[Mesa-dev] [PATCH 00/26] RadeonSI: Primitive culling with async compute

[Marek Olšák]

On Wed, Feb 13, 2019 at 2:28 AM Axel Davy <davyaxel0 at gmail.com> wrote:

> On 13/02/2019 06:15, Marek Olšák wrote:
> > I decided to enable this optimization on all Pro graphics cards.
> > The reason is that I haven't had time to benchmark games.
> > This decision may be changed based on community feedback, etc.
>
>
> Could the decision to run the optimization be based on some perf
> counters related to culling ? If enough vertices are culled, you'd
> enable the optimization.
>

No, that's not possible. When I enable this, all gfx counters and pipeline
statistics report that (almost) no primitives are culled, because the
compute shader culls them before the gfx pipeline.


>
> There seems to be an AMD patent on the optimization, I failed to see it
> mentioned, maybe it should be pointed out somewhere.
>

Unlikely. It's based on this:
https://frostbite-wp-prd.s3.amazonaws.com/wp-content/uploads/2016/03/29204330/GDC_2016_Compute.pdf

And this is pretty much a simpler version of what I implemented:
https://gpuopen.com/gaming-product/geometryfx/

Marek
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