Nouveau - Mar 2015 - [Bug 89759] New: WebGL OGL ES GLSL conformance test with mesa drivers fails

https://bugs.freedesktop.org/show_bug.cgi?id=89759

            Bug ID: 89759
           Summary: WebGL OGL ES GLSL conformance test with mesa drivers
                    fails
           Product: Mesa
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: lukebenes at hotmail.com
        QA Contact: nouveau at lists.freedesktop.org

On a GTX 650, the following 2 GLSL tests fail with the nouveau drivers but pass
with the nvidia proprietary driver:

https://www.khronos.org/registry/webgl/conformance-suites/1.0.2/conformance/ogles/GL/functions/functions_001_to_008.html

test: array_float_vert.test.html
FAIL pixel @ (33, 33 was [182,255,255,255] expected [255,255,255,255]

test: array_float_frag.test.html
FAIL pixel @ (33, 33 was [182,255,255,255] expected [255,255,255,255]

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https://bugs.freedesktop.org/show_bug.cgi?id=89759

Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Drivers/DRI/nouveau         |Mesa core
           Assignee|nouveau at lists.freedesktop.o |mesa-dev at
lists.freedesktop.
                   |rg                          |org
         QA Contact|nouveau at lists.freedesktop.o |mesa-dev at
lists.freedesktop.
                   |rg                          |org

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
These also fail on r600. This is probably a st/mesa-level or glsl ir-level
issue. Haven't gotten any confirmation from anyone using i965, but I'm
reassigning this to mesa core.

I suspect that the following is the cause of the trouble:

    b[1] = a[1];
    c[1] += d[1];
    a[1] += 1.0;

If the += 1 gets reordered to before the b[1] = a[1], then we're in trouble.
I
get cyan as the output, with 182 for the first component, which means that

    if(b[1] == 1.0) q += 2.0;

is failing. Haven't quite figured out how to convert these webgl tests into
piglits quite yet, although this one should be easy since it's not
input-dependent.

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