### Compilation failed:

error: 1: invalid type
layout(binding=0) sampler2D t;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: 2: 'main' must return: 'vec4', 'float4', or 'half4'
void main()
^^^^^^^^^^^
error: 4: unknown identifier 'sample'
    half4 c = sample(t, half2(0));
              ^^^^^^
error: 4: unknown identifier 't'
    half4 c = sample(t, half2(0));
                     ^
error: 5: unknown identifier 'sk_FragColor'
    sk_FragColor = c * sample(t, half3(1));
    ^^^^^^^^^^^^
error: 5: unknown identifier 'c'
    sk_FragColor = c * sample(t, half3(1));
                   ^
error: 5: unknown identifier 'sample'
    sk_FragColor = c * sample(t, half3(1));
                       ^^^^^^
error: 5: unknown identifier 't'
    sk_FragColor = c * sample(t, half3(1));
                              ^
8 errors