lxdream 0.9.1| filename | src/pvr2/glutil.c |
| changeset | 667:0e1ac8da75d9 |
| prev | 653:3202ff01d48e |
| next | 687:6bdc2b7032ea |
| author | nkeynes |
| date | Mon May 12 10:00:13 2008 +0000 (15 years ago) |
| permissions | -rw-r--r-- |
| last change | Cleanup most of the -Wall warnings (getting a bit sloppy...) Convert FP code to use fixed banks rather than indirect pointer (3-4% faster this way now) |
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1 /**
2 * $Id$
3 *
4 * GL-based support functions
5 *
6 * Copyright (c) 2005 Nathan Keynes.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18 #include <string.h>
19 #include "pvr2/glutil.h"
21 gboolean isGLSecondaryColorSupported()
22 {
23 return isGLExtensionSupported("GL_EXT_secondary_color");
24 }
26 gboolean isGLVertexBufferSupported()
27 {
28 return isGLExtensionSupported("GL_ARB_vertex_buffer_object");
29 }
31 gboolean isGLPixelBufferSupported()
32 {
33 return isGLExtensionSupported("GL_ARB_pixel_buffer_object");
34 }
36 gboolean isGLMirroredTextureSupported()
37 {
38 return isGLExtensionSupported("GL_ARB_texture_mirrored_repeat");
39 }
41 /**
42 * Test if a specific extension is supported. From opengl.org
43 * @param extension extension name to check for
44 * @return TRUE if supported, otherwise FALSE.
45 */
46 gboolean isGLExtensionSupported( const char *extension )
47 {
48 const GLubyte *extensions = NULL;
49 const GLubyte *start;
50 GLubyte *where, *terminator;
52 /* Extension names should not have spaces. */
53 where = (GLubyte *) strchr(extension, ' ');
54 if (where || *extension == '\0')
55 return 0;
56 extensions = glGetString(GL_EXTENSIONS);
57 if( extensions == NULL ) {
58 /* No GL available, so we're pretty sure the extension isn't
59 * available either. */
60 return FALSE;
61 }
62 /* It takes a bit of care to be fool-proof about parsing the
63 OpenGL extensions string. Don't be fooled by sub-strings,
64 etc. */
65 start = extensions;
66 for (;;) {
67 where = (GLubyte *) strstr((const char *) start, extension);
68 if (!where)
69 break;
70 terminator = where + strlen(extension);
71 if (where == start || *(where - 1) == ' ')
72 if (*terminator == ' ' || *terminator == '\0')
73 return TRUE;
74 start = terminator;
75 }
76 return FALSE;
77 }
.