| ### Compilation failed: | |
| error: 3: 'main' must return: 'vec4', 'float4', or 'half4' | |
| void main() { | |
| ^^^^^^^^^^^ | |
| error: 4: unknown identifier 'sk_FragColor' | |
| sk_FragColor = half4(sk_Clockwise ? +1 : -1); | |
| ^^^^^^^^^^^^ | |
| error: 4: unknown identifier 'sk_Clockwise' | |
| sk_FragColor = half4(sk_Clockwise ? +1 : -1); | |
| ^^^^^^^^^^^^ | |
| 3 errors |