out vec4 sk_FragColor; uniform float unknownInput; vec4 main() { vec4 color = vec4(0.0); for (int counter = 0;counter < 10; ++counter) { } for (int counter = 0;counter < 10; ++counter) { } for (int counter = 0;counter < 10; ++counter) { } if (unknownInput == 1.0) color.y = 1.0; if (unknownInput == 2.0) ; else color.w = 1.0; return color; }