[Mesa-dev] Remove classic drivers or fork src/mesa for gallium?

[Dylan Baker]

Quoting Dave Airlie (2019-12-03 18:18:55)
> On Wed, 4 Dec 2019 at 10:39, Marek Olšák <maraeo at gmail.com> wrote:
> >
> > Hi,
> >
> > Here are 2 proposals to simplify and better optimize the GL->Gallium translation.
> >
> > 1) Move classic drivers to a fork of Mesa, and remove them from master. Classic drivers won't share any code with master. glvnd will load them, but glvnd is not ready for this yet.
> >
> > 2) Keep classic drivers. Fork src/mesa for Gallium. I think only mesa/main, mesa/vbo, mesa/program, and drivers/dri/common need to be forked and mesa/state_tracker moved. src/gallium/state-trackers/gl/ can be the target location.
> >
> > Option 2 is more acceptable to people who want to keep classic drivers in the tree and it can be done right now.
> 
> These both seem pretty horrible to me right now. Like i965 still
> supports a lot of hardware that exists right now even if we move to
> iris.
> 
> I sorta feel there should be a
> 3) make life harder for classic drivers and optimise things more for
> gallium add more dd.h entrypoints, force the classic drivers to jump
> through hoops to degallium.

Maybe I'm misunderstanding what you mean, but what I'm hearing you say is
"modify src/mesa so that every single classic driver will have to be churned
significantly or stop working", which sounds much worse than options 1 or 2,
because the main problem with classic is that i965 is the only classic driver
that's really being maintained.

> I don't like forking src/mesa/main/* because really 99% of it is just
> a GL frontend implementation, most bugs in it will be in a fork and
> vice-versa, I'd rather refine the abstraction between mesa and
> backends if possible to reduce the overheads.
> 
> I'm probably not convinced that any benefit is worth accepting 1 or 2
> above, but hey I've been persuaded before to do crazy things.
> 
> Dave.
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