[compiz] Two XGL questions

[David Reveman]

On Thu, 2006-04-06 at 14:57 +0100, Mike Hearn wrote:
> I know this list is meant for discussion of compiz specifically, but ....
> 
> 1) I sometimes see compiz spit out "Could not bind pixmap to texture"
>     messages, even though it _appears_ to be working fine. I randomly
>     guess that this is due to me running out of video memory (iirc I
>     have 64mb of vram). Is that possibly a problem? I think Vista and
>     OS X manually manage video memory so textures can be swapped out
>     to system memory and even disk. Does XGL do this?

This is harmless and not related to running out of video memory at all.

If a window is mapped and unmapped very quickly it might not be mapped
any longer when the BindTexImage requests gets to the server and it will
fail.

> 
>     The errors don't seem to have any effect, at least, I see no obvious
>     screen corruption.
> 
> 2) The Vista guys seem to think that being able to pre-empt GPU
>     processing is important. Does XGL support this? I am guessing
>     maybe not ... it doesn't seem to matter though, even with
>     the atlantis screensaver running as the backdrop and with all
>     the effects the screen is always snappy and responsive.
> 
> http://blogs.msdn.com/greg_schechter/archive/2006/04/02/566767.aspx
> 
> That blog also contains a discussion of the glass blur effect they have 
> in Vista. It sounds quite hard to do properly but I bet it could be 
> fudged and look nearly as good (eg at the edges). So far I don't see any 
> discussion of a Compiz style effects plugin system.
> 
> thanks -mike
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-David