Register "linking"

Register "linking"

[Olivier Galibert]

  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...

Best,

  OG.

Re: Register "linking"

[Eric Anholt]

[-- Attachment #1.1: Type: text/plain, Size: 722 bytes --]

On Tue, 12 Jun 2012 12:35:37 +0200, Olivier Galibert <galibert@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().

[-- Attachment #1.2: Type: application/pgp-signature, Size: 197 bytes --]

[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx