31b5beb2c0
This adds the framework needed to check for winsys specific extensions (such as GLX extensions) using a similar mechanism to the cogl-feature-functions header. There is a separate cogl-winsys-feature-functions header which will contain macros to list the extensions and functions. cogl_create_context_winsys now calls _cogl_feature_check for each of these functions. _cogl_feature_check has had to be changed to accept the driver prefix as the first parameter so that it can prepend "GLX" rather than "GL" in this case.
143 lines
4.4 KiB
C
143 lines
4.4 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 char *driver_prefix,
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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_assign (full_extension_name, driver_prefix);
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g_string_append_c (full_extension_name, '_');
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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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