--- /dev/null
+/*
+** 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++
+ *
+ */
+
+//#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
+ _glu_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
+ _glu_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
+ _glu_dprintf( "decr\n" );
+#endif
+ v1 = v1next--;
+ if( v1 == v1last ) {
+#ifdef DEBUG
+ _glu_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
+ _glu_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
+ _glu_dprintf( "incr\n" );
+#endif
+ v2 = v2next++;
+ if( v2 == v2last ) {
+#ifdef DEBUG
+ _glu_dprintf( "no good results\n" );
+#endif
+ return 0; // ill-conditioned, guess answer
+ }
+ }
+ break;
+ case 1:
+ return 0;
+ }
+ } else {
+#ifndef NDEBUG
+ _glu_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
+ _glu_dprintf( "incr\n" );
+#endif
+ v2 = v2next++;
+ if( v2 == v2last ) {
+#ifdef DEBUG
+ _glu_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
+ _glu_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
+ _glu_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
+ _glu_dprintf( "decr\n" );
+#endif
+ if( v1 == v1last ) {
+#ifdef DEBUG
+ _glu_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
+ _glu_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
+ _glu_dprintf( "incr\n" );
+#endif
+ if( v2 == v2last ) {
+#ifdef DEBUG
+ _glu_dprintf( "no good results\n" );
+#endif
+ return 0; // ill-conditioned, guess answer
+ }
+ }
+ break;
+ case 1:
+ return 1;
+ }
+ } else {
+#ifdef DEBUG
+ _glu_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
+ _glu_dprintf( "incr\n" );
+#endif
+ if( v2 == v2last ) {
+#ifdef DEBUG
+ _glu_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
+ _glu_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
+ _glu_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
+ _glu_dprintf( "decr\n" );
+#endif
+ v1 = v1next--;
+ if( v1 == v1last ) {
+#ifdef DEBUG
+ _glu_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
+ _glu_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
+ _glu_dprintf( "incr\n" );
+#endif
+ v2 = v2next++;
+ if( v2 == v2last ) {
+#ifdef DEBUG
+ _glu_dprintf( "no good results\n" );
+#endif
+ return 0; // ill-conditioned, guess answer
+ }
+ }
+ break;
+ case 1:
+ return 1;
+ }
+ } else {
+#ifdef DEBUG
+ _glu_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
+ _glu_dprintf( "incr\n" );
+#endif
+ v2 = v2next++;
+ if( v2 == v2last ) {
+#ifdef DEBUG
+ _glu_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
+ _glu_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
+ _glu_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
+ _glu_dprintf( "decr\n" );
+#endif
+ if( v1 == v1last ) {
+#ifdef DEBUG
+ _glu_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
+ _glu_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
+ _glu_dprintf( "incr\n" );
+#endif
+ if( v2 == v2last ) {
+#ifdef DEBUG
+ _glu_dprintf( "no good results\n" );
+#endif
+ return 0; // ill-conditioned, guess answer
+ }
+ }
+ break;
+ case 1:
+ return 0;
+ }
+ } else {
+#ifdef DEBUG
+ _glu_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
+ _glu_dprintf( "incr\n" );
+#endif
+ if( v2 == v2last ) {
+#ifdef DEBUG
+ _glu_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;
+}
projects / reactos.git / blobdiff