void main() { float4 c0 = Sample(); float red = 0.0; float green = 0.0; float blue = 0.0; if (c0.r > 0.25) red = c0.r; if (c0.g > 0.25) green = c0.g; if (c0.b > 0.25) blue = c0.b; SetOutput(float4(red, green, blue, 1.0)); }