[Mesa-dev] Fwd: [Mesa-users] Issues with removal of classic OSMesa

Dave Airlie airlied at gmail.com
Tue Feb 2 05:44:50 UTC 2021

On Mon, 1 Feb 2021 at 16:50, Dave Airlie <airlied at gmail.com> wrote:
> On Thu, 7 Jan 2021 at 21:11, Andreas Fänger <a.faenger at e-sign.com> wrote:
> >
> > >> don’t know why the current softpipe/swrast implementation shouldn’t be conformant.
> >
> > >Interesting I hadn't known we had a correct impl in mesa, the features.txt has said "softpipe and llvmpipe advertise 16x anisotropy but simply ignore the setting"
> > >so I never dug any deeper. I'll consider a port of this to llvmpipe at some point, making it efficient might be tricky.
> >
> > It seems that features.txt hasn't been updated regarding this functionality; softpipe has "real" anisotropy since 2011.
> >
> > > I'll consider a port of this to llvmpipe at some point, making it efficient might be tricky.
> > That would be great. As anisotropic filtering is often an option which can be set by a user, I guess most people turn it off to get higher framerates. But in our use case, high quality renderings are required, so we accept the longer render times to get the best quality; hopefully a llvmpipe port would be faster than the old swrast implementation (we are only using the fixed rendering pipeline/no shaders in conjunction with the OpenMP patch for speeding up GL_POLYGON_SMOOTH_HINT)
> >
> > Andreas
> https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8804
> Is my first pass at writing the code for this I've no idea if this is
> anyway correct, but I'm just letting everyone know I've started
> working on it, and mipmap_tunnel doesn't look immediately wrong.

Olay the code in the MR above seems to work in most cases now and
seems to operate like softpipe.

However I'm seeing a trace failure

that worries me that maybe the softpipe code isn't great, I'm going to
try and reproduce the traces on softpipe locally to see how they look.

I'd appreciate any testing that can be given to this code by preexisting users.


> Dave.

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