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// This file may be redistributed and modified only under the terms of
// the GNU Lesser General Public License (See COPYING for details).
// Copyright (C) 2003-2005 Simon Goodall
#define __glext_h_ 1
#include "GL.h"
#undef __glext_h_
#include <string.h>
#include <sage/utility.h>
/*
* function Taken from OpenGL FAQ
*/
static GLubyte *extensions = NULL;
int isExtensionSupported(const char *extension) {
// const GLubyte *extensions = NULL;
const GLubyte *start;
GLubyte *where, *terminator;
/* Extension names should not have spaces. */
where = (GLubyte *) strchr(extension, ' ');
if (where || *extension == '\0')
return 0;
if (extensions == NULL) extensions = (GLubyte*)glGetString(GL_EXTENSIONS);
if (extensions == NULL) return 0;
/* It takes a bit of care to be fool-proof about parsing the
OpenGL extensions string. Don't be fooled by sub-strings,
etc. */
start = extensions;
for (;;) {
where = (GLubyte*) strstr((const char *) start, extension);
if (!where)
break;
terminator = where + strlen(extension);
if (where == start || *(where - 1) == ' ')
if (*terminator == ' ' || * terminator == '\0')
return 1;
start = terminator;
}
return 0;
}
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