[pixel shader]
uniform float4 u;

float4 main() : sv_target
{
    return float4(fmod(u.x, u.y), 0, 0, 0);
}

[test]
uniform 0 float4 -0.5 6.5 0.0 0.0
draw quad
probe (0, 0) rgba (-0.5, 0.0, 0.0, 0.0) 4
uniform 0 float4 1.1 0.3 0.0 0.0
draw quad
probe (0, 0) rgba (0.2, 0.0, 0.0, 0.0) 4

[pixel shader]
uniform float4 u;

float4 main() : sv_target
{
    return float4(fmod(u.xy, u.z), 0, 0);
}

[test]
uniform 0 float4 -0.5 6.5 2.0 0.0
draw quad
probe (0, 0) rgba (-0.5, 0.5, 0.0, 0.0) 4
uniform 0 float4 1.1 0.3 3.0 0.0
draw quad
probe (0, 0) rgba (1.1, 0.3, 0.0, 0.0) 4
