Logo ROOT  
Reference Guide
tess.h
Go to the documentation of this file.
1/*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice including the dates of first publication and
13 * either this permission notice or a reference to
14 * http://oss.sgi.com/projects/FreeB/
15 * shall be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
22 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Except as contained in this notice, the name of Silicon Graphics, Inc.
26 * shall not be used in advertising or otherwise to promote the sale, use or
27 * other dealings in this Software without prior written authorization from
28 * Silicon Graphics, Inc.
29 */
30/*
31** Author: Eric Veach, July 1994.
32**
33*/
34
35#ifndef __tess_h_
36#define __tess_h_
37
38#include "GL_glu.h"
39#include <setjmp.h>
40#include "mesh.h"
41#include "dict.h"
42#include "priorityq.h"
43
44/* The begin/end calls must be properly nested. We keep track of
45 * the current state to enforce the ordering.
46 */
48
49/* We cache vertex data for single-contour polygons so that we can
50 * try a quick-and-dirty decomposition first.
51 */
52#define TESS_MAX_CACHE 100
53
54typedef struct CachedVertex {
56 void *data;
58
60
61 /*** state needed for collecting the input data ***/
62
63 enum TessState state; /* what begin/end calls have we seen? */
64
65 GLUhalfEdge *lastEdge; /* lastEdge->Org is the most recent vertex */
66 GLUmesh *mesh; /* stores the input contours, and eventually
67 the tessellation itself */
68
69 void (GLAPIENTRY *callError)( GLenum errnum );
70
71 /*** state needed for projecting onto the sweep plane ***/
72
73 GLdouble normal[3]; /* user-specified normal (if provided) */
74 GLdouble sUnit[3]; /* unit vector in s-direction (debugging) */
75 GLdouble tUnit[3]; /* unit vector in t-direction (debugging) */
76
77 /*** state needed for the line sweep ***/
78
79 GLdouble relTolerance; /* tolerance for merging features */
80 GLenum windingRule; /* rule for determining polygon interior */
81 GLboolean fatalError; /* fatal error: needed combine callback */
82
83 Dict *dict; /* edge dictionary for sweep line */
84 PriorityQ *pq; /* priority queue of vertex events */
85 GLUvertex *event; /* current sweep event being processed */
86
87 void (GLAPIENTRY *callCombine)( GLdouble coords[3], void *data[4],
88 GLfloat weight[4], void **outData );
89
90 /*** state needed for rendering callbacks (see render.c) ***/
91
92 GLboolean flagBoundary; /* mark boundary edges (use EdgeFlag) */
93 GLboolean boundaryOnly; /* Extract contours, not triangles */
95 /* list of triangles which could not be rendered as strips or fans */
96
97 void (GLAPIENTRY *callBegin)( GLenum type );
98 void (GLAPIENTRY *callEdgeFlag)( GLboolean boundaryEdge );
99 void (GLAPIENTRY *callVertex)( void *data );
100 void (GLAPIENTRY *callEnd)( void );
101 void (GLAPIENTRY *callMesh)( GLUmesh *mesh );
102
103
104 /*** state needed to cache single-contour polygons for renderCache() */
105
106 GLboolean emptyCache; /* empty cache on next vertex() call */
107 int cacheCount; /* number of cached vertices */
108 CachedVertex cache[TESS_MAX_CACHE]; /* the vertex data */
109
110 /*** rendering callbacks that also pass polygon data ***/
111 void (GLAPIENTRY *callBeginData)( GLenum type, void *polygonData );
112 void (GLAPIENTRY *callEdgeFlagData)( GLboolean boundaryEdge,
113 void *polygonData );
114 void (GLAPIENTRY *callVertexData)( void *data, void *polygonData );
115 void (GLAPIENTRY *callEndData)( void *polygonData );
116 void (GLAPIENTRY *callErrorData)( GLenum errnum, void *polygonData );
117 void (GLAPIENTRY *callCombineData)( GLdouble coords[3], void *data[4],
118 GLfloat weight[4], void **outData,
119 void *polygonData );
120
121 jmp_buf env; /* place to jump to when memAllocs fail */
122
123 void *polygonData; /* client data for current polygon */
124};
125
126void GLAPIENTRY __gl_noBeginData( GLenum type, void *polygonData );
127void GLAPIENTRY __gl_noEdgeFlagData( GLboolean boundaryEdge, void *polygonData );
128void GLAPIENTRY __gl_noVertexData( void *data, void *polygonData );
129void GLAPIENTRY __gl_noEndData( void *polygonData );
130void GLAPIENTRY __gl_noErrorData( GLenum errnum, void *polygonData );
131void GLAPIENTRY __gl_noCombineData( GLdouble coords[3], void *data[4],
132 GLfloat weight[4], void **outData,
133 void *polygonData );
134
135#define CALL_BEGIN_OR_BEGIN_DATA(a) \
136 if (tess->callBeginData != &__gl_noBeginData) \
137 (*tess->callBeginData)((a),tess->polygonData); \
138 else (*tess->callBegin)((a));
139
140#define CALL_VERTEX_OR_VERTEX_DATA(a) \
141 if (tess->callVertexData != &__gl_noVertexData) \
142 (*tess->callVertexData)((a),tess->polygonData); \
143 else (*tess->callVertex)((a));
144
145#define CALL_EDGE_FLAG_OR_EDGE_FLAG_DATA(a) \
146 if (tess->callEdgeFlagData != &__gl_noEdgeFlagData) \
147 (*tess->callEdgeFlagData)((a),tess->polygonData); \
148 else (*tess->callEdgeFlag)((a));
149
150#define CALL_END_OR_END_DATA() \
151 if (tess->callEndData != &__gl_noEndData) \
152 (*tess->callEndData)(tess->polygonData); \
153 else (*tess->callEnd)();
154
155#define CALL_COMBINE_OR_COMBINE_DATA(a,b,c,d) \
156 if (tess->callCombineData != &__gl_noCombineData) \
157 (*tess->callCombineData)((a),(b),(c),(d),tess->polygonData); \
158 else (*tess->callCombine)((a),(b),(c),(d));
159
160#define CALL_ERROR_OR_ERROR_DATA(a) \
161 if (tess->callErrorData != &__gl_noErrorData) \
162 (*tess->callErrorData)((a),tess->polygonData); \
163 else (*tess->callError)((a));
164
165#endif
float GLfloat
Definition: GL_glu.h:277
double GLdouble
Definition: GL_glu.h:279
unsigned int GLenum
Definition: GL_glu.h:266
unsigned char GLboolean
Definition: GL_glu.h:267
#define GLAPIENTRY
Definition: GL_glu.h:46
int type
Definition: TGX11.cxx:121
void * data
Definition: tess.h:56
GLdouble coords[3]
Definition: tess.h:55
Definition: dict-list.h:94
Definition: mesh.h:126
Definition: mesh.h:168
PriorityQ * pq
Definition: tess.h:84
void(GLAPIENTRY *callVertex)(void *data)
GLUvertex * event
Definition: tess.h:85
void(GLAPIENTRY *callVertexData)(void *data
GLboolean flagBoundary
Definition: tess.h:92
void(GLAPIENTRY *callEdgeFlagData)(GLboolean boundaryEdge
int cacheCount
Definition: tess.h:107
void(GLAPIENTRY *callErrorData)(GLenum errnum
GLdouble tUnit[3]
Definition: tess.h:75
GLUhalfEdge * lastEdge
Definition: tess.h:65
GLboolean emptyCache
Definition: tess.h:106
void(GLAPIENTRY *callEdgeFlag)(GLboolean boundaryEdge)
enum TessState state
Definition: tess.h:63
void(GLAPIENTRY *callBegin)(GLenum type)
GLdouble sUnit[3]
Definition: tess.h:74
GLdouble normal[3]
Definition: tess.h:73
void(GLAPIENTRY *callMesh)(GLUmesh *mesh)
GLboolean boundaryOnly
Definition: tess.h:93
void * data[4]
Definition: tess.h:87
GLdouble relTolerance
Definition: tess.h:79
GLenum windingRule
Definition: tess.h:80
void(GLAPIENTRY *callEndData)(void *polygonData)
void(GLAPIENTRY *callError)(GLenum errnum)
void GLfloat void ** outData
Definition: tess.h:88
GLboolean fatalError
Definition: tess.h:81
GLUface * lonelyTriList
Definition: tess.h:94
GLUmesh * mesh
Definition: tess.h:66
void GLfloat void void * polygonData
Definition: tess.h:119
void * polygonData
Definition: tess.h:111
Dict * dict
Definition: tess.h:83
jmp_buf env
Definition: tess.h:121
void(GLAPIENTRY *callCombineData)(GLdouble coords[3]
CachedVertex cache[TESS_MAX_CACHE]
Definition: tess.h:108
void GLfloat weight[4]
Definition: tess.h:88
void(GLAPIENTRY *callEnd)(void)
void GLAPIENTRY __gl_noErrorData(GLenum errnum, void *polygonData)
Definition: tess.c:80
TessState
Definition: tess.h:47
@ T_IN_CONTOUR
Definition: tess.h:47
@ T_IN_POLYGON
Definition: tess.h:47
@ T_DORMANT
Definition: tess.h:47
void GLAPIENTRY __gl_noEdgeFlagData(GLboolean boundaryEdge, void *polygonData)
Definition: tess.c:75
struct CachedVertex CachedVertex
void GLAPIENTRY __gl_noEndData(void *polygonData)
Definition: tess.c:79
#define TESS_MAX_CACHE
Definition: tess.h:52
void GLAPIENTRY __gl_noVertexData(void *data, void *polygonData)
Definition: tess.c:77
void GLAPIENTRY __gl_noCombineData(GLdouble coords[3], void *data[4], GLfloat weight[4], void **outData, void *polygonData)
Definition: tess.c:82
void GLAPIENTRY __gl_noBeginData(GLenum type, void *polygonData)
Definition: tess.c:73