[Mesa-dev] [PATCH 2/2] st/mesa: add GL_ARB_shader_atomic_counter_ops support

[Ilia Mirkin]

On Thu, Mar 10, 2016 at 10:57 AM, Nicolai Hähnle <nhaehnle at gmail.com> wrote:
>> -   if (c->MaxCombinedAtomicBuffers > 0)
>> +   if (c->MaxCombinedAtomicBuffers > 0) {
>>         extensions->ARB_shader_atomic_counters = GL_TRUE;
>> +      extensions->ARB_shader_atomic_counter_ops = GL_TRUE;
>> +   }
>
>
> I believe there's pre-GCN AMD hardware which can support atomic counters but
> not atomic_counter_ops (at least according to what the closed driver
> exposes, I haven't actually checked the docs), so there should probably be a
> capability flag here.

I assumed this was due to laziness... seems odd if the SSBO atomic ops
can be supported, but those same ops can't be supported on atomic
buffers. Glenn / Dave - do you guys happen to know what the pre-GCN hw
is capable of?

  -ilia