Improving rotated ATI performance

[Roland Scheidegger]

Alex Deucher wrote:
> 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.
Is this really true for all r3xx and r4xx cards? I thought at least some
r4xx cards could do more.

Roland