1 2out vec4 sk_FragColor; 3uniform vec2 ah; 4uniform vec2 bh; 5uniform vec2 af; 6uniform vec2 bf; 7float cross_hh2h2(vec2 a, vec2 b) { 8 return a.x * b.y - a.y * b.x; 9} 10float cross_ff2f2(vec2 a, vec2 b) { 11 return a.x * b.y - a.y * b.x; 12} 13void main() { 14 sk_FragColor.x = cross_hh2h2(ah, bh); 15 sk_FragColor.y = cross_ff2f2(af, bf); 16} 17