[Mesa-dev] [PATCH 07/14] st/mesa: set ctx->Const.SubPixelBits

[Jakob Bornecrantz]

On Thu, Aug 9, 2018 at 12:57 AM Marek Olšák <maraeo at gmail.com> wrote:
>
> From: Marek Olšák <marek.olsak at amd.com>

This patch causes regressions in dEQP[1] on virgl running on a
radeonSI device. Not a lot of drivers set
PIPE_CAP_VIEWPORT_SUBPIXEL_BITS but SubPixelBits is by default set to
4, but this overwrites it without checking if the returned value is
zero or not. Looking around it seems that a lot of other drivers just
returns zero for PIPE_CAP_VIEWPORT_SUBPIXEL_BITS not just virgl, so
this probably causes regressions on more drivers then virgl.

Cheers, Jakob.