filename | src/pvr2/glutil.c |
changeset | 653:3202ff01d48e |
next | 667:0e1ac8da75d9 |
author | nkeynes |
date | Fri Mar 28 12:32:25 2008 +0000 (16 years ago) |
permissions | -rw-r--r-- |
last change | Merge lxdream-render branch (643:670) to trunk |
file | annotate | diff | log | raw |
nkeynes@653 | 1 | /** |
nkeynes@653 | 2 | * $Id$ |
nkeynes@653 | 3 | * |
nkeynes@653 | 4 | * GL-based support functions |
nkeynes@653 | 5 | * |
nkeynes@653 | 6 | * Copyright (c) 2005 Nathan Keynes. |
nkeynes@653 | 7 | * |
nkeynes@653 | 8 | * This program is free software; you can redistribute it and/or modify |
nkeynes@653 | 9 | * it under the terms of the GNU General Public License as published by |
nkeynes@653 | 10 | * the Free Software Foundation; either version 2 of the License, or |
nkeynes@653 | 11 | * (at your option) any later version. |
nkeynes@653 | 12 | * |
nkeynes@653 | 13 | * This program is distributed in the hope that it will be useful, |
nkeynes@653 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
nkeynes@653 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
nkeynes@653 | 16 | * GNU General Public License for more details. |
nkeynes@653 | 17 | */ |
nkeynes@653 | 18 | #include <string.h> |
nkeynes@653 | 19 | #include "pvr2/glutil.h" |
nkeynes@653 | 20 | |
nkeynes@653 | 21 | /** |
nkeynes@653 | 22 | * Test if a specific extension is supported. From opengl.org |
nkeynes@653 | 23 | * @param extension extension name to check for |
nkeynes@653 | 24 | * @return TRUE if supported, otherwise FALSE. |
nkeynes@653 | 25 | */ |
nkeynes@653 | 26 | gboolean isGLExtensionSupported( const char *extension ) |
nkeynes@653 | 27 | { |
nkeynes@653 | 28 | const GLubyte *extensions = NULL; |
nkeynes@653 | 29 | const GLubyte *start; |
nkeynes@653 | 30 | GLubyte *where, *terminator; |
nkeynes@653 | 31 | |
nkeynes@653 | 32 | /* Extension names should not have spaces. */ |
nkeynes@653 | 33 | where = (GLubyte *) strchr(extension, ' '); |
nkeynes@653 | 34 | if (where || *extension == '\0') |
nkeynes@653 | 35 | return 0; |
nkeynes@653 | 36 | extensions = glGetString(GL_EXTENSIONS); |
nkeynes@653 | 37 | if( extensions == NULL ) { |
nkeynes@653 | 38 | /* No GL available, so we're pretty sure the extension isn't |
nkeynes@653 | 39 | * available either. */ |
nkeynes@653 | 40 | return FALSE; |
nkeynes@653 | 41 | } |
nkeynes@653 | 42 | /* It takes a bit of care to be fool-proof about parsing the |
nkeynes@653 | 43 | OpenGL extensions string. Don't be fooled by sub-strings, |
nkeynes@653 | 44 | etc. */ |
nkeynes@653 | 45 | start = extensions; |
nkeynes@653 | 46 | for (;;) { |
nkeynes@653 | 47 | where = (GLubyte *) strstr((const char *) start, extension); |
nkeynes@653 | 48 | if (!where) |
nkeynes@653 | 49 | break; |
nkeynes@653 | 50 | terminator = where + strlen(extension); |
nkeynes@653 | 51 | if (where == start || *(where - 1) == ' ') |
nkeynes@653 | 52 | if (*terminator == ' ' || *terminator == '\0') |
nkeynes@653 | 53 | return TRUE; |
nkeynes@653 | 54 | start = terminator; |
nkeynes@653 | 55 | } |
nkeynes@653 | 56 | return FALSE; |
nkeynes@653 | 57 | } |
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