[Bug 84944] tearing on radeonsi vdpau deinterlacer

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84944

--- Comment #13 from Christian König <deathsimple at vodafone.de> ---
(In reply to warpme from comment #11)
> Maybe Kabini's xserver log output about "EXA not supported" is clue here? Is
> EXA supported on Kabini at all?
> 
> heh - I spent great time to adding glamor to carefully minimized minimyth2
> image - just because on many places it is stated that mesa's radeonsi
> mandatory requires glamor.... 

Sorry you misunderstood me: Glamor is mandatory on SI, there is not support for
EXA. This is correct.

But glamor shouldn't be used in this situation because we have only one
fullscreen application on the screen. In this situation page flipping should be
used by the X server without any copy operation required by glamor.

Page flipping operations are tear free, so what we see here is that without
deinterlacing the graphics stack uses page flipping and with deinterlacing it
uses glamor with of course results in badly tearing of the video.

The question is why the heck do we fallback to a copy operation with glamor
when deinterlacing is enabled? Deinterlacing is independent of displaying the
video so this makes no sense.

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