### Compilation failed:

error: 1: 'main' must return: 'vec4', 'float4', or 'half4'
void main() {
^^^^^^^^^^^
error: 7: unknown identifier 'sk_FragColor'
    sk_FragColor = half4(half(array[x]), half(array[y]), half(array[z]), half(array[w]));
    ^^^^^^^^^^^^
2 errors