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diff --git a/src/glu/sgi/libnurbs/internals/mesher.cc b/src/glu/sgi/libnurbs/internals/mesher.cc
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-/*
-** 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++
- *
- */
-
-#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;
- last[0] = 0;
- last[1] = 0;
- itop = 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 );
- }
-}
-
-
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