www.pudn.com > openglbk.rar > texprox.c

/* 
 * Copyright (c) 1993-1999, Silicon Graphics, Inc. 
 * ALL RIGHTS RESERVED  
 * Permission to use, copy, modify, and distribute this software for  
 * any purpose and without fee is hereby granted, provided that the above 
 * copyright notice appear in all copies and that both the copyright notice 
 * and this permission notice appear in supporting documentation, and that  
 * the name of Silicon Graphics, Inc. not be used in advertising 
 * or publicity pertaining to distribution of the software without specific, 
 * written prior permission.  
 * 
 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" 
 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR 
 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON 
 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, 
 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY 
 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, 
 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF 
 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN 
 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON 
 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE 
 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE. 
 *  
 * US Government Users Restricted Rights  
 * Use, duplication, or disclosure by the Government is subject to 
 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph 
 * (c)(1)(ii) of the Rights in Technical Data and Computer Software 
 * clause at DFARS 252.227-7013 and/or in similar or successor 
 * clauses in the FAR or the DOD or NASA FAR Supplement. 
 * Unpublished-- rights reserved under the copyright laws of the 
 * United States.  Contractor/manufacturer is Silicon Graphics, 
 * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311. 
 * 
 * OpenGL(R) is a registered trademark of Silicon Graphics, Inc. 
 */ 
 
/* 
 *  texprox.c 
 *  The brief program illustrates use of texture proxies. 
 *  This program only prints out some messages about whether 
 *  certain size textures are supported and then exits. 
 */ 
#include  
#include  
#include  
 
#ifdef GL_VERSION_1_1 
void init(void)  
{ 
   GLint proxyComponents; 
 
   glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGBA8, 
                64, 64, 0, 
                GL_RGBA, GL_UNSIGNED_BYTE, NULL); 
   glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0,  
                            GL_TEXTURE_COMPONENTS, &proxyComponents); 
   printf ("proxyComponents are %d\n", proxyComponents); 
   if (proxyComponents == GL_RGBA8) 
      printf ("proxy allocation succeeded\n"); 
   else 
      printf ("proxy allocation failed\n"); 
 
   glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGBA16, 
                2048, 2048, 0, 
                GL_RGBA, GL_UNSIGNED_SHORT, NULL); 
   glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0,  
                            GL_TEXTURE_COMPONENTS, &proxyComponents); 
   printf ("proxyComponents are %d\n", proxyComponents); 
   if (proxyComponents == GL_RGBA16) 
      printf ("proxy allocation succeeded\n"); 
   else 
      printf ("proxy allocation failed\n"); 
} 
 
void display(void) 
{ 
   exit(0); 
} 
 
void reshape (int w, int h) 
{ 
   glViewport (0, 0, (GLsizei) w, (GLsizei) h);  
   glMatrixMode (GL_PROJECTION); 
   glLoadIdentity (); 
} 
 
int main(int argc, char** argv) 
{ 
   glutInit(&argc, argv); 
   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); 
   glutInitWindowSize (500, 500);  
   glutInitWindowPosition (100, 100); 
   glutCreateWindow (argv[0]); 
   init (); 
   glutDisplayFunc(display);  
   glutReshapeFunc(reshape); 
   glutMainLoop(); 
   return 0; 
} 
#else 
int main(int argc, char** argv) 
{ 
    fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0.\n"); 
    fprintf (stderr, "If your implementation of OpenGL Version 1.0 has the right extensions,\n"); 
    fprintf (stderr, "you may be able to modify this program to make it run.\n"); 
    return 0; 
} 
#endif