ReactOS 0.4.15-dev-5666-gc548b97
curve.cc
Go to the documentation of this file.
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 * curve.c++
37 *
38 */
39
40//#include "glimports.h"
41//#include "myassert.h"
42//#include "mystdio.h"
43#include "mymath.h"
44#include "curve.h"
45#include "mapdesc.h"
46//#include "types.h"
47#include "quilt.h"
48//#include "nurbsconsts.h"
49
50/*--------------------------------------------------------------------------
51 * Curve::Curve - copy curve from quilt and transform control points
52 *--------------------------------------------------------------------------
53 */
54
55Curve::Curve( Quilt_ptr geo, REAL pta, REAL ptb, Curve *c )
56{
57 mapdesc = geo->mapdesc;
58 next = c;
61 order = geo->qspec[0].order;
63 for( int i = 0; i < MAXORDER * MAXCOORDS; i++ ) {
64 cpts[i] = 0;
65 spts[i] = 0;
66 }
67 stepsize = 0;
68 minstepsize = 0;
69
70 REAL *ps = geo->cpts;
71 Quiltspec_ptr qs = geo->qspec;
72 ps += qs->offset;
73 ps += qs->index * qs->order * qs->stride;
74
75 if( needsSampling )
76 mapdesc->xformSampling( ps, qs->order, qs->stride, spts, stride );
77
78 if( cullval == CULL_ACCEPT )
79 mapdesc->xformCulling( ps, qs->order, qs->stride, cpts, stride );
80
81 /* set untrimmed curve range */
82 range[0] = qs->breakpoints[qs->index];
83 range[1] = qs->breakpoints[qs->index+1];
84 range[2] = range[1] - range[0];
85
86 if( range[0] != pta ) {
87 Curve lower( *this, pta, 0 );
88 lower.next = next;
89 *this = lower;
90 }
91 if( range[1] != ptb ) {
92 Curve lower( *this, ptb, 0 );
93 }
94}
95
96/*--------------------------------------------------------------------------
97 * Curve::Curve - subdivide a curve along an isoparametric line
98 *--------------------------------------------------------------------------
99 */
100
102{
103 Curve &lower = *this;
104
105 lower.next = c;
106 lower.mapdesc = upper.mapdesc;
107 lower.needsSampling = upper.needsSampling;
108 lower.order = upper.order;
109 lower.stride = upper.stride;
110 lower.cullval = upper.cullval;
111
112 REAL d = (value - upper.range[0]) / upper.range[2];
113
114 if( needsSampling )
115 mapdesc->subdivide( upper.spts, lower.spts, d, upper.stride, upper.order );
116
117 if( cullval == CULL_ACCEPT )
118 mapdesc->subdivide( upper.cpts, lower.cpts, d, upper.stride, upper.order );
119
120 lower.range[0] = upper.range[0];
121 lower.range[1] = value;
122 lower.range[2] = value - upper.range[0];
123 upper.range[0] = value;
124 upper.range[2] = upper.range[1] - value;
125}
126
127
128/*--------------------------------------------------------------------------
129 * Curve::clamp - clamp the sampling rate to a given maximum
130 *--------------------------------------------------------------------------
131 */
132
133void
135{
136 if( stepsize < minstepsize )
138}
139
140void
142{
143 stepsize = ( max >= 1.0 ) ? (range[2] / max) : range[2];
145}
146
147void
149{
150 minstepsize= 0;
151
152 if( mapdesc->isConstantSampling() ) {
153 // fixed number of samples per patch in each direction
154 // maxrate is number of s samples per patch
156 } else if( mapdesc->isDomainSampling() ) {
157 // maxrate is number of s samples per unit s length of domain
159 } else {
160 // upper bound on path length between sample points
161
162 assert( order <= MAXORDER );
163
164 /* points have been transformed, therefore they are homogeneous */
165 REAL tmp[MAXORDER][MAXCOORDS];
166 const int tstride = sizeof(tmp[0]) / sizeof(REAL);
167 int val = mapdesc->project( spts, stride, &tmp[0][0], tstride, order );
168
169 if( val == 0 ) {
170 // control points cross infinity, therefore derivatives are undefined
172 } else {
175 REAL d = mapdesc->calcPartialVelocity( &tmp[0][0], tstride, order, 2, range[2] );
176 stepsize = (d > 0.0) ? sqrtf( 8.0 * t / d ) : range[2];
177 minstepsize = ( mapdesc->maxrate > 0.0 ) ? (range[2] / mapdesc->maxrate) : 0.0;
178 } else if( mapdesc->isPathLengthSampling() ) {
179 // t is upper bound on path (arc) length
180 REAL d = mapdesc->calcPartialVelocity( &tmp[0][0], tstride, order, 1, range[2] );
181 stepsize = ( d > 0.0 ) ? (t / d) : range[2];
182 minstepsize = ( mapdesc->maxrate > 0.0 ) ? (range[2] / mapdesc->maxrate) : 0.0;
183 } else {
184 // control points cross infinity, therefore partials are undefined
186 }
187 }
188 }
189}
190
191int
193{
194 return ( stepsize < minstepsize ) ? 1 : 0;
195}
196
197int
199{
200 if( cullval == CULL_ACCEPT )
202 return cullval;
203}
204
Definition: curve.h:46
REAL cpts[MAXORDER *MAXCOORDS]
Definition: curve.h:58
void setstepsize(REAL)
Definition: curve.cc:141
REAL range[3]
Definition: curve.h:62
int cullCheck(void)
Definition: curve.cc:198
void getstepsize(void)
Definition: curve.cc:148
REAL spts[MAXORDER *MAXCOORDS]
Definition: curve.h:59
int cullval
Definition: curve.h:56
int order
Definition: curve.h:55
REAL stepsize
Definition: curve.h:60
Curve(Quilt *, REAL, REAL, Curve *)
void clamp(void)
Definition: curve.cc:134
int needsSamplingSubdivision(void)
Definition: curve.cc:192
Mapdesc * mapdesc
Definition: curve.h:53
int needsSampling
Definition: curve.h:57
REAL minstepsize
Definition: curve.h:61
int stride
Definition: curve.h:54
Curve * next
Definition: curve.h:51
REAL calcPartialVelocity(REAL *, int, int, int, REAL)
Definition: mapdescv.cc:54
REAL clampfactor
Definition: mapdesc.h:107
void xformCulling(REAL *, int, int, REAL *, int)
Definition: mapdesc.cc:472
int isConstantSampling(void)
Definition: mapdesc.h:204
int isCulling(void)
Definition: mapdesc.h:261
void subdivide(REAL *, REAL *, REAL, int, int)
Definition: mapdesc.cc:577
REAL maxrate
Definition: mapdesc.h:109
int isDomainSampling(void)
Definition: mapdesc.h:210
int isParametricDistanceSampling(void)
Definition: mapdesc.h:216
int cullCheck(REAL *, int, int)
Definition: mapdesc.cc:425
int isRangeSampling(void)
Definition: mapdesc.h:246
REAL getProperty(long)
Definition: mapdesc.cc:769
int project(REAL *, int, REAL *, int, int)
Definition: mapdesc.cc:647
int isPathLengthSampling(void)
Definition: mapdesc.h:240
void xformSampling(REAL *, int, int, REAL *, int)
Definition: mapdesc.cc:454
#define MAXCOORDS
Definition: defines.h:48
#define CULL_TRIVIAL_ACCEPT
Definition: defines.h:41
#define MAXORDER
Definition: defines.h:45
#define CULL_ACCEPT
Definition: defines.h:42
float REAL
Definition: types.h:41
#define assert(x)
Definition: debug.h:53
GLdouble GLdouble t
Definition: gl.h:2047
GLsizei stride
Definition: glext.h:5848
const GLubyte * c
Definition: glext.h:8905
GLenum GLint * range
Definition: glext.h:7539
GLuint GLfloat * val
Definition: glext.h:7180
GLuint GLdouble GLdouble GLint GLint order
Definition: glext.h:11194
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
#define d
Definition: ke_i.h:81
#define c
Definition: ke_i.h:80
#define sqrtf(x)
Definition: mymath.h:59
#define N_PIXEL_TOLERANCE
Definition: nurbsconsts.h:89
class Quilt * Quilt_ptr
Definition: quilt.h:90
Knot * breakpoints
Definition: quilt.h:59
int index
Definition: quilt.h:56
int order
Definition: quilt.h:55
int stride
Definition: quilt.h:52
int offset
Definition: quilt.h:54
#define max(a, b)
Definition: svc.c:63
Definition: pdh_main.c:94