Re: [Mesa3d-dev] [PATCH] intel: Expose more FBconfigs in the 3D driver.

[Peter C. <pc...@ca...>]

On Thu, 2009-01-29 at 15:08 -0800, Eric Anholt wrote:
> We can support any combination of (a8r8g8b8, x8r8g8b8, r5g6b5) x (z0,z24,z24s8)
> on either class of chipsets.  The only restriction is no mixing bpp when also
> mixing tiling.  This shouldn't be occurring currently.

Slightly hijacking, since this isn't a direct comment on the above
patch..

I think it might be useful to expose some combinations with 0 alpha
bits. If we don't, there is no obvious way of flagging when you're
mapping a 24bit depth X Pixmap onto a texture.

The setTexBuffer hook can look at the fbconfig of the GLXPixmap the
texture is targeting, but can't (as far as I could figure out) inspect
what format the X server knows the data is in (we have "cpp" from DRI2,
but that doesn't tell us if the alpha channel is used or not).

-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)