[maemo-developers] gtk clutter tearing

From: Mark Clarkson mark.clarkson at smorg.co.uk
Date: Wed Jan 13 22:42:56 EET 2010
Many thanks for the information Kimmo. At least I know which way to go now - this seems to be similar to how iPhone apps behave and I guess this will allow me to port to other OpenGL devices quite easily.

----- Original message -----
> On Tue, 2009-12-29 at 16:17 +0100, Tamminen Eero (Nokia-D/Helsinki)
> wrote:
> > Hi,
> >
> > ext Mark Clarkson wrote:
> > > I have made a simple animation using a clutter timeline with
> > > clutter-gtk-0.10 and clutter-1.0 but there is excessive tearing when the
> > > animation plays making the animation look terrible.
> > >
> > > I have tried none, dri and glx values for the CLUTTER_VBLANK environment
> > > variable but this seems to have no effect at all.
> > >
> > > Is there a way to fix this?
> >
> > Screen update isn't yet synched to LCD refresh.  Please file a bug about
> > it to bugs.maemo.org (it needs support from kernel display driver, X
> > server, SGX driver, Clutter and hildon-desktop compositor, but I guess
> > you could file it against Official platform -> Core -> X).
> Don't hold your breath with this one. At the moment it seems a proper
> vsync support is not going to be implemented in Maemo 5. There is a
> possibility to use a vsync even now, but the implementation is not good
> enough: if you enable the current vsync, the OpenGL application is
> blocked on glSwapBuffers until vsync comes, which prevents the
> application to prepare the next frame (and drops FPS too low).
> I think doing like Bounce does is the best you can do: use fullscreen
> window and disable the compositor (in hildon-desktop). Recent
> hildon-desktop versions disable compositing automatically for fullscreen
> windows, unless you use HildonStackableWindow (which requires the
> sliding animation).
> -Kimmo

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