On Wed, Jun 25, 2014 at 5:38 AM, Juha-Pekka Heikkila <juhapekka.heikk...@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. _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
