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/* Copyright (c) Mark J. Kilgard, 1997. */
/* This program is freely distributable without licensing fees
and is provided without guarantee or warrantee expressed or
implied. This program is -not- in the public domain. */
#include <stdlib.h>
#include <string.h>
#include "glutint.h"
#if defined(GLX_VERSION_1_1)
int
__glutIsSupportedByGLX(char *extension)
{
static const char *extensions = NULL;
const char *start;
char *where, *terminator;
int major, minor;
glXQueryVersion(__glutDisplay, &major, &minor);
/* Be careful not to call glXQueryExtensionsString if it
looks like the server doesn't support GLX 1.1.
Unfortunately, the original GLX 1.0 didn't have the notion
of GLX extensions. */
if ((major == 1 && minor >= 1) || (major > 1)) {
if (!extensions)
extensions = glXQueryExtensionsString(__glutDisplay, __glutScreen);
/* It takes a bit of care to be fool-proof about parsing
the GLX extensions string. Don't be fooled by
sub-strings, etc. */
start = extensions;
for (;;) {
where = strstr(start, extension);
if (!where)
return 0;
terminator = where + strlen(extension);
if (where == start || *(where - 1) == ' ') {
if (*terminator == ' ' || *terminator == '\0') {
return 1;
}
}
start = terminator;
}
}
return 0;
}
#endif
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