[Mesa-dev] [PATCH 0/6] Add support for GL_NV_fill_rectangle

Alex Deucher alexdeucher at gmail.com
Thu Mar 23 19:01:29 UTC 2017


On Thu, Mar 23, 2017 at 2:57 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> On Thu, Mar 23, 2017 at 2:45 PM, Lyude Paul <lyude at redhat.com> wrote:
>> On Thu, 2017-03-23 at 14:22 -0400, Alex Deucher wrote:
>>> On Thu, Mar 23, 2017 at 2:18 PM, Marek Olšák <maraeo at gmail.com>
>>> wrote:
>>> > Is there any user of this extension?
>>>
>>> Based on the spec, it seems like it would be useful for glamor.  No
>>> idea is anyone has code to use it yet.
>> Actually me, robclark and airlied were talking specifically about using
>> this for glamor and trying to implement it on other platforms using
>> rectangular primitives. No idea if that'll work (especially since I'm
>> new here), but it sounds promising enough to try :).
>>
>> Once I get this patch series upstream I'll probably look into writing
>> an implementation for softpipe and some other drivers
>
> Seems like there are a bunch of ways of achieving the same thing,
> namely a rectangle being drawn:
>  - new rectangle primitive

Didn't Marek send out an RFC for a rectangle interface, at least in
gallium at some point recently?

Alex

>  - NV_fill_rectangle
>  - EXT_window_rectangles or scissors + overdrawn triangle
>
> The latter only works for a single rectangle, but I doubt it's too
> useful to have multiple ones drawn anyways.
>
> I've already implemented EXT_window_rectangles on nouveau, and my
> understanding is that it should be easy on SI+. This support goes back
> to nv50, and with minor modifications to the ext, could go as far back
> as nv30, if not earlier. (As-is it requires something semi-silly which
> prevents implementation there.)
>
> NV_fill_rectangle functionality is only available on GM200+, which are
> quite recent GPUs (GTX 950+). I'm not aware of a way to do rectangle
> primitives on NVIDIA GPUs (i.e. specifying them as 3 points) without
> NV_fill_rectangle functionality. All NVIDIA GPUs do support QUADS, but
> I'm not sure if they're rasterized in one go or two.
>
> None of this is for or against any particular approach, merely
> providing some information.
>
> Cheers,
>
>   -ilia


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