run method
Returns linear RGBA for attachment zero. Null discards the fragment.
Implementation
@override
Vector4? run(Float32List v, ShaderBindings b, FragmentContext c) {
c.surface = Vector4(0.75, 0.5, 0.25, 1.0);
return Vector4(0.25, 0.5, 0.75, 1.0);
}