629 lines
17 KiB
C
629 lines
17 KiB
C
/*
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** Copyright 1994, Silicon Graphics, Inc.
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** All Rights Reserved.
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**
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** This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics, Inc.;
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** the contents of this file may not be disclosed to third parties, copied or
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** duplicated in any form, in whole or in part, without the prior written
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** permission of Silicon Graphics, Inc.
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**
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** RESTRICTED RIGHTS LEGEND:
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** Use, duplication or disclosure by the Government is subject to restrictions
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** as set forth in subdivision (c)(1)(ii) of the Rights in Technical Data
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** and Computer Software clause at DFARS 252.227-7013, and/or in similar or
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** successor clauses in the FAR, DOD or NASA FAR Supplement. Unpublished -
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** rights reserved under the Copyright Laws of the United States.
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**
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** Author: Eric Veach, July 1994.
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*/
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#include <assert.h>
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#include "memalloc.h"
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#include "tess.h"
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#include "mesh.h"
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#include "normal.h"
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#include "sweep.h"
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#include "tessmono.h"
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#include "render.h"
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#define GLU_TESS_DEFAULT_TOLERANCE 0.0
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#ifndef NT
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#define GLU_TESS_MESH 100112 /* void (*)(GLUmesh *mesh) */
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#endif
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#define TRUE 1
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#define FALSE 0
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/*ARGSUSED*/ static void noBegin( GLenum type ) {}
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/*ARGSUSED*/ static void noEdgeFlag( GLboolean boundaryEdge ) {}
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/*ARGSUSED*/ static void noVertex( void *data ) {}
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/*ARGSUSED*/ static void noEnd( void ) {}
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/*ARGSUSED*/ static void noError( GLenum errno ) {}
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/*ARGSUSED*/ static void noCombine( GLdouble coords[3], void *data[4],
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GLfloat weight[4], void **dataOut ) {}
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/*ARGSUSED*/ static void noMesh( GLUmesh *mesh ) {}
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/*ARGSUSED*/ void __gl_noBeginData( GLenum type, void *polygonData ) {}
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/*ARGSUSED*/ void __gl_noEdgeFlagData( GLboolean boundaryEdge,
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void *polygonData ) {}
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/*ARGSUSED*/ void __gl_noVertexData( void *data, void *polygonData ) {}
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/*ARGSUSED*/ void __gl_noEndData( void *polygonData ) {}
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/*ARGSUSED*/ void __gl_noErrorData( GLenum errno, void *polygonData ) {}
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/*ARGSUSED*/ void __gl_noCombineData( GLdouble coords[3], void *data[4],
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GLfloat weight[4], void **outData,
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void *polygonData ) {}
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/* Half-edges are allocated in pairs (see mesh.c) */
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typedef struct { GLUhalfEdge e, eSym; } EdgePair;
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#define MAX(a,b) ((a) > (b) ? (a) : (b))
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#define MAX_FAST_ALLOC (MAX(sizeof(EdgePair), \
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MAX(sizeof(GLUvertex),sizeof(GLUface))))
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#ifdef NT
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GLUtesselator* APIENTRY gluNewTess( void )
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#else
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GLUtesselator *gluNewTess( void )
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#endif
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{
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GLUtesselator *tess;
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/* Only initialize fields which can be changed by the api. Other fields
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* are initialized where they are used.
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*/
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if (memInit( MAX_FAST_ALLOC ) == 0) {
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return 0; /* out of memory */
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}
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tess = (GLUtesselator *)memAlloc( sizeof( GLUtesselator ));
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if (tess == NULL) {
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return 0; /* out of memory */
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}
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tess->state = T_DORMANT;
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tess->normal[0] = 0;
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tess->normal[1] = 0;
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tess->normal[2] = 0;
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tess->relTolerance = GLU_TESS_DEFAULT_TOLERANCE;
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tess->windingRule = GLU_TESS_WINDING_ODD;
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tess->flagBoundary = FALSE;
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tess->boundaryOnly = FALSE;
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tess->callBegin = &noBegin;
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tess->callEdgeFlag = &noEdgeFlag;
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tess->callVertex = &noVertex;
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tess->callEnd = &noEnd;
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tess->callError = &noError;
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tess->callCombine = &noCombine;
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tess->callMesh = &noMesh;
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tess->callBeginData= &__gl_noBeginData;
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tess->callEdgeFlagData= &__gl_noEdgeFlagData;
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tess->callVertexData= &__gl_noVertexData;
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tess->callEndData= &__gl_noEndData;
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tess->callErrorData= &__gl_noErrorData;
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tess->callCombineData= &__gl_noCombineData;
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tess->polygonData= NULL;
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return tess;
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}
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static void MakeDormant( GLUtesselator *tess )
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{
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/* Return the tesselator to its original dormant state. */
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if( tess->mesh != NULL ) {
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__gl_meshDeleteMesh( tess->mesh );
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}
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tess->state = T_DORMANT;
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tess->lastEdge = NULL;
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tess->mesh = NULL;
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}
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#define RequireState( tess, s ) if( tess->state != s ) GotoState(tess,s)
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static void GotoState( GLUtesselator *tess, enum TessState newState )
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{
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#ifdef NT
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while( tess->state != (GLenum) newState ) {
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#else
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while( tess->state != newState ) {
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#endif
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/* We change the current state one level at a time, to get to
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* the desired state.
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*/
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#ifdef NT
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if( tess->state < (GLenum) newState ) {
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#else
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if( tess->state < newState ) {
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#endif
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switch( tess->state ) {
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case T_DORMANT:
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CALL_ERROR_OR_ERROR_DATA( GLU_TESS_MISSING_BEGIN_POLYGON );
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gluTessBeginPolygon( tess, NULL );
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break;
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case T_IN_POLYGON:
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CALL_ERROR_OR_ERROR_DATA( GLU_TESS_MISSING_BEGIN_CONTOUR );
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gluTessBeginContour( tess );
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break;
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}
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} else {
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switch( tess->state ) {
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case T_IN_CONTOUR:
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CALL_ERROR_OR_ERROR_DATA( GLU_TESS_MISSING_END_CONTOUR );
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gluTessEndContour( tess );
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break;
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case T_IN_POLYGON:
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CALL_ERROR_OR_ERROR_DATA( GLU_TESS_MISSING_END_POLYGON );
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/* gluTessEndPolygon( tess ) is too much work! */
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MakeDormant( tess );
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break;
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}
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}
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}
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}
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#ifdef NT
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void APIENTRY gluDeleteTess( GLUtesselator *tess )
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#else
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void gluDeleteTess( GLUtesselator *tess )
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#endif
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{
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RequireState( tess, T_DORMANT );
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memFree( tess );
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}
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#ifdef NT
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void APIENTRY gluTessProperty( GLUtesselator *tess, GLenum which, GLdouble value )
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#else
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void gluTessProperty( GLUtesselator *tess, GLenum which, GLdouble value )
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#endif
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{
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GLenum windingRule;
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switch( which ) {
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case GLU_TESS_TOLERANCE:
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if( value < 0.0 || value > 1.0 ) break;
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tess->relTolerance = value;
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return;
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case GLU_TESS_WINDING_RULE:
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windingRule = (GLenum) value;
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if( windingRule != value ) break; /* not an integer */
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switch( windingRule ) {
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case GLU_TESS_WINDING_ODD:
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case GLU_TESS_WINDING_NONZERO:
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case GLU_TESS_WINDING_POSITIVE:
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case GLU_TESS_WINDING_NEGATIVE:
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case GLU_TESS_WINDING_ABS_GEQ_TWO:
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tess->windingRule = windingRule;
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return;
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default:
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break;
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}
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case GLU_TESS_BOUNDARY_ONLY:
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tess->boundaryOnly = (value != 0);
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return;
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default:
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CALL_ERROR_OR_ERROR_DATA( GLU_INVALID_ENUM );
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return;
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}
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CALL_ERROR_OR_ERROR_DATA( GLU_INVALID_VALUE );
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}
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/* Returns tesselator property */
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#ifdef NT
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void APIENTRY gluGetTessProperty( GLUtesselator *tess, GLenum which, GLdouble *value )
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#else
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void gluGetTessProperty( GLUtesselator *tess, GLenum which, GLdouble *value )
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#endif
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{
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switch (which) {
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case GLU_TESS_TOLERANCE:
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/* tolerance should be in range [0..1] */
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assert(0.0 <= tess->relTolerance && tess->relTolerance <= 1.0);
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*value= tess->relTolerance;
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break;
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case GLU_TESS_WINDING_RULE:
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assert(tess->windingRule == GLU_TESS_WINDING_ODD ||
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tess->windingRule == GLU_TESS_WINDING_NONZERO ||
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tess->windingRule == GLU_TESS_WINDING_POSITIVE ||
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tess->windingRule == GLU_TESS_WINDING_NEGATIVE ||
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tess->windingRule == GLU_TESS_WINDING_ABS_GEQ_TWO);
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*value= tess->windingRule;
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break;
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case GLU_TESS_BOUNDARY_ONLY:
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assert(tess->boundaryOnly == TRUE || tess->boundaryOnly == FALSE);
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*value= tess->boundaryOnly;
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break;
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default:
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*value= 0.0;
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CALL_ERROR_OR_ERROR_DATA( GLU_INVALID_ENUM );
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break;
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}
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} /* gluGetTessProperty() */
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#ifdef NT
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void APIENTRY gluTessNormal( GLUtesselator *tess, GLdouble x, GLdouble y, GLdouble z )
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#else
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void gluTessNormal( GLUtesselator *tess, GLdouble x, GLdouble y, GLdouble z )
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#endif
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{
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tess->normal[0] = x;
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tess->normal[1] = y;
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tess->normal[2] = z;
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}
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#ifdef NT
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void APIENTRY gluTessCallback( GLUtesselator *tess, GLenum which, void (*fn)())
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#else
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void gluTessCallback( GLUtesselator *tess, GLenum which, void (*fn)())
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#endif
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{
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switch( which ) {
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case GLU_TESS_BEGIN:
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tess->callBegin = (fn == NULL) ? &noBegin : (void (*)(GLenum)) fn;
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return;
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case GLU_TESS_BEGIN_DATA:
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tess->callBeginData = (fn == NULL) ? &__gl_noBeginData :
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(void (*)(GLenum, void *)) fn;
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return;
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case GLU_TESS_EDGE_FLAG:
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tess->callEdgeFlag = (fn == NULL) ? &noEdgeFlag : (void (*)(GLboolean)) fn;
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/* If the client wants boundary edges to be flagged,
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* we render everything as separate triangles (no strips or fans).
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*/
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tess->flagBoundary = (fn != NULL);
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return;
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case GLU_TESS_EDGE_FLAG_DATA:
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tess->callEdgeFlagData= (fn == NULL) ? &__gl_noEdgeFlagData :
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(void (*)(GLboolean, void *)) fn;
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/* If the client wants boundary edges to be flagged,
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* we render everything as separate triangles (no strips or fans).
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*/
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tess->flagBoundary = (fn != NULL);
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return;
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case GLU_TESS_VERTEX:
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tess->callVertex = (fn == NULL) ? &noVertex : (void (*)(void *)) fn;
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return;
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case GLU_TESS_VERTEX_DATA:
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tess->callVertexData = (fn == NULL) ? &__gl_noVertexData :
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(void (*)(void *, void *)) fn;
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return;
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case GLU_TESS_END:
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tess->callEnd = (fn == NULL) ? &noEnd : (void (*)(void)) fn;
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return;
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case GLU_TESS_END_DATA:
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tess->callEndData = (fn == NULL) ? &__gl_noEndData :
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(void (*)(void *)) fn;
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return;
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case GLU_TESS_ERROR:
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tess->callError = (fn == NULL) ? &noError : (void (*)(GLenum)) fn;
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return;
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case GLU_TESS_ERROR_DATA:
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tess->callErrorData = (fn == NULL) ? &__gl_noErrorData :
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(void (*)(GLenum, void *)) fn;
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return;
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case GLU_TESS_COMBINE:
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tess->callCombine = (fn == NULL) ? &noCombine :
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(void (*)(GLdouble [3],void *[4], GLfloat [4], void ** )) fn;
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return;
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case GLU_TESS_COMBINE_DATA:
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tess->callCombineData = (fn == NULL) ? &__gl_noCombineData :
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(void (*)(GLdouble [3],
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void *[4],
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GLfloat [4],
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void **,
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void *)) fn;
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return;
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#ifndef NT
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case GLU_TESS_MESH:
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tess->callMesh = (fn == NULL) ? &noMesh : (void (*)(GLUmesh *)) fn;
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return;
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#endif
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default:
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CALL_ERROR_OR_ERROR_DATA( GLU_INVALID_ENUM );
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return;
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}
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}
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static void AddVertex( GLUtesselator *tess, GLdouble coords[3], void *data )
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{
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GLUhalfEdge *e;
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e = tess->lastEdge;
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if( e == NULL ) {
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/* Make a self-loop (one vertex, one edge). */
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e = __gl_meshMakeEdge( tess->mesh );
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__gl_meshSplice( e, e->Sym );
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} else {
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/* Create a new vertex and edge which immediately follow e
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* in the ordering around the left face.
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*/
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(void) __gl_meshSplitEdge( e );
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e = e->Lnext;
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}
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/* The new vertex is now e->Org. */
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e->Org->data = data;
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e->Org->coords[0] = coords[0];
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e->Org->coords[1] = coords[1];
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e->Org->coords[2] = coords[2];
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/* The winding of an edge says how the winding number changes as we
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* cross from the edge''s right face to its left face. We add the
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* vertices in such an order that a CCW contour will add +1 to
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* the winding number of the region inside the contour.
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*/
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e->winding = 1;
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e->Sym->winding = -1;
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tess->lastEdge = e;
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}
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static void CacheVertex( GLUtesselator *tess, GLdouble coords[3], void *data )
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{
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CachedVertex *v = &tess->cache[tess->cacheCount];
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v->data = data;
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v->coords[0] = coords[0];
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v->coords[1] = coords[1];
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v->coords[2] = coords[2];
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++tess->cacheCount;
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}
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static void EmptyCache( GLUtesselator *tess )
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{
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CachedVertex *v = tess->cache;
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CachedVertex *vLast;
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tess->mesh = __gl_meshNewMesh();
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for( vLast = v + tess->cacheCount; v < vLast; ++v ) {
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AddVertex( tess, v->coords, v->data );
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}
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tess->cacheCount = 0;
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tess->emptyCache = FALSE;
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}
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#ifdef NT
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void APIENTRY gluTessVertex( GLUtesselator *tess, GLdouble coords[3], void *data )
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#else
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void gluTessVertex( GLUtesselator *tess, GLdouble coords[3], void *data )
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#endif
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{
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int i, tooLarge = FALSE;
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GLdouble x, clamped[3];
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RequireState( tess, T_IN_CONTOUR );
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if( tess->emptyCache ) {
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EmptyCache( tess );
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tess->lastEdge = NULL;
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}
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for( i = 0; i < 3; ++i ) {
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x = coords[i];
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if( x < - GLU_TESS_MAX_COORD ) {
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x = - GLU_TESS_MAX_COORD;
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tooLarge = TRUE;
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}
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if( x > GLU_TESS_MAX_COORD ) {
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x = GLU_TESS_MAX_COORD;
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tooLarge = TRUE;
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}
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clamped[i] = x;
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}
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if( tooLarge ) {
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CALL_ERROR_OR_ERROR_DATA( GLU_TESS_COORD_TOO_LARGE );
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}
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if( tess->mesh == NULL ) {
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if( tess->cacheCount < TESS_MAX_CACHE ) {
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CacheVertex( tess, clamped, data );
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return;
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}
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EmptyCache( tess );
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}
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AddVertex( tess, clamped, data );
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}
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#ifdef NT
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void APIENTRY gluTessBeginPolygon( GLUtesselator *tess, void *data )
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#else
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void gluTessBeginPolygon( GLUtesselator *tess, void *data )
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#endif
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{
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RequireState( tess, T_DORMANT );
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tess->state = T_IN_POLYGON;
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tess->cacheCount = 0;
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tess->emptyCache = FALSE;
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tess->mesh = NULL;
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tess->polygonData= data;
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}
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#ifdef NT
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void APIENTRY gluTessBeginContour( GLUtesselator *tess )
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#else
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void gluTessBeginContour( GLUtesselator *tess )
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#endif
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{
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RequireState( tess, T_IN_POLYGON );
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tess->state = T_IN_CONTOUR;
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tess->lastEdge = NULL;
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if( tess->cacheCount > 0 ) {
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/* Just set a flag so we don't get confused by empty contours
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* -- these can be generated accidentally with the obsolete
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* NextContour() interface.
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*/
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tess->emptyCache = TRUE;
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}
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}
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#ifdef NT
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void APIENTRY gluTessEndContour( GLUtesselator *tess )
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#else
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void gluTessEndContour( GLUtesselator *tess )
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#endif
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{
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RequireState( tess, T_IN_CONTOUR );
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tess->state = T_IN_POLYGON;
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}
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#ifdef NT
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void APIENTRY gluTessEndPolygon( GLUtesselator *tess )
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#else
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void gluTessEndPolygon( GLUtesselator *tess )
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#endif
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{
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GLUmesh *mesh;
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RequireState( tess, T_IN_POLYGON );
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tess->state = T_DORMANT;
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if( tess->mesh == NULL ) {
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if( ! tess->flagBoundary && tess->callMesh == &noMesh ) {
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|
|
/* Try some special code to make the easy cases go quickly
|
|
* (eg. convex polygons). This code does NOT handle multiple contours,
|
|
* intersections, edge flags, and of course it does not generate
|
|
* an explicit mesh either.
|
|
*/
|
|
if( __gl_renderCache( tess )) {
|
|
tess->polygonData= NULL;
|
|
return;
|
|
}
|
|
}
|
|
EmptyCache( tess );
|
|
}
|
|
|
|
/* Determine the polygon normal and project vertices onto the plane
|
|
* of the polygon.
|
|
*/
|
|
__gl_projectPolygon( tess );
|
|
|
|
/* __gl_computeInterior( tess ) computes the planar arrangement specified
|
|
* by the given contours, and further subdivides this arrangement
|
|
* into regions. Each region is marked "inside" if it belongs
|
|
* to the polygon, according to the rule given by tess->windingRule.
|
|
* Each interior region is guaranteed be monotone.
|
|
*/
|
|
__gl_computeInterior( tess );
|
|
|
|
mesh = tess->mesh;
|
|
if( ! tess->fatalError ) {
|
|
/* If the user wants only the boundary contours, we throw away all edges
|
|
* except those which separate the interior from the exterior.
|
|
* Otherwise we tesselate all the regions marked "inside".
|
|
*/
|
|
if( tess->boundaryOnly ) {
|
|
__gl_meshSetWindingNumber( mesh, 1, TRUE );
|
|
} else {
|
|
__gl_meshTesselateInterior( mesh );
|
|
}
|
|
__gl_meshCheckMesh( mesh );
|
|
|
|
if( tess->callBegin != &noBegin || tess->callEnd != &noEnd
|
|
|| tess->callVertex != &noVertex || tess->callEdgeFlag != &noEdgeFlag
|
|
|| tess->callBeginData != &__gl_noBeginData
|
|
|| tess->callEndData != &__gl_noEndData
|
|
|| tess->callVertexData != &__gl_noVertexData
|
|
|| tess->callEdgeFlagData != &__gl_noEdgeFlagData )
|
|
{
|
|
if( tess->boundaryOnly ) {
|
|
__gl_renderBoundary( tess, mesh ); /* output boundary contours */
|
|
} else {
|
|
__gl_renderMesh( tess, mesh ); /* output strips and fans */
|
|
}
|
|
}
|
|
if( tess->callMesh != &noMesh ) {
|
|
|
|
/* Throw away the exterior faces, so that all faces are interior.
|
|
* This way the user doesn't have to check the "inside" flag,
|
|
* and we don't need to even reveal its existence. It also leaves
|
|
* the freedom for an implementation to not generate the exterior
|
|
* faces in the first place.
|
|
*/
|
|
__gl_meshDiscardExterior( mesh );
|
|
(*tess->callMesh)( mesh ); /* user wants the mesh itself */
|
|
tess->mesh = NULL;
|
|
tess->polygonData= NULL;
|
|
return;
|
|
}
|
|
}
|
|
__gl_meshDeleteMesh( mesh );
|
|
tess->polygonData= NULL;
|
|
tess->mesh = NULL;
|
|
}
|
|
|
|
|
|
#ifndef NT
|
|
void gluDeleteMesh( GLUmesh *mesh )
|
|
{
|
|
__gl_meshDeleteMesh( mesh );
|
|
}
|
|
#endif
|
|
|
|
|
|
/*******************************************************/
|
|
|
|
/* Obsolete calls -- for backward compatibility */
|
|
|
|
#ifdef NT
|
|
void APIENTRY gluBeginPolygon( GLUtesselator *tess )
|
|
#else
|
|
void gluBeginPolygon( GLUtesselator *tess )
|
|
#endif
|
|
{
|
|
gluTessBeginPolygon( tess, NULL );
|
|
gluTessBeginContour( tess );
|
|
}
|
|
|
|
|
|
/*ARGSUSED*/
|
|
#ifdef NT
|
|
void APIENTRY gluNextContour( GLUtesselator *tess, GLenum type )
|
|
#else
|
|
void gluNextContour( GLUtesselator *tess, GLenum type )
|
|
#endif
|
|
{
|
|
gluTessEndContour( tess );
|
|
gluTessBeginContour( tess );
|
|
}
|
|
|
|
|
|
#ifdef NT
|
|
void APIENTRY gluEndPolygon( GLUtesselator *tess )
|
|
#else
|
|
void gluEndPolygon( GLUtesselator *tess )
|
|
#endif
|
|
{
|
|
gluTessEndContour( tess );
|
|
gluTessEndPolygon( tess );
|
|
}
|
|
|
|
|
|
|
|
|