1### Compilation failed: 2 3error: 3: invalid type 4layout(binding=0) sampler2D s; 5^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 6error: 5: 'main' must return: 'vec4', 'float4', or 'half4' 7void main() { 8^^^^^^^^^^^ 9error: 6: unknown identifier 'sample' 10 float4 a = sample(s, float2(0)); 11 ^^^^^^ 12error: 6: unknown identifier 's' 13 float4 a = sample(s, float2(0)); 14 ^ 15error: 7: unknown identifier 'sample' 16 float4 b = sample(s, float3(0)); 17 ^^^^^^ 18error: 7: unknown identifier 's' 19 float4 b = sample(s, float3(0)); 20 ^ 21error: 8: unknown identifier 'sk_FragColor' 22 sk_FragColor = half4(half2(a.xy), half2(b.xy)); 23 ^^^^^^^^^^^^ 24error: 8: unknown identifier 'a' 25 sk_FragColor = half4(half2(a.xy), half2(b.xy)); 26 ^ 27error: 8: unknown identifier 'b' 28 sk_FragColor = half4(half2(a.xy), half2(b.xy)); 29 ^ 309 errors 31