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backend: Check for a known set of drivers

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We want to use the Cogl GL3 driver, if possible, and then go through a
known list of Cogl drivers, before giving up and using COGL_DRIVER_ANY.

Based on original patch from Emmanuele Bassi.

We have to create and tear down the whole context when trying
out the drivers though because the extension checks do not happen
until cogl_context_init.

https://bugzilla.gnome.org/show_bug.cgi?id=742678
This commit is contained in:
Adel Gadllah 2015-07-26 11:29:10 +02:00
parent 40f6a0135e
commit 9a510c0117
1 changed files with 56 additions and 13 deletions
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69
clutter/clutter-backend.c
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@ -243,8 +243,9 @@ clutter_backend_real_font_changed (ClutterBackend *backend)
}
static gboolean
clutter_backend_real_create_context (ClutterBackend *backend,
GError **error)
clutter_backend_do_real_create_context (ClutterBackend *backend,
CoglDriver driver_id,
GError **error)
{
ClutterBackendClass *klass;
CoglSwapChain *swap_chain;
@ -276,6 +277,7 @@ clutter_backend_real_create_context (ClutterBackend *backend,
#endif
CLUTTER_NOTE (BACKEND, "Connecting the renderer");
cogl_renderer_set_driver (backend->cogl_renderer, driver_id);
if (!cogl_renderer_connect (backend->cogl_renderer, &internal_error))
goto error;
@ -332,10 +334,6 @@ clutter_backend_real_create_context (ClutterBackend *backend,
if (backend->cogl_context == NULL)
goto error;
backend->cogl_source = cogl_glib_source_new (backend->cogl_context,
G_PRIORITY_DEFAULT);
g_source_attach (backend->cogl_source, NULL);
/* the display owns the renderer and the swap chain */
cogl_object_unref (backend->cogl_renderer);
cogl_object_unref (swap_chain);
@ -358,16 +356,61 @@ error:
if (swap_chain != NULL)
cogl_object_unref (swap_chain);
if (internal_error != NULL)
g_propagate_error (error, internal_error);
else
g_set_error_literal (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
_("Unable to initialize the Clutter backend"));
return FALSE;
}
static gboolean
clutter_backend_real_create_context (ClutterBackend *backend,
GError **error)
{
static const struct {
const char *driver_name;
CoglDriver driver_id;
} known_drivers[] = {
{ "GL3", COGL_DRIVER_GL3 },
{ "GL (Legacy)", COGL_DRIVER_GL },
{ "GLES 2.0", COGL_DRIVER_GLES2 },
{ "ANY", COGL_DRIVER_ANY },
};
GError *internal_error = NULL;
int i;
for (i = 0; i < G_N_ELEMENTS (known_drivers); i++)
{
CLUTTER_NOTE (BACKEND, "Checking for the %s driver", known_drivers[i].driver_name);
if (clutter_backend_do_real_create_context (backend, known_drivers[i].driver_id, &internal_error))
break;
if (internal_error)
{
CLUTTER_NOTE (BACKEND, "Unable to use the %s driver: %s",
known_drivers[i].driver_name,
internal_error->message);
g_clear_error (&internal_error);
}
}
if (backend->cogl_context == NULL)
{
if (internal_error != NULL)
g_propagate_error (error, internal_error);
else
g_set_error_literal (error, CLUTTER_INIT_ERROR,
CLUTTER_INIT_ERROR_BACKEND,
_("Unable to initialize the Clutter backend"));
return FALSE;
}
backend->cogl_source = cogl_glib_source_new (backend->cogl_context,
G_PRIORITY_DEFAULT);
g_source_attach (backend->cogl_source, NULL);
return TRUE;
}
static void
clutter_backend_real_ensure_context (ClutterBackend *backend,
ClutterStage *stage)