### Compilation failed:

error: 1: type 'texture2D' does not support qualifier 'readonly'
layout(binding=0, rgba32f) readonly texture2D t;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: 1: invalid type
layout(binding=0, rgba32f) readonly texture2D t;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: 2: 'main' must return: 'vec4', 'float4', or 'half4'
void main()
^^^^^^^^^^^
error: 4: unknown identifier 'textureSize'
    uint2 dims = textureSize(t);
                 ^^^^^^^^^^^
error: 4: unknown identifier 't'
    uint2 dims = textureSize(t);
                             ^
error: 5: unknown identifier 'sk_FragColor'
    sk_FragColor = half4(dims, dims);
    ^^^^^^^^^^^^
error: 5: unknown identifier 'dims'
    sk_FragColor = half4(dims, dims);
                         ^^^^
error: 5: unknown identifier 'dims'
    sk_FragColor = half4(dims, dims);
                               ^^^^
8 errors