[Xorg-driver-geode] Glyph rendering

[Michel Dänzer]

On Mit, 2010-07-21 at 11:27 +0800, Huang, FrankR wrote: 
> 
> I am trying to use ARGB to play a trick to do the PICT_a8 add. From
> the debug, the memory space add value is right. But the final result
> is not correct.

It might be possible to pull this off if the hardware supports a
writemask for the ARGB destination.


> Then I wrote a function to do the PICT_a8 add operation( MAX(x+y,
> 255)), the result is right. And the performance has grown up to
> 23700/s. It is same as using "NoAccel" way:).

That still seems rather low though - radeon/intel/nouveau drivers easily
get beyond 10x that. I suspect you could also get much better still if
you can eliminate any software rendering and other GPU pipeline stalls.


-- 
Earthling Michel Dänzer           |                http://www.vmware.com
Libre software enthusiast         |          Debian, X and DRI developer