On Wed, 2009-01-21 at 04:45 +0000, Peter Clifton wrote:
>
> Questions to those who might know..
>
> Should DRI2 be clearing the Alpha channel (even if it requires making a
> copy for these cases)?
It mustn't do this for pixmaps that actually have an alpha channel, and
it shouldn't need to otherwise.
> Should compiz be decorating RGB windows using shadows which require
> RGBA?
I don't think there should be a problem with that; traditionally compiz
doesn't reparent application windows but uses separate drawables for the
decorations.
> Is there some way to fake GL into thinking the non-copied texture from
> DRI2 is in fact RGB, not RGBA, just with a stride of 4 bytes?
That's basically how the DRI1 AIGLX zero-copy tfp code handles this. See
the code calling testTexOffset() in glx/glxdri.c and the corresponding
SetTexOffset hooks in
mesa/src/mesa/drivers/dri/{intel,r200,r300,radeon} . Something similar
should be possible with DRI2.
--
Earthling Michel Dänzer | http://www.vmware.com
Libre software enthusiast | Debian, X and DRI developer
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