Improving rotated ATI performance

[Alex Deucher]

On Dec 14, 2007 9:25 AM, Jerome Glisse <glisse at freedesktop.org> wrote:
> On Thu, 13 Dec 2007 13:24:22 -0500
> "Alex Deucher" <alexdeucher at gmail.com> wrote:
>
> > On Dec 13, 2007 1:19 PM, Adr3nal D0S <adr3nald0s at gmail.com> wrote:
> > > On Dec 13, 2007 11:37 AM, Alex Deucher <alexdeucher at gmail.com> 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?
> >
> > It depends on the hardware.  r1xx and r2xx had 2048 3d coordinate
> > limits and tiling surface limits.  r3xx/r4xx are 4096.  textures are
> > limited to 2048 on r1xx-r4xx.
>
> Alex would be good if you can double check but r300 hw i got can't
> properly render 3d above 2650x2650 (offset things you can see in the
> drm). As side note fglrx doesn't render properly above this limit.
> So i think we should change advertized viewport size to 2650, i
> will do that soon if no one object with valid arguments.
>

you are right the r3xx r4xx car limited to 2560.  I forgot about that.
 Go ahead and fix that up.

Alex