Need help with FinishRendering call

Development Rendering
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1

Hello UE4 community,

I have been wrestling with an issue for a while (looking at other custom display plugins etc) and not getting anywhere.

I have a custom FCurrentCustomPresent object. It works, but I want to add functionality that updates the state of a texture buffer after a copy to it is complete. Here is the sample pseudo-code:

// My custom present object

class FCurrentCustomPresent : public FDolbyCustomPresent<ID3D11Device>
{
public:
	...
	...
	UpdateState();
	...
}

void FCurrentCustomPresent::UpdateState()
{
	// Update CPU buffer state variable
	myBufferState = BUFFER_IS_SENT;
}

void FCurrentCustomPresent::FinishRendering()
{
	...
	...
	ID3D11Texture2D* myTexture = MyFunctionToGetTexture();
	ID3D11Texture2D* inputTexture = (ID3D11Texture2D*)mRenderTexture->GetNativeResource();
	
	ENQUEUE_UNIQUE_RENDER_COMMAND_THREEPARAMETER(
		void,
		ID3D11Texture2D*, tt, myTexture,
		ID3D11Texture2D*, bt, inputTexture,
		FCurrentCustomPresent*, This, this,
		{
			GetD3D11ImmediateContext()->CopyResource(tt, bt);
			GetD3D11ImmediateContext()->Flush();
			This->UpdateState();
		}
	);
}

The problem is - that UpdateState() function is not being called. In my “working” implementation so far, I call the UpdateState() function asynchronously, right after the ENQUEUE_ … call and I occasionally see the wrong texture show up at output. Would really appreciate any help or pointers to solve this problem.

Thanks much!

2

Hello again!

So I was able to “fiddle” with the code and make it work. Posting here so it helps out someone.

All I had to do in the code block (in question) was to give the ENQUEUE … function a name (any name)! I don’t know why it is so - maybe somebody can dig into engine code and find out (UE4.19)

Cheers,

// My custom present object
 
 class FCurrentCustomPresent : public FDolbyCustomPresent<ID3D11Device>
 {
 public:
     ...
     ...
     UpdateState();
     ...
 }
 
 void FCurrentCustomPresent::UpdateState()
 {
     // Update CPU buffer state variable
     myBufferState = BUFFER_IS_SENT;
 }
 
 void FCurrentCustomPresent::FinishRendering()
 {
     ...
     ...
     ID3D11Texture2D* myTexture = MyFunctionToGetTexture();
     ID3D11Texture2D* inputTexture = (ID3D11Texture2D*)mRenderTexture->GetNativeResource();
     
     ENQUEUE_UNIQUE_RENDER_COMMAND_THREEPARAMETER(
         JustGiveMeAnyName,
         ID3D11Texture2D*, tt, myTexture,
         ID3D11Texture2D*, bt, inputTexture,
         FCurrentCustomPresent*, This, this,
         {
             GetD3D11ImmediateContext()->CopyResource(tt, bt);
             GetD3D11ImmediateContext()->Flush();
             This->UpdateState();
         }
     );
 }