[Mesa-dev] [PATCH 1/3] gallium: add per-sample interpolation control into rasterizer state

[Ilia Mirkin]

On Fri, Oct 2, 2015 at 1:48 PM, Marek Olšák <maraeo at gmail.com> wrote:
> On Fri, Oct 2, 2015 at 4:12 PM, Roland Scheidegger <sroland at vmware.com> wrote:
>> Am 02.10.2015 um 12:19 schrieb Marek Olšák:
>>> On Fri, Oct 2, 2015 at 3:13 AM, Roland Scheidegger <sroland at vmware.com> wrote:
>>>> Can't say I'm a big fan of doing essentially the same thing with
>>>> different methods, but well it's coming from GL, and if it helps some
>>>> drivers...
>>>>
>>>> Acked-by: Roland Scheidegger <sroland at vmware.com>
>>>
>>> If all drivers start supporting the CAP, we could remove the st/mesa
>>> emulation. Just as we could remove the color clamping emulation.
>>>
>>> Marek
>>>
>>
>> Yes, but that just moves the logic to the drivers. It's still (mostly)
>> the same thing handling per-sample inputs, or forcing them to per sample
>> via ARB_sample_shading.
>
> Yes, that's the main point. For performance, we should do the
> translation to TGSI at link time, so that the GLSL->TGSI overhead can
> be removed from draw calls. Because of that, all shader state
> dependencies should be moved to and implemented/emulated in drivers.
> This will be difficult to do because of the lack of interest from
> other driver maintainers, therefore we need CAPs until they realize
> it's good for them too.

In case that was directed at me, I realize it's good for me too. I
just don't know if I can do it on your schedule and I'd rather nouveau
not be broken in the meanwhile :)

  -ilia