uniform half4 pos1, pos2; uniform half4 colorGreen, colorRed; half4 main(float2 coords) { const half4 constPos1 = half4(8, -3, 4, 14); const half4 constPos2 = half4(5, -3, 0, 2); half4 expected = half4(3, 3, 5, 13); return (distance(pos1.x, pos2.x) == expected.x && distance(pos1.xy, pos2.xy) == expected.y && distance(pos1.xyz, pos2.xyz) == expected.z && distance(pos1.xyzw, pos2.xyzw) == expected.w && distance(constPos1.x, constPos2.x) == expected.x && distance(constPos1.xy, constPos2.xy) == expected.y && distance(constPos1.xyz, constPos2.xyz) == expected.z && distance(constPos1.xyzw, constPos2.xyzw) == expected.w) ? colorGreen : colorRed; }