[Mesa-dev] Change in Mesa triggers bug in Firefox Nightly with WebRender on old AMD hardware

[Dave Airlie]

On Wed, 1 May 2019 at 12:34, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
>
> On Tue, Apr 30, 2019 at 10:42 AM Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> >
> > On Tue, Apr 30, 2019 at 2:48 AM Dave Airlie <airlied at gmail.com> wrote:
> > >
> > > On Tue, 30 Apr 2019 at 08:47, Dave Airlie <airlied at gmail.com> wrote:
> > > >
> > > > On Tue, 30 Apr 2019 at 08:42, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> > > > >
> > > > > Thing is, I think that would not be enough - with the "recent" (like
> > > > > past 2 years) CSO/state change detection changes, I think that you can
> > > > > end up with no sampler set for a buffer view. Perhaps someone with the
> > > > > hw can investigate what goes wrong?
> > > >
> > > > I'm trying to get a live r600/700 machine, I plugged in my rv635 and
> > > > rv740 gpus, and they both seemed toast, I've got an rv635 laptop I'll
> > > > try and get up to date.
> > >
> > > I've found a working rv770 and reproduced it here. This isn't an
> > > indication I'll get to fix it soon, but I will try.
> >
> > When I was debugging this issue on nouveau (and trying to nail down
> > specifically what didn't work and what was required to make it work),
> > I found that using a gallium test to debug this made the issues at
> > hand quite obvious, and I didn't have to worry about how to force the
> > st to assign mappings here or there for views or samplers. I'm not
> > sure if I still have those left over, but I'll have a look tonight.
> > They're also not terribly difficult to write.
>
> In case it's helpful:
> https://people.freedesktop.org/~imirkin/tbo-tex.c which fits together
> with the other gallium/tests/trivial ones.
>
> I think there were associated Makefile.am changes, but with the
> removal of autoconf, I probably lost the local changes.
>
> In its current form, it doesn't create a sampler, but you can see how
> trivial/quad-tex.c does it if you want to play around with having
> samplers around. You might also have to use PIPE_FORMAT_R8G8B8A8_UNORM
> instead of the BGRA variant for the view's format (iirc r600 has some
> limitations around swizzling and buffer textures).
>

Thanks for test, but I ended up installing firefox and watching the
pain, then found it by accident.

https://patchwork.freedesktop.org/patch/302675/

For Viktor to test.

Dave.