out vec4 sk_FragColor; in vec2 a; in vec4 b; void main() { sk_FragColor.x = float(packHalf2x16(a)); sk_FragColor.x = float(packUnorm2x16(a)); sk_FragColor.x = float(packSnorm2x16(a)); sk_FragColor.x = float(packUnorm4x8(b)); sk_FragColor.x = float(packSnorm4x8(b)); }