patch to import Jon Smirl's work from Bitkeeper

1 files changed, 328 insertions, 0 deletions

diff --git a/src/glu/mini/tess.c b/src/glu/mini/tess.c
new file mode 100644
index 0000000000..1a384239be
--- /dev/null
+++ b/src/glu/mini/tess.c
@@ -0,0 +1,328 @@
+/* $Id: tess.c,v 1.2 2003/08/22 20:11:43 brianp Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * 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
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+
+/*
+ * This file is part of the polygon tesselation code contributed by
+ * Bogdan Sikorski
+ */
+
+
+#ifdef PC_HEADER
+#include "all.h"
+#else
+#include <math.h>
+#include <stdlib.h>
+#include "tess.h"
+#endif
+
+
+/*
+ * This is ugly, but seems the easiest way to do things to make the
+ * code work under YellowBox for Windows
+ */
+#if defined(OPENSTEP) && defined(CALLBACK)
+#undef CALLBACK
+#define CALLBACK
+#endif
+
+
+static void delete_contours(GLUtriangulatorObj *);
+
+#ifdef __CYGWIN32__
+#define _CALLBACK
+#else
+#define _CALLBACK GLCALLBACK
+#endif
+
+
+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;
+}
+
+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);
+}
+
+GLUtriangulatorObj *GLAPIENTRY
+gluNewTess(void)
+{
+   GLUtriangulatorObj *tobj;
+
+   if ((tobj = (GLUtriangulatorObj *)
+	malloc(sizeof(struct GLUtesselator))) == NULL)
+      return NULL;
+   tobj->contours = tobj->last_contour = NULL;
+   init_callbacks(&tobj->callbacks);
+   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) ())
+{
+   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)
+{
+   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)
+{
+/*
+	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;
+   }
+}
+
+
+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);
+}
+
+
+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);
+}
+
+
+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;
+   }
+}
+
+
+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;
+}
+
+
+void GLAPIENTRY
+gluTessNormal(GLUtesselator *tess, GLdouble valueX, GLdouble valueY, GLdouble valueZ)
+{
+   /* dummy function */
+   (void) tess;
+   (void) valueX;
+   (void) valueY;
+   (void) valueZ;
+}