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.
114 lines
2.6 KiB
C
114 lines
2.6 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:clutter-feature
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* @short_description: functions to query available GL features ay runtime
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*
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* Functions to query available GL features ay runtime
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*/
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#include "config.h"
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#include "clutter-feature.h"
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#include "string.h"
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static ClutterFeatureFlags __features = -1;
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/* Note must be called after context created */
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static gboolean
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check_gl_extension (const gchar *name)
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{
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const gchar *ext;
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gchar *end;
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gint name_len, n;
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ext = (const gchar*)glGetString(GL_EXTENSIONS);
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if (name == NULL || ext == NULL)
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return FALSE;
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end = (gchar*)(ext + strlen(ext));
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name_len = strlen(name);
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while (ext < end)
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{
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n = strcspn(ext, " ");
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if ((name_len == n) && (!strncmp(name, ext, n)))
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return TRUE;
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ext += (n + 1);
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}
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return FALSE;
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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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if (__features != -1)
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{
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g_warning ("You should never call clutter_feature_init() "
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"more than once.");
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return;
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}
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__features = 0;
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if (check_gl_extension ("GL_ARB_texture_rectangle"))
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__features |= CLUTTER_FEATURE_TEXTURE_RECTANGLE;
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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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return (__features & feature);
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}
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/**
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* clutter_feature_all:
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*
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* Returns all the suppoerted 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_all (void)
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{
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return __features;
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}
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