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+/*
+ * Copyright (c) 1993-1997, Silicon Graphics, Inc.
+ * ALL RIGHTS RESERVED 
+ * Permission to use, copy, modify, and distribute this software for 
+ * any purpose and without fee is hereby granted, provided that the above
+ * copyright notice appear in all copies and that both the copyright notice
+ * and this permission notice appear in supporting documentation, and that 
+ * the name of Silicon Graphics, Inc. not be used in advertising
+ * or publicity pertaining to distribution of the software without specific,
+ * written prior permission. 
+ *
+ * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
+ * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
+ * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
+ * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
+ * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
+ * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
+ * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
+ * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
+ * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
+ * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
+ * 
+ * US Government Users Restricted Rights 
+ * Use, duplication, or disclosure by the Government is subject to
+ * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
+ * (c)(1)(ii) of the Rights in Technical Data and Computer Software
+ * clause at DFARS 252.227-7013 and/or in similar or successor
+ * clauses in the FAR or the DOD or NASA FAR Supplement.
+ * Unpublished-- rights reserved under the copyright laws of the
+ * United States.  Contractor/manufacturer is Silicon Graphics,
+ * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
+ *
+ * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
+ */
+
+/*
+ *  tesswind.c
+ *  This program demonstrates the winding rule polygon 
+ *  tessellation property.  Four tessellated objects are drawn, 
+ *  each with very different contours.  When the w key is pressed, 
+ *  the objects are drawn with a different winding rule.
+ */
+#include <GL/glut.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#ifdef GLU_VERSION_1_2
+
+/* Win32 calling conventions. */
+#ifndef CALLBACK
+#define CALLBACK
+#endif
+
+GLdouble currentWinding = GLU_TESS_WINDING_ODD;
+int currentShape = 0;
+GLUtesselator *tobj;
+GLuint list;
+
+/*  Make four display lists, 
+ *  each with a different tessellated object. 
+ */
+void makeNewLists (void) {
+   int i;
+   static GLdouble rects[12][3] = 
+      {50.0, 50.0, 0.0, 300.0, 50.0, 0.0, 
+       300.0, 300.0, 0.0, 50.0, 300.0, 0.0,
+       100.0, 100.0, 0.0, 250.0, 100.0, 0.0, 
+       250.0, 250.0, 0.0, 100.0, 250.0, 0.0,
+       150.0, 150.0, 0.0, 200.0, 150.0, 0.0, 
+       200.0, 200.0, 0.0, 150.0, 200.0, 0.0};
+   static GLdouble spiral[16][3] = 
+      {400.0, 250.0, 0.0, 400.0, 50.0, 0.0, 
+       50.0, 50.0, 0.0, 50.0, 400.0, 0.0, 
+       350.0, 400.0, 0.0, 350.0, 100.0, 0.0, 
+       100.0, 100.0, 0.0, 100.0, 350.0, 0.0, 
+       300.0, 350.0, 0.0, 300.0, 150.0, 0.0, 
+       150.0, 150.0, 0.0, 150.0, 300.0, 0.0, 
+       250.0, 300.0, 0.0, 250.0, 200.0, 0.0, 
+       200.0, 200.0, 0.0, 200.0, 250.0, 0.0};
+   static GLdouble quad1[4][3] = 
+      {50.0, 150.0, 0.0, 350.0, 150.0, 0.0, 
+      350.0, 200.0, 0.0, 50.0, 200.0, 0.0};
+   static GLdouble quad2[4][3] =
+      {100.0, 100.0, 0.0, 300.0, 100.0, 0.0, 
+       300.0, 350.0, 0.0, 100.0, 350.0, 0.0};
+   static GLdouble tri[3][3] =
+      {200.0, 50.0, 0.0, 250.0, 300.0, 0.0,
+       150.0, 300.0, 0.0};
+ 
+   gluTessProperty(tobj, GLU_TESS_WINDING_RULE, 
+                   currentWinding);
+
+   glNewList(list, GL_COMPILE);
+      gluTessBeginPolygon(tobj, NULL);
+         gluTessBeginContour(tobj);
+         for (i = 0; i < 4; i++)
+            gluTessVertex(tobj, rects[i], rects[i]);
+         gluTessEndContour(tobj);
+         gluTessBeginContour(tobj);
+         for (i = 4; i < 8; i++)
+            gluTessVertex(tobj, rects[i], rects[i]);
+         gluTessEndContour(tobj);
+         gluTessBeginContour(tobj);
+         for (i = 8; i < 12; i++)
+            gluTessVertex(tobj, rects[i], rects[i]);
+         gluTessEndContour(tobj);
+      gluTessEndPolygon(tobj);
+   glEndList();
+
+   glNewList(list+1, GL_COMPILE);
+      gluTessBeginPolygon(tobj, NULL);
+         gluTessBeginContour(tobj);
+         for (i = 0; i < 4; i++)
+            gluTessVertex(tobj, rects[i], rects[i]);
+         gluTessEndContour(tobj);
+         gluTessBeginContour(tobj);
+         for (i = 7; i >= 4; i--)
+            gluTessVertex(tobj, rects[i], rects[i]);
+         gluTessEndContour(tobj);
+         gluTessBeginContour(tobj);
+         for (i = 11; i >= 8; i--)
+            gluTessVertex(tobj, rects[i], rects[i]);
+         gluTessEndContour(tobj);
+      gluTessEndPolygon(tobj);
+   glEndList();
+
+   glNewList(list+2, GL_COMPILE);
+      gluTessBeginPolygon(tobj, NULL);
+         gluTessBeginContour(tobj);
+         for (i = 0; i < 16; i++)
+            gluTessVertex(tobj, spiral[i], spiral[i]);
+         gluTessEndContour(tobj);
+      gluTessEndPolygon(tobj);
+   glEndList();
+
+   glNewList(list+3, GL_COMPILE);
+      gluTessBeginPolygon(tobj, NULL);
+         gluTessBeginContour(tobj);
+         for (i = 0; i < 4; i++)
+            gluTessVertex(tobj, quad1[i], quad1[i]);
+         gluTessEndContour(tobj);
+         gluTessBeginContour(tobj);
+         for (i = 0; i < 4; i++)
+            gluTessVertex(tobj, quad2[i], quad2[i]);
+         gluTessEndContour(tobj);
+         gluTessBeginContour(tobj);
+         for (i = 0; i < 3; i++)
+            gluTessVertex(tobj, tri[i], tri[i]);
+         gluTessEndContour(tobj);
+      gluTessEndPolygon(tobj);
+   glEndList();
+}
+
+void display (void) {
+   glClear(GL_COLOR_BUFFER_BIT);
+   glColor3f(1.0, 1.0, 1.0);
+   glPushMatrix(); 
+   glCallList(list);
+   glTranslatef(0.0, 500.0, 0.0);
+   glCallList(list+1);
+   glTranslatef(500.0, -500.0, 0.0);
+   glCallList(list+2);
+   glTranslatef(0.0, 500.0, 0.0);
+   glCallList(list+3);
+   glPopMatrix(); 
+   glFlush();
+}
+
+void CALLBACK beginCallback(GLenum which)
+{
+   glBegin(which);
+}
+
+void CALLBACK errorCallback(GLenum errorCode)
+{
+   const GLubyte *estring;
+
+   estring = gluErrorString(errorCode);
+   fprintf(stderr, "Tessellation Error: %s\n", estring);
+   exit(0);
+}
+
+void CALLBACK endCallback(void)
+{
+   glEnd();
+}
+
+/*  combineCallback is used to create a new vertex when edges
+ *  intersect.  coordinate location is trivial to calculate,
+ *  but weight[4] may be used to average color, normal, or texture 
+ *  coordinate data.
+ */
+/* ARGSUSED */
+void CALLBACK combineCallback(GLdouble coords[3], GLdouble *data[4],
+                     GLfloat weight[4], GLdouble **dataOut )
+{
+   GLdouble *vertex;
+   vertex = (GLdouble *) malloc(3 * sizeof(GLdouble));
+
+   vertex[0] = coords[0];
+   vertex[1] = coords[1];
+   vertex[2] = coords[2];
+   *dataOut = vertex;
+}
+
+void init(void) 
+{
+   glClearColor(0.0, 0.0, 0.0, 0.0);
+   glShadeModel(GL_FLAT);    
+
+   tobj = gluNewTess();
+   gluTessCallback(tobj, GLU_TESS_VERTEX, 
+                   (GLvoid (CALLBACK*) ()) &glVertex3dv);
+   gluTessCallback(tobj, GLU_TESS_BEGIN, 
+                   (GLvoid (CALLBACK*) ()) &beginCallback);
+   gluTessCallback(tobj, GLU_TESS_END, 
+                   (GLvoid (CALLBACK*) ()) &endCallback);
+   gluTessCallback(tobj, GLU_TESS_ERROR, 
+                   (GLvoid (CALLBACK*) ()) &errorCallback);
+   gluTessCallback(tobj, GLU_TESS_COMBINE, 
+                   (GLvoid (CALLBACK*) ()) &combineCallback);
+
+   list = glGenLists(4);
+   makeNewLists();
+}
+
+void reshape(int w, int h)
+{
+   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   if (w <= h)
+      gluOrtho2D(0.0, 1000.0, 0.0, 1000.0 * (GLdouble)h/(GLdouble)w);
+   else
+      gluOrtho2D(0.0, 1000.0 * (GLdouble)w/(GLdouble)h, 0.0, 1000.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+}
+
+/* ARGSUSED1 */
+void keyboard(unsigned char key, int x, int y)
+{
+   switch (key) {
+      case 'w':
+      case 'W':
+         if (currentWinding == GLU_TESS_WINDING_ODD)
+            currentWinding = GLU_TESS_WINDING_NONZERO;
+         else if (currentWinding == GLU_TESS_WINDING_NONZERO)
+            currentWinding = GLU_TESS_WINDING_POSITIVE;
+         else if (currentWinding == GLU_TESS_WINDING_POSITIVE)
+            currentWinding = GLU_TESS_WINDING_NEGATIVE;
+         else if (currentWinding == GLU_TESS_WINDING_NEGATIVE)
+            currentWinding = GLU_TESS_WINDING_ABS_GEQ_TWO;
+         else if (currentWinding == GLU_TESS_WINDING_ABS_GEQ_TWO)
+            currentWinding = GLU_TESS_WINDING_ODD;
+         makeNewLists();
+         glutPostRedisplay();
+         break;
+      case 27:
+         exit(0);
+         break;
+      default:
+         break;
+   }
+}
+
+int main(int argc, char** argv)
+{
+   glutInit(&argc, argv);
+   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
+   glutInitWindowSize(500, 500);
+   glutCreateWindow(argv[0]);
+   init();
+   glutDisplayFunc(display);
+   glutReshapeFunc(reshape);
+   glutKeyboardFunc(keyboard);
+   glutMainLoop();
+   return 0;  
+}
+
+#else
+int main(int argc, char** argv)
+{
+    fprintf (stderr, "This program demonstrates the new tesselator API in GLU 1.2.\n");
+    fprintf (stderr, "Your GLU library does not support this new interface, sorry.\n");
+    return 0;
+}
+#endif