[Mesa-dev] [PATCH] radeonsi: add support for viewport array (v2)

Marek Olšák maraeo at gmail.com
Thu Jun 25 14:11:40 PDT 2015

Wait a moment, how did it fail with si_shader_io_get_unique_index? The
function shouldn't be called for ES with the viewport index, because
ES can't pass the output to GS. If it was called, ignoring the
viewport index in si_llvm_emit_es_epilogue should fix it.


On Thu, Jun 25, 2015 at 10:29 PM, Marek Olšák <maraeo at gmail.com> wrote:
> In that case, feel free to push.
> Reviewed-by: Marek Olšák <marek.olsak at amd.com>
> Marek
> On Thu, Jun 25, 2015 at 10:25 PM, Dave Airlie <airlied at gmail.com> wrote:
>> On 26 June 2015 at 00:26, Marek Olšák <maraeo at gmail.com> wrote:
>>> Hi Dave,
>>> The change in si_shader_io_get_unique_index can be dropped. The
>>> function is only used for shaders before GS.
>> Ok okay I was hitting the assert in there for the layer/viewport index cases,
>> but if the patch you pushed to master helps I'll drop it.
>>> This looks good, but I've had a different plan for this feature:
>> Yeah I thought you might, I just wanted to hack something up to see it working
>> since it seems new Dota 2 uses this feature.
>>> I'd like the states to be converted into 2 atoms:
>>> 1 r600_atom for all 16 viewports
>>> 1 r600_atom for all 16 scissors
>>> Each atom should have a bitmask saying which "slots" are dirty. (the same
>>> idea as resource slots)
>>> The "emit" functions should only emit dirty viewports/scissors.
>>> Also, the "emit" functions shouldn't emit non-zero viewports/scissors
>>> if the viewport index isn't written by the hardware VS stage
>>> (si_get_vs_info(sctx)->...). This should keep the same level of
>>> effectiveness as before. When a shader that writes the viewport index
>>> is bound *and* there are any dirty viewports or scissors, that's the
>>> right time to mark the atoms as dirty again, so that non-zero dirty
>>> viewports/scissors are finally emitted.
>> I'm not sure if I'll get to doing more of it, I just had a day at home,
>> and wanted to get up to speed on radeonsi a bit, so I can just leave
>> that here, in case anyone wants to pick it up,
>> Dave.

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