ecccec75cb
* clutter/Makefile.am:
* clutter/clutter-feature.c:
* clutter/clutter-feature.h:
Add new funcs for checking for available runtime GL
extensions.
* clutter/clutter-clone-texture.c:
* clutter/clutter-texture.c:
Add support for non power of two textures
if GL_TEXTURE_RECTANGLE_ARB extension available ( at runtime ).
Should lower texture memory needs a little.
91 lines
2 KiB
C
91 lines
2 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 gulong __features;
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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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gboolean
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clutter_feature_available (gulong query)
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{
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return (__features & query);
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}
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gulong
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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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void
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clutter_feature_init (void)
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{
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if (__features)
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return;
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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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