[Mesa3d-dev] [Bug 27286] New: Mod function returns wrong value

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=27286

           Summary: Mod function returns wrong value
           Product: Mesa
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Mesa core
        AssignedTo: mes...@li...
        ReportedBy: kar...@ar...


The following shader returns incorrect output. It looks like the GLSL Compiler
doesnt implement mod correctly.

varying vec var1;
void main (void)
{
        gl_FragColor = vec4(mod(4.0, 2.0), 0.0, 0.0, 1.0);
}

It should be the same as,

varying vec var1;
void main (void)
{
        float var = 4.0 - (2.0 * (floor(4.0/2.0)) ); //According to spec
        gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);
}


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