[Mesa-dev] Difference between TransformFeedback Gallium <-> Vulkan (V3D)

[Dave Airlie]

On Tue, 27 Aug 2019 at 09:03, Andreas Bergmeier <abergmeier at gmx.net> wrote:
>
> > Be warned that the way the Intel streamout hardware works is really weird.  It's designed from the perspective of something walking a buffer and trying to figure out which outputs to grab.  This is completely backwards (or inside-out, whichever is weirder) from the API which is written from the perspective of a shader shoving data into a buffer.  If you're looking at the ANV code, it's really easy to get turned around.
>
> Thanks. Currently I am trying to orient on Intel, since it
> a, seems the closest non-capability wise and
> b, if push comes to shove, I might be able to compile a new libvulkanintel.so and start tracing with that
>
> What do you think would be the better reference? RADV?

One thing to remember is you don't need XFB for a conformant vulkan
driver, the extension isn't even an official one. It's probably the
last place to start :-)

Dave.