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