SGI SI GLU library

1 files changed, 442 insertions, 0 deletions

diff --git a/src/glu/sgi/libnurbs/internals/coveandtiler.cc b/src/glu/sgi/libnurbs/internals/coveandtiler.cc
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+++ b/src/glu/sgi/libnurbs/internals/coveandtiler.cc
@@ -0,0 +1,442 @@
+/*
+** 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++
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/coveandtiler.cc,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#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;
+	    }
+	}
+    }
+}
+