[Bug 103616] Increased difference from reference image in shaders

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Nov 8 08:00:53 UTC 2017


            Bug ID: 103616
           Summary: Increased difference from reference image in shaders
           Product: Mesa
           Version: 17.2
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: b7.10110111 at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

After commit 4009a9ead490ef1718e6fa83141aa086a43cd901 (found by git-bisect,
double-checked by git-revert) I get two failures of the integration_test in
precomputed_atmospheric_scattering demo [1]. The tests there compare reference
CPU-generated image with the one generated with GLSL code, checking that PSNR
is high enough. Before the above commit they all passed. Now the tests failing

47 is not less than 46.7812
[ FAIL ] ModelTest RadianceSeparateTextures
46 is not less than 45.6379
[ FAIL ] ModelTest RadianceCombineTextures

I tested on Xeon E3-1226 v3 built-in GPU, as well as on Core i7-4765T built-in
GPU, with the exact same results.

I'm not sure if this is an expected decrease in precision, but it seems strange
to me: from the commit message I get that the code transformation introduced
should be equivalent. Apparently it's not, or there may be a bug somewhere.

[1]: https://github.com/ebruneton/precomputed_atmospheric_scattering

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