https://bugs.freedesktop.org/show_bug.cgi?id=67692
Priority: medium
Bug ID: 67692
Keywords: regression
CC: [email protected]
Assignee: [email protected]
Summary: [llvmpipe] piglit glsl-fs-frontfacing regression
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: [email protected]
Hardware: x86-64 (AMD64)
Status: NEW
Version: git
Component: Other
Product: Mesa
mesa: bff0d87668538196a2d3ef1400382e4deb0e0435 (master)
$ ./bin/shader_runner tests/shaders/glsl-fs-frontfacing.shader_test -auto
Probe color at (0,0)
Expected: 0.000000 1.000000 0.000000 0.000000
Observed: 0.000000 0.501961 0.501961 0.000000
Probe color at (249,0)
Expected: 0.000000 1.000000 0.000000 0.000000
Observed: 0.000000 0.501961 0.501961 0.000000
PIGLIT: {'result': 'fail' }
2d15f4746ba4c5d0146912550442b96386e4a32d is the first bad commit
commit 2d15f4746ba4c5d0146912550442b96386e4a32d
Author: Zack Rusin <[email protected]>
Date: Fri Aug 2 15:50:16 2013 -0400
llvmpipe: make the front-face behavior match the gallium spec
The spec says that front-face is true if the value is >0 and false
if it's <0. To make sure that we follow the spec, lets just
subtract 0.5 from our value (llvmpipe did 1 for frontface and 0
otherwise), which will get us a positive num for frontface and
negative for backface.
Signed-off-by: Zack Rusin <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>
Reviewed-by: Jose Fonseca <[email protected]>
:040000 040000 2ada90b3a1da549c955add2ee247bf564f4964b8
f47d0cb938eee9fb413f71518c6afa1ad9fce5b9 M src
bisect run success
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