1 2out vec4 sk_FragColor; 3uniform float a; 4uniform float b; 5uniform float c; 6uniform vec4 d; 7uniform vec4 e; 8uniform vec4 f; 9void main() { 10 sk_FragColor.x = faceforward(a, b, c); 11 sk_FragColor = faceforward(d, e, f); 12} 13