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/* GdkGLExt - OpenGL Extension to GDK
* Copyright (C) 2002-2004 Naofumi Yasufuku
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include <stdlib.h>
#include <string.h>
#include "gdkglprivate.h"
#include "gdkglquery.h"
#ifdef G_OS_WIN32
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>
#endif
#include <GL/gl.h>
/*
* This code is based on glutExtensionSupported().
*/
/**
* gdk_gl_query_gl_extension:
* @extension: name of OpenGL extension.
*
* Determines whether a given OpenGL extension is supported.
*
* There must be a valid current rendering context to call
* gdk_gl_query_gl_extension().
*
* gdk_gl_query_gl_extension() returns information about OpenGL extensions
* only. This means that window system dependent extensions (for example,
* GLX extensions) are not reported by gdk_gl_query_gl_extension().
*
* Return value: TRUE if the OpenGL extension is supported, FALSE if not
* supported.
**/
gboolean
gdk_gl_query_gl_extension (const char *extension)
{
static 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 FALSE;
if (extensions == NULL)
extensions = glGetString (GL_EXTENSIONS);
/* 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 (;;)
{
/* If your application crashes in the strstr routine below,
you are probably calling gdk_gl_query_gl_extension without
having a current window. Calling glGetString without
a current OpenGL context has unpredictable results.
Please fix your program. */
where = (GLubyte *) strstr ((const char *) start, extension);
if (where == NULL)
break;
terminator = where + strlen (extension);
if (where == start || *(where - 1) == ' ')
if (*terminator == ' ' || *terminator == '\0')
{
GDK_GL_NOTE (MISC, g_message (" - %s - supported", extension));
return TRUE;
}
start = terminator;
}
GDK_GL_NOTE (MISC, g_message (" - %s - not supported", extension));
return FALSE;
}
/*< private >*/
void
_gdk_gl_print_gl_info (void)
{
static gboolean done = FALSE;
if (!done)
{
g_message (" -- GL_VENDOR : %s", glGetString (GL_VENDOR));
g_message (" -- GL_RENDERER : %s", glGetString (GL_RENDERER));
g_message (" -- GL_VERSION : %s", glGetString (GL_VERSION));
g_message (" -- GL_EXTENSIONS : %s", glGetString (GL_EXTENSIONS));
done = TRUE;
}
}
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