Commit db53ca38 authored by Robert Bragg's avatar Robert Bragg
Browse files

cogl: fallback to non-transparent stages if unsupported

If our check of the CoglOnscreenTemplate during initialization fails
then we disable the request for an alpha component in the swap chain and
try the check again.
Reviewed-by: default avatarNeil Roberts <>
Reviewed-by: default avatarEmmanuele Bassi <>
parent b751b90b
......@@ -289,6 +289,7 @@ clutter_backend_cogl_create_context (ClutterBackend *backend,
CoglSwapChain *swap_chain = NULL;
CoglOnscreenTemplate *onscreen_template = NULL;
gboolean status;
if (backend->cogl_context)
return TRUE;
......@@ -318,9 +319,28 @@ clutter_backend_cogl_create_context (ClutterBackend *backend,
* Conceptually should we be able to check an onscreen_template
* without more details about the CoglDisplay configuration?
if (!cogl_renderer_check_onscreen_template (backend->cogl_renderer,
status = cogl_renderer_check_onscreen_template (backend->cogl_renderer,
if (!status && clutter_x11_get_use_argb_visual ())
g_clear_error (error);
/* It's possible that the current renderer doesn't support transparency
* in a swap_chain so lets see if we can fallback to not having any
* transparency...
* XXX: It might be nice to have a CoglRenderer feature we could
* explicitly check for ahead of time.
cogl_swap_chain_set_has_alpha (swap_chain, FALSE);
status = cogl_renderer_check_onscreen_template (backend->cogl_renderer,
if (!status)
goto error;
backend->cogl_display = cogl_display_new (backend->cogl_renderer,
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