xf86-video-ati page flipping fixes

[Jesse Barnes]

On Thu, 5 May 2011 18:33:11 +0200
Mario Kleiner <mario.kleiner at tuebingen.mpg.de> wrote:

> Are you sure this is also the case even when kms page flipping is  
> used for fullscreen drawables?
> 
> The workaround i implemented in my toolkit for the page flipping  
> problem when using fullscreen drawables on current x servers was to  
> make sure that it always ends a session with an even number of  
> completed page-flipping swaps, by checking 'sbc' and issuing an extra  
> swap before closing its window if the sbc wasn't an even number. This  
> makes sure that the same buffer objects are assigned as front- and  
> backbuffer at the time the window closes as when the application  
> started and opened its fullscreen window. This fixed any desktop  
> corruption i'd usually get when running compiz with non-redirected  
> fullscreen windows after quitting my application.
> 
> I could be totally wrong, but at least the symptoms and the working  
> workaround suggested fullscreen drawables do share their back buffers  
> when page flipping is on.

Is this workaround needed on the Intel driver too?  Or is this just a
driver bo name tracking bug?

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center