3146bdbf16
* clutter/clutter-feature.c: No need to call clutter_feature_init() each time: it's private and should never be seen from the outside; add a warning, just in case something screws up and calls it more than once.
115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/*
|
|
* Clutter.
|
|
*
|
|
* An OpenGL based 'interactive canvas' library.
|
|
*
|
|
* Authored By Matthew Allum <mallum@openedhand.com>
|
|
*
|
|
* Copyright (C) 2006 OpenedHand
|
|
*
|
|
* 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 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.
|
|
*/
|
|
|
|
/**
|
|
* SECTION:clutter-feature
|
|
* @short_description: functions to query available GL features ay runtime
|
|
*
|
|
* Functions to query available GL features ay runtime
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "clutter-feature.h"
|
|
#include "string.h"
|
|
|
|
static ClutterFeatureFlags __features = -1;
|
|
|
|
/* Note must be called after context created */
|
|
static gboolean
|
|
check_gl_extension (const gchar *name)
|
|
{
|
|
const gchar *ext;
|
|
gchar *end;
|
|
gint name_len, n;
|
|
|
|
ext = (const gchar*)glGetString(GL_EXTENSIONS);
|
|
|
|
if (name == NULL || ext == NULL)
|
|
return FALSE;
|
|
|
|
end = (gchar*)(ext + strlen(ext));
|
|
|
|
name_len = strlen(name);
|
|
|
|
while (ext < end)
|
|
{
|
|
n = strcspn(ext, " ");
|
|
|
|
if ((name_len == n) && (!strncmp(name, ext, n)))
|
|
return TRUE;
|
|
ext += (n + 1);
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
void
|
|
clutter_feature_init (void)
|
|
{
|
|
if (__features != -1)
|
|
{
|
|
g_warning ("You should never call clutter_feature_init() "
|
|
"more than once.");
|
|
return;
|
|
}
|
|
|
|
__features = 0;
|
|
|
|
if (check_gl_extension ("GL_ARB_texture_rectangle"))
|
|
__features |= CLUTTER_FEATURE_TEXTURE_RECTANGLE;
|
|
}
|
|
|
|
/**
|
|
* clutter_feature_available:
|
|
* @feature: a #ClutterFeatureFlags
|
|
*
|
|
* Checks whether @feature is available. @feature can be a logical
|
|
* OR of #ClutterFeatureFlags.
|
|
*
|
|
* Return value: %TRUE if a feature is available
|
|
*
|
|
* Since: 0.1.1
|
|
*/
|
|
gboolean
|
|
clutter_feature_available (ClutterFeatureFlags feature)
|
|
{
|
|
return (__features & feature);
|
|
}
|
|
|
|
/**
|
|
* clutter_feature_all:
|
|
*
|
|
* Returns all the suppoerted features.
|
|
*
|
|
* Return value: a logical OR of all the supported features.
|
|
*
|
|
* Since: 0.1.1
|
|
*/
|
|
ClutterFeatureFlags
|
|
clutter_feature_all (void)
|
|
{
|
|
return __features;
|
|
}
|