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/*
* 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, see <http://www.gnu.org/licenses/>.
*
*
*/
/**
* SECTION:clutter-feature
* @short_description: Run-time detection of Clutter features
*
* Parts of Clutter depend on the underlying platform, including the
* capabilities of the backend used and the OpenGL features exposed through the
* Clutter and COGL API.
*
* It is possible to ask whether Clutter has support for specific features at
* run-time.
*
* See also cogl_get_features() and #CoglFeatureFlags
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "clutter-backend-private.h"
#include "clutter-feature.h"
#include "clutter-main.h"
#include "clutter-private.h"
#include "clutter-debug.h"
#include "cogl/cogl.h"
typedef struct ClutterFeatures
{
ClutterFeatureFlags flags;
guint features_set : 1;
} ClutterFeatures;
static ClutterFeatures* __features = NULL;
static ClutterFeatureFlags
clutter_features_from_cogl (guint cogl_flags)
{
ClutterFeatureFlags clutter_flags = 0;
if (cogl_flags & COGL_FEATURE_TEXTURE_NPOT)
clutter_flags |= CLUTTER_FEATURE_TEXTURE_NPOT;
if (cogl_flags & COGL_FEATURE_TEXTURE_YUV)
clutter_flags |= CLUTTER_FEATURE_TEXTURE_YUV;
if (cogl_flags & COGL_FEATURE_TEXTURE_READ_PIXELS)
clutter_flags |= CLUTTER_FEATURE_TEXTURE_READ_PIXELS;
if (cogl_flags & COGL_FEATURE_SHADERS_GLSL)
clutter_flags |= CLUTTER_FEATURE_SHADERS_GLSL;
if (cogl_flags & COGL_FEATURE_OFFSCREEN)
clutter_flags |= CLUTTER_FEATURE_OFFSCREEN;
return clutter_flags;
}
gboolean
_clutter_feature_init (GError **error)
{
ClutterMainContext *context;
CLUTTER_NOTE (MISC, "checking features");
if (!__features)
{
CLUTTER_NOTE (MISC, "allocating features data");
__features = g_new0 (ClutterFeatures, 1);
__features->features_set = FALSE; /* don't rely on zero-ing */
}
if (__features->features_set)
return TRUE;
context = _clutter_context_get_default ();
/* makes sure we have a GL context; if we have, this is a no-op */
if (!_clutter_backend_create_context (context->backend, error))
return FALSE;
__features->flags = (clutter_features_from_cogl (cogl_get_features ())
| _clutter_backend_get_features (context->backend));
__features->features_set = TRUE;
CLUTTER_NOTE (MISC, "features checked");
return TRUE;
}
/**
* 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: 0.2
*/
gboolean
clutter_feature_available (ClutterFeatureFlags feature)
{
if (G_UNLIKELY (!__features))
{
g_critical ("Unable to check features. Have you initialized Clutter?");
return FALSE;
}
return (__features->flags & feature);
}
/**
* clutter_feature_get_all:
*
* Returns all the supported features.
*
* Return value: a logical OR of all the supported features.
*
* Since: 0.2
*/
ClutterFeatureFlags
clutter_feature_get_all (void)
{
if (G_UNLIKELY (!__features))
{
g_critical ("Unable to check features. Have you initialized Clutter?");
return FALSE;
}
return __features->flags;
}
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