[Bug 92760] Add FP64 support to the i965 shader backends

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92760

--- Comment #36 from Samuel Iglesias <siglesias at igalia.com> ---
(In reply to Samuel Iglesias from comment #35)
> I found i965 driver is currently running vec4 visitor and generator for
> geometry shaders and we have some crashed/failed tests due to its lack of
> support for doubles. After enabling scalar GS, piglit shows no regressions.
> 

I forgot to mention we are currently focusing on the scalar backend to fix
failed fp64 tests and running the tests on Broadwell (gen8) for now.

By enabling scalar GS in Broadwell by default, we would take advantage of our
previous work to add support for doubles in the scalar backend. Thanks to that
work, scalar GS not only shows no regressions on piglit but also passes the
crashed/failed fp64's geometry shader tests we have seen with vec4 backend.

Then, my question is if we can enable scalar GS in Broadwell by default or if
there are reasons to keep it disabled.

> I would like to know if there is a strong reason to disable scalar GS by
> default (perhaps I am missing something) because then we would need to add
> support for doubles in vec4.

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