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