72f4ddf532
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
142 lines
4.3 KiB
C
142 lines
4.3 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2009 Intel Corporation.
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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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "cogl.h"
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#include "cogl-context.h"
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#include "cogl-feature-private.h"
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gboolean
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_cogl_feature_check (const CoglFeatureData *data,
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unsigned int gl_major,
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unsigned int gl_minor,
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const char *extensions_string)
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{
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const char *suffix = NULL;
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int func_num;
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_COGL_GET_CONTEXT (ctx, FALSE);
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/* First check whether the functions should be directly provided by
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GL */
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if (COGL_CHECK_GL_VERSION (gl_major, gl_minor,
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data->min_gl_major, data->min_gl_minor))
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suffix = "";
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else
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{
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/* Otherwise try all of the extensions */
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const char *namespace, *namespace_suffix;
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unsigned int namespace_len;
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for (namespace = data->namespaces;
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*namespace;
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namespace += strlen (namespace) + 1)
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{
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const char *extension;
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GString *full_extension_name = g_string_new ("");
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/* If the namespace part contains a ':' then the suffix for
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the function names is different from the name space */
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if ((namespace_suffix = strchr (namespace, ':')))
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{
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namespace_len = namespace_suffix - namespace;
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namespace_suffix++;
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}
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else
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{
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namespace_len = strlen (namespace);
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namespace_suffix = namespace;
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}
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for (extension = data->extension_names;
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*extension;
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extension += strlen (extension) + 1)
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{
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g_string_set_size (full_extension_name, 0);
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g_string_append (full_extension_name, "GL_");
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g_string_append_len (full_extension_name,
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namespace, namespace_len);
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g_string_append_c (full_extension_name, '_');
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g_string_append (full_extension_name, extension);
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if (!_cogl_check_extension (full_extension_name->str,
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extensions_string))
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break;
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}
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g_string_free (full_extension_name, TRUE);
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/* If we found all of the extensions with this namespace
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then use it as the suffix */
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if (*extension == '\0')
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{
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suffix = namespace_suffix;
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break;
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}
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}
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}
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/* If we couldn't find anything that provides the functions then
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give up */
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if (suffix == NULL)
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return FALSE;
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/* Try to get all of the entry points */
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for (func_num = 0; data->functions[func_num].name; func_num++)
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{
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void *func;
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char *full_function_name;
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full_function_name = g_strconcat (data->functions[func_num].name,
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suffix, NULL);
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func = cogl_get_proc_address (full_function_name);
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g_free (full_function_name);
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if (func == NULL)
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break;
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/* Set the function pointer in the context */
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*(void **) ((guint8 *) ctx +
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data->functions[func_num].pointer_offset) = func;
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}
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/* If one of the functions wasn't found then we should set all of
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the function pointers back to NULL so that the rest of Cogl can
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safely do feature testing by just looking at the function
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pointers */
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if (data->functions[func_num].name)
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{
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while (func_num-- > 0)
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*(void **) ((guint8 *) ctx +
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data->functions[func_num].pointer_offset) = NULL;
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return FALSE;
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}
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else
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return TRUE;
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}
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