be15bf75e4
This adds an internal _cogl_get_proc_address that doesn't need a CoglContext. This will enable us to check driver features earlier.
141 lines
4.4 KiB
C
141 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-private.h"
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#include "cogl-feature-private.h"
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gboolean
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_cogl_feature_check (const CoglWinsysVtable *winsys,
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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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void *function_table)
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{
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const char *suffix = NULL;
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int func_num;
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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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goto error;
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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 (winsys, full_function_name);
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g_free (full_function_name);
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if (func == NULL)
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goto error;
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/* Set the function pointer in the context */
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*(void **) ((guint8 *) function_table +
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data->functions[func_num].pointer_offset) = func;
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}
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return TRUE;
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/* If the extension isn't found or one of the functions wasn't found
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* then set all of the functions pointers to NULL so Cogl can safely
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* do feature testing by just looking at the function pointers */
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error:
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for (func_num = 0; data->functions[func_num].name; func_num++)
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*(void **) ((guint8 *) function_table +
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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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