It seems that dispatch need to take two arguments. May I know What should I write in the 2nd argument?

[john012343210]

// Dispatches this shader. Can be called from any thread
static void Dispatch(
FnameOfTheShader9DispatchParams Params,
TFunction<void(int OutputVal)> AsyncCallback
)
{
if (IsInRenderingThread()) {
DispatchRenderThread(GetImmediateCommandList_ForRenderCommand(), Params, AsyncCallback);
}else{
DispatchGameThread(Params, AsyncCallback);
}
}

// Params struct used to pass args to our compute shader
FnameOfTheShader9DispatchParams Params(1, 1, 1);

// Fill in your input parameters here
Params.X = 123;

// Executes the compute shader and blocks until complete. You can place outputs in the params struct
FnameOfTheShader9Interface::Dispatch(Params);

It seems that dispatch need to take two arguments. May I know What should I write in the 2nd argument?

[AskingQuestions]

That would be a callback function:

FnameOfTheShader9Interface::Dispatch(Params, [](int OutputVal) {
  // Do something
});

The callback is run when the results are back from the gpu

[john012343210]

@AskingQuestions

May I have your kind help for some guidance?

https://unreal.shadeup.dev/docs/compute/base
I'm following this example, which just sum up the two numbers.

May I know in order to get the result Should I use the callback function?

[AskingQuestions]

May I know in order to get the result Should I use the callback function?

Correct, that callback function will be called with the resulting data in the buffer from the GPU.