gstreamer/subprojects/gst-plugins-base/gst-libs/gst/gl/gstglfeature.c

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/*
* GStreamer
* Copyright (C) 2012 Matthew Waters <ystreet00@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
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/**
* SECTION:gstglfeature
* @short_description: OpenGL feature checking
* @title: GstGLFeature
* @see_also: #GstGLContext
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstglfeature.h"
#include "gstglcontext.h"
#include "gstglfeature_private.h"
#include "gstglfuncs.h"
#define GST_CAT_DEFAULT gl_feature
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
static void
_init_debug (void)
{
static gsize _init = 0;
if (g_once_init_enter (&_init)) {
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "glfeature", 0,
"OpenGL feature detection");
g_once_init_leave (&_init, 1);
}
}
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/**
* gst_gl_check_extension:
* @name: the extension to search for
* @ext: the list of possible extensions
*
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* Returns: whether @name is in the space separated list of @ext
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*/
gboolean
gst_gl_check_extension (const char *name, const gchar * ext)
{
char *end;
int name_len, n;
if (name == NULL || ext == NULL)
return FALSE;
end = (char *) (ext + strlen (ext));
name_len = strlen (name);
while (ext < end) {
n = strcspn (ext, " ");
if ((name_len == n) && (!strncmp (name, ext, n)))
return TRUE;
ext += (n + 1);
}
return FALSE;
}
/* Define a set of arrays containing the functions required from GL
for each feature */
#define GST_GL_EXT_BEGIN(name, \
gl_availability, \
min_gl_major, min_gl_minor, \
min_gles_major, min_gles_minor, \
namespaces, extension_names) \
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static const GstGLFeatureFunction gst_gl_ext_ ## name ## _funcs[] = {
#define GST_GL_EXT_FUNCTION(ret, name, args) \
{ G_STRINGIFY (name), G_STRUCT_OFFSET (GstGLFuncs, name) },
#define GST_GL_EXT_END() \
{ NULL, 0 }, \
};
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#include "glprototypes/all_functions.h"
#undef GST_GL_EXT_BEGIN
#undef GST_GL_EXT_FUNCTION
#undef GST_GL_EXT_END
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#define GST_GL_EXT_BEGIN(name, \
gl_availability, \
min_gl_major, min_gl_minor, \
min_gles_major, min_gles_minor, \
namespaces, extension_names) \
{ G_STRINGIFY (name), gl_availability, min_gl_major, min_gl_minor, min_gles_major, \
min_gles_minor, namespaces, extension_names, \
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gst_gl_ext_ ## name ## _funcs },
#define GST_GL_EXT_FUNCTION(ret, name, args)
#define GST_GL_EXT_END()
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static const GstGLFeatureData gst_gl_feature_ext_functions_data[] = {
#include "glprototypes/all_functions.h"
};
#undef GST_GL_EXT_BEGIN
#undef GST_GL_EXT_FUNCTION
#undef GST_GL_EXT_END
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static gboolean
_gst_gl_feature_check_for_extension (const GstGLFeatureData * data,
const char *driver_prefix, const char *extensions_string,
const char **suffix)
{
const char *namespace, *namespace_suffix;
unsigned int namespace_len;
g_return_val_if_fail (suffix != NULL, FALSE);
for (namespace = data->namespaces; *namespace;
namespace += strlen (namespace) + 1) {
const char *extension;
GString *full_extension_name = g_string_new ("");
/* If the namespace part contains a ':' then the suffix for
the function names is different from the name space */
if ((namespace_suffix = strchr (namespace, ':'))) {
namespace_len = namespace_suffix - namespace;
namespace_suffix++;
} else {
namespace_len = strlen (namespace);
namespace_suffix = namespace;
}
for (extension = data->extension_names; *extension;
extension += strlen (extension) + 1) {
g_string_assign (full_extension_name, driver_prefix);
g_string_append_c (full_extension_name, '_');
g_string_append_len (full_extension_name, namespace, namespace_len);
g_string_append_c (full_extension_name, '_');
g_string_append (full_extension_name, extension);
if (gst_gl_check_extension (full_extension_name->str, extensions_string)) {
GST_TRACE ("found %s in extension string", full_extension_name->str);
break;
}
}
g_string_free (full_extension_name, TRUE);
/* If we found an extension with this namespace then use it
as the suffix */
if (*extension) {
*suffix = namespace_suffix;
return TRUE;
}
}
return FALSE;
}
gboolean
_gst_gl_feature_check (GstGLContext * context,
const char *driver_prefix,
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const GstGLFeatureData * data,
int gl_major, int gl_minor, const char *extensions_string)
{
char *full_function_name = NULL;
gboolean in_core = FALSE;
const char *suffix = NULL;
int func_num;
GstGLFuncs *gst_gl = context->gl_vtable;
guint gl_min = 0, gl_maj = 0;
GstGLAPI gl_api = gst_gl_context_get_gl_api (context);
if (gl_api & (GST_GL_API_OPENGL | GST_GL_API_OPENGL3)) {
gl_maj = data->min_gl_major;
gl_min = data->min_gl_minor;
} else if (gl_api & (GST_GL_API_GLES1 | GST_GL_API_GLES2)) {
gl_maj = data->min_gles_major;
gl_min = data->min_gles_minor;
}
GST_DEBUG ("%s, 0x%x, %d.%d vs 0x%x, %d.%d", data->feature_name,
data->gl_availability, gl_maj, gl_min,
gst_gl_context_get_gl_api (context), gl_major, gl_minor);
/* First check whether the functions should be directly provided by
GL */
if (gst_gl_context_check_gl_version (context, data->gl_availability, gl_maj,
gl_min)) {
in_core = TRUE;
suffix = "";
} else {
/* Otherwise try all of the extensions */
if (!_gst_gl_feature_check_for_extension (data, driver_prefix,
extensions_string, &suffix))
goto error;
}
/* If we couldn't find anything that provides the functions then
give up */
if (suffix == NULL)
goto error;
/* Try to get all of the entry points */
for (func_num = 0; data->functions[func_num].name; func_num++) {
void *func;
g_free (full_function_name);
full_function_name = g_strconcat ("gl", data->functions[func_num].name,
suffix, NULL);
GST_TRACE ("%s should %sbe in core", full_function_name,
in_core ? "" : "not ");
func = gst_gl_context_get_proc_address (context, full_function_name);
if (func == NULL && in_core) {
GST_TRACE ("%s was not found in core, trying the extension version",
full_function_name);
if (!_gst_gl_feature_check_for_extension (data, driver_prefix,
extensions_string, &suffix)) {
goto error;
} else {
g_free (full_function_name);
full_function_name = g_strconcat ("gl", data->functions[func_num].name,
suffix, NULL);
func = gst_gl_context_get_proc_address (context, full_function_name);
}
}
if (func == NULL) {
goto error;
}
/* Set the function pointer in the context */
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*(void **) ((guint8 *) gst_gl +
data->functions[func_num].pointer_offset) = func;
}
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g_free (full_function_name);
return TRUE;
/* If the extension isn't found or one of the functions wasn't found
* then set all of the functions pointers to NULL so we can safely
* do feature testing by just looking at the function pointers */
error:
GST_DEBUG ("failed to find feature %s", data->feature_name);
for (func_num = 0; data->functions[func_num].name; func_num++) {
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*(void **) ((guint8 *) gst_gl +
data->functions[func_num].pointer_offset) = NULL;
}
if (full_function_name) {
GST_DEBUG ("failed to find function %s", full_function_name);
g_free (full_function_name);
}
return FALSE;
}
void
_gst_gl_feature_check_ext_functions (GstGLContext * context,
int gl_major, int gl_minor, const char *gl_extensions)
{
int i;
_init_debug ();
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for (i = 0; i < G_N_ELEMENTS (gst_gl_feature_ext_functions_data); i++) {
_gst_gl_feature_check (context, "GL",
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gst_gl_feature_ext_functions_data + i, gl_major, gl_minor,
gl_extensions);
}
}