1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
/*
** 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.
*/
/*
* reader.c++
*
* $Date: 2002/11/01 23:35:07 $ $Revision: 1.2 $
* $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/reader.cc,v 1.2 2002/11/01 23:35:07 brianp Exp $
*/
#include <stdio.h>
#include "glimports.h"
#include "nurbsconsts.h"
#include "reader.h"
#include "trimvertex.h"
#include "simplemath.h"
//when read a pwlCurve, if two consecutive points are the same, then
//eliminate one of them. This makes the tessellator more robust. The spec
//assumes the application makes sure there are no redundant points.
//but in Inspector, the trim curves seem to have redundant points a lot.
//I guess other similar users may have the same problem.
#define ELIMINATE_REDUNDANT_POINTS
#ifdef ELIMINATE_REDUNDANT_POINTS
#define equal(x,y) ( glu_abs(x-y) <= 0.00001)
#endif
#ifdef ELIMINATE_REDUNDANT_POINTS
O_pwlcurve::O_pwlcurve( long _type, long count, INREAL *array, long byte_stride, TrimVertex *trimpts )
{
next = 0;
used = 0;
owner = 0;
pts = trimpts;
npts = (int) count;
int i;
/* copy user data into internal trimming data structures */
switch( _type ) {
case N_P2D: {
TrimVertex *v = pts;
TrimVertex *prev = NULL;
int num = 0;
int doit;
for(i=0; i<count; i++) {
doit = 1;
if(prev != NULL)
{
if(equal(prev->param[0], array[0]) && equal(prev->param[1], array[1]))
{
doit = 0;
}
}
if(doit)
{
v->param[0] = (REAL) array[0];
v->param[1] = (REAL) array[1];
prev = v;
v++;
num++;
}
array = (INREAL *) (((char *) array) + byte_stride);
}
npts = num;
break;
}
case N_P2DR: {
TrimVertex *v = pts;
for( TrimVertex *lastv = v + count; v != lastv; v++ ) {
v->param[0] = (REAL) array[0] / (REAL) array[2];
v->param[1] = (REAL) array[1] / (REAL) array[2];
array = (INREAL *) (((char *) array) + byte_stride);
}
break;
}
}
}
#else
O_pwlcurve::O_pwlcurve( long _type, long count, INREAL *array, long byte_stride, TrimVertex *trimpts )
{
next = 0;
used = 0;
owner = 0;
pts = trimpts;
npts = (int) count;
/* copy user data into internal trimming data structures */
switch( _type ) {
case N_P2D: {
TrimVertex *v = pts;
for( TrimVertex *lastv = v + count; v != lastv; v++ ) {
v->param[0] = (REAL) array[0];
v->param[1] = (REAL) array[1];
array = (INREAL *) (((char *) array) + byte_stride);
}
break;
}
case N_P2DR: {
TrimVertex *v = pts;
for( TrimVertex *lastv = v + count; v != lastv; v++ ) {
v->param[0] = (REAL) array[0] / (REAL) array[2];
v->param[1] = (REAL) array[1] / (REAL) array[2];
array = (INREAL *) (((char *) array) + byte_stride);
}
break;
}
}
}
#endif
|
