1 2/* Copyright (c) Mark J. Kilgard, 1994. */ 3 4/* 5 * (c) Copyright 1993, Silicon Graphics, Inc. 6 * ALL RIGHTS RESERVED 7 * Permission to use, copy, modify, and distribute this software for 8 * any purpose and without fee is hereby granted, provided that the above 9 * copyright notice appear in all copies and that both the copyright notice 10 * and this permission notice appear in supporting documentation, and that 11 * the name of Silicon Graphics, Inc. not be used in advertising 12 * or publicity pertaining to distribution of the software without specific, 13 * written prior permission. 14 * 15 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" 16 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, 17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR 18 * FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON 19 * GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, 20 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY 21 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, 22 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF 23 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN 24 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON 25 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE 26 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE. 27 * 28 * US Government Users Restricted Rights 29 * Use, duplication, or disclosure by the Government is subject to 30 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph 31 * (c)(1)(ii) of the Rights in Technical Data and Computer Software 32 * clause at DFARS 252.227-7013 and/or in similar or successor 33 * clauses in the FAR or the DOD or NASA FAR Supplement. 34 * Unpublished-- rights reserved under the copyright laws of the 35 * United States. Contractor/manufacturer is Silicon Graphics, 36 * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311. 37 * 38 * OpenGL(TM) is a trademark of Silicon Graphics, Inc. 39 */ 40/* mipmap.c 41 * This program demonstrates using mipmaps for texture maps. 42 * To overtly show the effect of mipmaps, each mipmap reduction 43 * level has a solidly colored, contrasting texture image. 44 * Thus, the quadrilateral which is drawn is drawn with several 45 * different colors. 46 */ 47#include <stdlib.h> 48#include <stdio.h> 49#include <GL/glew.h> 50#include "glut_wrap.h" 51 52GLubyte mipmapImage32[40][46][3]; 53GLubyte mipmapImage16[20][23][3]; 54GLubyte mipmapImage8[10][11][3]; 55GLubyte mipmapImage4[5][5][3]; 56GLubyte mipmapImage2[2][2][3]; 57GLubyte mipmapImage1[1][1][3]; 58 59static void makeImages(void) 60{ 61 int i, j; 62 63 for (i = 0; i < 40; i++) { 64 for (j = 0; j < 46; j++) { 65 mipmapImage32[i][j][0] = 255; 66 mipmapImage32[i][j][1] = 255; 67 mipmapImage32[i][j][2] = 0; 68 } 69 } 70 for (i = 0; i < 20; i++) { 71 for (j = 0; j < 23; j++) { 72 mipmapImage16[i][j][0] = 255; 73 mipmapImage16[i][j][1] = 0; 74 mipmapImage16[i][j][2] = 255; 75 } 76 } 77 for (i = 0; i < 10; i++) { 78 for (j = 0; j < 11; j++) { 79 mipmapImage8[i][j][0] = 255; 80 mipmapImage8[i][j][1] = 0; 81 mipmapImage8[i][j][2] = 0; 82 } 83 } 84 for (i = 0; i < 5; i++) { 85 for (j = 0; j < 5; j++) { 86 mipmapImage4[i][j][0] = 0; 87 mipmapImage4[i][j][1] = 255; 88 mipmapImage4[i][j][2] = 0; 89 } 90 } 91 for (i = 0; i < 2; i++) { 92 for (j = 0; j < 2; j++) { 93 mipmapImage2[i][j][0] = 0; 94 mipmapImage2[i][j][1] = 0; 95 mipmapImage2[i][j][2] = 255; 96 } 97 } 98 mipmapImage1[0][0][0] = 255; 99 mipmapImage1[0][0][1] = 255; 100 mipmapImage1[0][0][2] = 255; 101} 102 103static void myinit(void) 104{ 105 if (!glutExtensionSupported("GL_ARB_texture_non_power_of_two")) { 106 printf("Sorry, this program requires GL_ARB_texture_non_power_of_two\n"); 107 exit(1); 108 } 109 110 glEnable(GL_DEPTH_TEST); 111 glDepthFunc(GL_LESS); 112 glShadeModel(GL_FLAT); 113 114 glTranslatef(0.0, 0.0, -3.6); 115 makeImages(); 116 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 117 glTexImage2D(GL_TEXTURE_2D, 0, 3, 40, 46, 0, 118 GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage32[0][0][0]); 119 glTexImage2D(GL_TEXTURE_2D, 1, 3, 20, 23, 0, 120 GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage16[0][0][0]); 121 glTexImage2D(GL_TEXTURE_2D, 2, 3, 10, 11, 0, 122 GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage8[0][0][0]); 123 glTexImage2D(GL_TEXTURE_2D, 3, 3, 5, 5, 0, 124 GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage4[0][0][0]); 125 glTexImage2D(GL_TEXTURE_2D, 4, 3, 2, 2, 0, 126 GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage2[0][0][0]); 127 glTexImage2D(GL_TEXTURE_2D, 5, 3, 1, 1, 0, 128 GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage1[0][0][0]); 129 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); 130 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); 131 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 132 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, 133 GL_NEAREST_MIPMAP_NEAREST); 134 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); 135 glEnable(GL_TEXTURE_2D); 136} 137 138static void display(void) 139{ 140 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 141 glBegin(GL_QUADS); 142 glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0); 143 glTexCoord2f(0.0, 8.0); glVertex3f(-2.0, 1.0, 0.0); 144 glTexCoord2f(8.0, 8.0); glVertex3f(2000.0, 1.0, -6000.0); 145 glTexCoord2f(8.0, 0.0); glVertex3f(2000.0, -1.0, -6000.0); 146 glEnd(); 147 glFlush(); 148} 149 150static void myReshape(int w, int h) 151{ 152 glViewport(0, 0, w, h); 153 glMatrixMode(GL_PROJECTION); 154 glLoadIdentity(); 155 gluPerspective(60.0, 1.0*(GLfloat)w/(GLfloat)h, 1.0, 30000.0); 156 glMatrixMode(GL_MODELVIEW); 157 glLoadIdentity(); 158} 159 160static void 161key(unsigned char k, int x, int y) 162{ 163 switch (k) { 164 case 27: /* Escape */ 165 exit(0); 166 break; 167 default: 168 return; 169 } 170 glutPostRedisplay(); 171} 172 173int main(int argc, char** argv) 174{ 175 glutInit(&argc, argv); 176 glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); 177 glutInitWindowSize (500, 500); 178 glutCreateWindow (argv[0]); 179 glewInit(); 180 myinit(); 181 glutReshapeFunc (myReshape); 182 glutDisplayFunc(display); 183 glutKeyboardFunc(key); 184 glutMainLoop(); 185 return 0; /* ANSI C requires main to return int. */ 186} 187