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79acb088e7
Since using addresses that might change is something that finally the FSF acknowledge as a plausible scenario (after changing address twice), the license blurb in the source files should use the URI for getting the license in case the library did not come with it. Not that URIs cannot possibly change, but at least it's easier to set up a redirection at the same place. As a side note: this commit closes the oldes bug in Clutter's bug report tool. http://bugzilla.openedhand.com/show_bug.cgi?id=521
151 lines
3.7 KiB
C
151 lines
3.7 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-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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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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void
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_clutter_feature_init (void)
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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;
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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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_clutter_backend_create_context (context->backend, NULL);
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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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}
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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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return FALSE;
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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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return __features->flags;
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}
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