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[backend] Update the viewport when updating the GL context

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Bug 1442 - multistage, same-window resize events invalidate stage

When ensuring that the GL context is attached to the correct
ClutterStage we need to set the SYNC_MATRICES flag on the stage
itself. This is needed in case the size of the new stage does
not match the size of the old -- thus requiring a call to
glViewport() when the paint cycle starts.
This commit is contained in:
Emmanuele Bassi 2009-02-20 15:39:32 +00:00
parent fa996734cf
commit f4df307ddd
1 changed files with 11 additions and 0 deletions
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11
clutter/clutter-backend.c
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@ -310,6 +310,17 @@ _clutter_backend_ensure_context (ClutterBackend *backend,
* potential issue of GL calls with no context)
*/
current_context_stage = stage;
/* if the new stage has a different size than the previous one
* we need to update the viewport; we do it by simply setting the
* SYNC_MATRICES flag and letting the next redraw cycle take care
* of calling glViewport()
*/
if (current_context_stage)
{
CLUTTER_SET_PRIVATE_FLAGS (current_context_stage,
CLUTTER_ACTOR_SYNC_MATRICES);
}
}
else
CLUTTER_NOTE (MULTISTAGE, "Stage is the same");