[Bug 89580] Implement a NIR -> vec4 pass

[bugzilla-daemon at freedesktop.org]

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

--- Comment #13 from Kenneth Graunke <kenneth at whitecape.org> ---
Yeah, that definitely looks bizarre - but I think it's expected.

Fixed-function vertex programs and ARB programs go through prog_to_nir.c (the
Mesa IR -> NIR translator), which generates load_uniform intrinsics directly,
instead of creating uniform variables then having nir_lower_io lower variable
access to intrinsics.  It just sets nir->num_uniforms directly, and brw_nir.c
skips the part that inspects uniform variables when dealing with FF/ARB
programs.

   /* Set the number of uniforms */
   shader->num_uniforms = 4 * c->prog->Parameters->NumParameters;

Sorry for the confusion :)

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