FreeWRL / FreeX3D 4.3.0
arcsorter.cc
1/*
2** License Applicability. Except to the extent portions of this file are
3** made subject to an alternative license as permitted in the SGI Free
4** Software License B, Version 1.1 (the "License"), the contents of this
5** file are subject only to the provisions of the License. You may not use
6** this file except in compliance with the License. You may obtain a copy
7** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
8** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
9**
10** http://oss.sgi.com/projects/FreeB
11**
12** Note that, as provided in the License, the Software is distributed on an
13** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
14** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
15** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
16** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
17**
18** Original Code. The Original Code is: OpenGL Sample Implementation,
19** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
20** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
21** Copyright in any portions created by third parties is as indicated
22** elsewhere herein. All Rights Reserved.
23**
24** Additional Notice Provisions: The application programming interfaces
25** established by SGI in conjunction with the Original Code are The
26** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
27** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
28** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
29** Window System(R) (Version 1.3), released October 19, 1998. This software
30** was created using the OpenGL(R) version 1.2.1 Sample Implementation
31** published by SGI, but has not been independently verified as being
32** compliant with the OpenGL(R) version 1.2.1 Specification.
33*/
34
35/*
36 * arcsorter.c++
37 *
38 */
39
40#if defined(__unix__) && !defined(ANDROIDNDK)
41#include "GL/glu.h"
42#endif
43
44#ifndef __gluarcsorter_c_
45#define __gluarcsorter_c_
46
47#include "glimports.h"
48#include "arc.h"
49#include "arcsorter.h"
50#include "subdivider.h"
51
52ArcSorter::ArcSorter(Subdivider &s) : Sorter( sizeof( Arc ** ) ), subdivider(s)
53{
54}
55
56int
57ArcSorter::qscmp( char *, char * )
58{
59 _glu_dprintf( "ArcSorter::qscmp: pure virtual called\n" );
60 return 0;
61}
62
63void
64ArcSorter::qsort( Arc **a, int n )
65{
66 Sorter::qsort( (void *) a, n );
67}
68
69void
70ArcSorter::qsexc( char *i, char *j )// i<-j, j<-i
71{
72 Arc **jarc1 = (Arc **) i;
73 Arc **jarc2 = (Arc **) j;
74 Arc *tmp = *jarc1;
75 *jarc1 = *jarc2;
76 *jarc2 = tmp;
77}
78
79void
80ArcSorter::qstexc( char *i, char *j, char *k )// i<-k, k<-j, j<-i
81{
82 Arc **jarc1 = (Arc **) i;
83 Arc **jarc2 = (Arc **) j;
84 Arc **jarc3 = (Arc **) k;
85 Arc *tmp = *jarc1;
86 *jarc1 = *jarc3;
87 *jarc3 = *jarc2;
88 *jarc2 = tmp;
89}
90
91
92ArcSdirSorter::ArcSdirSorter( Subdivider &s ) : ArcSorter(s)
93{
94}
95
96int
97ArcSdirSorter::qscmp( char *i, char *j )
98{
99 Arc *jarc1 = *(Arc **) i;
100 Arc *jarc2 = *(Arc **) j;
101
102 int v1 = (jarc1->getitail() ? 0 : (jarc1->pwlArc->npts - 1));
103 int v2 = (jarc2->getitail() ? 0 : (jarc2->pwlArc->npts - 1));
104
105 REAL diff = jarc1->pwlArc->pts[v1].param[1] -
106 jarc2->pwlArc->pts[v2].param[1];
107
108 if( diff < 0.0)
109 return -1;
110 else if( diff > 0.0)
111 return 1;
112 else {
113 if( v1 == 0 ) {
114 if( jarc2->tail()[0] < jarc1->tail()[0] ) {
115 return subdivider.ccwTurn_sl( jarc2, jarc1 ) ? 1 : -1;
116 } else {
117 return subdivider.ccwTurn_sr( jarc2, jarc1 ) ? -1 : 1;
118 }
119 } else {
120 if( jarc2->head()[0] < jarc1->head()[0] ) {
121 return subdivider.ccwTurn_sl( jarc1, jarc2 ) ? -1 : 1;
122 } else {
123 return subdivider.ccwTurn_sr( jarc1, jarc2 ) ? 1 : -1;
124 }
125 }
126 }
127}
128
129ArcTdirSorter::ArcTdirSorter( Subdivider &s ) : ArcSorter(s)
130{
131}
132
133/*----------------------------------------------------------------------------
134 * ArcTdirSorter::qscmp -
135 * compare two axis monotone arcs that are incident
136 * to the line T == compare_value. Determine which of the
137 * two intersects that line with a LESSER S value. If
138 * jarc1 does, return 1. If jarc2 does, return -1.
139 *----------------------------------------------------------------------------
140 */
141int
142ArcTdirSorter::qscmp( char *i, char *j )
143{
144 Arc *jarc1 = *(Arc **) i;
145 Arc *jarc2 = *(Arc **) j;
146
147 int v1 = (jarc1->getitail() ? 0 : (jarc1->pwlArc->npts - 1));
148 int v2 = (jarc2->getitail() ? 0 : (jarc2->pwlArc->npts - 1));
149
150 REAL diff = jarc1->pwlArc->pts[v1].param[0] -
151 jarc2->pwlArc->pts[v2].param[0];
152
153 if( diff < 0.0)
154 return 1;
155 else if( diff > 0.0)
156 return -1;
157 else {
158 if( v1 == 0 ) {
159 if (jarc2->tail()[1] < jarc1->tail()[1]) {
160 return subdivider.ccwTurn_tl( jarc2, jarc1 ) ? 1 : -1;
161 } else {
162 return subdivider.ccwTurn_tr( jarc2, jarc1 ) ? -1 : 1;
163 }
164 } else {
165 if( jarc2->head()[1] < jarc1->head()[1] ) {
166 return subdivider.ccwTurn_tl( jarc1, jarc2 ) ? -1 : 1;
167 } else {
168 return subdivider.ccwTurn_tr( jarc1, jarc2 ) ? 1 : -1;
169 }
170 }
171 }
172}
173
174
175
176#endif /* __gluarcsorter_c_ */
Definition arc.h:55