[Xorg] XComposite, XDamage Extension with Xvideo or GL

Andy Ritger aritger at nvidia.com
Fri Aug 6 10:41:52 PDT 2004

The technical challenges of Damage/Composite with direct rendering
clients have been discussed in threads such as this one:


I believe Damage/Composite + GLX direct rendering clients is a
solvable problem, but there will be a significant performance
impact, and it will be a long term project (eg: I do not have an
ETA of when NVIDIA will be able to provide an OpenGL driver that
interacts correctly with Damage/Composite; I'm not familiar with
DRI's schedule for Damage/Composite support).

I do not believe video overlays will be usable with Damage/Composite.

- Andy

On Fri, 6 Aug 2004, Amir Bukhari wrote:

> Redirect OpenGL application to backing store pixmap does not work with
> Composite Extension (in Manual Mode) (Xserver always draw).
> Is GLX use a wrapper functions for GC Operations, which let the Deron
> Johnson hacks of GC wrapper functions in Composite extension not work OR
> there is others reason? We use it by project Looking Glass.
> Note that most GLX modules come with graphic card, which we could not hack
> it directly.
> Xvideo uses the overlay feature of the video cards to draw the video on the
> screen, which bring trouble with composite extension. I heared there is a
> discussion about how to get Xvideo to work with Composite extension, is that
> right?
> Amir Bukhari
> E-Mail: ufz6 at rz.uni-karlsruhe.de 
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