texprox.c
上传用户:xk288cn
上传日期:2007-05-28
资源大小:4876k
文件大小:4k
- /*
- * Copyright (c) 1993-1997, 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- * Unpublished-- rights reserved under the copyright laws of the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 <GL/glut.h>
- #include <stdlib.h>
- #include <stdio.h>
- #ifdef GL_VERSION_1_1
- /* Microsoft OpenGL 1.1's <GL/gl.h> forgets to define
- GL_TEXTURE_INTERNAL_FORMAT. */
- #ifndef GL_TEXTURE_INTERNAL_FORMAT
- #define GL_TEXTURE_INTERNAL_FORMAT GL_TEXTURE_COMPONENTS
- #endif
- void init(void)
- {
- GLint proxyComponents;
- putchar('n');
- 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_INTERNAL_FORMAT, &proxyComponents);
- printf ("Proxying 64x64 level 0 RGBA8 texture (level 0)n");
- if (proxyComponents == GL_RGBA8)
- printf ("proxy allocation succeededn");
- else
- printf ("proxy allocation failedn");
- putchar('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_INTERNAL_FORMAT, &proxyComponents);
- printf ("Proxying 2048x2048 level 0 RGBA16 texture (big so unlikely to be supported)n");
- if (proxyComponents == GL_RGBA16)
- printf ("proxy allocation succeededn");
- else
- printf ("proxy allocation failedn");
- putchar('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