[pixel shader]
uniform float4 n;
uniform float4 i;
uniform float4 ng;

float4 main() : sv_target
{
    return faceforward(n, i, ng);
}

[test]
uniform 0 float4 10.0 20.0 30.0 40.0
uniform 4 float4 1.0 0.0 0.0 0.0
uniform 8 float4 1.0 0.2 0.0 0.0
todo(msl) draw quad
probe (0, 0) rgba (-10.0, -20.0, -30.0, -40.0)

uniform 0 float4 10.0 20.0 30.0 40.0
uniform 4 float4 1.0 0.0 0.0 0.0
uniform 8 float4 1.0 -0.2 0.0 0.0
todo(msl) draw quad
probe (0, 0) rgba (-10.0, -20.0, -30.0, -40.0)

uniform 0 float4 10.0 20.0 30.0 40.0
uniform 4 float4 1.0 0.0 0.0 0.0
uniform 8 float4 -1.0 0.0 0.0 0.0
todo(msl) draw quad
probe (0, 0) rgba (10.0, 20.0, 30.0, 40.0)

uniform 0 float4 10.0 20.0 30.0 40.0
uniform 4 float4 0.0 -1.0 0.0 0.0
uniform 8 float4 0.0 1.0 0.0 0.0
todo(msl) draw quad
probe (0, 0) rgba (10.0, 20.0, 30.0, 40.0)

uniform 0 float4 10.0 20.0 30.0 40.0
uniform 4 float4 1.0 0.0 0.0 0.0
uniform 8 float4 0.0 1.0 0.0 0.0
todo(msl) draw quad
probe (0, 0) rgba (-10.0, -20.0, -30.0, -40.0)

uniform 0 float4 10.0 20.0 30.0 40.0
uniform 4 float4 0.0 0.0 0.0 0.0
uniform 8 float4 0.0 1.0 0.0 0.0
todo(msl) draw quad
probe (0, 0) rgba (-10.0, -20.0, -30.0, -40.0)

uniform 0 float4 10.0 20.0 30.0 40.0
uniform 4 float4 0.0 0.0 0.0 0.0
uniform 8 float4 0.0 0.0 0.0 0.0
todo(msl) draw quad
probe (0, 0) rgba (-10.0, -20.0, -30.0, -40.0)