[Mesa-dev] Wrap up of depth 30 patches for nouveau.

[Ilia Mirkin]

The prime case is interesting ... esp since it's all completely
manufactured. NVIDIA can render to both rbg/bgr orderings, and I
suspect other GPUs can too. However for scanout, only one is
supported. I don't have any great suggestions for how to resolve this
cleanly, but figured I'd point it out.

On Fri, May 18, 2018 at 11:32 PM, Mario Kleiner
<mario.kleiner.de at gmail.com> wrote:
> Hi,
>
> this series contains all the remaining patches for depth 30 support
> on nouveau and possible future driver with xBGR2101010 ordering
> instead of the xRGB2101010 ordering already supported since Mesa 18.0.
> These are the ones i obsessively tested with success.
>
> First two patches are Daniel's, which have been reviewed and tested
> by myself, Ilia and Eric, but for some reason Patchwork didn't detect
> the R-b and t-b statements, so i added them to make it easier for it.
>
> The egl/x11 patch is identical to v2, just more tested on ati-ddx to
> make sure the machine agrees with my explanation to v2 of why it should
> work fine.
>
> Patches 4 and 5 are new: 4 Replaces the hard-coding of 2101010 formats
> by actually detecting which formats are supported. Together with patch 5
> that is not only nicer, but may also provide more opportunity to page-flip
> in some cases.
>
> Patch 5 is needed for Prime render offload from a Wayland server to a
> Wayland client running on a different gpu, on at least Intel + NVidia,
> but also helps to enable page-flipping more often. I tested this with
> Weston + depth 30 enablement patches. While render offload always works
> now, for page flipping (zero-copy present) i needed to disable the new
> dmabuf-import path atm. on some gpu's, as Weston's current dmabuf import
> and/or atomic modesetting is not yet ready to always allow page-flipping.
> But that's a todo for Weston, this patch just enables it in principle.
>
> What is still missing in Mesa is proper Prime offload under regular X
> between gpu's with mismatched channel ordering like Intel + NVidia, ie.
> the equivalent of patches 4 and 5 for X11. Atm. render offload would simply
> display with swapped red and blue channels in such a case. I probably
> won't have time or ideas to look into this within the next month or two.
>
> Thanks,
> -mario
>