[pixel shader]
uniform float4 x;

float4 main() : sv_target
{
    clip(x);
    return x;
}

[test]
uniform 0 float4 1 2 3 4
todo(sm>=6) draw quad
probe all rgba (1, 2, 3, 4)
uniform 0 float4 9 8 7 6
todo(sm>=6) draw quad
probe all rgba (9, 8, 7, 6)
uniform 0 float4 -1 8 7 6
todo(sm>=6) draw quad
probe all rgba (9, 8, 7, 6)
uniform 0 float4 9 0 7 6
todo(sm>=6) draw quad
probe all rgba (9, 0, 7, 6)