[Mesa-dev] [Bug 31986] New: matrix operation broken

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31986

           Summary: matrix operation broken
           Product: Mesa
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
        AssignedTo: mesa-dev at lists.freedesktop.org
        ReportedBy: jiajia.zheng at intel.com


Below shader failed on Calpella (i965) with mesa master:
Probe at (0,0)
  Expected: 0.500000 0.500000 0.500000 0.500000
  Observed: 0.501961 0.501961 0.000000 1.000000
PIGLIT: {'result': 'fail' }


[require]
GL >= 2.0
GLSL >= 1.10

[fragment shader]


void main(void)
{
mat2 m = mat2(0.5, 0.5, 0.5, 0.5);
m[0][0] = m[0][0] + 0.3;
m[0][0] = m[0][0] - 0.3;
     gl_FragColor = vec4(m[0][0], m[0][1], m[1][0], m[1][1]);
}

[test]
draw rect -1 -1 2 2
probe all rgba 0.5 0.5 0.5 0.5

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