[Bug 89580] Implement a NIR -> vec4 pass

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89580

--- Comment #27 from Kenneth Graunke <kenneth at whitecape.org> ---
(In reply to Jason Ekstrand from comment #26)
> It sounded, from what you said above, like you had already modified
> nir_lower_io to handle vec4.  If that's  the case just go ahead and do the
> rename and add the vec4 version.  No reason to wait for me or Connor to do
> it.

Yeah, I think your approach is great.

Instead of passing a gl_shader_stage and checking for != MESA_SHADER_FRAGMENT,
we should just pass a boolean indicating whether we should make things scalar
or pad to vec4s.  Or have nir_lower_io_scalar and nir_lower_io_vec4 functions
(effectively the same thing).

That way, i965's scalar-or-not choices aren't baked into the generic code, and
everybody can pick what they want.

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