Mailinglist Archive: radeonhd (307 mails)

[Alex Deucher <alexdeucher@xxxxxxxxx>]

On Tue, Feb 3, 2009 at 2:00 PM, manuel gysin <gwydion.dot@xxxxxxxxxxx> wrote:
> Hi Clemens and Matthias,
>
> > Hi,
> >
> > Great that you are interested in enhancing the R600 driver :)
> >
> > Well, XAA has more or less been declared as "dead", intel plans for a
> > long time to get rid of it.
> > I would not recommend putting effort into it, its just not well suited
> > for todays requirements.
> >
> > Two other interesting (but I guess hard parts) but be Gradient and
> > Trapezoid accaleration for EXA ;)
> >
> > Thanks again for working on it, Clemens
>
> Ok, then it's wasted time to start with XAA.
> I think my time is better used when helping in some oss project then do some
> other senseless stuff. ;-)
> And I'm totally pissed of about closed source drivers since years.
>
> > XAA is. Read Alex r6xx-r7xx-support branch, it contains EXA
> > acceleration, or better, a start of EXA. That will give you some ideas.
> >
> > I'll be working on Mesa next week again, this week I have to prepare two
> > FOSDEM talks...
>
> Ok, I think I speak with Alex. Maybe he can give me some tasks.
> Have fun on FOSDEM (I have no time to go there :/)!

Your best bet for playing with accel stuff is the EXA/Xv code.  There
are still some issues with it:

- Using shader constants on r7xx seems to cause lockups in some cases
- Some corruption with text and small pixmaps (I think this is cache
flush related)

and there is a lot of room for optimization:

- Xv shaders could be optimized to deal with YUV formats directly
rather than converting everything to nv12
- Overlapping blits could be optimized (currently done line by line)
- Add support for UploadToScreen() and DownloadFromScreen() EXA hooks
(basically a textured blit to/from a gart buffer to/from vram)

Alex
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