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: [email protected]
ReportedBy: [email protected]
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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