mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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259 lines
8.1 KiB
C
259 lines
8.1 KiB
C
/*
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* GStreamer
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* Copyright (C) 2012 Matthew Waters <ystreet00@gmail.com>
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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 Library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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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 "gl.h"
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#include "gstglfeature.h"
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gboolean
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gst_gl_check_extension (const char *name, const gchar * ext)
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{
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char *end;
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int name_len, n;
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if (name == NULL || ext == NULL)
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return FALSE;
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end = (char *) (ext + strlen (ext));
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name_len = strlen (name);
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while (ext < end) {
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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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/* Define a set of arrays containing the functions required from GL
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for each feature */
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#define GST_GL_EXT_BEGIN(name, \
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gl_availability, \
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min_gl_major, min_gl_minor, \
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min_gles_major, min_gles_minor, \
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namespaces, extension_names) \
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static const GstGLFeatureFunction gst_gl_ext_ ## name ## _funcs[] = {
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#define GST_GL_EXT_FUNCTION(ret, name, args) \
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{ G_STRINGIFY (name), G_STRUCT_OFFSET (GstGLFuncs, name) },
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#define GST_GL_EXT_END() \
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{ NULL, 0 }, \
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};
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#include "glprototypes/all_functions.h"
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#undef GST_GL_EXT_BEGIN
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#undef GST_GL_EXT_FUNCTION
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#undef GST_GL_EXT_END
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#define GST_GL_EXT_BEGIN(name, \
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gl_availability, \
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min_gl_major, min_gl_minor, \
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min_gles_major, min_gles_minor, \
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namespaces, extension_names) \
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{ G_STRINGIFY (name), gl_availability, min_gl_major, min_gl_minor, min_gles_major, \
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min_gles_minor, namespaces, extension_names, \
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gst_gl_ext_ ## name ## _funcs },
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#define GST_GL_EXT_FUNCTION(ret, name, args)
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#define GST_GL_EXT_END()
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static const GstGLFeatureData gst_gl_feature_ext_functions_data[] = {
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#include "glprototypes/all_functions.h"
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};
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#undef GST_GL_EXT_BEGIN
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#undef GST_GL_EXT_FUNCTION
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#undef GST_GL_EXT_END
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static gboolean
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_gst_gl_feature_check_for_extension (const GstGLFeatureData * data,
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const char *driver_prefix, const char *extensions_string,
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const char **suffix)
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{
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const char *namespace, *namespace_suffix;
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unsigned int namespace_len;
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g_return_val_if_fail (suffix != NULL, FALSE);
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for (namespace = data->namespaces; *namespace;
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namespace += strlen (namespace) + 1) {
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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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namespace_len = namespace_suffix - namespace;
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namespace_suffix++;
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} else {
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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; *extension;
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extension += strlen (extension) + 1) {
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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, 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 (gst_gl_check_extension (full_extension_name->str, extensions_string)) {
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GST_TRACE ("found %s in extension string", full_extension_name->str);
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break;
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}
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}
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g_string_free (full_extension_name, TRUE);
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/* If we found an extension with this namespace then use it
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as the suffix */
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if (*extension) {
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*suffix = namespace_suffix;
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return TRUE;
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}
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}
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return FALSE;
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}
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gboolean
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_gst_gl_feature_check (GstGLContext * context,
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const char *driver_prefix,
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const GstGLFeatureData * data,
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int gl_major, int gl_minor, const char *extensions_string)
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{
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char *full_function_name = NULL;
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gboolean in_core = FALSE;
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const char *suffix = NULL;
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int func_num;
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GstGLFuncs *gst_gl = context->gl_vtable;
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guint gl_min = 0, gl_maj = 0;
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GstGLAPI gl_api = gst_gl_context_get_gl_api (context);
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if (gl_api & (GST_GL_API_OPENGL | GST_GL_API_OPENGL3)) {
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gl_maj = data->min_gl_major;
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gl_min = data->min_gl_minor;
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} else if (gl_api & (GST_GL_API_GLES1 | GST_GL_API_GLES2)) {
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gl_maj = data->min_gles_major;
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gl_min = data->min_gles_minor;
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}
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GST_DEBUG ("%s, 0x%x, %d.%d vs 0x%x, %d.%d", data->feature_name,
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data->gl_availability, gl_maj, gl_min,
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gst_gl_context_get_gl_api (context), gl_major, gl_minor);
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/* First check whether the functions should be directly provided by
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GL */
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if (gst_gl_context_check_gl_version (context, data->gl_availability, gl_maj,
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gl_min)) {
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in_core = TRUE;
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suffix = "";
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} else {
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/* Otherwise try all of the extensions */
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if (!_gst_gl_feature_check_for_extension (data, driver_prefix,
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extensions_string, &suffix))
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goto error;
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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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void *func;
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if (full_function_name)
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g_free (full_function_name);
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full_function_name = g_strconcat ("gl", data->functions[func_num].name,
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suffix, NULL);
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GST_TRACE ("%s should %sbe in core", full_function_name,
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in_core ? "" : "not ");
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func = gst_gl_context_get_proc_address (context, full_function_name);
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if (func == NULL && in_core) {
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GST_TRACE ("%s was not found in core, trying the extension version",
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full_function_name);
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if (!_gst_gl_feature_check_for_extension (data, driver_prefix,
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extensions_string, &suffix)) {
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goto error;
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} else {
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g_free (full_function_name);
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full_function_name = g_strconcat ("gl", data->functions[func_num].name,
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suffix, NULL);
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func = gst_gl_context_get_proc_address (context, full_function_name);
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}
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}
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if (func == NULL) {
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goto error;
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}
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/* Set the function pointer in the context */
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*(void **) ((guint8 *) gst_gl +
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data->functions[func_num].pointer_offset) = func;
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}
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g_free (full_function_name);
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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 we 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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GST_DEBUG ("failed to find feature %s", data->feature_name);
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for (func_num = 0; data->functions[func_num].name; func_num++) {
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*(void **) ((guint8 *) gst_gl +
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data->functions[func_num].pointer_offset) = NULL;
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}
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if (full_function_name) {
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GST_DEBUG ("failed to find function %s", full_function_name);
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g_free (full_function_name);
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}
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return FALSE;
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}
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void
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_gst_gl_feature_check_ext_functions (GstGLContext * context,
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int gl_major, int gl_minor, const char *gl_extensions)
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{
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int i;
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for (i = 0; i < G_N_ELEMENTS (gst_gl_feature_ext_functions_data); i++) {
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_gst_gl_feature_check (context, "GL",
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gst_gl_feature_ext_functions_data + i, gl_major, gl_minor,
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gl_extensions);
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}
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}
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