
+		case 0:
+		    sgn = ccw( v1next, v1, v2next );
+		    if( sgn != -1 ) 
+			return sgn;
+		    else {
+			v2 = v2next++;
+#ifdef DEBUG
+			dprintf( "incr\n" );
+#endif
+			if( v2 == v2last ) {
+#ifdef DEBUG
+			    dprintf( "no good results\n" );
+#endif
+			    return 0; // ill-conditioned, guess answer
+			}
+		    }
+		    break;
+		case 1:
+		    return 0;
+	    }
+	} else {
+#ifdef DEBUG
+	    dprintf( "case cd\n" );
+#endif
+	    if( v1next->param[0] < v2next->param[0] )
+		return 0;
+	    else if( v1next->param[0] > v2next->param[0] )
+		return 1;
+	    else {
+		v2 = v2next++;
+#ifdef DEBUG
+		dprintf( "incr\n" );
+#endif
+		if( v2 == v2last ) {
+#ifdef DEBUG
+		    dprintf( "no good results\n" );
+#endif
+		    return 0; // ill-conditioned, guess answer
+		}
+	    }
+	}
+    }
+}
+
+
+#ifndef NDEBUG
+int
+Subdivider::bbox( register REAL sa, register REAL sb, register REAL sc,
+      register REAL ta, register REAL tb, register REAL tc )
+#else
+int
+Subdivider::bbox( register REAL sa, register REAL sb, register REAL sc,
+      register REAL   , register REAL   , register REAL    )
+#endif
+{
+#ifndef NDEBUG
+    assert( tc >= ta );
+    assert( tc <= tb );
+#endif
+
+    if( sa < sb ) {
+	if( sc <= sa ) {
+	    return -1;
+	} else if( sb <= sc ) {
+	    return 1;
+	} else {
+	    return 0;
+	}
+    } else if( sa > sb ) {
+	if( sc >= sa ) {
+	    return 1;
+	} else if( sb >= sc ) {
+	    return -1;
+	} else {
+	    return 0;
+	}
+    } else {
+	if( sc > sa ) {
+	    return 1;
+	} else if( sb > sc ) {
+	    return -1;
+	} else {
+	    return 0;
+	}
+    }
+}
+
+/*----------------------------------------------------------------------------
+ * ccw - determine how three points are oriented by computing their
+ *	 determinant.  
+ *	 Return 1 if the vertices are ccw oriented, 
+ *		0 if they are cw oriented, or 
+ *		-1 if the computation is ill-conditioned.
+ *----------------------------------------------------------------------------
+ */
+int
+Subdivider::ccw( TrimVertex *a, TrimVertex *b, TrimVertex *c )
+{
+    REAL d = det3( a, b, c );
+    if( glu_abs(d) < 0.0001 ) return -1;
+    return (d < 0.0) ? 0 : 1;
+}
diff --git a/src/glu/sgi/libnurbs/internals/coveandtiler.cc b/src/glu/sgi/libnurbs/internals/coveandtiler.cc
new file mode 100644
index 00000000000..ca5bf36b363
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/coveandtiler.cc
@@ -0,0 +1,440 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * coveandtiler.c++
+ *
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "coveandtiler.h"
+#include "gridvertex.h"
+#include "gridtrimvertex.h"
+#include "uarray.h"
+#include "backend.h"
+
+
+const int CoveAndTiler::MAXSTRIPSIZE = 1000;
+
+CoveAndTiler::CoveAndTiler( Backend& b )
+	    : backend( b )
+{ }
+
+CoveAndTiler::~CoveAndTiler( void )
+{ }
+
+inline void
+CoveAndTiler::output( GridVertex &gv )
+{
+    backend.tmeshvert( &gv );
+}
+
+inline void
+CoveAndTiler::output( TrimVertex *tv )
+{
+    backend.tmeshvert( tv );
+}
+
+inline void
+CoveAndTiler::output( GridTrimVertex& g )
+{
+    backend.tmeshvert( &g );
+}
+
+void
+CoveAndTiler::coveAndTile( void )
+{
+    long ustart = (top.ustart >= bot.ustart) ? top.ustart : bot.ustart;
+    long uend	= (top.uend <= bot.uend)     ? top.uend   : bot.uend;
+    if( ustart <= uend ) {
+	tile( bot.vindex, ustart, uend );
+	if( top.ustart >= bot.ustart )
+	    coveUpperLeft();
+	else
+	    coveLowerLeft();
+
+	if( top.uend <= bot.uend )
+	    coveUpperRight();
+	else
+	    coveLowerRight();
+    } else {
+	TrimVertex blv, tlv, *bl, *tl;
+	GridTrimVertex bllv, tllv;
+	TrimVertex *lf = left.first();
+	TrimVertex *ll = left.last();
+	if( lf->param[0] >= ll->param[0] ) {
+	    blv.param[0] = lf->param[0];
+	    blv.param[1] = ll->param[1];
+	    blv.nuid = 0; // XXX
+	    assert( blv.param[1] == bot.vval );
+	    bl = &blv;
+	    tl = lf;
+	    tllv.set( lf );
+	    if( ll->param[0] > uarray.uarray[top.ustart-1] ) {
+		bllv.set( ll );
+		assert( ll->param[0] <= uarray.uarray[bot.ustart] );
+	    } else {
+		bllv.set( top.ustart-1, bot.vindex );
+	    }
+	    coveUpperLeftNoGrid( bl );
+	} else {
+	    tlv.param[0] = ll->param[0];
+	    tlv.param[1] = lf->param[1];
+	    tlv.nuid = 0; // XXX
+	    assert( tlv.param[1] == top.vval );
+	    tl = &tlv;
+	    bl = ll;
+	    bllv.set( ll );
+	    if( lf->param[0] > uarray.uarray[bot.ustart-1] ) {
+		assert( lf->param[0] <= uarray.uarray[bot.ustart] );
+		tllv.set( lf );
+	    } else {
+		tllv.set( bot.ustart-1, top.vindex );
+	    }
+	    coveLowerLeftNoGrid( tl );
+	}
+
+	TrimVertex brv, trv, *br, *tr;
+	GridTrimVertex brrv, trrv;
+	TrimVertex *rf = right.first();
+	TrimVertex *rl = right.last();
+
+	if( rf->param[0] <= rl->param[0] ) {
+	    brv.param[0] = rf->param[0];
+	    brv.param[1] = rl->param[1];
+	    brv.nuid = 0; // XXX
+	    assert( brv.param[1] == bot.vval );
+	    br = &brv;
+	    tr = rf;
+	    trrv.set( rf );
+	    if( rl->param[0] < uarray.uarray[top.uend+1] ) {
+		assert( rl->param[0] >= uarray.uarray[top.uend] );
+		brrv.set( rl );
+	    } else {
+		brrv.set( top.uend+1, bot.vindex );
+	    }
+	    coveUpperRightNoGrid( br );
+	} else {
+	    trv.param[0] = rl->param[0];
+	    trv.param[1] = rf->param[1];
+	    trv.nuid = 0; // XXX
+	    assert( trv.param[1] == top.vval );
+	    tr = &trv;
+	    br = rl;
+	    brrv.set( rl );
+	    if( rf->param[0] < uarray.uarray[bot.uend+1] ) {
+		assert( rf->param[0] >= uarray.uarray[bot.uend] );
+		trrv.set( rf );
+	    } else {
+		trrv.set( bot.uend+1, top.vindex );
+	    }
+	    coveLowerRightNoGrid( tr );
+	}
+
+	backend.bgntmesh( "doit" );
+	output(trrv);
+	output(tllv);
+	output( tr );
+	output( tl );
+	output( br );
+	output( bl );
+	output(brrv);
+	output(bllv);
+	backend.endtmesh();
+    }
+}
+
+void
+CoveAndTiler::tile( long vindex, long ustart, long uend )
+{
+    long numsteps = uend - ustart;
+
+    if( numsteps == 0 ) return;
+
+    if( numsteps > MAXSTRIPSIZE ) {
+	long umid = ustart + (uend - ustart) / 2;
+	tile( vindex, ustart, umid );
+	tile( vindex, umid, uend );
+    } else {
+	backend.surfmesh( ustart, vindex-1, numsteps, 1 );
+    }
+}
+
+void
+CoveAndTiler::coveUpperRight( void )
+{
+    GridVertex tgv( top.uend, top.vindex );
+    GridVertex gv( top.uend, bot.vindex );
+
+    right.first();
+    backend.bgntmesh( "coveUpperRight" );
+    output( right.next() );
+    output( tgv );
+    backend.swaptmesh();
+    output( gv );
+	coveUR();
+    backend.endtmesh();
+}
+
+void
+CoveAndTiler::coveUpperRightNoGrid( TrimVertex* br )
+{
+    backend.bgntmesh( "coveUpperRight" );
+    output( right.first() );
+    output( right.next() );
+    backend.swaptmesh();
+    output( br );
+	coveUR();
+    backend.endtmesh();
+}
+
+void
+CoveAndTiler::coveUR( )
+{
+    GridVertex gv( top.uend, bot.vindex );
+    TrimVertex *vert = right.next();
+    if( vert == NULL ) return;
+
+    assert( vert->param[0] >= uarray.uarray[gv.gparam[0]]  );
+
+    if( gv.nextu() >= bot.uend ) {
+	for( ; vert; vert = right.next() ) {
+	    output( vert );
+	    backend.swaptmesh();
+	}
+    } else while( 1 ) {
+	if( vert->param[0] < uarray.uarray[gv.gparam[0]]  ) {
+	    output( vert );
+	    backend.swaptmesh();
+	    vert = right.next();
+	    if( vert == NULL ) break;
+	} else {
+	    backend.swaptmesh();
+	    output( gv );
+	    if( gv.nextu() == bot.uend ) {
+		for( ; vert; vert = right.next() ) {
+		    output( vert );
+		    backend.swaptmesh();
+		}
+		break;
+	    }
+	}
+    }
+}
+
+void
+CoveAndTiler::coveUpperLeft( void )
+{
+    GridVertex tgv( top.ustart, top.vindex );
+    GridVertex gv( top.ustart, bot.vindex );
+
+    left.first();
+    backend.bgntmesh( "coveUpperLeft" );
+    output( tgv );
+    output( left.next() );
+    output( gv );
+    backend.swaptmesh();
+	coveUL();
+    backend.endtmesh();
+}
+
+void
+CoveAndTiler::coveUpperLeftNoGrid( TrimVertex* bl )
+{
+    backend.bgntmesh( "coveUpperLeftNoGrid" );
+    output( left.first() );
+    output( left.next() );
+    output( bl );
+    backend.swaptmesh();
+	coveUL();
+    backend.endtmesh();
+}
+
+void
+CoveAndTiler::coveUL()
+{
+    GridVertex gv( top.ustart, bot.vindex );
+    TrimVertex *vert = left.next();
+    if( vert == NULL ) return;
+    assert( vert->param[0] <= uarray.uarray[gv.gparam[0]]  );
+
+    if( gv.prevu() <= bot.ustart ) {
+	for( ; vert; vert = left.next() ) {
+	    backend.swaptmesh();
+	    output( vert );
+	}
+    } else while( 1 ) {
+	if( vert->param[0] > uarray.uarray[gv.gparam[0]]  ) {
+	    backend.swaptmesh();
+	    output( vert );
+	    vert = left.next();
+	    if( vert == NULL ) break;
+	} else {
+	    output( gv );
+	    backend.swaptmesh();
+	    if( gv.prevu() == bot.ustart ) {
+		for( ; vert; vert = left.next() ) {
+		    backend.swaptmesh();
+		    output( vert );
+		}
+		break;
+	    }
+	}
+    }
+}
+
+void
+CoveAndTiler::coveLowerLeft( void )
+{
+    GridVertex bgv( bot.ustart, bot.vindex );
+    GridVertex gv( bot.ustart, top.vindex );
+
+    left.last();
+    backend.bgntmesh( "coveLowerLeft" );
+    output( left.prev() );
+    output( bgv );
+    backend.swaptmesh();
+    output( gv );
+	coveLL();
+    backend.endtmesh();
+}
+
+void
+CoveAndTiler::coveLowerLeftNoGrid( TrimVertex* tl )
+{
+    backend.bgntmesh( "coveLowerLeft" );
+    output( left.last() );
+    output( left.prev() );
+    backend.swaptmesh();
+    output( tl );
+	coveLL( );
+    backend.endtmesh();
+}
+
+void
+CoveAndTiler::coveLL()
+{
+    GridVertex gv( bot.ustart, top.vindex );
+    TrimVertex *vert = left.prev();
+    if( vert == NULL ) return;
+    assert( vert->param[0] <= uarray.uarray[gv.gparam[0]]  );
+
+    if( gv.prevu() <= top.ustart ) {
+	for( ; vert; vert = left.prev() ) {
+	    output( vert );
+	    backend.swaptmesh();
+	}
+    } else while( 1 ) {
+	if( vert->param[0] > uarray.uarray[gv.gparam[0]] ){
+	    output( vert );
+	    backend.swaptmesh();
+	    vert = left.prev();
+	    if( vert == NULL ) break;
+	} else {
+	    backend.swaptmesh();
+	    output( gv );
+	    if( gv.prevu() == top.ustart ) {
+		for( ; vert; vert = left.prev() ) {
+		    output( vert );
+		    backend.swaptmesh();
+		}
+		break;
+	    }
+	}
+    }
+}
+
+void
+CoveAndTiler::coveLowerRight( void )
+{
+    GridVertex bgv( bot.uend, bot.vindex );
+    GridVertex gv( bot.uend, top.vindex );
+
+    right.last();
+    backend.bgntmesh( "coveLowerRight" );       
+    output( bgv );
+    output( right.prev() );
+    output( gv );
+    backend.swaptmesh();
+	coveLR();
+    backend.endtmesh( );
+}
+
+void
+CoveAndTiler::coveLowerRightNoGrid( TrimVertex* tr )
+{
+    backend.bgntmesh( "coveLowerRIght" );
+    output( right.last() );
+    output( right.prev() );
+    output( tr );
+    backend.swaptmesh();
+	coveLR();
+    backend.endtmesh();
+}
+
+void
+CoveAndTiler::coveLR( )
+{
+    GridVertex gv( bot.uend, top.vindex );
+    TrimVertex *vert = right.prev();
+    if( vert == NULL ) return;
+    assert( vert->param[0] >= uarray.uarray[gv.gparam[0]]  );
+
+    if( gv.nextu() >= top.uend ) {
+	for( ; vert; vert = right.prev() ) {
+	    backend.swaptmesh();
+	    output( vert );
+	}
+    } else while( 1 ) {
+	if( vert->param[0] < uarray.uarray[gv.gparam[0]]  ) {
+	    backend.swaptmesh();
+	    output( vert );
+	    vert = right.prev();
+	    if( vert == NULL ) break;
+	} else {
+	    output( gv );
+	    backend.swaptmesh();
+	    if( gv.nextu() == top.uend ) {
+		for( ; vert; vert = right.prev() ) {
+		    backend.swaptmesh();
+		    output( vert );
+		}
+		break;
+	    }
+	}
+    }
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/coveandtiler.h b/src/glu/sgi/libnurbs/internals/coveandtiler.h
new file mode 100644
index 00000000000..f6cc87948a0
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/coveandtiler.h
@@ -0,0 +1,78 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * coveandtiler.h
+ *
+ * $Date: 2001/07/16 15:46:42 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/coveandtiler.h,v 1.2 2001/07/16 15:46:42 brianp Exp $
+ */
+
+#ifndef __glucoveandtiler_h
+#define __glucoveandtiler_h
+
+#include "trimregion.h"
+#include "trimvertex.h"
+#include "gridvertex.h"
+
+class Backend;
+class GridTrimVertex;
+
+class CoveAndTiler : virtual public TrimRegion {
+public:
+    			CoveAndTiler( Backend& );
+    			~CoveAndTiler( void );
+    void 		coveAndTile( void );
+private:
+    Backend&		backend;
+    static const int 	MAXSTRIPSIZE;
+    void		tile( long, long, long );
+    void		coveLowerLeft( void );
+    void		coveLowerRight( void );
+    void		coveUpperLeft( void );
+    void		coveUpperRight( void );
+    void		coveUpperLeftNoGrid( TrimVertex * );
+    void		coveUpperRightNoGrid( TrimVertex * );
+    void		coveLowerLeftNoGrid( TrimVertex * );
+    void		coveLowerRightNoGrid( TrimVertex * );
+    void		coveLL( void );
+    void		coveLR( void );
+    void		coveUL( void );
+    void		coveUR( void );
+    inline void		output( GridTrimVertex& );
+    inline void		output( GridVertex& );
+    inline void		output( TrimVertex* );
+};
+
+#endif /* __glucoveandtiler_h */
diff --git a/src/glu/sgi/libnurbs/internals/curve.cc b/src/glu/sgi/libnurbs/internals/curve.cc
new file mode 100644
index 00000000000..a69686a972f
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/curve.cc
@@ -0,0 +1,200 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * curve.c++
+ *
+ * $Date: 2004/05/12 15:29:36 $ $Revision: 1.3 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/curve.cc,v 1.3 2004/05/12 15:29:36 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "mymath.h"
+#include "curve.h"
+#include "mapdesc.h"
+#include "types.h"
+#include "quilt.h"
+#include "nurbsconsts.h"
+
+/*--------------------------------------------------------------------------
+ * Curve::Curve - copy curve from quilt and transform control points
+ *--------------------------------------------------------------------------
+ */
+
+Curve::Curve( Quilt_ptr geo, REAL pta, REAL ptb, Curve *c )
+{
+    mapdesc = geo->mapdesc;
+    next = c;
+    needsSampling = mapdesc->isRangeSampling() ? 1 : 0;
+    cullval = mapdesc->isCulling() ? CULL_ACCEPT : CULL_TRIVIAL_ACCEPT;
+    order = geo->qspec[0].order;
+    stride = MAXCOORDS;
+
+    REAL *ps  = geo->cpts; 
+    Quiltspec_ptr qs = geo->qspec;
+    ps += qs->offset;
+    ps += qs->index * qs->order * qs->stride;
+
+    if( needsSampling )
+	mapdesc->xformSampling( ps, qs->order, qs->stride, spts, stride );
+	
+    if( cullval == CULL_ACCEPT )
+	mapdesc->xformCulling(  ps, qs->order, qs->stride, cpts, stride );
+
+    /* set untrimmed curve range */
+    range[0] = qs->breakpoints[qs->index];
+    range[1] = qs->breakpoints[qs->index+1];
+    range[2] = range[1] - range[0];
+
+    if( range[0] != pta ) {
+	Curve lower( *this, pta, 0 );
+	lower.next = next;
+	*this = lower;
+    }
+    if( range[1] != ptb ) {
+	Curve lower( *this, ptb, 0 );
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * Curve::Curve - subdivide a curve along an isoparametric line
+ *--------------------------------------------------------------------------
+ */
+
+Curve::Curve( Curve& upper, REAL value, Curve *c )
+{
+    Curve &lower = *this;
+
+    lower.next = c;
+    lower.mapdesc = upper.mapdesc;
+    lower.needsSampling = upper.needsSampling;
+    lower.order = upper.order;
+    lower.stride = upper.stride;
+    lower.cullval = upper.cullval;
+
+    REAL d = (value - upper.range[0]) / upper.range[2];
+
+    if( needsSampling )
+        mapdesc->subdivide( upper.spts, lower.spts, d, upper.stride, upper.order );
+
+    if( cullval == CULL_ACCEPT ) 
+        mapdesc->subdivide( upper.cpts, lower.cpts, d, upper.stride, upper.order );
+
+    lower.range[0] = upper.range[0];
+    lower.range[1] = value;
+    lower.range[2] = value - upper.range[0];
+    upper.range[0] = value;
+    upper.range[2] = upper.range[1] - value;
+}
+
+
+/*--------------------------------------------------------------------------
+ * Curve::clamp - clamp the sampling rate to a given maximum
+ *--------------------------------------------------------------------------
+ */
+
+void
+Curve::clamp( void )
+{
+    if( stepsize < minstepsize )
+        stepsize = mapdesc->clampfactor * minstepsize;
+}
+
+void
+Curve::setstepsize( REAL max )
+{
+    stepsize = ( max >= 1.0 ) ? (range[2] / max) : range[2];
+    minstepsize = stepsize;
+}
+
+void
+Curve::getstepsize( void )
+{
+    minstepsize= 0;
+
+    if( mapdesc->isConstantSampling() ) {
+	// fixed number of samples per patch in each direction
+	// maxrate is number of s samples per patch
+        setstepsize( mapdesc->maxrate );
+    } else if( mapdesc->isDomainSampling() ) {
+	// maxrate is number of s samples per unit s length of domain
+        setstepsize( mapdesc->maxrate * range[2] );
+    } else {
+	// upper bound on path length between sample points
+
+	assert( order <= MAXORDER );
+    
+	/* points have been transformed, therefore they are homogeneous */
+        REAL tmp[MAXORDER][MAXCOORDS];
+	const int tstride = sizeof(tmp[0]) / sizeof(REAL);
+	int val = mapdesc->project( spts, stride, &tmp[0][0], tstride,  order ); 
+
+        if( val == 0 ) {
+	    // control points cross infinity, therefore derivatives are undefined
+            setstepsize( mapdesc->maxrate );
+        } else {
+            REAL t = mapdesc->getProperty( N_PIXEL_TOLERANCE );
+	    if( mapdesc->isParametricDistanceSampling() ) {
+		REAL d = mapdesc->calcPartialVelocity( &tmp[0][0], tstride, order, 2, range[2] );
+		stepsize = (d > 0.0) ? sqrtf( 8.0 * t / d ) : range[2];
+		minstepsize = ( mapdesc->maxrate > 0.0 ) ? (range[2] / mapdesc->maxrate) : 0.0;
+	    } else if( mapdesc->isPathLengthSampling() ) {
+		// t is upper bound on path (arc) length
+		REAL d = mapdesc->calcPartialVelocity( &tmp[0][0], tstride, order, 1, range[2] );
+		stepsize = ( d > 0.0 ) ? (t / d) : range[2];
+		minstepsize = ( mapdesc->maxrate > 0.0 ) ? (range[2] / mapdesc->maxrate) : 0.0;
+	    } else {
+		// control points cross infinity, therefore partials are undefined
+		setstepsize( mapdesc->maxrate );
+	    }
+	}
+    }
+}
+
+int
+Curve::needsSamplingSubdivision( void )
+{
+    return ( stepsize < minstepsize )  ? 1 : 0;
+}
+
+int
+Curve::cullCheck( void )
+{
+    if( cullval == CULL_ACCEPT ) 
+	cullval = mapdesc->cullCheck( cpts, order, stride );
+    return cullval;
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/curve.h b/src/glu/sgi/libnurbs/internals/curve.h
new file mode 100644
index 00000000000..37aaae73237
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/curve.h
@@ -0,0 +1,76 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * curve.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/curve.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __glucurve_h_
+#define __glucurve_h_
+
+#include "types.h"
+#include "defines.h"
+
+class Mapdesc;
+class Quilt;
+
+
+class Curve {
+public:
+friend class Curvelist;
+    			Curve( Quilt *, REAL, REAL, Curve * );
+    			Curve( Curve&, REAL, Curve * );
+    Curve *		next;
+private:
+    Mapdesc *		mapdesc;
+    int			stride;
+    int		        order;
+    int			cullval;
+    int			needsSampling;
+    REAL		cpts[MAXORDER*MAXCOORDS];
+    REAL		spts[MAXORDER*MAXCOORDS];
+    REAL		stepsize;
+    REAL		minstepsize;
+    REAL		range[3];
+
+    void		clamp( void );
+    void		setstepsize( REAL );
+    void		getstepsize( void );
+    int			cullCheck( void );
+    int			needsSamplingSubdivision( void );
+};
+#endif /* __glucurve_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/curvelist.cc b/src/glu/sgi/libnurbs/internals/curvelist.cc
new file mode 100644
index 00000000000..e6b2133d554
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/curvelist.cc
@@ -0,0 +1,112 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * curvelist.c++
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/curvelist.cc,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "quilt.h"
+#include "curvelist.h"
+#include "curve.h"
+#include "nurbsconsts.h"
+#include "types.h"
+
+Curvelist::Curvelist( Quilt *quilts, REAL pta, REAL ptb )
+{
+    curve = 0;
+    for( Quilt *q = quilts; q; q = q->next ) 
+	curve = new Curve( q, pta, ptb, curve );
+    range[0] = pta;
+    range[1] = ptb;
+    range[2] = ptb - pta;
+}
+
+Curvelist::Curvelist( Curvelist &upper, REAL value )
+{
+    Curvelist &lower = *this;
+    curve = 0;
+    for( Curve *c = upper.curve; c; c = c->next )
+	curve = new Curve( *c, value, curve );
+
+    lower.range[0] = upper.range[0];
+    lower.range[1] = value;
+    lower.range[2] = value - upper.range[0];
+    upper.range[0] = value;
+    upper.range[2] = upper.range[1] - value;
+}
+
+Curvelist::~Curvelist()
+{
+    while( curve ) {
+	Curve *c = curve;
+	curve = curve->next;
+	delete c;
+    }
+}
+
+int
+Curvelist::cullCheck( void )
+{
+    for( Curve *c = curve; c; c = c->next )
+	if( c->cullCheck() == CULL_TRIVIAL_REJECT )
+	    return CULL_TRIVIAL_REJECT;
+    return CULL_ACCEPT;
+}
+
+void
+Curvelist::getstepsize( void )
+{
+    stepsize = range[2];
+    Curve *c;
+    for( c = curve; c; c = c->next ) {
+	c->getstepsize();
+	c->clamp();
+	stepsize =  ((c->stepsize < stepsize) ? c->stepsize : stepsize);
+	if( c->needsSamplingSubdivision() ) break;
+    }
+    needsSubdivision = ( c ) ? 1 : 0;
+}
+
+int
+Curvelist::needsSamplingSubdivision( void )
+{
+    return needsSubdivision;
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/curvelist.h b/src/glu/sgi/libnurbs/internals/curvelist.h
new file mode 100644
index 00000000000..23ffa2b55b7
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/curvelist.h
@@ -0,0 +1,68 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * curvelist.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/curvelist.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __glucurvelist_h_
+#define __glucurvelist_h_
+
+#include "types.h"
+#include "defines.h"
+
+class Mapdesc;
+class Quilt;
+class Curve;
+
+class Curvelist 
+{
+friend class Subdivider;
+public:
+			Curvelist( Quilt *, REAL, REAL );
+    			Curvelist( Curvelist &, REAL );
+			~Curvelist( void );
+    int			cullCheck( void );
+    void		getstepsize( void );
+    int			needsSamplingSubdivision();
+private:
+    Curve		*curve;
+    float		range[3];
+    int			needsSubdivision;
+    float		stepsize;
+};
+#endif /* __glucurvelist_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/curvesub.cc b/src/glu/sgi/libnurbs/internals/curvesub.cc
new file mode 100644
index 00000000000..63b8ac1eeb3
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/curvesub.cc
@@ -0,0 +1,105 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * curvesub.c++
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/curvesub.cc,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "subdivider.h"
+#include "renderhints.h"
+#include "backend.h"
+#include "quilt.h"
+#include "curvelist.h"
+#include "curve.h"
+#include "nurbsconsts.h"
+
+/*--------------------------------------------------------------------------
+ * drawCurves - main curve rendering entry point
+ *--------------------------------------------------------------------------
+ */
+
+void
+Subdivider::drawCurves( void )
+{
+    REAL 	from[1], to[1];
+    Flist	bpts;
+    qlist->getRange( from, to, bpts );
+
+    renderhints.init( );
+
+    backend.bgncurv();
+    for( int i=bpts.start; i<bpts.end-1; i++ ) {
+        REAL pta, ptb;
+	pta = bpts.pts[i];
+	ptb = bpts.pts[i+1];
+
+	qlist->downloadAll( &pta, &ptb, backend );
+
+	Curvelist curvelist( qlist, pta, ptb );
+	samplingSplit( curvelist, renderhints.maxsubdivisions );
+    }
+    backend.endcurv();
+}
+
+
+/*--------------------------------------------------------------------------
+ * samplingSplit - recursively subdivide patch, cull check each subpatch  
+ *--------------------------------------------------------------------------
+ */
+
+void
+Subdivider::samplingSplit( Curvelist& curvelist, int subdivisions )
+{
+    if( curvelist.cullCheck() == CULL_TRIVIAL_REJECT )  return;
+
+    curvelist.getstepsize();
+
+    if( curvelist.needsSamplingSubdivision() && (subdivisions > 0) ) {
+	REAL mid = ( curvelist.range[0] + curvelist.range[1] ) * 0.5;
+	Curvelist lowerlist( curvelist, mid );
+	samplingSplit( lowerlist, subdivisions-1 ); // lower
+	samplingSplit( curvelist, subdivisions-1 ); // upper
+    } else {
+	long nu = 1 + ((long) (curvelist.range[2] / curvelist.stepsize));
+	backend.curvgrid( curvelist.range[0], curvelist.range[1], nu );
+	backend.curvmesh( 0, nu );
+    }
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/dataTransform.cc b/src/glu/sgi/libnurbs/internals/dataTransform.cc
new file mode 100644
index 00000000000..1aabd363ea9
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/dataTransform.cc
@@ -0,0 +1,211 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+** 
+** http://oss.sgi.com/projects/FreeB
+** 
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+** 
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+** 
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+**
+** $Date: 2005/10/28 13:09:08 $ $Revision: 1.1.30.1 $
+*/
+/*
+** $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/dataTransform.cc,v 1.1.30.1 2005/10/28 13:09:08 brianp Exp $
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "glimports.h"
+#include "myassert.h"
+#include "nurbsconsts.h"
+#include "trimvertex.h"
+#include "dataTransform.h"
+
+extern directedLine* arcLoopToDLineLoop(Arc_ptr loop);
+
+#if 0 // UNUSED
+static directedLine* copy_loop(Arc_ptr loop, Real2* vertArray, int& index, directedLine dline_buf[], sampledLine sline_buf[], int& index_dline)
+{
+  directedLine *ret;
+  int old_index = index;
+  int i = index;
+  int j;
+  for(j=0; j<loop->pwlArc->npts-1; j++, i++)
+    {
+      vertArray[i][0] = loop->pwlArc->pts[j].param[0];
+      vertArray[i][1] = loop->pwlArc->pts[j].param[1];
+    }  
+  loop->clearmark();
+
+  for(Arc_ptr jarc = loop->next; jarc != loop; jarc=jarc->next)
+    {
+      for(j=0; j<jarc->pwlArc->npts-1; j++, i++)
+	{
+	  vertArray[i][0] = jarc->pwlArc->pts[j].param[0];
+	  vertArray[i][1] = jarc->pwlArc->pts[j].param[1];
+	}
+      jarc->clearmark();
+    }
+  //copy the first vertex again
+  vertArray[i][0] = loop->pwlArc->pts[0].param[0];
+  vertArray[i][1] = loop->pwlArc->pts[0].param[1];  
+  i++;
+  index=i;
+
+  directedLine* dline;
+  sampledLine* sline;
+  sline = &sline_buf[index_dline];
+  dline = &dline_buf[index_dline];
+  sline->init(2, &vertArray[old_index]);
+  dline->init(INCREASING, sline);
+  ret = dline;
+  index_dline++;
+
+  for(i=old_index+1; i<= index-2; i++)
+    {
+      sline = &sline_buf[index_dline];
+      dline = &dline_buf[index_dline];
+      sline->init(2, &vertArray[i]);
+      dline->init(INCREASING, sline);
+      ret->insert(dline);
+      index_dline++;
+    }
+  return ret;
+}
+#endif
+
+#if 0 // UNUSED
+static int num_edges(Bin& bin)
+{
+  int sum=0;
+  for(Arc_ptr jarc = bin.firstarc(); jarc; jarc=bin.nextarc())
+    sum += jarc->pwlArc->npts-1;
+  return sum;
+}
+#endif
+
+/*
+directedLine* bin_to_DLineLoops(Bin& bin)
+{
+  directedLine *ret=NULL;
+  directedLine *temp;
+
+  int numedges = num_edges(bin);
+  directedLine* dline_buf = new directedLine[numedges]; //not work for N32?
+  sampledLine* sline_buf=new sampledLine[numedges];
+
+  Real2* vertArray = new Real2[numedges*2];
+  int index = 0;
+  int index_dline = 0;
+  bin.markall();
+
+  for(Arc_ptr jarc = bin.firstarc(); jarc; jarc=bin.nextarc())
+    {
+      if(jarc->ismarked())
+	{
+	  assert(jarc->check() != 0);
+	  Arc_ptr jarchead = jarc;
+	  do {
+	    jarc->clearmark();
+	    jarc = jarc->next;
+	  } while(jarc != jarchead);
+	  temp=copy_loop(jarchead, vertArray, index, dline_buf, sline_buf, index_dline);
+	  ret = temp->insertPolygon(ret);
+	}
+    }
+
+  return ret;
+}
+*/
+
+
+directedLine* bin_to_DLineLoops(Bin& bin)
+{
+  directedLine *ret=NULL;
+  directedLine *temp;
+  bin.markall();
+  for(Arc_ptr jarc=bin.firstarc(); jarc; jarc=bin.nextarc()){
+    if(jarc->ismarked()) {
+      assert(jarc->check() != 0);
+      Arc_ptr jarchead = jarc;
+      do {
+	jarc->clearmark();
+	jarc = jarc->next;
+      } while(jarc != jarchead);
+      temp =  arcLoopToDLineLoop(jarc);
+      ret = temp->insertPolygon(ret);
+    }
+  }
+  return ret;
+}
+
+directedLine* o_pwlcurve_to_DLines(directedLine* original, O_pwlcurve* pwl)
+{
+  directedLine* ret = original;
+  for(Int i=0; i<pwl->npts-1; i++)
+    {
+      sampledLine* sline = new sampledLine(2);
+      sline->setPoint(0, pwl->pts[i].param);
+      sline->setPoint(1, pwl->pts[i+1].param);
+      directedLine* dline = new directedLine(INCREASING, sline);
+      if(ret == NULL)
+	ret = dline;
+      else
+	ret->insert(dline);
+    }
+  return ret;      
+}
+
+directedLine* o_curve_to_DLineLoop(O_curve* cur)
+{
+  directedLine *ret;
+  if(cur == NULL)
+    return NULL;
+  assert(cur->curvetype == ct_pwlcurve);
+  ret = o_pwlcurve_to_DLines(NULL, cur->curve.o_pwlcurve);
+  for(O_curve* temp = cur->next; temp != NULL; temp = temp->next)
+    {
+      assert(temp->curvetype == ct_pwlcurve);
+      ret = o_pwlcurve_to_DLines(ret, temp->curve.o_pwlcurve);
+    }
+  return ret;
+}
+
+directedLine* o_trim_to_DLineLoops(O_trim* trim)
+{
+  O_trim* temp;
+  directedLine *ret;
+  if(trim == NULL)
+    return NULL;
+  ret = o_curve_to_DLineLoop(trim->o_curve);
+
+  for(temp=trim->next; temp != NULL; temp = temp->next)
+    {
+      ret = ret->insertPolygon(o_curve_to_DLineLoop(temp->o_curve));
+    }
+  return ret;
+}
diff --git a/src/glu/sgi/libnurbs/internals/dataTransform.h b/src/glu/sgi/libnurbs/internals/dataTransform.h
new file mode 100644
index 00000000000..48c60e5f363
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/dataTransform.h
@@ -0,0 +1,66 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+** 
+** http://oss.sgi.com/projects/FreeB
+** 
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+** 
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+** 
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+**
+** $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+*/
+/*
+** $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/dataTransform.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+*/
+
+#ifndef _DATA_TRANSFORM_H
+#define _DATA_TRANSFORM_H
+
+#include "reader.h"
+#include "directedLine.h"
+#include "bin.h"
+directedLine* bin_to_DLineLoops(Bin& bin);
+
+/*transform the pwlcurve into a number of directedline lines
+ *insert these directedlines into orignal which is supposed to be
+ *the part of the trimming loop obtained so far.
+ *return the updated trimkming loop.
+ */
+directedLine* o_pwlcurve_to_DLines(directedLine* original, O_pwlcurve* pwl);
+
+/*transform a trim loop (curve) into a directedLine loop
+ */
+directedLine* o_curve_to_DLineLoop(O_curve* curve);
+
+/*transform a list of trim loops (trim) into
+ *a list of polygons represented as directedLine*.
+ */
+directedLine* o_trim_to_DLineLoops(O_trim* trim);
+
+
+#endif
+
diff --git a/src/glu/sgi/libnurbs/internals/defines.h b/src/glu/sgi/libnurbs/internals/defines.h
new file mode 100644
index 00000000000..1dde7c95ece
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/defines.h
@@ -0,0 +1,56 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * defines.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/defines.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __gludefines_h_
+#define __gludefines_h_
+
+/* culling constants */
+#define CULL_TRIVIAL_REJECT	0
+#define CULL_TRIVIAL_ACCEPT	1
+#define CULL_ACCEPT		2
+
+/* maximum order of a B-Spline */ 
+#define	MAXORDER 	24
+
+/* maximum dimension of any B-spline range space  */
+#define MAXCOORDS	5
+
+#endif /* __gludefines_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/displaylist.cc b/src/glu/sgi/libnurbs/internals/displaylist.cc
new file mode 100644
index 00000000000..00e5a411783
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/displaylist.cc
@@ -0,0 +1,84 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * displaylist.c++
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/displaylist.cc,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "mystdio.h"
+#include "nurbstess.h"
+#include "displaylist.h"
+
+
+DisplayList::DisplayList( NurbsTessellator  *_nt ) :
+	dlnodePool( sizeof( Dlnode ), 1, "dlnodepool" )
+{
+    lastNode = &nodes;
+    nt = _nt;
+}
+
+DisplayList::~DisplayList( void ) 
+{
+    for( Dlnode *nextNode; nodes; nodes = nextNode ) {
+	nextNode = nodes->next;
+	if( nodes->cleanup != 0 ) (nt->*nodes->cleanup)( nodes->arg );
+	//nodes->deleteMe(dlnodePool);
+    }
+}
+
+void 
+DisplayList::play( void )
+{
+    for( Dlnode *node = nodes; node; node = node->next ) 
+	if( node->work != 0 ) (nt->*node->work)( node->arg );
+}
+
+void 
+DisplayList::endList( void )
+{
+    *lastNode = 0;
+}
+
+void 
+DisplayList::append( PFVS work, void *arg, PFVS cleanup )
+{
+    Dlnode *node = new(dlnodePool) Dlnode( work, arg, cleanup );
+    *lastNode = node;
+    lastNode = &(node->next);
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/displaylist.h b/src/glu/sgi/libnurbs/internals/displaylist.h
new file mode 100644
index 00000000000..5a508552a36
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/displaylist.h
@@ -0,0 +1,84 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * displaylist.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/displaylist.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __gludisplaylist_h_
+#define __gludisplaylist_h_
+
+#include "glimports.h"
+#include "mysetjmp.h"
+#include "mystdio.h"
+#include "bufpool.h"
+
+class NurbsTessellator;
+
+typedef void (NurbsTessellator::*PFVS)( void * );
+
+struct Dlnode : public PooledObj {
+    			Dlnode( PFVS, void *, PFVS );
+    PFVS		work;
+    void *		arg;
+    PFVS		cleanup;
+    Dlnode *		next;
+};
+
+inline
+Dlnode::Dlnode( PFVS _work, void *_arg, PFVS _cleanup ) 
+{
+    work = _work;
+    arg = _arg;
+    cleanup = _cleanup;
+}
+
+class DisplayList {
+public:
+			DisplayList( NurbsTessellator * );
+			~DisplayList( void );
+    void		play( void );
+    void		append( PFVS work, void *arg, PFVS cleanup );
+    void		endList( void );
+private:
+    Dlnode 		*nodes;
+    Pool		dlnodePool;
+    Dlnode		**lastNode;
+    NurbsTessellator 	*nt;
+};
+
+#endif /* __gludisplaylist_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/displaymode.h b/src/glu/sgi/libnurbs/internals/displaymode.h
new file mode 100644
index 00000000000..f007d513e0a
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/displaymode.h
@@ -0,0 +1,47 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+** 
+** http://oss.sgi.com/projects/FreeB
+** 
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+** 
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+** 
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+**
+** $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+*/
+/*
+** $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/displaymode.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+*/
+
+#ifndef __gludisplaymode_h_
+#define __gludisplaymode_h_
+
+#define N_MESHFILL	0
+#define N_MESHLINE	1
+#define N_MESHPOINT	2
+
+#endif /* __gludisplaymode_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/flist.cc b/src/glu/sgi/libnurbs/internals/flist.cc
new file mode 100644
index 00000000000..0c4f215f48e
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/flist.cc
@@ -0,0 +1,120 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * flist.c++
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/flist.cc,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "flist.h"
+
+/*----------------------------------------------------------------------------
+ * Flist::Flist - initialize a REAL number array
+ *----------------------------------------------------------------------------
+ */
+Flist::Flist( void )
+{
+    npts = 0;
+    pts = 0;
+    start = end = 0;
+}
+
+/*----------------------------------------------------------------------------
+ * Flist::~Flist - free a REAL number array
+ *----------------------------------------------------------------------------
+ */
+Flist::~Flist( void )
+{
+    if( npts ) delete[] pts;
+}
+
+void
+Flist::add( REAL x )
+{
+    pts[end++] = x;
+    assert( end <= npts );
+}
+
+/*----------------------------------------------------------------------------
+ * Flist::filter - remove duplicate numbers from array
+ *----------------------------------------------------------------------------
+ */
+void Flist::filter( void )
+{
+    sorter.qsort( pts, end );
+    start = 0;
+
+    int j = 0;
+    for( int i = 1; i < end; i++ ) { 
+	if( pts[i] == pts[i-j-1] )
+	    j++;
+	pts[i-j] = pts[i];
+    }
+    end -= j;
+}
+
+/*----------------------------------------------------------------------------
+ * Flist::grow - ensure that array is large enough
+ *----------------------------------------------------------------------------
+ */
+void Flist::grow( int maxpts )
+{
+    if( npts < maxpts ) {
+	if( npts ) delete[] pts;
+	npts = 2 * maxpts; 
+	pts = new REAL[npts];
+	assert( pts != 0 );
+    }
+    start = end = 0;
+}
+
+/*----------------------------------------------------------------------------
+ * Flist::taper - ignore head and tail of array
+ *----------------------------------------------------------------------------
+ */
+void Flist::taper( REAL from, REAL to )
+{
+    while( pts[start] != from )
+	start++;
+
+    while( pts[end-1] != to )
+	end--;
+}
+
+
diff --git a/src/glu/sgi/libnurbs/internals/flist.h b/src/glu/sgi/libnurbs/internals/flist.h
new file mode 100644
index 00000000000..5d013891895
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/flist.h
@@ -0,0 +1,65 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * flist.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/flist.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __gluflist_h_
+#define __gluflist_h_
+
+#include "types.h"
+#include "flistsorter.h"
+
+class Flist {
+public:
+    REAL *		pts;		/* head of array */
+    int			npts;		/* number of points in array */
+    int			start;		/* first important point index */
+    int			end;		/* last important point index */
+
+    			Flist( void );
+    			~Flist( void );
+    void		add( REAL x );
+    void		filter( void );
+    void		grow( int);
+    void		taper( REAL , REAL );
+protected:
+    FlistSorter 	sorter;
+};
+
+#endif /* __gluflist_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/flistsorter.cc b/src/glu/sgi/libnurbs/internals/flistsorter.cc
new file mode 100644
index 00000000000..3daf8de7797
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/flistsorter.cc
@@ -0,0 +1,83 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * flistsorter.c++
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/flistsorter.cc,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "flistsorter.h"
+
+FlistSorter::FlistSorter( void ) : Sorter( sizeof( REAL ) )
+{
+}
+
+void
+FlistSorter::qsort( REAL *p, int n )
+{
+    Sorter::qsort( (char *)p, n );
+}
+
+int
+FlistSorter::qscmp( char *i, char *j )
+{
+    REAL f0 = *(REAL *)i;
+    REAL f1 = *(REAL *)j;
+    return (f0 < f1) ? -1 : 1;
+}
+
+void
+FlistSorter::qsexc( char *i, char *j )
+{
+    REAL *f0 = (REAL *)i;
+    REAL *f1 = (REAL *)j;
+    REAL tmp = *f0;
+    *f0 = *f1;
+    *f1 = tmp;
+}
+
+void
+FlistSorter::qstexc( char *i, char *j, char *k )
+{
+    REAL *f0 = (REAL *)i;
+    REAL *f1 = (REAL *)j;
+    REAL *f2 = (REAL *)k;
+    REAL tmp = *f0;
+    *f0 = *f2;
+    *f2 = *f1;
+    *f1 = tmp;
+}
diff --git a/src/glu/sgi/libnurbs/internals/flistsorter.h b/src/glu/sgi/libnurbs/internals/flistsorter.h
new file mode 100644
index 00000000000..beec36da563
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/flistsorter.h
@@ -0,0 +1,58 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * flistsorter.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/flistsorter.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __gluflistsorter_h_
+#define __gluflistsorter_h_
+
+#include "sorter.h"
+#include "types.h"
+
+class FlistSorter : public Sorter {
+public:
+			FlistSorter(void);
+    void		qsort( REAL *a, int n );
+
+protected:	
+    virtual int		qscmp( char *, char * );
+    virtual void	qsexc( char *i, char *j );	// i<-j, j<-i 
+    virtual void	qstexc( char *i, char *j, char *k ); // i<-k, k<-j, j<-i 
+};
+#endif /* __gluflistsorter_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/gridline.h b/src/glu/sgi/libnurbs/internals/gridline.h
new file mode 100644
index 00000000000..be612ee256c
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/gridline.h
@@ -0,0 +1,52 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * gridline.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/gridline.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glugridline_h_
+#define __glugridline_h_
+
+struct Gridline {
+    long 		v;
+    REAL		vval;
+    long		vindex;
+    long 		ustart;
+    long 		uend;
+ };
+#endif /* __glugridline_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/gridtrimvertex.h b/src/glu/sgi/libnurbs/internals/gridtrimvertex.h
new file mode 100644
index 00000000000..42edb13a3e7
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/gridtrimvertex.h
@@ -0,0 +1,95 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * gridtrimvertex.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/gridtrimvertex.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glugridtrimvertex_h_
+#define __glugridtrimvertex_h_
+
+#include "mystdlib.h"
+#include "bufpool.h"
+#include "trimvertex.h"
+#include "gridvertex.h"
+
+class GridTrimVertex : public PooledObj
+{
+private:
+    TrimVertex	dummyt;
+    GridVertex	dummyg;
+public:
+			GridTrimVertex() { g = 0; t = 0; }
+    TrimVertex	*t;
+    GridVertex	*g;
+   
+    inline void		set( long, long );
+    inline void		set( REAL, REAL );
+    inline void		set( TrimVertex * );
+    inline void		clear( void ) { t = 0; g = 0; };
+    inline int		isGridVert() { return g ? 1 : 0 ; }
+    inline int		isTrimVert() { return t ? 1 : 0 ; }
+    inline void		output();
+};
+
+inline void
+GridTrimVertex::set( long x, long y )
+{
+    g = &dummyg;
+    dummyg.gparam[0] = x;
+    dummyg.gparam[1] = y;
+}
+
+inline void
+GridTrimVertex::set( REAL x, REAL y )
+{
+    g = 0;
+    t = &dummyt;
+    dummyt.param[0] = x;
+    dummyt.param[1] = y;
+    dummyt.nuid = 0;
+}
+
+inline void
+GridTrimVertex::set( TrimVertex *v )
+{
+    g = 0;
+    t = v;
+}
+
+typedef GridTrimVertex *GridTrimVertex_p;
+#endif /* __glugridtrimvertex_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/gridvertex.h b/src/glu/sgi/libnurbs/internals/gridvertex.h
new file mode 100644
index 00000000000..bf512443e05
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/gridvertex.h
@@ -0,0 +1,54 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * gridvertex.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/gridvertex.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glugridvertex_h_
+#define __glugridvertex_h_
+
+struct GridVertex {
+    long 		gparam[2];
+			GridVertex( void ) {}
+			GridVertex( long u, long v ) { gparam[0] = u, gparam[1] = v; }
+    void		set( long u, long v ) { gparam[0] = u, gparam[1] = v; }
+    long		nextu() { return gparam[0]++; }
+    long		prevu() { return gparam[0]--; }
+};
+
+#endif /* __glugridvertex_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/hull.cc b/src/glu/sgi/libnurbs/internals/hull.cc
new file mode 100644
index 00000000000..305d9aaffb8
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/hull.cc
@@ -0,0 +1,167 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * hull.c++
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/hull.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "hull.h"
+#include "gridvertex.h"
+#include "gridtrimvertex.h"
+#include "gridline.h"
+#include "trimline.h"
+#include "uarray.h"
+#include "trimregion.h"
+
+Hull::Hull( void )
+{}
+
+Hull::~Hull( void )
+{}
+
+/*----------------------------------------------------------------------
+ * Hull:init - this routine does the initialization needed before any
+ *	 	calls to nextupper or nextlower can be made.
+ *----------------------------------------------------------------------
+ */
+void
+Hull::init( void )
+{
+    TrimVertex *lfirst = left.first();
+    TrimVertex *llast = left.last();
+    if( lfirst->param[0] <= llast->param[0] ) {
+	fakeleft.init( left.first() );
+	upper.left = &fakeleft;
+	lower.left = &left;
+    } else {
+	fakeleft.init( left.last() );
+	lower.left = &fakeleft;
+ 	upper.left = &left;
+    }
+    upper.left->last();
+    lower.left->first();
+
+    if( top.ustart <= top.uend ) {
+	upper.line = &top;
+	upper.index = top.ustart;
+    } else
+	upper.line = 0;
+
+    if( bot.ustart <= bot.uend ) {
+	lower.line = &bot;
+	lower.index = bot.ustart;
+    } else
+	lower.line = 0;
+
+    TrimVertex *rfirst = right.first();
+    TrimVertex *rlast = right.last();
+    if( rfirst->param[0] <= rlast->param[0] ) {
+	fakeright.init( right.last() );
+	lower.right = &fakeright;
+	upper.right = &right;
+    } else {
+	fakeright.init( right.first() );
+	upper.right = &fakeright;
+	lower.right = &right;
+    }
+    upper.right->first();
+    lower.right->last();
+}
+
+/*----------------------------------------------------------------------
+ * nextupper - find next vertex on upper hull of trim region.
+ *		 - if vertex is on trim curve, set vtop point to 
+ *		   that vertex.  if vertex is on grid, set vtop to
+ *		   point to temporary area and stuff coordinants into
+ *		   temporary vertex.  Also, place grid coords in temporary
+ *		   grid vertex.
+ *----------------------------------------------------------------------
+ */
+GridTrimVertex *
+Hull::nextupper( GridTrimVertex *gv )
+{
+    if( upper.left ) {
+	gv->set( upper.left->prev() );
+	if( gv->isTrimVert() ) return gv;
+	upper.left = 0;
+    } 
+
+    if( upper.line ) {
+	assert( upper.index <= upper.line->uend );
+	gv->set( uarray.uarray[upper.index], upper.line->vval );
+	gv->set( upper.index, upper.line->vindex );
+	if( upper.index++ == upper.line->uend ) upper.line = 0;
+	return gv; 
+    } 
+
+    if( upper.right ) {
+	gv->set( upper.right->next() );
+	if( gv->isTrimVert() ) return gv;
+	upper.right = 0;
+    } 
+
+    return 0; 
+}
+
+GridTrimVertex *
+Hull::nextlower( register GridTrimVertex *gv )
+{
+    if( lower.left ) {
+	gv->set( lower.left->next() );
+	if( gv->isTrimVert() ) return gv;
+	lower.left = 0;
+    } 
+
+    if( lower.line ) {
+	gv->set( uarray.uarray[lower.index], lower.line->vval );
+	gv->set( lower.index, lower.line->vindex );
+	if( lower.index++ == lower.line->uend ) lower.line = 0;
+	return gv;
+    } 
+
+    if( lower.right ) {
+	gv->set( lower.right->prev() );
+	if( gv->isTrimVert() ) return gv;
+	lower.right = 0;
+    } 
+
+    return 0;
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/hull.h b/src/glu/sgi/libnurbs/internals/hull.h
new file mode 100644
index 00000000000..00a1d4614ae
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/hull.h
@@ -0,0 +1,75 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * hull.h
+ *
+ * $Date: 2001/08/07 17:34:11 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/hull.h,v 1.2 2001/08/07 17:34:11 brianp Exp $
+ */
+
+#ifndef __gluhull_h_
+#define __gluhull_h_
+
+#include "trimline.h"
+#include "trimregion.h"
+#include "trimvertex.h"
+#include "gridtrimvertex.h"
+
+struct Gridline;
+class Uarray;
+
+class Hull : virtual public TrimRegion {
+public:
+    			Hull( void );
+    			~Hull( void );
+    void		init( void );
+    GridTrimVertex *	nextlower( GridTrimVertex * );
+    GridTrimVertex *	nextupper( GridTrimVertex * );
+private:
+    struct Side {
+	Trimline 	*left;
+	Gridline     	*line;
+	Trimline 	*right;
+	long 		index;
+    };
+	
+    Side 		lower;
+    Side		upper;
+    Trimline 		fakeleft;
+    Trimline		fakeright;
+};
+
+
+#endif /* __gluhull_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/intersect.cc b/src/glu/sgi/libnurbs/internals/intersect.cc
new file mode 100644
index 00000000000..b1e60fbce95
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/intersect.cc
@@ -0,0 +1,667 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * intersect.c++
+ *
+ * $Date: 2005/10/28 13:09:08 $ $Revision: 1.2.8.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/intersect.cc,v 1.2.8.1 2005/10/28 13:09:08 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "subdivider.h"
+#include "arc.h"
+#include "bin.h"
+#include "backend.h"
+#include "trimvertpool.h"
+
+/*#define NOTDEF*/
+
+enum i_result { INTERSECT_VERTEX, INTERSECT_EDGE };
+
+/* local functions */
+#ifndef NDEBUG  // for asserts only
+static int		arc_classify( Arc_ptr, int, REAL );
+#endif
+static enum i_result	pwlarc_intersect( PwlArc *, int, REAL, int, int[3] );
+
+
+void
+Subdivider::partition( Bin & bin, Bin & left, Bin & intersections, 
+	        Bin & right, Bin & unknown, int param, REAL value )
+{
+    Bin	headonleft, headonright, tailonleft, tailonright;
+
+    for( Arc_ptr jarc = bin.removearc(); jarc; jarc = bin.removearc() ) {
+
+	REAL tdiff = jarc->tail()[param] - value;
+	REAL hdiff = jarc->head()[param] - value;
+
+	if( tdiff > 0.0 ) {
+	    if( hdiff > 0.0 ) {
+		right.addarc( jarc  );
+	    } else if( hdiff == 0.0 ) {
+		tailonright.addarc( jarc  );
+	    } else {
+	        Arc_ptr	jtemp;
+		switch( arc_split(jarc, param, value, 0) ) {
+		    case 2:
+			tailonright.addarc( jarc  );
+			headonleft.addarc( jarc->next  );
+			break;
+		    case 31:
+			assert( jarc->head()[param] > value );
+			right.addarc( jarc  );
+			tailonright.addarc( jtemp = jarc->next  );
+			headonleft.addarc( jtemp->next  );
+		        break;
+		    case 32:
+			assert( jarc->head()[param] <= value );
+			tailonright .addarc( jarc  );
+			headonleft.addarc( jtemp = jarc->next  );
+			left.addarc( jtemp->next  );
+			break;
+		    case 4:
+			right.addarc( jarc  );
+			tailonright.addarc( jtemp = jarc->next  );
+			headonleft.addarc( jtemp = jtemp->next  );
+			left.addarc( jtemp->next  );
+		}
+	    }
+	} else if( tdiff == 0.0 ) {
+	    if( hdiff > 0.0 ) {
+		headonright.addarc( jarc  );
+	    } else if( hdiff == 0.0 ) {
+		unknown.addarc( jarc  );
+	    } else {
+		headonleft.addarc( jarc  );
+	    }
+	} else {
+	    if( hdiff > 0.0 ) {
+	        Arc_ptr	jtemp;
+		switch( arc_split(jarc, param, value, 1) ) {
+		    case 2:
+			tailonleft.addarc( jarc  );
+			headonright.addarc( jarc->next  );
+			break;
+		    case 31:
+			assert( jarc->head()[param] < value );
+			left.addarc( jarc  );
+			tailonleft.addarc( jtemp = jarc->next  );
+			headonright.addarc( jtemp->next  );
+			break;
+		    case 32:
+			assert( jarc->head()[param] >= value );
+			tailonleft.addarc( jarc  );
+			headonright.addarc( jtemp = jarc->next  );
+			right.addarc( jtemp->next  );
+			break;
+		    case 4:
+			left.addarc( jarc  );
+			tailonleft.addarc( jtemp = jarc->next  );
+			headonright.addarc( jtemp = jtemp->next  );
+			right.addarc( jtemp->next  );
+		}
+	    } else if( hdiff == 0.0 ) {
+		tailonleft.addarc( jarc  );
+	    } else {
+		left.addarc( jarc  );
+	    }
+	}
+    }
+    if( param == 0 ) {
+	classify_headonleft_s( headonleft, intersections, left, value );
+	classify_tailonleft_s( tailonleft, intersections, left, value );
+	classify_headonright_s( headonright, intersections, right, value );
+	classify_tailonright_s( tailonright, intersections, right, value );
+    } else {
+	classify_headonleft_t( headonleft, intersections, left, value );
+	classify_tailonleft_t( tailonleft, intersections, left, value );
+	classify_headonright_t( headonright, intersections, right, value );
+	classify_tailonright_t( tailonright, intersections, right, value );
+    }
+}
+
+inline static void 
+vert_interp( TrimVertex *n, TrimVertex *l, TrimVertex *r, int p, REAL val )
+{
+    assert( val > l->param[p]);
+    assert( val < r->param[p]);
+
+    n->nuid = l->nuid;
+
+    n->param[p] = val;
+    if( l->param[1-p] != r->param[1-p]  ) {
+	REAL ratio = (val - l->param[p]) / (r->param[p] - l->param[p]);
+	n->param[1-p] = l->param[1-p] + 
+		        ratio * (r->param[1-p] - l->param[1-p]);
+    } else {
+	n->param[1-p] = l->param[1-p];
+    }
+}
+	
+int
+Subdivider::arc_split( Arc_ptr jarc, int param, REAL value, int dir )
+{
+    int		maxvertex = jarc->pwlArc->npts;
+    Arc_ptr	jarc1;
+    TrimVertex* v = jarc->pwlArc->pts;
+
+    int		loc[3];
+    switch( pwlarc_intersect( jarc->pwlArc, param, value, dir, loc ) ) {
+
+		// When the parameter value lands on a vertex, life is sweet
+    case INTERSECT_VERTEX: {
+	    jarc1 = new(arcpool) Arc( jarc, new( pwlarcpool) PwlArc( maxvertex-loc[1], &v[loc[1]] ) );
+	    jarc->pwlArc->npts = loc[1] + 1;
+	    jarc1->next = jarc->next;
+	    jarc1->next->prev = jarc1;
+	    jarc->next = jarc1;
+	    jarc1->prev = jarc;
+	    assert(jarc->check() != 0);
+	    return 2;
+	}
+
+		// When the parameter value intersects an edge, we have to
+		// interpolate a new vertex.  There are special cases
+		// if the new vertex is adjacent to one or both of the
+		// endpoints of the arc.
+    case INTERSECT_EDGE: {
+	    int i, j;
+	    if( dir == 0 ) {
+		i = loc[0];
+		j = loc[2];
+	    } else {
+		i = loc[2];
+		j = loc[0];
+	    }
+
+#ifndef NOTDEF
+	    // The split is between vertices at index j and i, in that
+	    // order (j < i)
+	    
+	    // JEB:  This code is my idea of how to do the split without
+	    // increasing the number of links.  I'm doing this so that
+	    // the is_rect routine can recognize rectangles created by
+	    // subdivision.  In exchange for simplifying the curve list,
+      	    // however, it costs in allocated space and vertex copies.
+	    
+	    TrimVertex *newjunk = trimvertexpool.get(maxvertex -i+1 /*-j*/);
+	    int k;
+	    for(k=0; k<maxvertex-i; k++)
+	      {
+		newjunk[k+1] = v[i+k];
+		newjunk[k+1].nuid = jarc->nuid;
+	      }
+	    
+	    TrimVertex *vcopy = trimvertexpool.get(maxvertex);
+	    for(k=0; k<maxvertex; k++)
+	      {
+		vcopy[k].param[0] = v[k].param[0];
+		vcopy[k].param[1] = v[k].param[1];
+	      }
+	    jarc->pwlArc->pts=vcopy;
+
+	    v[i].nuid = jarc->nuid;
+	    v[j].nuid = jarc->nuid;
+	    vert_interp( &newjunk[0], &v[loc[0]], &v[loc[2]], param, value );
+
+	    if( showingDegenerate() )
+		backend.triangle( &v[i], &newjunk[0], &v[j] );
+
+            vcopy[j+1].param[0]=newjunk[0].param[0];
+            vcopy[j+1].param[1]=newjunk[0].param[1];
+
+
+	    jarc1 = new(arcpool) Arc( jarc,
+			new(pwlarcpool) PwlArc(maxvertex-i+1 , newjunk ) );
+
+	    jarc->pwlArc->npts = j+2;
+	    jarc1->next = jarc->next;
+	    jarc1->next->prev = jarc1;
+	    jarc->next = jarc1;
+	    jarc1->prev = jarc;
+	    assert(jarc->check() != 0);
+
+	    return 2;
+#endif //not NOTDEF
+		// JEB: This is the original version:
+#ifdef NOTDEF
+            Arc_ptr    jarc2, jarc3;
+	    
+	    TrimVertex *newjunk = trimvertexpool.get(3);
+	    v[i].nuid = jarc->nuid;
+	    v[j].nuid = jarc->nuid;
+	    newjunk[0] = v[j];
+	    newjunk[2] = v[i];
+	    vert_interp( &newjunk[1], &v[loc[0]], &v[loc[2]], param, value );
+
+	    if( showingDegenerate() )
+		backend.triangle( &newjunk[2], &newjunk[1], &newjunk[0] );
+
+		// New vertex adjacent to both endpoints
+	    if (maxvertex == 2) {
+		jarc1 = new(arcpool) Arc( jarc, new(pwlarcpool) PwlArc( 2, newjunk+1 ) );
+		jarc->pwlArc->npts = 2;
+		jarc->pwlArc->pts = newjunk;
+		jarc1->next = jarc->next;
+		jarc1->next->prev = jarc1;
+		jarc->next = jarc1;
+		jarc1->prev = jarc;
+		assert(jarc->check() != 0);
+
+		return 2;
+
+		// New vertex adjacent to ending point of arc
+	    } else if (maxvertex - j == 2) {
+		jarc1 = new(arcpool) Arc( jarc, new(pwlarcpool) PwlArc( 2, newjunk ) );
+		jarc2 = new(arcpool) Arc( jarc, new(pwlarcpool) PwlArc( 2, newjunk+1 ) );
+		jarc->pwlArc->npts = maxvertex-1;
+		jarc2->next = jarc->next;
+		jarc2->next->prev = jarc2;
+		jarc->next = jarc1;
+		jarc1->prev = jarc;
+		jarc1->next = jarc2;
+		jarc2->prev = jarc1;
+		assert(jarc->check() != 0);
+		return 31;
+
+		// New vertex adjacent to starting point of arc
+	    } else if (i == 1) {
+		jarc1 = new(arcpool) Arc( jarc, new(pwlarcpool) PwlArc( 2, newjunk+1 ) );
+		jarc2 = new(arcpool) Arc( jarc, 
+			new(pwlarcpool) PwlArc( maxvertex-1, &jarc->pwlArc->pts[1] ) );
+		jarc->pwlArc->npts = 2;
+		jarc->pwlArc->pts = newjunk;
+		jarc2->next = jarc->next;
+		jarc2->next->prev = jarc2;
+		jarc->next = jarc1;
+		jarc1->prev = jarc;
+		jarc1->next = jarc2;
+		jarc2->prev = jarc1;
+		assert(jarc->check() != 0);
+		return 32;
+
+		// It's somewhere in the middle
+	    } else {
+		jarc1 = new(arcpool) Arc( jarc, new(pwlarcpool) PwlArc( 2, newjunk ) );
+		jarc2 = new(arcpool) Arc( jarc, new(pwlarcpool) PwlArc( 2, newjunk+1 ) );
+		jarc3 = new(arcpool) Arc( jarc, new(pwlarcpool) PwlArc( maxvertex-i, v+i ) );
+		jarc->pwlArc->npts = j + 1;
+		jarc3->next = jarc->next;
+		jarc3->next->prev = jarc3;
+		jarc->next = jarc1;
+		jarc1->prev = jarc;
+		jarc1->next = jarc2;
+		jarc2->prev = jarc1;
+		jarc2->next = jarc3;
+		jarc3->prev = jarc2;
+		assert(jarc->check() != 0);
+		return 4;
+	    }
+#endif // NOTDEF
+	}
+	default:
+	return -1; //picked -1 since it's not used
+    }
+}
+
+/*----------------------------------------------------------------------------
+ * pwlarc_intersect -  find intersection of pwlArc and isoparametric line
+ *----------------------------------------------------------------------------
+ */
+
+static enum i_result
+pwlarc_intersect(
+    PwlArc *pwlArc,
+    int param,
+    REAL value,
+    int dir,
+    int loc[3] )
+{
+    assert( pwlArc->npts > 0 );
+
+    if( dir ) {
+	TrimVertex *v = pwlArc->pts;
+	int imin = 0; 
+	int imax = pwlArc->npts - 1;
+	assert( value > v[imin].param[param] );
+	assert( value < v[imax].param[param] );	
+	while( (imax - imin) > 1 ) {
+	    int imid = (imax + imin)/2;
+	    if( v[imid].param[param] > value )
+		imax = imid;
+	    else if( v[imid].param[param] < value )
+		imin = imid;
+	    else {
+		loc[1] = imid;
+		return INTERSECT_VERTEX;
+	    }
+	}
+	loc[0] = imin;
+	loc[2] = imax;
+	return INTERSECT_EDGE;
+    } else {
+	TrimVertex *v = pwlArc->pts;
+	int imax = 0; 
+	int imin = pwlArc->npts - 1;
+	assert( value > v[imin].param[param] );
+	assert( value < v[imax].param[param] );	
+	while( (imin - imax) > 1 ) {
+	    int imid = (imax + imin)/2;
+	    if( v[imid].param[param] > value )
+		imax = imid;
+	    else if( v[imid].param[param] < value )
+		imin = imid;
+	    else {
+		loc[1] = imid;
+		return INTERSECT_VERTEX;
+	    }
+	}
+	loc[0] = imin;
+	loc[2] = imax;
+	return INTERSECT_EDGE;
+    }
+}
+
+/*----------------------------------------------------------------------------
+ * arc_classify - determine which side of a line a jarc lies 
+ *----------------------------------------------------------------------------
+ */
+
+#ifndef NDEBUG  // for asserts only
+static int
+arc_classify( Arc_ptr jarc, int param, REAL value )
+{
+    REAL tdiff, hdiff;
+    if( param == 0 ) {
+	tdiff = jarc->tail()[0] - value;
+	hdiff = jarc->head()[0] - value;
+    } else {
+	tdiff = jarc->tail()[1] - value;
+	hdiff = jarc->head()[1] - value;
+    }
+
+    if( tdiff > 0.0 ) {
+	if( hdiff > 0.0 ) {
+	    return 0x11;
+	} else if( hdiff == 0.0 ) {
+	    return 0x12;
+	} else {
+	    return 0x10;
+	}
+    } else if( tdiff == 0.0 ) {
+	if( hdiff > 0.0 ) {
+	    return 0x21;
+	} else if( hdiff == 0.0 ) {
+	    return 0x22;
+	} else {
+	    return 0x20;
+	}
+    } else {
+	if( hdiff > 0.0 ) {
+	    return 0x01;
+	} else if( hdiff == 0.0 ) {
+	    return 0x02;
+	} else {
+	    return 0;
+	}
+    }
+}
+#endif
+
+void
+Subdivider::classify_tailonleft_s( Bin& bin, Bin& in, Bin& out, REAL val )
+{
+    /* tail at left, head on line */
+    Arc_ptr j;
+
+    while( (j = bin.removearc()) != NULL ) {
+	assert( arc_classify( j, 0, val ) == 0x02 );
+	j->clearitail();
+
+	REAL diff = j->next->head()[0] - val;
+	if( diff > 0.0 ) {
+	    in.addarc( j );
+	} else if( diff < 0.0 ) {
+	    if( ccwTurn_sl( j, j->next ) )
+		out.addarc( j );
+	    else
+		in.addarc( j );
+	} else {
+	    if( j->next->tail()[1] > j->next->head()[1] ) 
+		in.addarc(j);
+	    else
+		out.addarc(j);
+	}
+    }
+}
+
+void
+Subdivider::classify_tailonleft_t( Bin& bin, Bin& in, Bin& out, REAL val )
+{
+    /* tail at left, head on line */
+    Arc_ptr j;
+
+    while( (j = bin.removearc()) != NULL ) {
+	assert( arc_classify( j, 1, val ) == 0x02 );
+	j->clearitail();
+
+        REAL diff = j->next->head()[1] - val;
+	if( diff > 0.0 ) {
+	    in.addarc( j );
+	} else if( diff < 0.0 ) {
+	    if( ccwTurn_tl( j, j->next ) )
+		out.addarc( j );
+	    else
+		in.addarc( j );
+	} else {
+	    if (j->next->tail()[0] > j->next->head()[0] )
+		out.addarc( j );
+	    else
+		in.addarc( j );
+	}
+    }
+}
+
+void
+Subdivider::classify_headonleft_s( Bin& bin, Bin& in, Bin& out, REAL val )
+{
+    /* tail on line, head at left */
+    Arc_ptr j;
+
+    while( (j = bin.removearc()) != NULL ) {
+	assert( arc_classify( j, 0, val ) == 0x20 );
+
+	j->setitail();
+
+	REAL diff = j->prev->tail()[0] - val;
+	if( diff > 0.0 ) {
+	    out.addarc( j );
+	} else if( diff < 0.0 ) {
+	    if( ccwTurn_sl( j->prev, j ) )
+		out.addarc( j );
+	    else
+		in.addarc( j );
+	} else {
+	    if( j->prev->tail()[1] > j->prev->head()[1] )
+		in.addarc( j );
+	    else
+		out.addarc( j );
+	}
+    }
+}
+
+void
+Subdivider::classify_headonleft_t( Bin& bin, Bin& in, Bin& out, REAL val )
+{
+    /* tail on line, head at left */
+    Arc_ptr j;
+
+    while( (j = bin.removearc()) != NULL ) {
+	assert( arc_classify( j, 1, val ) == 0x20 );
+	j->setitail();
+
+	REAL diff = j->prev->tail()[1] - val;
+	if( diff > 0.0 ) {
+	    out.addarc( j );
+	} else if( diff < 0.0 ) {
+	    if( ccwTurn_tl( j->prev, j ) )
+		out.addarc( j );
+	    else
+		in.addarc( j );
+	} else {
+	    if( j->prev->tail()[0] > j->prev->head()[0] )
+		out.addarc( j );
+	    else
+		in.addarc( j );
+	}
+    }
+}
+
+
+void
+Subdivider::classify_tailonright_s( Bin& bin, Bin& in, Bin& out, REAL val )
+{
+    /* tail at right, head on line */
+    Arc_ptr j;
+
+    while( (j = bin.removearc()) != NULL ) {
+	assert( arc_classify( j, 0, val ) == 0x12);
+	
+	j->clearitail();
+
+        REAL diff = j->next->head()[0] - val;
+	if( diff > 0.0 ) {
+	    if( ccwTurn_sr( j, j->next ) )
+		out.addarc( j );
+	    else
+		in.addarc( j );
+	} else if( diff < 0.0 ) {
+	    in.addarc( j );
+	} else {
+	    if( j->next->tail()[1] > j->next->head()[1] ) 
+		out.addarc( j );
+	    else
+		in.addarc( j );
+	}
+    }
+}
+
+void
+Subdivider::classify_tailonright_t( Bin& bin, Bin& in, Bin& out, REAL val )
+{
+    /* tail at right, head on line */
+    Arc_ptr j;
+
+    while( (j = bin.removearc()) != NULL ) {
+	assert( arc_classify( j, 1, val ) == 0x12);
+	
+	j->clearitail();
+
+	REAL diff =  j->next->head()[1] - val;
+	if( diff > 0.0 ) {
+	    if( ccwTurn_tr( j, j->next ) )
+		out.addarc( j );
+	    else
+		in.addarc( j );
+	} else if( diff < 0.0 ) { 
+	    in.addarc( j );
+	} else {
+	    if( j->next->tail()[0] > j->next->head()[0] ) 
+		in.addarc( j );
+	    else
+		out.addarc( j );
+	}
+    }
+}
+
+void
+Subdivider::classify_headonright_s( Bin& bin, Bin& in, Bin& out, REAL val )
+{
+    /* tail on line, head at right */
+    Arc_ptr j;
+
+    while( (j = bin.removearc()) != NULL ) {
+	assert( arc_classify( j, 0, val ) == 0x21 );
+    
+	j->setitail();
+
+        REAL diff = j->prev->tail()[0] - val;
+	if( diff > 0.0 ) { 
+	    if( ccwTurn_sr( j->prev, j ) )
+		out.addarc( j );
+	    else
+		in.addarc( j );
+	} else if( diff < 0.0 ) {
+	    out.addarc( j );
+	} else {
+	    if( j->prev->tail()[1] > j->prev->head()[1] )
+		out.addarc( j );
+	    else
+		in.addarc( j );
+	}
+    }
+}
+
+void
+Subdivider::classify_headonright_t( Bin& bin, Bin& in, Bin& out, REAL val )
+{
+    /* tail on line, head at right */
+    Arc_ptr j;
+
+    while( (j = bin.removearc()) != NULL ) {
+	assert( arc_classify( j, 1, val ) == 0x21 );
+    
+	j->setitail();
+
+        REAL diff = j->prev->tail()[1] - val;
+	if( diff > 0.0 ) { 
+	    if( ccwTurn_tr( j->prev, j ) )
+		out.addarc( j );
+	    else
+		in.addarc( j );
+	} else if( diff < 0.0 ) {
+	    out.addarc( j );
+	} else {
+	    if( j->prev->tail()[0] > j->prev->head()[0] )
+		in.addarc( j );
+	    else
+		out.addarc( j );
+	}
+    }
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/jarcloc.h b/src/glu/sgi/libnurbs/internals/jarcloc.h
new file mode 100644
index 00000000000..faaf454a063
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/jarcloc.h
@@ -0,0 +1,93 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * jarcloc.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/jarcloc.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glujarcloc_h_
+#define __glujarcloc_h_
+
+#include "arc.h"
+
+class Jarcloc {
+private:
+    Arc_ptr 		arc;
+    TrimVertex		*p;
+    TrimVertex		*plast;
+public:
+    inline void		init( Arc_ptr a, long first, long last ) { arc = a; p=&a->pwlArc->pts[first]; plast = &a->pwlArc->pts[last]; }
+    inline TrimVertex *	getnextpt( void );
+    inline TrimVertex *	getprevpt( void );
+    inline void		reverse();
+};
+
+inline void
+Jarcloc::reverse()
+{
+    if( plast == &arc->pwlArc->pts[0] )
+	plast =  &arc->pwlArc->pts[arc->pwlArc->npts - 1];
+    else
+	plast =  &arc->pwlArc->pts[0];
+}
+
+inline TrimVertex *
+Jarcloc::getnextpt()
+{
+    assert( p <= plast );
+    if( p == plast ) {
+	arc = arc->next;
+	p = &arc->pwlArc->pts[0];
+	plast = &arc->pwlArc->pts[arc->pwlArc->npts - 1];
+	assert( p < plast );
+    }
+    return p++;
+}
+	
+inline TrimVertex *
+Jarcloc::getprevpt()
+{
+    assert( p >= plast );
+    if( p == plast ) {
+	arc = arc->prev;
+	p = &arc->pwlArc->pts[arc->pwlArc->npts - 1];
+	plast = &arc->pwlArc->pts[0];
+	assert( p > plast );
+    }
+    return p--;
+}
+#endif /* __glujarcloc_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/knotvector.cc b/src/glu/sgi/libnurbs/internals/knotvector.cc
new file mode 100644
index 00000000000..50556f622dd
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/knotvector.cc
@@ -0,0 +1,139 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * knotvector.c++
+ *
+ */
+
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "knotvector.h"
+#include "defines.h"
+
+#ifdef __WATCOMC__
+#pragma warning 726 10
+#endif
+
+void Knotvector::init( long _knotcount, long _stride, long _order, INREAL *_knotlist )
+{
+    knotcount = _knotcount;
+    stride = _stride;
+    order = _order;
+    knotlist = new Knot[_knotcount];
+    assert( knotlist != 0 );
+
+    for( int i = 0; i != _knotcount; i++ )
+	knotlist[i] = (Knot) _knotlist[i];
+}
+
+Knotvector::Knotvector( void )
+{
+    knotlist = 0;
+}
+
+Knotvector::~Knotvector( void )
+{
+    if( knotlist ) delete[] knotlist;
+}
+
+int Knotvector::validate( void )
+{
+   /* kindex is used as an array index so subtract one first,
+     * this propagates throughout the code so study carefully */
+    long	kindex = knotcount-1;
+
+    if( order < 1 || order > MAXORDER ) {
+	// spline order un-supported
+	return( 1 );
+    }
+
+    if( knotcount < (2 * order) ) {
+	// too few knots
+	return( 2 );
+    }
+
+    if( identical( knotlist[kindex-(order-1)], knotlist[order-1]) ) {
+	// valid knot range is empty
+	return( 3 );
+    }
+
+    for( long i = 0; i < kindex; i++)
+	if( knotlist[i] > knotlist[i+1] ) {
+	    // decreasing knot sequence
+	    return( 4 );
+	}
+        
+    /* check for valid multiplicity */
+
+    /*	kindex is currently the index of the last knot.
+     *	In the next loop  it is decremented to ignore the last knot
+     *	and the loop stops when kindex	is 2 so as to ignore the first
+     *	knot as well.  These knots are not used in computing
+     *	knot multiplicities.
+     */
+
+    long multi = 1;
+    for( ; kindex >= 1; kindex-- ) {
+	if( knotlist[kindex] - knotlist[kindex-1] < TOLERANCE ) {
+	    multi++;
+	    continue;
+	}
+	if ( multi > order ) {
+	    // knot multiplicity greater than order of spline
+	    return( 5 );
+	}
+	multi = 1;
+    }
+
+    if ( multi > order ) {
+	// knot multiplicity greater than order of spline
+	return( 5 );
+    }
+
+    return 0;
+}
+
+void Knotvector::show( char *msg )
+{
+#ifndef NDEBUG
+    dprintf( "%s\n", msg );
+    dprintf( "order = %ld, count = %ld\n", order, knotcount );
+
+    for( int i=0; i<knotcount; i++ )
+	dprintf( "knot[%d] = %g\n", i, knotlist[i] );
+#endif
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/knotvector.h b/src/glu/sgi/libnurbs/internals/knotvector.h
new file mode 100644
index 00000000000..eee6424a50b
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/knotvector.h
@@ -0,0 +1,68 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * knotvector.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/knotvector.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __gluknotvector_h_
+#define __gluknotvector_h_
+
+#include "types.h"
+
+struct Knotvector { /* a knot vector */
+			Knotvector( void );
+			~Knotvector( void );
+    void		init( long, long, long, INREAL * );
+    int			validate( void );
+    void 		show( char * );
+
+    long		order;		/* order of spline  */
+    long		knotcount;	/* number of knots  */
+    long		stride;		/* bytes between points */
+    Knot *		knotlist;	/* global knot vector */
+};
+
+/* tolerance to test knot coincidence */
+#define TOLERANCE 		1.0e-5
+
+inline int 
+identical( Knot x, Knot y )
+{
+    return ((x-y) < TOLERANCE) ? 1 : 0;
+}
+#endif /* __gluknotvector_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/mapdesc.cc b/src/glu/sgi/libnurbs/internals/mapdesc.cc
new file mode 100644
index 00000000000..56fb8a63bea
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/mapdesc.cc
@@ -0,0 +1,843 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * mapdesc.c++
+ *
+ * $Date: 2001/11/29 16:16:55 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/mapdesc.cc,v 1.2 2001/11/29 16:16:55 kschultz Exp $
+ */
+
+#include <stdio.h>
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "mystring.h"
+#include "mymath.h"
+#include "backend.h"
+#include "nurbsconsts.h"
+#include "mapdesc.h"
+
+Mapdesc::Mapdesc( long _type, int _israt, int _ncoords, Backend& b ) 
+    : backend( b )
+{
+    type 		= _type;
+    isrational 		= _israt;
+    ncoords 		= _ncoords;
+    hcoords		= _ncoords + (_israt ? 0 : 1 );
+    inhcoords		= _ncoords - (_israt ? 1 : 0 );
+    mask 		= ((1<<(inhcoords*2))-1);
+    next		= 0;
+
+    assert( hcoords <= MAXCOORDS );
+    assert( inhcoords >= 1 );
+
+    pixel_tolerance 	= 1.0;
+    error_tolerance	= 1.0;
+    bbox_subdividing	= N_NOBBOXSUBDIVISION;
+    culling_method 	= N_NOCULLING;		
+    sampling_method 	= N_NOSAMPLING;
+    clampfactor 	= N_NOCLAMPING;
+    minsavings 		= N_NOSAVINGSSUBDIVISION;
+    s_steps  		= 0.0;
+    t_steps 		= 0.0;
+    maxrate 		= ( s_steps < 0.0 ) ? 0.0 : s_steps;
+    maxsrate 		= ( s_steps < 0.0 ) ? 0.0 : s_steps;
+    maxtrate 		= ( t_steps < 0.0 ) ? 0.0 : t_steps;
+    identify( bmat );
+    identify( cmat );
+    identify( smat );
+    for( int i = 0; i != inhcoords; i++ )
+	bboxsize[i] = 1.0;
+}
+
+void
+Mapdesc::setBboxsize( INREAL *mat )
+{
+    for( int i = 0; i != inhcoords; i++ )
+	bboxsize[i] = (REAL) mat[i];
+}
+
+void
+Mapdesc::identify( REAL dest[MAXCOORDS][MAXCOORDS] )
+{
+    memset( dest, 0, sizeof( dest ) );
+    for( int i=0; i != hcoords; i++ )
+	dest[i][i] = 1.0;
+}
+
+void
+Mapdesc::surfbbox( REAL bb[2][MAXCOORDS] )
+{
+    backend.surfbbox( type, bb[0], bb[1] );
+}
+
+void 
+Mapdesc::copy( REAL dest[MAXCOORDS][MAXCOORDS], long n, INREAL *src,
+	long rstride, long cstride )
+{
+    assert( n >= 0 );
+    for( int i=0; i != n; i++ )
+        for( int j=0; j != n; j++ )
+	    dest[i][j] = src[i*rstride + j*cstride];
+}
+
+/*--------------------------------------------------------------------------
+ * copyPt - copy a homogeneous point
+ *--------------------------------------------------------------------------
+ */
+void
+Mapdesc::copyPt( REAL *d, REAL *s )
+{
+    assert( hcoords > 0 );
+    switch( hcoords  ) {
+	case 4: 
+	    d[3] = s[3];
+	    d[2] = s[2];
+	    d[1] = s[1];
+	    d[0] = s[0];
+	    break;
+	case 3: 
+	    d[2] = s[2];
+	    d[1] = s[1];
+	    d[0] = s[0];
+	    break;
+	case 2: 
+	    d[1] = s[1];
+	    d[0] = s[0];
+	    break;
+	case 1: 
+	    d[0] = s[0];
+	    break;
+	case 5: 
+	    d[4] = s[4];
+	    d[3] = s[3];
+	    d[2] = s[2];
+	    d[1] = s[1];
+	    d[0] = s[0];
+	    break;
+	default:
+	    memcpy( d, s, hcoords * sizeof( REAL ) );
+	    break;
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * sumPt - compute affine combination of two homogeneous points
+ *--------------------------------------------------------------------------
+ */
+void
+Mapdesc::sumPt( REAL *dst, REAL *src1, REAL *src2, register REAL alpha, register REAL beta )
+{
+    assert( hcoords > 0 );
+    switch( hcoords  ) {
+	case 4: 
+	    dst[3] = src1[3] * alpha + src2[3] * beta;
+	    dst[2] = src1[2] * alpha + src2[2] * beta;
+	    dst[1] = src1[1] * alpha + src2[1] * beta;
+	    dst[0] = src1[0] * alpha + src2[0] * beta;
+	    break;
+	case 3: 
+	    dst[2] = src1[2] * alpha + src2[2] * beta;
+	    dst[1] = src1[1] * alpha + src2[1] * beta;
+	    dst[0] = src1[0] * alpha + src2[0] * beta;
+	    break;
+	case 2: 
+	    dst[1] = src1[1] * alpha + src2[1] * beta;
+	    dst[0] = src1[0] * alpha + src2[0] * beta;
+	    break;
+	case 1: 
+	    dst[0] = src1[0] * alpha + src2[0] * beta;
+	    break;
+	case 5: 
+	    dst[4] = src1[4] * alpha + src2[4] * beta;
+	    dst[3] = src1[3] * alpha + src2[3] * beta;
+	    dst[2] = src1[2] * alpha + src2[2] * beta;
+	    dst[1] = src1[1] * alpha + src2[1] * beta;
+	    dst[0] = src1[0] * alpha + src2[0] * beta;
+	    break;
+	default: {
+		for( int i = 0; i != hcoords; i++ )
+		    dst[i] = src1[i] * alpha + src2[i] * beta;
+            }
+	    break;
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * clipbits - compute bit-vector indicating point/window position
+ *		       of a (transformed) homogeneous point
+ *--------------------------------------------------------------------------
+ */
+unsigned int
+Mapdesc::clipbits( REAL *p )
+{
+    assert( inhcoords >= 0 );
+    assert( inhcoords <= 3 );
+
+    register int nc = inhcoords;
+    register REAL pw = p[nc];
+    register REAL nw = -pw;
+    register unsigned int bits = 0;
+
+    if( pw == 0.0 ) return mask;
+
+    if( pw > 0.0 ) {
+	switch( nc ) {
+	case 3:
+	    if( p[2] <= pw ) bits |= (1<<5);
+	    if( p[2] >= nw ) bits |= (1<<4);
+	    if( p[1] <= pw ) bits |= (1<<3);
+	    if( p[1] >= nw ) bits |= (1<<2);
+	    if( p[0] <= pw ) bits |= (1<<1);
+	    if( p[0] >= nw ) bits |= (1<<0);
+            return bits;
+	case 2:
+	    if( p[1] <= pw ) bits |= (1<<3);
+	    if( p[1] >= nw ) bits |= (1<<2);
+	    if( p[0] <= pw ) bits |= (1<<1);
+	    if( p[0] >= nw ) bits |= (1<<0);
+            return bits;
+	case 1:
+	    if( p[0] <= pw ) bits |= (1<<1);
+	    if( p[0] >= nw ) bits |= (1<<0);
+            return bits;
+	default: {
+		int bit = 1;
+		for( int i=0; i<nc; i++ ) {
+		    if( p[i] >= nw ) bits |= bit; 
+		    bit <<= 1;
+		    if( p[i] <= pw ) bits |= bit; 
+		    bit <<= 1;
+		}
+		abort();
+		break;
+	    }
+	}
+    } else { 
+	switch( nc ) {
+	case 3:
+	    if( p[2] <= nw ) bits |= (1<<5);
+	    if( p[2] >= pw ) bits |= (1<<4);
+	    if( p[1] <= nw ) bits |= (1<<3);
+	    if( p[1] >= pw ) bits |= (1<<2);
+	    if( p[0] <= nw ) bits |= (1<<1);
+	    if( p[0] >= pw ) bits |= (1<<0);
+            return bits;
+	case 2:
+	    if( p[1] <= nw ) bits |= (1<<3);
+	    if( p[1] >= pw ) bits |= (1<<2);
+	    if( p[0] <= nw ) bits |= (1<<1);
+	    if( p[0] >= pw ) bits |= (1<<0);
+            return bits;
+	case 1:
+	    if( p[0] <= nw ) bits |= (1<<1);
+	    if( p[0] >= pw ) bits |= (1<<0);
+            return bits;
+	default: {
+		int bit = 1; 
+		for( int i=0; i<nc; i++ ) {
+		    if( p[i] >= pw ) bits |= bit; 
+		    bit <<= 1;
+		    if( p[i] <= nw ) bits |= bit; 
+		    bit <<= 1;
+		}
+		abort();
+		break;
+	    }
+	}
+    }
+    return bits;
+}
+
+/*--------------------------------------------------------------------------
+ * xformRational - transform a homogeneous point
+ *--------------------------------------------------------------------------
+ */
+void
+Mapdesc::xformRational( Maxmatrix mat, REAL *d, REAL *s )
+{
+    assert( hcoords >= 0 );
+
+    if( hcoords == 3 ) {
+	REAL x = s[0];
+	REAL y = s[1];
+	REAL z = s[2];
+	d[0] = x*mat[0][0]+y*mat[1][0]+z*mat[2][0];
+	d[1] = x*mat[0][1]+y*mat[1][1]+z*mat[2][1];
+	d[2] = x*mat[0][2]+y*mat[1][2]+z*mat[2][2];
+    } else if( hcoords == 4 ) {
+	REAL x = s[0];
+	REAL y = s[1];
+	REAL z = s[2];
+	REAL w = s[3];
+	d[0] = x*mat[0][0]+y*mat[1][0]+z*mat[2][0]+w*mat[3][0];
+	d[1] = x*mat[0][1]+y*mat[1][1]+z*mat[2][1]+w*mat[3][1];
+	d[2] = x*mat[0][2]+y*mat[1][2]+z*mat[2][2]+w*mat[3][2];
+	d[3] = x*mat[0][3]+y*mat[1][3]+z*mat[2][3]+w*mat[3][3];
+    } else {
+	for( int i=0; i != hcoords; i++ ) {
+	    d[i] = 0;
+	    for( int j = 0; j != hcoords; j++ )
+		d[i] += s[j] * mat[j][i];
+	}
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * xformNonrational - transform a inhomogeneous point to a homogeneous point
+ *--------------------------------------------------------------------------
+ */
+void
+Mapdesc::xformNonrational( Maxmatrix mat, REAL *d, REAL *s )
+{
+    if( inhcoords == 2 ) {
+	REAL x = s[0];
+	REAL y = s[1];
+	d[0] = x*mat[0][0]+y*mat[1][0]+mat[2][0];
+	d[1] = x*mat[0][1]+y*mat[1][1]+mat[2][1];
+	d[2] = x*mat[0][2]+y*mat[1][2]+mat[2][2];
+    } else if( inhcoords == 3 ) {
+	REAL x = s[0];
+	REAL y = s[1];
+	REAL z = s[2];
+	d[0] = x*mat[0][0]+y*mat[1][0]+z*mat[2][0]+mat[3][0];
+	d[1] = x*mat[0][1]+y*mat[1][1]+z*mat[2][1]+mat[3][1];
+	d[2] = x*mat[0][2]+y*mat[1][2]+z*mat[2][2]+mat[3][2];
+	d[3] = x*mat[0][3]+y*mat[1][3]+z*mat[2][3]+mat[3][3];
+    } else {
+        assert( inhcoords >= 0 );
+	for( int i=0; i != hcoords; i++ ) {
+	    d[i] = mat[inhcoords][i];
+	    for( int j = 0; j < inhcoords; j++ )
+		d[i] += s[j] * mat[j][i];
+	}
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * xformAndCullCheck - transform a set of points that may be EITHER 
+ *	homogeneous or inhomogeneous depending on the map description and
+ *	check if they are either completely inside, completely outside, 
+ *	or intersecting the viewing frustrum.
+ *--------------------------------------------------------------------------
+ */
+int
+Mapdesc::xformAndCullCheck( 
+    REAL *pts, int uorder, int ustride, int vorder, int vstride )
+{
+    assert( uorder > 0 );
+    assert( vorder > 0 );
+
+    unsigned int inbits = mask;
+    unsigned int outbits = 0;
+
+    REAL *p = pts;
+    for( REAL *pend = p + uorder * ustride; p != pend; p += ustride ) {
+        REAL *q = p;
+        for( REAL *qend = q + vorder * vstride; q != qend; q += vstride ) {
+    	    REAL cpts[MAXCOORDS];
+	    xformCulling( cpts, q );
+	    unsigned int bits = clipbits( cpts );
+	    outbits |= bits;
+	    inbits &= bits;
+	    if( ( outbits == (unsigned int)mask ) && ( inbits != (unsigned int)mask ) ) return CULL_ACCEPT;
+	} 
+    }
+
+    if( outbits != (unsigned int)mask ) {
+	return CULL_TRIVIAL_REJECT;
+    } else if( inbits == (unsigned int)mask ) {
+	return CULL_TRIVIAL_ACCEPT;
+    } else {
+	return CULL_ACCEPT;
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * cullCheck - check if a set of homogeneous transformed points are 
+ *	either completely inside, completely outside, 
+ *	or intersecting the viewing frustrum.
+ *--------------------------------------------------------------------------
+ */
+int
+Mapdesc::cullCheck( REAL *pts, int uorder, int ustride, int vorder, int vstride )
+{
+    unsigned int inbits = mask;
+    unsigned int outbits  = 0;
+
+    REAL *p = pts;
+    for( REAL *pend = p + uorder * ustride; p != pend; p += ustride ) {
+        REAL *q = p;
+        for( REAL *qend = q + vorder * vstride; q != qend; q += vstride ) {
+	    unsigned int bits = clipbits( q );
+	    outbits |= bits;
+	    inbits &= bits;
+	    if( ( outbits == (unsigned int)mask ) && ( inbits != (unsigned int)mask ) ) return CULL_ACCEPT;
+	} 
+    }
+
+    if( outbits != (unsigned int)mask ) {
+	return CULL_TRIVIAL_REJECT;
+    } else if( inbits == (unsigned int)mask ) {
+	return CULL_TRIVIAL_ACCEPT;
+    } else {
+	return CULL_ACCEPT;
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * cullCheck - check if a set of homogeneous transformed points are 
+ *	either completely inside, completely outside, 
+ *	or intersecting the viewing frustrum.
+ *--------------------------------------------------------------------------
+ */
+int
+Mapdesc::cullCheck( REAL *pts, int order, int stride )
+{
+    unsigned int inbits = mask;
+    unsigned int outbits  = 0;
+
+    REAL *p = pts;
+    for( REAL *pend = p + order * stride; p != pend; p += stride ) {
+	unsigned int bits = clipbits( p );
+	outbits |= bits;
+	inbits &= bits;
+	if( ( outbits == (unsigned int)mask ) && ( inbits != (unsigned int)mask ) ) return CULL_ACCEPT;
+    }
+
+    if( outbits != (unsigned int)mask ) {
+	return CULL_TRIVIAL_REJECT;
+    } else if( inbits == (unsigned int)mask ) {
+	return CULL_TRIVIAL_ACCEPT;
+    } else {
+	return CULL_ACCEPT;
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * xformSampling - transform a set of points that may be EITHER 
+ *	homogeneous or inhomogeneous depending on the map description 
+ *	into sampling space 
+ *--------------------------------------------------------------------------
+ */
+void
+Mapdesc::xformSampling( REAL *pts, int order, int stride, REAL *sp, int outstride )
+{
+    xformMat( smat, pts, order, stride, sp, outstride );
+}
+
+void
+Mapdesc::xformBounding( REAL *pts, int order, int stride, REAL *sp, int outstride )
+{
+    xformMat( bmat, pts, order, stride, sp, outstride );
+}
+
+/*--------------------------------------------------------------------------
+ * xformCulling - transform a set of points that may be EITHER 
+ *	homogeneous or inhomogeneous depending on the map description 
+ *	into culling space 
+ *--------------------------------------------------------------------------
+ */
+void
+Mapdesc::xformCulling( REAL *pts, int order, int stride, REAL *cp, int outstride )
+{
+    xformMat( cmat, pts, order, stride, cp, outstride );
+}
+
+/*--------------------------------------------------------------------------
+ * xformCulling - transform a set of points that may be EITHER 
+ *	homogeneous or inhomogeneous depending on the map description 
+ *	into culling space 
+ *--------------------------------------------------------------------------
+ */
+void
+Mapdesc::xformCulling( REAL *pts, 
+    int uorder, int ustride,
+    int vorder, int vstride, 
+    REAL *cp, int outustride, int outvstride )
+{
+    xformMat( cmat, pts, uorder, ustride, vorder, vstride, cp, outustride, outvstride );
+}
+
+/*--------------------------------------------------------------------------
+ * xformSampling - transform a set of points that may be EITHER 
+ *	homogeneous or inhomogeneous depending on the map description 
+ *	into sampling space 
+ *--------------------------------------------------------------------------
+ */
+void
+Mapdesc::xformSampling( REAL *pts, 
+    int uorder, int ustride, 
+    int vorder, int vstride, 
+    REAL *sp, int outustride, int outvstride )
+{
+    xformMat( smat, pts, uorder, ustride, vorder, vstride, sp, outustride, outvstride );
+}
+
+void
+Mapdesc::xformBounding( REAL *pts, 
+    int uorder, int ustride, 
+    int vorder, int vstride, 
+    REAL *sp, int outustride, int outvstride )
+{
+    xformMat( bmat, pts, uorder, ustride, vorder, vstride, sp, outustride, outvstride );
+}
+
+void
+Mapdesc::xformMat( 
+    Maxmatrix	mat, 
+    REAL *	pts, 
+    int 	order, 
+    int 	stride,
+    REAL *	cp, 
+    int 	outstride )
+{
+    if( isrational ) {
+	REAL *pend = pts + order * stride;
+	for( REAL *p = pts ; p != pend; p += stride ) {
+	    xformRational( mat, cp, p );
+	    cp += outstride;
+	}       
+    } else {
+	REAL *pend = pts + order * stride;
+	for( REAL *p = pts ; p != pend; p += stride ) {
+	    xformNonrational( mat, cp, p );
+	    cp += outstride;
+	}	
+    }
+}
+
+void
+Mapdesc::xformMat( Maxmatrix mat, REAL *pts, 
+    int uorder, int ustride, 
+    int vorder, int vstride, 
+    REAL *cp, int outustride, int outvstride )
+{
+    if( isrational ) {
+	REAL *pend = pts + uorder * ustride;
+	for( REAL *p = pts ; p != pend; p += ustride ) {
+	    REAL *cpts2 = cp;
+	    REAL *qend = p + vorder * vstride;
+	    for( REAL *q = p; q != qend; q += vstride ) {
+		xformRational( mat, cpts2, q );
+		cpts2 += outvstride;
+	    } 
+	    cp += outustride;
+	}
+    } else {
+	REAL *pend = pts + uorder * ustride;
+	for( REAL *p = pts ; p != pend; p += ustride ) {
+	    REAL *cpts2 = cp;
+	    REAL *qend = p + vorder * vstride;
+	    for( REAL *q = p; q != qend; q += vstride ) {
+		xformNonrational( mat, cpts2, q );
+		cpts2 += outvstride;
+	    } 
+	    cp += outustride;
+	}
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * subdivide - subdivide a curve along an isoparametric line
+ *--------------------------------------------------------------------------
+ */
+
+void
+Mapdesc::subdivide( REAL *src, REAL *dst, REAL v, int stride, int order )
+{
+    REAL mv = 1.0 - v;
+
+    for( REAL *send=src+stride*order; src!=send; send-=stride, dst+=stride ) {
+	copyPt( dst, src );
+	REAL *qpnt = src + stride;
+	for( REAL *qp=src; qpnt!=send; qp=qpnt, qpnt+=stride )
+	    sumPt( qp, qp, qpnt, mv, v );
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * subdivide - subdivide a patch along an isoparametric line
+ *--------------------------------------------------------------------------
+ */
+
+void
+Mapdesc::subdivide( REAL *src, REAL *dst, REAL v, 
+    int so, int ss, int to, int ts  )
+{
+    REAL mv = 1.0 - v;
+
+    for( REAL *slast = src+ss*so; src != slast; src += ss, dst += ss ) {
+	REAL *sp = src;
+	REAL *dp = dst;
+        for( REAL *send = src+ts*to; sp != send; send -= ts, dp += ts ) {
+	    copyPt( dp, sp );
+	    REAL *qp = sp;
+	    for( REAL *qpnt = sp+ts; qpnt != send; qp = qpnt, qpnt += ts )
+	        sumPt( qp, qp, qpnt, mv, v );
+	}
+    }
+}
+
+
+#define sign(x)	((x > 0) ? 1 : ((x < 0.0) ? -1 : 0))
+
+/*--------------------------------------------------------------------------
+ * project - project a set of homogeneous coordinates into inhomogeneous ones
+ *--------------------------------------------------------------------------
+ */
+int
+Mapdesc::project( REAL *src, int rstride, int cstride, 
+	          REAL *dest, int trstride, int tcstride,
+		  int nrows, int ncols )
+{
+    int s = sign( src[inhcoords] );
+    REAL *rlast = src + nrows * rstride;
+    REAL *trptr = dest;
+    for( REAL *rptr=src; rptr != rlast; rptr+=rstride, trptr+=trstride ) {
+	REAL *clast = rptr + ncols * cstride;
+	REAL *tcptr = trptr;
+	for( REAL *cptr = rptr; cptr != clast; cptr+=cstride, tcptr+=tcstride ) {
+	    REAL *coordlast = cptr + inhcoords;
+	    if( sign( *coordlast ) != s ) return 0;
+	    REAL *tcoord = tcptr;
+	    for( REAL *coord = cptr; coord != coordlast; coord++, tcoord++ ) {
+		*tcoord = *coord / *coordlast;
+	    }
+	}
+    }
+    return 1;
+}
+
+/*--------------------------------------------------------------------------
+ * project - project a set of homogeneous coordinates into inhomogeneous ones
+ *--------------------------------------------------------------------------
+ */
+int
+Mapdesc::project( REAL *src, int stride, REAL *dest, int tstride, int ncols )
+{
+    int s = sign( src[inhcoords] );
+
+    REAL *clast = src + ncols * stride;
+    for( REAL *cptr = src, *tcptr = dest; cptr != clast; cptr+=stride, tcptr+=tstride ) {
+	REAL *coordlast = cptr + inhcoords;
+	if( sign( *coordlast ) != s ) return 0;
+	for( REAL *coord = cptr, *tcoord = tcptr; coord != coordlast; coord++, tcoord++ ) 
+	    *tcoord = *coord / *coordlast;
+    }
+
+    return 1;
+}
+
+int
+Mapdesc::bboxTooBig( 
+    REAL *p, 
+    int	 rstride,
+    int	 cstride,
+    int	 nrows,
+    int	 ncols,
+    REAL bb[2][MAXCOORDS] )
+{
+    REAL bbpts[MAXORDER][MAXORDER][MAXCOORDS];
+    const int trstride = sizeof(bbpts[0]) / sizeof(REAL);
+    const int tcstride = sizeof(bbpts[0][0]) / sizeof(REAL); 
+
+    // points have been transformed, therefore they are homogeneous
+    // project points
+    int val = project( p, rstride, cstride, 
+	     &bbpts[0][0][0], trstride, tcstride, nrows, ncols );
+    if( val == 0 ) return -1;
+
+    // compute bounding box
+    bbox( bb, &bbpts[0][0][0], trstride, tcstride, nrows, ncols );
+
+    // find out if bounding box can't fit in unit cube
+    if( bbox_subdividing == N_BBOXROUND ) {
+	for( int k=0; k != inhcoords; k++ )
+	    if( ceilf(bb[1][k]) - floorf(bb[0][k]) > bboxsize[k] ) return 1;
+    } else {
+	for( int k=0; k != inhcoords; k++ )
+	    if( bb[1][k] - bb[0][k] > bboxsize[k] ) return 1;
+    }
+    return 0;  
+}
+
+void
+Mapdesc::bbox( 
+    REAL bb[2][MAXCOORDS], 
+    REAL *p, 
+    int	 rstride,
+    int	 cstride,
+    int	 nrows,
+    int	 ncols )
+{
+    int k;
+    for( k=0; k != inhcoords; k++ )
+	 bb[0][k] = bb[1][k] = p[k];
+
+    for( int i=0; i != nrows; i++ ) 
+	for( int j=0; j != ncols; j++ ) 
+	    for( k=0; k != inhcoords; k++ ) {
+		REAL x = p[i*rstride + j*cstride + k];
+		if(  x < bb[0][k] ) bb[0][k] = x;
+		else if( x > bb[1][k] ) bb[1][k] = x;
+	    }
+}
+
+/*--------------------------------------------------------------------------
+ * calcVelocityRational - calculate upper bound on first partial derivative 
+ *	of a homogeneous set of points and bounds on each row of points.
+ *--------------------------------------------------------------------------
+ */
+REAL
+Mapdesc::calcVelocityRational( REAL *p, int stride, int ncols )
+{
+    REAL tmp[MAXORDER][MAXCOORDS];
+
+    assert( ncols <= MAXORDER );
+
+    const int tstride = sizeof(tmp[0]) / sizeof(REAL); 
+
+    if( project( p, stride, &tmp[0][0], tstride, ncols ) ) {
+	return calcPartialVelocity( &tmp[0][0], tstride, ncols, 1, 1.0 );
+    } else { /* XXX */
+	return calcPartialVelocity( &tmp[0][0], tstride, ncols, 1, 1.0 );
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * calcVelocityNonrational - calculate upper bound on  first partial 
+ *	derivative of a inhomogeneous set of points.
+ *--------------------------------------------------------------------------
+ */
+REAL
+Mapdesc::calcVelocityNonrational( REAL *pts, int stride, int ncols )
+{
+    return calcPartialVelocity( pts, stride, ncols, 1, 1.0 );
+}
+
+int
+Mapdesc::isProperty( long property )
+{
+    switch ( property ) {
+	case N_PIXEL_TOLERANCE:
+	case N_ERROR_TOLERANCE:
+	case N_CULLING:
+	case N_BBOX_SUBDIVIDING:
+	case N_S_STEPS:
+	case N_T_STEPS:
+        case N_SAMPLINGMETHOD:
+        case N_CLAMPFACTOR:
+        case N_MINSAVINGS:
+	    return 1;
+	default:
+	    return 0;
+    }
+}
+
+REAL
+Mapdesc::getProperty( long property )
+{
+    switch ( property ) {
+	case N_PIXEL_TOLERANCE:
+	    return pixel_tolerance;
+	case N_ERROR_TOLERANCE:
+	    return error_tolerance;
+	case N_CULLING:
+	    return culling_method;
+	case N_BBOX_SUBDIVIDING:
+	    return bbox_subdividing;
+	case N_S_STEPS:
+	    return s_steps;
+	case N_T_STEPS:
+	    return t_steps;
+        case N_SAMPLINGMETHOD:
+	    return sampling_method;
+        case N_CLAMPFACTOR:
+	    return clampfactor;
+        case N_MINSAVINGS:
+	    return minsavings;
+	default:
+	    abort();
+	    return -1; //not necessary, needed to shut up compiler
+    }
+}
+
+void
+Mapdesc::setProperty( long property, REAL value )
+{
+
+    switch ( property ) {
+	case N_PIXEL_TOLERANCE:
+	    pixel_tolerance = value;
+	    break;
+	case N_ERROR_TOLERANCE:
+	    error_tolerance = value;
+	    break;
+	case N_CULLING:
+	    culling_method = value;
+	    break;
+	case N_BBOX_SUBDIVIDING:
+	    if( value <= 0.0 ) value = N_NOBBOXSUBDIVISION;
+	    bbox_subdividing = value;
+	    break;
+	case N_S_STEPS:
+	    if( value < 0.0 ) value = 0.0;
+	    s_steps = value;
+	    maxrate = ( value < 0.0 ) ? 0.0 : value;
+	    maxsrate = ( value < 0.0 ) ? 0.0 : value;
+	    break;
+	case N_T_STEPS:
+	    if( value < 0.0 ) value = 0.0;
+	    t_steps = value;
+	    maxtrate = ( value < 0.0 ) ? 0.0 : value;
+	    break;
+	case N_SAMPLINGMETHOD:
+	    sampling_method = value;
+	    break;
+	case N_CLAMPFACTOR:
+	    if( value <= 0.0 ) value = N_NOCLAMPING;
+	    clampfactor = value;
+	    break;
+	case N_MINSAVINGS:
+	    if( value <= 0.0 ) value = N_NOSAVINGSSUBDIVISION;
+	    minsavings = value;
+	    break;
+	default:
+	    abort();
+	    break;
+    }
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/mapdesc.h b/src/glu/sgi/libnurbs/internals/mapdesc.h
new file mode 100644
index 00000000000..ac4c476e963
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/mapdesc.h
@@ -0,0 +1,277 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * mapdesc.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/mapdesc.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glumapdesc_h_
+#define __glumapdesc_h_
+
+#include "mystdio.h"
+#include "types.h"
+#include "defines.h"
+#include "bufpool.h"
+#include "nurbsconsts.h"
+
+typedef REAL Maxmatrix[MAXCOORDS][MAXCOORDS];
+
+class Backend;
+
+class Mapdesc : public PooledObj {
+    friend class Maplist;
+			
+public:
+    			Mapdesc( long, int, int, Backend & );
+    int			isProperty( long );
+    REAL		getProperty( long );
+    void		setProperty( long, REAL );
+    int			isConstantSampling( void );
+    int			isDomainSampling( void );
+    int			isRangeSampling( void );
+    int			isSampling( void );
+    int			isParametricDistanceSampling( void );
+    int			isObjectSpaceParaSampling( void );
+    int			isObjectSpacePathSampling( void );
+    int			isSurfaceAreaSampling( void );
+    int			isPathLengthSampling( void );
+    int			isCulling( void );
+    int			isBboxSubdividing( void );
+    long		getType( void );
+
+    /* curve routines */
+    void		subdivide( REAL *, REAL *, REAL, int, int );
+    int 		cullCheck( REAL *, int, int );
+    void		xformBounding( REAL *, int, int, REAL *, int );
+    void		xformCulling( REAL *, int, int, REAL *, int );
+    void		xformSampling( REAL *, int, int, REAL *, int );
+    void		xformMat( Maxmatrix, REAL *, int, int, REAL *, int );
+    REAL		calcPartialVelocity ( REAL *, int, int, int, REAL );
+    int			project( REAL *, int, REAL *, int, int );
+    REAL		calcVelocityRational( REAL *, int, int );
+    REAL		calcVelocityNonrational( REAL *, int, int );
+
+    /* surface routines */
+    void		subdivide( REAL *, REAL *, REAL, int, int, int, int );
+    int 		cullCheck( REAL *, int, int, int, int );
+    void		xformBounding( REAL *, int, int, int, int, REAL *, int, int );
+    void		xformCulling( REAL *, int, int, int, int, REAL *, int, int );
+    void		xformSampling( REAL *, int, int, int, int, REAL *, int, int );
+    void		xformMat( Maxmatrix, REAL *, int, int, int, int, REAL *, int, int );
+    REAL		calcPartialVelocity ( REAL *, REAL *, int, int, int, int, int, int, REAL, REAL, int );
+    int 		project( REAL *, int, int, REAL *, int, int, int, int);
+    void		surfbbox( REAL bb[2][MAXCOORDS] );
+
+    int			bboxTooBig( REAL *, int, int, int, int, REAL [2][MAXCOORDS] );
+    int 		xformAndCullCheck( REAL *, int, int, int, int );
+
+    void		identify( REAL[MAXCOORDS][MAXCOORDS] );
+    void		setBboxsize( INREAL *);
+    inline void 	setBmat( INREAL*, long, long );
+    inline void 	setCmat( INREAL*, long, long );
+    inline void 	setSmat( INREAL*, long, long );
+    inline int		isRational( void );
+    inline int		getNcoords( void );
+
+    REAL 		pixel_tolerance;    /* pathlength sampling tolerance */
+    REAL		error_tolerance;    /* parametric error sampling tolerance*/
+    REAL		object_space_error_tolerance;    /* object space tess*/
+    REAL 		clampfactor;
+    REAL 		minsavings;
+    REAL		maxrate;
+    REAL		maxsrate;
+    REAL		maxtrate;
+    REAL		bboxsize[MAXCOORDS];
+
+private:
+    long 		type;
+    int 		isrational;
+    int 		ncoords;
+    int 		hcoords;
+    int 		inhcoords;
+    int			mask;
+    Maxmatrix 		bmat;
+    Maxmatrix 		cmat;
+    Maxmatrix 		smat;
+    REAL 		s_steps;		/* max samples in s direction */
+    REAL 		t_steps;		/* max samples in t direction */
+    REAL 		sampling_method;	
+    REAL 		culling_method;		/* check for culling */
+    REAL		bbox_subdividing;
+    Mapdesc *		next;
+    Backend &		backend;
+
+    void		bbox( REAL [2][MAXCOORDS], REAL *, int, int, int, int );
+    REAL		maxDifference( int, REAL *, int );
+    static void 	copy( Maxmatrix, long, INREAL *, long, long );
+
+    /* individual control point routines */
+    static void		transform4d( float[4], float[4], float[4][4] );
+    static void		multmatrix4d ( float[4][4], const float[4][4],
+					 const float[4][4] );
+    void		copyPt( REAL *, REAL * );
+    void		sumPt( REAL *, REAL *, REAL *, REAL, REAL );
+    void		xformSampling( REAL *, REAL * );
+    void		xformCulling( REAL *, REAL * );
+    void		xformRational( Maxmatrix, REAL *, REAL * );
+    void		xformNonrational( Maxmatrix, REAL *, REAL * );
+    unsigned int	clipbits( REAL * );
+};
+
+inline void
+Mapdesc::setBmat( INREAL *mat, long rstride, long cstride )
+{
+    copy( bmat, hcoords, mat, rstride, cstride );
+}
+
+inline void
+Mapdesc::setCmat( INREAL *mat, long rstride, long cstride )
+{
+    copy( cmat, hcoords, mat, rstride, cstride );
+}
+
+inline void
+Mapdesc::setSmat( INREAL *mat, long rstride, long cstride )
+{
+    copy( smat, hcoords, mat, rstride, cstride );
+}
+
+inline long
+Mapdesc::getType( void )
+{
+    return type;
+}
+
+inline void
+Mapdesc::xformCulling( REAL *d, REAL *s )
+{
+    if( isrational )
+        xformRational( cmat, d, s );
+    else
+	xformNonrational( cmat, d, s );
+}
+
+inline void
+Mapdesc::xformSampling( REAL *d, REAL *s )
+{
+    if( isrational )
+        xformRational( smat, d, s );
+    else
+	xformNonrational( smat, d, s );
+}
+
+inline int 
+Mapdesc::isRational( void )
+{
+    return isrational ? 1 : 0;
+}
+
+inline int		
+Mapdesc::getNcoords( void ) 
+{
+    return ncoords; 
+}
+
+inline int			
+Mapdesc::isConstantSampling( void ) 
+{
+    return ((sampling_method == N_FIXEDRATE) ? 1 : 0); 
+}
+
+inline int			
+Mapdesc::isDomainSampling( void ) 
+{ 
+    return ((sampling_method == N_DOMAINDISTANCE) ? 1 : 0); 
+}
+
+inline int			
+Mapdesc::isParametricDistanceSampling( void ) 
+{
+    return ((sampling_method == N_PARAMETRICDISTANCE) ? 1 : 0);
+}
+
+inline int			
+Mapdesc::isObjectSpaceParaSampling( void ) 
+{
+    return ((sampling_method == N_OBJECTSPACE_PARA) ? 1 : 0);
+}
+
+inline int			
+Mapdesc::isObjectSpacePathSampling( void ) 
+{
+    return ((sampling_method == N_OBJECTSPACE_PATH) ? 1 : 0);
+}
+
+inline int			
+Mapdesc::isSurfaceAreaSampling( void ) 
+{
+    return ((sampling_method == N_SURFACEAREA) ? 1 : 0);
+}
+
+inline int			
+Mapdesc::isPathLengthSampling( void ) 
+{
+    return ((sampling_method == N_PATHLENGTH) ? 1 : 0);
+}
+
+inline int			
+Mapdesc::isRangeSampling( void ) 
+{
+    return ( isParametricDistanceSampling() || isPathLengthSampling() ||
+	    isSurfaceAreaSampling() ||
+	    isObjectSpaceParaSampling() ||
+	    isObjectSpacePathSampling());
+}
+
+inline int
+Mapdesc::isSampling( void )
+{
+    return isRangeSampling() || isConstantSampling() || isDomainSampling();
+}
+
+inline int			
+Mapdesc::isCulling( void ) 
+{
+    return ((culling_method != N_NOCULLING) ? 1 : 0);
+}
+
+inline int			
+Mapdesc::isBboxSubdividing( void ) 
+{
+    return ((bbox_subdividing != N_NOBBOXSUBDIVISION) ? 1 : 0);
+}
+#endif /* __glumapdesc_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/mapdescv.cc b/src/glu/sgi/libnurbs/internals/mapdescv.cc
new file mode 100644
index 00000000000..380bcfe171f
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/mapdescv.cc
@@ -0,0 +1,245 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * mapdescv.c++
+ *
+ * $Date: 2004/05/12 15:29:36 $ $Revision: 1.3 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/mapdescv.cc,v 1.3 2004/05/12 15:29:36 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "mystring.h"
+#include "mymath.h"
+#include "nurbsconsts.h"
+#include "mapdesc.h"
+
+/*--------------------------------------------------------------------------
+ * calcPartialVelocity - calculate maximum magnitude of a given partial
+ * derivative
+ *--------------------------------------------------------------------------
+ */
+REAL
+Mapdesc::calcPartialVelocity (
+    REAL *p,
+    int	 stride,
+    int	 ncols,
+    int  partial,
+    REAL range )
+{
+    REAL tmp[MAXORDER][MAXCOORDS];
+    REAL mag[MAXORDER];
+
+    assert( ncols <= MAXORDER );
+
+    int j, k, t;
+    // copy inhomogeneous control points into temporary array
+    for( j=0; j != ncols; j++ ) 
+	for( k=0; k != inhcoords; k++ )
+	    tmp[j][k] = p[j*stride + k];
+
+    for( t=0; t != partial; t++ ) 
+	for( j=0; j != ncols-t-1; j++ ) 
+	    for( k=0; k != inhcoords; k++ ) 
+		tmp[j][k] = tmp[j+1][k] - tmp[j][k];
+
+    // compute magnitude and store in mag array
+    for( j=0; j != ncols-partial; j++ ) {
+	mag[j] = 0.0;
+	for( k=0; k != inhcoords; k++ )
+	    mag[j] += tmp[j][k] * tmp[j][k];
+    }
+
+    // compute scale factor
+    REAL fac = 1;
+    REAL invt = 1.0 / range;
+    for( t = ncols-1; t != ncols-1-partial; t-- ) 
+	fac *= t * invt;
+
+    // compute max magnitude of all entries in array
+    REAL max = 0.0;
+    for( j=0; j != ncols-partial; j++ )
+	if( mag[j] > max ) max = mag[j];
+    max = fac * sqrtf( (float) max );
+
+    return max;
+}
+
+/*--------------------------------------------------------------------------
+ * calcPartialVelocity - calculate maximum magnitude of a given partial
+ * derivative
+ *--------------------------------------------------------------------------
+ */
+REAL
+Mapdesc::calcPartialVelocity (
+    REAL *dist,
+    REAL *p,
+    int	 rstride,
+    int	 cstride,
+    int	 nrows,
+    int	 ncols,
+    int  spartial,
+    int  tpartial,
+    REAL srange, 
+    REAL trange,
+    int  side )
+{
+    REAL tmp[MAXORDER][MAXORDER][MAXCOORDS];
+    REAL mag[MAXORDER][MAXORDER];
+
+    assert( nrows <= MAXORDER );
+    assert( ncols <= MAXORDER );
+
+    REAL *tp = &tmp[0][0][0];
+    REAL *mp = &mag[0][0];
+    const int istride = sizeof( tmp[0]) / sizeof( tmp[0][0][0] );
+    const int jstride = sizeof( tmp[0][0]) / sizeof( tmp[0][0][0] );
+    /*
+    const int kstride = sizeof( tmp[0][0][0]) / sizeof( tmp[0][0][0] );
+    */
+    const int mistride = sizeof( mag[0]) / sizeof( mag[0][0] );
+    const int mjstride = sizeof( mag[0][0]) / sizeof( mag[0][0] );
+    const int idist = nrows * istride;
+    const int jdist = ncols * jstride;
+    /*
+    const int kdist = inhcoords * kstride;
+    */
+    const int id = idist - spartial * istride;
+    const int jd = jdist - tpartial * jstride;
+
+    {
+	// copy control points
+	REAL *ti = tp;
+	REAL *qi = p;
+	REAL *til = tp + idist;
+	for( ; ti != til; ) {
+	    REAL *tj = ti;
+	    REAL *qj = qi;
+	    REAL *tjl = ti + jdist;
+	    for( ; tj != tjl;  ) {
+		for( int k=0; k != inhcoords; k++ ) {
+		    tj[k] = qj[k];
+		}
+		tj += jstride;
+		qj += cstride;
+	    }
+	    ti += istride;
+	    qi += rstride; 
+	}
+    }
+
+    {
+        // compute (s)-partial derivative control points
+	REAL *til = tp + idist - istride;
+	const REAL *till = til - ( spartial * istride );
+	for( ; til != till; til -= istride )
+	    for( REAL *ti = tp; ti != til; ti += istride )
+		for( REAL *tj = ti, *tjl = tj + jdist; tj != tjl; tj += jstride )
+		    for( int k=0; k != inhcoords; k++ )
+			tj[k] = tj[k+istride] - tj[k];
+    }
+
+    {
+        // compute (s,t)-partial derivative control points
+	REAL *tjl = tp + jdist - jstride;
+	const REAL *tjll = tjl - ( tpartial * jstride );
+	for( ; tjl != tjll; tjl -= jstride )
+	    for( REAL *tj = tp; tj != tjl; tj += jstride )
+		for( REAL *ti = tj, *til = ti + id; ti != til; ti += istride )
+		    for( int k=0; k != inhcoords; k++ ) 
+			ti[k] = ti[k+jstride] - ti[k];
+
+    }
+
+    REAL max = 0.0;
+    {
+	// compute magnitude and store in mag array
+	memset( (void *) mp, 0, sizeof( mag ) );
+	for( REAL *ti = tp, *mi = mp, *til = tp + id; ti != til; ti += istride, mi += mistride )
+	    for( REAL *tj = ti, *mj = mi, *tjl = ti + jd; tj != tjl; tj += jstride, mj += mjstride ) {
+		for( int k=0; k != inhcoords; k++ )
+		   *mj += tj[k] * tj[k];
+		if( *mj > max ) max = *mj;
+	    }
+
+    }
+
+    int i, j;
+
+    // compute scale factor
+    REAL fac = 1.0;
+    {
+	REAL invs = 1.0 / srange;
+	REAL invt = 1.0 / trange;
+	for( int s = nrows-1, slast = s-spartial; s != slast; s-- ) 
+	    fac *= s * invs;
+	for( int t = ncols-1, tlast = t-tpartial; t != tlast; t-- ) 
+	    fac *= t * invt;
+    }
+
+    if( side == 0 ) {
+	// compute max magnitude of first and last column
+	dist[0] = 0.0;
+	dist[1] = 0.0;
+	for( i=0; i != nrows-spartial; i++ ) {
+	    j = 0;
+	    if( mag[i][j] > dist[0] ) dist[0] = mag[i][j];
+    
+	    j = ncols-tpartial-1;
+	    if( mag[i][j] > dist[1] ) dist[1] = mag[i][j];
+	}
+	dist[0] = fac * sqrtf( dist[0] );
+	dist[1] = fac * sqrtf( dist[1] );
+    } else if( side == 1 ) {
+	// compute max magnitude of first and last row
+	dist[0] = 0.0;
+	dist[1] = 0.0;
+	for( j=0; j != ncols-tpartial; j++ ) {
+	    i = 0;
+	    if( mag[i][j] > dist[0] ) dist[0] = mag[i][j];
+    
+	    i = nrows-spartial-1;
+	    if( mag[i][j] > dist[1] ) dist[1] = mag[i][j];
+	}
+	dist[0] = fac * sqrtf( dist[0] );
+	dist[1] = fac * sqrtf( dist[1] );
+    }
+
+    max = fac * sqrtf( (float) max );
+
+    return max;
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/maplist.cc b/src/glu/sgi/libnurbs/internals/maplist.cc
new file mode 100644
index 00000000000..803044ffd3f
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/maplist.cc
@@ -0,0 +1,119 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * maplist.c++
+ *
+ * $Date: 2005/10/28 13:09:08 $ $Revision: 1.1.30.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/maplist.cc,v 1.1.30.1 2005/10/28 13:09:08 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "mymath.h"
+#include "nurbsconsts.h"
+#include "maplist.h"
+#include "mapdesc.h"
+#include "backend.h"
+ 
+Maplist::Maplist( Backend& b )
+    : mapdescPool( sizeof( Mapdesc ), 10, "mapdesc pool" ),
+      backend( b )
+{
+    maps = 0; lastmap = &maps;
+}
+
+void 
+Maplist::initialize( void )
+{
+    freeMaps();
+    define( N_P2D, 0, 2 );
+    define( N_P2DR, 1, 3 );
+}
+
+void 
+Maplist::add( long type, int israt, int ncoords )
+{
+    *lastmap = new(mapdescPool) Mapdesc( type, israt, ncoords, backend );
+    lastmap = &((*lastmap)->next);
+}
+
+void 
+Maplist::define( long type, int israt, int ncoords )
+{
+#ifndef NDEBUG // to avoid warning
+    Mapdesc *m = locate( type );
+    assert( m == NULL || ( m->isrational == israt && m->ncoords == ncoords ) );
+#endif
+    add( type, israt, ncoords );
+}
+
+void 
+Maplist::remove( Mapdesc *m )
+{
+    for( Mapdesc **curmap = &maps; *curmap; curmap = &((*curmap)->next) ) {
+	if( *curmap == m ) {
+	    *curmap = m->next;
+	    m->deleteMe( mapdescPool );
+	    return;
+	}
+    }
+    abort();
+}
+
+void
+Maplist::freeMaps( void )
+{
+    mapdescPool.clear();
+    maps = 0;
+    lastmap = &maps;
+}
+
+Mapdesc * 
+Maplist::find( long type )
+{
+    Mapdesc *val = locate( type );
+    assert( val != 0 );
+    return val;
+}
+
+Mapdesc * 
+Maplist::locate( long type )
+{
+    Mapdesc *m;
+    for( m = maps; m; m = m->next )
+	if( m->getType() == type ) break;
+    return m;
+}
diff --git a/src/glu/sgi/libnurbs/internals/maplist.h b/src/glu/sgi/libnurbs/internals/maplist.h
new file mode 100644
index 00000000000..369120e9044
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/maplist.h
@@ -0,0 +1,87 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * maplist.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/maplist.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glumaplist_h_
+#define __glumaplist_h_
+
+#include "types.h"
+#include "defines.h"
+#include "bufpool.h"
+
+class Backend;
+class Mapdesc;
+
+class Maplist {
+public:
+			Maplist( Backend & );
+    void 		define( long, int, int );
+    inline void 	undefine( long );
+    inline int		isMap( long );
+
+    void 		initialize( void );
+    Mapdesc * 		find( long );
+    Mapdesc * 		locate( long );
+
+private:
+    Pool		mapdescPool;
+    Mapdesc *		maps;
+    Mapdesc **		lastmap;
+    Backend &		backend;
+
+    void 		add( long, int, int );
+    void 		remove( Mapdesc * );
+    void		freeMaps( void );
+};
+
+inline int
+Maplist::isMap( long type )
+{
+    return (locate( type ) ? 1 : 0);
+}
+
+inline void 
+Maplist::undefine( long type )
+{
+    Mapdesc *m = locate( type );
+    assert( m != 0 );
+    remove( m );
+}
+#endif /* __glumaplist_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/mesher.cc b/src/glu/sgi/libnurbs/internals/mesher.cc
new file mode 100644
index 00000000000..ca0c6617127
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/mesher.cc
@@ -0,0 +1,488 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * mesher.c++
+ *
+ * $Date: 2001/11/29 16:16:55 $ $Revision: 1.3 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/mesher.cc,v 1.3 2001/11/29 16:16:55 kschultz Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "gridvertex.h"
+#include "gridtrimvertex.h"
+#include "jarcloc.h"
+#include "gridline.h"
+#include "trimline.h"
+#include "uarray.h"
+#include "backend.h"
+#include "mesher.h"
+
+
+const float Mesher::ZERO = 0.0;
+
+Mesher::Mesher( Backend& b ) 
+	: backend( b ), 
+	p( sizeof( GridTrimVertex ), 100, "GridTrimVertexPool" )
+{
+    stacksize = 0;
+    vdata = 0;
+    lastedge = 0; //needed to prevent purify UMR 
+}
+
+Mesher::~Mesher( void )
+{
+    if( vdata ) delete[] vdata;
+}
+
+void 
+Mesher::init( unsigned int npts )
+{
+    p.clear();
+    if( stacksize < npts ) {
+	stacksize = 2 * npts;
+	if( vdata ) delete[] vdata;		
+	vdata = new GridTrimVertex_p[stacksize];
+    } 
+}
+
+inline void
+Mesher::push( GridTrimVertex *gt )
+{
+    assert( itop+1 != (int)stacksize );
+    vdata[++itop] = gt;
+}
+
+inline void
+Mesher::pop( long )
+{
+}
+
+inline void
+Mesher::openMesh()
+{
+    backend.bgntmesh( "addedge" );
+}
+
+inline void
+Mesher::closeMesh()
+{
+    backend.endtmesh();
+}
+
+inline void
+Mesher::swapMesh()
+{
+    backend.swaptmesh();
+}
+
+inline void
+Mesher::clearStack()
+{
+    itop = -1;
+    last[0] = 0;
+}
+
+void
+Mesher::finishLower( GridTrimVertex *gtlower )
+{
+    for( push(gtlower); 
+	 nextlower( gtlower=new(p) GridTrimVertex ); 
+	 push(gtlower) ) 
+	    addLower();
+    addLast();
+}
+
+void
+Mesher::finishUpper( GridTrimVertex *gtupper )
+{
+    for( push(gtupper); 
+	 nextupper( gtupper=new(p) GridTrimVertex ); 
+	 push(gtupper) ) 
+	    addUpper();
+    addLast();
+}
+
+void
+Mesher::mesh( void )
+{
+    GridTrimVertex *gtlower, *gtupper;
+
+    Hull::init( );
+    nextupper( gtupper = new(p) GridTrimVertex );
+    nextlower( gtlower = new(p) GridTrimVertex );
+
+    clearStack();
+    openMesh();
+    push(gtupper);
+
+    nextupper( gtupper = new(p) GridTrimVertex );
+    nextlower( gtlower );
+
+    assert( gtupper->t && gtlower->t );
+    
+    if( gtupper->t->param[0] < gtlower->t->param[0] ) {
+	push(gtupper);
+	lastedge = 1;
+	if( nextupper( gtupper=new(p) GridTrimVertex ) == 0 ) {
+	    finishLower(gtlower);
+	    return;
+	}
+    } else if( gtupper->t->param[0] > gtlower->t->param[0] ) {
+	push(gtlower);
+	lastedge = 0;
+	if( nextlower( gtlower=new(p) GridTrimVertex ) == 0 ) {
+	    finishUpper(gtupper);
+	    return;
+	}
+    } else {
+	if( lastedge == 0 ) {
+	    push(gtupper);
+	    lastedge = 1;
+	    if( nextupper(gtupper=new(p) GridTrimVertex) == 0 ) {
+		finishLower(gtlower);
+		return;
+	    }
+	} else {
+	    push(gtlower);
+	    lastedge = 0;
+	    if( nextlower( gtlower=new(p) GridTrimVertex ) == 0 ) {
+		finishUpper(gtupper);
+		return;
+	    }
+	}
+    }
+
+    while ( 1 ) {
+	if( gtupper->t->param[0] < gtlower->t->param[0] ) {
+            push(gtupper);
+	    addUpper();
+	    if( nextupper( gtupper=new(p) GridTrimVertex ) == 0 ) {
+		finishLower(gtlower);
+		return;
+	    }
+	} else if( gtupper->t->param[0] > gtlower->t->param[0] ) {
+    	    push(gtlower);
+	    addLower();
+	    if( nextlower( gtlower=new(p) GridTrimVertex ) == 0 ) {
+		finishUpper(gtupper);
+		return;
+	    }
+	} else {
+	    if( lastedge == 0 ) {
+		push(gtupper);
+		addUpper();
+		if( nextupper( gtupper=new(p) GridTrimVertex ) == 0 ) {
+		    finishLower(gtlower);
+		    return;
+		}
+	    } else {
+		push(gtlower);
+		addLower();
+		if( nextlower( gtlower=new(p) GridTrimVertex ) == 0 ) {
+		    finishUpper(gtupper);
+		    return;
+		}
+	    }
+	}
+    }
+}
+
+inline int
+Mesher::isCcw( int ilast )
+{
+    REAL area = det3( vdata[ilast]->t, vdata[itop-1]->t, vdata[itop-2]->t );
+    return (area < ZERO) ? 0 : 1;
+}
+
+inline int
+Mesher::isCw( int ilast  )
+{
+    REAL area = det3( vdata[ilast]->t, vdata[itop-1]->t, vdata[itop-2]->t );
+    return (area > -ZERO) ? 0 : 1;
+}
+
+inline int
+Mesher::equal( int x, int y )
+{
+    return( last[0] == vdata[x] && last[1] == vdata[y] );
+}
+
+inline void
+Mesher::copy( int x, int y )
+{
+    last[0] = vdata[x]; last[1] = vdata[y];
+}
+ 
+inline void
+Mesher::move( int x, int y ) 
+{
+    vdata[x] = vdata[y];
+}
+
+inline void
+Mesher::output( int x )
+{
+    backend.tmeshvert( vdata[x] );
+}
+
+/*---------------------------------------------------------------------------
+ * addedge - addedge an edge to the triangulation
+ *
+ *	This code has been re-written to generate large triangle meshes
+ *	from a monotone polygon.  Although smaller triangle meshes
+ *	could be generated faster and with less code, larger meshes
+ *	actually give better SYSTEM performance.  This is because
+ *	vertices are processed in the backend slower than they are
+ *	generated by this code and any decrease in the number of vertices
+ *	results in a decrease in the time spent in the backend.
+ *---------------------------------------------------------------------------
+ */
+
+void
+Mesher::addLast( )
+{
+    register int ilast = itop;
+
+    if( lastedge == 0 ) {
+	if( equal( 0, 1 ) ) {
+	    output( ilast );
+	    swapMesh();
+	    for( register int i = 2; i < ilast; i++ ) {
+		swapMesh();
+		output( i );
+	    }
+	    copy( ilast, ilast-1 );
+	} else if( equal( ilast-2, ilast-1) ) {
+	    swapMesh();
+	    output( ilast );
+	    for( register int i = ilast-3; i >= 0; i-- ) {
+		output( i );
+		swapMesh();
+	    }
+	    copy( 0, ilast );
+	} else {
+	    closeMesh();	openMesh();
+	    output( ilast );
+	    output( 0 );
+	    for( register int i = 1; i < ilast; i++ ) {
+		swapMesh();
+		output( i );
+	    }
+	    copy( ilast, ilast-1 );
+	}
+    } else {
+	if( equal( 1, 0) ) {
+	    swapMesh();
+	    output( ilast );
+	    for( register int i = 2; i < ilast; i++ ) {
+		output( i );
+		swapMesh();
+	    }
+	    copy( ilast-1, ilast );
+	} else if( equal( ilast-1, ilast-2) ) {
+	    output( ilast );
+	    swapMesh();
+	    for( register int i = ilast-3; i >= 0; i-- ) {
+		swapMesh();
+		output( i );
+	    }
+	    copy( ilast, 0 );
+	} else {
+	    closeMesh();	openMesh();
+	    output( 0 );
+	    output( ilast );
+	    for( register int i = 1; i < ilast; i++ ) {
+		output( i );
+		swapMesh();
+	    }
+	    copy( ilast-1, ilast );
+	}
+    }
+    closeMesh();
+    //for( register long k=0; k<=ilast; k++ ) pop( k );
+}
+
+void
+Mesher::addUpper( )
+{
+    register int ilast = itop;
+
+    if( lastedge == 0 ) {
+	if( equal( 0, 1 ) ) {
+	    output( ilast );
+	    swapMesh();
+	    for( register int i = 2; i < ilast; i++ ) {
+		swapMesh();
+		output( i );
+	    }
+	    copy( ilast, ilast-1 );
+	} else if( equal( ilast-2, ilast-1) ) {
+	    swapMesh();
+	    output( ilast );
+	    for( register int i = ilast-3; i >= 0; i-- ) {
+		output( i );
+		swapMesh();
+	    }
+	    copy( 0, ilast );
+	} else {
+	    closeMesh();	openMesh();
+	    output( ilast );
+	    output( 0 );
+	    for( register int i = 1; i < ilast; i++ ) {
+		swapMesh();
+		output( i );
+	    }
+	    copy( ilast, ilast-1 );
+	}
+	lastedge = 1;
+        //for( register long k=0; k<ilast-1; k++ ) pop( k );
+	move( 0, ilast-1 );
+	move( 1, ilast );
+	itop = 1;
+    } else {
+	if( ! isCcw( ilast ) ) return;
+	do {
+	    itop--;
+	} while( (itop > 1) && isCcw( ilast ) );
+
+	if( equal( ilast-1, ilast-2 ) ) {
+	    output( ilast );
+	    swapMesh();
+	    for( register int i=ilast-3; i>=itop-1; i-- ) {
+		swapMesh();
+		output( i );
+	    }
+	    copy( ilast, itop-1 );
+	} else if( equal( itop, itop-1 ) ) {
+	    swapMesh();
+	    output( ilast );
+	    for( register int i = itop+1; i < ilast; i++ ) {
+		output( i );
+		swapMesh();
+	    }
+	    copy( ilast-1, ilast );
+	} else {
+	    closeMesh();	openMesh();
+	    output( ilast );
+	    output( ilast-1 );
+	    for( register int i=ilast-2; i>=itop-1; i-- ) {
+		swapMesh();
+		output( i );
+	    } 
+	    copy( ilast, itop-1 );
+	}
+        //for( register int k=itop; k<ilast; k++ ) pop( k );
+	move( itop, ilast );
+    }
+}
+
+void
+Mesher::addLower()
+{
+    register int ilast = itop;
+
+    if( lastedge == 1 ) {
+	if( equal( 1, 0) ) {
+	    swapMesh();
+	    output( ilast );
+	    for( register int i = 2; i < ilast; i++ ) {
+		output( i );
+		swapMesh();
+	    }
+	    copy( ilast-1, ilast );
+	} else if( equal( ilast-1, ilast-2) ) {
+	    output( ilast );
+	    swapMesh();
+	    for( register int i = ilast-3; i >= 0; i-- ) {
+		swapMesh();
+		output( i );
+	    }
+	    copy( ilast, 0 );
+	} else {
+	    closeMesh();	openMesh();
+	    output( 0 );
+	    output( ilast );
+	    for( register int i = 1; i < ilast; i++ ) {
+		output( i );
+		swapMesh();
+	    }
+	    copy( ilast-1, ilast );
+	}
+
+	lastedge = 0;
+        //for( register long k=0; k<ilast-1; k++ ) pop( k );
+	move( 0, ilast-1 );
+	move( 1, ilast );
+	itop = 1;
+    } else {
+	if( ! isCw( ilast ) ) return;
+	do {
+	    itop--;
+	} while( (itop > 1) && isCw( ilast ) );
+
+	if( equal( ilast-2, ilast-1) ) {
+	    swapMesh();
+	    output( ilast );
+	    for( register int i=ilast-3; i>=itop-1; i--) {
+		output( i );
+		swapMesh( );
+	    }
+	    copy( itop-1, ilast );
+	} else if( equal( itop-1, itop) ) {
+	    output( ilast );
+	    swapMesh();
+	    for( register int i=itop+1; i<ilast; i++ ) {
+		swapMesh( );
+		output( i );
+	    }
+	    copy( ilast, ilast-1 );
+	} else {
+	    closeMesh();	openMesh();
+	    output( ilast-1 );
+	    output( ilast );
+	    for( register int i=ilast-2; i>=itop-1; i-- ) {
+		output( i );
+		swapMesh( );
+	    }
+	    copy( itop-1, ilast );
+	}
+        //for( register int k=itop; k<ilast; k++ ) pop( k );
+	move( itop, ilast );
+    }
+}
+
+
diff --git a/src/glu/sgi/libnurbs/internals/mesher.h b/src/glu/sgi/libnurbs/internals/mesher.h
new file mode 100644
index 00000000000..c96db73b4aa
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/mesher.h
@@ -0,0 +1,89 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * mesher.h
+ *
+ * $Date: 2001/08/07 17:34:11 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/mesher.h,v 1.2 2001/08/07 17:34:11 brianp Exp $
+ */
+
+#ifndef __glumesher_h_
+#define __glumesher_h_
+
+#include "hull.h"
+
+class TrimRegion;
+class Backend;
+class Pool;
+// struct GridTrimVertex;
+
+
+class Mesher : virtual public TrimRegion, public Hull {
+public:
+     			Mesher( Backend & );
+			~Mesher( void );
+    void		init( unsigned int );
+    void		mesh( void );
+
+private:
+    static const float	ZERO;
+    Backend&		backend;
+
+    Pool		p;
+    unsigned int	stacksize;
+    GridTrimVertex **	vdata;
+    GridTrimVertex *	last[2];
+    int			itop;
+    int			lastedge;
+
+    inline void		openMesh( void );
+    inline void		swapMesh( void );
+    inline void		closeMesh( void );
+    inline int		isCcw( int );
+    inline int		isCw( int );
+    inline void		clearStack( void );
+    inline void		push( GridTrimVertex * );
+    inline void		pop( long );
+    inline void		move( int, int );
+    inline int 		equal( int, int );
+    inline void 	copy( int, int );
+    inline void 	output( int );
+    void		addUpper( void );
+    void		addLower( void );
+    void		addLast( void );
+    void		finishUpper( GridTrimVertex * );
+    void		finishLower( GridTrimVertex * );
+};
+#endif /* __glumesher_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/monoTriangulationBackend.cc b/src/glu/sgi/libnurbs/internals/monoTriangulationBackend.cc
new file mode 100644
index 00000000000..19e87b99db3
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/monoTriangulationBackend.cc
@@ -0,0 +1,399 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+** 
+** http://oss.sgi.com/projects/FreeB
+** 
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+** 
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+** 
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+**
+** $Date: 2005/10/28 13:09:08 $ $Revision: 1.2.8.1 $
+*/
+/*
+** $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/monoTriangulationBackend.cc,v 1.2.8.1 2005/10/28 13:09:08 brianp Exp $
+*/
+
+#include "monoTriangulation.h"
+#include "polyUtil.h"
+#include "backend.h"
+#include "arc.h"
+
+void reflexChain::outputFan(Real v[2], Backend* backend)
+{
+  Int i;
+  /*
+  TrimVertex trimVert;
+  */
+  backend->bgntfan();
+
+  /*
+  trimVert.param[0]=v[0];
+  trimVert.param[1]=v[1];
+  backend->tmeshvert(&trimVert);
+  */
+  backend->tmeshvert(v[0], v[1]);
+
+  if(isIncreasing) {
+    for(i=0; i<index_queue; i++)
+      {
+	/*
+	trimVert.param[0]=queue[i][0];
+	trimVert.param[1]=queue[i][1];
+	backend->tmeshvert(&trimVert);
+	*/
+	backend->tmeshvert(queue[i][0], queue[i][1]);
+      }
+  }
+  else {
+    for(i=index_queue-1; i>=0; i--)
+      {
+	/*
+	trimVert.param[0]=queue[i][0];
+	trimVert.param[1]=queue[i][1];
+	backend->tmeshvert(&trimVert);
+	*/
+	backend->tmeshvert(queue[i][0], queue[i][1]);
+      }
+  }
+  backend->endtfan();
+}
+
+void reflexChain::processNewVertex(Real v[2], Backend* backend)
+{
+  Int i,j,k;
+  Int isReflex;
+  /*TrimVertex trimVert;*/
+  /*if there are at most one vertex in the queue, then simply insert
+   */
+  if(index_queue <=1){
+    insert(v);
+    return;
+  }
+  
+  /*there are at least two vertices in the queue*/
+  j=index_queue-1;
+  
+  for(i=j; i>=1; i--) {
+    if(isIncreasing) {
+      isReflex = (area(queue[i-1], queue[i], v) <= 0.0);
+    }
+    else /*decreasing*/{
+      isReflex = (area(v, queue[i], queue[i-1]) <= 0.0);	  
+    }
+    if(isReflex) {
+      break;
+    }
+  }
+
+  /*
+   *if i<j then vertices: i+1--j are convex
+   * output triangle fan: 
+   *  v, and queue[i], i+1, ..., j
+   */
+  if(i<j) 
+    {
+      backend->bgntfan();
+      /*
+      trimVert.param[0]=v[0];
+      trimVert.param[1]=v[1];
+      backend->tmeshvert(& trimVert);
+      */
+      backend->tmeshvert(v[0], v[1]);
+
+      if(isIncreasing) {
+	for(k=i; k<=j; k++)
+	  {
+	    /*
+	    trimVert.param[0]=queue[k][0];
+	    trimVert.param[1]=queue[k][1];
+	    backend->tmeshvert(& trimVert);
+	    */
+	    backend->tmeshvert(queue[k][0], queue[k][1]);
+	  }
+      }
+      else {
+	for(k=j; k>=i; k--)
+	  {
+	    /*
+	    trimVert.param[0]=queue[k][0];
+	    trimVert.param[1]=queue[k][1];
+	    backend->tmeshvert(& trimVert);
+	    */
+	    backend->tmeshvert(queue[k][0], queue[k][1]);
+	  }
+      }
+      
+      backend->endtfan();
+    }
+
+  /*delete vertices i+1--j from the queue*/
+  index_queue = i+1;
+  /*finally insert v at the end of the queue*/
+  insert(v);
+
+}
+
+
+void monoTriangulationRec(Real* topVertex, Real* botVertex, 
+			  vertexArray* inc_chain, Int inc_current,
+			  vertexArray* dec_chain, Int dec_current,
+			  Backend* backend)
+{
+  assert( inc_chain != NULL && dec_chain != NULL);
+  assert( ! (inc_current>=inc_chain->getNumElements() &&
+	     dec_current>=dec_chain->getNumElements()));
+  Int inc_nVertices;
+  Int dec_nVertices;
+  Real** inc_array ;
+  Real** dec_array ;
+  Int i;
+  assert( ! ( (inc_chain==NULL) && (dec_chain==NULL)));
+
+  if(inc_current>=inc_chain->getNumElements()) /*no more vertices on inc_chain*/
+    {
+
+      dec_array = dec_chain->getArray();
+      dec_nVertices = dec_chain->getNumElements();      
+      reflexChain rChain(20,0);
+      /*put the top vertex into the reflex chain*/
+      rChain.processNewVertex(topVertex, backend);
+      /*process all the vertices on the dec_chain*/
+      for(i=dec_current; i<dec_nVertices; i++){
+	rChain.processNewVertex(dec_array[i], backend);
+      }
+      /*process the bottom vertex*/
+      rChain.processNewVertex(botVertex, backend);
+
+    }
+  else if(dec_current>= dec_chain->getNumElements()) /*no more vertices on dec_chain*/
+    {
+      inc_array = inc_chain->getArray();
+      inc_nVertices= inc_chain->getNumElements();
+      reflexChain rChain(20,1);
+      /*put the top vertex into the reflex chain*/
+      rChain.processNewVertex(topVertex, backend);
+      /*process all the vertices on the inc_chain*/
+      for(i=inc_current; i<inc_nVertices; i++){
+	rChain.processNewVertex(inc_array[i], backend);
+      }
+      /*process the bottom vertex*/
+      rChain.processNewVertex(botVertex, backend);
+    }
+  else /*neither chain is empty*/
+    {
+      inc_array = inc_chain -> getArray();
+      dec_array = dec_chain -> getArray();
+      inc_nVertices= inc_chain->getNumElements();
+      dec_nVertices= dec_chain->getNumElements();
+      /*if top of inc_chain is 'lower' than top of dec_chain, process all the 
+       *vertices on the dec_chain which are higher than top of inc_chain
+       */
+      if(compV2InY(inc_array[inc_current], dec_array[dec_current]) <= 0)
+	{
+
+	  reflexChain rChain(20, 0);
+	  rChain.processNewVertex(topVertex, backend);
+	  for(i=dec_current; i<dec_nVertices; i++)
+	    {
+	      if(compV2InY(inc_array[inc_current], dec_array[i]) <= 0)
+		rChain.processNewVertex(dec_array[i], backend);
+	      else 
+		break;
+	    }
+	  rChain.outputFan(inc_array[inc_current], backend);
+	  monoTriangulationRec(dec_array[i-1], botVertex, 
+			       inc_chain, inc_current,
+			       dec_chain, i,
+			       backend);
+	}
+      else /*compV2InY(inc_array[inc_current], dec_array[dec_current]) > 0*/
+	{
+
+	  reflexChain rChain(20, 1);
+	  rChain.processNewVertex(topVertex, backend);
+	  for(i=inc_current; i<inc_nVertices; i++)
+	    {
+	      if(compV2InY(inc_array[i], dec_array[dec_current]) >0)		
+		rChain.processNewVertex(inc_array[i], backend);	      
+	      else
+		break;
+	    }
+	  rChain.outputFan(dec_array[dec_current], backend);
+	  monoTriangulationRec(inc_array[i-1], botVertex, 
+			       inc_chain, i,
+			       dec_chain, dec_current,
+			       backend);
+	}
+    }/*end case neither is empty*/
+}
+
+
+void monoTriangulationFunBackend(Arc_ptr loop, Int (*compFun)(Real*, Real*), Backend* backend)
+{
+  Int i;
+  /*find the top vertex, bottom vertex, inccreasing chain, and decreasing chain,
+   *then call monoTriangulationRec
+   */
+  Arc_ptr tempV;
+  Arc_ptr topV;
+  Arc_ptr botV;
+  topV = botV = loop;
+  for(tempV = loop->next; tempV != loop; tempV = tempV->next)
+    {
+      if(compFun(topV->tail(), tempV->tail())<0) {
+	topV = tempV;
+      }
+      if(compFun(botV->tail(), tempV->tail())>0) {
+	botV = tempV;
+      }
+    }
+
+  /*creat increase and decrease chains*/
+  vertexArray inc_chain(20); /*this is a dynamic array*/
+  for(i=1; i<=topV->pwlArc->npts-2; i++) { /*the first vertex is the top vertex which doesn't belong to inc_chain*/
+    inc_chain.appendVertex(topV->pwlArc->pts[i].param);
+  }
+  for(tempV = topV->next; tempV != botV; tempV = tempV->next)
+    {
+      for(i=0; i<=tempV->pwlArc->npts-2; i++){
+	inc_chain.appendVertex(tempV->pwlArc->pts[i].param);
+      }
+    }
+  
+  vertexArray dec_chain(20);
+  for(tempV = topV->prev; tempV != botV; tempV = tempV->prev)
+    {
+      for(i=tempV->pwlArc->npts-2; i>=0; i--){
+	dec_chain.appendVertex(tempV->pwlArc->pts[i].param);
+      }
+    }
+  for(i=botV->pwlArc->npts-2; i>=1; i--){ 
+    dec_chain.appendVertex(tempV->pwlArc->pts[i].param);
+  }
+  
+  monoTriangulationRecFunBackend(topV->tail(), botV->tail(), &inc_chain, 0, &dec_chain, 0, compFun, backend);
+
+}  
+
+/*if compFun == compV2InY, top to bottom: V-monotone
+ *if compFun == compV2InX, right to left: U-monotone
+ */
+void monoTriangulationRecFunBackend(Real* topVertex, Real* botVertex, 
+			  vertexArray* inc_chain, Int inc_current,
+			  vertexArray* dec_chain, Int dec_current,
+			  Int  (*compFun)(Real*, Real*),
+			  Backend* backend)
+{
+  assert( inc_chain != NULL && dec_chain != NULL);
+  assert( ! (inc_current>=inc_chain->getNumElements() &&
+	     dec_current>=dec_chain->getNumElements()));
+  Int inc_nVertices;
+  Int dec_nVertices;
+  Real** inc_array ;
+  Real** dec_array ;
+  Int i;
+  assert( ! ( (inc_chain==NULL) && (dec_chain==NULL)));
+
+  if(inc_current>=inc_chain->getNumElements()) /*no more vertices on inc_chain*/
+    {
+
+      dec_array = dec_chain->getArray();
+      dec_nVertices = dec_chain->getNumElements();      
+      reflexChain rChain(20,0);
+      /*put the top vertex into the reflex chain*/
+      rChain.processNewVertex(topVertex, backend);
+      /*process all the vertices on the dec_chain*/
+      for(i=dec_current; i<dec_nVertices; i++){
+	rChain.processNewVertex(dec_array[i], backend);
+      }
+      /*process the bottom vertex*/
+      rChain.processNewVertex(botVertex, backend);
+
+    }
+  else if(dec_current>= dec_chain->getNumElements()) /*no more vertices on dec_chain*/
+    {
+      inc_array = inc_chain->getArray();
+      inc_nVertices= inc_chain->getNumElements();
+      reflexChain rChain(20,1);
+      /*put the top vertex into the reflex chain*/
+      rChain.processNewVertex(topVertex, backend);
+      /*process all the vertices on the inc_chain*/
+      for(i=inc_current; i<inc_nVertices; i++){
+	rChain.processNewVertex(inc_array[i], backend);
+      }
+      /*process the bottom vertex*/
+      rChain.processNewVertex(botVertex, backend);
+    }
+  else /*neither chain is empty*/
+    {
+      inc_array = inc_chain -> getArray();
+      dec_array = dec_chain -> getArray();
+      inc_nVertices= inc_chain->getNumElements();
+      dec_nVertices= dec_chain->getNumElements();
+      /*if top of inc_chain is 'lower' than top of dec_chain, process all the 
+       *vertices on the dec_chain which are higher than top of inc_chain
+       */
+      if(compFun(inc_array[inc_current], dec_array[dec_current]) <= 0)
+	{
+
+	  reflexChain rChain(20, 0);
+	  rChain.processNewVertex(topVertex, backend);
+	  for(i=dec_current; i<dec_nVertices; i++)
+	    {
+	      if(compFun(inc_array[inc_current], dec_array[i]) <= 0)
+		rChain.processNewVertex(dec_array[i], backend);
+	      else 
+		break;
+	    }
+	  rChain.outputFan(inc_array[inc_current], backend);
+	  monoTriangulationRecFunBackend(dec_array[i-1], botVertex, 
+			       inc_chain, inc_current,
+			       dec_chain, i,
+			       compFun,
+			       backend);
+	}
+      else /*compFun(inc_array[inc_current], dec_array[dec_current]) > 0*/
+	{
+
+	  reflexChain rChain(20, 1);
+	  rChain.processNewVertex(topVertex, backend);
+	  for(i=inc_current; i<inc_nVertices; i++)
+	    {
+	      if(compFun(inc_array[i], dec_array[dec_current]) >0)		
+		rChain.processNewVertex(inc_array[i], backend);	      
+	      else
+		break;
+	    }
+	  rChain.outputFan(dec_array[dec_current], backend);
+	  monoTriangulationRecFunBackend(inc_array[i-1], botVertex, 
+			       inc_chain, i,
+			       dec_chain, dec_current,
+			       compFun,
+			       backend);
+	}
+    }/*end case neither is empty*/
+}
diff --git a/src/glu/sgi/libnurbs/internals/monotonizer.cc b/src/glu/sgi/libnurbs/internals/monotonizer.cc
new file mode 100644
index 00000000000..b3bb61758d7
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/monotonizer.cc
@@ -0,0 +1,262 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * monotonizer.c++
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/monotonizer.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "arc.h"
+#include "arctess.h"
+#include "bezierarc.h"
+#include "bin.h"
+#include "mapdesc.h"
+#include "nurbsconsts.h"
+#include "subdivider.h"
+
+/*-----------------------------------------------------------------------------
+ * Subdivider::decompose - break all curves into monotone arcs
+ *-----------------------------------------------------------------------------
+ */
+int
+Subdivider::decompose( Bin& bin, REAL geo_stepsize )
+{
+    Arc_ptr jarc;
+    for( jarc=bin.firstarc(); jarc; jarc=bin.nextarc() ) {
+	if( ! jarc->isTessellated() ) {
+	    /* points have not been transformed, therefore they may be either
+	       homogeneous or inhomogeneous */
+	    tessellate( jarc, geo_stepsize );
+	    if( jarc->isDisconnected() || jarc->next->isDisconnected() ) 
+		return 1;
+	}
+    }
+
+    for( jarc=bin.firstarc(); jarc; jarc=bin.nextarc() ) {
+	monotonize( jarc, bin );
+    }
+
+#ifndef NDEBUG
+    for( jarc=bin.firstarc(); jarc; jarc=bin.nextarc() ) {
+	assert( isMonotone( jarc ) != 0 );
+    }
+#endif
+
+    return 0;
+}
+
+void
+Subdivider::tessellate( Arc_ptr jarc, REAL geo_stepsize )
+{
+    BezierArc *b = jarc->bezierArc;
+    Mapdesc *mapdesc = b->mapdesc;
+
+    if( mapdesc->isRational() ) {
+	REAL max = mapdesc->calcVelocityRational( b->cpts, b->stride, b->order );
+	REAL arc_stepsize = (max > 1.0) ? (1.0/max) : 1.0; 
+	if( jarc->bezierArc->order != 2 )
+	    arctessellator.tessellateNonlinear( jarc, geo_stepsize, arc_stepsize, 1 );
+	else {
+	    arctessellator.tessellateLinear( jarc, geo_stepsize, arc_stepsize, 1 );
+	}
+    } else { 
+	REAL max = mapdesc->calcVelocityNonrational( b->cpts, b->stride, b->order );
+	REAL arc_stepsize = (max > 1.0) ? (1.0/max) : 1.0; 
+	if( jarc->bezierArc->order != 2 )
+	    arctessellator.tessellateNonlinear( jarc, geo_stepsize, arc_stepsize, 0 );
+	else {
+	    arctessellator.tessellateLinear( jarc, geo_stepsize, arc_stepsize, 0 );
+	}
+    }
+}
+
+/*-------------------------------------------------------------------------
+ * Subdivider::monotonize - break up a jordan arc into s,t-monotone
+ *	components.  This code will remove degenerate segments, including
+ *	arcs of only a single point.
+ *-------------------------------------------------------------------------
+ */
+void
+Subdivider::monotonize( Arc_ptr jarc, Bin& bin )
+{
+    TrimVertex  *firstvert = jarc->pwlArc->pts;
+    TrimVertex  *lastvert = firstvert + (jarc->pwlArc->npts - 1);
+    long	uid = jarc->nuid;
+    arc_side	side = jarc->getside();
+    dir		sdir = none;
+    dir		tdir = none;
+    int 	degenerate = 1;
+
+    int		nudegenerate;
+    int		change;
+
+    TrimVertex *vert;
+    for( vert = firstvert; vert != lastvert; vert++ ) {
+
+        nudegenerate = 1;
+        change = 0;
+
+	/* check change relative to s axis, clear degenerate bit if needed */
+        REAL sdiff = vert[1].param[0] - vert[0].param[0]; 
+        if( sdiff == 0 ) {
+	    if( sdir != same ) {
+	        sdir = same;
+		change = 1;
+	    }
+        } else if( sdiff < 0.0 ) {
+	    if( sdir != down ) {
+	        sdir = down;
+		change = 1;
+	    }
+	    nudegenerate = 0;
+        } else {
+	    if( sdir != up ) {
+	        sdir = up;
+		change = 1;
+	    }
+	    nudegenerate = 0;
+        }
+    
+	/* check change relative to t axis, clear degenerate bit if needed */
+        REAL tdiff = vert[1].param[1] - vert[0].param[1]; 
+        if( tdiff == 0 ) { 
+	    if( tdir != same ) {
+	        tdir = same;
+	 	change = 1;
+	    }
+        } else if( tdiff < 0.0 ) {
+	    if( tdir != down ) {
+	        tdir = down;
+		change = 1;
+	    }
+	    nudegenerate = 0;
+        } else {
+	    if( tdir != up ) {
+	        tdir = up;
+		change = 1;
+	    }
+	    nudegenerate = 0;
+        }
+    
+	if( change ) {
+	    if( ! degenerate ) {
+	        /* make last segment into separate pwl curve */
+	        jarc->pwlArc->npts = vert - firstvert + 1;
+	        jarc = (new(arcpool) Arc( side, uid ))->append( jarc );
+	        jarc->pwlArc = new(pwlarcpool) PwlArc();
+		bin.addarc( jarc );
+	    }
+	    firstvert = jarc->pwlArc->pts = vert;
+	    degenerate = nudegenerate;
+	} 
+    }
+    jarc->pwlArc->npts = vert - firstvert + 1;
+
+    if( degenerate ) {
+	/* remove jarc from circularly linked list */
+	jarc->prev->next = jarc->next;
+	jarc->next->prev = jarc->prev;
+
+        assert( jarc->prev->check(  ) != 0 );
+        assert( jarc->next->check(  ) != 0 );
+
+	/* remove jarc from bin */
+	bin.remove_this_arc( jarc  );
+
+	jarc->pwlArc->deleteMe( pwlarcpool ); jarc->pwlArc = 0;
+	jarc->deleteMe( arcpool );
+    } 
+}
+
+/*-------------------------------------------------------------------------
+ * Subdivider::isMonotone - return true if arc is monotone AND non-degenerate
+ *-------------------------------------------------------------------------
+ */
+int
+Subdivider::isMonotone( Arc_ptr jarc )
+{
+    TrimVertex  *firstvert = jarc->pwlArc->pts;
+    TrimVertex  *lastvert = firstvert + (jarc->pwlArc->npts - 1);
+
+    if( firstvert == lastvert ) return 1;
+
+    TrimVertex	*vert = firstvert;
+    enum dir	sdir;
+    enum dir	tdir;
+
+    REAL diff = vert[1].param[0] - vert[0].param[0]; 
+    if( diff == 0.0 ) 
+        sdir = same;
+    else if( diff < 0.0 )
+        sdir = down;
+    else
+        sdir = up;
+
+    diff = vert[1].param[1] - vert[0].param[1]; 
+    if( diff == 0.0 ) 
+        tdir = same;
+    else if( diff < 0.0 )
+        tdir = down;
+    else
+        tdir = up;
+
+    if( (sdir == same) && (tdir == same) ) return 0;
+    
+    for( ++vert ; vert != lastvert; vert++ ) {
+        diff = vert[1].param[0] - vert[0].param[0]; 
+        if( diff == 0.0 ) {
+	    if( sdir != same ) return 0;
+        } else if( diff < 0.0 ) {
+	    if( sdir != down ) return 0;
+        } else {
+	    if( sdir != up ) return 0;
+        }
+
+        diff = vert[1].param[1] - vert[0].param[1]; 
+        if( diff == 0.0 ) {
+	    if( tdir != same ) return 0;
+        } else if( diff < 0.0 ) {
+	    if( tdir != down ) return 0;
+        } else {
+	    if( tdir != up ) return 0;
+        }
+    }
+    return 1;
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/monotonizer.h b/src/glu/sgi/libnurbs/internals/monotonizer.h
new file mode 100644
index 00000000000..f26c50e16ff
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/monotonizer.h
@@ -0,0 +1,47 @@
+/**************************************************************************
+ *									  *
+ * 		 Copyright (C) 1999, Silicon Graphics, Inc.		  *
+ *									  *
+ *  These coded instructions, statements, and computer programs  contain  *
+ *  unpublished  proprietary  information of Silicon Graphics, Inc., and  *
+ *  are protected by Federal copyright law.  They  may  not be disclosed  *
+ *  to  third  parties  or copied or duplicated in any form, in whole or  *
+ *  in part, without the prior written consent of Silicon Graphics, Inc.  *
+ *									  *
+ **************************************************************************/
+
+/*
+ * monotonizer.h
+ *
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/monotonizer.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glumonotonizer_h_
+#define __glumonotonizer_h_
+
+#include "mysetjmp.h"
+#include "types.h"
+
+class Arc;
+class ArcTessellator;
+class Pool;
+class Bin;
+class PwlArcPool;
+class Mapdesc;
+
+class Monotonizer {
+    ArcTessellator&	arctessellator;
+    Pool&		arcpool;
+    Pool&		pwlarcpool;
+    jmp_buf&		nurbsJmpBuf;
+
+    enum dir 		{ down, same, up, none };
+    void		tessellate( Arc *, REAL );
+    void		monotonize( Arc *, Bin & );
+    int			isMonotone( Arc * );
+public:
+    			Monotonizer( ArcTessellator& at, Pool& ap, Pool& p, jmp_buf& j ) 
+				: arctessellator(at), arcpool(ap), pwlarcpool(p), nurbsJmpBuf(j) {}
+    int			decompose( Bin &, REAL );
+};
+#endif /* __glumonotonizer_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/myassert.h b/src/glu/sgi/libnurbs/internals/myassert.h
new file mode 100644
index 00000000000..befc7fd8ade
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/myassert.h
@@ -0,0 +1,57 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * myassert.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/myassert.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glumyassert_h_
+#define __glumyassert_h_
+
+#ifdef STANDALONE
+#define assert(EX) ((void)0)
+#endif
+
+#ifdef LIBRARYBUILD
+#include <assert.h>
+#endif
+
+#ifdef GLBUILD
+#define assert(EX) ((void)0)
+#endif
+
+#endif /* __glumyassert_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/mycode.cc b/src/glu/sgi/libnurbs/internals/mycode.cc
new file mode 100644
index 00000000000..6d00c6d53a3
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/mycode.cc
@@ -0,0 +1,69 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+** 
+** http://oss.sgi.com/projects/FreeB
+** 
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+** 
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+** 
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+**
+** $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+*/
+/*
+** $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/mycode.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+*/
+
+#include "mymath.h"
+
+#ifdef NEEDCEILF
+
+float ceilf( float x )
+{
+   if( x < 0 ) {
+	float nx = -x;
+	int ix = (int) nx;
+	return (float) -ix;
+   } else {
+	int ix = (int) x;
+	if( x == (float) ix ) return x;
+	return (float) (ix+1);
+   }
+}
+
+float floorf( float x )
+{
+   if( x < 0 ) {
+	float nx = -x;
+	int ix = (int) nx;
+	if( nx == (float) ix ) return x;
+	return (float) -(ix+1);
+   } else {
+	int ix = (int) x;
+	return (float) ix;
+   }
+}
+#endif
diff --git a/src/glu/sgi/libnurbs/internals/mymath.h b/src/glu/sgi/libnurbs/internals/mymath.h
new file mode 100644
index 00000000000..73078251dda
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/mymath.h
@@ -0,0 +1,72 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * mymath.h
+ *
+ */
+
+#ifndef __glumymath_h_
+#define __glumymath_h_
+
+#ifdef GLBUILD
+#define sqrtf		gl_fsqrt
+#endif
+
+#if defined(GLBUILD) || defined(STANDALONE)
+#define M_SQRT2		1.41421356237309504880
+#define ceilf		myceilf
+#define floorf		myfloorf	
+#define sqrtf		sqrt
+extern "C" double	sqrt(double);
+extern "C" float	ceilf(float);
+extern "C" float	floorf(float);
+#define NEEDCEILF
+#endif
+
+#ifdef LIBRARYBUILD
+#include <math.h>
+#endif
+
+#if !defined sqrtf
+#    define sqrtf(x)    ((float)sqrt(x))
+#endif
+#if !defined ceilf
+#    define ceilf(x)    ((float)ceil(x))
+#endif
+#if !defined floorf
+#    define floorf(x)   ((float)floor(x))
+#endif
+
+#endif /* __glumymath_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/mysetjmp.h b/src/glu/sgi/libnurbs/internals/mysetjmp.h
new file mode 100644
index 00000000000..bfb9cea98ba
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/mysetjmp.h
@@ -0,0 +1,89 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * mysetjmp.h
+ *
+ */
+
+#ifndef __glumysetjmp_h_
+#define __glumysetjmp_h_
+
+#ifdef STANDALONE
+struct JumpBuffer;
+extern "C" JumpBuffer *newJumpbuffer( void );
+extern "C" void deleteJumpbuffer(JumpBuffer *);
+extern "C" void mylongjmp( JumpBuffer *, int );
+extern "C" int mysetjmp( JumpBuffer * );
+#endif
+
+#ifdef GLBUILD
+#define setjmp		gl_setjmp
+#define longjmp 	gl_longjmp
+#endif
+
+#if defined(LIBRARYBUILD) || defined(GLBUILD)
+#include <setjmp.h>
+#include <stdlib.h>
+
+struct JumpBuffer {
+    jmp_buf	buf;
+};
+
+inline JumpBuffer *
+newJumpbuffer( void )
+{
+    return (JumpBuffer *) malloc( sizeof( JumpBuffer ) );
+}
+
+inline void
+deleteJumpbuffer(JumpBuffer *jb)
+{
+   free( (void *) jb);
+}
+
+inline void
+mylongjmp( JumpBuffer *j, int code ) 
+{
+    ::longjmp( j->buf, code );
+}
+
+inline int
+mysetjmp( JumpBuffer *j )
+{
+    return setjmp( j->buf );
+}
+#endif
+
+#endif /* __glumysetjmp_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/mystring.h b/src/glu/sgi/libnurbs/internals/mystring.h
new file mode 100644
index 00000000000..7b451c6e69e
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/mystring.h
@@ -0,0 +1,62 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * mystring.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/mystring.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glumystring_h_
+#define __glumystring_h_
+
+#ifdef STANDALONE
+typedef unsigned int size_t;
+extern "C" void *	memcpy(void *, const void *, size_t);
+extern "C" void *	memset(void *, int, size_t);
+#endif
+
+#ifdef GLBUILD
+#define memcpy(a,b,c)	bcopy(b,a,c)
+#define memset(a,b,c)	bzero(a,c)
+extern "C" void		bcopy(const void *, void *, int);
+extern "C" void		bzero(void *, int);
+#endif
+
+#ifdef LIBRARYBUILD
+#include <string.h>
+#endif
+
+#endif /* __glumystring_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/nurbsconsts.h b/src/glu/sgi/libnurbs/internals/nurbsconsts.h
new file mode 100644
index 00000000000..35d3d99a1e8
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/nurbsconsts.h
@@ -0,0 +1,126 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * nurbsconsts.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/nurbsconsts.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glunurbsconsts_h_
+#define __glunurbsconsts_h_
+
+/* NURBS Properties - one set per map, 
+   each takes a single INREAL arg */
+#define N_SAMPLING_TOLERANCE  	1
+#define N_S_RATE		6
+#define N_T_RATE		7
+#define N_CLAMPFACTOR		13
+#define 	N_NOCLAMPING		0.0
+#define N_MINSAVINGS		14
+#define 	N_NOSAVINGSSUBDIVISION	0.0
+
+/* NURBS Properties - one set per map, 
+   each takes an enumerated value */
+#define N_CULLING		2
+#define 	N_NOCULLING		0.0
+#define 	N_CULLINGON		1.0
+#define N_SAMPLINGMETHOD	10
+#define 	N_NOSAMPLING		0.0
+#define 	N_FIXEDRATE		3.0
+#define 	N_DOMAINDISTANCE	2.0
+#define 	N_PARAMETRICDISTANCE	5.0
+#define 	N_PATHLENGTH		6.0
+#define 	N_SURFACEAREA		7.0
+#define         N_OBJECTSPACE_PARA           8.0
+#define         N_OBJECTSPACE_PATH           9.0
+#define N_BBOX_SUBDIVIDING	17
+#define 	N_NOBBOXSUBDIVISION	0.0
+#define 	N_BBOXTIGHT		1.0
+#define 	N_BBOXROUND		2.0
+
+/* NURBS Rendering Properties - one set per renderer
+   each takes an enumerated value */
+#define N_DISPLAY		3
+#define 	N_FILL			1.0 	
+#define 	N_OUTLINE_POLY		2.0
+#define 	N_OUTLINE_TRI		3.0
+#define 	N_OUTLINE_QUAD	 	4.0
+#define 	N_OUTLINE_PATCH		5.0
+#define 	N_OUTLINE_PARAM		6.0
+#define 	N_OUTLINE_PARAM_S	7.0
+#define 	N_OUTLINE_PARAM_ST 	8.0
+#define 	N_OUTLINE_SUBDIV 	9.0
+#define 	N_OUTLINE_SUBDIV_S 	10.0
+#define 	N_OUTLINE_SUBDIV_ST 	11.0
+#define 	N_ISOLINE_S		12.0
+#define N_ERRORCHECKING		4
+#define 	N_NOMSG			0.0
+#define 	N_MSG			1.0
+
+/* GL 4.0 propeties not defined above */
+#ifndef N_PIXEL_TOLERANCE
+#define N_PIXEL_TOLERANCE	N_SAMPLING_TOLERANCE
+#define N_ERROR_TOLERANCE	20
+#define N_SUBDIVISIONS		5
+#define N_TILES			8
+#define N_TMP1			9
+#define N_TMP2			N_SAMPLINGMETHOD
+#define N_TMP3			11
+#define N_TMP4			12
+#define N_TMP5			N_CLAMPFACTOR
+#define N_TMP6			N_MINSAVINGS
+#define N_S_STEPS		N_S_RATE
+#define N_T_STEPS		N_T_RATE
+#endif
+
+/* NURBS Rendering Properties - one set per map,
+   each takes an INREAL matrix argument */
+#define N_CULLINGMATRIX		1
+#define N_SAMPLINGMATRIX	2
+#define N_BBOXMATRIX		3
+
+
+/* NURBS Rendering Properties - one set per map,
+   each takes an INREAL vector argument */
+#define	N_BBOXSIZE		4
+
+/* type argument for trimming curves */
+#ifndef N_P2D
+#define N_P2D 	 		0x8	
+#define N_P2DR 	 		0xd
+#endif	
+
+#endif /* __glunurbsconsts_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/nurbsinterfac.cc b/src/glu/sgi/libnurbs/internals/nurbsinterfac.cc
new file mode 100644
index 00000000000..1a68ca51d91
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/nurbsinterfac.cc
@@ -0,0 +1,537 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * nurbsinterfac.c++
+ *
+ */
+
+#include "glimports.h"
+#include "mystdio.h"
+#include "nurbsconsts.h"
+#include "nurbstess.h"
+#include "bufpool.h"
+#include "quilt.h"
+#include "displaylist.h"
+#include "knotvector.h"
+#include "mapdesc.h"
+
+#define THREAD( work, arg, cleanup ) \
+	if( dl ) {\
+	    arg->save = 1;\
+	    dl->append( (PFVS)&NurbsTessellator::work, (void *) arg, (PFVS)&NurbsTessellator::cleanup );\
+ 	} else {\
+	    arg->save = 0;\
+	    work( arg );\
+	}
+
+#define THREAD2( work ) \
+	if( dl ) {\
+	    dl->append( (PFVS)&NurbsTessellator::work, 0, 0 );\
+ 	} else {\
+	    work( );\
+	}
+
+NurbsTessellator::NurbsTessellator( BasicCurveEvaluator &c, BasicSurfaceEvaluator& e) 
+	: maplist( backend ),
+	  backend( c, e ),
+          subdivider( renderhints, backend ),
+	  o_pwlcurvePool( sizeof( O_pwlcurve ), 32, "o_pwlcurvePool" ),
+	  o_nurbscurvePool( sizeof( O_nurbscurve ), 32, "o_nurbscurvePool"),
+	  o_curvePool( sizeof( O_curve ), 32,  "o_curvePool" ),
+	  o_trimPool( sizeof( O_trim ), 32,  "o_trimPool" ),
+	  o_surfacePool( sizeof( O_surface ), 1, "o_surfacePool" ),
+	  o_nurbssurfacePool( sizeof( O_nurbssurface ), 4, "o_nurbssurfacePool" ),
+	  propertyPool( sizeof( Property ), 32, "propertyPool" ),
+          quiltPool( sizeof( Quilt  ), 32, "quiltPool" )
+{
+    dl		= 0;
+    inSurface	= 0;
+    inCurve	= 0;
+    inTrim	= 0;
+    playBack	= 0;
+    jumpbuffer  = newJumpbuffer();
+    subdivider.setJumpbuffer( jumpbuffer );
+}
+
+NurbsTessellator::~NurbsTessellator( void ) 
+{
+    if( inTrim ) {
+	do_nurbserror( 12 );
+	endtrim();
+    }
+
+    if( inSurface ) {
+        *nextNurbssurface = 0;
+        do_freeall();
+    }
+
+    if (jumpbuffer) {
+        deleteJumpbuffer(jumpbuffer);
+	jumpbuffer= 0;
+    }	
+}
+
+/*-----------------------------------------------------------------------------
+ * bgnsurface - allocate and initialize an o_surface structure
+ *
+ * Client: GL user
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::bgnsurface( long nuid )
+{
+    O_surface *o_surface = new(o_surfacePool) O_surface;
+    o_surface->nuid = nuid;
+    THREAD( do_bgnsurface, o_surface, do_freebgnsurface );
+}
+
+/*-----------------------------------------------------------------------------
+ * bgncurve - allocate an initialize an o_curve structure
+ * 
+ * Client: GL user
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::bgncurve( long nuid )
+{
+    O_curve *o_curve = new(o_curvePool) O_curve;
+    o_curve->nuid = nuid;
+    THREAD( do_bgncurve, o_curve, do_freebgncurve );
+}
+/*-----------------------------------------------------------------------------
+ * endcurve -
+ * 
+ * Client:
+ *-----------------------------------------------------------------------------
+ */
+
+void
+NurbsTessellator::endcurve( void )
+{
+    THREAD2( do_endcurve );
+}
+
+/*-----------------------------------------------------------------------------
+ * endsurface - user level end of surface call
+ *
+ * Client: GL user
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::endsurface( void )
+{
+    THREAD2( do_endsurface );
+}
+
+
+/*-----------------------------------------------------------------------------
+ * bgntrim - allocate and initialize a new trim loop structure (o_trim )
+ *
+ * Client: GL user
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::bgntrim( void )
+{
+    O_trim *o_trim = new(o_trimPool) O_trim;
+    THREAD( do_bgntrim, o_trim, do_freebgntrim );
+}
+
+/*-----------------------------------------------------------------------------
+ * endtrim -
+ *
+ * Client: GL user
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::endtrim( void )
+{
+    THREAD2( do_endtrim );
+}
+
+
+/*-----------------------------------------------------------------------------
+ * pwlcurve -
+ *
+ *      count        - number of points on curve
+ *      array        - array of points on curve
+ *      byte_stride  - distance between points in bytes
+ *      type         - valid data flag
+ *
+ * Client: Gl user
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::pwlcurve( long count, INREAL array[], long byte_stride, long type )
+{
+    Mapdesc *mapdesc = maplist.locate( type );
+
+    if( mapdesc == 0 ) {
+	do_nurbserror( 35 );
+	isDataValid = 0;
+	return;
+    }
+
+    if ( (type != N_P2D) && (type != N_P2DR) ) {
+	do_nurbserror( 22 );
+	isDataValid = 0;
+	return;
+    }
+    if( count < 0 ) {
+	do_nurbserror( 33 );
+	isDataValid = 0;
+	return;
+    }
+    if( byte_stride < 0 ) {
+	do_nurbserror( 34 );
+	isDataValid = 0;
+	return;
+    }
+
+#ifdef NOTDEF
+    if( mapdesc->isRational() ) {
+	INREAL *p = array;
+	INREAL x = p[0]; INREAL y = p[1]; INREAL w = p[2];
+	p = (INREAL *) (((char *) p) + byte_stride);
+	for( long i = 1; i != count; i++ ) {
+	    if( p[0] == x && p[1] == y && p[2] == w ) break;
+	    x = p[0]; y = p[1]; w = p[2];
+	    p = (INREAL *) (((char *) p) + byte_stride);
+	}
+	if( i != count ) {
+	    do_nurbserror( 37 );
+	    dprintf( "point %d (%f,%f)\n", i, x, y );
+	    isDataValid = 0;
+	    return;
+	}
+    } else {
+	INREAL *p = array;
+	INREAL x = p[0]; INREAL y = p[1];
+	p = (INREAL *) (((char *) p) + byte_stride);
+	for( long i = 1; i != count; i++ ) {
+	    if( p[0] == x && p[1] == y ) break;
+	    x = p[0]; y = p[1];
+	    p = (INREAL *) (((char *) p) + byte_stride);
+	}
+	if( i != count ) {
+	    do_nurbserror( 37 );
+	    dprintf( "point %d (%f,%f)\n", i, x, y );
+	    isDataValid = 0;
+	    return;
+	}
+    }
+#endif
+
+    O_pwlcurve	*o_pwlcurve = new(o_pwlcurvePool) O_pwlcurve( type, count, array, byte_stride, extTrimVertexPool.get((int)count) );
+    THREAD( do_pwlcurve, o_pwlcurve, do_freepwlcurve );
+}
+
+
+/*-----------------------------------------------------------------------------
+ * nurbscurve -
+ *
+ * Client: GL user
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::nurbscurve(
+    long nknots, 		/* number of p knots */
+    INREAL knot[], 		/* nondecreasing knot values in p */
+    long byte_stride,		/* distance in bytes between control points */
+    INREAL ctlarray[], 		/* pointer to first control point */
+    long order,			/* order of spline */
+    long type )			/* description of range space */
+{
+
+    Mapdesc *mapdesc = maplist.locate( type );
+
+    if( mapdesc == 0 ) {
+	do_nurbserror( 35 );
+	isDataValid = 0;
+	return;
+    }
+
+    if( ctlarray == 0 ) {
+	do_nurbserror( 36 );
+	isDataValid = 0;
+	return;
+    }
+
+    if( byte_stride < 0 ) {
+	do_nurbserror( 34 );
+	isDataValid = 0;
+	return;
+    }
+
+    Knotvector knots;
+
+    knots.init( nknots, byte_stride, order, knot );
+    if( do_check_knots( &knots, "curve" ) ) return;
+    
+    O_nurbscurve *o_nurbscurve = new(o_nurbscurvePool) O_nurbscurve(type);
+    o_nurbscurve->bezier_curves = new(quiltPool) Quilt(mapdesc);
+    o_nurbscurve->bezier_curves->toBezier( knots,ctlarray, mapdesc->getNcoords() );
+ 
+    THREAD( do_nurbscurve, o_nurbscurve, do_freenurbscurve );
+}
+
+
+/*-----------------------------------------------------------------------------
+ * nurbssurface -
+ *
+ * Client: User routine
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::nurbssurface(
+    long sknot_count,		/* number of s knots */
+    INREAL sknot[],		/* nondecreasing knot values in s */
+    long tknot_count, 		/* number of t knots */
+    INREAL tknot[],		/* nondecreasing knot values in t */
+    long s_byte_stride,		/* s step size in memory bytes */
+    long t_byte_stride,		/* t step size in memory bytes */
+    INREAL ctlarray[],		/* pointer to first control point */
+    long sorder,		/* order of the spline in s parameter */
+    long torder,		/* order of the spline in t parameter */
+    long type)			/* description of range space */
+{ 
+    Mapdesc *mapdesc = maplist.locate( type );
+
+    if( mapdesc == 0 ) {
+	do_nurbserror( 35 );
+	isDataValid = 0;
+	return;
+    }
+
+    if( s_byte_stride < 0 ) {
+	do_nurbserror( 34 );
+	isDataValid = 0;
+	return;
+    }
+
+    if( t_byte_stride < 0 ) {
+	do_nurbserror( 34 );
+	isDataValid = 0;
+	return;
+    }
+
+    Knotvector sknotvector, tknotvector;
+
+    sknotvector.init( sknot_count, s_byte_stride, sorder, sknot );
+    if( do_check_knots( &sknotvector, "surface" ) ) return;
+
+    tknotvector.init( tknot_count, t_byte_stride, torder, tknot );
+    if( do_check_knots( &tknotvector, "surface" ) ) return;
+
+    O_nurbssurface *o_nurbssurface = new(o_nurbssurfacePool) O_nurbssurface(type);
+    o_nurbssurface->bezier_patches = new(quiltPool) Quilt(mapdesc);
+
+    o_nurbssurface->bezier_patches->toBezier( sknotvector, tknotvector,
+	ctlarray, mapdesc->getNcoords() ); 
+    THREAD( do_nurbssurface, o_nurbssurface, do_freenurbssurface );
+}
+
+
+/*-----------------------------------------------------------------------------
+ * setnurbsproperty -
+ * 
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::setnurbsproperty( long tag, INREAL value )
+{
+    if( ! renderhints.isProperty( tag ) ) {
+	do_nurbserror( 26 );
+    } else {
+	Property *prop = new(propertyPool) Property( tag, value );
+	THREAD( do_setnurbsproperty, prop, do_freenurbsproperty );
+    }
+}
+
+/*-----------------------------------------------------------------------------
+ * setnurbsproperty -
+ * 
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::setnurbsproperty( long type, long tag, INREAL value )
+{
+    Mapdesc *mapdesc = maplist.locate( type );
+
+    if( mapdesc == 0 ) {
+	do_nurbserror( 35 );
+	return;
+    }
+
+    if( ! mapdesc->isProperty( tag ) ) {
+	do_nurbserror( 26 );
+	return;
+    }
+
+    Property *prop = new(propertyPool) Property( type, tag, value );
+    THREAD( do_setnurbsproperty2, prop, do_freenurbsproperty );
+}
+
+
+/*-----------------------------------------------------------------------------
+ * getnurbsproperty - 
+ * 
+ *-----------------------------------------------------------------------------
+ */
+
+void
+NurbsTessellator::getnurbsproperty( long tag, INREAL *value )
+{
+    if( renderhints.isProperty( tag ) ) {
+	*value = renderhints.getProperty( tag );
+    } else {
+	do_nurbserror( 26 );
+    }
+}
+
+/*-----------------------------------------------------------------------------
+ * getnurbsproperty - 
+ * 
+ *-----------------------------------------------------------------------------
+ */
+
+void
+NurbsTessellator::getnurbsproperty( long type, long tag, INREAL *value )
+{
+    Mapdesc *mapdesc = maplist.locate( type );
+
+    if( mapdesc == 0 ) 
+	do_nurbserror( 35 );
+
+    if( mapdesc->isProperty( tag  ) ) {
+	*value = mapdesc->getProperty( tag );
+    } else {
+	do_nurbserror( 26 );
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * setnurbsproperty - accept a user supplied matrix as culling or sampling mat
+ *--------------------------------------------------------------------------
+ */
+
+void 
+NurbsTessellator::setnurbsproperty( long type, long purpose, INREAL *mat )
+{
+    // XXX - cannot be put in display list
+    Mapdesc *mapdesc = maplist.locate( type );
+
+    if( mapdesc == 0 ) {
+	do_nurbserror( 35 );
+	isDataValid = 0;
+    } else if( purpose == N_BBOXSIZE ) {
+	mapdesc->setBboxsize( mat );
+    } else {
+#ifndef NDEBUG
+        dprintf( "ERRORRORRORR!!!\n");
+#endif
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * setnurbsproperty - accept a user supplied matrix as culling or sampling mat
+ *--------------------------------------------------------------------------
+ */
+
+void 
+NurbsTessellator::setnurbsproperty( long type, long purpose, INREAL *mat, 
+    long rstride, long cstride )
+{
+    // XXX - cannot be put in display list
+    Mapdesc *mapdesc = maplist.locate( type );
+
+    if( mapdesc == 0 ) {
+	do_nurbserror( 35 );
+	isDataValid = 0;
+    } else if( purpose == N_CULLINGMATRIX ) {
+	mapdesc->setCmat( mat, rstride, cstride );
+    } else if( purpose == N_SAMPLINGMATRIX ) {
+	mapdesc->setSmat( mat, rstride, cstride );
+    } else if( purpose == N_BBOXMATRIX ) {
+	mapdesc->setBmat( mat, rstride, cstride );
+    } else {
+#ifndef NDEBUG
+        dprintf( "ERRORRORRORR!!!\n");
+#endif
+    }
+}
+
+void	
+NurbsTessellator::redefineMaps( void )
+{
+    maplist.initialize();
+}
+
+void 	
+NurbsTessellator::defineMap( long type, long rational, long ncoords )
+{
+    maplist.define( type, (int) rational, (int) ncoords );
+}
+
+void 
+NurbsTessellator::discardRecording( void *_dl )
+{
+    delete (DisplayList *) _dl;
+}
+
+void * 
+NurbsTessellator::beginRecording( void )
+{
+    dl = new DisplayList( this );
+    return (void *) dl;
+}
+
+void 
+NurbsTessellator::endRecording( void )
+{
+    dl->endList();
+    dl = 0;
+}
+
+void 
+NurbsTessellator::playRecording( void *_dl )
+{
+    playBack = 1;
+    bgnrender();
+    ((DisplayList *)_dl)->play();
+    endrender();
+    playBack = 0;
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/nurbstess.cc b/src/glu/sgi/libnurbs/internals/nurbstess.cc
new file mode 100644
index 00000000000..678f067b6f3
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/nurbstess.cc
@@ -0,0 +1,693 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * nurbstess.c++
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/nurbstess.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mysetjmp.h"
+#include "mystdio.h"
+#include "nurbsconsts.h"
+#include "nurbstess.h"
+#include "bufpool.h"
+#include "quilt.h"
+#include "knotvector.h"
+#include "mapdesc.h"
+#include "maplist.h"
+
+void 
+NurbsTessellator::set_domain_distance_u_rate(REAL u_rate)
+{
+  subdivider.set_domain_distance_u_rate(u_rate);
+}
+
+void 
+NurbsTessellator::set_domain_distance_v_rate(REAL v_rate)
+{
+  subdivider.set_domain_distance_v_rate(v_rate);
+}
+
+void
+NurbsTessellator::set_is_domain_distance_sampling(int flag)
+{
+  subdivider.set_is_domain_distance_sampling(flag);
+}
+
+void
+NurbsTessellator::resetObjects( void )
+{
+    subdivider.clear();
+}
+
+void
+NurbsTessellator::makeobj( int )
+{
+#ifndef NDEBUG
+   dprintf( "makeobj\n" );
+#endif
+}
+
+void
+NurbsTessellator::closeobj( void )
+{
+#ifndef NDEBUG
+   dprintf( "closeobj\n" );
+#endif
+}
+
+void
+NurbsTessellator::bgnrender( void )
+{
+#ifndef NDEBUG
+   dprintf( "bgnrender\n" );
+#endif
+}
+
+void
+NurbsTessellator::endrender( void )
+{
+#ifndef NDEBUG
+    dprintf( "endrender\n" );
+#endif
+}
+
+/*-----------------------------------------------------------------------------
+ * do_freebgnsurface - free o_surface structure 
+ *
+ * Client: do_freeall(), bgnsurface()
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_freebgnsurface( O_surface *o_surface )
+{
+    o_surface->deleteMe( o_surfacePool );
+}
+
+
+/*-----------------------------------------------------------------------------
+ * do_bgnsurface - begin the display of a surface
+ *
+ * Client: bgnsurface()
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_bgnsurface( O_surface *o_surface )
+{
+    if( inSurface ) {
+	do_nurbserror( 27 );
+	endsurface();
+    }
+    inSurface = 1;
+
+    if( ! playBack ) bgnrender();
+
+    isTrimModified = 0;
+    isSurfaceModified = 0;
+    isDataValid = 1;
+    numTrims = 0;
+    currentSurface = o_surface;
+    nextTrim = &( currentSurface->o_trim );
+    nextNurbssurface = &( currentSurface->o_nurbssurface );
+}
+
+/*-----------------------------------------------------------------------------
+ * do_bgncurve - begin the display of a curve 
+ * 
+ * Client: bgncurve()
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_bgncurve( O_curve *o_curve )
+{
+    if ( inCurve ) {
+	do_nurbserror( 6 );
+	endcurve();
+    }
+
+    inCurve = 1;
+    currentCurve = o_curve;
+    currentCurve->curvetype = ct_none;
+
+    if( inTrim ) {
+        if( *nextCurve != o_curve ) {
+	    isCurveModified = 1;
+	    *nextCurve = o_curve;
+	}
+    } else {
+        if( ! playBack ) bgnrender();
+        isDataValid = 1;
+    }
+    nextCurve = &(o_curve->next);
+    nextPwlcurve = &(o_curve->curve.o_pwlcurve);
+    nextNurbscurve = &(o_curve->curve.o_nurbscurve);
+}
+
+/*-----------------------------------------------------------------------------
+ * do_endcurve -
+ * 
+ * Client: endcurve()
+ *-----------------------------------------------------------------------------
+ */
+    
+void
+NurbsTessellator::do_endcurve( void )
+{
+    if( ! inCurve ) {
+	do_nurbserror( 7 );
+	return;
+    }
+    inCurve = 0;
+
+    *nextCurve = 0;
+    if (currentCurve->curvetype == ct_nurbscurve)
+	*nextNurbscurve = 0;
+    else
+	*nextPwlcurve = 0;
+
+    if ( ! inTrim ) {
+        if( ! isDataValid ) {
+            do_freecurveall( currentCurve ); 
+	    return;
+        }
+
+	int errval;
+	errval = ::mysetjmp( jumpbuffer );
+	if( errval == 0 ) {
+	    if( currentCurve->curvetype == ct_nurbscurve ) {
+		subdivider.beginQuilts();
+		for( O_nurbscurve *n = currentCurve->curve.o_nurbscurve; n != 0; n = n->next ) 
+		    subdivider.addQuilt( n->bezier_curves );
+		subdivider.endQuilts();
+		subdivider.drawCurves(); 
+		if( ! playBack ) endrender();
+	    } else {
+		/* XXX */
+	        if( ! playBack ) endrender();
+	        /*do_draw_pwlcurve( currentCurve->curve.o_pwlcurve ) */;
+	        do_nurbserror( 9 );
+	    }
+	} else {
+	    if( ! playBack ) endrender();
+	    do_nurbserror( errval );
+	}
+	do_freecurveall( currentCurve );
+	resetObjects();
+    }
+}
+
+/*-----------------------------------------------------------------------------
+ * do_endsurface - mark end of surface, display surface, free immediate data 
+ *
+ * Client:
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_endsurface( void )
+{
+    if( inTrim ) {
+	do_nurbserror( 12 );
+	endtrim();
+    }
+
+    if( ! inSurface ) {
+	do_nurbserror( 13 );
+	return;
+    }
+    inSurface = 0;
+
+    *nextNurbssurface = 0;
+
+    if( ! isDataValid ) {
+        do_freeall( ); 
+	return;
+    }
+
+    if( *nextTrim != 0 ) {
+	isTrimModified = 1;
+        *nextTrim = 0;
+    }
+
+    int errval;
+
+    errval = ::mysetjmp( jumpbuffer );
+    if( errval == 0 ) {
+        if( numTrims > 0 ) {
+
+	    subdivider.beginTrims();
+	    for( O_trim	*trim = currentSurface->o_trim; trim; trim = trim->next ) {
+		subdivider.beginLoop();
+		for( O_curve *curve = trim->o_curve; curve; curve = curve->next ) {  
+		    curve->used = 0;
+		    assert( curve->curvetype != ct_none );
+		    if (curve->curvetype == ct_pwlcurve) {
+			O_pwlcurve *c = curve->curve.o_pwlcurve; 
+			subdivider.addArc( c->npts, c->pts, curve->nuid );
+		    } else {
+			Quilt	   *quilt = curve->curve.o_nurbscurve->bezier_curves;
+			Quiltspec  *qspec = quilt->qspec;
+			REAL       *cpts  = quilt->cpts + qspec->offset;
+			REAL       *cptsend = cpts + (qspec->width * qspec->order * qspec->stride);
+			for( ; cpts != cptsend; cpts += qspec->order*qspec->stride ) 
+			     subdivider.addArc( cpts, quilt, curve->nuid );
+		    }
+		}
+		subdivider.endLoop();
+	    }
+	    subdivider.endTrims();
+	}
+
+	subdivider.beginQuilts();
+	for( O_nurbssurface *n = currentSurface->o_nurbssurface; n; n = n->next ) 
+	    subdivider.addQuilt( n->bezier_patches );
+	subdivider.endQuilts();
+        subdivider.drawSurfaces( currentSurface->nuid ); 
+	if( ! playBack ) endrender();
+    } else {
+	if( ! playBack ) endrender();
+	do_nurbserror( errval );
+    }
+
+    do_freeall( );
+    resetObjects();
+}
+
+/*-----------------------------------------------------------------------------
+ * do_freeall - free all data allocated in immediate mode
+ *
+ * Client:
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_freeall( void )
+{
+    for( O_trim *o_trim = currentSurface->o_trim; o_trim; ) {
+	O_trim *next_o_trim = o_trim->next;
+        for( O_curve *curve = o_trim->o_curve; curve; ) {
+	    O_curve *next_o_curve = curve->next;
+	    do_freecurveall( curve );
+	    curve = next_o_curve;
+	}
+	if( o_trim->save == 0 ) do_freebgntrim( o_trim );
+	o_trim = next_o_trim;
+    }
+
+    O_nurbssurface *nurbss, *next_nurbss;
+    for( nurbss= currentSurface->o_nurbssurface; nurbss; nurbss = next_nurbss) {
+	next_nurbss = nurbss->next;
+	if( nurbss->save == 0 )
+	    do_freenurbssurface( nurbss );
+	else
+	    nurbss->used = 0;
+    }
+
+    if( currentSurface->save == 0 ) do_freebgnsurface( currentSurface );
+}
+
+void
+NurbsTessellator::do_freecurveall( O_curve *curve )
+{
+    assert( curve->curvetype != ct_none );
+
+    if( curve->curvetype == ct_nurbscurve ) {
+	O_nurbscurve *ncurve, *next_ncurve;
+	for( ncurve=curve->curve.o_nurbscurve; ncurve; ncurve=next_ncurve ) {
+	    next_ncurve = ncurve->next;
+	    if( ncurve->save == 0 )
+		do_freenurbscurve( ncurve );
+	    else
+		ncurve->used = 0;
+	}
+    } else {
+	O_pwlcurve *pcurve, *next_pcurve;
+	for( pcurve=curve->curve.o_pwlcurve; pcurve; pcurve=next_pcurve ) {
+	    next_pcurve = pcurve->next;
+	    if( pcurve->save == 0 )
+		do_freepwlcurve( pcurve );
+	    else
+		pcurve->used = 0;
+	}
+    }
+    if( curve->save == 0 )
+        do_freebgncurve( curve );
+}
+
+
+/*-----------------------------------------------------------------------------
+ * do_freebgntrim - free the space allocated for a trim loop
+ *
+ * Client:
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_freebgntrim( O_trim *o_trim )
+{ 
+    o_trim->deleteMe( o_trimPool );
+}
+
+
+/*-----------------------------------------------------------------------------
+ * do_bgntrim - link in a trim loop to the current trimmed surface description
+ *
+ * Client: bgntrim()
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_bgntrim( O_trim *o_trim )
+{
+
+    if( ! inSurface ) {
+	do_nurbserror( 15 );
+	bgnsurface( 0 );
+	inSurface = 2;
+    }
+
+    if( inTrim ) {
+	do_nurbserror( 16 );
+	endtrim();
+    }
+    inTrim = 1;
+
+    if( *nextTrim != o_trim ) {
+	isTrimModified = 1;	
+        *nextTrim = o_trim;
+    }
+
+    currentTrim = o_trim;
+    nextTrim = &(o_trim->next);
+    nextCurve = &(o_trim->o_curve);
+}
+
+
+/*-----------------------------------------------------------------------------
+ * do_endtrim - mark the end of the current trim loop 
+ *
+ * Client: endtrim()
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_endtrim( void )
+{
+    if( ! inTrim ) {
+	do_nurbserror( 17 );
+	return;
+    }
+    inTrim = 0;
+
+    if( currentTrim->o_curve == 0 ) {
+	do_nurbserror( 18 );
+	isDataValid = 0;
+    }
+
+    numTrims++;
+   
+    if( *nextCurve != 0 ) {
+	isTrimModified = 1;
+        *nextCurve = 0;	
+    }
+}
+
+/*-----------------------------------------------------------------------------
+ * do_freepwlcurve -
+ * 
+ * Client:
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_freepwlcurve( O_pwlcurve *o_pwlcurve )
+{
+    o_pwlcurve->deleteMe( o_pwlcurvePool );
+}
+
+void
+NurbsTessellator::do_freebgncurve( O_curve *o_curve )
+{
+    o_curve->deleteMe( o_curvePool );
+}
+
+/*-----------------------------------------------------------------------------
+ * do_pwlcurve - link in pwl trim loop to the current surface description
+ * 
+ * Client: pwlcurve()
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_pwlcurve( O_pwlcurve *o_pwlcurve )
+{
+    if( ! inTrim ) {
+	do_nurbserror( 19 );
+	if( o_pwlcurve->save == 0 )
+	    do_freepwlcurve(o_pwlcurve );
+	return;
+    }
+
+    if( ! inCurve ) {
+	bgncurve( 0 );
+	inCurve = 2;
+    }
+
+    if( o_pwlcurve->used ) {
+	do_nurbserror( 20 );
+	isDataValid = 0;
+	return;
+    } else
+        o_pwlcurve->used = 1;
+
+    if( currentCurve->curvetype == ct_none ) {
+        currentCurve->curvetype = ct_pwlcurve;
+    } else if( currentCurve->curvetype != ct_pwlcurve ) {
+	do_nurbserror( 21 );
+	isDataValid = 0;
+	return;
+    }
+	
+    if( *nextPwlcurve != o_pwlcurve ) {
+	isCurveModified = 1;
+        *nextPwlcurve = o_pwlcurve;
+    }
+    nextPwlcurve = &(o_pwlcurve->next);
+
+    if( o_pwlcurve->owner != currentCurve ) {
+	isCurveModified = 1;
+	o_pwlcurve->owner = currentCurve;
+    }
+
+    if( (inCurve == 2) ) 
+	endcurve();
+}
+
+
+/*-----------------------------------------------------------------------------
+ * do_freenurbscurve -
+ * 
+ * Client:
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_freenurbscurve( O_nurbscurve *o_nurbscurve )
+{
+    o_nurbscurve->bezier_curves->deleteMe( quiltPool );
+    o_nurbscurve->deleteMe( o_nurbscurvePool );
+}
+
+
+/*-----------------------------------------------------------------------------
+ * do_nurbscurve -
+ * 
+ * Client: nurbscurve() 
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_nurbscurve( O_nurbscurve *o_nurbscurve )
+{
+    if ( ! inCurve ) {
+	bgncurve( 0 );
+	inCurve = 2;
+    }
+
+    if( o_nurbscurve->used ) {
+	/* error - curve was already called in current surface */
+	do_nurbserror( 23 );
+	isDataValid = 0;
+	return;
+    } else
+        o_nurbscurve->used = 1;
+
+    if( currentCurve->curvetype == ct_none ) {
+        currentCurve->curvetype = ct_nurbscurve;
+    } else if( currentCurve->curvetype != ct_nurbscurve ) {
+	do_nurbserror( 24 );
+	isDataValid = 0;
+	return;
+    }
+	
+    if( *nextNurbscurve != o_nurbscurve ) {
+	isCurveModified = 1;
+	*nextNurbscurve = o_nurbscurve;
+    }
+
+    nextNurbscurve = &(o_nurbscurve->next);
+
+    if( o_nurbscurve->owner != currentCurve ) {
+	isCurveModified = 1;
+	o_nurbscurve->owner = currentCurve;
+    }
+
+    if( o_nurbscurve->owner == 0 )
+	isCurveModified = 1;
+    
+    if( inCurve == 2 )
+        endcurve();
+}
+
+
+/*-----------------------------------------------------------------------------
+ * do_freenurbssurface -
+ *
+ * Client:
+ *-----------------------------------------------------------------------------
+ */
+
+void
+NurbsTessellator::do_freenurbssurface( O_nurbssurface *o_nurbssurface )
+{
+    o_nurbssurface->bezier_patches->deleteMe( quiltPool );
+    o_nurbssurface->deleteMe( o_nurbssurfacePool );
+}
+
+/*-----------------------------------------------------------------------------
+ * do_nurbssurface -
+ * 
+ * Client: nurbssurface()
+ *-----------------------------------------------------------------------------
+ */
+void
+NurbsTessellator::do_nurbssurface( O_nurbssurface *o_nurbssurface )
+{
+    if( ! inSurface ) {
+	bgnsurface( 0 );
+	inSurface = 2;
+    }
+
+    if( o_nurbssurface->used ) {
+	/* error - surface was already called in current block */
+	do_nurbserror( 25 );
+	isDataValid = 0;
+	return;
+    } else
+        o_nurbssurface->used = 1;
+
+    if( *nextNurbssurface != o_nurbssurface ) {
+	isSurfaceModified = 1;
+        *nextNurbssurface  = o_nurbssurface;
+    }
+
+    if( o_nurbssurface->owner != currentSurface ) {
+	isSurfaceModified = 1;
+	o_nurbssurface->owner = currentSurface;
+    }
+    nextNurbssurface = &(o_nurbssurface->next);
+
+    if( inSurface == 2  )
+	endsurface();
+}
+
+
+/*-----------------------------------------------------------------------------
+ * do_freenurbsproperty
+ * 
+ *-----------------------------------------------------------------------------
+ */
+
+void
+NurbsTessellator::do_freenurbsproperty( Property *prop )
+{
+    prop->deleteMe( propertyPool );
+}
+
+    
+/*-----------------------------------------------------------------------------
+ * do_setnurbsproperty -
+ * 
+ *-----------------------------------------------------------------------------
+ */
+
+void
+NurbsTessellator::do_setnurbsproperty( Property *prop )
+{
+    renderhints.setProperty( prop->tag, prop->value );
+    if( prop->save == 0 )
+	do_freenurbsproperty( prop );
+}
+
+void
+NurbsTessellator::do_setnurbsproperty2( Property *prop )
+{
+    Mapdesc *mapdesc = maplist.find( prop->type );
+
+    mapdesc->setProperty( prop->tag, prop->value );
+    if( prop->save == 0 )
+	do_freenurbsproperty( prop );
+}
+
+void
+NurbsTessellator::errorHandler( int )
+{
+}
+
+void
+NurbsTessellator::do_nurbserror( int msg )
+{
+    errorHandler( msg );
+}
+
+int 
+NurbsTessellator::do_check_knots( Knotvector *knots, char *msg )
+{
+    int status = knots->validate();
+    if( status ) {
+	do_nurbserror( status );
+        if( renderhints.errorchecking != N_NOMSG ) knots->show( msg );
+    }
+    return status;
+}
+
+
+
+
+
diff --git a/src/glu/sgi/libnurbs/internals/nurbstess.h b/src/glu/sgi/libnurbs/internals/nurbstess.h
new file mode 100644
index 00000000000..3577088a9c2
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/nurbstess.h
@@ -0,0 +1,176 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * nurbstess.h
+ *
+ */
+
+#ifndef __glunurbstess_h_
+#define __glunurbstess_h_
+
+#include "mysetjmp.h"
+#include "subdivider.h"
+#include "renderhints.h"
+#include "backend.h"
+#include "maplist.h"
+#include "reader.h"
+#include "nurbsconsts.h"
+
+struct Knotvector;
+class Quilt;
+class DisplayList;
+class BasicCurveEvaluator;
+class BasicSurfaceEvaluator;
+
+class NurbsTessellator {
+public:
+    			NurbsTessellator( BasicCurveEvaluator &c,
+                                          BasicSurfaceEvaluator &e );
+    			virtual ~NurbsTessellator( void );
+
+    void     		getnurbsproperty( long, INREAL * );
+    void     		getnurbsproperty( long, long, INREAL * );
+    void     		setnurbsproperty( long, INREAL );
+    void     		setnurbsproperty( long, long, INREAL );
+    void		setnurbsproperty( long, long, INREAL * );
+    void		setnurbsproperty( long, long, INREAL *, long, long );
+
+    // called before a tessellation begins/ends
+    virtual void	bgnrender( void );
+    virtual void	endrender( void );
+
+    // called to make a display list of the output vertices
+    virtual void	makeobj( int n );
+    virtual void	closeobj( void );
+
+    // called when a error occurs
+    virtual void	errorHandler( int );
+
+    void     		bgnsurface( long );
+    void     		endsurface( void );
+    void     		bgntrim( void );
+    void     		endtrim( void );
+    void     		bgncurve( long );
+    void     		endcurve( void );
+    void     		pwlcurve( long, INREAL[], long, long );
+    void     		nurbscurve( long, INREAL[], long, INREAL[], long, long );
+    void     		nurbssurface( long, INREAL[], long, INREAL[], long, long,
+			    INREAL[], long, long, long );
+
+    void 		defineMap( long, long, long );
+    void		redefineMaps( void );
+
+    // recording of input description
+    void 		discardRecording( void * );
+    void * 		beginRecording( void );
+    void 		endRecording( void );
+    void 		playRecording( void * );
+
+    //for optimizing untrimmed nurbs in the case of domain distance sampling
+    void set_domain_distance_u_rate(REAL u_rate);
+    void set_domain_distance_v_rate(REAL v_rate);
+    void set_is_domain_distance_sampling(int flag);
+    
+
+protected:
+    Renderhints		renderhints;
+    Maplist		maplist;
+    Backend		backend;
+
+private:
+
+    void		resetObjects( void );
+    int			do_check_knots( Knotvector *, char * );
+    void		do_nurbserror( int );
+    void		do_bgncurve( O_curve * );
+    void		do_endcurve( void );
+    void		do_freeall( void );
+    void		do_freecurveall( O_curve * );
+    void		do_freebgntrim( O_trim * );
+    void		do_freebgncurve( O_curve * );
+    void		do_freepwlcurve( O_pwlcurve * );
+    void		do_freenurbscurve( O_nurbscurve * );
+    void		do_freenurbssurface( O_nurbssurface * );
+    void 		do_freebgnsurface( O_surface * );
+    void		do_bgnsurface( O_surface * );
+    void		do_endsurface( void );
+    void		do_bgntrim( O_trim * );
+    void		do_endtrim( void );
+    void		do_pwlcurve( O_pwlcurve * );
+    void		do_nurbscurve( O_nurbscurve * );
+    void		do_nurbssurface( O_nurbssurface * );
+    void		do_freenurbsproperty( Property * );
+    void		do_setnurbsproperty( Property * );
+    void		do_setnurbsproperty2( Property * );
+
+    Subdivider		subdivider;
+    JumpBuffer* 	jumpbuffer;
+    Pool		o_pwlcurvePool;
+    Pool		o_nurbscurvePool;
+    Pool		o_curvePool;
+    Pool		o_trimPool;
+    Pool		o_surfacePool;
+    Pool		o_nurbssurfacePool;
+    Pool		propertyPool;
+public:
+    Pool		quiltPool;
+private:
+    TrimVertexPool	extTrimVertexPool;
+
+    int			inSurface;		/* bgnsurface seen */
+    int			inCurve;		/* bgncurve seen */
+    int			inTrim;			/* bgntrim seen */
+    int			isCurveModified;	/* curve changed */
+    int			isTrimModified;		/* trim curves changed */
+    int			isSurfaceModified;	/* surface changed */
+    int			isDataValid;		/* all data is good */
+    int			numTrims;		/* valid trim regions */
+    int			playBack;
+
+    O_trim**		nextTrim;		/* place to link o_trim */
+    O_curve**		nextCurve;		/* place to link o_curve */
+    O_nurbscurve**	nextNurbscurve;		/* place to link o_nurbscurve */
+    O_pwlcurve**	nextPwlcurve;		/* place to link o_pwlcurve */
+    O_nurbssurface**	nextNurbssurface;	/* place to link o_nurbssurface */
+
+    O_surface*		currentSurface;
+    O_trim*		currentTrim;
+    O_curve*		currentCurve;
+
+    DisplayList		*dl;
+
+};
+
+#endif /* __glunurbstess_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/patch.cc b/src/glu/sgi/libnurbs/internals/patch.cc
new file mode 100644
index 00000000000..664819cae77
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/patch.cc
@@ -0,0 +1,506 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * patch.c++
+ *
+ * $Date: 2002/11/01 23:35:07 $ $Revision: 1.3 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/patch.cc,v 1.3 2002/11/01 23:35:07 brianp Exp $
+ */
+
+#include <stdio.h>
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "mymath.h"
+#include "mystring.h"
+#include "patch.h"
+#include "mapdesc.h"
+#include "quilt.h"
+#include "nurbsconsts.h"
+#include "simplemath.h" //for glu_abs function in ::singleStep();
+
+
+/*--------------------------------------------------------------------------
+ * Patch - copy patch from quilt and transform control points
+ *--------------------------------------------------------------------------
+ */
+
+Patch::Patch( Quilt_ptr geo, REAL *pta, REAL *ptb, Patch *n )
+{
+/* pspec[i].range is uninit here */
+    mapdesc = geo->mapdesc;
+    cullval = mapdesc->isCulling() ? CULL_ACCEPT : CULL_TRIVIAL_ACCEPT;
+    notInBbox = mapdesc->isBboxSubdividing() ? 1 : 0;
+    needsSampling = mapdesc->isRangeSampling() ? 1 : 0;
+    pspec[0].order = geo->qspec[0].order;
+    pspec[1].order = geo->qspec[1].order;
+    pspec[0].stride = pspec[1].order * MAXCOORDS;
+    pspec[1].stride = MAXCOORDS;
+
+    /* transform control points to sampling and culling spaces */
+    REAL *ps  = geo->cpts;
+    geo->select( pta, ptb );
+    ps += geo->qspec[0].offset;
+    ps += geo->qspec[1].offset;
+    ps += geo->qspec[0].index * geo->qspec[0].order * geo->qspec[0].stride;
+    ps += geo->qspec[1].index * geo->qspec[1].order * geo->qspec[1].stride;
+
+    if( needsSampling ) {
+	mapdesc->xformSampling( ps, geo->qspec[0].order, geo->qspec[0].stride, 
+				geo->qspec[1].order, geo->qspec[1].stride,
+			        spts, pspec[0].stride, pspec[1].stride );
+    }
+
+    if( cullval == CULL_ACCEPT  ) {
+	mapdesc->xformCulling( ps, geo->qspec[0].order, geo->qspec[0].stride, 
+			       geo->qspec[1].order, geo->qspec[1].stride,
+			       cpts, pspec[0].stride, pspec[1].stride ); 
+    }
+    
+    if( notInBbox ) {
+	mapdesc->xformBounding( ps, geo->qspec[0].order, geo->qspec[0].stride, 
+			       geo->qspec[1].order, geo->qspec[1].stride,
+			       bpts, pspec[0].stride, pspec[1].stride ); 
+    }
+    
+    /* set scale range */
+    pspec[0].range[0] = geo->qspec[0].breakpoints[geo->qspec[0].index];
+    pspec[0].range[1] = geo->qspec[0].breakpoints[geo->qspec[0].index+1];
+    pspec[0].range[2] = pspec[0].range[1] - pspec[0].range[0];
+
+    pspec[1].range[0] = geo->qspec[1].breakpoints[geo->qspec[1].index];
+    pspec[1].range[1] = geo->qspec[1].breakpoints[geo->qspec[1].index+1];
+    pspec[1].range[2] = pspec[1].range[1] - pspec[1].range[0];
+
+    // may need to subdivide to match range of sub-patch
+    if( pspec[0].range[0] != pta[0] ) {
+	assert( pspec[0].range[0] < pta[0] );
+	Patch lower( *this, 0, pta[0], 0 );
+	*this = lower;
+    }
+
+    if( pspec[0].range[1] != ptb[0] ) {
+	assert( pspec[0].range[1] > ptb[0] );
+	Patch upper( *this, 0, ptb[0], 0 );
+    }
+
+    if( pspec[1].range[0] != pta[1] ) {
+	assert( pspec[1].range[0] < pta[1] );
+	Patch lower( *this, 1, pta[1], 0 );
+	*this = lower;
+    }
+
+    if( pspec[1].range[1] != ptb[1] ) {
+	assert( pspec[1].range[1] > ptb[1] );
+	Patch upper( *this, 1, ptb[1], 0 );
+    }
+    checkBboxConstraint();
+    next = n;
+}
+
+/*--------------------------------------------------------------------------
+ * Patch - subdivide a patch along an isoparametric line
+ *--------------------------------------------------------------------------
+ */
+
+Patch::Patch( Patch& upper, int param, REAL value, Patch *n )
+{
+    Patch& lower = *this;
+
+    lower.cullval = upper.cullval;
+    lower.mapdesc = upper.mapdesc;
+    lower.notInBbox = upper.notInBbox;
+    lower.needsSampling = upper.needsSampling;
+    lower.pspec[0].order = upper.pspec[0].order;
+    lower.pspec[1].order = upper.pspec[1].order;
+    lower.pspec[0].stride = upper.pspec[0].stride;
+    lower.pspec[1].stride = upper.pspec[1].stride;
+    lower.next = n;
+
+    /* reset scale range */
+    switch( param ) {
+	case 0: {
+    	    REAL d = (value-upper.pspec[0].range[0]) / upper.pspec[0].range[2];
+	    if( needsSampling )
+                mapdesc->subdivide( upper.spts, lower.spts, d, pspec[1].order,
+                        pspec[1].stride, pspec[0].order, pspec[0].stride );
+
+    	    if( cullval == CULL_ACCEPT ) 
+	        mapdesc->subdivide( upper.cpts, lower.cpts, d, pspec[1].order,
+                        pspec[1].stride, pspec[0].order, pspec[0].stride );
+
+    	    if( notInBbox ) 
+	        mapdesc->subdivide( upper.bpts, lower.bpts, d, pspec[1].order,
+                        pspec[1].stride, pspec[0].order, pspec[0].stride );
+	    
+            lower.pspec[0].range[0] = upper.pspec[0].range[0];
+            lower.pspec[0].range[1] = value;
+    	    lower.pspec[0].range[2] = value - upper.pspec[0].range[0];
+            upper.pspec[0].range[0] = value;
+    	    upper.pspec[0].range[2] = upper.pspec[0].range[1] - value;
+
+            lower.pspec[1].range[0] = upper.pspec[1].range[0];
+            lower.pspec[1].range[1] = upper.pspec[1].range[1];
+    	    lower.pspec[1].range[2] = upper.pspec[1].range[2];
+	    break;
+	}
+	case 1: {
+    	    REAL d = (value-upper.pspec[1].range[0]) / upper.pspec[1].range[2];
+	    if( needsSampling )
+	        mapdesc->subdivide( upper.spts, lower.spts, d, pspec[0].order,
+                        pspec[0].stride, pspec[1].order, pspec[1].stride );
+    	    if( cullval == CULL_ACCEPT ) 
+	        mapdesc->subdivide( upper.cpts, lower.cpts, d, pspec[0].order,
+                        pspec[0].stride, pspec[1].order, pspec[1].stride );
+    	    if( notInBbox ) 
+	        mapdesc->subdivide( upper.bpts, lower.bpts, d, pspec[0].order,
+                        pspec[0].stride, pspec[1].order, pspec[1].stride );
+            lower.pspec[0].range[0] = upper.pspec[0].range[0];
+            lower.pspec[0].range[1] = upper.pspec[0].range[1];
+    	    lower.pspec[0].range[2] = upper.pspec[0].range[2];
+
+            lower.pspec[1].range[0] = upper.pspec[1].range[0];
+            lower.pspec[1].range[1] = value;
+    	    lower.pspec[1].range[2] = value - upper.pspec[1].range[0];
+            upper.pspec[1].range[0] = value;
+    	    upper.pspec[1].range[2] = upper.pspec[1].range[1] - value;
+	    break;
+	}
+    }
+
+    // inherit bounding box
+    if( mapdesc->isBboxSubdividing() && ! notInBbox )
+	memcpy( lower.bb, upper.bb, sizeof( bb ) );
+	    
+    lower.checkBboxConstraint();
+    upper.checkBboxConstraint();
+}
+
+/*--------------------------------------------------------------------------
+ * clamp - clamp the sampling rate to a given maximum
+ *--------------------------------------------------------------------------
+ */
+
+void
+Patch::clamp( void )
+{
+    if( mapdesc->clampfactor != N_NOCLAMPING ) {
+	pspec[0].clamp( mapdesc->clampfactor );
+	pspec[1].clamp( mapdesc->clampfactor );
+    }
+}
+
+void 
+Patchspec::clamp( REAL clampfactor )
+{
+    if( sidestep[0] < minstepsize )
+        sidestep[0] = clampfactor * minstepsize;
+    if( sidestep[1] < minstepsize )
+        sidestep[1] = clampfactor * minstepsize;
+    if( stepsize < minstepsize )
+        stepsize = clampfactor * minstepsize;
+}
+
+void 
+Patch::checkBboxConstraint( void )
+{
+    if( notInBbox && 
+	mapdesc->bboxTooBig( bpts, pspec[0].stride, pspec[1].stride,
+				   pspec[0].order, pspec[1].order, bb ) != 1 ) {
+	notInBbox = 0;
+    }
+}
+
+void
+Patch::bbox( void )
+{
+    if( mapdesc->isBboxSubdividing() )
+	mapdesc->surfbbox( bb );
+}
+
+/*--------------------------------------------------------------------------
+ * getstepsize - compute the sampling density across the patch
+ * 		and determine if patch needs to be subdivided
+ *--------------------------------------------------------------------------
+ */
+
+void
+Patch::getstepsize( void )
+{
+    pspec[0].minstepsize = pspec[1].minstepsize = 0;
+    pspec[0].needsSubdivision = pspec[1].needsSubdivision = 0;
+
+    if( mapdesc->isConstantSampling() ) {
+	// fixed number of samples per patch in each direction
+	// maxsrate is number of s samples per patch
+	// maxtrate is number of t samples per patch
+        pspec[0].getstepsize( mapdesc->maxsrate );
+        pspec[1].getstepsize( mapdesc->maxtrate );
+
+    } else if( mapdesc->isDomainSampling() ) {
+	// maxsrate is number of s samples per unit s length of domain
+	// maxtrate is number of t samples per unit t length of domain
+        pspec[0].getstepsize( mapdesc->maxsrate * pspec[0].range[2] );
+        pspec[1].getstepsize( mapdesc->maxtrate * pspec[1].range[2] );
+
+    } else if( ! needsSampling ) {
+	pspec[0].singleStep();
+	pspec[1].singleStep();
+    } else {
+	// upper bound on path length between sample points
+        REAL tmp[MAXORDER][MAXORDER][MAXCOORDS];
+	const int trstride = sizeof(tmp[0]) / sizeof(REAL);
+	const int tcstride = sizeof(tmp[0][0]) / sizeof(REAL); 
+
+	assert( pspec[0].order <= MAXORDER );
+    
+	/* points have been transformed, therefore they are homogeneous */
+
+	int val = mapdesc->project( spts, pspec[0].stride, pspec[1].stride, 
+		 &tmp[0][0][0], trstride, tcstride, 
+		 pspec[0].order, pspec[1].order ); 
+        if( val == 0 ) {
+	    // control points cross infinity, therefore partials are undefined
+            pspec[0].getstepsize( mapdesc->maxsrate );
+            pspec[1].getstepsize( mapdesc->maxtrate );
+        } else {
+            REAL t1 = mapdesc->getProperty( N_PIXEL_TOLERANCE );
+//	    REAL t2 = mapdesc->getProperty( N_ERROR_TOLERANCE );
+	    pspec[0].minstepsize = ( mapdesc->maxsrate > 0.0 ) ? 
+			(pspec[0].range[2] / mapdesc->maxsrate) : 0.0;
+	    pspec[1].minstepsize = ( mapdesc->maxtrate > 0.0 ) ? 
+			(pspec[1].range[2] / mapdesc->maxtrate) : 0.0;
+	    if( mapdesc->isParametricDistanceSampling() ||
+                mapdesc->isObjectSpaceParaSampling() ) {       
+
+                REAL t2;
+                t2 = mapdesc->getProperty( N_ERROR_TOLERANCE );
+		
+		// t2 is upper bound on the distance between surface and tessellant 
+		REAL ssv[2], ttv[2];
+		REAL ss = mapdesc->calcPartialVelocity( ssv, &tmp[0][0][0], trstride, tcstride, pspec[0].order, pspec[1].order, 2, 0, pspec[0].range[2], pspec[1].range[2], 0 );
+		REAL st = mapdesc->calcPartialVelocity(   0, &tmp[0][0][0], trstride, tcstride, pspec[0].order, pspec[1].order, 1, 1, pspec[0].range[2], pspec[1].range[2], -1 );
+		REAL tt = mapdesc->calcPartialVelocity( ttv, &tmp[0][0][0], trstride, tcstride, pspec[0].order, pspec[1].order, 0, 2, pspec[0].range[2], pspec[1].range[2], 1 );
+	        //make sure that ss st and tt are nonnegative:
+ 	        if(ss <0) ss = -ss;
+	        if(st <0) st = -st;
+                if(tt <0) tt = -tt;
+
+		if( ss != 0.0 && tt != 0.0 ) {
+		    /* printf( "ssv[0] %g ssv[1] %g ttv[0] %g ttv[1] %g\n", 
+			ssv[0], ssv[1], ttv[0], ttv[1] ); */
+		    REAL ttq = sqrtf( (float) ss );
+		    REAL ssq = sqrtf( (float) tt );
+		    REAL ds = sqrtf( 4 * t2 * ttq / ( ss * ttq + st * ssq ) );
+		    REAL dt = sqrtf( 4 * t2 * ssq / ( tt * ssq + st * ttq ) );
+		    pspec[0].stepsize = ( ds < pspec[0].range[2] ) ? ds : pspec[0].range[2];
+		    REAL scutoff = 2.0 * t2 / ( pspec[0].range[2] * pspec[0].range[2]);
+		    pspec[0].sidestep[0] = (ssv[0] > scutoff) ? sqrtf( 2.0 * t2 / ssv[0] ) : pspec[0].range[2];
+		    pspec[0].sidestep[1] = (ssv[1] > scutoff) ? sqrtf( 2.0 * t2 / ssv[1] ) : pspec[0].range[2];
+    
+		    pspec[1].stepsize = ( dt < pspec[1].range[2] ) ? dt : pspec[1].range[2];
+		    REAL tcutoff = 2.0 * t2 / ( pspec[1].range[2] * pspec[1].range[2]);
+		    pspec[1].sidestep[0] = (ttv[0] > tcutoff) ? sqrtf( 2.0 * t2 / ttv[0] ) : pspec[1].range[2];
+		    pspec[1].sidestep[1] = (ttv[1] > tcutoff) ? sqrtf( 2.0 * t2 / ttv[1] ) : pspec[1].range[2];
+		} else if( ss != 0.0 ) {
+		    REAL x = pspec[1].range[2] * st;
+		    REAL ds = ( sqrtf( x * x + 8.0 * t2 * ss ) - x ) / ss;
+		    pspec[0].stepsize = ( ds < pspec[0].range[2] ) ? ds : pspec[0].range[2];
+		    REAL scutoff = 2.0 * t2 / ( pspec[0].range[2] * pspec[0].range[2]);
+		    pspec[0].sidestep[0] = (ssv[0] > scutoff) ? sqrtf( 2.0 * t2 / ssv[0] ) : pspec[0].range[2];
+		    pspec[0].sidestep[1] = (ssv[1] > scutoff) ? sqrtf( 2.0 * t2 / ssv[1] ) : pspec[0].range[2];
+		    pspec[1].singleStep();
+		} else if( tt != 0.0 ) {
+		    REAL x = pspec[0].range[2] * st;
+		    REAL dt = ( sqrtf( x * x + 8.0 * t2 * tt ) - x )  / tt;
+		    pspec[0].singleStep();
+		    REAL tcutoff = 2.0 * t2 / ( pspec[1].range[2] * pspec[1].range[2]);
+		    pspec[1].stepsize = ( dt < pspec[1].range[2] ) ? dt : pspec[1].range[2];
+		    pspec[1].sidestep[0] = (ttv[0] > tcutoff) ? sqrtf( 2.0 * t2 / ttv[0] ) : pspec[1].range[2];
+		    pspec[1].sidestep[1] = (ttv[1] > tcutoff) ? sqrtf( 2.0 * t2 / ttv[1] ) : pspec[1].range[2];
+		} else {
+		    if( 4.0 * t2  > st * pspec[0].range[2] * pspec[1].range[2] ) {
+			pspec[0].singleStep();
+			pspec[1].singleStep();
+		    } else {
+			REAL area = 4.0 * t2 / st;
+			REAL ds = sqrtf( area * pspec[0].range[2] / pspec[1].range[2] );
+			REAL dt = sqrtf( area * pspec[1].range[2] / pspec[0].range[2] );
+			pspec[0].stepsize = ( ds < pspec[0].range[2] ) ? ds : pspec[0].range[2];
+			pspec[0].sidestep[0] = pspec[0].range[2];
+			pspec[0].sidestep[1] = pspec[0].range[2];
+	
+			pspec[1].stepsize = ( dt < pspec[1].range[2] ) ? dt : pspec[1].range[2];
+			pspec[1].sidestep[0] = pspec[1].range[2];
+			pspec[1].sidestep[1] = pspec[1].range[2];
+		    }
+		}	
+	    } else if( mapdesc->isPathLengthSampling() ||
+		      mapdesc->isObjectSpacePathSampling()) {
+		// t1 is upper bound on path length
+		REAL msv[2], mtv[2];
+		REAL ms = mapdesc->calcPartialVelocity( msv, &tmp[0][0][0], trstride, tcstride, pspec[0].order, pspec[1].order, 1, 0, pspec[0].range[2], pspec[1].range[2], 0 );
+		REAL mt = mapdesc->calcPartialVelocity( mtv, &tmp[0][0][0], trstride, tcstride, pspec[0].order, pspec[1].order, 0, 1, pspec[0].range[2], pspec[1].range[2], 1 );
+                REAL side_scale = 1.0;
+
+		if( ms != 0.0 ) {
+		    if( mt != 0.0 ) {
+/*		    REAL d = t1 / ( ms * ms + mt * mt );*/
+/*		    REAL ds = mt * d;*/
+		    REAL ds = t1 / (2.0*ms);
+/*		    REAL dt = ms * d;*/
+		    REAL dt = t1 / (2.0*mt); 
+			pspec[0].stepsize = ( ds < pspec[0].range[2] ) ? ds : pspec[0].range[2];
+			pspec[0].sidestep[0] = ( msv[0] * pspec[0].range[2] > t1 ) ? (side_scale* t1 / msv[0]) : pspec[0].range[2];
+			pspec[0].sidestep[1] = ( msv[1] * pspec[0].range[2] > t1 ) ? (side_scale* t1 / msv[1]) : pspec[0].range[2];
+	
+			pspec[1].stepsize = ( dt < pspec[1].range[2] ) ? dt : pspec[1].range[2];
+			pspec[1].sidestep[0] = ( mtv[0] * pspec[1].range[2] > t1 ) ? (side_scale*t1 / mtv[0]) : pspec[1].range[2];
+			pspec[1].sidestep[1] = ( mtv[1] * pspec[1].range[2] > t1 ) ? (side_scale*t1 / mtv[1]) : pspec[1].range[2];
+		    } else {
+			pspec[0].stepsize = ( t1 < ms * pspec[0].range[2] ) ? (t1 / ms) : pspec[0].range[2];
+			pspec[0].sidestep[0] = ( msv[0] * pspec[0].range[2] > t1 ) ? (t1 / msv[0]) : pspec[0].range[2];
+			pspec[0].sidestep[1] = ( msv[1] * pspec[0].range[2] > t1 ) ? (t1 / msv[1]) : pspec[0].range[2];
+	
+			pspec[1].singleStep();
+		    }
+		} else {
+		    if( mt != 0.0 ) {
+			pspec[0].singleStep();
+
+			pspec[1].stepsize = ( t1 < mt * pspec[1].range[2] ) ? (t1 / mt) : pspec[1].range[2];
+			pspec[1].sidestep[0] = ( mtv[0] * pspec[1].range[2] > t1 ) ? (t1 / mtv[0]) : pspec[1].range[2];
+			pspec[1].sidestep[1] = ( mtv[1] * pspec[1].range[2] > t1 ) ? (t1 / mtv[1]) : pspec[1].range[2];
+		    } else {
+			pspec[0].singleStep();
+			pspec[1].singleStep();
+		    }
+		}
+	    } else if( mapdesc->isSurfaceAreaSampling() ) {
+		// t is the square root of area
+/*
+		REAL msv[2], mtv[2];
+		REAL ms = mapdesc->calcPartialVelocity( msv, &tmp[0][0][0], trstride, tcstride, pspec[0].order, pspec[1].order, 1, 0, pspec[0].range[2], pspec[1].range[2], 0 );
+		REAL mt = mapdesc->calcPartialVelocity( mtv, &tmp[0][0][0], trstride, tcstride, pspec[0].order, pspec[1].order, 0, 1, pspec[0].range[2], pspec[1].range[2], 1 );
+		if( ms != 0.0 &&  mt != 0.0 ) {
+			REAL d = 1.0 / (ms * mt);
+			t *= M_SQRT2;
+			REAL ds = t * sqrtf( d * pspec[0].range[2] / pspec[1].range[2] );
+			REAL dt = t * sqrtf( d * pspec[1].range[2] / pspec[0].range[2] );
+			pspec[0].stepsize = ( ds < pspec[0].range[2] ) ? ds : pspec[0].range[2];
+			pspec[0].sidestep[0] = ( msv[0] * pspec[0].range[2] > t ) ? (t / msv[0]) : pspec[0].range[2];
+			pspec[0].sidestep[1] = ( msv[1] * pspec[0].range[2] > t ) ? (t / msv[1]) : pspec[0].range[2];
+	
+			pspec[1].stepsize = ( dt < pspec[1].range[2] ) ? dt : pspec[1].range[2];
+			pspec[1].sidestep[0] = ( mtv[0] * pspec[1].range[2] > t ) ? (t / mtv[0]) : pspec[1].range[2];
+			pspec[1].sidestep[1] = ( mtv[1] * pspec[1].range[2] > t ) ? (t / mtv[1]) : pspec[1].range[2];
+		} else {
+		    pspec[0].singleStep();
+		    pspec[1].singleStep();
+		}
+*/
+	    } else {
+		pspec[0].singleStep();
+		pspec[1].singleStep();
+	    }
+	}
+    }
+
+#ifdef DEBUG
+    dprintf( "sidesteps %g %g %g %g, stepsize %g %g\n",
+	pspec[0].sidestep[0], pspec[0].sidestep[1],
+	pspec[1].sidestep[0], pspec[1].sidestep[1],
+	pspec[0].stepsize, pspec[1].stepsize );
+#endif
+
+    if( mapdesc->minsavings != N_NOSAVINGSSUBDIVISION ) {
+	REAL savings = 1./(pspec[0].stepsize * pspec[1].stepsize) ;
+	savings-= (2./( pspec[0].sidestep[0] + pspec[0].sidestep[1] )) * 
+		  (2./( pspec[1].sidestep[0] + pspec[1].sidestep[1] ));
+    
+	savings *= pspec[0].range[2] * pspec[1].range[2];
+	if( savings > mapdesc->minsavings ) {
+	    pspec[0].needsSubdivision = pspec[1].needsSubdivision = 1;
+	}
+    }
+
+    if( pspec[0].stepsize < pspec[0].minstepsize )  pspec[0].needsSubdivision =  1;
+    if( pspec[1].stepsize < pspec[1].minstepsize )  pspec[1].needsSubdivision =  1;
+    needsSampling = (needsSampling ? needsSamplingSubdivision() : 0);
+}
+
+void
+Patchspec::singleStep()
+{
+    stepsize =  sidestep[0] =  sidestep[1] = glu_abs(range[2]);
+}
+
+void 
+Patchspec::getstepsize( REAL max ) // max is number of samples for entire patch
+{
+    stepsize = ( max >= 1.0 ) ? range[2] / max : range[2];
+    if (stepsize < 0.0) {
+       stepsize = -stepsize;
+    }
+    sidestep[0]	=  sidestep[1] = minstepsize = stepsize;
+}
+
+int
+Patch::needsSamplingSubdivision( void )
+{
+    return (pspec[0].needsSubdivision || pspec[1].needsSubdivision) ? 1 : 0;
+}
+
+int
+Patch::needsNonSamplingSubdivision( void )
+{
+    return notInBbox;
+}
+
+int
+Patch::needsSubdivision( int param )
+{
+    return pspec[param].needsSubdivision;
+}
+
+int
+Patch::cullCheck( void )
+{
+    if( cullval == CULL_ACCEPT ) 
+	cullval = mapdesc->cullCheck( cpts, pspec[0].order,  pspec[0].stride,
+					    pspec[1].order,  pspec[1].stride );
+    return cullval;
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/patch.h b/src/glu/sgi/libnurbs/internals/patch.h
new file mode 100644
index 00000000000..74d80dc24a3
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/patch.h
@@ -0,0 +1,100 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * patch.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/patch.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glupatch_h_
+#define __glupatch_h_
+
+#include "types.h"
+#include "defines.h"
+
+class Quilt;
+class Mapdesc;
+
+
+struct Pspec {
+    REAL		range[3];
+    REAL		sidestep[2];
+    REAL		stepsize;
+    REAL		minstepsize;
+    int			needsSubdivision;
+};
+
+struct Patchspec : public Pspec {
+    int			order;
+    int			stride;
+    void 		clamp( REAL );
+    void 		getstepsize( REAL );
+    void		singleStep( void );    
+};
+
+class Patch {
+public:
+friend class Subdivider;
+friend class Quilt;
+friend class Patchlist;
+    			Patch( Quilt *, REAL*, REAL *, Patch * );
+    			Patch( Patch &, int, REAL, Patch * );
+    void		bbox( void );
+    void		clamp( void );
+    void		getstepsize( void );
+    int			cullCheck( void );
+    int			needsSubdivision( int );
+    int			needsSamplingSubdivision( void );
+    int			needsNonSamplingSubdivision( void );
+
+    int                 get_uorder() {return pspec[0].order;}
+    int                 get_vorder() {return pspec[1].order;}
+
+private:
+
+    Mapdesc*		mapdesc;
+    Patch*		next;
+    int			cullval;
+    int			notInBbox;
+    int			needsSampling;
+    REAL		cpts[MAXORDER*MAXORDER*MAXCOORDS]; //culling pts 
+    REAL		spts[MAXORDER*MAXORDER*MAXCOORDS]; //sampling pts 
+    REAL		bpts[MAXORDER*MAXORDER*MAXCOORDS]; //bbox pts
+    Patchspec		pspec[2];
+    void 		checkBboxConstraint( void );
+    REAL 		bb[2][MAXCOORDS];
+};
+#endif /* __glupatch_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/patchlist.cc b/src/glu/sgi/libnurbs/internals/patchlist.cc
new file mode 100644
index 00000000000..d238bc501fd
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/patchlist.cc
@@ -0,0 +1,172 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * patchlist.c++
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/patchlist.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#include <stdio.h>
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "quilt.h"
+#include "patchlist.h"
+#include "patch.h"
+#include "nurbsconsts.h"
+
+Patchlist::Patchlist( Quilt *quilts, REAL *pta, REAL *ptb )
+{
+    patch = 0;
+    for( Quilt *q = quilts; q; q = q->next ) 
+	patch = new Patch( q, pta, ptb, patch );
+    pspec[0].range[0] = pta[0];
+    pspec[0].range[1] = ptb[0];
+    pspec[0].range[2] = ptb[0] - pta[0];
+ 
+    pspec[1].range[0] = pta[1];
+    pspec[1].range[1] = ptb[1];
+    pspec[1].range[2] = ptb[1] - pta[1];
+}
+
+Patchlist::Patchlist( Patchlist &upper, int param,  REAL value)
+{
+    Patchlist &lower = *this;
+    patch = 0;
+    for( Patch *p = upper.patch; p; p = p->next )
+	patch = new Patch( *p, param, value, patch );
+
+    if( param == 0 ) {
+	lower.pspec[0].range[0] = upper.pspec[0].range[0];
+	lower.pspec[0].range[1] = value;
+	lower.pspec[0].range[2] = value - upper.pspec[0].range[0];
+	upper.pspec[0].range[0] = value;
+	upper.pspec[0].range[2] = upper.pspec[0].range[1] - value;
+	lower.pspec[1] = upper.pspec[1];
+    } else {
+	lower.pspec[0] = upper.pspec[0];
+	lower.pspec[1].range[0] = upper.pspec[1].range[0];
+	lower.pspec[1].range[1] = value;
+	lower.pspec[1].range[2] = value - upper.pspec[1].range[0];
+	upper.pspec[1].range[0] = value;
+	upper.pspec[1].range[2] = upper.pspec[1].range[1] - value;
+    }
+}
+
+Patchlist::~Patchlist()
+{
+    while( patch ) {
+	Patch *p = patch;
+	patch = patch->next;
+	delete p;
+    }
+}
+
+int
+Patchlist::cullCheck( void )
+{
+    for( Patch *p = patch; p; p = p->next )
+	if( p->cullCheck() == CULL_TRIVIAL_REJECT )
+	    return CULL_TRIVIAL_REJECT;
+    return CULL_ACCEPT;
+}
+
+void
+Patchlist::getRanges(REAL ranges[4])
+{
+  ranges[0] = pspec[0].range[0];
+  ranges[1] = pspec[0].range[1];
+  ranges[2] = pspec[1].range[0];
+  ranges[3] = pspec[1].range[1];
+}
+
+void
+Patchlist::getstepsize( void )
+{
+    pspec[0].stepsize    = pspec[0].range[2];
+    pspec[0].sidestep[0] = pspec[0].range[2];
+    pspec[0].sidestep[1] = pspec[0].range[2];
+
+    pspec[1].stepsize    = pspec[1].range[2];
+    pspec[1].sidestep[0] = pspec[1].range[2];
+    pspec[1].sidestep[1] = pspec[1].range[2];
+
+    for( Patch *p = patch; p; p = p->next ) {
+	p->getstepsize();
+	p->clamp();
+	pspec[0].stepsize    =  ((p->pspec[0].stepsize < pspec[0].stepsize) ? p->pspec[0].stepsize : pspec[0].stepsize);
+	pspec[0].sidestep[0] =  ((p->pspec[0].sidestep[0] < pspec[0].sidestep[0]) ? p->pspec[0].sidestep[0] : pspec[0].sidestep[0]);
+	pspec[0].sidestep[1] =  ((p->pspec[0].sidestep[1] < pspec[0].sidestep[1]) ? p->pspec[0].sidestep[1] : pspec[0].sidestep[1]);
+	pspec[1].stepsize    =  ((p->pspec[1].stepsize < pspec[1].stepsize) ? p->pspec[1].stepsize : pspec[1].stepsize);
+	pspec[1].sidestep[0] =  ((p->pspec[1].sidestep[0] < pspec[1].sidestep[0]) ? p->pspec[1].sidestep[0] : pspec[1].sidestep[0]);
+	pspec[1].sidestep[1] =  ((p->pspec[1].sidestep[1] < pspec[1].sidestep[1]) ? p->pspec[1].sidestep[1] : pspec[1].sidestep[1]);
+    }
+}
+
+void
+Patchlist::bbox( void )
+{
+    for( Patch *p = patch; p; p = p->next )
+	p->bbox();
+}
+
+int
+Patchlist::needsNonSamplingSubdivision( void )
+{
+    notInBbox = 0;
+    for( Patch *p = patch; p; p = p->next )
+	notInBbox |= p->needsNonSamplingSubdivision();
+    return notInBbox;
+}
+
+int
+Patchlist::needsSamplingSubdivision( void )
+{
+    pspec[0].needsSubdivision = 0;
+    pspec[1].needsSubdivision = 0;
+
+    for( Patch *p = patch; p; p = p->next ) {
+	pspec[0].needsSubdivision |= p->pspec[0].needsSubdivision;
+	pspec[1].needsSubdivision |= p->pspec[0].needsSubdivision;
+    }
+    return (pspec[0].needsSubdivision || pspec[1].needsSubdivision) ? 1 : 0;
+}
+
+int
+Patchlist::needsSubdivision( int param )
+{
+    return pspec[param].needsSubdivision;
+}
diff --git a/src/glu/sgi/libnurbs/internals/patchlist.h b/src/glu/sgi/libnurbs/internals/patchlist.h
new file mode 100644
index 00000000000..6e14042cddc
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/patchlist.h
@@ -0,0 +1,98 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * patchlist.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/patchlist.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glupatchlist_h_
+#define __glupatchlist_h_
+
+#include "types.h"
+#include "defines.h"
+#include "patch.h"
+
+class Quilt;
+
+class Patchlist {
+friend class Subdivider;
+public:
+    			Patchlist( Quilt *, REAL *, REAL * );
+    			Patchlist( Patchlist &, int ,  REAL );
+    			~Patchlist();	
+    void		bbox();
+    int			cullCheck( void );
+    void		getstepsize( void );
+    int			needsNonSamplingSubdivision( void );
+    int			needsSamplingSubdivision( void );
+    int			needsSubdivision( int );
+    REAL		getStepsize( int );
+    void                getRanges(REAL ranges[4]);
+
+    int                 get_uorder();
+    int                 get_vorder();
+private:
+    Patch		*patch;
+    int			notInBbox;
+    int			needsSampling;
+    Pspec		pspec[2];
+};
+
+inline REAL
+Patchlist::getStepsize( int param )
+{
+    return pspec[param].stepsize;
+}
+
+inline int
+Patchlist::get_uorder()
+{  
+   return patch->get_uorder();
+
+}
+
+inline int
+ Patchlist::get_vorder()
+{ 
+  return patch->get_vorder();
+}
+
+
+
+
+
+#endif /* __glupatchlist_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/pwlarc.h b/src/glu/sgi/libnurbs/internals/pwlarc.h
new file mode 100644
index 00000000000..172472a1a6d
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/pwlarc.h
@@ -0,0 +1,84 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * pwlarc.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/pwlarc.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glupwlarc_h_
+#define __glupwlarc_h_
+
+#include "myassert.h"
+#include "nurbsconsts.h"
+
+class TrimVertex;
+
+class PwlArc : public PooledObj { /* a piecewise-linear arc */
+public:
+    TrimVertex *	pts;		/* sample points */
+    int			npts;		/* number of sample points */
+    long		type;		/* curve type */
+    inline		PwlArc( void );
+    inline		PwlArc( int, TrimVertex * );
+    inline		PwlArc( int, TrimVertex *, long );
+};
+
+inline
+PwlArc::PwlArc( void )
+{
+    type = N_P2D;
+    pts = 0;
+    npts = -1;
+}
+
+inline
+PwlArc::PwlArc( int _npts, TrimVertex *_pts )
+{
+    pts = _pts;
+    npts = _npts;
+    type = N_P2D;
+}
+
+inline
+PwlArc::PwlArc( int _npts, TrimVertex *_pts, long _type )
+{
+    pts = _pts;
+    npts = _npts;
+    type = _type;
+}
+
+#endif /* __glupwlarc_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/quilt.cc b/src/glu/sgi/libnurbs/internals/quilt.cc
new file mode 100644
index 00000000000..0e13eeb72d6
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/quilt.cc
@@ -0,0 +1,278 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * quilt.c++
+ *
+ * $Date: 2002/11/01 23:35:07 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/quilt.cc,v 1.2 2002/11/01 23:35:07 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "quilt.h"
+#include "backend.h"
+#include "mapdesc.h"
+#include "flist.h"
+#include "knotvector.h"
+#include "patchlist.h"
+#include "math.h"     //fglu_abs()
+#include "simplemath.h" //min()
+
+/* local preprocessor definitions */
+#define DEF_PATCH_STEPSIZE	.4
+#define fsizeof(x)		(sizeof(x)/sizeof(REAL))
+
+
+Quilt::Quilt( Mapdesc *_mapdesc )
+{
+    mapdesc = _mapdesc;
+}
+ 
+void
+Quilt::deleteMe( Pool& p )
+{
+    for( Quiltspec *q=qspec; q != eqspec; q++ ) {
+#if 1
+	if( q->breakpoints) delete[] q->breakpoints;  q->breakpoints = 0;
+#else
+	if( q->breakpoints) {
+	   delete[] q->breakpoints;  
+	   q->breakpoints = 0;
+printf("in here\n");
+        }
+#endif
+    }
+    if( cpts ) delete[] cpts;  
+    cpts = 0;
+    PooledObj::deleteMe( p );
+}
+
+void
+Quilt::show( void )
+{
+#ifndef NDEBUG
+    int nc = mapdesc->getNcoords();
+    REAL *ps  = cpts; 
+    ps += qspec[0].offset;
+    ps += qspec[1].offset;
+    for( int i=0; i!= qspec[0].order * qspec[0].width; i++ ) {
+	for( int j = 0; j!= qspec[1].order * qspec[1].width; j++ ) {
+	    for( int k=0; k < nc; k++ )
+		dprintf(  "%g ", ps[i*qspec[0].stride + j*qspec[1].stride + k] );
+	    dprintf(  "\n" );
+	}
+	dprintf(  "\n" );
+    }
+    dprintf( "\n" );
+#endif
+}
+
+/*--------------------------------------------------------------------------
+ * Quilt::select - find which map in each quilt contains the points
+ *			pta and ptb with pta[i] < ptb[i]
+ *--------------------------------------------------------------------------
+ */
+
+void
+Quilt::select( REAL *pta, REAL *ptb )
+{
+    int dim = eqspec - qspec; 
+    int i, j;
+    for( i=0; i<dim; i++) {
+	for( j=qspec[i].width-1; j>=0; j-- )
+	    if( (qspec[i].breakpoints[j] <= pta[i]   ) &&
+	    	(ptb[i] <= qspec[i].breakpoints[j+1] ) ) 
+		 break;
+	assert( j != -1 ); 
+	qspec[i].index = j;
+    }
+}
+
+void 
+Quilt::download( Backend &backend )
+{
+    if( getDimension() == 2 ) {
+	REAL *ps  = cpts; 
+	ps += qspec[0].offset;
+	ps += qspec[1].offset;
+	ps += qspec[0].index * qspec[0].order * qspec[0].stride;
+	ps += qspec[1].index * qspec[1].order * qspec[1].stride;
+	backend.surfpts( mapdesc->getType(), ps, 
+		  qspec[0].stride,
+		  qspec[1].stride,
+		  qspec[0].order,
+		  qspec[1].order,
+		  qspec[0].breakpoints[qspec[0].index],
+		  qspec[0].breakpoints[qspec[0].index+1],
+		  qspec[1].breakpoints[qspec[1].index],
+		  qspec[1].breakpoints[qspec[1].index+1] );
+    } else {
+	REAL *ps  = cpts; 
+	ps += qspec[0].offset;
+	ps += qspec[0].index * qspec[0].order * qspec[0].stride;
+	backend.curvpts( mapdesc->getType(), ps, 
+		      qspec[0].stride,
+		      qspec[0].order,
+		      qspec[0].breakpoints[qspec[0].index],
+		      qspec[0].breakpoints[qspec[0].index+1] );
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * Quilt::downloadAll - download each map that contains the current patch
+ *--------------------------------------------------------------------------
+ */
+
+void
+Quilt::downloadAll( REAL *pta, REAL *ptb, Backend &backend )
+{
+    for( Quilt *m = this; m; m=m->next ) {
+	m->select( pta, ptb );
+	m->download( backend );
+    }
+}
+
+/*--------------------------------------------------------------------------
+  * Quilt::isCulled - determine if an entire quilt is trivially rejected.
+ *--------------------------------------------------------------------------
+ */
+
+int
+Quilt::isCulled( void )
+{
+    if( mapdesc->isCulling() )
+	return mapdesc->xformAndCullCheck( cpts + qspec[0].offset + qspec[1].offset,
+			qspec[0].order * qspec[0].width, qspec[0].stride, 
+			qspec[1].order * qspec[1].width, qspec[1].stride );
+    else
+	return CULL_ACCEPT;
+}
+
+/*---------------------------------------------------------------------------
+ * Quilt::getRange - retrieve the valid paramater range of a set of quilts
+ *---------------------------------------------------------------------------
+ */
+void
+Quilt::getRange( REAL *from, REAL *to, Flist& slist, Flist &tlist )
+{
+    getRange( from, to, 0, slist );
+    getRange( from, to, 1, tlist );
+}
+
+/*---------------------------------------------------------------------------
+ * Quilt::getRange - retrieve the valid paramater range of a set of quilts
+ *---------------------------------------------------------------------------
+ */
+void
+Quilt::getRange( REAL *from, REAL *to, int i, Flist &list )
+{
+    Quilt *maps = this;
+    from[i] = maps->qspec[i].breakpoints[0];
+    to[i]   = maps->qspec[i].breakpoints[maps->qspec[i].width];
+    int maxpts = 0;
+    Quilt_ptr m;    
+    for( m=maps; m; m=m->next ) {
+	if( m->qspec[i].breakpoints[0] > from[i] ) 
+	    from[i] = m->qspec[i].breakpoints[0]; 
+	if( m->qspec[i].breakpoints[m->qspec[i].width] < to[i] ) 
+	    to[i] = m->qspec[i].breakpoints[m->qspec[i].width]; 
+	maxpts += m->qspec[i].width + 1;
+    }
+
+    list.grow( maxpts );
+
+    for( m=maps; m; m=m->next )
+	for( int j=0; j<=m->qspec[i].width; j++ ) {
+	    list.add( m->qspec[i].breakpoints[j] );
+	}
+
+    list.filter( );
+    list.taper( from[i], to[i] );
+}
+
+void
+Quilt::getRange( REAL *from, REAL *to, Flist& slist )
+{
+    getRange( from, to, 0, slist );
+}
+
+void
+Quilt::findRates( Flist& slist, Flist& tlist, REAL rate[2] )
+{
+    findSampleRates( slist, tlist );
+    rate[0] = qspec[0].step_size;
+    rate[1] = qspec[1].step_size;
+
+    for( Quilt *q = next; q; q = q->next ) {
+	q->findSampleRates( slist, tlist );
+	if( q->qspec[0].step_size < rate[0] ) 
+	    rate[0] = q->qspec[0].step_size;
+	if( q->qspec[1].step_size < rate[1] ) 
+	    rate[1] = q->qspec[1].step_size;
+    }
+}
+
+void
+Quilt::findSampleRates( Flist& slist, Flist& tlist )
+{
+    qspec[0].step_size = DEF_PATCH_STEPSIZE * 
+	    (qspec[0].breakpoints[qspec[0].width] - qspec[0].breakpoints[0]); 
+    qspec[1].step_size = DEF_PATCH_STEPSIZE * 
+	    (qspec[1].breakpoints[qspec[1].width] - qspec[1].breakpoints[0]); 
+ 
+    for( int i = slist.start; i < slist.end-1; i++ ) {
+	for( int j = tlist.start; j < tlist.end-1; j++ ) {
+
+	    REAL pta[2], ptb[2];
+	    pta[0] = slist.pts[i];
+	    ptb[0] = slist.pts[i+1];
+	    pta[1] = tlist.pts[j];
+	    ptb[1] = tlist.pts[j+1];
+	    Patchlist patchlist( this, pta, ptb );
+	    patchlist.getstepsize();
+	    
+	    {
+	    float edge_len_s = min(glu_abs(ptb[0]-pta[0]),1.0);
+	    float edge_len_t = min(glu_abs(ptb[1]-pta[1]),1.0);
+
+	    if( patchlist.getStepsize(0)/edge_len_s < qspec[0].step_size ) 
+	       qspec[0].step_size = patchlist.getStepsize(0)/edge_len_s;
+	    if( patchlist.getStepsize(1)/edge_len_t < qspec[1].step_size ) 
+	      qspec[1].step_size = patchlist.getStepsize(1)/edge_len_t;
+	    }
+	}
+    }
+}
diff --git a/src/glu/sgi/libnurbs/internals/quilt.h b/src/glu/sgi/libnurbs/internals/quilt.h
new file mode 100644
index 00000000000..64a4c2ed107
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/quilt.h
@@ -0,0 +1,98 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * quilt.h
+ *
+ * $Date: 2001/08/07 17:34:11 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/quilt.h,v 1.2 2001/08/07 17:34:11 brianp Exp $
+ */
+
+#ifndef __gluquilt_h_
+#define __gluquilt_h_
+
+#include "defines.h"
+#include "bufpool.h"
+#include "types.h"
+
+class Backend;
+class Mapdesc;
+class Flist;
+struct Knotvector;
+
+/* constants for memory allocation of NURBS to Bezier conversion */ 
+#define	MAXDIM 		2
+
+struct Quiltspec { /* a specification for a dimension of a quilt */
+    int			stride;		/* words between points */
+    int			width;		/* number of segments */
+    int			offset;		/* words to first point */
+    int			order;		/* order */
+    int			index;		/* current segment number */
+    int			bdry[2];	/* boundary edge flag */
+    REAL  		step_size;
+    Knot *		breakpoints;
+};
+
+typedef Quiltspec *Quiltspec_ptr;
+    
+class Quilt : public PooledObj { /* an array of bezier patches */
+public:
+    			Quilt( Mapdesc * );
+    Mapdesc *		mapdesc;	/* map descriptor */
+    REAL *		cpts;		/* control points */
+    Quiltspec		qspec[MAXDIM];	/* the dimensional data */
+    Quiltspec_ptr	eqspec;		/* qspec trailer */
+    Quilt		*next;		/* next quilt in linked list */
+			
+public:
+    void		deleteMe( Pool& );
+    void		toBezier( Knotvector &, INREAL *, long  );
+    void		toBezier( Knotvector &, Knotvector &, INREAL *, long  );
+    void		select( REAL *, REAL * );
+    int			getDimension( void ) { return eqspec - qspec; }
+    void 		download( Backend & );
+    void		downloadAll( REAL *, REAL *, Backend & );
+    int 		isCulled( void );
+    void		getRange( REAL *, REAL *, Flist&, Flist & );
+    void		getRange( REAL *, REAL *, int, Flist & );
+    void		getRange( REAL *, REAL *, Flist&  );
+    void		findRates( Flist& slist, Flist& tlist, REAL[2] );
+    void		findSampleRates( Flist& slist, Flist& tlist );
+    void		show();
+};
+
+typedef class Quilt *Quilt_ptr;
+
+#endif /* __gluquilt_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/reader.cc b/src/glu/sgi/libnurbs/internals/reader.cc
new file mode 100644
index 00000000000..85d60ebf67e
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/reader.cc
@@ -0,0 +1,148 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ *  reader.c++
+ *
+ * $Date: 2002/11/01 23:35:07 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/reader.cc,v 1.2 2002/11/01 23:35:07 brianp Exp $
+ */
+
+#include <stdio.h>
+#include "glimports.h"
+#include "nurbsconsts.h"
+#include "reader.h"
+#include "trimvertex.h"
+#include "simplemath.h"
+
+//when read a pwlCurve, if two consecutive points are the same, then 
+//eliminate one of them. This makes the tessellator more robust. The spec
+//assumes the application makes sure there are no redundant points. 
+//but in Inspector, the trim curves seem to have redundant points a lot.
+//I guess other similar users may have the same problem.
+
+#define ELIMINATE_REDUNDANT_POINTS 
+
+#ifdef  ELIMINATE_REDUNDANT_POINTS 
+#define equal(x,y) ( glu_abs(x-y) <= 0.00001)
+#endif
+
+#ifdef ELIMINATE_REDUNDANT_POINTS 
+O_pwlcurve::O_pwlcurve( long _type, long count, INREAL *array, long byte_stride, TrimVertex *trimpts )
+{
+    next = 0;
+    used = 0;
+    owner = 0;
+    pts = trimpts;
+    npts = (int) count;
+    int i;
+
+    /* copy user data into internal trimming data structures */
+    switch( _type ) {
+        case N_P2D: {
+	    TrimVertex *v = pts;
+            TrimVertex *prev = NULL;
+	    int num = 0;
+	    int doit;
+	    for(i=0; i<count; i++) {
+	        doit = 1;
+         	if(prev != NULL)
+		  {
+		    if(equal(prev->param[0], array[0]) && equal(prev->param[1], array[1]))
+		      {
+			doit = 0;
+		      }
+		  }
+		
+		if(doit)
+		  {
+		    v->param[0] = (REAL) array[0];
+		    v->param[1] = (REAL) array[1];
+		    prev = v;
+		    v++;
+                    num++;
+		  }
+		array = (INREAL *) (((char *) array) + byte_stride);
+	      }
+	    npts = num;
+	    break;
+	}
+        case N_P2DR: {
+	    TrimVertex *v = pts;
+    	    for( TrimVertex *lastv = v + count; v != lastv; v++ ) {
+	        v->param[0] = (REAL) array[0] / (REAL) array[2];
+	        v->param[1] = (REAL) array[1] / (REAL) array[2];
+		array = (INREAL *) (((char *) array) + byte_stride);
+	    }
+	    break;
+	}
+    }
+}
+#else
+O_pwlcurve::O_pwlcurve( long _type, long count, INREAL *array, long byte_stride, TrimVertex *trimpts )
+{
+    next = 0;
+    used = 0;
+    owner = 0;
+    pts = trimpts;
+    npts = (int) count;
+
+    /* copy user data into internal trimming data structures */
+    switch( _type ) {
+        case N_P2D: {
+	    TrimVertex *v = pts;
+    	    for( TrimVertex *lastv = v + count; v != lastv; v++ ) {
+	        v->param[0] = (REAL) array[0];
+	        v->param[1] = (REAL) array[1];
+		array = (INREAL *) (((char *) array) + byte_stride);
+	    }
+	    break;
+	}
+        case N_P2DR: {
+	    TrimVertex *v = pts;
+    	    for( TrimVertex *lastv = v + count; v != lastv; v++ ) {
+	        v->param[0] = (REAL) array[0] / (REAL) array[2];
+	        v->param[1] = (REAL) array[1] / (REAL) array[2];
+		array = (INREAL *) (((char *) array) + byte_stride);
+	    }
+	    break;
+	}
+    }
+}
+#endif 
+
+
+
+
+
diff --git a/src/glu/sgi/libnurbs/internals/reader.h b/src/glu/sgi/libnurbs/internals/reader.h
new file mode 100644
index 00000000000..8ba8331e861
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/reader.h
@@ -0,0 +1,138 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * reader.h
+ *
+ * $Date: 2001/08/07 17:34:11 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/reader.h,v 1.2 2001/08/07 17:34:11 brianp Exp $
+ */
+
+#ifndef __glureader_h_
+#define __glureader_h_
+
+#include "bufpool.h"
+#include "types.h"
+
+enum Curvetype { ct_nurbscurve, ct_pwlcurve, ct_none };
+    
+struct Property;
+struct O_surface;
+struct O_nurbssurface;
+struct O_trim;
+class O_pwlcurve;
+struct O_nurbscurve;
+struct O_curve;
+class  Quilt;
+class TrimVertex;
+
+
+struct O_curve : public PooledObj {
+    union {
+        O_nurbscurve	*o_nurbscurve;
+        O_pwlcurve	*o_pwlcurve;
+    } curve;
+    Curvetype		curvetype;	/* arc type: pwl or nurbs	*/
+    O_curve *		next;		/* next arc in loop		*/
+    O_surface *		owner;		/* owning surface		*/
+    int			used;		/* curve called in cur surf	*/
+    int			save;		/* 1 if in display list		*/
+    long		nuid;
+    			O_curve() { next = 0; used = 0; owner = 0; 
+				    curve.o_pwlcurve = 0; }
+    };
+
+struct O_nurbscurve : public PooledObj {
+    Quilt		*bezier_curves;	/* array of bezier curves	*/
+    long		type;		/* range descriptor		*/
+    REAL		tesselation;	/* tesselation tolerance 	*/
+    int			method;		/* tesselation method 		*/
+    O_nurbscurve *	next;		/* next curve in list		*/
+    int			used;		/* curve called in cur surf	*/
+    int			save;		/* 1 if in display list		*/
+    O_curve *		owner;		/* owning curve 		*/
+			O_nurbscurve( long _type ) 
+			   { type = _type; owner = 0; next = 0; used = 0; }
+    };
+ 
+class O_pwlcurve : public PooledObj {
+public:
+    TrimVertex		*pts;		/* array of trim vertices	*/
+    int			npts;		/* number of trim vertices	*/
+    O_pwlcurve *	next;		/* next curve in list		*/
+    int			used;		/* curve called in cur surf	*/
+    int			save;		/* 1 if in display list		*/
+    O_curve *		owner;		/* owning curve 		*/
+			O_pwlcurve( long, long, INREAL *, long, TrimVertex * );
+    };
+
+struct O_trim : public PooledObj {
+    O_curve		*o_curve;	/* closed trim loop	 	*/
+    O_trim *		next;		/* next loop along trim 	*/
+    int			save;		/* 1 if in display list		*/
+			O_trim() { next = 0; o_curve = 0; }
+    };
+
+struct O_nurbssurface : public PooledObj {
+    Quilt *		bezier_patches;/* array of bezier patches	*/
+    long		type;		/* range descriptor		*/
+    O_surface *		owner;		/* owning surface		*/
+    O_nurbssurface *	next;		/* next surface in chain	*/
+    int			save;		/* 1 if in display list		*/
+    int			used;		/* 1 if prev called in block	*/
+			O_nurbssurface( long _type ) 
+			   { type = _type; owner = 0; next = 0; used = 0; }
+    };
+
+struct O_surface : public PooledObj {
+    O_nurbssurface *	o_nurbssurface;	/* linked list of surfaces	*/
+    O_trim *		o_trim;		/* list of trim loops		*/
+    int			save;		/* 1 if in display list		*/
+    long		nuid;
+			O_surface() { o_trim = 0; o_nurbssurface = 0; }
+    };
+
+struct Property : public PooledObj {
+    long		type;
+    long		tag;
+    REAL		value;
+    int			save;		/* 1 if in display list		*/
+			Property( long _type, long _tag, INREAL _value )
+			{ type = _type; tag = _tag; value = (REAL) _value; }
+			Property( long _tag, INREAL _value )
+			{ type = 0; tag = _tag; value = (REAL) _value; }
+    };
+
+class NurbsTessellator;
+#endif /* __glureader_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/renderhints.cc b/src/glu/sgi/libnurbs/internals/renderhints.cc
new file mode 100644
index 00000000000..3349b27d3f7
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/renderhints.cc
@@ -0,0 +1,135 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * renderhints.c++
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/renderhints.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "mystdio.h"
+#include "renderhints.h"
+#include "defines.h"
+#include "nurbsconsts.h"
+
+
+/*--------------------------------------------------------------------------
+ * Renderhints::Renderhints - set all window specific options
+ *--------------------------------------------------------------------------
+ */
+Renderhints::Renderhints()
+{
+    display_method 	= N_FILL;
+    errorchecking 	= N_MSG;
+    subdivisions 	= 6.0;
+    tmp1 		= 0.0;
+}
+
+void
+Renderhints::init( void )
+{
+    maxsubdivisions = (int) subdivisions;
+    if( maxsubdivisions < 0 ) maxsubdivisions = 0;
+
+
+    if( display_method == N_FILL ) {
+	wiretris = 0;
+	wirequads = 0;
+    } else if( display_method == N_OUTLINE_TRI ) {
+	wiretris = 1;
+	wirequads = 0;
+    } else if( display_method == N_OUTLINE_QUAD ) {
+	wiretris = 0;
+	wirequads = 1;
+    } else {
+	wiretris = 1;
+	wirequads = 1;
+    }
+}
+
+int
+Renderhints::isProperty( long property )
+{
+    switch ( property ) {
+	case N_DISPLAY:
+	case N_ERRORCHECKING:
+	case N_SUBDIVISIONS:
+        case N_TMP1:
+	    return 1;
+	default:
+	    return 0;
+    }
+}
+
+REAL 
+Renderhints::getProperty( long property )
+{
+    switch ( property ) {
+	case N_DISPLAY:
+	    return display_method;
+	case N_ERRORCHECKING:
+	    return errorchecking;
+	case N_SUBDIVISIONS:
+	    return subdivisions;
+        case N_TMP1:
+	    return tmp1;
+	default:
+	    abort();
+	    return -1;  //not necessary, needed to shut up compiler
+    }
+}
+
+void 
+Renderhints::setProperty( long property, REAL value )
+{
+    switch ( property ) {
+	case N_DISPLAY:
+	    display_method = value;
+	    break;
+	case N_ERRORCHECKING:
+	    errorchecking = value;
+	    break;
+	case N_SUBDIVISIONS:
+	    subdivisions = value;
+	    break;
+	case N_TMP1: /* unused */
+	    tmp1 = value;
+	    break;
+	default:
+	    abort();
+	    break;
+    }
+}
diff --git a/src/glu/sgi/libnurbs/internals/renderhints.h b/src/glu/sgi/libnurbs/internals/renderhints.h
new file mode 100644
index 00000000000..ee526be04e7
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/renderhints.h
@@ -0,0 +1,66 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * renderhints.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/renderhints.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glurenderhints_h_
+#define __glurenderhints_h_
+
+#include "types.h"
+
+class Renderhints {
+public:
+    			Renderhints( void );
+    void		init( void );
+    int			isProperty( long );
+    REAL 		getProperty( long );
+    void		setProperty( long, REAL );
+
+    REAL 		display_method;		/* display mode */
+    REAL 		errorchecking;		/* activate error checking */
+    REAL 		subdivisions;		/* maximum number of subdivisions per patch */
+    REAL 		tmp1;			/* unused */
+
+    int			displaydomain;
+    int			maxsubdivisions;
+    int			wiretris;
+    int			wirequads;
+};
+
+#endif /* __glurenderhints_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/simplemath.h b/src/glu/sgi/libnurbs/internals/simplemath.h
new file mode 100644
index 00000000000..4948aec58bf
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/simplemath.h
@@ -0,0 +1,56 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * simplemath.h
+ *
+ * $Date: 2002/11/01 23:35:07 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/simplemath.h,v 1.2 2002/11/01 23:35:07 brianp Exp $
+ */
+
+#ifndef __glusimplemath_h_
+#define __glusimplemath_h_
+
+/* simple inline routines */
+
+inline int 
+max( int x, int y ) { return ( x < y ) ? y : x; }
+
+inline REAL 
+min( REAL x, REAL y ) { return ( x > y ) ? y : x; }
+
+inline REAL 
+glu_abs( REAL x ) { return ( x < 0.0 ) ? -x : x; }
+
+#endif /* __glusimplemath_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/slicer.cc b/src/glu/sgi/libnurbs/internals/slicer.cc
new file mode 100644
index 00000000000..9b72f0a6b28
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/slicer.cc
@@ -0,0 +1,1302 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * slicer.c++
+ *
+ * $Date: 2005/10/28 13:09:08 $ $Revision: 1.4.26.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/slicer.cc,v 1.4.26.1 2005/10/28 13:09:08 brianp Exp $
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include "glimports.h"
+#include "mystdio.h"
+#include "myassert.h"
+#include "bufpool.h"
+#include "slicer.h"
+#include "backend.h"
+#include "arc.h"
+#include "gridtrimvertex.h"
+#include "simplemath.h"
+#include "trimvertex.h"
+#include "varray.h"
+
+#include "polyUtil.h" //for area()
+
+//static int count=0;
+
+/*USE_OPTTT is initiated in trimvertex.h*/
+
+#ifdef USE_OPTTT
+	#include <GL/gl.h>
+#endif
+
+//#define USE_READ_FLAG //whether to use new or old tesselator
+                          //if defined, it reads "flagFile", 
+                          // if the number is 1, then use new tess
+                          // otherwise, use the old tess.
+                         //if not defined, then use new tess.
+#ifdef USE_READ_FLAG
+static Int read_flag(char* name);
+Int newtess_flag = read_flag("flagFile");
+#endif
+
+//#define COUNT_TRIANGLES
+#ifdef COUNT_TRIANGLES
+Int num_triangles = 0;
+Int num_quads = 0;
+#endif
+
+#define max(a,b) ((a>b)? a:b)
+#define ZERO 0.00001 /*determing whether a loop is a rectngle or not*/
+#define equalRect(a,b) ((glu_abs(a-b) <= ZERO)? 1:0) //only used in tessellating a rectangle
+
+#if 0 // UNUSED
+static Int is_Convex(Arc_ptr loop)
+{
+  if(area(loop->tail(), loop->head(), loop->next->head()) <0 )
+    return 0;
+  for(Arc_ptr jarc = loop->next; jarc != loop; jarc = jarc->next)
+    {
+      if(area(jarc->tail(), jarc->head(), jarc->next->head()) < 0)
+	return 0;
+    }
+  return 1;
+}
+#endif
+
+/******triangulate a monotone polygon**************/
+#include "monoTriangulation.h"
+#if 0 // UNUSED
+static int is_U_monotone(Arc_ptr loop)
+{
+  int n_changes=0;
+  int prev_sign;
+  int cur_sign;
+  Arc_ptr temp;
+
+  cur_sign = compV2InX(loop->head(), loop->tail());
+
+  n_changes  = (compV2InX(loop->prev->head(), loop->prev->tail())
+		!= cur_sign);
+
+  for(temp=loop->next; temp != loop; temp = temp->next)
+    {
+      prev_sign = cur_sign;
+      cur_sign = compV2InX(temp->head(), temp->tail());
+      if(cur_sign != prev_sign)
+       {
+#ifdef DEBUG
+	 printf("***change signe\n");
+#endif
+	 n_changes++;
+       }
+    }
+  if(n_changes == 2) return 1;
+  else
+    return 0;
+}
+#endif
+
+inline int compInY(REAL a[2], REAL b[2])
+{
+  if(a[1] < b[1])
+    return -1;
+  else if (a[1] > b[1])
+    return 1;
+  else if(a[0] > b[0])
+    return 1;
+  else return -1;
+}
+
+void monoTriangulationLoop(Arc_ptr loop, Backend& backend, primStream* pStream)
+{
+  int i;
+  //find the top, bottom, increasing and decreasing chain
+  //then call monoTrianulation
+  Arc_ptr jarc, temp;
+  Arc_ptr top;
+  Arc_ptr bot;
+  top = bot = loop;
+  if(compInY(loop->tail(), loop->prev->tail()) < 0)
+    {
+      //first find bot
+      for(temp = loop->next; temp != loop; temp = temp->next)
+	{
+	  if(compInY(temp->tail(), temp->prev->tail()) > 0)
+	    break;
+	}
+      bot = temp->prev;
+      //then find top
+      for(temp=loop->prev; temp != loop; temp = temp->prev)
+	{
+	  if(compInY(temp->tail(), temp->prev->tail()) > 0)
+	    break;
+	}
+      top = temp;
+    }
+  else //loop > loop->prev
+    {
+      for(temp=loop->next; temp != loop; temp = temp->next)
+	{
+	  if(compInY(temp->tail(), temp->prev->tail()) < 0)
+	    break;
+	}
+      top = temp->prev;
+      for(temp=loop->prev; temp != loop; temp = temp->prev)
+	{
+	  if(compInY(temp->tail(), temp->prev->tail()) < 0)
+	    break;
+	}
+      bot = temp;
+    }
+  //creat increase and decrease chains
+  vertexArray inc_chain(50); //this is a dynamci array
+  for(i=1; i<=top->pwlArc->npts-2; i++) 
+    {
+      //the first vertex is the top which doesn't below to inc_chain
+      inc_chain.appendVertex(top->pwlArc->pts[i].param);
+    }
+  for(jarc=top->next; jarc != bot; jarc = jarc->next)
+    {
+      for(i=0; i<=jarc->pwlArc->npts-2; i++)
+	{
+	  inc_chain.appendVertex(jarc->pwlArc->pts[i].param);
+	}
+      
+    }
+  vertexArray dec_chain(50);
+  for(jarc = top->prev; jarc != bot; jarc = jarc->prev)
+    {
+      for(i=jarc->pwlArc->npts-2; i>=0; i--)
+	{
+	  dec_chain.appendVertex(jarc->pwlArc->pts[i].param);
+	}
+    }
+  for(i=bot->pwlArc->npts-2; i>=1; i--)
+    {
+      dec_chain.appendVertex(jarc->pwlArc->pts[i].param);
+    }	  
+
+  monoTriangulationRec(top->tail(), bot->tail(), &inc_chain, 0,
+		       &dec_chain, 0, &backend);
+
+}
+
+/********tesselate a rectanlge (OPTIMIZATION**************/
+static void triangulateRectGen(Arc_ptr loop, int n_ulines, int n_vlines, Backend& backend);
+
+static Int is_rect(Arc_ptr loop)
+{
+  Int nlines =1;
+  for(Arc_ptr jarc = loop->next; jarc != loop; jarc = jarc->next)
+    {
+      nlines++;
+      if(nlines == 5)
+	break;
+    }
+  if(nlines != 4)
+    return 0;
+
+
+/*
+printf("here1\n");
+printf("loop->tail=(%f,%f)\n", loop->tail()[0], loop->tail()[1]);
+printf("loop->head=(%f,%f)\n", loop->head()[0], loop->head()[1]);
+printf("loop->next->tail=(%f,%f)\n", loop->next->tail()[0], loop->next->tail()[1]);
+printf("loop->next->head=(%f,%f)\n", loop->next->head()[0], loop->next->head()[1]);
+if(fglu_abs(loop->tail()[0] - loop->head()[0])<0.000001)
+	printf("equal 1\n");
+if(loop->next->tail()[1] == loop->next->head()[1])
+	printf("equal 2\n");
+*/
+
+  if( (glu_abs(loop->tail()[0] - loop->head()[0])<=ZERO) && 
+      (glu_abs(loop->next->tail()[1] - loop->next->head()[1])<=ZERO) &&
+      (glu_abs(loop->prev->tail()[1] - loop->prev->head()[1])<=ZERO) &&
+      (glu_abs(loop->prev->prev->tail()[0] - loop->prev->prev->head()[0])<=ZERO)
+     )
+    return 1;
+  else if
+    ( (glu_abs(loop->tail()[1] - loop->head()[1]) <= ZERO) && 
+      (glu_abs(loop->next->tail()[0] - loop->next->head()[0]) <= ZERO) &&
+      (glu_abs(loop->prev->tail()[0] - loop->prev->head()[0]) <= ZERO) &&
+      (glu_abs(loop->prev->prev->tail()[1] - loop->prev->prev->head()[1]) <= ZERO)
+     )
+      return 1;
+  else
+    return 0;
+}
+
+
+//a line with the same u for opt
+#ifdef USE_OPTTT
+static void evalLineNOGE_BU(TrimVertex *verts, int n, Backend& backend)
+{
+  int i;
+  backend.preEvaluateBU(verts[0].param[0]);
+  for(i=0; i<n; i++)
+    backend.tmeshvertNOGE_BU(&verts[i]);
+}
+#endif
+
+//a line with the same v for opt
+#ifdef USE_OPTTT
+static void evalLineNOGE_BV(TrimVertex *verts, int n, Backend& backend)
+{
+  int i;
+  backend.preEvaluateBV(verts[0].param[1]);
+
+  for(i=0; i<n; i++)
+    backend.tmeshvertNOGE_BV(&verts[i]);
+}
+#endif
+
+#ifdef USE_OPTTT
+static void evalLineNOGE(TrimVertex *verts, int n, Backend& backend)
+{
+
+  if(verts[0].param[0] == verts[n-1].param[0]) //all u;s are equal
+    evalLineNOGE_BU(verts, n, backend);
+  else if(verts[0].param[1] == verts[n-1].param[1]) //all v's are equal
+    evalLineNOGE_BV(verts, n, backend);
+  else
+    {
+      int i;
+      for(i=0; i<n; i++)
+	backend.tmeshvertNOGE(&verts[i]);
+    }
+}
+#endif
+
+inline void  OPT_OUTVERT(TrimVertex& vv, Backend& backend) 
+{
+
+#ifdef USE_OPTTT
+  glNormal3fv(vv.cache_normal);                         
+  glVertex3fv(vv.cache_point);
+#else
+
+  backend.tmeshvert(&vv);
+
+#endif
+
+}
+
+static void triangulateRectAux(PwlArc* top, PwlArc* bot, PwlArc* left, PwlArc* right, Backend& backend);
+
+static void triangulateRect(Arc_ptr loop, Backend& backend, int TB_or_LR, int ulinear, int vlinear)
+{
+  //we know the loop is a rectangle, but not sure which is top
+  Arc_ptr top, bot, left, right;
+  if(loop->tail()[1] == loop->head()[1])
+    {
+      if(loop->tail()[1] > loop->prev->prev->tail()[1])
+	{
+
+	top = loop;
+	}
+      else{
+
+	top = loop->prev->prev;
+	}
+    }
+  else 
+    {
+      if(loop->tail()[0] > loop->prev->prev->tail()[0])
+	{
+	  //loop is the right arc
+
+	  top = loop->next;
+	}
+      else
+	{
+
+	  top = loop->prev;
+	}
+    }
+  left = top->next;
+  bot  = left->next;
+  right= bot->next;
+
+  //if u, v are both nonlinear, then if the
+  //boundary is tessellated dense, we also
+  //sample the inside to get a better tesslletant.
+  if( (!ulinear) && (!vlinear))
+    {
+      int nu = top->pwlArc->npts;
+      if(nu < bot->pwlArc->npts)
+	nu = bot->pwlArc->npts;
+      int nv = left->pwlArc->npts;
+      if(nv < right->pwlArc->npts)
+	nv = right->pwlArc->npts;
+/*
+      if(nu > 2 && nv > 2)
+	{
+	  triangulateRectGen(top, nu-2,  nv-2, backend);
+	  return;
+	}
+*/
+    }
+
+  if(TB_or_LR == 1)
+    triangulateRectAux(top->pwlArc, bot->pwlArc, left->pwlArc, right->pwlArc, backend);
+  else if(TB_or_LR == -1)
+    triangulateRectAux(left->pwlArc, right->pwlArc, bot->pwlArc, top->pwlArc, backend);    
+  else
+    {
+      Int maxPointsTB = top->pwlArc->npts + bot->pwlArc->npts;
+      Int maxPointsLR = left->pwlArc->npts + right->pwlArc->npts;
+      
+      if(maxPointsTB < maxPointsLR)
+	triangulateRectAux(left->pwlArc, right->pwlArc, bot->pwlArc, top->pwlArc, backend);    
+      else
+	triangulateRectAux(top->pwlArc, bot->pwlArc, left->pwlArc, right->pwlArc, backend);
+    }
+}
+
+static void triangulateRectAux(PwlArc* top, PwlArc* bot, PwlArc* left, PwlArc* right, Backend& backend)
+{ //if(maxPointsTB >= maxPointsLR)
+    {
+
+      Int d, topd_left, topd_right, botd_left, botd_right, i,j;
+      d = left->npts /2;
+
+#ifdef USE_OPTTT
+      evalLineNOGE(top->pts, top->npts, backend);
+      evalLineNOGE(bot->pts, bot->npts, backend);
+      evalLineNOGE(left->pts, left->npts, backend);
+      evalLineNOGE(right->pts, right->npts, backend);
+#endif
+
+      if(top->npts == 2) {
+	backend.bgntfan();
+	OPT_OUTVERT(top->pts[0], backend);//the root
+	for(i=0; i<left->npts; i++){
+	  OPT_OUTVERT(left->pts[i], backend);
+	}
+	for(i=1; i<= bot->npts-2; i++){
+	  OPT_OUTVERT(bot->pts[i], backend);
+	}
+	backend.endtfan();
+	
+	backend.bgntfan();
+	OPT_OUTVERT(bot->pts[bot->npts-2], backend);
+	for(i=0; i<right->npts; i++){
+	  OPT_OUTVERT(right->pts[i], backend);
+	}
+	backend.endtfan();
+      }
+      else if(bot->npts == 2) {
+	backend.bgntfan();
+	OPT_OUTVERT(bot->pts[0], backend);//the root
+	for(i=0; i<right->npts; i++){
+	  OPT_OUTVERT(right->pts[i], backend);
+	}
+	for(i=1; i<= top->npts-2; i++){
+	  OPT_OUTVERT(top->pts[i], backend);
+	}
+	backend.endtfan();
+	
+	backend.bgntfan();
+	OPT_OUTVERT(top->pts[top->npts-2], backend);
+	for(i=0; i<left->npts; i++){
+	  OPT_OUTVERT(left->pts[i], backend);
+	}
+	backend.endtfan();
+      }
+      else { //both top and bot have >=3 points
+	
+	backend.bgntfan();
+	
+	OPT_OUTVERT(top->pts[top->npts-2], backend);
+	
+	for(i=0; i<=d; i++)
+	  {
+	    OPT_OUTVERT(left->pts[i], backend);	  
+	  }
+	backend.endtfan();
+	
+	backend.bgntfan();
+	
+	OPT_OUTVERT(bot->pts[1], backend);
+	
+	OPT_OUTVERT(top->pts[top->npts-2], backend);
+	
+	for(i=d; i< left->npts; i++)
+	  {      
+	    OPT_OUTVERT(left->pts[i], backend);      
+	  }
+	backend.endtfan();
+
+	d = right->npts/2;
+	//output only when d<right->npts-1 and
+	//
+	if(d<right->npts-1)
+	  {	
+	    backend.bgntfan();
+	    //      backend.tmeshvert(& top->pts[1]);
+	    OPT_OUTVERT(top->pts[1], backend);
+	    for(i=d; i< right->npts; i++)
+	      {
+		//	  backend.tmeshvert(& right->pts[i]);
+		
+		OPT_OUTVERT(right->pts[i], backend);
+		
+	      }
+	    backend.endtfan();
+	  }
+	
+	backend.bgntfan();
+	//      backend.tmeshvert(& bot->pts[bot->npts-2]);
+	OPT_OUTVERT( bot->pts[bot->npts-2], backend);
+	for(i=0; i<=d; i++)
+	  {
+	    //	  backend.tmeshvert(& right->pts[i]);
+	    OPT_OUTVERT(right->pts[i], backend);
+	    
+	  }
+	
+	//      backend.tmeshvert(& top->pts[1]);
+	OPT_OUTVERT(top->pts[1], backend);      
+	
+	backend.endtfan();
+
+
+	topd_left = top->npts-2;
+	topd_right = 1; //topd_left>= topd_right
+
+	botd_left = 1;
+	botd_right = bot->npts-2; //botd_left<= bot_dright
+
+	
+	if(top->npts < bot->npts)
+	  {
+	    int delta=bot->npts - top->npts;
+	    int u = delta/2;
+	    botd_left = 1+ u;
+	    botd_right = bot->npts-2-( delta-u);	    
+	
+	    if(botd_left >1)
+	      {
+		backend.bgntfan();
+		//	  backend.tmeshvert(& top->pts[top->npts-2]);
+		OPT_OUTVERT(top->pts[top->npts-2], backend);
+		for(i=1; i<= botd_left; i++)
+		  {
+		    //	      backend.tmeshvert(& bot->pts[i]);
+		    OPT_OUTVERT(bot->pts[i] , backend);
+		  }
+		backend.endtfan();
+	      }
+	    if(botd_right < bot->npts-2)
+	      {
+		backend.bgntfan();
+		OPT_OUTVERT(top->pts[1], backend);
+		for(i=botd_right; i<= bot->npts-2; i++)
+		  OPT_OUTVERT(bot->pts[i], backend);
+		backend.endtfan();
+	      }
+	  }
+	else if(top->npts> bot->npts)
+	  {
+	    int delta=top->npts-bot->npts;
+	    int u = delta/2;
+	    topd_left = top->npts-2 - u;
+	    topd_right = 1+delta-u;
+	    
+	    if(topd_left < top->npts-2)
+	      {
+		backend.bgntfan();
+		//	  backend.tmeshvert(& bot->pts[1]);
+		OPT_OUTVERT(bot->pts[1], backend);
+		for(i=topd_left; i<= top->npts-2; i++)
+		  {
+		    //	      backend.tmeshvert(& top->pts[i]);
+		    OPT_OUTVERT(top->pts[i], backend);
+		  }
+		backend.endtfan();
+	      }
+	    if(topd_right > 1)
+	      {
+		backend.bgntfan();
+		OPT_OUTVERT(bot->pts[bot->npts-2], backend);
+		for(i=1; i<= topd_right; i++)
+		  OPT_OUTVERT(top->pts[i], backend);
+		backend.endtfan();
+	      }
+	  }
+	
+	if(topd_left <= topd_right) 
+	  return;
+
+	backend.bgnqstrip();
+	for(j=botd_left, i=topd_left; i>=topd_right; i--,j++)
+	  {
+	    //	  backend.tmeshvert(& top->pts[i]);
+	    //	  backend.tmeshvert(& bot->pts[j]);
+	    OPT_OUTVERT(top->pts[i], backend);
+	    OPT_OUTVERT(bot->pts[j], backend);
+	  }
+	backend.endqstrip();
+	
+      }
+    }
+}
+
+  
+static void triangulateRectCenter(int n_ulines, REAL* u_val, 
+				  int n_vlines, REAL* v_val,
+				  Backend& backend)
+{
+
+  // XXX this code was patched by Diego Santa Cruz <[email protected]>
+  // to fix a problem in which glMapGrid2f() was called with bad parameters.
+  // This has beens submitted to SGI but not integrated as of May 1, 2001.
+  if(n_ulines>1 && n_vlines>1) {
+    backend.surfgrid(u_val[0], u_val[n_ulines-1], n_ulines-1, 
+                     v_val[n_vlines-1], v_val[0], n_vlines-1);
+    backend.surfmesh(0,0,n_ulines-1,n_vlines-1);
+  }
+
+  return;
+
+  /*
+  for(i=0; i<n_vlines-1; i++)
+    {
+
+      backend.bgnqstrip();
+      for(j=0; j<n_ulines; j++)
+	{
+	  trimVert.param[0] = u_val[j];
+	  trimVert.param[1] = v_val[i+1];
+	  backend.tmeshvert(& trimVert);	  
+
+	  trimVert.param[1] = v_val[i];
+	  backend.tmeshvert(& trimVert);	  
+	}
+      backend.endqstrip();
+
+    }
+    */
+}
+
+//it works for top, bot, left ad right, you need ot select correct arguments
+static void triangulateRectTopGen(Arc_ptr arc, int n_ulines, REAL* u_val, Real v, int dir, int is_u, Backend& backend)
+{
+
+  if(is_u)
+    {
+      int i,k;
+      REAL* upper_val = (REAL*) malloc(sizeof(REAL) * arc->pwlArc->npts);
+      assert(upper_val);
+      if(dir)
+	{
+	  for(k=0,i=arc->pwlArc->npts-1; i>=0; i--,k++)
+	    {
+	      upper_val[k] = arc->pwlArc->pts[i].param[0];
+	    }	
+	  backend.evalUStrip(arc->pwlArc->npts, arc->pwlArc->pts[0].param[1],
+			     upper_val,
+			     n_ulines, v, u_val);
+	}
+      else
+	{
+	  for(k=0,i=0;  i<arc->pwlArc->npts; i++,k++)
+	    {
+	      upper_val[k] = arc->pwlArc->pts[i].param[0];
+
+	    }		  
+
+	  backend.evalUStrip(
+			     n_ulines, v, u_val,
+			     arc->pwlArc->npts, arc->pwlArc->pts[0].param[1], upper_val
+			     );	 
+	}
+
+      free(upper_val);
+      return;
+    }
+  else //is_v
+    {
+      int i,k;
+      REAL* left_val = (REAL*) malloc(sizeof(REAL) * arc->pwlArc->npts);
+      assert(left_val);   
+      if(dir)
+	{
+	  for(k=0,i=arc->pwlArc->npts-1; i>=0; i--,k++)
+	    {
+	      left_val[k] = arc->pwlArc->pts[i].param[1];
+	    }
+	  backend.evalVStrip(arc->pwlArc->npts, arc->pwlArc->pts[0].param[0],
+			     left_val,
+			     n_ulines, v, u_val);
+	}
+      else 
+	{
+	  for(k=0,i=0;  i<arc->pwlArc->npts; i++,k++)
+	    {
+	      left_val[k] = arc->pwlArc->pts[i].param[1];
+	    }
+	   backend.evalVStrip(
+			     n_ulines, v, u_val,
+			     arc->pwlArc->npts, arc->pwlArc->pts[0].param[0], left_val
+			     );	
+	}
+      free(left_val);
+      return;
+    }
+	
+  //the following is a different version of the above code. If you comment
+  //the above code, the following code will still work. The reason to leave
+  //the folliwng code here is purely for testing purpose.
+  /*
+  int i,j;
+  PwlArc* parc = arc->pwlArc;
+  int d1 = parc->npts-1;
+  int d2 = 0;
+  TrimVertex trimVert;
+  trimVert.nuid = 0;//????
+  REAL* temp_u_val = u_val;
+  if(dir ==0) //have to reverse u_val
+    {
+      temp_u_val = (REAL*) malloc(sizeof(REAL) * n_ulines);
+      assert(temp_u_val);
+      for(i=0; i<n_ulines; i++)
+	temp_u_val[i] = u_val[n_ulines-1-i];
+    }
+  u_val = temp_u_val;
+
+  if(parc->npts > n_ulines)
+    {
+      d1 = n_ulines-1;
+
+      backend.bgntfan();
+      if(is_u){
+	trimVert.param[0] = u_val[0];
+	trimVert.param[1] = v;
+      }
+      else
+	{
+	trimVert.param[1] = u_val[0];
+	trimVert.param[0] = v;
+      }
+	  
+      backend.tmeshvert(& trimVert);
+      for(i=d1; i< parc->npts; i++)
+	backend.tmeshvert(& parc->pts[i]);
+      backend.endtfan();
+
+
+    }
+  else if(parc->npts < n_ulines)
+    {
+      d2 = n_ulines-parc->npts;
+
+
+      backend.bgntfan();
+      backend.tmeshvert(& parc->pts[parc->npts-1]);
+      for(i=0; i<= d2; i++)
+	{
+	  if(is_u){
+	    trimVert.param[0] = u_val[i];
+	    trimVert.param[1] = v;
+	  }
+	  else
+	    {
+	      trimVert.param[1] = u_val[i];
+	      trimVert.param[0] = v;
+	    }
+	  backend.tmeshvert(&trimVert);
+	}
+      backend.endtfan();
+
+    }
+  if(d1>0){
+
+
+    backend.bgnqstrip();
+    for(i=d1, j=d2; i>=0; i--, j++)
+      {
+	backend.tmeshvert(& parc->pts[i]);
+
+	if(is_u){
+	  trimVert.param[0] = u_val[j];
+	  trimVert.param[1] = v;
+	}
+	else{
+	  trimVert.param[1] = u_val[j];
+	  trimVert.param[0] = v;
+	}
+	backend.tmeshvert(&trimVert);
+
+
+	
+      }
+    backend.endqstrip();
+
+
+  }
+  if(dir == 0)  //temp_u_val was mallocated
+    free(temp_u_val);
+ */
+}
+
+//n_ulines is the number of ulines inside, and n_vlines is the number of vlines
+//inside, different from meanings elsewhere!!!
+static void triangulateRectGen(Arc_ptr loop, int n_ulines, int n_vlines, Backend& backend)
+{
+
+  int i;
+  //we know the loop is a rectangle, but not sure which is top
+  Arc_ptr top, bot, left, right;
+
+  if(equalRect(loop->tail()[1] ,  loop->head()[1]))
+    {
+
+      if(loop->tail()[1] > loop->prev->prev->tail()[1])
+	{
+
+	top = loop;
+	}
+      else{
+
+	top = loop->prev->prev;
+	}
+    }
+  else 
+    {
+      if(loop->tail()[0] > loop->prev->prev->tail()[0])
+	{
+	  //loop is the right arc
+
+	  top = loop->next;
+	}
+      else
+	{
+
+	  top = loop->prev;
+	}
+    }
+
+  left = top->next;
+  bot  = left->next;
+  right= bot->next;
+
+#ifdef COUNT_TRIANGLES
+  num_triangles += loop->pwlArc->npts + 
+                 left->pwlArc->npts + 
+                 bot->pwlArc->npts + 
+		  right->pwlArc->npts 
+		      + 2*n_ulines + 2*n_vlines 
+			-8;
+  num_quads += (n_ulines-1)*(n_vlines-1);
+#endif
+/*
+  backend.surfgrid(left->tail()[0], right->tail()[0], n_ulines+1, 
+		   top->tail()[1], bot->tail()[1], n_vlines+1);
+//  if(n_ulines>1 && n_vlines>1)
+    backend.surfmesh(0,0,n_ulines+1,n_vlines+1);
+return;
+*/
+  REAL* u_val=(REAL*) malloc(sizeof(REAL)*n_ulines);
+  assert(u_val);
+  REAL* v_val=(REAL*)malloc(sizeof(REAL) * n_vlines);
+  assert(v_val);
+  REAL u_stepsize = (right->tail()[0] - left->tail()[0])/( (REAL) n_ulines+1);
+  REAL v_stepsize = (top->tail()[1] - bot->tail()[1])/( (REAL) n_vlines+1);
+  Real temp=left->tail()[0]+u_stepsize;
+  for(i=0; i<n_ulines; i++)
+    {
+      u_val[i] = temp;
+      temp += u_stepsize;
+    }
+  temp = bot->tail()[1] + v_stepsize;
+  for(i=0; i<n_vlines; i++)
+    {
+      v_val[i] = temp;
+      temp += v_stepsize;
+    }
+
+  triangulateRectTopGen(top, n_ulines, u_val, v_val[n_vlines-1], 1,1, backend);
+  triangulateRectTopGen(bot, n_ulines, u_val, v_val[0], 0, 1, backend);
+  triangulateRectTopGen(left, n_vlines, v_val, u_val[0], 1, 0, backend);
+  triangulateRectTopGen(right, n_vlines, v_val, u_val[n_ulines-1], 0,0, backend);
+
+
+
+
+  //triangulate the center
+  triangulateRectCenter(n_ulines, u_val, n_vlines, v_val, backend);
+
+  free(u_val);
+  free(v_val);
+  
+}
+
+
+  
+
+/**********for reading newtess_flag from a file**********/
+#ifdef USE_READ_FLAG
+static Int read_flag(char* name)
+{
+  Int ret;
+  FILE* fp = fopen(name, "r");
+  if(fp == NULL)
+    {
+      fprintf(stderr, "can't open file %s\n", name);
+      exit(1);
+    }
+  fscanf(fp, "%i", &ret);
+  fclose(fp);
+  return ret;
+}
+#endif  
+
+/***********nextgen tess****************/
+#include "sampleMonoPoly.h"
+directedLine* arcToDLine(Arc_ptr arc)
+{
+  int i;
+  Real vert[2];
+  directedLine* ret;
+  sampledLine* sline = new sampledLine(arc->pwlArc->npts);
+  for(i=0; i<arc->pwlArc->npts; i++)
+    {
+      vert[0] = arc->pwlArc->pts[i].param[0];
+      vert[1] = arc->pwlArc->pts[i].param[1];
+      sline->setPoint(i, vert);
+    }
+  ret = new directedLine(INCREASING, sline);
+  return ret;
+}
+ 
+/*an pwlArc may not be a straight line*/
+directedLine* arcToMultDLines(directedLine* original, Arc_ptr arc)
+{
+  directedLine* ret = original;
+  int is_linear = 0;
+  if(arc->pwlArc->npts == 2 )
+    is_linear = 1;
+  else if(area(arc->pwlArc->pts[0].param, arc->pwlArc->pts[1].param, arc->pwlArc->pts[arc->pwlArc->npts-1].param) == 0.0)
+    is_linear = 1;
+  
+  if(is_linear)
+    {
+      directedLine *dline = arcToDLine(arc);
+      if(ret == NULL)
+	ret = dline;
+      else
+	ret->insert(dline);
+      return ret;
+    }
+  else /*not linear*/
+    {
+      for(Int i=0; i<arc->pwlArc->npts-1; i++)
+	{
+	  Real vert[2][2];
+	  vert[0][0] = arc->pwlArc->pts[i].param[0];
+	  vert[0][1] = arc->pwlArc->pts[i].param[1];
+	  vert[1][0] = arc->pwlArc->pts[i+1].param[0];
+	  vert[1][1] = arc->pwlArc->pts[i+1].param[1];
+	  
+	  sampledLine *sline = new sampledLine(2, vert);
+	  directedLine *dline = new directedLine(INCREASING, sline);
+	  if(ret == NULL)
+	    ret = dline;
+	  else
+	    ret->insert(dline);
+	}
+      return ret;
+    }
+}
+  
+     
+	
+directedLine* arcLoopToDLineLoop(Arc_ptr loop)
+{
+  directedLine* ret;
+
+  if(loop == NULL)
+    return NULL;
+  ret = arcToMultDLines(NULL, loop);
+//ret->printSingle();
+  for(Arc_ptr temp = loop->next; temp != loop; temp = temp->next){
+    ret = arcToMultDLines(ret, temp);
+//ret->printSingle();
+  }
+
+  return ret;
+}
+
+/*
+void Slicer::evalRBArray(rectBlockArray* rbArray, gridWrap* grid)
+{
+  TrimVertex *trimVert = (TrimVertex*)malloc(sizeof(TrimVertex));
+  trimVert -> nuid = 0;//????
+
+  Real* u_values = grid->get_u_values();
+  Real* v_values = grid->get_v_values();
+
+  Int i,j,k,l;
+
+  for(l=0; l<rbArray->get_n_elements(); l++)
+    {
+      rectBlock* block = rbArray->get_element(l);
+      for(k=0, i=block->get_upGridLineIndex(); i>block->get_lowGridLineIndex(); i--, k++)
+	{
+
+	  backend.bgnqstrip();
+	  for(j=block->get_leftIndices()[k+1]; j<= block->get_rightIndices()[k+1]; j++)
+	    {
+	      trimVert->param[0] = u_values[j];
+	      trimVert->param[1] = v_values[i];
+	      backend.tmeshvert(trimVert);
+
+	      trimVert->param[1] = v_values[i-1];
+	      backend.tmeshvert(trimVert);
+
+	    }
+	  backend.endqstrip();
+
+	}
+    }
+  
+  free(trimVert);
+}
+*/
+
+void Slicer::evalRBArray(rectBlockArray* rbArray, gridWrap* grid)
+{
+  Int i,j,k;
+  
+  Int n_vlines=grid->get_n_vlines();
+  //the reason to switch the position of v_max and v_min is because of the
+  //the orientation problem. glEvalMesh generates quad_strip clockwise, but
+  //we need counter-clockwise.
+  backend.surfgrid(grid->get_u_min(), grid->get_u_max(), grid->get_n_ulines()-1,
+		   grid->get_v_max(), grid->get_v_min(), n_vlines-1);
+
+
+  for(j=0; j<rbArray->get_n_elements(); j++)
+    {
+      rectBlock* block = rbArray->get_element(j);
+      Int low = block->get_lowGridLineIndex();
+      Int high = block->get_upGridLineIndex();
+
+      for(k=0, i=high; i>low; i--, k++)
+	{
+	  backend.surfmesh(block->get_leftIndices()[k+1], n_vlines-1-i, block->get_rightIndices()[k+1]-block->get_leftIndices()[k+1], 1);
+	}
+    }
+}
+
+
+void Slicer::evalStream(primStream* pStream)
+{
+  Int i,j,k;
+  k=0;
+/*  TrimVertex X;*/
+  TrimVertex *trimVert =/*&X*/  (TrimVertex*)malloc(sizeof(TrimVertex));
+  trimVert -> nuid = 0;//???
+  Real* vertices = pStream->get_vertices(); //for efficiency
+  for(i=0; i<pStream->get_n_prims(); i++)
+    {
+
+     //ith primitive  has #vertices = lengths[i], type=types[i]
+      switch(pStream->get_type(i)){
+      case PRIMITIVE_STREAM_FAN:
+
+	backend.bgntfan();
+
+	for(j=0; j<pStream->get_length(i); j++)
+	  {	    
+	    trimVert->param[0] = vertices[k];
+	    trimVert->param[1] = vertices[k+1];
+	    backend.tmeshvert(trimVert);	   
+	    
+//	    backend.tmeshvert(vertices[k], vertices[k+1]);
+	    k += 2;
+	  }
+	backend.endtfan();
+	break;
+	
+      default:
+	fprintf(stderr, "evalStream: not implemented yet\n");
+	exit(1);
+
+      }
+    }
+  free(trimVert);
+}
+	   
+	   
+	    
+
+void Slicer::slice_new(Arc_ptr loop)
+{
+//count++;
+//if(count == 78) count=1;
+//printf("count=%i\n", count);
+//if( ! (4<= count && count <=4)) return;
+
+
+  Int num_ulines;
+  Int num_vlines;
+  Real uMin, uMax, vMin, vMax;
+  Real mydu, mydv;
+  uMin = uMax = loop->tail()[0];
+  vMin = vMax = loop->tail()[1];
+  mydu = (du>0)? du: -du;
+  mydv = (dv>0)? dv: -dv;
+
+  for(Arc_ptr jarc=loop->next; jarc != loop; jarc = jarc->next)
+   {
+
+     if(jarc->tail()[0] < uMin)
+       uMin = jarc->tail()[0];
+     if(jarc->tail()[0] > uMax)
+       uMax = jarc->tail()[0];
+     if(jarc->tail()[1] < vMin)
+       vMin = jarc->tail()[1];
+     if(jarc->tail()[1] > vMax)
+       vMax = jarc->tail()[1];
+   }
+
+  if (uMax == uMin)
+    return; // prevent divide-by-zero.  Jon Perry.  17 June 2002
+
+  if(mydu > uMax - uMin)
+    num_ulines = 2;
+  else
+    {
+      num_ulines = 3 + (Int) ((uMax-uMin)/mydu);
+    }
+  if(mydv>=vMax-vMin)
+    num_vlines = 2;
+  else
+    {
+      num_vlines = 2+(Int)((vMax-vMin)/mydv);
+    }
+
+  Int isRect = is_rect(loop);
+
+  if(isRect && (num_ulines<=2 || num_vlines<=2))
+    {
+      if(vlinear)
+	triangulateRect(loop, backend, 1, ulinear, vlinear);
+      else if(ulinear)
+	triangulateRect(loop, backend, -1, ulinear, vlinear);	
+      else
+	triangulateRect(loop, backend, 0, ulinear, vlinear);		
+    }
+
+   else if(isRect)
+    {
+      triangulateRectGen(loop, num_ulines-2, num_vlines-2, backend); 
+    }
+  else if( (num_ulines<=2 || num_vlines <=2) && ulinear)
+    {
+      monoTriangulationFunBackend(loop, compV2InY, &backend);
+    }
+  else if( (!ulinear) && (!vlinear) && (num_ulines == 2) && (num_vlines > 2))
+    {
+      monoTriangulationFunBackend(loop, compV2InY, &backend);
+    }
+  else 
+    {
+      directedLine* poly = arcLoopToDLineLoop(loop);
+
+      gridWrap grid(num_ulines, num_vlines, uMin, uMax, vMin, vMax);
+      primStream pStream(20, 20);
+      rectBlockArray rbArray(20);
+
+      sampleMonoPoly(poly, &grid, ulinear, vlinear, &pStream, &rbArray);
+
+      evalStream(&pStream);
+
+      evalRBArray(&rbArray, &grid);
+      
+#ifdef COUNT_TRIANGLES
+      num_triangles += pStream.num_triangles();
+      num_quads += rbArray.num_quads();
+#endif
+      poly->deleteSinglePolygonWithSline();      
+    }
+  
+#ifdef COUNT_TRIANGLES
+  printf("num_triangles=%i\n", num_triangles);
+  printf("num_quads = %i\n", num_quads);
+#endif
+}
+
+void Slicer::slice(Arc_ptr loop)
+{
+#ifdef USE_READ_FLAG
+  if(read_flag("flagFile"))
+    slice_new(loop);
+  else
+    slice_old(loop);
+
+#else
+    slice_new(loop);
+#endif
+
+}
+
+  
+
+Slicer::Slicer( Backend &b ) 
+	: CoveAndTiler( b ), Mesher( b ), backend( b )
+{
+    ulinear = 0;
+    vlinear = 0;
+}
+
+Slicer::~Slicer()
+{
+}
+
+void
+Slicer::setisolines( int x )
+{
+    isolines = x;
+}
+
+void
+Slicer::setstriptessellation( REAL x, REAL y )
+{
+    assert(x > 0 && y > 0);
+    du = x;
+    dv = y;
+    setDu( du );
+}
+
+void
+Slicer::slice_old( Arc_ptr loop )
+{
+    loop->markverts();
+
+    Arc_ptr extrema[4];
+    loop->getextrema( extrema );
+
+    unsigned int npts = loop->numpts();
+    TrimRegion::init( npts, extrema[0] );
+
+    Mesher::init( npts );
+
+    long ulines = uarray.init( du, extrema[1], extrema[3] );
+//printf("ulines = %i\n", ulines);
+    Varray varray;
+    long vlines = varray.init( dv, extrema[0], extrema[2] );
+//printf("vlines = %i\n", vlines);
+    long botv = 0;
+    long topv;
+    TrimRegion::init( varray.varray[botv] );
+    getGridExtent( &extrema[0]->pwlArc->pts[0], &extrema[0]->pwlArc->pts[0] );
+
+    for( long quad=0; quad<varray.numquads; quad++ ) {
+	backend.surfgrid( uarray.uarray[0], 
+		       uarray.uarray[ulines-1], 
+	 	       ulines-1, 
+		       varray.vval[quad], 
+		       varray.vval[quad+1], 
+		       varray.voffset[quad+1] - varray.voffset[quad] );
+
+	for( long i=varray.voffset[quad]+1; i <= varray.voffset[quad+1]; i++ ) {
+    	    topv = botv++;
+    	    advance( topv - varray.voffset[quad], 
+		     botv - varray.voffset[quad], 
+		     varray.varray[botv] );
+	    if( i == vlines )
+		getPts( extrema[2] );
+	    else
+		getPts( backend );
+	    getGridExtent();
+            if( isolines ) {
+	        outline();
+	    } else {
+		if( canTile() ) 
+		    coveAndTile();
+		else
+		    mesh();
+	    }
+        }
+   }
+}
+
+
+void
+Slicer::outline( void )
+{
+    GridTrimVertex upper, lower;
+    Hull::init( );
+
+    backend.bgnoutline();
+    while( (nextupper( &upper )) ) {
+	if( upper.isGridVert() )
+	    backend.linevert( upper.g );
+	else
+	    backend.linevert( upper.t );
+    }
+    backend.endoutline();
+
+    backend.bgnoutline();
+    while( (nextlower( &lower )) ) {
+	if( lower.isGridVert() )
+	    backend.linevert( lower.g );
+	else
+	    backend.linevert( lower.t );
+    }
+    backend.endoutline();
+}
+
+
+void
+Slicer::outline( Arc_ptr jarc )
+{
+    jarc->markverts();
+
+    if( jarc->pwlArc->npts >= 2 ) {
+	backend.bgnoutline();
+	for( int j = jarc->pwlArc->npts-1; j >= 0; j--  )
+	    backend.linevert( &(jarc->pwlArc->pts[j]) );
+	backend.endoutline();
+    }
+}
+
+
diff --git a/src/glu/sgi/libnurbs/internals/slicer.h b/src/glu/sgi/libnurbs/internals/slicer.h
new file mode 100644
index 00000000000..69fc75055bf
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/slicer.h
@@ -0,0 +1,90 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * slicer.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/slicer.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __gluslicer_h_
+#define __gluslicer_h_
+
+#include "trimregion.h"
+#include "mesher.h"
+#include "coveandtiler.h"
+#include "primitiveStream.h"
+#include "rectBlock.h"
+
+class Backend;
+class Arc;
+class TrimVertex;
+
+class Slicer : public CoveAndTiler, public Mesher {
+public:
+    			Slicer( Backend & );
+			~Slicer( void );
+    void		slice( Arc_ptr );
+    void		slice_old( Arc_ptr);
+    void		slice_new( Arc_ptr );
+    void                evalStream(primStream* );
+    void                evalRBArray(rectBlockArray* rbArray, gridWrap* grid);
+
+    void		outline( Arc_ptr );
+    void		setstriptessellation( REAL, REAL );
+    void		setisolines( int );
+
+    void                set_ulinear(int ulinear_flag)
+      {
+	ulinear = ulinear_flag;
+      }
+    void                set_vlinear(int vlinear_flag)
+      {
+	vlinear = vlinear_flag;
+      }
+private:
+    Backend&		backend;
+    REAL		oneOverDu;
+    REAL		du, dv;
+    int			isolines;
+
+    void		outline( void );
+    void		initGridlines( void );
+    void		advanceGridlines( long );
+
+    int                ulinear; //indicate whether uorder is 2 or not
+    int                vlinear; //indicate whether vorder is 2 or not
+};
+#endif /* __gluslicer_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/sorter.cc b/src/glu/sgi/libnurbs/internals/sorter.cc
new file mode 100644
index 00000000000..925801de249
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/sorter.cc
@@ -0,0 +1,141 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * sorter.c++
+ *
+ * $Date: 2001/11/29 16:16:55 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/sorter.cc,v 1.2 2001/11/29 16:16:55 kschultz Exp $
+ */
+
+#include "glimports.h"
+#include "sorter.h"
+#include "mystdio.h"
+
+Sorter::Sorter( int _es )
+{
+    es = _es;
+}
+
+void
+Sorter::qsort( void *a, int n )
+{
+    qs1( (char *)a, ((char *)a)+n*es);
+}
+
+int
+Sorter::qscmp( char *, char * )
+{
+    dprintf( "Sorter::qscmp: pure virtual called\n" );
+    return 0;
+}
+
+
+void
+Sorter::qsexc( char *, char * )
+{
+    dprintf( "Sorter::qsexc: pure virtual called\n" );
+}
+
+
+void
+Sorter::qstexc( char *, char *, char * )
+{
+    dprintf( "Sorter::qstexc: pure virtual called\n" );
+}
+
+void
+Sorter::qs1( char *a,  char *l )
+{
+    char *i, *j;
+    char	*lp, *hp;
+    int	c;
+    unsigned int n;
+
+start:
+    if((n=l-a) <= (unsigned int)es)
+	    return;
+    n = es * (n / (2*es));
+    hp = lp = a+n;
+    i = a;
+    j = l-es;
+    while(1) {
+	if(i < lp) {
+	    if((c = qscmp(i, lp)) == 0) {
+		qsexc(i, lp -= es);
+		continue;
+	    }
+	    if(c < 0) {
+		i += es;
+		continue;
+	    }
+	}
+
+loop:
+	if(j > hp) {
+	    if((c = qscmp(hp, j)) == 0) {
+		qsexc(hp += es, j);
+		goto loop;
+	    }
+	    if(c > 0) {
+		if(i == lp) {
+		    qstexc(i, hp += es, j);
+		    i = lp += es;
+		    goto loop;
+		}
+		qsexc(i, j);
+		j -= es;
+		i += es;
+		continue;
+	    }
+	    j -= es;
+	    goto loop;
+	}
+
+	if(i == lp) {
+	    if(lp-a >= l-hp) {
+		qs1(hp+es, l);
+		l = lp;
+	    } else {
+		qs1(a, lp);
+		a = hp+es;
+	    }
+	    goto start;
+	}
+
+	qstexc(j, lp -= es, i);
+	j = hp -= es;
+    }
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/sorter.h b/src/glu/sgi/libnurbs/internals/sorter.h
new file mode 100644
index 00000000000..cc4aecfa82a
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/sorter.h
@@ -0,0 +1,57 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+** 
+** http://oss.sgi.com/projects/FreeB
+** 
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+** 
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+** 
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+**
+** $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+*/
+/*
+** $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/sorter.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+*/
+
+#ifndef __glusorter_h_
+#define __glusorter_h_
+
+class Sorter {
+public:
+			Sorter( int es );
+    void		qsort( void *a, int n );
+
+protected:	
+    virtual int		qscmp( char *, char * );
+    virtual void	qsexc( char *i, char *j );	// i<-j, j<-i 
+    virtual void	qstexc( char *i, char *j, char *k ); // i<-k, k<-j, j<-i 
+
+private:
+    void		qs1( char *, char * );
+    int 		es;
+};
+#endif /* __glusorter_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/splitarcs.cc b/src/glu/sgi/libnurbs/internals/splitarcs.cc
new file mode 100644
index 00000000000..1481d065798
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/splitarcs.cc
@@ -0,0 +1,295 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * splitarcs.c++
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/splitarcs.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mysetjmp.h"
+#include "mystdio.h"
+#include "subdivider.h"
+#include "arcsorter.h"
+#include "arc.h"
+#include "bin.h"
+
+/* local preprocessor definitions */
+#define MAXARCS	10
+
+/*----------------------------------------------------------------------------
+ * Subdivider::split - split trim regions in source bin by line (param == value). 
+ *----------------------------------------------------------------------------
+ */
+
+void
+Subdivider::split( Bin& bin, Bin& left, Bin& right, int param, REAL value )
+{
+    Bin	intersections, unknown; 
+
+    partition( bin, left, intersections, right, unknown, param, value );
+
+    int	count = intersections.numarcs();
+    if( count % 2 ) {
+#ifndef NDEBUG
+	left.show( "left" );
+	intersections.show( "intersections" );
+	right.show( "right" );
+#endif
+	::mylongjmp( jumpbuffer, 29 );
+    }
+
+    Arc_ptr arclist[MAXARCS], *list;
+    if( count >= MAXARCS ) {
+	list = new Arc_ptr[count];
+    } else {
+	list = arclist;
+    }
+
+    Arc_ptr jarc, *last, *lptr;
+    for( last = list; (jarc=intersections.removearc()) != NULL; last++ )
+	*last = jarc;
+
+    if( param == 0 ) { /* sort into increasing t order */
+	ArcSdirSorter sorter(*this);
+	sorter.qsort( list, count );
+	
+        //::qsort ((void *)list, count, sizeof(Arc_ptr), (cmpfunc)compare_s);
+	for( lptr=list; lptr<last; lptr+=2 )
+	    check_s ( lptr[0], lptr[1] );
+	for( lptr=list; lptr<last; lptr+=2 )
+	    join_s ( left, right, lptr[0], lptr[1] );
+	for( lptr=list; lptr != last; lptr++ ) {
+	    if( ((*lptr)->head()[0] <= value) && ((*lptr)->tail()[0] <= value) )
+		left.addarc( *lptr  );
+	    else
+		right.addarc( *lptr  );
+	}
+    } else { /* sort into decreasing s order */
+	ArcTdirSorter sorter(*this);
+	sorter.qsort( list, count );
+        //::qsort ((void *)list, count, sizeof(Arc_ptr), (cmpfunc)compare_t);
+	for( lptr=list; lptr<last; lptr+=2 )
+	    check_t ( lptr[0], lptr[1] );
+	for( lptr=list; lptr<last; lptr+=2 )
+	    join_t ( left, right, lptr[0], lptr[1] );
+	for( lptr=list; lptr != last; lptr++ ) {
+	    if( ((*lptr)->head()[1] <= value) && ((*lptr)->tail()[1] <= value) )
+		left.addarc( *lptr  );
+	    else
+		right.addarc( *lptr  );
+	}
+    }
+
+    if( list != arclist ) delete[] list;
+    unknown.adopt(); 
+}
+
+
+void
+Subdivider::check_s( Arc_ptr jarc1, Arc_ptr jarc2 )
+{
+    assert( jarc1->check( ) != 0 );
+    assert( jarc2->check( ) != 0 );
+    assert( jarc1->next->check( ) != 0 );
+    assert( jarc2->next->check( ) != 0 );
+    assert( jarc1 != jarc2 );
+
+    /* XXX - if these assertions fail, it is due to user error or
+	     undersampling */
+    if( ! ( jarc1->tail()[0] < (jarc1)->head()[0] ) ) {
+#ifndef NDEBUG
+	dprintf( "s difference %f\n",  (jarc1)->tail()[0] - (jarc1)->head()[0] );
+#endif
+	::mylongjmp( jumpbuffer, 28 );
+    }
+
+    if( ! ( jarc2->tail()[0] > (jarc2)->head()[0] ) ) { 
+#ifndef NDEBUG
+	dprintf( "s difference %f\n",  (jarc2)->tail()[0] - (jarc2)->head()[0] );
+#endif
+	::mylongjmp( jumpbuffer, 28 );
+    }
+}
+
+inline void
+Subdivider::link( Arc_ptr jarc1, Arc_ptr jarc2, Arc_ptr up, Arc_ptr down )
+{
+    up->nuid = down->nuid = 0;		// XXX
+
+    up->next = jarc2;
+    down->next = jarc1;
+    up->prev = jarc1->prev;
+    down->prev = jarc2->prev;
+
+    down->next->prev = down;
+    up->next->prev = up;
+    down->prev->next = down;
+    up->prev->next = up;
+}
+
+inline void 
+Subdivider::simple_link( Arc_ptr jarc1, Arc_ptr jarc2 )
+{
+    Arc_ptr tmp = jarc2->prev;
+    jarc2->prev = jarc1->prev;
+    jarc1->prev = tmp;
+    jarc2->prev->next = jarc2;
+    jarc1->prev->next = jarc1;
+}
+
+
+/*----------------------------------------------------------------------------
+ * join - add a pair of oppositely directed jordan arcs between two arcs
+ *----------------------------------------------------------------------------
+ */
+
+void
+Subdivider::join_s( Bin& left, Bin& right, Arc_ptr jarc1, Arc_ptr jarc2 )
+{
+    assert( jarc1->check( ) != 0);
+    assert( jarc2->check( ) != 0);
+    assert( jarc1 != jarc2 );
+
+    if( ! jarc1->getitail() )
+	jarc1 = jarc1->next;
+
+    if( ! jarc2->getitail() )
+	jarc2 = jarc2->next;
+
+    REAL s = jarc1->tail()[0];
+    REAL t1 = jarc1->tail()[1];
+    REAL t2 = jarc2->tail()[1];
+
+    if( t1 == t2 ) {
+	simple_link( jarc1, jarc2 );
+    } else {
+	Arc_ptr newright = new(arcpool) Arc( arc_right, 0 ); 
+	Arc_ptr newleft = new(arcpool) Arc( arc_left, 0 );
+	assert( t1 < t2 );
+	if( isBezierArcType() ) {
+	    arctessellator.bezier( newright, s, s, t1, t2 );
+	    arctessellator.bezier( newleft, s, s, t2, t1 );
+	} else {
+	    arctessellator.pwl_right( newright, s, t1, t2, stepsizes[0] );
+	    arctessellator.pwl_left( newleft, s, t2, t1, stepsizes[2] );
+	}
+	link( jarc1, jarc2, newright, newleft );
+	left.addarc( newright  );
+	right.addarc( newleft  );
+    }
+
+    assert( jarc1->check( ) != 0 );
+    assert( jarc2->check( ) != 0 );
+    assert( jarc1->next->check( ) != 0);
+    assert( jarc2->next->check( ) != 0);
+}
+
+void
+Subdivider::check_t( Arc_ptr jarc1, Arc_ptr jarc2 )
+{
+    assert( jarc1->check( ) != 0 );
+    assert( jarc2->check( ) != 0 );
+    assert( jarc1->next->check( ) != 0 );
+    assert( jarc2->next->check( ) != 0 );
+    assert( jarc1 != jarc2 );
+
+    /* XXX - if these assertions fail, it is due to user error or
+	     undersampling */
+    if( ! ( jarc1->tail()[1] < (jarc1)->head()[1] ) ) {
+#ifndef NDEBUG
+	dprintf( "t difference %f\n",  jarc1->tail()[1] - (jarc1)->head()[1] );
+#endif
+	::mylongjmp( jumpbuffer, 28 );
+    }
+
+    if( ! ( jarc2->tail()[1] > (jarc2)->head()[1] ) ) { 
+#ifndef NDEBUG
+	dprintf( "t difference %f\n",  jarc2->tail()[1] - (jarc2)->head()[1] );
+#endif
+	::mylongjmp( jumpbuffer, 28 );
+    }
+}
+
+/*----------------------------------------------------------------------------
+ * join_t - add a pair of oppositely directed jordan arcs between two arcs
+ *----------------------------------------------------------------------------
+ */
+
+void
+Subdivider::join_t( Bin& bottom, Bin& top, Arc_ptr jarc1, Arc_ptr jarc2 )
+{
+    assert( jarc1->check( ) != 0 );
+    assert( jarc2->check( ) != 0 );
+    assert( jarc1->next->check( ) != 0 );
+    assert( jarc2->next->check( ) != 0 );
+    assert( jarc1 != jarc2 );
+
+    if( ! jarc1->getitail() )
+	jarc1 = jarc1->next;
+
+    if( ! jarc2->getitail() )
+	jarc2 = jarc2->next;
+
+    REAL s1 = jarc1->tail()[0];
+    REAL s2 = jarc2->tail()[0];
+    REAL t  = jarc1->tail()[1];
+
+    if( s1 == s2 ) {
+	simple_link( jarc1, jarc2 );
+    } else {
+	Arc_ptr newtop = new(arcpool) Arc( arc_top, 0 );
+	Arc_ptr newbot = new(arcpool) Arc( arc_bottom, 0 );
+	assert( s1 > s2 );
+	if( isBezierArcType() ) {
+	    arctessellator.bezier( newtop, s1, s2, t, t );
+	    arctessellator.bezier( newbot, s2, s1, t, t );
+	} else {
+	    arctessellator.pwl_top( newtop, t, s1, s2, stepsizes[1] );
+	    arctessellator.pwl_bottom( newbot, t, s2, s1, stepsizes[3] );
+	}
+	link( jarc1, jarc2, newtop, newbot );
+	bottom.addarc( newtop  );
+	top.addarc( newbot  );
+    }
+
+    assert( jarc1->check( ) != 0 );
+    assert( jarc2->check( ) != 0 );
+    assert( jarc1->next->check( ) != 0 );
+    assert( jarc2->next->check( ) != 0 );
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/subdivider.cc b/src/glu/sgi/libnurbs/internals/subdivider.cc
new file mode 100644
index 00000000000..cc0b5147065
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/subdivider.cc
@@ -0,0 +1,910 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * subdivider.cxx
+ *
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "subdivider.h"
+#include "arc.h"
+#include "bezierarc.h"
+#include "bin.h"
+#include "renderhints.h"
+#include "backend.h"
+#include "mapdesc.h"
+#include "quilt.h"
+#include "patchlist.h"
+#include "patch.h"
+#include "nurbsconsts.h"
+#include "trimvertpool.h"
+#include "simplemath.h"
+
+#include "polyUtil.h" //for function area()
+
+//#define  PARTITION_TEST
+#ifdef PARTITION_TEST
+#include "partitionY.h"
+#include "monoTriangulation.h"
+#include "dataTransform.h"
+#include "monoChain.h"
+
+#endif
+
+
+#define OPTIMIZE_UNTRIMED_CASE
+
+
+Bin*
+Subdivider::makePatchBoundary( const REAL *from, const REAL *to )
+{ 
+    Bin* ret = new Bin();
+    REAL smin = from[0];
+    REAL smax = to[0];
+    REAL tmin = from[1];
+    REAL tmax = to[1];
+
+    pjarc = 0;
+
+    Arc_ptr jarc = new(arcpool) Arc( arc_bottom, 0 );
+    arctessellator.bezier( jarc, smin, smax, tmin, tmin );
+    ret->addarc( jarc  );
+    pjarc = jarc->append( pjarc );
+
+    jarc = new(arcpool) Arc( arc_right, 0 );
+    arctessellator.bezier( jarc, smax, smax, tmin, tmax );
+    ret->addarc( jarc  );
+    pjarc = jarc->append( pjarc );
+
+    jarc = new(arcpool) Arc( arc_top, 0 );
+    arctessellator.bezier( jarc, smax, smin, tmax, tmax );
+    ret->addarc( jarc  );
+    pjarc = jarc->append( pjarc );
+
+    jarc = new(arcpool) Arc( arc_left, 0 );
+    arctessellator.bezier( jarc, smin, smin, tmax, tmin );
+    ret->addarc( jarc  );
+    jarc->append( pjarc );
+
+    assert( jarc->check() != 0 );
+    return ret;
+}
+
+/*---------------------------------------------------------------------------
+ * Subdivider - construct a subdivider
+ *---------------------------------------------------------------------------
+ */
+
+Subdivider::Subdivider( Renderhints& r, Backend& b ) 
+	: slicer( b ),
+	  arctessellator( trimvertexpool, pwlarcpool ), 
+	  arcpool( sizeof( Arc), 1, "arcpool" ),
+ 	  bezierarcpool( sizeof( BezierArc ), 1, "Bezarcpool" ),
+	  pwlarcpool( sizeof( PwlArc ), 1, "Pwlarcpool" ),
+	  renderhints( r ),
+	  backend( b )
+{
+}
+
+void
+Subdivider::setJumpbuffer( JumpBuffer *j )
+{
+    jumpbuffer = j;
+}
+
+/*---------------------------------------------------------------------------
+ * clear - reset all state after possible error condition
+ *---------------------------------------------------------------------------
+ */
+
+void		
+Subdivider::clear( void )
+{
+    trimvertexpool.clear();     
+    arcpool.clear();
+    pwlarcpool.clear();
+    bezierarcpool.clear();
+}
+
+/*---------------------------------------------------------------------------
+ * ~Subdivider - destroy a subdivider
+ *---------------------------------------------------------------------------
+ */
+
+Subdivider::~Subdivider( void )
+{
+}
+
+/*---------------------------------------------------------------------------
+ * addArc - add a bezier arc to a trim loop and to a bin
+ *---------------------------------------------------------------------------
+ */
+void
+Subdivider::addArc( REAL *cpts, Quilt *quilt, long _nuid )
+{
+    BezierArc *bezierArc = new(bezierarcpool) BezierArc;
+    Arc *jarc  		= new(arcpool) Arc( arc_none, _nuid );
+    jarc->pwlArc	= 0;
+    jarc->bezierArc	= bezierArc;
+    bezierArc->order	= quilt->qspec->order;
+    bezierArc->stride	= quilt->qspec->stride;
+    bezierArc->mapdesc	= quilt->mapdesc;
+    bezierArc->cpts	= cpts;
+    initialbin.addarc( jarc );
+    pjarc		= jarc->append( pjarc );
+}
+
+/*---------------------------------------------------------------------------
+ * addArc - add a pwl arc to a trim loop and to a bin
+ *---------------------------------------------------------------------------
+ */
+
+void
+Subdivider::addArc( int npts, TrimVertex *pts, long _nuid ) 
+{
+    Arc *jarc 		= new(arcpool) Arc( arc_none, _nuid );
+    jarc->pwlArc	= new(pwlarcpool) PwlArc( npts, pts );        
+    initialbin.addarc( jarc  );
+    pjarc		= jarc->append( pjarc );
+}
+
+void
+Subdivider::beginQuilts( void )
+{
+    qlist = 0;
+}
+
+void
+Subdivider::addQuilt( Quilt *quilt )
+{
+    quilt->next = qlist;
+    qlist = quilt;
+}
+
+/*---------------------------------------------------------------------------
+ * drawSurfaces - main entry point for surface tessellation
+ *---------------------------------------------------------------------------
+ */
+
+void
+Subdivider::drawSurfaces( long nuid )
+{
+    renderhints.init( );
+
+    if (qlist == NULL) 
+      {
+	//initialbin could be nonempty due to some errors
+	freejarcs(initialbin);
+	return;
+      }
+
+    for( Quilt *q = qlist; q; q = q->next ) {
+	if( q->isCulled( ) == CULL_TRIVIAL_REJECT ) {
+	    freejarcs( initialbin );
+	    return;
+	}
+    }
+
+
+    REAL from[2], to[2];
+    qlist->getRange( from, to, spbrkpts, tpbrkpts );
+#ifdef OPTIMIZE_UNTRIMED_CASE
+    //perform optimization only when the samplng method is 
+    //DOMAIN_DISTANCE and the display methdo is either 
+    //fill or outline_polygon.
+    int optimize = (is_domain_distance_sampling && (renderhints.display_method != N_OUTLINE_PATCH));
+#endif
+
+    if( ! initialbin.isnonempty() ) {
+#ifdef OPTIMIZE_UNTRIMED_CASE
+        if(! optimize )
+	  {	
+
+	  makeBorderTrim( from, to );
+	  }
+#else
+	makeBorderTrim( from, to );
+#endif
+    } else {
+	REAL rate[2];
+	qlist->findRates( spbrkpts, tpbrkpts, rate );
+
+    	if( decompose( initialbin, min(rate[0], rate[1]) ) ) 
+	    mylongjmp( jumpbuffer, 31 );
+    }
+
+    backend.bgnsurf( renderhints.wiretris, renderhints.wirequads, nuid );
+
+#ifdef PARTITION_TEST
+ if(    initialbin.isnonempty() && spbrkpts.end-2 == spbrkpts.start && 
+	tpbrkpts.end-2 == tpbrkpts.start)
+{
+    for(int i=spbrkpts.start; i<spbrkpts.end-1; i++){
+      for(int j=tpbrkpts.start; j<tpbrkpts.end-1; j++){
+	Real pta[2], ptb[2];
+	pta[0] = spbrkpts.pts[i];
+	ptb[0] = spbrkpts.pts[i+1];
+	pta[1] = tpbrkpts.pts[j];
+	ptb[1] = tpbrkpts.pts[j+1];
+	qlist->downloadAll(pta, ptb, backend);
+
+	directedLine *poly;
+
+	  {
+
+	    poly = bin_to_DLineLoops(initialbin);
+	    
+	    poly=poly->deleteDegenerateLinesAllPolygons();	    	
+
+    sampledLine* retSampledLines;
+//printf("before MC_partition\n");	    
+	    poly = MC_partitionY(poly, &retSampledLines);
+//printf("after MC_partition\n");	    
+
+	  }
+
+
+	{
+	  primStream pStream(5000,5000);
+	  directedLine* temp;
+
+	  for(temp=poly; temp != NULL; temp=temp->getNextPolygon())
+
+	    monoTriangulation(temp, &pStream);
+
+	  slicer.evalStream(&pStream);
+
+	}
+	//need to clean up space
+      }
+    }
+    freejarcs( initialbin );
+    backend.endsurf();
+    return;
+
+    /*
+    printf("num_polygons=%i\n", poly->numPolygons());
+    printf("num_edges=%i\n", poly->numEdgesAllPolygons());
+    poly->writeAllPolygons("zloutputFile");
+    return;
+    {
+      primStream pStream(20,20);
+      for(directedLine* tempD = poly; tempD != NULL; tempD = tempD->getNextPolygon())
+	monoTriangulation(tempD, &pStream);
+    }
+    return;
+    */
+}
+#endif //PARTITION_TEST
+
+
+#ifdef OPTIMIZE_UNTRIMED_CASE
+    if( (!initialbin.isnonempty())  && optimize )
+      {
+	int i,j;
+	int num_u_steps;
+        int num_v_steps;
+	for(i=spbrkpts.start; i<spbrkpts.end-1; i++){
+	  for(j=tpbrkpts.start; j<tpbrkpts.end-1; j++){
+	    Real pta[2], ptb[2];
+	    pta[0] = spbrkpts.pts[i];
+	    ptb[0] = spbrkpts.pts[i+1];
+	    pta[1] = tpbrkpts.pts[j];
+	    ptb[1] = tpbrkpts.pts[j+1];
+	    qlist->downloadAll(pta, ptb, backend);
+	   
+            num_u_steps = (int) (domain_distance_u_rate * (ptb[0]-pta[0]));
+            num_v_steps = (int) (domain_distance_v_rate * (ptb[1]-pta[1]));
+
+            if(num_u_steps <= 0) num_u_steps = 1;
+            if(num_v_steps <= 0) num_v_steps = 1;
+
+	    backend.surfgrid(pta[0], ptb[0], num_u_steps, 
+			     ptb[1], pta[1], num_v_steps);
+	    backend.surfmesh(0,0,num_u_steps,num_v_steps);
+
+        
+
+	    continue;
+	    /* the following is left for reference purpose, don't delete
+	    {
+	    Bin* tempSource;	
+	      Patchlist patchlist(qlist, pta, ptb);
+	      patchlist.getstepsize();
+
+	      tempSource=makePatchBoundary(pta, ptb);
+
+	      tessellation(*tempSource, patchlist);
+
+	      render(*tempSource);
+	      delete tempSource;
+	    }
+	    */
+	  }
+	}
+      }
+    else
+      subdivideInS( initialbin );
+#else
+
+    subdivideInS( initialbin );
+#endif
+
+    backend.endsurf();
+
+}
+
+void
+Subdivider::subdivideInS( Bin& source )
+{
+    if( renderhints.display_method == N_OUTLINE_PARAM ) {
+	outline( source );
+	freejarcs( source );
+    } else {
+	setArcTypeBezier();
+	setNonDegenerate();
+	splitInS( source, spbrkpts.start, spbrkpts.end );
+    }
+}
+
+
+/*---------------------------------------------------------------------------
+ * splitInS - split a patch and a bin by an isoparametric line
+ *---------------------------------------------------------------------------
+ */
+
+void
+Subdivider::splitInS( Bin& source, int start, int end )
+{
+    if( source.isnonempty() ) {
+        if( start != end ) {
+	    int	i = start + (end - start) / 2;
+	    Bin left, right;
+	    split( source, left, right, 0, spbrkpts.pts[i] );
+	    splitInS( left, start, i );
+	    splitInS( right, i+1, end );
+        } else {
+	    if( start == spbrkpts.start || start == spbrkpts.end ) {
+		freejarcs( source );
+	    } else if( renderhints.display_method == N_OUTLINE_PARAM_S ) {
+		outline( source );
+		freejarcs( source );
+	    } else {
+		setArcTypeBezier();
+		setNonDegenerate();
+		s_index = start;
+		splitInT( source, tpbrkpts.start, tpbrkpts.end );
+	    }
+        }
+    } 
+}
+
+/*---------------------------------------------------------------------------
+ * splitInT - split a patch and a bin by an isoparametric line
+ *---------------------------------------------------------------------------
+ */
+
+void
+Subdivider::splitInT( Bin& source, int start, int end )
+{
+    if( source.isnonempty() ) {
+        if( start != end ) {
+	    int	i = start + (end - start) / 2;
+	    Bin left, right;
+	    split( source, left, right, 1, tpbrkpts.pts[i] );
+	    splitInT( left, start, i );
+	    splitInT( right, i+1, end );
+        } else {
+	    if( start == tpbrkpts.start || start == tpbrkpts.end ) {
+		freejarcs( source );
+	    } else if( renderhints.display_method == N_OUTLINE_PARAM_ST ) {
+		outline( source );
+		freejarcs( source );
+	    } else {
+		t_index = start;
+		setArcTypeBezier();
+		setDegenerate();
+
+		REAL pta[2], ptb[2];
+		pta[0] = spbrkpts.pts[s_index-1];
+		pta[1] = tpbrkpts.pts[t_index-1];
+
+		ptb[0] = spbrkpts.pts[s_index];
+		ptb[1] = tpbrkpts.pts[t_index];
+		qlist->downloadAll( pta, ptb, backend );
+	    
+		Patchlist patchlist( qlist, pta, ptb );
+/*
+printf("-------samplingSplit-----\n");
+source.show("samplingSplit source");
+*/
+		samplingSplit( source, patchlist, renderhints.maxsubdivisions, 0 );
+		setNonDegenerate();
+		setArcTypeBezier();
+	    }
+        }
+    } 
+}
+
+/*--------------------------------------------------------------------------
+ * samplingSplit - recursively subdivide patch, cull check each subpatch  
+ *--------------------------------------------------------------------------
+ */
+
+void
+Subdivider::samplingSplit( 
+    Bin& source, 
+    Patchlist& patchlist, 
+    int subdivisions, 
+    int param )
+{
+    if( ! source.isnonempty() ) return;
+
+    if( patchlist.cullCheck() == CULL_TRIVIAL_REJECT ) {
+	freejarcs( source );
+	return;
+    }
+
+    patchlist.getstepsize();
+
+    if( renderhints.display_method == N_OUTLINE_PATCH ) {
+        tessellation( source, patchlist );
+	outline( source );
+	freejarcs( source );
+	return;
+    } 
+
+    //patchlist.clamp();
+
+    tessellation( source, patchlist );
+
+    if( patchlist.needsSamplingSubdivision() && (subdivisions > 0) ) {
+	if( ! patchlist.needsSubdivision( 0 ) )
+	    param = 1;
+	else if( ! patchlist.needsSubdivision( 1 ) )
+	    param = 0;
+	else
+	    param = 1 - param;
+
+	Bin left, right;
+	REAL mid = ( patchlist.pspec[param].range[0] +
+		     patchlist.pspec[param].range[1] ) * 0.5;
+	split( source, left, right, param, mid );
+	Patchlist subpatchlist( patchlist, param, mid );
+	samplingSplit( left, subpatchlist, subdivisions-1, param );
+	samplingSplit( right, patchlist, subdivisions-1, param );
+    } else {
+	setArcTypePwl();
+	setDegenerate();
+	nonSamplingSplit( source, patchlist, subdivisions, param );
+	setDegenerate();
+	setArcTypeBezier();
+    }
+}
+
+void
+Subdivider::nonSamplingSplit( 
+    Bin& source, 
+    Patchlist& patchlist, 
+    int subdivisions, 
+    int param )
+{
+    if( patchlist.needsNonSamplingSubdivision() && (subdivisions > 0) ) {
+	param = 1 - param;
+
+	Bin left, right;
+	REAL mid = ( patchlist.pspec[param].range[0] +
+		     patchlist.pspec[param].range[1] ) * 0.5;
+	split( source, left, right, param, mid );
+	Patchlist subpatchlist( patchlist, param, mid );
+	if( left.isnonempty() )
+	    if( subpatchlist.cullCheck() == CULL_TRIVIAL_REJECT ) 
+		freejarcs( left );
+	    else
+	        nonSamplingSplit( left, subpatchlist, subdivisions-1, param );
+	if( right.isnonempty() ) 
+	    if( patchlist.cullCheck() == CULL_TRIVIAL_REJECT ) 
+		freejarcs( right );
+	    else
+	        nonSamplingSplit( right, patchlist, subdivisions-1, param );
+
+    } else {
+	// make bbox calls
+	patchlist.bbox();
+	backend.patch( patchlist.pspec[0].range[0], patchlist.pspec[0].range[1],
+		       patchlist.pspec[1].range[0], patchlist.pspec[1].range[1] );
+    
+	if( renderhints.display_method == N_OUTLINE_SUBDIV ) {
+	    outline( source );
+	    freejarcs( source );
+	} else {
+	    setArcTypePwl();
+	    setDegenerate();
+	    findIrregularS( source );
+	    monosplitInS( source, smbrkpts.start, smbrkpts.end );
+	}
+    }
+}
+
+/*--------------------------------------------------------------------------
+ * tessellation - set tessellation of interior and boundary of patch
+ *--------------------------------------------------------------------------
+ */
+
+void
+Subdivider::tessellation( Bin& bin, Patchlist &patchlist )
+{
+    // tessellate unsampled trim curves
+    tessellate( bin, patchlist.pspec[1].sidestep[1], patchlist.pspec[0].sidestep[1],
+	 patchlist.pspec[1].sidestep[0], patchlist.pspec[0].sidestep[0] );
+
+    // set interior sampling rates
+    slicer.setstriptessellation( patchlist.pspec[0].stepsize, patchlist.pspec[1].stepsize );
+
+    //added by zl: set the order which will be used in slicer.c++
+    slicer.set_ulinear( (patchlist.get_uorder() == 2));
+    slicer.set_vlinear( (patchlist.get_vorder() == 2));
+
+    // set boundary sampling rates
+    stepsizes[0] = patchlist.pspec[1].stepsize;
+    stepsizes[1] = patchlist.pspec[0].stepsize;
+    stepsizes[2] = patchlist.pspec[1].stepsize;
+    stepsizes[3] = patchlist.pspec[0].stepsize;
+}
+
+/*---------------------------------------------------------------------------
+ * monosplitInS - split a patch and a bin by an isoparametric line
+ *---------------------------------------------------------------------------
+ */
+
+void
+Subdivider::monosplitInS( Bin& source, int start, int end )
+{
+    if( source.isnonempty() ) {
+        if( start != end ) {
+	    int	i = start + (end - start) / 2;
+	    Bin left, right;
+	    split( source, left, right, 0, smbrkpts.pts[i] );
+	    monosplitInS( left, start, i );
+	    monosplitInS( right, i+1, end );
+        } else {
+	    if( renderhints.display_method == N_OUTLINE_SUBDIV_S ) {
+		outline( source );
+		freejarcs( source );
+	    } else {
+		setArcTypePwl();
+		setDegenerate();
+		findIrregularT( source );
+		monosplitInT( source, tmbrkpts.start, tmbrkpts.end );
+	    }
+        }
+    } 
+}
+
+/*---------------------------------------------------------------------------
+ * monosplitInT - split a patch and a bin by an isoparametric line
+ *---------------------------------------------------------------------------
+ */
+
+void
+Subdivider::monosplitInT( Bin& source, int start, int end )
+{
+    if( source.isnonempty() ) {
+        if( start != end ) {
+	    int	i = start + (end - start) / 2;
+	    Bin left, right;
+	    split( source, left, right, 1, tmbrkpts.pts[i] );
+	    monosplitInT( left, start, i );
+	    monosplitInT( right, i+1, end );
+        } else {
+	    if( renderhints.display_method == N_OUTLINE_SUBDIV_ST ) {
+		outline( source );
+		freejarcs( source );
+	    } else {
+/*
+printf("*******render\n");
+source.show("source\n");
+*/
+		render( source );
+		freejarcs( source );
+	    }
+        }
+    } 
+}
+
+
+/*----------------------------------------------------------------------------
+ * findIrregularS - determine points of non-monotonicity is s direction
+ *----------------------------------------------------------------------------
+ */
+
+void
+Subdivider::findIrregularS( Bin& bin )
+{
+    assert( bin.firstarc()->check() != 0 );
+
+    smbrkpts.grow( bin.numarcs() );
+
+    for( Arc_ptr jarc=bin.firstarc(); jarc; jarc=bin.nextarc() ) {
+	REAL *a = jarc->prev->tail();
+	REAL *b = jarc->tail();
+	REAL *c = jarc->head();
+
+	if( b[1] == a[1] && b[1] == c[1] ) continue;
+
+	//corrected code
+	if((b[1]<=a[1] && b[1] <= c[1]) ||
+	   (b[1]>=a[1] && b[1] >= c[1]))
+	  {
+	    //each arc (jarc, jarc->prev, jarc->next) is a 
+	    //monotone arc consisting of multiple line segements.
+	    //it may happen that jarc->prev and jarc->next are the same,
+	    //that is, jarc->prev and jarc form a closed loop.
+	    //In such case, a and c will be the same.
+            if(a[0]==c[0] && a[1] == c[1])
+	      {
+		if(jarc->pwlArc->npts >2)
+		  {
+		    c = jarc->pwlArc->pts[jarc->pwlArc->npts-2].param;
+		  }
+		else
+		  {
+		    assert(jarc->prev->pwlArc->npts>2);
+		    a = jarc->prev->pwlArc->pts[jarc->prev->pwlArc->npts-2].param;
+		  }
+		    
+	      }
+	    if(area(a,b,c) < 0)
+	      {
+		smbrkpts.add(b[0]);
+	      }
+
+	  }
+
+	/* old code, 
+	if( b[1] <= a[1] && b[1] <= c[1] ) {
+	    if( ! ccwTurn_tr( jarc->prev, jarc ) )
+                smbrkpts.add( b[0] );
+	} else if( b[1] >= a[1] && b[1] >= c[1] ) {
+	    if( ! ccwTurn_tl( jarc->prev, jarc ) )
+                smbrkpts.add( b[0] );
+        }
+	*/
+
+    }
+
+    smbrkpts.filter();
+} 
+
+/*----------------------------------------------------------------------------
+ * findIrregularT - determine points of non-monotonicity in t direction
+ *		     where one arc is parallel to the s axis.
+ *----------------------------------------------------------------------------
+ */
+
+void
+Subdivider::findIrregularT( Bin& bin )
+{
+    assert( bin.firstarc()->check() != 0 );
+
+    tmbrkpts.grow( bin.numarcs() );
+
+    for( Arc_ptr jarc=bin.firstarc(); jarc; jarc=bin.nextarc() ) {
+	REAL *a = jarc->prev->tail();
+	REAL *b = jarc->tail();
+	REAL *c = jarc->head();
+
+	if( b[0] == a[0] && b[0] == c[0] ) continue;
+
+	if( b[0] <= a[0] && b[0] <= c[0] ) {
+	    if( a[1] != b[1] && b[1] != c[1] ) continue; 
+	    if( ! ccwTurn_sr( jarc->prev, jarc ) )
+                tmbrkpts.add( b[1] );
+	} else if ( b[0] >= a[0] && b[0] >= c[0] ) {
+	    if( a[1] != b[1] && b[1] != c[1] ) continue; 
+	    if( ! ccwTurn_sl( jarc->prev, jarc ) )
+                tmbrkpts.add( b[1] );
+	}
+    }
+    tmbrkpts.filter( );
+}
+
+/*-----------------------------------------------------------------------------
+ * makeBorderTrim - if no user input trimming data then create 
+ * a trimming curve around the boundaries of the Quilt.  The curve consists of
+ * four Jordan arcs, one for each side of the Quilt, connected, of course,
+ * head to tail. 
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Subdivider::makeBorderTrim( const REAL *from, const REAL *to )
+{ 
+    REAL smin = from[0];
+    REAL smax = to[0];
+    REAL tmin = from[1];
+    REAL tmax = to[1];
+
+    pjarc = 0;
+
+    Arc_ptr jarc = new(arcpool) Arc( arc_bottom, 0 );
+    arctessellator.bezier( jarc, smin, smax, tmin, tmin );
+    initialbin.addarc( jarc  );
+    pjarc = jarc->append( pjarc );
+
+    jarc = new(arcpool) Arc( arc_right, 0 );
+    arctessellator.bezier( jarc, smax, smax, tmin, tmax );
+    initialbin.addarc( jarc  );
+    pjarc = jarc->append( pjarc );
+
+    jarc = new(arcpool) Arc( arc_top, 0 );
+    arctessellator.bezier( jarc, smax, smin, tmax, tmax );
+    initialbin.addarc( jarc  );
+    pjarc = jarc->append( pjarc );
+
+    jarc = new(arcpool) Arc( arc_left, 0 );
+    arctessellator.bezier( jarc, smin, smin, tmax, tmin );
+    initialbin.addarc( jarc  );
+    jarc->append( pjarc );
+
+    assert( jarc->check() != 0 );
+}
+
+/*----------------------------------------------------------------------------
+ * render - renders all monotone regions in a bin and frees the bin
+ *----------------------------------------------------------------------------
+ */
+
+void
+Subdivider::render( Bin& bin )
+{
+    bin.markall();
+
+#ifdef N_ISOLINE_S
+    slicer.setisolines( ( renderhints.display_method == N_ISOLINE_S ) ? 1 : 0 );
+#else
+    slicer.setisolines( 0 );
+#endif
+
+    for( Arc_ptr jarc=bin.firstarc(); jarc; jarc=bin.nextarc() ) {
+	if( jarc->ismarked() ) {
+	    assert( jarc->check( ) != 0 );
+	    Arc_ptr jarchead = jarc;
+	    do {
+		jarc->clearmark();
+		jarc = jarc->next;
+	    } while (jarc != jarchead);
+	    slicer.slice( jarc );
+	}
+    }
+}
+
+/*---------------------------------------------------------------------------
+ * outline - render the trimmed patch by outlining the boundary 
+ *---------------------------------------------------------------------------
+ */
+
+void
+Subdivider::outline( Bin& bin )
+{
+    bin.markall();
+    for( Arc_ptr jarc=bin.firstarc(); jarc; jarc=bin.nextarc() ) {
+	if( jarc->ismarked() ) {
+	    assert( jarc->check( ) != 0 );
+	    Arc_ptr jarchead = jarc;
+	    do {
+		slicer.outline( jarc );
+		jarc->clearmark();
+		jarc = jarc->prev;
+	    } while (jarc != jarchead);
+	}
+    }
+}
+
+/*---------------------------------------------------------------------------
+ * freejarcs - free all arcs in a bin
+ *---------------------------------------------------------------------------
+ */
+
+void
+Subdivider::freejarcs( Bin& bin )
+{
+    bin.adopt();	/* XXX - should not be necessary */
+
+    Arc_ptr jarc;
+    while( (jarc = bin.removearc()) != NULL ) {
+	if( jarc->pwlArc ) jarc->pwlArc->deleteMe( pwlarcpool ); jarc->pwlArc = 0;
+	if( jarc->bezierArc) jarc->bezierArc->deleteMe( bezierarcpool ); jarc->bezierArc = 0;
+	jarc->deleteMe( arcpool );
+    }
+}
+
+/*----------------------------------------------------------------------------
+ * tessellate - tessellate all Bezier arcs in a bin
+ * 		   1) only accepts linear Bezier arcs as input 
+ * 		   2) the Bezier arcs are stored in the pwlArc structure
+ * 		   3) only vertical or horizontal lines work
+ * 		-- should 
+ * 		   1) represent Bezier arcs in BezierArc structure
+ * 		      (this requires a multitude of changes to the code)
+ * 		   2) accept high degree Bezier arcs (hard)
+ * 		   3) map the curve onto the surface to determine tessellation
+ * 		   4) work for curves of arbitrary geometry
+ *----------------------------------------------------------------------------
+ */
+
+
+void
+Subdivider::tessellate( Bin& bin, REAL rrate, REAL trate, REAL lrate, REAL brate )
+{
+    for( Arc_ptr jarc=bin.firstarc(); jarc; jarc=bin.nextarc() ) {
+	if( jarc->isbezier( ) ) {
+    	    assert( jarc->pwlArc->npts == 2 );	
+	    TrimVertex  *pts = jarc->pwlArc->pts;
+    	    REAL s1 = pts[0].param[0];
+    	    REAL t1 = pts[0].param[1];
+    	    REAL s2 = pts[1].param[0];
+    	    REAL t2 = pts[1].param[1];
+	    
+    	    jarc->pwlArc->deleteMe( pwlarcpool ); jarc->pwlArc = 0;
+	    
+	    switch( jarc->getside() ) {
+		case arc_left:
+		    assert( s1 == s2 );
+		    arctessellator.pwl_left( jarc, s1, t1, t2, lrate );
+		    break;
+		case arc_right:
+		    assert( s1 == s2 );
+		    arctessellator.pwl_right( jarc, s1, t1, t2, rrate );
+		    break;
+		case arc_top:
+		    assert( t1 == t2 );
+		    arctessellator.pwl_top( jarc, t1, s1, s2, trate );
+		    break;
+		case arc_bottom:
+		    assert( t1 == t2 );
+		    arctessellator.pwl_bottom( jarc, t1, s1, s2, brate );
+		    break;
+		case arc_none:
+		    (void) abort();
+		    break;
+	    }
+	    assert( ! jarc->isbezier() );
+    	    assert( jarc->check() != 0 );
+	}
+    }
+}
diff --git a/src/glu/sgi/libnurbs/internals/subdivider.h b/src/glu/sgi/libnurbs/internals/subdivider.h
new file mode 100644
index 00000000000..d190af03f59
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/subdivider.h
@@ -0,0 +1,206 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * subdivider.h
+ *
+ * $Date: 2001/08/07 17:34:11 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/subdivider.h,v 1.2 2001/08/07 17:34:11 brianp Exp $
+ */
+
+#ifndef __glusubdivider_h_
+#define __glusubdivider_h_
+
+#include "mysetjmp.h"
+#include "bin.h"
+#include "flist.h"
+#include "slicer.h"
+#include "arctess.h"
+#include "trimvertex.h"
+#include "trimvertpool.h"
+
+class Arc;
+class Pool;
+class Renderhints;
+class Quilt;
+class Patchlist;
+class Curvelist;
+struct JumpBuffer;
+
+class Subdivider {
+public:
+			Subdivider( Renderhints&, Backend& );
+			~Subdivider( void );
+    void		clear( void );
+
+    void		beginTrims( void ) {}
+    void		beginLoop( void );
+    void		addArc( REAL *, Quilt *, long );
+    void		addArc( int, TrimVertex *, long );
+    void		endLoop( void ) {}
+    void		endTrims( void ) {}
+
+    void		beginQuilts( void );
+    void		addQuilt( Quilt * );
+    void		endQuilts( void ) {}
+
+    void		drawCurves( void );
+    void		drawSurfaces( long );
+
+    int			ccwTurn_sl( Arc_ptr, Arc_ptr  );
+    int			ccwTurn_sr( Arc_ptr , Arc_ptr   );
+    int			ccwTurn_tl( Arc_ptr , Arc_ptr  );
+    int			ccwTurn_tr( Arc_ptr , Arc_ptr  );
+
+    void		setJumpbuffer( JumpBuffer * );
+
+    void set_domain_distance_u_rate(REAL u_rate)
+      {
+	domain_distance_u_rate = u_rate;
+      }
+    void set_domain_distance_v_rate(REAL v_rate)
+      {
+	domain_distance_v_rate = v_rate;
+      }
+    void set_is_domain_distance_sampling(int flag)
+      {
+	is_domain_distance_sampling = flag;
+      }
+
+private:
+    void		classify_headonleft_s( Bin &, Bin &, Bin &, REAL );
+    void		classify_tailonleft_s( Bin &, Bin &, Bin &, REAL );
+    void		classify_headonright_s( Bin &, Bin &, Bin &, REAL );
+    void		classify_tailonright_s( Bin &, Bin &, Bin &, REAL );
+    void		classify_headonleft_t( Bin &, Bin &, Bin &, REAL );
+    void		classify_tailonleft_t( Bin &, Bin &, Bin &, REAL );
+    void		classify_headonright_t( Bin &, Bin &, Bin &, REAL );
+    void		classify_tailonright_t( Bin &, Bin &, Bin &, REAL );
+
+    enum dir 		{ down, same, up, none };
+    void		tessellate( Arc_ptr, REAL );
+    void		monotonize( Arc_ptr , Bin & );
+    int			isMonotone( Arc_ptr  );
+    int			decompose( Bin &, REAL );
+
+
+    Slicer		slicer;
+    ArcTessellator	arctessellator;
+    Pool		arcpool;
+    Pool		bezierarcpool;
+    Pool		pwlarcpool;
+    TrimVertexPool	trimvertexpool;
+
+    JumpBuffer*		jumpbuffer;
+    Renderhints&	renderhints;
+    Backend&		backend;
+
+    Bin			initialbin;
+    Arc_ptr		pjarc;
+    int 		s_index;
+    int			t_index;
+    Quilt *		qlist;
+    Flist		spbrkpts;
+    Flist		tpbrkpts;
+    Flist		smbrkpts;
+    Flist		tmbrkpts;
+    REAL	 	stepsizes[4];
+    int			showDegenerate;
+    int			isArcTypeBezier;
+
+    void		samplingSplit( Curvelist&, int );
+
+    void		subdivideInS( Bin&  );
+    void		splitInS( Bin&, int, int );
+    void		splitInT( Bin&, int, int );
+    void		samplingSplit( Bin&, Patchlist&, int, int );
+    void		nonSamplingSplit( Bin&, Patchlist&, int, int );
+    void		tessellation( Bin&, Patchlist& );
+    void		monosplitInS( Bin&, int, int );
+    void		monosplitInT( Bin&, int, int );
+
+    void		outline( Bin & );
+    void		freejarcs( Bin & );
+    void		render( Bin & );
+    void		split( Bin &, Bin &, Bin &, int, REAL );
+    void		tessellate( Bin &, REAL, REAL, REAL, REAL );
+
+    inline void		setDegenerate( void ) { showDegenerate = 1; }
+    inline void		setNonDegenerate( void ) { showDegenerate = 0; }
+    inline int		showingDegenerate( void ) { return showDegenerate; }
+    inline void		setArcTypeBezier( void ) { isArcTypeBezier = 1; }
+    inline void		setArcTypePwl( void ) { isArcTypeBezier = 0; }
+    inline int		isBezierArcType( void ) { return isArcTypeBezier; }
+
+    void		makeBorderTrim( const REAL *, const REAL * );
+    void		split( Bin &, int, const REAL *, int, int );
+    void		partition( Bin &, Bin &, Bin &, Bin &, Bin &, int, REAL );
+    void		findIrregularS( Bin & );
+    void		findIrregularT( Bin & );
+
+
+    inline int		bbox( TrimVertex *, TrimVertex *, TrimVertex *, int );
+    static int		bbox( REAL, REAL, REAL, REAL, REAL, REAL );
+    static int		ccw( TrimVertex *, TrimVertex *, TrimVertex * );
+    void		join_s( Bin &, Bin &, Arc_ptr, Arc_ptr  );
+    void		join_t( Bin &, Bin &, Arc_ptr , Arc_ptr  );
+    int			arc_split( Arc_ptr , int, REAL, int );
+    void		check_s( Arc_ptr , Arc_ptr  );
+    void		check_t( Arc_ptr , Arc_ptr  );
+    inline void		link( Arc_ptr , Arc_ptr , Arc_ptr , Arc_ptr  );
+    inline void		simple_link( Arc_ptr , Arc_ptr  );
+
+   Bin*                 makePatchBoundary( const REAL *from, const REAL *to );
+
+   /*in domain distance method, the tessellation is controled by two numbers:
+    *GLU_U_STEP: number of u-segments per unit u length of domain
+    *GLU_V_STEP: number of v-segments per unit v length of domain
+    *These two numbers are normally stored in mapdesc->maxs(t)rate.
+    *I (ZL) put these two numbers here so that I can optimize the untrimmed 
+    *case in the case of domain distance sampling.
+    *These two numbers are set by set_domain_distance_u_rate() and ..._v_..().
+    */
+   REAL domain_distance_u_rate;
+   REAL domain_distance_v_rate;
+   int is_domain_distance_sampling;
+};
+
+inline void
+Subdivider::beginLoop( void ) 
+{
+    pjarc = 0;
+}
+
+
+#endif /* __glusubdivider_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/tobezier.cc b/src/glu/sgi/libnurbs/internals/tobezier.cc
new file mode 100644
index 00000000000..6b4229da553
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/tobezier.cc
@@ -0,0 +1,689 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/* 
+ * tobezier.c++
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/tobezier.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "mystring.h"
+#include "quilt.h"
+#include "knotvector.h"
+
+/* local type definitions */
+struct Breakpt {		/* breakpoints	*/
+    Knot		value;		/* value	*/
+    int			multi;		/* multiplicity	*/
+    int			def;		/* deficit */
+};
+
+struct Knotspec {		/* knotvector format */
+    long		order;		/* order of spline  */
+    Knot_ptr		inkbegin;	/* input knot sequence */
+    Knot_ptr		inkend;		/* location after last knot */
+    Knot_ptr		outkbegin;	/* in-process knot subsequence */
+    Knot_ptr		outkend;	/* location after last knot */
+    Knot_ptr		kleft;		/* */
+    Knot_ptr		kright;		/* */
+    Knot_ptr		kfirst;		/* */
+    Knot_ptr		klast;		/* */
+    Knot_ptr		sbegin;		/* conversion factor values */
+    Breakpt *		bbegin;		/* in-process breakpoints */
+    Breakpt *		bend;		/* last breakpoint */
+    int			ncoords;	/* coordinates per control point */
+    int			prestride;	/* stride between input points */
+    int			poststride;	/* stride between output points	*/
+    int 		preoffset;	/* scaled point offset	*/
+    int 		postoffset;	/* scaled point offset	*/
+    int 		prewidth;	/* width of dimension	*/
+    int 		postwidth;	/* width of dimension	*/
+    int 		istransformed;	/* was dimension transformed */
+    Knotspec *		next;   	/* next knotspec */
+    Knotspec *		kspectotrans;   /* knotspec in transformation direction */
+
+			Knotspec( void );
+			~Knotspec( void );
+    void		factors( void );
+    void		insert( REAL * );
+    void		preselect();
+    void		select( void );
+    void		copy( INREAL *, REAL * );
+    void		breakpoints( void );
+    void		knots( void );
+    void		transform( REAL * );
+    void		showpts( REAL * );
+    
+    void		pt_io_copy( REAL *, INREAL * );
+    void		pt_oo_copy( REAL *, REAL * );
+    void		pt_oo_sum( REAL*, REAL*, REAL*, Knot, Knot );
+};
+
+struct Splinespec {		/* a non-uniform tensor element */
+			Splinespec( int );
+                        ~Splinespec(void);
+    Knotspec		*kspec;	/* format of each param. dir. */
+    int			dim;		/* domain dimension */
+    REAL *		outcpts;	/* Bezier control points */
+
+    void		kspecinit( Knotvector & );
+    void		kspecinit( Knotvector &, Knotvector & );
+    void		select( void );
+    void		layout( long );
+    void		setupquilt( Quilt_ptr );
+    void		copy( INREAL * );
+    void		transform( void );
+};
+
+/*-----------------------------------------------------------------------------
+ * Quilt::toBezier - convert from NURBS to rational Bezier 
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Quilt::toBezier( 
+    Knotvector& knotvector,	/* a knot vector */
+    INREAL *ctlpts,		/* input contol points */
+    long ncoords )		/* number of coordinates per control point */
+{
+    Splinespec spline( 1 );
+    spline.kspecinit( knotvector );
+    spline.select();
+    spline.layout( ncoords );
+    spline.setupquilt( this );
+    spline.copy( ctlpts );
+    spline.transform();
+}
+
+void
+Quilt::toBezier( 
+    Knotvector& sknotvector,	/* a knot vector */
+    Knotvector& tknotvector,	/* a knot vector */
+    INREAL *ctlpts,		/* input contol points */
+    long ncoords )		/* number of coordinates per control point */
+{
+    Splinespec spline( 2 );
+    spline.kspecinit( sknotvector, tknotvector );
+    spline.select();
+    spline.layout( ncoords );
+    spline.setupquilt( this );
+    spline.copy( ctlpts );
+    spline.transform();
+}
+Splinespec::Splinespec( int dimen )
+{
+    dim = dimen;
+}
+
+Splinespec::~Splinespec( void )
+{
+    /* Note: do NOT delete 'outcpts' here since its address (not contents)
+     * is copied in 'cpts' in this file in function Splinespec::setupquilt().
+     * This block of memory will eventually be deleted in file quilt.c++ in
+     * function Quilt::deleteMe() through 'cpts' so do NOT delete it here!
+     */	
+    Knotspec *ktrav= kspec;         //start at beginning of list 
+    while (ktrav != 0) {            //any items to delete? 
+       Knotspec *deleteThis= ktrav; //remember to delete this 
+       ktrav= ktrav->next;          //go to next item if any
+       delete deleteThis;           //delete it
+    }	
+} /* ~Splinespec() */
+
+/*-----------------------------------------------------------------------------
+ * Splinespec::kspecinit - initialize Splinespec structure
+ *
+ * Client: Quilt::toBezier
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Splinespec::kspecinit( Knotvector& knotvector )
+{
+    kspec = new Knotspec;
+    kspec->inkbegin = knotvector.knotlist;
+    kspec->inkend = knotvector.knotlist + knotvector.knotcount;
+    kspec->prestride = (int) knotvector.stride; 
+    kspec->order = knotvector.order;
+    kspec->next = NULL;
+}
+
+void
+Splinespec::kspecinit( Knotvector& sknotvector, Knotvector& tknotvector )
+{
+    kspec = new Knotspec;
+    Knotspec *tkspec = new Knotspec;
+
+    kspec->inkbegin = sknotvector.knotlist;
+    kspec->inkend = sknotvector.knotlist + sknotvector.knotcount;
+    kspec->prestride = (int) sknotvector.stride; 
+    kspec->order = sknotvector.order;
+    kspec->next = tkspec;
+
+    tkspec->inkbegin = tknotvector.knotlist;
+    tkspec->inkend = tknotvector.knotlist + tknotvector.knotcount;
+    tkspec->prestride = (int) tknotvector.stride; 
+    tkspec->order = tknotvector.order;
+    tkspec->next = NULL;
+}
+
+
+/*-----------------------------------------------------------------------------
+ * Splinespec::select - select the subsegments to copy
+ *
+ * Client: gl_quilt_to_bezier	
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Splinespec::select( )
+{
+    for( Knotspec *knotspec = kspec; knotspec; knotspec = knotspec->next ) {
+	knotspec->preselect();
+	knotspec->select();
+    }
+}
+
+/*-----------------------------------------------------------------------------
+ * Splinespec::layout - 
+ *
+ * Client: gl_quilt_to_bezier	
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Splinespec::layout( long ncoords )
+{
+
+    long stride = ncoords;
+    for( Knotspec *knotspec = kspec; knotspec; knotspec=knotspec->next ) {
+	knotspec->poststride = (int) stride;
+	stride *= ((knotspec->bend-knotspec->bbegin)*knotspec->order + knotspec->postoffset);
+        knotspec->preoffset  *= knotspec->prestride;
+	knotspec->prewidth  *= knotspec->poststride;
+	knotspec->postwidth *= knotspec->poststride;
+	knotspec->postoffset *= knotspec->poststride;
+        knotspec->ncoords = (int) ncoords;
+    }
+    outcpts = new REAL[stride];
+    assert( outcpts != 0 );  
+}
+
+/*-----------------------------------------------------------------------------
+ * Splinespec::copy - copy the control points of current subobject
+ *
+ * Client: gl_quilt_to_bezier
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Splinespec::copy( INREAL *incpts )
+{
+    kspec->copy( incpts, outcpts );
+}
+
+/*-----------------------------------------------------------------------------
+ * Splinespec::setupquilt - assign all quilt variables from knotspec 
+ *
+ * Client: gl_quilt_to_bezier
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Splinespec::setupquilt( Quilt_ptr quilt )
+{
+    Quiltspec_ptr qspec = quilt->qspec;
+    quilt->eqspec = qspec + dim;
+    for( Knotspec *knotspec = kspec; knotspec; knotspec=knotspec->next, qspec++ ) {
+	qspec->stride	= knotspec->poststride;
+	qspec->width	= knotspec->bend - knotspec->bbegin;
+	qspec->order	= (int) knotspec->order;
+	qspec->offset	= knotspec->postoffset;
+	qspec->index	= 0;
+	qspec->bdry[0]	= (knotspec->kleft == knotspec->kfirst) ? 1 : 0;
+	qspec->bdry[1]	= (knotspec->kright == knotspec->klast) ? 1 : 0;
+	qspec->breakpoints = new Knot[qspec->width+1];
+	Knot_ptr k =  qspec->breakpoints;
+	for( Breakpt *bk = knotspec->bbegin; bk <= knotspec->bend; bk++ )
+	    *(k++) = bk->value;
+    }
+    quilt->cpts = outcpts;
+    quilt->next = 0;
+}
+
+/*-----------------------------------------------------------------------------
+ * Splinespec::transform - convert a spline to Bezier format
+ *
+ * Client: gl_quilt_to_bezier
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Splinespec::transform( void )
+{
+    Knotspec *knotspec;
+    for( knotspec = kspec; knotspec; knotspec=knotspec->next )
+        knotspec->istransformed = 0;
+
+    for( knotspec = kspec; knotspec; knotspec=knotspec->next ) {
+	for( Knotspec *kspec2 = kspec; kspec2; kspec2=kspec2->next )
+	    kspec2->kspectotrans = knotspec;
+	kspec->transform( outcpts );
+	knotspec->istransformed = 1;
+    }
+}
+
+
+/*-----------------------------------------------------------------------------
+ * Knotspec::Knotspec -  constuct a knot spec 
+ *-----------------------------------------------------------------------------
+ */
+
+Knotspec::Knotspec( void )
+{
+    bbegin = 0;
+    sbegin = 0;
+    outkbegin = 0;
+}
+
+/*-----------------------------------------------------------------------------
+ * Knotspec::copy -  copy the control points along minor direction 
+ *
+ * Client: Splinespec::copy
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Knotspec::copy( INREAL *inpt, REAL *outpt )
+{
+    inpt = (INREAL *) (((char *) inpt) + preoffset);
+
+    if( next ) {
+        for( REAL *lpt=outpt+prewidth; outpt != lpt; outpt += poststride ) {
+	    next->copy( inpt, outpt );
+	    inpt = (INREAL *) (((char *) inpt) + prestride);
+	}
+   } else {
+        for( REAL *lpt=outpt+prewidth; outpt != lpt; outpt += poststride ) {
+	    pt_io_copy( outpt, inpt );
+	    inpt = (INREAL *) (((char *) inpt) + prestride);
+	}
+     }
+}
+
+/*-----------------------------------------------------------------------------
+ * Knotspec::showpts - print out points before transformation
+ *
+ * Client: Knotspec::select
+ *-----------------------------------------------------------------------------
+ */
+void
+Knotspec::showpts( REAL *outpt )
+{
+    if( next ) {
+        for( REAL *lpt=outpt+prewidth; outpt != lpt; outpt += poststride )
+	    next->showpts( outpt );
+    } else {
+        for( REAL *lpt=outpt+prewidth; outpt != lpt; outpt += poststride )
+	    dprintf(  "show %g %g %g\n", outpt[0], outpt[1], outpt[2] );
+    }
+}
+
+/*-----------------------------------------------------------------------------
+ * Knotspec::factors - precompute scale factors 	
+ *	   - overwrites knot vector, actual new knot vector is NOT produced
+ *
+ * Client: Knotspec::select
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Knotspec::factors( void )
+{
+    Knot *mid = (outkend - 1) - order + bend->multi;
+    Knot_ptr fptr = sbegin;
+
+    for( Breakpt *bpt = bend; bpt >= bbegin; bpt-- ) {
+    	mid -= bpt->multi;		// last knot less than knot to insert
+	int def = bpt->def - 1;		// number of knots to insert
+	if( def <= 0 ) continue;
+	Knot kv = bpt->value;		// knot to insert
+
+	Knot *kf = (mid-def) + (order-1);
+	for( Knot *kl = kf + def; kl != kf; kl-- ) {
+	    Knot *kh, *kt;
+	    for( kt=kl, kh=mid; kt != kf; kh--, kt-- ) 
+		*(fptr++) = (kv - *kh) / (*kt - *kh);
+	    *kl = kv;
+	}
+    }
+}
+
+/*-----------------------------------------------------------------------------
+ * Knotspec::insert - convert subobject in direction of kspec into Bezier
+ *
+ * Client: Knotspec::transform
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Knotspec::insert( REAL *p )
+{
+    Knot_ptr fptr = sbegin;
+    REAL *srcpt = p + prewidth - poststride;
+    REAL *dstpt = p + postwidth + postoffset - poststride;
+    Breakpt *bpt = bend;
+
+   for( REAL *pend = srcpt - poststride*bpt->def; srcpt != pend; pend +=poststride ) {
+	REAL *p1 = srcpt;
+	for( REAL *p2 = srcpt-poststride; p2 != pend; p1 = p2, p2 -= poststride ) {
+	    pt_oo_sum( p1, p1, p2, *fptr, 1.0-*fptr );
+	    fptr++;
+	}
+    }
+
+    for( --bpt; bpt >= bbegin; bpt-- ) {
+
+	for( int multi = bpt->multi; multi > 0; multi-- ) {
+	    pt_oo_copy( dstpt, srcpt );
+	    dstpt -= poststride;
+	    srcpt -= poststride;	
+	}
+    
+	for( REAL *pend = srcpt - poststride*bpt->def; srcpt != pend; pend +=poststride, dstpt-=poststride ) {
+	    pt_oo_copy( dstpt, srcpt );
+	    REAL *p1 = srcpt;
+
+	    for( REAL *p2 = srcpt-poststride; p2 != pend; p1=p2, p2 -= poststride ) {
+		pt_oo_sum( p1, p1, p2, *fptr, 1.0-*fptr );
+		fptr++;
+	    }
+	}
+    }
+}
+
+/*-----------------------------------------------------------------------------
+ * Knotspec::preselect - initialize kspec for processing
+ *
+ * Client: Splinespec::select
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Knotspec::preselect( void )
+{
+    Knot kval; 
+
+    /* position klast after last knot of "last" breakpoint */
+    for( klast = inkend - order, kval = *klast; klast != inkend; klast++ ) 
+	if( ! identical( *klast, kval ) ) break;
+
+    /* position kfirst after last knot of "first" breakpoint */
+    for( kfirst = inkbegin+order-1, kval= *kfirst;  kfirst != inkend; kfirst++ )
+	if( ! identical( *kfirst, kval ) ) break;
+
+    /* compute multiplicity of first breakpoint */
+    Knot_ptr k;
+    for( k  = kfirst - 1; k >= inkbegin; k-- ) 
+	if( ! identical( kval, *k ) ) break;    
+    k++;
+
+    /* allocate space for breakpoints -
+       use worst case estimate on number of breakpoints */
+
+    bbegin = new Breakpt[(klast - kfirst)+1];
+    /* record multiplicity and value of first breakpoint */
+    bbegin->multi = kfirst - k;
+    bbegin->value = kval;
+    bend = bbegin;
+
+    kleft = kright = kfirst;
+}
+
+
+/*-----------------------------------------------------------------------------
+ * Knotspec::select - Knotspec::select segments and precompute scale factors
+ *
+ * Client: Splinespec::select
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Knotspec::select( void )
+{
+    breakpoints();
+    knots();
+    factors();
+    
+    preoffset	= kleft - (inkbegin + order);
+    postwidth	= (int)((bend - bbegin) * order);
+    prewidth 	= (int)((outkend - outkbegin) - order);
+    postoffset  = (bbegin->def > 1) ? (bbegin->def-1) : 0;
+}
+ 
+/*-----------------------------------------------------------------------------
+ * Knotspec::breakpoints - compute breakpoints for knotspec
+ *
+ * Client: Knotspec::select
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Knotspec::breakpoints( void )
+{
+    Breakpt *ubpt	= bbegin;
+    Breakpt *ubend	= bend;
+    long    nfactors  	= 0;
+
+    ubpt->value	= ubend->value;
+    ubpt->multi	= ubend->multi;
+
+    kleft = kright;
+
+    for( ; kright != klast; kright++ ) {
+        if ( identical(*kright,ubpt->value) ) {
+	    (ubpt->multi)++;
+	} else {
+    	    ubpt->def = (int) (order - ubpt->multi);
+    	    nfactors += (ubpt->def * (ubpt->def - 1)) / 2;
+	    (++ubpt)->value = *kright;
+	    ubpt->multi = 1;
+	}
+    }
+    ubpt->def = (int) (order - ubpt->multi);
+    nfactors += (ubpt->def * (ubpt->def - 1)) / 2;
+
+    bend = ubpt;
+
+    if( nfactors ) {	    
+        sbegin = new Knot[nfactors];
+    } else {
+	sbegin = NULL;
+    }
+}
+
+
+/*-----------------------------------------------------------------------------
+ * Knotspec::knots - copy relevant subsequence of knots into temporary area
+ *
+ * Client: Knotspec::select
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Knotspec::knots( void )
+{
+    Knot_ptr inkpt = kleft - order;
+    Knot_ptr inkend = kright  + bend->def;
+
+    /* allocate space for knots and factors */
+    outkbegin = new Knot[inkend-inkpt];
+    Knot_ptr outkpt;
+    for( outkpt = outkbegin; inkpt != inkend; inkpt++, outkpt++ ) 
+	*outkpt = *inkpt;
+
+    outkend = outkpt;
+}
+
+
+/*-----------------------------------------------------------------------------
+ * Knotspec::transform -	convert a spline along a given direction 
+ *
+ * Client: Splienspec::transform
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Knotspec::transform( REAL *p )
+{
+   if( next ) {
+	if( this == kspectotrans ) {
+	    next->transform( p );
+	} else {
+	    if( istransformed ) {
+		p += postoffset;
+		for( REAL *pend = p + postwidth; p != pend; p += poststride )
+		    next->transform( p );
+	    } else {
+		REAL *pend = p + prewidth;
+		for( ; p != pend; p += poststride )
+		    next->transform( p );
+	    }
+	}
+   } else {
+	if( this == kspectotrans ) {
+	    insert( p );
+	} else {
+	    if( istransformed ) {
+		p += postoffset;
+		for( REAL *pend = p + postwidth; p != pend; p += poststride )
+		    kspectotrans->insert( p );
+	    } else {
+		REAL *pend = p + prewidth;
+		for( ; p != pend; p += poststride )
+		    kspectotrans->insert( p );
+	    }
+	}
+   }
+}
+
+/*-----------------------------------------------------------------------------
+ * Knotspec::~Knotspec - free space alocated for knotspec
+ *-----------------------------------------------------------------------------
+ */
+
+Knotspec::~Knotspec( void )
+{
+    if( bbegin ) delete[] bbegin;
+    if( sbegin ) delete[] sbegin;
+    if( outkbegin ) delete[] outkbegin;
+}
+
+
+/*-----------------------------------------------------------------------------
+ * pt_io_copy - make internal copy of input cntrl pt. of x coords
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Knotspec::pt_io_copy( REAL *topt, INREAL *frompt )
+{
+    switch( ncoords ) {
+    case 4:
+        topt[3] = (REAL) frompt[3];
+    case 3:
+        topt[2] = (REAL) frompt[2];
+    case 2:
+        topt[1] = (REAL) frompt[1];
+    case 1:
+        topt[0] = (REAL) frompt[0];
+	break;
+    default: {
+	    for( int i = 0; i < ncoords; i++ )
+		*topt++ = (REAL) *frompt++;
+	}
+    }
+}
+
+/*-----------------------------------------------------------------------------
+ * pt_oo_copy - make internal copy of internal cntrl pt. of x coords
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Knotspec::pt_oo_copy( REAL *topt, REAL *frompt )
+{
+    switch( ncoords ) {
+    case 4:
+        topt[3] = frompt[3];
+    case 3:
+        topt[2] = frompt[2];
+    case 2:
+        topt[1] = frompt[1];
+    case 1:
+        topt[0] = frompt[0];
+	break;
+    default:
+	memcpy( topt, frompt, ncoords * sizeof( REAL ) );
+    }
+}
+
+/*-----------------------------------------------------------------------------
+ * pt_oo_sum - compute affine combination of internal cntrl pts
+ *-----------------------------------------------------------------------------
+ */
+
+void
+Knotspec::pt_oo_sum( REAL *x, REAL *y, REAL *z, Knot a, Knot b )
+{
+    switch( ncoords ) {
+    case 4:
+        x[3] = a * y[3]  +  b * z[3];
+    case 3:
+        x[2] = a * y[2]  +  b * z[2];
+    case 2:
+        x[1] = a * y[1]  +  b * z[1];
+    case 1:
+        x[0] = a * y[0]  +  b * z[0];
+	break;
+    default: {
+          for( int i = 0; i < ncoords; i++ )
+              *x++ = a * *y++   +   b * *z++;
+    }
+    }
+}
diff --git a/src/glu/sgi/libnurbs/internals/trimline.cc b/src/glu/sgi/libnurbs/internals/trimline.cc
new file mode 100644
index 00000000000..72ace36999f
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/trimline.cc
@@ -0,0 +1,225 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * trimline.c++
+ *
+ * $Date: 2005/10/28 13:09:08 $ $Revision: 1.1.30.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/trimline.cc,v 1.1.30.1 2005/10/28 13:09:08 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "trimline.h"
+#include "backend.h"
+
+Trimline::Trimline()
+{
+    size = 0; pts = 0; numverts = 0;
+    tinterp = &t; binterp = &b; 
+}
+
+Trimline::~Trimline()
+{
+    if( pts ) delete[] pts; 
+}
+
+void 
+Trimline::init( TrimVertex *v )
+{
+    reset();
+    grow(1);
+    append(v);
+}
+
+inline void
+Trimline::grow( long npts )
+{
+    if( size < npts ) {
+	size = 2 * npts;
+	if( pts ) delete[] pts; 
+        pts = new TrimVertex_p[size];
+    }
+}
+
+inline void
+Trimline::append( TrimVertex *v )
+{
+    assert( numverts != size ); 
+    pts[numverts++] = v;
+}
+
+void
+Trimline::init( long npts, Arc_ptr jarc, long last )
+{
+    jarcl.init( jarc, 0, last );
+    grow( npts + 2 );
+}
+
+inline void
+Trimline::swap()
+{
+    TrimVertex *tmp=tinterp; 
+    tinterp=binterp; 
+    binterp=tmp;
+}
+
+void
+Trimline::getNextPt()
+{
+    *binterp = *jarcl.getnextpt();    
+}
+
+void 
+Trimline::getPrevPt()
+{
+    *binterp = *jarcl.getprevpt();
+}
+
+/*----------------------------------------------------------------------
+ * getNextPts - make arrays of pointers to trim points on left and right
+ *		hulls of trim strip.
+ *----------------------------------------------------------------------
+ */
+void
+Trimline::getNextPts( REAL vval, Backend& backend )
+{
+    reset(); swap(); append( tinterp );
+    assert( tinterp->param[1] >= vval );
+
+    register TrimVertex *p;
+    for( p=jarcl.getnextpt() ; p->param[1] >= vval; p=jarcl.getnextpt() ) {
+	append( p ); 
+    }
+
+    /* compute and copy pointer to final point on left hull */
+    if( interpvert( last(), p, binterp, vval ) ) {
+	binterp->nuid = p->nuid;
+	backend.triangle( p, binterp, last() );
+        append( binterp );
+    }
+    jarcl.reverse();
+    (void) jarcl.getprevpt(); 	/* reset jarcl to proper position */
+    jarcl.reverse();
+}
+
+void 
+Trimline::getPrevPts( REAL vval, Backend& backend )
+{
+    reset(); swap(); append( tinterp );
+    assert( tinterp->param[1] >= vval );
+
+    register TrimVertex *q;
+    for( q=jarcl.getprevpt(); q->param[1] >= vval; q=jarcl.getprevpt() ) {
+	append( q );
+    }
+
+    /* compute and copy pointer to final point on right hull */
+    if( interpvert( q, last(), binterp, vval ) ) {
+	binterp->nuid = q->nuid;
+	backend.triangle( last(), binterp, q );
+        append( binterp );
+    }
+    jarcl.reverse();
+    (void) jarcl.getnextpt();  /* reset jarcl to proper position */
+    jarcl.reverse();
+}
+
+void
+Trimline::getNextPts( Arc_ptr botarc )
+{
+    reset(); swap(); append( tinterp );
+
+#ifndef NDEBUG
+    PwlArc *lastpwl = botarc->prev->pwlArc;
+    TrimVertex *lastpt1 = &lastpwl->pts[lastpwl->npts-1];
+#endif
+    TrimVertex *lastpt2 = botarc->pwlArc->pts;
+    register TrimVertex *p = jarcl.getnextpt();
+    for( append( p ); p != lastpt2; append( p ) ) {
+	assert( p != lastpt1 );
+	p = jarcl.getnextpt();
+    }
+}
+
+void
+Trimline::getPrevPts( Arc_ptr botarc )
+{
+    reset();  swap(); append( tinterp );
+
+    PwlArc *lastpwl = botarc->prev->pwlArc;
+    TrimVertex *lastpt1 = &lastpwl->pts[lastpwl->npts-1];
+#ifndef NDEBUG
+    TrimVertex *lastpt2 = botarc->pwlArc->pts;
+#endif
+
+    register TrimVertex *q =  jarcl.getprevpt();
+    for( append( q ); q != lastpt1; append( q ) ) {
+	assert( q != lastpt2 );
+	q = jarcl.getprevpt();
+    }
+}
+
+
+long
+Trimline::interpvert( TrimVertex *a, TrimVertex *b, TrimVertex *c, REAL vval )
+{
+    REAL denom = a->param[1] - b->param[1];
+
+    if(denom != 0) {
+	if( vval == a->param[1] ) {
+	    c->param[0] = a->param[0]; 
+	    c->param[1] = a->param[1];
+	    c->nuid = a->nuid;
+	    return 0;
+	} else if( vval == b->param[1] ) {
+	    c->param[0] = b->param[0]; 
+	    c->param[1] = b->param[1];
+	    c->nuid = b->nuid;
+	    return 0;
+	} else {
+	    REAL r = (a->param[1] - vval)/denom;
+	    c->param[0] =  a->param[0] - r * (a->param[0] - b->param[0]);
+	    c->param[1] = vval;
+	    return 1;
+	}
+    } else {
+        c->param[0] = a->param[0]; 
+        c->param[1] = a->param[1];
+	c->nuid = a->nuid;
+	return 0;
+    }
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/trimline.h b/src/glu/sgi/libnurbs/internals/trimline.h
new file mode 100644
index 00000000000..13bb3e2adf9
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/trimline.h
@@ -0,0 +1,109 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * trimline.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/trimline.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glutrimline_h_
+#define __glutrimline_h_
+
+class Arc;
+class Backend;
+
+#include "trimvertex.h"
+#include "jarcloc.h"
+
+
+class Trimline {
+private:
+    TrimVertex**	pts; 	
+    long 		numverts;
+    long		i;
+    long		size;
+    Jarcloc		jarcl;
+    TrimVertex		t, b;
+    TrimVertex 		*tinterp, *binterp;
+    void		reset( void ) { numverts = 0; }
+    inline void		grow( long );
+    inline void		swap( void );
+    inline void		append( TrimVertex * );
+    static long		interpvert( TrimVertex *, TrimVertex *, TrimVertex *, REAL );
+
+
+
+public:
+			Trimline();
+			~Trimline();
+    void		init( TrimVertex * );
+    void		init( long, Arc_ptr, long );
+    void		getNextPt( void );
+    void		getPrevPt( void );
+    void		getNextPts( REAL, Backend & );
+    void		getPrevPts( REAL, Backend & );
+    void		getNextPts( Arc_ptr );
+    void		getPrevPts( Arc_ptr );
+    inline TrimVertex *	next( void );
+    inline TrimVertex *	prev( void ); 
+    inline TrimVertex *	first( void );
+    inline TrimVertex *	last( void );
+};
+
+inline TrimVertex *
+Trimline::next( void ) 
+{
+    if( i < numverts) return pts[i++]; else return 0; 
+} 
+
+inline TrimVertex *
+Trimline::prev( void ) 
+{
+    if( i >= 0 ) return pts[i--]; else return 0; 
+} 
+
+inline TrimVertex *
+Trimline::first( void ) 
+{
+    i = 0; return pts[i]; 
+}
+
+inline TrimVertex *
+Trimline::last( void ) 
+{
+    i = numverts; return pts[--i]; 
+}  
+#endif /* __glutrimline_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/trimregion.cc b/src/glu/sgi/libnurbs/internals/trimregion.cc
new file mode 100644
index 00000000000..469f03678ff
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/trimregion.cc
@@ -0,0 +1,116 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * trimregion.c++
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/trimregion.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "trimregion.h"
+#include "backend.h"
+
+TrimRegion::TrimRegion( void )
+{
+}
+
+void
+TrimRegion::setDu( REAL du )
+{
+    oneOverDu = 1.0/du;
+}
+
+void
+TrimRegion::init( long npts, Arc_ptr extrema )
+{
+    left.init( npts, extrema, extrema->pwlArc->npts - 1 ); 
+    left.getNextPt();
+
+    right.init( npts, extrema, 0 ); 
+    right.getPrevPt();
+}
+
+void
+TrimRegion::getPts( Arc_ptr extrema )
+{
+    left.getNextPts( extrema );
+    right.getPrevPts( extrema );
+}
+
+void
+TrimRegion::getPts( Backend &backend )
+{
+    left.getNextPts( bot.vval, backend );
+    right.getPrevPts( bot.vval, backend );
+}
+
+void 
+TrimRegion::getGridExtent( void )
+{
+    getGridExtent( left.last(), right.last() );
+}
+
+void
+TrimRegion::getGridExtent( TrimVertex *l, TrimVertex *r )
+{
+    bot.ustart = (long) ((l->param[0] - uarray.uarray[0])*oneOverDu);
+    if( l->param[0] >= uarray.uarray[bot.ustart] ) bot.ustart++;
+//  if( l->param[0] > uarray.uarray[bot.ustart] ) bot.ustart++;
+    assert( l->param[0] <= uarray.uarray[bot.ustart] );
+    assert( l->param[0] >= uarray.uarray[bot.ustart-1] );
+
+    bot.uend = (long) ((r->param[0] - uarray.uarray[0])*oneOverDu);
+    if( uarray.uarray[bot.uend] >= r->param[0] ) bot.uend--;
+//  if( uarray.uarray[bot.uend] > r->param[0] ) bot.uend--;
+    assert( r->param[0] >= uarray.uarray[bot.uend] );
+    assert( r->param[0] <= uarray.uarray[bot.uend+1] );
+}
+
+int
+TrimRegion::canTile( void )
+{
+    TrimVertex *lf = left.first();
+    TrimVertex *ll = left.last();
+    TrimVertex *l = ( ll->param[0] > lf->param[0] ) ? ll : lf; 
+
+    TrimVertex *rf = right.first();
+    TrimVertex *rl = right.last();
+    TrimVertex *r = ( rl->param[0] < rf->param[0] ) ? rl : rf;
+    return (l->param[0] <= r->param[0]) ? 1 : 0;
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/trimregion.h b/src/glu/sgi/libnurbs/internals/trimregion.h
new file mode 100644
index 00000000000..58dfe24914f
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/trimregion.h
@@ -0,0 +1,90 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * trimregion.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/trimregion.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glutrimregion_h_
+#define __glutrimregion_h_
+
+#include "trimline.h"
+#include "gridline.h"
+#include "uarray.h"
+
+class Arc;
+class Backend;
+
+class TrimRegion {
+public:
+			TrimRegion();
+    Trimline		left;
+    Trimline		right;
+    Gridline		top;
+    Gridline		bot;
+    Uarray		uarray;
+
+    void		init( REAL );
+    void		advance( REAL, REAL, REAL );
+    void		setDu( REAL );
+    void		init( long, Arc_ptr );
+    void		getPts( Arc_ptr );
+    void		getPts( Backend & );
+    void		getGridExtent( TrimVertex *, TrimVertex * );
+    void		getGridExtent( void );
+    int			canTile( void );
+private:
+    REAL		oneOverDu;
+};
+
+inline void
+TrimRegion::init( REAL vval ) 
+{
+    bot.vval = vval;
+}
+
+inline void
+TrimRegion::advance( REAL topVindex, REAL botVindex, REAL botVval )
+{
+    top.vindex	= (long) topVindex;
+    bot.vindex	= (long) botVindex;
+    top.vval	= bot.vval;
+    bot.vval	= botVval;
+    top.ustart	= bot.ustart;
+    top.uend	= bot.uend;
+}
+#endif /* __glutrimregion_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/trimvertex.h b/src/glu/sgi/libnurbs/internals/trimvertex.h
new file mode 100644
index 00000000000..5e3ea780151
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/trimvertex.h
@@ -0,0 +1,69 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * trimvertex.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/trimvertex.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glutrimvertex_h_
+#define __glutrimvertex_h_
+
+#include "types.h"
+
+/*#define USE_OPTTT*/
+
+class TrimVertex { /* a vertex on a trim curve */
+public:
+    REAL		param[2];	/* parametric space coords */
+#ifdef USE_OPTTT
+    REAL                cache_point[4]; //only when USE_OPTTT is on in slicer.c++
+    REAL                cache_normal[3];
+#endif
+    long		nuid;
+};
+
+typedef class TrimVertex *TrimVertex_p;
+
+inline REAL  
+det3( TrimVertex *a, TrimVertex *b, TrimVertex *c ) 
+{         
+    return a->param[0] * (b->param[1]-c->param[1]) + 
+	   b->param[0] * (c->param[1]-a->param[1]) + 
+	   c->param[0] * (a->param[1]-b->param[1]);
+}
+
+#endif /* __glutrimvertex_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/trimvertpool.cc b/src/glu/sgi/libnurbs/internals/trimvertpool.cc
new file mode 100644
index 00000000000..f18c8c8b3eb
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/trimvertpool.cc
@@ -0,0 +1,121 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * trimvertexpool.c++
+ *
+ * $Date: 2003/05/08 15:47:00 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/trimvertpool.cc,v 1.2 2003/05/08 15:47:00 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "mystring.h"
+#include "trimvertex.h"
+#include "trimvertpool.h"
+#include "bufpool.h"
+
+/*----------------------------------------------------------------------------
+ * TrimVertexPool::TrimVertexPool 
+ *----------------------------------------------------------------------------
+ */
+TrimVertexPool::TrimVertexPool( void )
+	: pool( sizeof(TrimVertex)*3, 32, "Threevertspool" )
+{
+    // initialize array of pointers to vertex lists
+    nextvlistslot = 0;
+    vlistsize = INIT_VERTLISTSIZE;
+    vlist = new TrimVertex_p[vlistsize];
+}
+
+/*----------------------------------------------------------------------------
+ * TrimVertexPool::~TrimVertexPool 
+ *----------------------------------------------------------------------------
+ */
+TrimVertexPool::~TrimVertexPool( void )
+{
+    // free all arrays of TrimVertices vertices
+    while( nextvlistslot ) {
+	delete [] vlist[--nextvlistslot];
+    }
+
+    // reallocate space for array of pointers to vertex lists
+    if( vlist ) delete[] vlist;
+}
+
+/*----------------------------------------------------------------------------
+ * TrimVertexPool::clear 
+ *----------------------------------------------------------------------------
+ */
+void
+TrimVertexPool::clear( void )
+{
+    // reinitialize pool of 3 vertex arrays    
+    pool.clear();
+
+    // free all arrays of TrimVertices vertices
+    while( nextvlistslot ) {
+	delete [] vlist[--nextvlistslot];
+	vlist[nextvlistslot] = 0;
+    }
+
+    // reallocate space for array of pointers to vertex lists
+    if( vlist ) delete[] vlist;
+    vlist = new TrimVertex_p[vlistsize];
+}
+
+
+/*----------------------------------------------------------------------------
+ * TrimVertexPool::get - allocate a vertex list
+ *----------------------------------------------------------------------------
+ */
+TrimVertex *
+TrimVertexPool::get( int n )
+{
+    TrimVertex	*v;
+    if( n == 3 ) {
+	v = (TrimVertex *) pool.new_buffer();
+    } else {
+        if( nextvlistslot == vlistsize ) {
+	    vlistsize *= 2;
+	    TrimVertex_p *nvlist = new TrimVertex_p[vlistsize];
+	    memcpy( nvlist, vlist, nextvlistslot * sizeof(TrimVertex_p) );
+	    if( vlist ) delete[] vlist;
+	    vlist = nvlist;
+        }
+        v = vlist[nextvlistslot++] = new TrimVertex[n];
+    }
+    return v;
+}
diff --git a/src/glu/sgi/libnurbs/internals/trimvertpool.h b/src/glu/sgi/libnurbs/internals/trimvertpool.h
new file mode 100644
index 00000000000..afeedfe0bde
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/trimvertpool.h
@@ -0,0 +1,63 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * trimvertexpool.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/trimvertpool.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glutrimvertpool_h_
+#define __glutrimvertpool_h_
+
+#include "bufpool.h"
+
+class TrimVertex;
+
+#define INIT_VERTLISTSIZE  200
+
+class TrimVertexPool {
+public:
+    			TrimVertexPool( void );
+    			~TrimVertexPool( void );
+    void		clear( void );
+    TrimVertex *	get( int );
+private:
+    Pool		pool;
+    TrimVertex **	vlist;
+    int			nextvlistslot;
+    int			vlistsize;
+};
+#endif /* __glutrimvertpool_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/types.h b/src/glu/sgi/libnurbs/internals/types.h
new file mode 100644
index 00000000000..7b7910d3ada
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/types.h
@@ -0,0 +1,53 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * types.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/types.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __glutypes_h_
+#define __glutypes_h_
+
+//typedef double		INREAL;
+#define INREAL          float
+typedef float		REAL;
+typedef void 		(*Pfvv)( void );
+typedef void 		(*Pfvf)( float * );
+typedef int		(*cmpfunc)(const void *, const void *);
+typedef	REAL		Knot, *Knot_ptr;/* knot values */
+
+#endif /* __glutypes_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/uarray.cc b/src/glu/sgi/libnurbs/internals/uarray.cc
new file mode 100644
index 00000000000..5d00f5d09b7
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/uarray.cc
@@ -0,0 +1,74 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * uarray.c++
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/uarray.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "uarray.h"
+#include "arc.h"
+
+Uarray::Uarray( void )
+{
+    uarray = 0;
+    size = 0;
+}
+
+Uarray::~Uarray( void )
+{
+    if( uarray ) delete[] uarray;		
+}
+
+long
+Uarray::init( REAL delta, Arc_ptr lo, Arc_ptr hi )
+{
+    ulines = (long) ((hi->tail()[0] - lo->tail()[0])/delta) + 3;
+    if( size < ulines ) {
+	size = ulines * 2;
+	if( uarray ) delete[] uarray;		
+	uarray = new REAL[size];
+	assert( uarray != 0);
+    }
+    uarray[0] = lo->tail()[0] - delta/2.0;
+    for( long i = 1 ; i != ulines; i++ )
+	uarray[i] = uarray[0] + i*delta;
+    return ulines;
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/uarray.h b/src/glu/sgi/libnurbs/internals/uarray.h
new file mode 100644
index 00000000000..ae1b1c80916
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/uarray.h
@@ -0,0 +1,61 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * uarray.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/uarray.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __gluuarray_h_
+#define __gluuarray_h_
+
+#include "types.h"
+
+class Arc;
+typedef class Arc *Arc_ptr; 
+
+class Uarray {
+private:
+    long		size;
+    long		ulines;
+public:
+			Uarray();
+			~Uarray();
+    long		init( REAL, Arc_ptr, Arc_ptr );
+    REAL *		uarray;
+};
+
+#endif /* __gluuarray_h_ */
diff --git a/src/glu/sgi/libnurbs/internals/varray.cc b/src/glu/sgi/libnurbs/internals/varray.cc
new file mode 100644
index 00000000000..9b60f59b72a
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/varray.cc
@@ -0,0 +1,146 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * varray.c++
+ *
+ * $Date: 2002/11/01 23:35:07 $ $Revision: 1.2 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/varray.cc,v 1.2 2002/11/01 23:35:07 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "varray.h"
+#include "arc.h"
+#include "simplemath.h"         // glu_abs()
+
+#define TINY 0.0001
+inline long sgn( REAL x ) 
+{
+    return (x < -TINY) ? -1 :  ((x > TINY) ? 1 : 0 );
+}
+
+
+Varray::Varray( void )
+{
+    varray = 0;
+    size = 0;
+}
+
+Varray::~Varray( void )
+{
+    if( varray ) delete[] varray; 
+}
+
+inline void
+Varray::update( Arc_ptr arc, long dir[2], REAL val )
+{
+    register long ds = sgn(arc->tail()[0] - arc->prev->tail()[0]);
+    register long dt = sgn(arc->tail()[1] - arc->prev->tail()[1]);
+
+    if( dir[0] != ds || dir[1] != dt ) {
+	dir[0] = ds;
+	dir[1] = dt;
+	append( val );
+    }
+}
+
+void
+Varray::grow( long guess )
+{
+    if( size < guess ) {
+	size = guess * 2;
+	if( varray ) delete[] varray; 
+	varray = new REAL[size];
+	assert( varray != 0 );
+    }
+}
+
+long
+Varray::init( REAL delta, Arc_ptr toparc, Arc_ptr botarc )
+{
+    Arc_ptr left = toparc->next;
+    Arc_ptr right = toparc;
+    long ldir[2], rdir[2];
+    
+    ldir[0] = sgn( left->tail()[0] - left->prev->tail()[0] );
+    ldir[1] = sgn( left->tail()[1] - left->prev->tail()[1] );
+    rdir[0] = sgn( right->tail()[0] - right->prev->tail()[0] );
+    rdir[1] = sgn( right->tail()[1] - right->prev->tail()[1] );
+
+    vval[0] = toparc->tail()[1];
+    numquads = 0;
+
+    while( 1 ) {
+	switch( sgn( left->tail()[1] - right->prev->tail()[1] ) ) {
+	case 1:
+	    left = left->next;
+	    update( left, ldir, left->prev->tail()[1] );
+	    break;
+	case -1: 
+	    right = right->prev;
+	    update( right, rdir, right->tail()[1] );
+	    break;
+	case 0:
+	    if( glu_abs(left->tail()[1] - botarc->tail()[1]) < TINY) goto end;
+            if( glu_abs(left->tail()[0]-right->prev->tail()[0]) < TINY &&
+                glu_abs(left->tail()[1]-right->prev->tail()[1]) < TINY) goto end;
+	    left = left->next;
+	    break;
+ 	}
+    }
+
+end:
+    append( botarc->tail()[1] );
+
+    grow( ((long) ((vval[0] - vval[numquads])/delta)) + numquads + 2 );
+
+    long i, index = 0;
+    for( i=0; i<numquads; i++ ) {
+	voffset[i] = index;
+        varray[index++] = vval[i];
+	REAL dist = vval[i] - vval[i+1];
+	if( dist > delta ) {
+	    long steps = ((long) (dist/delta)) +1;
+	    float deltav = - dist / (REAL) steps;
+	    for( long j=1; j<steps; j++ ) 
+		varray[index++] = vval[i] + j * deltav; 
+	}
+    }
+    voffset[i] = index;
+    varray[index] = vval[i];
+    return index;
+}
+
diff --git a/src/glu/sgi/libnurbs/internals/varray.h b/src/glu/sgi/libnurbs/internals/varray.h
new file mode 100644
index 00000000000..3e4cfdf7aa3
--- /dev/null
+++ b/src/glu/sgi/libnurbs/internals/varray.h
@@ -0,0 +1,74 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * varray.h
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /cvs/mesa/Mesa/src/glu/sgi/libnurbs/internals/varray.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#ifndef __gluvarray_h_
+#define __gluvarray_h_
+
+#include "types.h"
+
+class Arc;
+
+class Varray {
+public:
+			Varray();
+			~Varray();
+    long		init( REAL, Arc *, Arc * );
+    REAL *		varray;
+    REAL		vval[1000];
+    long		voffset[1000];
+    long 		numquads;
+
+private:
+    long		size;
+    inline void		update( Arc *, long[2], REAL );
+    void		grow( long );
+    inline void		append( REAL );
+};
+
+inline void
+Varray::append( REAL v ) 
+{
+    if( v != vval[numquads] )
+        vval[++numquads] = v; 
+}
+
+
+#endif /* __gluvarray_h_ */