[Mesa-dev] [PATCH V3 2/5] i965 Gen4/5: Generalize SF interpolation setup for GLSL1.3

[Paul Berry]

On 30 July 2013 14:06, Chris Forbes <chrisf at ijw.co.nz> wrote:

> On Wed, Jul 31, 2013 at 8:53 AM, Paul Berry <stereotype441 at gmail.com>
> wrote:
> >Can you point me to some VS code that does this?  I thought that if the
> VS wrote only to gl_BackColor, then the VUE map would only contain a slot
> for gl_BackColor.
>
> The VS now does this:
>
> diff --git a/src/mesa/drivers/dri/i965/
> brw_vs.c b/src/mesa/drivers/dri/i965/brw_vs.c
> index 60b40c5..5b8173d 100644
> --- a/src/mesa/drivers/dri/i965/brw_vs.c
> +++ b/src/mesa/drivers/dri/i965/brw_vs.c
> @@ -277,6 +277,12 @@ do_vs_prog(struct brw_context *brw,
>           if (c.key.point_coord_replace & (1 << i))
>              outputs_written |= BITFIELD64_BIT(VARYING_SLOT_TEX0 + i);
>        }
> +
> +      /* if back colors are written, allocate slots for front colors too
> */
> +      if (outputs_written & BITFIELD64_BIT(VARYING_SLOT_BFC0))
> +         outputs_written |= BITFIELD64_BIT(VARYING_SLOT_COL0);
> +      if (outputs_written & BITFIELD64_BIT(VARYING_SLOT_BFC1))
> +         outputs_written |= BITFIELD64_BIT(VARYING_SLOT_COL1);
>     }
>
>     brw_compute_vue_map(brw, &prog_data.base.vue_map, outputs_written,
>

Aha!  That's what I was missing, thanks.
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