src/redbook/texture3d.c

   1 /*
   2  * Copyright (c) 1993-2003, Silicon Graphics, Inc.
   3  * All Rights Reserved
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose and without fee is hereby granted, provided that the above
   7  * copyright notice appear in all copies and that both the copyright
   8  * notice and this permission notice appear in supporting documentation,
   9  * and that the name of Silicon Graphics, Inc. not be used in
  10  * advertising or publicity pertaining to distribution of the software
  11  * without specific, written prior permission.
  12  *
  13  * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" AND
  14  * WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
  16  * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
  17  * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
  18  * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  19  * OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, LOSS OF
  20  * PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF THIRD
  21  * PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN ADVISED OF
  22  * THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON ANY THEORY OF
  23  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE POSSESSION, USE
  24  * OR PERFORMANCE OF THIS SOFTWARE.
  25  *
  26  * US Government Users Restricted Rights
  27  * Use, duplication, or disclosure by the Government is subject to
  28  * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
  29  * (c)(1)(ii) of the Rights in Technical Data and Computer Software
  30  * clause at DFARS 252.227-7013 and/or in similar or successor clauses
  31  * in the FAR or the DOD or NASA FAR Supplement.  Unpublished - rights
  32  * reserved under the copyright laws of the United States.
  33  *
  34  * Contractor/manufacturer is:
  35  *      Silicon Graphics, Inc.
  36  *      1500 Crittenden Lane
  37  *      Mountain View, CA  94043
  38  *      United State of America
  39  *
  40  * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
  41  */
  42
  43 /*  texture3d.c
  44  *  This program demonstrates using a three-dimensional texture.
  45  *  It creates a 3D texture and then renders two rectangles
  46  *  with different texture coordinates to obtain different
  47  *  "slices" of the 3D texture.
  48  */
  49 #include <GL/glew.h>
  50 #include <GL/glut.h>
  51 #include <stdlib.h>
  52 #include <stdio.h>
  53
  54 #ifdef GL_VERSION_1_2
  55 #define iWidth 16
  56 #define iHeight 16
  57 #define iDepth 16
  58
  59 static GLubyte image[iDepth][iHeight][iWidth][3];
  60 static GLuint texName;
  61
  62 /*  Create a 16x16x16x3 array with different color values in
  63  *  each array element [r, g, b].  Values range from 0 to 255.
  64  */
  65
  66 static void makeImage(void)
  67 {
  68    int s, t, r;
  69
  70    for (s = 0; s < 16; s++)
  71       for (t = 0; t < 16; t++)
  72          for (r = 0; r < 16; r++) {
  73             image[r][t][s][0] = (GLubyte) (s * 17);
  74             image[r][t][s][1] = (GLubyte) (t * 17);
  75             image[r][t][s][2] = (GLubyte) (r * 17);
  76          }
  77 }
  78
  79 static void init(void)
  80 {
  81    glClearColor (0.0, 0.0, 0.0, 0.0);
  82    glShadeModel(GL_FLAT);
  83    glEnable(GL_DEPTH_TEST);
  84
  85    makeImage();
  86    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  87
  88    glGenTextures(1, &texName);
  89    glBindTexture(GL_TEXTURE_3D, texName);
  90    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP);
  91    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP);
  92    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP);
  93    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER,
  94                    GL_NEAREST);
  95    glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER,
  96                    GL_NEAREST);
  97    glTexImage3D(GL_TEXTURE_3D, 0, GL_RGB, iWidth, iHeight,
  98                 iDepth, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
  99    glEnable(GL_TEXTURE_3D);
 100 }
 101
 102 static void display(void)
 103 {
 104    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 105    glBegin(GL_QUADS);
 106    glTexCoord3f(0.0, 0.0, 0.0); glVertex3f(-2.25, -1.0, 0.0);
 107    glTexCoord3f(0.0, 1.0, 0.0); glVertex3f(-2.25, 1.0, 0.0);
 108    glTexCoord3f(1.0, 1.0, 1.0); glVertex3f(-0.25, 1.0, 0.0);
 109    glTexCoord3f(1.0, 0.0, 1.0); glVertex3f(-0.25, -1.0, 0.0);
 110
 111    glTexCoord3f(0.0, 0.0, 1.0); glVertex3f(0.25, -1.0, 0.0);
 112    glTexCoord3f(0.0, 1.0, 1.0); glVertex3f(0.25, 1.0, 0.0);
 113    glTexCoord3f(1.0, 1.0, 0.0); glVertex3f(2.25, 1.0, 0.0);
 114    glTexCoord3f(1.0, 0.0, 0.0); glVertex3f(2.25, -1.0, 0.0);
 115    glEnd();
 116    glFlush();
 117 }
 118
 119 static void reshape(int w, int h)
 120 {
 121    glViewport(0, 0, (GLsizei) w, (GLsizei) h);
 122    glMatrixMode(GL_PROJECTION);
 123    glLoadIdentity();
 124    gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 30.0);
 125    glMatrixMode(GL_MODELVIEW);
 126    glLoadIdentity();
 127    glTranslatef(0.0, 0.0, -4.0);
 128 }
 129
 130 static void keyboard(unsigned char key, int x, int y)
 131 {
 132    switch (key) {
 133       case 27:
 134          exit(0);
 135          break;
 136    }
 137 }
 138
 139 int main(int argc, char** argv)
 140 {
 141    glutInit(&argc, argv);
 142    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
 143    glutInitWindowSize(250, 250);
 144    glutInitWindowPosition(100, 100);
 145    glutCreateWindow(argv[0]);
 146    glewInit();
 147    init();
 148    glutReshapeFunc(reshape);
 149    glutDisplayFunc(display);
 150    glutKeyboardFunc (keyboard);
 151    glutMainLoop();
 152    return 0;
 153 }
 154 #else
 155 int main(int argc, char** argv)
 156 {
 157     fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0 or 1.1.\n");
 158     fprintf (stderr, "If your implementation of OpenGL has the right extensions,\n");
 159     fprintf (stderr, "you may be able to modify this program to make it run.\n");
 160     return 0;
 161 }
 162 #endif
 163