diff options
Diffstat (limited to 'src/glu/sgi/libtess/tess.h')
| -rw-r--r-- | src/glu/sgi/libtess/tess.h | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/src/glu/sgi/libtess/tess.h b/src/glu/sgi/libtess/tess.h new file mode 100644 index 00000000000..f5f11f5a929 --- /dev/null +++ b/src/glu/sgi/libtess/tess.h @@ -0,0 +1,172 @@ +/* +** License Applicability. Except to the extent portions of this file are +** made subject to an alternative license as permitted in the SGI Free +** Software License B, Version 1.1 (the "License"), the contents of this +** file are subject only to the provisions of the License. You may not use +** this file except in compliance with the License. You may obtain a copy +** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 +** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: +** +** http://oss.sgi.com/projects/FreeB +** +** Note that, as provided in the License, the Software is distributed on an +** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS +** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND +** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A +** PARTICULAR PURPOSE, AND NON-INFRINGEMENT. +** +** Original Code. The Original Code is: OpenGL Sample Implementation, +** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, +** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. +** Copyright in any portions created by third parties is as indicated +** elsewhere herein. All Rights Reserved. +** +** Additional Notice Provisions: The application programming interfaces +** established by SGI in conjunction with the Original Code are The +** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released +** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version +** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X +** Window System(R) (Version 1.3), released October 19, 1998. This software +** was created using the OpenGL(R) version 1.2.1 Sample Implementation +** published by SGI, but has not been independently verified as being +** compliant with the OpenGL(R) version 1.2.1 Specification. +** +*/ +/* +** Author: Eric Veach, July 1994. +** +** $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $ +** $Header: /cvs/mesa/Mesa/src/glu/sgi/libtess/tess.h,v 1.1 2001/03/17 00:25:41 brianp Exp $ +*/ + +#ifndef __tess_h_ +#define __tess_h_ + +#include <GL/glu.h> +#include <setjmp.h> +#include "mesh.h" +#include "dict.h" +#include "priorityq.h" + +/* The begin/end calls must be properly nested. We keep track of + * the current state to enforce the ordering. + */ +enum TessState { T_DORMANT, T_IN_POLYGON, T_IN_CONTOUR }; + +/* We cache vertex data for single-contour polygons so that we can + * try a quick-and-dirty decomposition first. + */ +#define TESS_MAX_CACHE 100 + +typedef struct CachedVertex { + GLdouble coords[3]; + void *data; +} CachedVertex; + +struct GLUtesselator { + + /*** state needed for collecting the input data ***/ + + enum TessState state; /* what begin/end calls have we seen? */ + + GLUhalfEdge *lastEdge; /* lastEdge->Org is the most recent vertex */ + GLUmesh *mesh; /* stores the input contours, and eventually + the tessellation itself */ + + void (GLAPIENTRY *callError)( GLenum errnum ); + + /*** state needed for projecting onto the sweep plane ***/ + + GLdouble normal[3]; /* user-specified normal (if provided) */ + GLdouble sUnit[3]; /* unit vector in s-direction (debugging) */ + GLdouble tUnit[3]; /* unit vector in t-direction (debugging) */ + + /*** state needed for the line sweep ***/ + + GLdouble relTolerance; /* tolerance for merging features */ + GLenum windingRule; /* rule for determining polygon interior */ + GLboolean fatalError; /* fatal error: needed combine callback */ + + Dict *dict; /* edge dictionary for sweep line */ + PriorityQ *pq; /* priority queue of vertex events */ + GLUvertex *event; /* current sweep event being processed */ + + void (GLAPIENTRY *callCombine)( GLdouble coords[3], void *data[4], + GLfloat weight[4], void **outData ); + + /*** state needed for rendering callbacks (see render.c) ***/ + + GLboolean flagBoundary; /* mark boundary edges (use EdgeFlag) */ + GLboolean boundaryOnly; /* Extract contours, not triangles */ + GLUface *lonelyTriList; + /* list of triangles which could not be rendered as strips or fans */ + + void (GLAPIENTRY *callBegin)( GLenum type ); + void (GLAPIENTRY *callEdgeFlag)( GLboolean boundaryEdge ); + void (GLAPIENTRY *callVertex)( void *data ); + void (GLAPIENTRY *callEnd)( void ); + void (GLAPIENTRY *callMesh)( GLUmesh *mesh ); + + + /*** state needed to cache single-contour polygons for renderCache() */ + + GLboolean emptyCache; /* empty cache on next vertex() call */ + int cacheCount; /* number of cached vertices */ + CachedVertex cache[TESS_MAX_CACHE]; /* the vertex data */ + + /*** rendering callbacks that also pass polygon data ***/ + void (GLAPIENTRY *callBeginData)( GLenum type, void *polygonData ); + void (GLAPIENTRY *callEdgeFlagData)( GLboolean boundaryEdge, + void *polygonData ); + void (GLAPIENTRY *callVertexData)( void *data, void *polygonData ); + void (GLAPIENTRY *callEndData)( void *polygonData ); + void (GLAPIENTRY *callErrorData)( GLenum errnum, void *polygonData ); + void (GLAPIENTRY *callCombineData)( GLdouble coords[3], void *data[4], + GLfloat weight[4], void **outData, + void *polygonData ); + + jmp_buf env; /* place to jump to when memAllocs fail */ + + void *polygonData; /* client data for current polygon */ +}; + +void GLAPIENTRY __gl_noBeginData( GLenum type, void *polygonData ); +void GLAPIENTRY __gl_noEdgeFlagData( GLboolean boundaryEdge, void *polygonData ); +void GLAPIENTRY __gl_noVertexData( void *data, void *polygonData ); +void GLAPIENTRY __gl_noEndData( void *polygonData ); +void GLAPIENTRY __gl_noErrorData( GLenum errnum, void *polygonData ); +void GLAPIENTRY __gl_noCombineData( GLdouble coords[3], void *data[4], + GLfloat weight[4], void **outData, + void *polygonData ); + +#define CALL_BEGIN_OR_BEGIN_DATA(a) \ + if (tess->callBeginData != &__gl_noBeginData) \ + (*tess->callBeginData)((a),tess->polygonData); \ + else (*tess->callBegin)((a)); + +#define CALL_VERTEX_OR_VERTEX_DATA(a) \ + if (tess->callVertexData != &__gl_noVertexData) \ + (*tess->callVertexData)((a),tess->polygonData); \ + else (*tess->callVertex)((a)); + +#define CALL_EDGE_FLAG_OR_EDGE_FLAG_DATA(a) \ + if (tess->callEdgeFlagData != &__gl_noEdgeFlagData) \ + (*tess->callEdgeFlagData)((a),tess->polygonData); \ + else (*tess->callEdgeFlag)((a)); + +#define CALL_END_OR_END_DATA() \ + if (tess->callEndData != &__gl_noEndData) \ + (*tess->callEndData)(tess->polygonData); \ + else (*tess->callEnd)(); + +#define CALL_COMBINE_OR_COMBINE_DATA(a,b,c,d) \ + if (tess->callCombineData != &__gl_noCombineData) \ + (*tess->callCombineData)((a),(b),(c),(d),tess->polygonData); \ + else (*tess->callCombine)((a),(b),(c),(d)); + +#define CALL_ERROR_OR_ERROR_DATA(a) \ + if (tess->callErrorData != &__gl_noErrorData) \ + (*tess->callErrorData)((a),tess->polygonData); \ + else (*tess->callError)((a)); + +#endif |