progs/trivial/tri-tex-3d.c

   1 /*
   2  * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that (i) the above copyright notices and this permission notice appear in
   7  * all copies of the software and related documentation, and (ii) the name of
   8  * Silicon Graphics may not be used in any advertising or
   9  * publicity relating to the software without the specific, prior written
  10  * permission of Silicon Graphics.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
  13  * ANY KIND,
  14  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  15  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
  18  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  19  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  20  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  21  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  22  * OF THIS SOFTWARE.
  23  */
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <GL/glew.h>
  29 #include <GL/glut.h>
  30
  31
  32 #define CI_OFFSET_1 16
  33 #define CI_OFFSET_2 32
  34
  35
  36 GLenum doubleBuffer;
  37
  38 static void Init(void)
  39 {
  40    fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
  41    fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
  42    fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
  43    fflush(stderr);
  44
  45    glClearColor(0.0, 0.0, 1.0, 0.0);
  46
  47 #define SIZE 16
  48    {
  49       GLubyte tex3d[SIZE][SIZE][SIZE][3];
  50       GLint r, s, t;
  51
  52       for (s = 0; s < SIZE; s++) {
  53          for (t = 0; t < SIZE; t++) {
  54             for (r = 0; r < SIZE; r++) {
  55 #if 0
  56                tex3d[r][t][s][0] = (s < SIZE/2) ? 0 : 255;
  57                tex3d[r][t][s][1] = (t < SIZE/2) ? 0 : 255;
  58                tex3d[r][t][s][2] = (r < SIZE/2) ? 0 : 255;
  59 #else
  60                tex3d[r][t][s][0] = s*255/(SIZE-1);
  61                tex3d[r][t][s][1] = t*255/(SIZE-1);
  62                tex3d[r][t][s][2] = r*255/(SIZE-1);
  63 #endif
  64             }
  65          }
  66       }
  67
  68       glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
  69       glTexParameterf(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_REPEAT);
  70       glTexParameterf(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  71       glTexParameterf(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  72
  73       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  74       glTexImage3D(GL_TEXTURE_3D, 0, 3, SIZE, SIZE, SIZE, 0,
  75                    GL_RGB, GL_UNSIGNED_BYTE, tex3d);
  76       glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
  77       glEnable(GL_TEXTURE_3D);
  78    }
  79
  80 }
  81
  82 static void Reshape(int width, int height)
  83 {
  84
  85     glViewport(0, 0, (GLint)width, (GLint)height);
  86
  87     glMatrixMode(GL_PROJECTION);
  88     glLoadIdentity();
  89     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  90     glMatrixMode(GL_MODELVIEW);
  91 }
  92
  93 static void Key(unsigned char key, int x, int y)
  94 {
  95
  96     switch (key) {
  97       case 27:
  98         exit(1);
  99       default:
 100         break;
 101     }
 102
 103     glutPostRedisplay();
 104 }
 105
 106 static void Draw(void)
 107 {
 108    glClear(GL_COLOR_BUFFER_BIT);
 109
 110    glBegin(GL_TRIANGLES);
 111    glTexCoord3f( 0,0,.9);
 112    glVertex3f( 0.9, -0.9, -30.0);
 113    glTexCoord3f(.9,0,0);
 114    glVertex3f( 0.9,  0.9, -30.0);
 115    glTexCoord3f(0,.9,0);
 116    glVertex3f(-0.9,  0.0, -30.0);
 117    glEnd();
 118
 119    glFlush();
 120
 121    if (doubleBuffer) {
 122       glutSwapBuffers();
 123    }
 124 }
 125
 126 static GLenum Args(int argc, char **argv)
 127 {
 128     GLint i;
 129
 130     doubleBuffer = GL_FALSE;
 131
 132     for (i = 1; i < argc; i++) {
 133         if (strcmp(argv[i], "-sb") == 0) {
 134             doubleBuffer = GL_FALSE;
 135         } else if (strcmp(argv[i], "-db") == 0) {
 136             doubleBuffer = GL_TRUE;
 137         } else {
 138             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 139             return GL_FALSE;
 140         }
 141     }
 142     return GL_TRUE;
 143 }
 144
 145 int main(int argc, char **argv)
 146 {
 147     GLenum type;
 148
 149     glutInit(&argc, argv);
 150
 151     if (Args(argc, argv) == GL_FALSE) {
 152         exit(1);
 153     }
 154
 155     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 156
 157     type = GLUT_RGB | GLUT_ALPHA;
 158     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 159     glutInitDisplayMode(type);
 160
 161     if (glutCreateWindow(*argv) == GL_FALSE) {
 162         exit(1);
 163     }
 164
 165     glewInit();
 166
 167     Init();
 168
 169     glutReshapeFunc(Reshape);
 170     glutKeyboardFunc(Key);
 171     glutDisplayFunc(Draw);
 172     glutMainLoop();
 173         return 0;
 174 }