Kstars

src/tess.h
1/*
2** Author: Eric Veach, July 1994.
3**
4*/
5
6#ifndef __tess_h_
7#define __tess_h_
8
9#include "glu.h"
10#include <setjmp.h>
11#include "mesh.h"
12#include "dict.h"
13#include "priorityq.h"
14
15/* The begin/end calls must be properly nested. We keep track of
16 * the current state to enforce the ordering.
17 */
18enum TessState
19{
20 T_DORMANT,
21 T_IN_POLYGON,
22 T_IN_CONTOUR
23};
24
25/* We cache vertex data for single-contour polygons so that we can
26 * try a quick-and-dirty decomposition first.
27 */
28#define TESS_MAX_CACHE 100
29
30typedef struct CachedVertex
31{
32 GLdouble coords[3];
33 void *data;
34} CachedVertex;
35
36struct GLUtesselator
37{
38 /*** state needed for collecting the input data ***/
39
40 enum TessState state; /* what begin/end calls have we seen? */
41
42 GLUhalfEdge *lastEdge; /* lastEdge->Org is the most recent vertex */
43 GLUmesh *mesh; /* stores the input contours, and eventually
44 the tessellation itself */
45
46 void(GLAPIENTRY *callError)(GLenum errnum);
47
48 /*** state needed for projecting onto the sweep plane ***/
49
50 GLdouble normal[3]; /* user-specified normal (if provided) */
51 GLdouble sUnit[3]; /* unit vector in s-direction (debugging) */
52 GLdouble tUnit[3]; /* unit vector in t-direction (debugging) */
53
54 /*** state needed for the line sweep ***/
55
56 GLdouble relTolerance; /* tolerance for merging features */
57 GLenum windingRule; /* rule for determining polygon interior */
58 GLboolean fatalError; /* fatal error: needed combine callback */
59
60 Dict *dict; /* edge dictionary for sweep line */
61 PriorityQ *pq; /* priority queue of vertex events */
62 GLUvertex *event; /* current sweep event being processed */
63
64 void(GLAPIENTRY *callCombine)(GLdouble coords[3], void *data[4], GLfloat weight[4], void **outData);
65
66 /*** state needed for rendering callbacks (see render.c) ***/
67
68 GLboolean flagBoundary; /* mark boundary edges (use EdgeFlag) */
69 GLboolean boundaryOnly; /* Extract contours, not triangles */
70 GLUface *lonelyTriList;
71 /* list of triangles which could not be rendered as strips or fans */
72
73 void(GLAPIENTRY *callBegin)(GLenum type);
74 void(GLAPIENTRY *callEdgeFlag)(GLboolean boundaryEdge);
75 void(GLAPIENTRY *callVertex)(void *data);
76 void(GLAPIENTRY *callEnd)(void);
77 void(GLAPIENTRY *callMesh)(GLUmesh *mesh);
78
79 /*** state needed to cache single-contour polygons for renderCache() */
80
81 GLboolean emptyCache; /* empty cache on next vertex() call */
82 int cacheCount; /* number of cached vertices */
83 CachedVertex cache[TESS_MAX_CACHE]; /* the vertex data */
84
85 /*** rendering callbacks that also pass polygon data ***/
86 void(GLAPIENTRY *callBeginData)(GLenum type, void *polygonData);
87 void(GLAPIENTRY *callEdgeFlagData)(GLboolean boundaryEdge, void *polygonData);
88 void(GLAPIENTRY *callVertexData)(void *data, void *polygonData);
89 void(GLAPIENTRY *callEndData)(void *polygonData);
90 void(GLAPIENTRY *callErrorData)(GLenum errnum, void *polygonData);
91 void(GLAPIENTRY *callCombineData)(GLdouble coords[3], void *data[4], GLfloat weight[4], void **outData,
92 void *polygonData);
93
94 jmp_buf env; /* place to jump to when memAllocs fail */
95
96 void *polygonData; /* client data for current polygon */
97};
98
99void GLAPIENTRY __gl_noBeginData(GLenum type, void *polygonData);
100void GLAPIENTRY __gl_noEdgeFlagData(GLboolean boundaryEdge, void *polygonData);
101void GLAPIENTRY __gl_noVertexData(void *data, void *polygonData);
102void GLAPIENTRY __gl_noEndData(void *polygonData);
103void GLAPIENTRY __gl_noErrorData(GLenum errnum, void *polygonData);
104void GLAPIENTRY __gl_noCombineData(GLdouble coords[3], void *data[4], GLfloat weight[4], void **outData,
105 void *polygonData);
106
107#define CALL_BEGIN_OR_BEGIN_DATA(a) \
108 if (tess->callBeginData != &__gl_noBeginData) \
109 (*tess->callBeginData)((a), tess->polygonData); \
110 else \
111 (*tess->callBegin)((a));
112
113#define CALL_VERTEX_OR_VERTEX_DATA(a) \
114 if (tess->callVertexData != &__gl_noVertexData) \
115 (*tess->callVertexData)((a), tess->polygonData); \
116 else \
117 (*tess->callVertex)((a));
118
119#define CALL_EDGE_FLAG_OR_EDGE_FLAG_DATA(a) \
120 if (tess->callEdgeFlagData != &__gl_noEdgeFlagData) \
121 (*tess->callEdgeFlagData)((a), tess->polygonData); \
122 else \
123 (*tess->callEdgeFlag)((a));
124
125#define CALL_END_OR_END_DATA() \
126 if (tess->callEndData != &__gl_noEndData) \
127 (*tess->callEndData)(tess->polygonData); \
128 else \
129 (*tess->callEnd)();
130
131#define CALL_COMBINE_OR_COMBINE_DATA(a, b, c, d) \
132 if (tess->callCombineData != &__gl_noCombineData) \
133 (*tess->callCombineData)((a), (b), (c), (d), tess->polygonData); \
134 else \
135 (*tess->callCombine)((a), (b), (c), (d));
136
137#define CALL_ERROR_OR_ERROR_DATA(a) \
138 if (tess->callErrorData != &__gl_noErrorData) \
139 (*tess->callErrorData)((a), tess->polygonData); \
140 else \
141 (*tess->callError)((a));
142
143#endif
Type type(const QSqlDatabase &db)
This file is part of the KDE documentation.
Documentation copyright © 1996-2024 The KDE developers.
Generated on Fri May 17 2024 11:48:27 by doxygen 1.10.0 written by Dimitri van Heesch, © 1997-2006

KDE's Doxygen guidelines are available online.