[Intel-gfx] Register "linking"

[Eric Anholt]

On Tue, 12 Jun 2012 12:35:37 +0200, Olivier Galibert <galibert at pobox.com> wrote:
>   Hi guys,
> 
> I'm playing with my gm45, and trying to understand the inter-shader
> register allocation and referencing aspects.  From what I see, the vs
> and clipper follow the brw_vue_map to know where data is.  The
> fragment shader, though, does its own input register allocation in the
> urb_setup array.  How is the link done between the two?  I've been
> unable to find it...

The brw_sf* code takes the vertices from the vue_map and emits code to
generate interpolation coefficients for the InputsRead of the fragment
shader.  Then we can find them in our payload in that order in
fs_visitor::calculate_urb_set().
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