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at DFARS 252.227-7013 and/or in similar or successor 33 * clauses in the FAR or the DOD or NASA FAR Supplement. 34 * Unpublished-- rights reserved under the copyright laws of the 35 * United States.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 "glut_wrap.h" 49 50GLubyte mipmapImage32[32][32][3]; 51GLubyte mipmapImage16[16][16][3]; 52GLubyte mipmapImage8[8][8][3]; 53GLubyte mipmapImage4[4][4][3]; 54GLubyte mipmapImage2[2][2][3]; 55GLubyte mipmapImage1[1][1][3]; 56 57static void makeImages(void) 58{ 59 int i, j; 60 61 for (i = 0; i < 32; i++) { 62 for (j = 0; j < 32; j++) { 63 mipmapImage32[i][j][0] = 255; 64 mipmapImage32[i][j][1] = 255; 65 mipmapImage32[i][j][2] = 0; 66 } 67 } 68 for (i = 0; i < 16; i++) { 69 for (j = 0; j < 16; j++) { 70 mipmapImage16[i][j][0] = 255; 71 mipmapImage16[i][j][1] = 0; 72 mipmapImage16[i][j][2] = 255; 73 } 74 } 75 for (i = 0; i < 8; i++) { 76 for (j = 0; j < 8; j++) { 77 mipmapImage8[i][j][0] = 255; 78 mipmapImage8[i][j][1] = 0; 79 mipmapImage8[i][j][2] = 0; 80 } 81 } 82 for (i = 0; i < 4; i++) { 83 for (j = 0; j < 4; j++) { 84 mipmapImage4[i][j][0] = 0; 85 mipmapImage4[i][j][1] = 255; 86 mipmapImage4[i][j][2] = 0; 87 } 88 } 89 for (i = 0; i < 2; i++) { 90 for (j = 0; j < 2; j++) { 91 mipmapImage2[i][j][0] = 0; 92 mipmapImage2[i][j][1] = 0; 93 mipmapImage2[i][j][2] = 255; 94 } 95 } 96 mipmapImage1[0][0][0] = 255; 97 mipmapImage1[0][0][1] = 255; 98 mipmapImage1[0][0][2] = 255; 99} 100 101static void myinit(void) 102{ 103 glEnable(GL_DEPTH_TEST); 104 glDepthFunc(GL_LESS); 105 glShadeModel(GL_FLAT); 106 107 glTranslatef(0.0, 0.0, -3.6); 108 makeImages(); 109 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 110 glTexImage2D(GL_TEXTURE_2D, 0, 3, 32, 32, 0, 111 GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage32[0][0][0]); 112 glTexImage2D(GL_TEXTURE_2D, 1, 3, 16, 16, 0, 113 GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage16[0][0][0]); 114 glTexImage2D(GL_TEXTURE_2D, 2, 3, 8, 8, 0, 115 GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage8[0][0][0]); 116 glTexImage2D(GL_TEXTURE_2D, 3, 3, 4, 4, 0, 117 GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage4[0][0][0]); 118 glTexImage2D(GL_TEXTURE_2D, 4, 3, 2, 2, 0, 119 GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage2[0][0][0]); 120 glTexImage2D(GL_TEXTURE_2D, 5, 3, 1, 1, 0, 121 GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage1[0][0][0]); 122 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); 123 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); 124 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 125 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, 126 GL_NEAREST_MIPMAP_NEAREST); 127 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); 128 glEnable(GL_TEXTURE_2D); 129} 130 131static void display(void) 132{ 133 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 134 glBegin(GL_QUADS); 135 glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0); 136 glTexCoord2f(0.0, 8.0); glVertex3f(-2.0, 1.0, 0.0); 137 glTexCoord2f(8.0, 8.0); glVertex3f(2000.0, 1.0, -6000.0); 138 glTexCoord2f(8.0, 0.0); glVertex3f(2000.0, -1.0, -6000.0); 139 glEnd(); 140 glFlush(); 141} 142 143static void myReshape(int w, int h) 144{ 145 glViewport(0, 0, w, h); 146 glMatrixMode(GL_PROJECTION); 147 glLoadIdentity(); 148 gluPerspective(60.0, 1.0*(GLfloat)w/(GLfloat)h, 1.0, 30000.0); 149 glMatrixMode(GL_MODELVIEW); 150 glLoadIdentity(); 151} 152 153static void 154key(unsigned char k, int x, int y) 155{ 156 switch (k) { 157 case 27: /* Escape */ 158 exit(0); 159 break; 160 default: 161 return; 162 } 163 glutPostRedisplay(); 164} 165 166int main(int argc, char** argv) 167{ 168 glutInit(&argc, argv); 169 glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); 170 glutInitWindowSize (500, 500); 171 glutCreateWindow (argv[0]); 172 myinit(); 173 glutReshapeFunc (myReshape); 174 glutDisplayFunc(display); 175 glutKeyboardFunc(key); 176 glutMainLoop(); 177 return 0; /* ANSI C requires main to return int. */ 178} 179