[Piglit] [PATCH 1/8] layered-rendering/blit: use color other than the default red

[Kenneth Graunke]

On 01/26/2014 01:34 AM, Topi Pohjolainen wrote:
> Passes on nvidia and on IVB using blt-engine and mesa fallback
> path but fails on IVB using blorp (both before and after the
> recent refactoring):
> 
> Probe color at (32,0)
>   Expected: 0.500000 0.400000 0.300000
>   Observed: 0.250980 0.160784 0.090196
> Probe color at (96,0)
>   Expected: 0.500000 0.400000 0.300000
>   Observed: 0.250980 0.160784 0.090196
> Probe color at (32,64)
>   Expected: 0.500000 0.400000 0.300000
>   Observed: 0.250980 0.160784 0.090196
> Probe color at (96,64)
>   Expected: 0.500000 0.400000 0.300000
>   Observed: 0.250980 0.160784 0.090196

This looks a lot like botched SRGB handling.  I saw BlitFramebuffers
with a source format of XRGB8888 and a destination format of SRGB8.
Commenting out the A -> 1.0 override in gen6_blorp_emit_blend_state
makes the test pass, so something's probably broken around there...

Good luck!

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