[Mesa-dev] [PATCH 0/5] Gallium: Passing drirc options to create_screen() and fixing Rocket League

[Roland Scheidegger]

Am 22.06.2017 um 19:35 schrieb Ilia Mirkin:
> On Wed, Jun 21, 2017 at 9:58 AM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
>> On Tue, Jun 20, 2017 at 6:54 PM, Marek Olšák <maraeo at gmail.com> wrote:
>>> The first pipe_screen flag is a drirc option to fix incorrect grass
>>> rendering in Rocket League for radeonsi. Rocket League expects DirectX
>>> behavior for partial derivative computations after discard/kill, but
>>> radeonsi implements the more efficient but stricter OpenGL behavior
>>> and that will remain our default behavior. The new screen flag forces
>>> radeonsi to use the DX behavior for that game.
>>
>> For those of us following along at home... can you provide a brief
>> reminder of what the DX behavior is, and how does it differ from GL
>> behavior? In case one might want to fix this for nouveau (if a fix is
>> needed at all)...
> 
> From what I gather, this is the difference between discard exiting
> immediately in that thread and keeping going.
> 
> Does this make sense to be surfaced in gallium via a tgsi program
> property? That way, e.g. a GL extension could be written to expose
> that program property.

I suppose it would make sense, that way this could be exposed cleanly.
But of course the apps would have to use the extension, otherwise the
override is just in a different place (and in theory not just glsl,
vulkan works the same too).

Roland



>   -ilia
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