1 2out vec4 sk_FragColor; 3uniform vec4 colorWhite; 4vec4 main() { 5 vec4 x = colorWhite; 6 for (float r = -5.0;r < 5.0; r += 1.0) { 7 x.x = clamp(r, 0.0, 1.0); 8 if (x.x == 0.0) break; 9 } 10 for (float b = 5.0;b >= 0.0; b -= 1.0) { 11 x.z = b; 12 if (x.w == 1.0) continue; 13 x.y = 0.0; 14 } 15 return x; 16} 17