1### Compilation failed: 2 3error: 2: unknown identifier 'sk_SampleMaskIn' 4 return half4(sk_SampleMaskIn); 5 ^^^^^^^^^^^^^^^ 6error: 6: unknown identifier 'sk_SampleMask' 7 sk_SampleMask = 0; 8 ^^^^^^^^^^^^^ 9error: 10: unknown identifier 'sk_SampleMask' 10 sk_SampleMask = sk_SampleMaskIn; 11 ^^^^^^^^^^^^^ 12error: 10: unknown identifier 'sk_SampleMaskIn' 13 sk_SampleMask = sk_SampleMaskIn; 14 ^^^^^^^^^^^^^^^ 15error: 13: 'main' must return: 'vec4', 'float4', or 'half4' 16void main() { 17^^^^^^^^^^^ 18error: 16: unknown identifier 'sk_SampleMask' 19 sk_SampleMask = 0xFFFFFFFF; 20 ^^^^^^^^^^^^^ 21error: 17: unknown identifier 'sk_FragColor' 22 sk_FragColor = samplemaskin_as_color() / 256.0; 23 ^^^^^^^^^^^^ 247 errors 25