progs/redbook/texprox.c

   1 /*
   2  * Copyright (c) 1993-1997, Silicon Graphics, Inc.
   3  * ALL RIGHTS RESERVED
   4  * Permission to use, copy, modify, and distribute this software for
   5  * any purpose and without fee is hereby granted, provided that the above
   6  * copyright notice appear in all copies and that both the copyright notice
   7  * and this permission notice appear in supporting documentation, and that
   8  * the name of Silicon Graphics, Inc. not be used in advertising
   9  * or publicity pertaining to distribution of the software without specific,
  10  * written prior permission.
  11  *
  12  * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
  13  * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
  14  * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
  15  * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
  16  * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
  17  * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
  18  * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
  19  * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
  20  * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
  21  * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
  22  * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
  23  * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
  24  *
  25  * US Government Users Restricted Rights
  26  * Use, duplication, or disclosure by the Government is subject to
  27  * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
  28  * (c)(1)(ii) of the Rights in Technical Data and Computer Software
  29  * clause at DFARS 252.227-7013 and/or in similar or successor
  30  * clauses in the FAR or the DOD or NASA FAR Supplement.
  31  * Unpublished-- rights reserved under the copyright laws of the
  32  * United States.  Contractor/manufacturer is Silicon Graphics,
  33  * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
  34  *
  35  * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
  36  */
  37
  38 /*
  39  *  texprox.c
  40  *  The brief program illustrates use of texture proxies.
  41  *  This program only prints out some messages about whether
  42  *  certain size textures are supported and then exits.
  43  */
  44 #include <GL/glut.h>
  45 #include <stdlib.h>
  46 #include <stdio.h>
  47
  48 #ifdef GL_VERSION_1_1
  49
  50 /* Microsoft OpenGL 1.1's <GL/gl.h> forgets to define
  51    GL_TEXTURE_INTERNAL_FORMAT. */
  52 #ifndef GL_TEXTURE_INTERNAL_FORMAT
  53 #define GL_TEXTURE_INTERNAL_FORMAT GL_TEXTURE_COMPONENTS
  54 #endif
  55
  56 void init(void)
  57 {
  58    GLint proxyComponents;
  59
  60    putchar('\n');
  61
  62    glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGBA8,
  63                 64, 64, 0,
  64                 GL_RGBA, GL_UNSIGNED_BYTE, NULL);
  65    glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0,
  66                             GL_TEXTURE_INTERNAL_FORMAT, &proxyComponents);
  67    printf ("Proxying 64x64 level 0 RGBA8 texture (level 0)\n");
  68    if (proxyComponents == GL_RGBA8)
  69       printf ("proxy allocation succeeded\n");
  70    else
  71       printf ("proxy allocation failed\n");
  72    putchar('\n');
  73
  74    glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGBA16,
  75                 2048, 2048, 0,
  76                 GL_RGBA, GL_UNSIGNED_SHORT, NULL);
  77    glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0,
  78                             GL_TEXTURE_INTERNAL_FORMAT, &proxyComponents);
  79    printf ("Proxying 2048x2048 level 0 RGBA16 texture (big so unlikely to be supported)\n");
  80    if (proxyComponents == GL_RGBA16)
  81       printf ("proxy allocation succeeded\n");
  82    else
  83       printf ("proxy allocation failed\n");
  84    putchar('\n');
  85 }
  86
  87 void display(void)
  88 {
  89    exit(0);
  90 }
  91
  92 void reshape (int w, int h)
  93 {
  94    glViewport (0, 0, (GLsizei) w, (GLsizei) h);
  95    glMatrixMode (GL_PROJECTION);
  96    glLoadIdentity ();
  97 }
  98
  99 int main(int argc, char** argv)
 100 {
 101    glutInit(&argc, argv);
 102    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
 103    glutInitWindowSize (500, 500);
 104    glutInitWindowPosition (100, 100);
 105    glutCreateWindow (argv[0]);
 106    init ();
 107    glutDisplayFunc(display);
 108    glutReshapeFunc(reshape);
 109    glutMainLoop();
 110    return 0;
 111 }
 112 #else
 113 int main(int argc, char** argv)
 114 {
 115     fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0.\n");
 116     fprintf (stderr, "If your implementation of OpenGL Version 1.0 has the right extensions,\n");
 117     fprintf (stderr, "you may be able to modify this program to make it run.\n");
 118     return 0;
 119 }
 120 #endif