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cogl: fallback to non-transparent stages if unsupported

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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: Neil Roberts <neil@linux.intel.com>
Reviewed-by: Emmanuele Bassi <ebassi@linux.intel.com>
This commit is contained in:
Robert Bragg 2011-11-01 13:42:40 +00:00
parent b751b90bc0
commit db53ca382c
1 changed files with 23 additions and 3 deletions
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26
clutter/cogl/clutter-backend-cogl.c
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@ -289,6 +289,7 @@ clutter_backend_cogl_create_context (ClutterBackend *backend,
#endif
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,
onscreen_template,
error))
status = cogl_renderer_check_onscreen_template (backend->cogl_renderer,
onscreen_template,
error);
#ifdef COGL_HAS_XLIB_SUPPORT
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,
onscreen_template,
error);
}
#endif
if (!status)
goto error;
backend->cogl_display = cogl_display_new (backend->cogl_renderer,