out vec4 sk_FragColor; uniform float a; uniform float b; uniform float c; uniform vec4 d; uniform vec4 e; vec4 main() { vec4 result = vec4(refract(6e+26, 2.0, 2.0)); result.x = refract(a, b, c); result = refract(d, e, c); result.xy = vec2(0.5, -0.8660254); result.xyz = vec3(0.5, 0.0, -0.8660254); result = vec4(0.5, 0.0, 0.0, -0.8660254); return result; }