source: branches/swt/src/opengl/glu/tess/tess.h

Last change on this file was 3079, checked in by jeroen, 26 years ago

* empty log message *
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1/* $Id: tess.h,v 1.2 2000-03-11 09:05:04 jeroen Exp $ */
2/*
3** License Applicability. Except to the extent portions of this file are
4** made subject to an alternative license as permitted in the SGI Free
5** Software License B, Version 1.0 (the "License"), the contents of this
6** file are subject only to the provisions of the License. You may not use
7** this file except in compliance with the License. You may obtain a copy
8** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
9** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
10**
11** http://oss.sgi.com/projects/FreeB
12**
13** Note that, as provided in the License, the Software is distributed on an
14** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
15** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
16** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
17** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
18**
19** Original Code. The Original Code is: OpenGL Sample Implementation,
20** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
21** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
22** Copyright in any portions created by third parties is as indicated
23** elsewhere herein. All Rights Reserved.
24**
25** Additional Notice Provisions: The application programming interfaces
26** established by SGI in conjunction with the Original Code are The
27** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
28** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
29** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
30** Window System(R) (Version 1.3), released October 19, 1998. This software
31** was created using the OpenGL(R) version 1.2.1 Sample Implementation
32** published by SGI, but has not been independently verified as being
33** compliant with the OpenGL(R) version 1.2.1 Specification.
34**
35*/
36/*
37** Author: Eric Veach, July 1994.
38**
39** $Date: 2000-03-11 09:05:04 $ $Revision: 1.2 $
40** $Header: /home/ktk/tmp/odin/2007/netlabs.cvs/odin32/src/opengl/glu/tess/tess.h,v 1.2 2000-03-11 09:05:04 jeroen Exp $
41*/
42
43#ifndef __tess_h_
44#define __tess_h_
45
46#include "glu.h"
47#include <setjmp.h>
48#include "mesh.h"
49#include "dict.h"
50#include "priorityq.h"
51
52/* The begin/end calls must be properly nested. We keep track of
53 * the current state to enforce the ordering.
54 */
55enum TessState { T_DORMANT, T_IN_POLYGON, T_IN_CONTOUR };
56
57/* We cache vertex data for single-contour polygons so that we can
58 * try a quick-and-dirty decomposition first.
59 */
60#define TESS_MAX_CACHE 100
61
62typedef struct CachedVertex {
63 GLdouble coords[3];
64 void *data;
65} CachedVertex;
66
67struct GLUtesselator {
68
69 /*** state needed for collecting the input data ***/
70
71 enum TessState state; /* what begin/end calls have we seen? */
72
73 GLUhalfEdge *lastEdge; /* lastEdge->Org is the most recent vertex */
74 GLUmesh *mesh; /* stores the input contours, and eventually
75 the tessellation itself */
76
77 void (GLCALLBACK *callError)( GLenum errnum );
78
79 /*** state needed for projecting onto the sweep plane ***/
80
81 GLdouble normal[3]; /* user-specified normal (if provided) */
82 GLdouble sUnit[3]; /* unit vector in s-direction (debugging) */
83 GLdouble tUnit[3]; /* unit vector in t-direction (debugging) */
84
85 /*** state needed for the line sweep ***/
86
87 GLdouble relTolerance; /* tolerance for merging features */
88 GLenum windingRule; /* rule for determining polygon interior */
89 GLboolean fatalError; /* fatal error: needed combine callback */
90
91 Dict *dict; /* edge dictionary for sweep line */
92 PriorityQ *pq; /* priority queue of vertex events */
93 GLUvertex *event; /* current sweep event being processed */
94
95 void (GLCALLBACK *callCombine)( GLdouble coords[3], void *data[4],
96 GLfloat weight[4], void **outData );
97
98 /*** state needed for rendering callbacks (see render.c) ***/
99
100 GLboolean flagBoundary; /* mark boundary edges (use EdgeFlag)*/
101 GLboolean boundaryOnly; /* Extract contours, not triangles */
102 GLUface *lonelyTriList;
103 /* list of triangles which could not be rendered as strips or fans */
104
105 void (GLCALLBACK *callBegin)( GLenum type );
106 void (GLCALLBACK *callEdgeFlag)( GLboolean boundaryEdge );
107 void (GLCALLBACK *callVertex)( void *data );
108 void (GLCALLBACK *callEnd)( void );
109 void (GLCALLBACK *callMesh)( GLUmesh *mesh );
110
111
112 /*** state needed to cache single-contour polygons for renderCache() */
113
114 GLboolean emptyCache; /* empty cache on next vertex() call*/
115 int cacheCount; /* number of cached vertices */
116 CachedVertex cache[TESS_MAX_CACHE]; /* the vertex data */
117
118 /*** rendering callbacks that also pass polygon data ***/
119 void (GLCALLBACK *callBeginData)( GLenum type, void *polygonData );
120 void (GLCALLBACK *callEdgeFlagData)( GLboolean boundaryEdge,
121 void *polygonData );
122 void (GLCALLBACK *callVertexData)( void *data, void *polygonData );
123 void (GLCALLBACK *callEndData)( void *polygonData );
124 void (GLCALLBACK *callErrorData)( GLenum errnum, void *polygonData );
125 void (GLCALLBACK *callCombineData)( GLdouble coords[3], void *data[4],
126 GLfloat weight[4], void **outData,
127 void *polygonData );
128
129 jmp_buf env; /* place to jump to when memAllocs fail*/
130
131 void *polygonData; /* client data for current polygon*/
132};
133
134void GLCALLBACK __gl_noBeginData( GLenum type, void *polygonData );
135void GLCALLBACK __gl_noEdgeFlagData( GLboolean boundaryEdge, void *polygonData );
136void GLCALLBACK __gl_noVertexData( void *data, void *polygonData );
137void GLCALLBACK __gl_noEndData( void *polygonData );
138void GLCALLBACK __gl_noErrorData( GLenum errnum, void *polygonData );
139void GLCALLBACK __gl_noCombineData( GLdouble coords[3], void *data[4],
140 GLfloat weight[4], void **outData,
141 void *polygonData );
142
143#define CALL_BEGIN_OR_BEGIN_DATA(a) \
144 if (tess->callBeginData != &__gl_noBeginData) \
145 (*tess->callBeginData)((a),tess->polygonData); \
146 else (*tess->callBegin)((a));
147
148#define CALL_VERTEX_OR_VERTEX_DATA(a) \
149 if (tess->callVertexData != &__gl_noVertexData) \
150 (*tess->callVertexData)((a),tess->polygonData); \
151 else (*tess->callVertex)((a));
152
153#define CALL_EDGE_FLAG_OR_EDGE_FLAG_DATA(a) \
154 if (tess->callEdgeFlagData != &__gl_noEdgeFlagData) \
155 (*tess->callEdgeFlagData)((a),tess->polygonData); \
156 else (*tess->callEdgeFlag)((a));
157
158#define CALL_END_OR_END_DATA() \
159 if (tess->callEndData != &__gl_noEndData) \
160 (*tess->callEndData)(tess->polygonData); \
161 else (*tess->callEnd)();
162
163#define CALL_COMBINE_OR_COMBINE_DATA(a,b,c,d) \
164 if (tess->callCombineData != &__gl_noCombineData) \
165 (*tess->callCombineData)((a),(b),(c),(d),tess->polygonData); \
166 else (*tess->callCombine)((a),(b),(c),(d));
167
168#define CALL_ERROR_OR_ERROR_DATA(a) \
169 if (tess->callErrorData != &__gl_noErrorData) \
170 (*tess->callErrorData)((a),tess->polygonData); \
171 else (*tess->callError)((a));
172
173#endif
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