[Bug 94442] Add ARB_vertex_attrib_64bit support for the i965 backend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94442

--- Comment #8 from Alejandro Piñeiro (freenode IRC: apinheiro) <apinheiro at igalia.com> ---
New update. 

The support for this extension is mostly finished for gen8. We are just doing
some cleanings, but the functionality would remain the same:
https://github.com/Igalia/mesa/tree/i965-attrib64

We also have a branch that provides the support for gen7:
https://github.com/Igalia/mesa/tree/i965-attrib64-gen7

Having said so, there is still a possibility of the fp64 support for gen7
changing in the future, so it is possible that attrib64 support for gen7 would
need to be adapted for it.

In both cases, there are no regressions doing a full piglit run, neither on
gles3/gles31 dEQP.

Additionally, we also worked on extending the tests specific for this extension
on piglit:
https://github.com/Igalia/piglit/tree/i965-attrib64

For those new tests, there are some failing ones, but they are known cases, as
some of those tests use more attributes that the hw can handle.

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