FreeWRL / FreeX3D 4.3.0
reader.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 * reader.c++
37 *
38 */
39
40#include <stdio.h>
41#include "glimports.h"
42#include "nurbsconsts.h"
43#include "reader.h"
44#include "trimvertex.h"
45#include "simplemath.h"
46
47//when read a pwlCurve, if two consecutive points are the same, then
48//eliminate one of them. This makes the tessellator more robust. The spec
49//assumes the application makes sure there are no redundant points.
50//but in Inspector, the trim curves seem to have redundant points a lot.
51//I guess other similar users may have the same problem.
52
53#define ELIMINATE_REDUNDANT_POINTS
54
55#ifdef ELIMINATE_REDUNDANT_POINTS
56#define equal(x,y) ( glu_abs(x-y) <= 0.00001)
57#endif
58
59#ifdef ELIMINATE_REDUNDANT_POINTS
60O_pwlcurve::O_pwlcurve( long _type, long count, INREAL *array, long byte_stride, TrimVertex *trimpts )
61{
62 next = 0;
63 used = 0;
64 owner = 0;
65 pts = trimpts;
66 npts = (int) count;
67 int i;
68
69 /* copy user data into internal trimming data structures */
70 switch( _type ) {
71 case N_P2D: {
72 TrimVertex *v = pts;
73 TrimVertex *prev = NULL;
74 int num = 0;
75 int doit;
76 for(i=0; i<count; i++) {
77 doit = 1;
78 if(prev != NULL)
79 {
80 if(equal(prev->param[0], array[0]) && equal(prev->param[1], array[1]))
81 {
82 doit = 0;
83 }
84 }
85
86 if(doit)
87 {
88 v->param[0] = (REAL) array[0];
89 v->param[1] = (REAL) array[1];
90 prev = v;
91 v++;
92 num++;
93 }
94 array = (INREAL *) (((char *) array) + byte_stride);
95 }
96 npts = num;
97 break;
98 }
99 case N_P2DR: {
100 TrimVertex *v = pts;
101 for( TrimVertex *lastv = v + count; v != lastv; v++ ) {
102 v->param[0] = (REAL) array[0] / (REAL) array[2];
103 v->param[1] = (REAL) array[1] / (REAL) array[2];
104 array = (INREAL *) (((char *) array) + byte_stride);
105 }
106 break;
107 }
108 }
109}
110#else
111O_pwlcurve::O_pwlcurve( long _type, long count, INREAL *array, long byte_stride, TrimVertex *trimpts )
112{
113 next = 0;
114 used = 0;
115 owner = 0;
116 pts = trimpts;
117 npts = (int) count;
118
119 /* copy user data into internal trimming data structures */
120 switch( _type ) {
121 case N_P2D: {
122 TrimVertex *v = pts;
123 for( TrimVertex *lastv = v + count; v != lastv; v++ ) {
124 v->param[0] = (REAL) array[0];
125 v->param[1] = (REAL) array[1];
126 array = (INREAL *) (((char *) array) + byte_stride);
127 }
128 break;
129 }
130 case N_P2DR: {
131 TrimVertex *v = pts;
132 for( TrimVertex *lastv = v + count; v != lastv; v++ ) {
133 v->param[0] = (REAL) array[0] / (REAL) array[2];
134 v->param[1] = (REAL) array[1] / (REAL) array[2];
135 array = (INREAL *) (((char *) array) + byte_stride);
136 }
137 break;
138 }
139 }
140}
141#endif
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