Warning, /include/Geant4/tools/glutess/_tess is written in an unsupported language. File is not indexed.
0001 // see license file for original license.
0002
0003 #ifndef tools_glutess__tess
0004 #define tools_glutess__tess
0005
0006 #include "mesh"
0007 #include "dict"
0008 #include "priorityq"
0009
0010 #include <csetjmp>
0011
0012 /* The begin/end calls must be properly nested. We keep track of
0013 * the current state to enforce the ordering.
0014 */
0015 enum TessState { T_DORMANT, T_IN_POLYGON, T_IN_CONTOUR };
0016
0017 /* We cache vertex data for single-contour polygons so that we can
0018 * try a quick-and-dirty decomposition first.
0019 */
0020 #define GLU_TESS_MAX_CACHE 100
0021
0022 typedef struct CachedVertex {
0023 GLUdouble coords[3];
0024 void *data;
0025 } CachedVertex;
0026
0027 struct GLUtesselator {
0028
0029 /*** state needed for collecting the input data ***/
0030
0031 enum TessState state; /* what begin/end calls have we seen? */
0032
0033 GLUhalfEdge *lastEdge; /* lastEdge->Org is the most recent vertex */
0034 GLUmesh *mesh; /* stores the input contours, and eventually
0035 the tessellation itself */
0036
0037 void (GLUAPIENTRY *callError)( GLUenum errnum );
0038
0039 /*** state needed for projecting onto the sweep plane ***/
0040
0041 GLUdouble normal[3]; /* user-specified normal (if provided) */
0042 GLUdouble sUnit[3]; /* unit vector in s-direction (debugging) */
0043 GLUdouble tUnit[3]; /* unit vector in t-direction (debugging) */
0044
0045 /*** state needed for the line sweep ***/
0046
0047 GLUdouble relTolerance; /* tolerance for merging features */
0048 GLUenum windingRule; /* rule for determining polygon interior */
0049 GLUboolean fatalError; /* fatal error: needed combine callback */
0050
0051 Dict *dict; /* edge dictionary for sweep line */
0052 PriorityQ *pq; /* priority queue of vertex events */
0053 GLUvertex *event; /* current sweep event being processed */
0054
0055 void (GLUAPIENTRY *callCombine)( GLUdouble coords[3], void *data[4],
0056 GLUfloat weight[4], void **outData );
0057
0058 /*** state needed for rendering callbacks (see render.c) ***/
0059
0060 GLUboolean flagBoundary; /* mark boundary edges (use EdgeFlag) */
0061 GLUboolean boundaryOnly; /* Extract contours, not triangles */
0062 GLUface *lonelyTriList;
0063 /* list of triangles which could not be rendered as strips or fans */
0064
0065 void (GLUAPIENTRY *callBegin)( GLUenum type );
0066 void (GLUAPIENTRY *callEdgeFlag)( GLUboolean boundaryEdge );
0067 void (GLUAPIENTRY *callVertex)( void *data );
0068 void (GLUAPIENTRY *callEnd)( void );
0069 void (GLUAPIENTRY *callMesh)( GLUmesh *mesh );
0070
0071
0072 /*** state needed to cache single-contour polygons for renderCache() */
0073
0074 GLUboolean emptyCache; /* empty cache on next vertex() call */
0075 int cacheCount; /* number of cached vertices */
0076 CachedVertex cache[GLU_TESS_MAX_CACHE]; /* the vertex data */
0077
0078 /*** rendering callbacks that also pass polygon data ***/
0079 void (GLUAPIENTRY *callBeginData)( GLUenum type, void *polygonData );
0080 void (GLUAPIENTRY *callEdgeFlagData)( GLUboolean boundaryEdge,
0081 void *polygonData );
0082 void (GLUAPIENTRY *callVertexData)( void *data, void *polygonData );
0083 void (GLUAPIENTRY *callEndData)( void *polygonData );
0084 void (GLUAPIENTRY *callErrorData)( GLUenum errnum, void *polygonData );
0085 void (GLUAPIENTRY *callCombineData)( GLUdouble coords[3], void *data[4],
0086 GLUfloat weight[4], void **outData,
0087 void *polygonData );
0088
0089 jmp_buf env; /* place to jump to when memAllocs fail */
0090
0091 void *polygonData; /* client data for current polygon */
0092 };
0093
0094 void GLUAPIENTRY __gl_noBeginData( GLUenum type, void *polygonData );
0095 void GLUAPIENTRY __gl_noEdgeFlagData( GLUboolean boundaryEdge, void *polygonData );
0096 void GLUAPIENTRY __gl_noVertexData( void *data, void *polygonData );
0097 void GLUAPIENTRY __gl_noEndData( void *polygonData );
0098 void GLUAPIENTRY __gl_noErrorData( GLUenum errnum, void *polygonData );
0099 void GLUAPIENTRY __gl_noCombineData( GLUdouble coords[3], void *data[4],
0100 GLUfloat weight[4], void **outData,
0101 void *polygonData );
0102
0103 #define CALL_BEGIN_OR_BEGIN_DATA(a) \
0104 if (tess->callBeginData != &__gl_noBeginData) \
0105 (*tess->callBeginData)((a),tess->polygonData); \
0106 else (*tess->callBegin)((a));
0107
0108 #define CALL_VERTEX_OR_VERTEX_DATA(a) \
0109 if (tess->callVertexData != &__gl_noVertexData) \
0110 (*tess->callVertexData)((a),tess->polygonData); \
0111 else (*tess->callVertex)((a));
0112
0113 #define CALL_EDGE_FLAG_OR_EDGE_FLAG_DATA(a) \
0114 if (tess->callEdgeFlagData != &__gl_noEdgeFlagData) \
0115 (*tess->callEdgeFlagData)((a),tess->polygonData); \
0116 else (*tess->callEdgeFlag)((a));
0117
0118 #define CALL_END_OR_END_DATA() \
0119 if (tess->callEndData != &__gl_noEndData) \
0120 (*tess->callEndData)(tess->polygonData); \
0121 else (*tess->callEnd)();
0122
0123 #define CALL_COMBINE_OR_COMBINE_DATA(a,b,c,d) \
0124 if (tess->callCombineData != &__gl_noCombineData) \
0125 (*tess->callCombineData)((a),(b),(c),(d),tess->polygonData); \
0126 else (*tess->callCombine)((a),(b),(c),(d));
0127
0128 #define CALL_ERROR_OR_ERROR_DATA(a) \
0129 if (tess->callErrorData != &__gl_noErrorData) \
0130 (*tess->callErrorData)((a),tess->polygonData); \
0131 else (*tess->callError)((a));
0132
0133 #endif
