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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- * Unpublished-- rights reserved under the copyright laws of the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.
- */
-
-/*
- * tess.c
- * This program demonstrates polygon tessellation.
- * Two tesselated objects are drawn. The first is a
- * rectangle with a triangular hole. The second is a
- * smooth shaded, self-intersecting star.
- *
- * Note the exterior rectangle is drawn with its vertices
- * in counter-clockwise order, but its interior clockwise.
- * Note the combineCallback is needed for the self-intersecting
- * star. Also note that removing the TessProperty for the
- * star will make the interior unshaded (WINDING_ODD).
- */
-#include <GL/glut.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-#ifdef GLU_VERSION_1_2
-
-/* Win32 calling conventions. */
-#ifndef CALLBACK
-#define CALLBACK
-#endif
-
-GLuint startList;
-
-static void display (void) {
- glClear(GL_COLOR_BUFFER_BIT);
- glColor3f(1.0, 1.0, 1.0);
- glCallList(startList);
- glCallList(startList + 1);
- glFlush();
-}
-
-static void CALLBACK beginCallback(GLenum which)
-{
- glBegin(which);
-}
-
-static void CALLBACK errorCallback(GLenum errorCode)
-{
- const GLubyte *estring;
-
- estring = gluErrorString(errorCode);
- fprintf(stderr, "Tessellation Error: %s\n", (char *) estring);
- exit(0);
-}
-
-static void CALLBACK endCallback(void)
-{
- glEnd();
-}
-
-static void CALLBACK vertexCallback(GLvoid *vertex)
-{
- const GLdouble *pointer;
-
- pointer = (GLdouble *) vertex;
- glColor3dv(pointer+3);
- glVertex3dv(pointer);
-}
-
-/* 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. In this program, color is weighted.
- */
-static void CALLBACK combineCallback(GLdouble coords[3],
- GLdouble *vertex_data[4],
- GLfloat weight[4], GLdouble **dataOut )
-{
- GLdouble *vertex;
- int i;
-
- vertex = (GLdouble *) malloc(6 * sizeof(GLdouble));
-
- vertex[0] = coords[0];
- vertex[1] = coords[1];
- vertex[2] = coords[2];
- for (i = 3; i < 6; i++)
- vertex[i] = weight[0] * vertex_data[0][i]
- + weight[1] * vertex_data[1][i]
- + weight[2] * vertex_data[2][i]
- + weight[3] * vertex_data[3][i];
- *dataOut = vertex;
-}
-
-static void init (void)
-{
- GLUtesselator *tobj;
- GLdouble rect[4][3] = {{50.0, 50.0, 0.0},
- {200.0, 50.0, 0.0},
- {200.0, 200.0, 0.0},
- {50.0, 200.0, 0.0}};
- GLdouble tri[3][3] = {{75.0, 75.0, 0.0},
- {125.0, 175.0, 0.0},
- {175.0, 75.0, 0.0}};
- GLdouble star[5][6] = {{250.0, 50.0, 0.0, 1.0, 0.0, 1.0},
- {325.0, 200.0, 0.0, 1.0, 1.0, 0.0},
- {400.0, 50.0, 0.0, 0.0, 1.0, 1.0},
- {250.0, 150.0, 0.0, 1.0, 0.0, 0.0},
- {400.0, 150.0, 0.0, 0.0, 1.0, 0.0}};
-
- glClearColor(0.0, 0.0, 0.0, 0.0);
-
- startList = glGenLists(2);
-
- 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);
-
- /* rectangle with triangular hole inside */
- glNewList(startList, GL_COMPILE);
- glShadeModel(GL_FLAT);
- gluTessBeginPolygon(tobj, NULL);
- gluTessBeginContour(tobj);
- gluTessVertex(tobj, rect[0], rect[0]);
- gluTessVertex(tobj, rect[1], rect[1]);
- gluTessVertex(tobj, rect[2], rect[2]);
- gluTessVertex(tobj, rect[3], rect[3]);
- gluTessEndContour(tobj);
- gluTessBeginContour(tobj);
- gluTessVertex(tobj, tri[0], tri[0]);
- gluTessVertex(tobj, tri[1], tri[1]);
- gluTessVertex(tobj, tri[2], tri[2]);
- gluTessEndContour(tobj);
- gluTessEndPolygon(tobj);
- glEndList();
-
- gluTessCallback(tobj, GLU_TESS_VERTEX,
- (GLvoid (CALLBACK*) ()) &vertexCallback);
- 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);
-
- /* smooth shaded, self-intersecting star */
- glNewList(startList + 1, GL_COMPILE);
- glShadeModel(GL_SMOOTH);
- gluTessProperty(tobj, GLU_TESS_WINDING_RULE,
- GLU_TESS_WINDING_POSITIVE);
- gluTessBeginPolygon(tobj, NULL);
- gluTessBeginContour(tobj);
- gluTessVertex(tobj, star[0], star[0]);
- gluTessVertex(tobj, star[1], star[1]);
- gluTessVertex(tobj, star[2], star[2]);
- gluTessVertex(tobj, star[3], star[3]);
- gluTessVertex(tobj, star[4], star[4]);
- gluTessEndContour(tobj);
- gluTessEndPolygon(tobj);
- glEndList();
- gluDeleteTess(tobj);
-}
-
-static void reshape (int w, int h)
-{
- glViewport(0, 0, (GLsizei) w, (GLsizei) h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluOrtho2D(0.0, (GLdouble) w, 0.0, (GLdouble) h);
-}
-
-/* ARGSUSED1 */
-static void keyboard(unsigned char key, int x, int y)
-{
- switch (key) {
- case 27:
- exit(0);
- 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
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