Improving rotated ATI performance

Adr3nal D0S adr3nald0s at
Thu Dec 13 10:19:52 PST 2007

On Dec 13, 2007 11:37 AM, Alex Deucher <alexdeucher at> wrote:

> rotation can use EXA composite to accelerate transforms, so you'll
> have to use EXA.  For r1xx-r2xx the composite code is written, but
> there are some bug when doing transforms, so it doesn't work properly
> for rotation.  for r3xx and newer, the code needs to be written.
> there should be enough info available for r3xx-r4xx in the 3D driver
> to add composite support, but no one has done the work yet.

I've done a fair amount of OpenGL over the years, but haven't dealt
with 3D much at the hardware level.  Am I correct that 3D acceleration
only works up to a maximum virtual size of 2048x2048? If so, does this
mean it would be impossible to have accelerated compositing under EXA
for larger virtuals?

Not that I am actually capable of pulling this off or have the time to
do so.  But, if it might work for my configuration, I might consider
looking at it sometime.

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