-/* $Id: tess.c,v 1.1 1999/08/19 00:55:42 jtg Exp $ */
/*
* Mesa 3-D graphics library
- * Version: 3.1
- * Copyright (C) 1995-1999 Brian Paul
+ * Version: 3.3
+ * Copyright (C) 1995-2000 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
*/
-/*
- * $Log: tess.c,v $
- * Revision 1.1 1999/08/19 00:55:42 jtg
- * Initial revision
- *
- * Revision 1.11 1999/02/27 13:55:31 brianp
- * fixed BeOS-related GLU typedef problems
- *
- * Revision 1.10 1999/01/03 03:23:15 brianp
- * now using GLAPIENTRY and GLCALLBACK keywords (Ted Jump)
- *
- * Revision 1.9 1998/06/01 01:10:29 brianp
- * small update for Next/OpenStep from Alexander Mai
- *
- * Revision 1.8 1998/02/04 00:27:58 brianp
- * cygnus changes from Stephane Rehel
- *
- * Revision 1.7 1998/01/16 03:35:26 brianp
- * fixed Windows compilation warnings (Theodore Jump)
- *
- * Revision 1.6 1997/09/17 01:51:48 brianp
- * changed glu*Callback() functions to match prototype in glu.h
- *
- * Revision 1.5 1997/07/24 01:28:44 brianp
- * changed precompiled header symbol from PCH to PC_HEADER
- *
- * Revision 1.4 1997/05/28 02:29:38 brianp
- * added support for precompiled headers (PCH), inserted APIENTRY keyword
- *
- * Revision 1.3 1996/11/12 01:23:02 brianp
- * added test to prevent free(vertex) when vertex==NULL in delete_contours()
- *
- * Revision 1.2 1996/10/22 22:57:19 brianp
- * better error handling in gluBegin/EndPolygon() from Erich Eder
- *
- * Revision 1.1 1996/09/27 01:19:39 brianp
- * Initial revision
- *
- */
-
-
/*
* This file is part of the polygon tesselation code contributed by
* Bogdan Sikorski
* This is ugly, but seems the easiest way to do things to make the
* code work under YellowBox for Windows
*/
-#if defined(OPENSTEP) && defined(GLCALLBACK)
-#undef GLCALLBACK
-#define GLCALLBACK
+#if defined(OPENSTEP) && defined(CALLBACK)
+#undef CALLBACK
+#define CALLBACK
#endif
-extern void tess_test_polygon(GLUtriangulatorObj *);
-extern void tess_find_contour_hierarchies(GLUtriangulatorObj *);
-extern void tess_handle_holes(GLUtriangulatorObj *);
-extern void tess_tesselate(GLUtriangulatorObj *);
-extern void tess_tesselate_with_edge_flag(GLUtriangulatorObj *);
static void delete_contours(GLUtriangulatorObj *);
#ifdef __CYGWIN32__
#define _CALLBACK GLCALLBACK
#endif
-void init_callbacks(tess_callbacks *callbacks)
+
+static void
+init_callbacks(tess_callbacks * callbacks)
{
- callbacks->begin = ( void (_CALLBACK*)(GLenum) ) 0;
- callbacks->edgeFlag = ( void (_CALLBACK*)(GLboolean) ) 0;
- callbacks->vertex = ( void (_CALLBACK*)(void*) ) 0;
- callbacks->end = ( void (_CALLBACK*)(void) ) 0;
- callbacks->error = ( void (_CALLBACK*)(GLenum) ) 0;
+ callbacks->begin = (void (_CALLBACK *) (GLenum)) 0;
+ callbacks->edgeFlag = (void (_CALLBACK *) (GLboolean)) 0;
+ callbacks->vertex = (void (_CALLBACK *) (void *)) 0;
+ callbacks->end = (void (_CALLBACK *) (void)) 0;
+ callbacks->error = (void (_CALLBACK *) (GLenum)) 0;
}
-void tess_call_user_error(GLUtriangulatorObj *tobj, GLenum gluerr)
+void
+tess_call_user_error(GLUtriangulatorObj * tobj, GLenum gluerr)
{
- if(tobj->error==GLU_NO_ERROR)
- tobj->error=gluerr;
- if(tobj->callbacks.error!=NULL)
- (tobj->callbacks.error)(gluerr);
+ if (tobj->error == GLU_NO_ERROR)
+ tobj->error = gluerr;
+ if (tobj->callbacks.error != NULL)
+ (tobj->callbacks.error) (gluerr);
}
-GLUtriangulatorObj* GLAPIENTRY gluNewTess( void )
+GLUtriangulatorObj *GLAPIENTRY
+gluNewTess(void)
{
GLUtriangulatorObj *tobj;
- tobj = (GLUtriangulatorObj *) malloc(sizeof(struct GLUtesselator));
- if (!tobj)
+
+ if ((tobj = (GLUtriangulatorObj *)
+ malloc(sizeof(struct GLUtesselator))) == NULL)
return NULL;
- tobj->contours=tobj->last_contour=NULL;
+ tobj->contours = tobj->last_contour = NULL;
init_callbacks(&tobj->callbacks);
- tobj->error=GLU_NO_ERROR;
- tobj->current_polygon=NULL;
- tobj->contour_cnt=0;
+ tobj->error = GLU_NO_ERROR;
+ tobj->current_polygon = NULL;
+ tobj->contour_cnt = 0;
return tobj;
}
-void GLAPIENTRY gluTessCallback( GLUtriangulatorObj *tobj, GLenum which,
- void (GLCALLBACK *fn)() )
+void GLAPIENTRY
+gluTessCallback(GLUtriangulatorObj * tobj, GLenum which,
+ void (GLCALLBACK * fn) ())
{
- switch(which)
- {
- case GLU_BEGIN:
- tobj->callbacks.begin = (void (_CALLBACK*)(GLenum)) fn;
- break;
- case GLU_EDGE_FLAG:
- tobj->callbacks.edgeFlag = (void (_CALLBACK*)(GLboolean)) fn;
- break;
- case GLU_VERTEX:
- tobj->callbacks.vertex = (void (_CALLBACK*)(void *)) fn;
- break;
- case GLU_END:
- tobj->callbacks.end = (void (_CALLBACK*)(void)) fn;
- break;
- case GLU_ERROR:
- tobj->callbacks.error = (void (_CALLBACK*)(GLenum)) fn;
- break;
- default:
- tobj->error=GLU_INVALID_ENUM;
- break;
- }
+ switch (which) {
+ case GLU_BEGIN:
+ tobj->callbacks.begin = (void (_CALLBACK *) (GLenum)) fn;
+ break;
+ case GLU_EDGE_FLAG:
+ tobj->callbacks.edgeFlag = (void (_CALLBACK *) (GLboolean)) fn;
+ break;
+ case GLU_VERTEX:
+ tobj->callbacks.vertex = (void (_CALLBACK *) (void *)) fn;
+ break;
+ case GLU_END:
+ tobj->callbacks.end = (void (_CALLBACK *) (void)) fn;
+ break;
+ case GLU_ERROR:
+ tobj->callbacks.error = (void (_CALLBACK *) (GLenum)) fn;
+ break;
+ default:
+ tobj->error = GLU_INVALID_ENUM;
+ break;
+ }
}
-void GLAPIENTRY gluDeleteTess( GLUtriangulatorObj *tobj )
+void GLAPIENTRY
+gluDeleteTess(GLUtriangulatorObj * tobj)
{
- if(tobj->error==GLU_NO_ERROR && tobj->contour_cnt)
- /* was gluEndPolygon called? */
- tess_call_user_error(tobj,GLU_TESS_ERROR1);
- /* delete all internal structures */
- delete_contours(tobj);
- free(tobj);
+ if (tobj->error == GLU_NO_ERROR && tobj->contour_cnt)
+ /* was gluEndPolygon called? */
+ tess_call_user_error(tobj, GLU_TESS_ERROR1);
+ /* delete all internal structures */
+ delete_contours(tobj);
+ free(tobj);
}
-void GLAPIENTRY gluBeginPolygon( GLUtriangulatorObj *tobj )
+void GLAPIENTRY
+gluBeginPolygon(GLUtriangulatorObj * tobj)
{
/*
if(tobj->error!=GLU_NO_ERROR)
return;
*/
- tobj->error = GLU_NO_ERROR;
- if(tobj->current_polygon!=NULL)
- {
- /* gluEndPolygon was not called */
- tess_call_user_error(tobj,GLU_TESS_ERROR1);
- /* delete all internal structures */
- delete_contours(tobj);
- }
- else
- {
- if((tobj->current_polygon=
- (tess_polygon *)malloc(sizeof(tess_polygon)))==NULL)
- {
- tess_call_user_error(tobj,GLU_OUT_OF_MEMORY);
- return;
- }
- tobj->current_polygon->vertex_cnt=0;
- tobj->current_polygon->vertices=
- tobj->current_polygon->last_vertex=NULL;
- }
+ tobj->error = GLU_NO_ERROR;
+ if (tobj->current_polygon != NULL) {
+ /* gluEndPolygon was not called */
+ tess_call_user_error(tobj, GLU_TESS_ERROR1);
+ /* delete all internal structures */
+ delete_contours(tobj);
+ }
+ else {
+ if ((tobj->current_polygon =
+ (tess_polygon *) malloc(sizeof(tess_polygon))) == NULL) {
+ tess_call_user_error(tobj, GLU_OUT_OF_MEMORY);
+ return;
+ }
+ tobj->current_polygon->vertex_cnt = 0;
+ tobj->current_polygon->vertices =
+ tobj->current_polygon->last_vertex = NULL;
+ }
}
-void GLAPIENTRY gluEndPolygon( GLUtriangulatorObj *tobj )
+void GLAPIENTRY
+gluEndPolygon(GLUtriangulatorObj * tobj)
{
- /*tess_contour *contour_ptr;*/
-
- /* there was an error */
- if(tobj->error!=GLU_NO_ERROR) goto end;
-
- /* check if gluBeginPolygon was called */
- if(tobj->current_polygon==NULL)
- {
- tess_call_user_error(tobj,GLU_TESS_ERROR2);
- return;
- }
- tess_test_polygon(tobj);
- /* there was an error */
- if(tobj->error!=GLU_NO_ERROR) goto end;
-
- /* any real contours? */
- if(tobj->contour_cnt==0)
- {
- /* delete all internal structures */
- delete_contours(tobj);
- return;
- }
- tess_find_contour_hierarchies(tobj);
- /* there was an error */
- if(tobj->error!=GLU_NO_ERROR) goto end;
-
- tess_handle_holes(tobj);
- /* there was an error */
- if(tobj->error!=GLU_NO_ERROR) goto end;
-
- /* if no callbacks, nothing to do */
- if(tobj->callbacks.begin!=NULL && tobj->callbacks.vertex!=NULL &&
- tobj->callbacks.end!=NULL)
- {
- if(tobj->callbacks.edgeFlag==NULL)
- tess_tesselate(tobj);
- else
- tess_tesselate_with_edge_flag(tobj);
- }
-
-end:
- /* delete all internal structures */
- delete_contours(tobj);
+ /*tess_contour *contour_ptr; */
+
+ /* there was an error */
+ if (tobj->error != GLU_NO_ERROR)
+ goto end;
+
+ /* check if gluBeginPolygon was called */
+ if (tobj->current_polygon == NULL) {
+ tess_call_user_error(tobj, GLU_TESS_ERROR2);
+ return;
+ }
+ tess_test_polygon(tobj);
+ /* there was an error */
+ if (tobj->error != GLU_NO_ERROR)
+ goto end;
+
+ /* any real contours? */
+ if (tobj->contour_cnt == 0) {
+ /* delete all internal structures */
+ delete_contours(tobj);
+ return;
+ }
+ tess_find_contour_hierarchies(tobj);
+ /* there was an error */
+ if (tobj->error != GLU_NO_ERROR)
+ goto end;
+
+ tess_handle_holes(tobj);
+ /* there was an error */
+ if (tobj->error != GLU_NO_ERROR)
+ goto end;
+
+ /* if no callbacks, nothing to do */
+ if (tobj->callbacks.begin != NULL && tobj->callbacks.vertex != NULL &&
+ tobj->callbacks.end != NULL) {
+ if (tobj->callbacks.edgeFlag == NULL)
+ tess_tesselate(tobj);
+ else
+ tess_tesselate_with_edge_flag(tobj);
+ }
+
+ end:
+ /* delete all internal structures */
+ delete_contours(tobj);
}
-void GLAPIENTRY gluNextContour( GLUtriangulatorObj *tobj, GLenum type )
+void GLAPIENTRY
+gluNextContour(GLUtriangulatorObj * tobj, GLenum type)
{
- if(tobj->error!=GLU_NO_ERROR)
- return;
- if(tobj->current_polygon==NULL)
- {
- tess_call_user_error(tobj,GLU_TESS_ERROR2);
- return;
- }
- /* first contour? */
- if(tobj->current_polygon->vertex_cnt)
- tess_test_polygon(tobj);
+ if (tobj->error != GLU_NO_ERROR)
+ return;
+ if (tobj->current_polygon == NULL) {
+ tess_call_user_error(tobj, GLU_TESS_ERROR2);
+ return;
+ }
+ /* first contour? */
+ if (tobj->current_polygon->vertex_cnt)
+ tess_test_polygon(tobj);
}
-void GLAPIENTRY gluTessVertex( GLUtriangulatorObj *tobj, GLdouble v[3], void *data )
+void GLAPIENTRY
+gluTessVertex(GLUtriangulatorObj * tobj, GLdouble v[3], void *data)
{
- tess_polygon *polygon=tobj->current_polygon;
- tess_vertex *last_vertex_ptr;
-
- if(tobj->error!=GLU_NO_ERROR)
- return;
- if(polygon==NULL)
- {
- tess_call_user_error(tobj,GLU_TESS_ERROR2);
- return;
- }
- last_vertex_ptr=polygon->last_vertex;
- if(last_vertex_ptr==NULL)
- {
- if((last_vertex_ptr=(tess_vertex *)
- malloc(sizeof(tess_vertex)))==NULL)
- {
- tess_call_user_error(tobj,GLU_OUT_OF_MEMORY);
- return;
- }
- polygon->vertices=last_vertex_ptr;
- polygon->last_vertex=last_vertex_ptr;
- last_vertex_ptr->data=data;
- last_vertex_ptr->location[0]=v[0];
- last_vertex_ptr->location[1]=v[1];
- last_vertex_ptr->location[2]=v[2];
- last_vertex_ptr->next=NULL;
- last_vertex_ptr->previous=NULL;
- ++(polygon->vertex_cnt);
- }
- else
- {
- tess_vertex *vertex_ptr;
-
- /* same point twice? */
- if(fabs(last_vertex_ptr->location[0]-v[0]) < EPSILON &&
- fabs(last_vertex_ptr->location[1]-v[1]) < EPSILON &&
- fabs(last_vertex_ptr->location[2]-v[2]) < EPSILON)
- {
- tess_call_user_error(tobj,GLU_TESS_ERROR6);
- return;
- }
- if((vertex_ptr=(tess_vertex *)
- malloc(sizeof(tess_vertex)))==NULL)
- {
- tess_call_user_error(tobj,GLU_OUT_OF_MEMORY);
- return;
- }
- vertex_ptr->data=data;
- vertex_ptr->location[0]=v[0];
- vertex_ptr->location[1]=v[1];
- vertex_ptr->location[2]=v[2];
- vertex_ptr->next=NULL;
- vertex_ptr->previous=last_vertex_ptr;
- ++(polygon->vertex_cnt);
- last_vertex_ptr->next=vertex_ptr;
- polygon->last_vertex=vertex_ptr;
- }
+ tess_polygon *polygon = tobj->current_polygon;
+ tess_vertex *last_vertex_ptr;
+
+ if (tobj->error != GLU_NO_ERROR)
+ return;
+ if (polygon == NULL) {
+ tess_call_user_error(tobj, GLU_TESS_ERROR2);
+ return;
+ }
+ last_vertex_ptr = polygon->last_vertex;
+ if (last_vertex_ptr == NULL) {
+ if ((last_vertex_ptr = (tess_vertex *)
+ malloc(sizeof(tess_vertex))) == NULL) {
+ tess_call_user_error(tobj, GLU_OUT_OF_MEMORY);
+ return;
+ }
+ polygon->vertices = last_vertex_ptr;
+ polygon->last_vertex = last_vertex_ptr;
+ last_vertex_ptr->data = data;
+ last_vertex_ptr->location[0] = v[0];
+ last_vertex_ptr->location[1] = v[1];
+ last_vertex_ptr->location[2] = v[2];
+ last_vertex_ptr->next = NULL;
+ last_vertex_ptr->previous = NULL;
+ ++(polygon->vertex_cnt);
+ }
+ else {
+ tess_vertex *vertex_ptr;
+
+ /* same point twice? */
+ if (fabs(last_vertex_ptr->location[0] - v[0]) < EPSILON &&
+ fabs(last_vertex_ptr->location[1] - v[1]) < EPSILON &&
+ fabs(last_vertex_ptr->location[2] - v[2]) < EPSILON) {
+ tess_call_user_error(tobj, GLU_TESS_ERROR6);
+ return;
+ }
+ if ((vertex_ptr = (tess_vertex *)
+ malloc(sizeof(tess_vertex))) == NULL) {
+ tess_call_user_error(tobj, GLU_OUT_OF_MEMORY);
+ return;
+ }
+ vertex_ptr->data = data;
+ vertex_ptr->location[0] = v[0];
+ vertex_ptr->location[1] = v[1];
+ vertex_ptr->location[2] = v[2];
+ vertex_ptr->next = NULL;
+ vertex_ptr->previous = last_vertex_ptr;
+ ++(polygon->vertex_cnt);
+ last_vertex_ptr->next = vertex_ptr;
+ polygon->last_vertex = vertex_ptr;
+ }
}
-static void delete_contours(GLUtriangulatorObj *tobj)
+static void
+delete_contours(GLUtriangulatorObj * tobj)
{
- tess_polygon *polygon=tobj->current_polygon;
- tess_contour *contour,*contour_tmp;
- tess_vertex *vertex,*vertex_tmp;
-
- /* remove current_polygon list - if exists due to detected error */
- if(polygon!=NULL)
- {
- if (polygon->vertices)
- {
- for(vertex=polygon->vertices;vertex!=polygon->last_vertex;)
- {
- vertex_tmp=vertex->next;
- free(vertex);
- vertex=vertex_tmp;
- }
- free(vertex);
- }
- free(polygon);
- tobj->current_polygon=NULL;
- }
- /* remove all contour data */
- for(contour=tobj->contours;contour!=NULL;)
- {
- for(vertex=contour->vertices;vertex!=contour->last_vertex;)
- {
- vertex_tmp=vertex->next;
- free(vertex);
- vertex=vertex_tmp;
- }
- free(vertex);
- contour_tmp=contour->next;
- free(contour);
- contour=contour_tmp;
- }
- tobj->contours=tobj->last_contour=NULL;
- tobj->contour_cnt=0;
+ tess_polygon *polygon = tobj->current_polygon;
+ tess_contour *contour, *contour_tmp;
+ tess_vertex *vertex, *vertex_tmp;
+
+ /* remove current_polygon list - if exists due to detected error */
+ if (polygon != NULL) {
+ if (polygon->vertices) {
+ for (vertex = polygon->vertices; vertex != polygon->last_vertex;) {
+ vertex_tmp = vertex->next;
+ free(vertex);
+ vertex = vertex_tmp;
+ }
+ free(vertex);
+ }
+ free(polygon);
+ tobj->current_polygon = NULL;
+ }
+ /* remove all contour data */
+ for (contour = tobj->contours; contour != NULL;) {
+ for (vertex = contour->vertices; vertex != contour->last_vertex;) {
+ vertex_tmp = vertex->next;
+ free(vertex);
+ vertex = vertex_tmp;
+ }
+ free(vertex);
+ contour_tmp = contour->next;
+ free(contour);
+ contour = contour_tmp;
+ }
+ tobj->contours = tobj->last_contour = NULL;
+ tobj->contour_cnt = 0;
}
-
+void GLAPIENTRY
+gluTessNormal(GLUtesselator *tess, GLdouble valueX, GLdouble valueY, GLdouble valueZ)
+{
+ /* dummy function */
+ (void) tess;
+ (void) valueX;
+ (void) valueY;
+ (void) valueZ;
+}
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