187 lines
6.0 KiB
C
187 lines
6.0 KiB
C
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/* Copyright (c) Mark J. Kilgard, 1994. */
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/*
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* (c) Copyright 1993, 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(TM) is a trademark of Silicon Graphics, Inc.
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*/
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/* mipmap.c
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* This program demonstrates using mipmaps for texture maps.
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* To overtly show the effect of mipmaps, each mipmap reduction
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* level has a solidly colored, contrasting texture image.
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* Thus, the quadrilateral which is drawn is drawn with several
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* different colors.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <GL/glew.h>
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#include <GL/glut.h>
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GLubyte mipmapImage32[40][46][3];
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GLubyte mipmapImage16[20][23][3];
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GLubyte mipmapImage8[10][11][3];
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GLubyte mipmapImage4[5][5][3];
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GLubyte mipmapImage2[2][2][3];
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GLubyte mipmapImage1[1][1][3];
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static void makeImages(void)
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{
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int i, j;
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for (i = 0; i < 40; i++) {
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for (j = 0; j < 46; j++) {
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mipmapImage32[i][j][0] = 255;
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mipmapImage32[i][j][1] = 255;
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mipmapImage32[i][j][2] = 0;
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}
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}
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for (i = 0; i < 20; i++) {
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for (j = 0; j < 23; j++) {
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mipmapImage16[i][j][0] = 255;
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mipmapImage16[i][j][1] = 0;
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mipmapImage16[i][j][2] = 255;
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}
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}
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for (i = 0; i < 10; i++) {
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for (j = 0; j < 11; j++) {
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mipmapImage8[i][j][0] = 255;
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mipmapImage8[i][j][1] = 0;
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mipmapImage8[i][j][2] = 0;
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}
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}
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for (i = 0; i < 5; i++) {
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for (j = 0; j < 5; j++) {
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mipmapImage4[i][j][0] = 0;
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mipmapImage4[i][j][1] = 255;
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mipmapImage4[i][j][2] = 0;
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}
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}
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for (i = 0; i < 2; i++) {
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for (j = 0; j < 2; j++) {
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mipmapImage2[i][j][0] = 0;
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mipmapImage2[i][j][1] = 0;
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mipmapImage2[i][j][2] = 255;
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}
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}
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mipmapImage1[0][0][0] = 255;
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mipmapImage1[0][0][1] = 255;
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mipmapImage1[0][0][2] = 255;
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}
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static void myinit(void)
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{
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if (!glutExtensionSupported("GL_ARB_texture_non_power_of_two")) {
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printf("Sorry, this program requires GL_ARB_texture_non_power_of_two\n");
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exit(1);
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}
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glEnable(GL_DEPTH_TEST);
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glDepthFunc(GL_LESS);
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glShadeModel(GL_FLAT);
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glTranslatef(0.0, 0.0, -3.6);
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makeImages();
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glTexImage2D(GL_TEXTURE_2D, 0, 3, 40, 46, 0,
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GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage32[0][0][0]);
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glTexImage2D(GL_TEXTURE_2D, 1, 3, 20, 23, 0,
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GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage16[0][0][0]);
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glTexImage2D(GL_TEXTURE_2D, 2, 3, 10, 11, 0,
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GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage8[0][0][0]);
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glTexImage2D(GL_TEXTURE_2D, 3, 3, 5, 5, 0,
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GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage4[0][0][0]);
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glTexImage2D(GL_TEXTURE_2D, 4, 3, 2, 2, 0,
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GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage2[0][0][0]);
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glTexImage2D(GL_TEXTURE_2D, 5, 3, 1, 1, 0,
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GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage1[0][0][0]);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
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GL_NEAREST_MIPMAP_NEAREST);
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
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glEnable(GL_TEXTURE_2D);
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}
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static void display(void)
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glBegin(GL_QUADS);
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glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0);
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glTexCoord2f(0.0, 8.0); glVertex3f(-2.0, 1.0, 0.0);
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glTexCoord2f(8.0, 8.0); glVertex3f(2000.0, 1.0, -6000.0);
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glTexCoord2f(8.0, 0.0); glVertex3f(2000.0, -1.0, -6000.0);
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glEnd();
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glFlush();
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}
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static void myReshape(int w, int h)
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{
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluPerspective(60.0, 1.0*(GLfloat)w/(GLfloat)h, 1.0, 30000.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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static void
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key(unsigned char k, int x, int y)
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{
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switch (k) {
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case 27: /* Escape */
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exit(0);
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break;
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default:
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return;
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}
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glutPostRedisplay();
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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 | GLUT_DEPTH);
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glutInitWindowSize (500, 500);
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glutCreateWindow (argv[0]);
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glewInit();
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myinit();
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glutReshapeFunc (myReshape);
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glutDisplayFunc(display);
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glutKeyboardFunc(key);
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glutMainLoop();
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return 0; /* ANSI C requires main to return int. */
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}
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