[Mesa-dev] [PATCH] mesa gallium: use compute shaders for vaapi blit

[Ilia Mirkin]

On Wed, Apr 3, 2019 at 8:38 AM Marek Olšák <maraeo at gmail.com> wrote:
>
> On Tue, Apr 2, 2019 at 2:14 PM Eric Anholt <eric at anholt.net> wrote:
>>
>> Ilia Mirkin <imirkin at alum.mit.edu> writes:
>>
>> > Shouldn't this sort of decision be left up to the driver? If the
>> > driver would like to use CS for blits, fine, but why not let it blit
>> > in the most optimal way possible and force it to use a compute shader?
>>
>> Yeah, commit messages require an explanation of why a change is being
>> made.
>
>
> We plan to create vaapi contexts with PIPE_CONTEXT_COMPUTE_ONLY for better GPU multitasking.
>
> RadeonSI uses async compute queues if PIPE_CONTEXT_COMPUTE_ONLY is set, so it can't do any graphics stuff, not even blit. (pipe_context::blit is NULL)

Makes sense. Sounds like one of those would be a better condition than
the mere existence of compute support then?

  -ilia