[Mesa-dev] [PATCH] i965/blorp: do not use unnecessary hw-blending support

[Eric Anholt]

Topi Pohjolainen <topi.pohjolainen at intel.com> writes:

> This is really not needed as blorp blit programs already sample
> XRGB normally and get alpha channel set to 1.0 automatically by
> the sampler engine. This is simply copied directly to the payload
> of the render target write message and hence there is no need for
> any additional blending support from the pixel processing pipeline.
>
> Fixes recently modified piglit test gl-3.2-layered-rendering-blit
> on IVB. No regressions on IVB.

What about when you have a RGB-but-not-alpha gl format that's been
promoted to an ARGB Mesa and BRW surface format by texformat.c?  I don't
think blorp's samplers have any overrides going on there.
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