[Mesa-dev] [PATCH] drirc: add option to disable ARB_draw_indirect

[Emil Velikov]

Hi Rob,

On 5 December 2017 at 12:54, Rob Clark <robdclark at gmail.com> wrote:
> This is a bit sad/annoying.  But with current GPU firmware (at least on
> a5xx) we can support both draw-indirect and base-instance.  But we can't
> support draw-indirect with a non-zero base-instance specified.  So add a
> driconf option to hide the extension from games that are known to use
> both.
>
> Signed-off-by: Rob Clark <robdclark at gmail.com>
> ---
> Tbh, I'm also not really sure what to do when/if we got updated firmware
> which handled draw-indirect with base-instance, since we'd need to make
> this option conditional on fw version.  For STK that probably isn't a
> big deal since it doesn't use draw-indirect in a particularly useful way
> (the indirect buffer is generated on CPU).
>
Couldn't freedreno just return 0 for PIPE_CAP_DRAW_INDIRECT (aka
disable the extension) as it detects buggy FW?
This is what radeons have been doing as they encounter iffy firmware or LLVM.

AFAICT freedreno doesn't do GL 4.0 or GLES 3.1 so one should be safe.

-Emil