[compiz] [PATCH] Use-Copy for Compiz - Non-Texture-From-Pixmaps rendering

[Martin Szulecki]

On Mon, 2007-07-09 at 19:14 +0100, Diogo Ferreira wrote:
> On Mon, 2007-07-09 at 18:02 +0200, Treviño wrote:
> > Some weeks ago one of my friends asked me to port the "use-copy"
> > (non-tfp) beryl's feature to Compiz since he wasn't able to run compiz
> > (fusion) smoothly in his nvidia card with turbocache (these cards works
> > well only using Xgl, otherwise they are affected by the [in]famous
> > "Black Window Bug". That's obiouvsly an error that nVidia should fix,

A general question.

This whole "copy-rendering" issue only comes up because NVIDIA, as the
only vendor, implemented an experimental TFP implementation, right?

Afaik. if they never had released it, nobody would be demanding it (nor
blame them for something with a "Black Window Bug" which no other vendor
has implemented).

I fail to understand why "copy-rendering" is required as on any other
vendor you have to go either XGL or AIGLX ending up with a totally
working Compiz environment aside of the copy path being way slower than
the former two "correct" solutions for composited environments.

Maybe someone might (feel the need to) explain that to me? :)

Cheers

--- M.S.