SGI SI GLU library

1 files changed, 172 insertions, 0 deletions

diff --git a/src/glu/sgi/libnurbs/internals/patchlist.cc b/src/glu/sgi/libnurbs/internals/patchlist.cc
new file mode 100644
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+++ 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: /home/krh/git/sync/mesa-cvs-repo/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;
+}