[Mesa-dev] Intel: Please help define the common rectangle primitive type

[Marek Olšák]

On Fri, Aug 5, 2016 at 1:22 AM, Kenneth Graunke <kenneth at whitecape.org> wrote:
> On Thursday, August 4, 2016 11:28:28 AM PDT Jason Ekstrand wrote:
>> > > - No cut index (GS is supposed to be fine and Tess looks OK too)
>> >
>> > I'd be OK with dropping GS and Tess support for rectangles.
>>
>> I don't know that we need to but the docs say cut index doesn't work.
>
> Perhaps we should throw a GL error when using rectangles if primitive
> restart (i.e. cut index) is enabled.
>
> I could potentially see GS being useful - maybe someone would want
> to do layered rendering with rectangles, and generate rectangles
> for each?  Tessellation on rectangles seems pretty nonsensical.

AMD_vertex_shader_layer is better IMO. I don't think we can do GS + rectangles.

The last remaining thing is whether the order of vertices matters for Intel.

Marek