[Mesa-dev] [PATCH 0/6] Enable Pixman for Mesa

[Juha-Pekka Heikkila]

On 25.06.2014 23:47, Matt Turner wrote:
> On Wed, Jun 25, 2014 at 5:38 AM, Juha-Pekka Heikkila
> <juhapekka.heikkila at gmail.com> wrote:
>> This is my old set which enable using Pixman on Mesa for some texture
>> conversion fast paths. As is this passes Piglit quick set on my IVB.
> 
> Pixman doesn't actually have fast paths for swizzling, like we're
> using in this series. I imagine improvements we're seeing here are
> simply because Mesa's code is slow.
> 
> I never pursued this idea for a couple of reasons. One is that we
> should probably use the GPU to do the conversions in the ideal case.
> Also, pixman doesn't support floating-point formats. Some work has
> been done in the last year or so to make this much easier to implement
> though.
> 
> The first reason above shouldn't block other improvements, and the
> second reason is fixable with some contributions to pixman. And pixman
> is really a trivial dependency, so that shouldn't be a problem.
> 
> Soren thinks this is worth doing and I trust him.
> 
> I think a worthwhile goal would be to add support to pixman for doing
> a bunch of the conversions Mesa requires and then dropping the code in
> Mesa. Are you interested in doing that? I know Jason (Cc'd) is working
> on cleaning up a bunch of this code.
> 
> Are you planning to contribute swizzling fast paths to pixman? The
> power-of-two-sized-component formats should be really easy to optimize
> using the SSE shuffle instructions.
> 

Hi Matt, Jason,

Which parts of texture conversion are you Jason touching, does your
changes overlap with the patches I put here?

As for doing (more) Pixmanization for Mesa on this part I think I can do
it and start to look into making patches for Pixman to support Mesa
better. I hope to be away from keyboards for few weeks so it'll be
August when I start anything on this.

/Juha-Pekka