164 lines
4.0 KiB
C
164 lines
4.0 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2006 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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/**
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* SECTION:clutter-feature
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* @short_description: Run-time detection of Clutter features
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*
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* Parts of Clutter depend on the underlying platform, including the
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* capabilities of the backend used and the OpenGL features exposed through the
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* Clutter and COGL API.
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*
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* It is possible to ask whether Clutter has support for specific features at
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* run-time.
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*
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* See also cogl_get_features() and #CoglFeatureFlags
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include "clutter-backend-private.h"
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#include "clutter-feature.h"
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#include "clutter-main.h"
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#include "clutter-private.h"
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#include "clutter-debug.h"
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#include "cogl/cogl.h"
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typedef struct ClutterFeatures
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{
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ClutterFeatureFlags flags;
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guint features_set : 1;
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} ClutterFeatures;
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static ClutterFeatures* __features = NULL;
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static ClutterFeatureFlags
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clutter_features_from_cogl (guint cogl_flags)
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{
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ClutterFeatureFlags clutter_flags = 0;
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if (cogl_flags & COGL_FEATURE_TEXTURE_NPOT)
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clutter_flags |= CLUTTER_FEATURE_TEXTURE_NPOT;
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if (cogl_flags & COGL_FEATURE_TEXTURE_YUV)
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clutter_flags |= CLUTTER_FEATURE_TEXTURE_YUV;
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if (cogl_flags & COGL_FEATURE_TEXTURE_READ_PIXELS)
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clutter_flags |= CLUTTER_FEATURE_TEXTURE_READ_PIXELS;
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if (cogl_flags & COGL_FEATURE_SHADERS_GLSL)
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clutter_flags |= CLUTTER_FEATURE_SHADERS_GLSL;
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if (cogl_flags & COGL_FEATURE_OFFSCREEN)
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clutter_flags |= CLUTTER_FEATURE_OFFSCREEN;
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return clutter_flags;
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}
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gboolean
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_clutter_feature_init (GError **error)
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{
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ClutterMainContext *context;
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CLUTTER_NOTE (MISC, "checking features");
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if (!__features)
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{
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CLUTTER_NOTE (MISC, "allocating features data");
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__features = g_new0 (ClutterFeatures, 1);
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__features->features_set = FALSE; /* don't rely on zero-ing */
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}
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if (__features->features_set)
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return TRUE;
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context = _clutter_context_get_default ();
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/* makes sure we have a GL context; if we have, this is a no-op */
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if (!_clutter_backend_create_context (context->backend, error))
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return FALSE;
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__features->flags = (clutter_features_from_cogl (cogl_get_features ())
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| _clutter_backend_get_features (context->backend));
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__features->features_set = TRUE;
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CLUTTER_NOTE (MISC, "features checked");
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return TRUE;
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}
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/**
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* clutter_feature_available:
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* @feature: a #ClutterFeatureFlags
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*
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* Checks whether @feature is available. @feature can be a logical
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* OR of #ClutterFeatureFlags.
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*
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* Return value: %TRUE if a feature is available
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*
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* Since: 0.1.1
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*/
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gboolean
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clutter_feature_available (ClutterFeatureFlags feature)
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{
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if (G_UNLIKELY (!__features))
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{
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g_critical ("Unable to check features. Have you initialized Clutter?");
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return FALSE;
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}
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return (__features->flags & feature);
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}
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/**
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* clutter_feature_get_all:
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*
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* Returns all the supported features.
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*
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* Return value: a logical OR of all the supported features.
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*
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* Since: 0.1.1
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*/
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ClutterFeatureFlags
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clutter_feature_get_all (void)
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{
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if (G_UNLIKELY (!__features))
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{
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g_critical ("Unable to check features. Have you initialized Clutter?");
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return FALSE;
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}
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return __features->flags;
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}
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