On 16 September 2011 09:01, Marek Olšák <mar...@gmail.com> wrote:
> Hi Paul,
>
> this commit breaks the piglit test
> shaders/glsl-arb-fragment-coord-conventions on softpipe and r600g:
>
> bin/glsl-arb-fragment-coord-conventions -auto
> Regular gl_FragCoord
> Pixel center half integer
> Pixel center integer
> Probe at (0,0)
> Expected: 0.250000 0.250000 0.000000
> Observed: 0.749020 0.749020 0.000000
> Probe at (99,99)
> Expected: 0.250000 0.250000 0.000000
> Observed: 0.749020 0.749020 0.000000
> Pixel origin upper left
> Probe at (0,0)
> Expected: 0.000000 1.000000 0.000000
> Observed: 0.003922 0.003922 0.000000
> Probe at (99,99)
> Expected: 1.000000 0.000000 0.000000
> Observed: 0.996078 0.996078 0.000000
> Pixel origin upper left and pixel center integer
> PIGLIT: {'result': 'fail' }
>
> Reverting the commit fixes this. It looks like
> layout(pixel_center_integer) is ignored, because "Pixel center half
> integer" and "Pixel center integer" return the same color in the test.
>
> Do you have any idea what's wrong?
>
> Marek
>
>
Wow, that's surprising, since the commit should only affect what is
considered an error condition; it shouldn't affect the GLSL IR that gets
generated.
I'll do some investigation and let you know what I find.
Paul
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