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[674/906] feature: try and catch more GL extension functions

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if we don't find the extension in core GL, try the extension version anyway
This commit is contained in:
Matthew Waters 2013-03-09 22:45:23 +11:00
parent 9e87a794dd
commit 01e016d3f4
1 changed files with 89 additions and 43 deletions
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132
gst-libs/gst/gl/gstglfeature.c
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@ -72,7 +72,7 @@ gst_gl_check_extension (const char *name, const gchar * ext)
gles_availability, \
namespaces, extension_names) \
{ min_gl_major, min_gl_minor, gles_availability, namespaces, \
extension_names, \
extension_names, \
gst_gl_ext_ ## name ## _funcs },
#undef GST_GL_EXT_FUNCTION
#define GST_GL_EXT_FUNCTION(ret, name, args)
@ -87,12 +87,66 @@ static const GstGLFeatureData gst_gl_feature_ext_functions_data[] = {
#undef GST_GL_EXT_FUNCTION
#undef GST_GL_EXT_END
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 (GstGLDisplay * display,
const char *driver_prefix,
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 = display->gl_vtable;
@ -104,48 +158,13 @@ _gst_gl_feature_check (GstGLDisplay * display,
data->min_gl_major, data->min_gl_minor)) ||
((display->gl_api & GST_GL_API_GLES2) &&
(data->gl_availability & GST_GL_API_GLES2))) {
in_core = TRUE;
suffix = "";
} else {
/* Otherwise try all of the extensions */
const char *namespace, *namespace_suffix;
unsigned int namespace_len;
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))
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;
break;
}
}
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
@ -156,20 +175,41 @@ _gst_gl_feature_check (GstGLDisplay * display,
/* Try to get all of the entry points */
for (func_num = 0; data->functions[func_num].name; func_num++) {
void *func;
char *full_function_name;
if (full_function_name)
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_window_get_proc_address (display->gl_window, full_function_name);
g_free (full_function_name);
if (func == NULL)
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_window_get_proc_address (display->gl_window,
full_function_name);
}
}
if (func == NULL) {
goto error;
}
/* Set the function pointer in the context */
*(void **) ((guint8 *) gst_gl +
data->functions[func_num].pointer_offset) = func;
g_free (full_function_name);
}
return TRUE;
@ -178,11 +218,17 @@ _gst_gl_feature_check (GstGLDisplay * display,
* then set all of the functions pointers to NULL so we can safely
* do feature testing by just looking at the function pointers */
error:
for (func_num = 0; data->functions[func_num].name; func_num++) {
*(void **) ((guint8 *) gst_gl +
data->functions[func_num].pointer_offset) = NULL;
}
if (full_function_name) {
GST_TRACE ("failed to find function %s", full_function_name);
g_free (full_function_name);
}
return FALSE;
}