Getting a hardware pointer/handle to a texture

Development Rendering
1

I’m trying to get the hardware pointer/handle to a texture.

This is possible in Unity using (Texture.GetNativeTexturePtr)

How is this done with Unreal?

2

Hi Hmb3141, Unreal Engine wraps the hardware differences under the RHI; if you provide some info on what you want to accomplish, it’d be easier to give you a workaround.

Roughly, UTexture holds an FRHITexture, which can be cast to an FD3D11Texture2D for example, which holds the D3D handle.

3

I’m trying to implement Spout under windows and Syphon under OSX. Both of which are frameworks which allow realtime video sharing between applications.

In the short term I would just like to just get this working, at the minute I’m focusing on Spout for windows. I’ve built the Spout SDK into a lib and linked it to Unreal. In Spout I’m creating a D3D11 Texture, which I need to do a blit to from an Unreal Texture. To do this I need to pass the Texture Handle to Spout.

Currently I’m using a ScreenCapture2D with a Render Texture to access a Utexture2D, although perhaps there’s a more efficient method for this.

In the long term I’d like to create an Unreal Plugin. If a workaround would require a change in engine code, do you think it’s the sort of change that is likely to be added if a pull request was made?

Thanks,

Harvey

4

Hi,

Could you expand on how you can get access the D3D handle.

I’ve been attempting to get access to the ID3DTexture like so, where cameraTarget is a UTextureRenderTarget2D. This compiles fine, but crashes when it’s run.


		if (cameraTarget != NULL) {
			if (cameraTarget->TextureReference.IsInitialized()) {
				UE_LOG(LogTemp, Warning, TEXT("cameraTarget - TextureReference.IsInitialized()"));
				FTextureReference fTexRef = cameraTarget->TextureReference;
				FTextureReferenceRHIRef fTextRefRHIref = fTexRef.TextureReferenceRHI;
				FRHITextureReference *frhiTexRef = fTextRefRHIref.GetReference();
				FRHITexture *frhiTex = frhiTexRef->GetReferencedTexture();
				ID3D11Texture2D *d3d11Tex = (ID3D11Texture2D*) frhiTex->GetNativeResource();
			}
		}

I also get a crash with just fTextRef = cameraTarget->Texture.

Thanks

5

Did you ever get a chance to look at this?

1 Like
7

Hello,

I have tested the spout plugin for Ue4 and it inputs correctly the video fee. However for the project I am working on, I need to send a video (from touch designer) , through spout and import that as a texture and material in UE4. Any developments on that front. Or can you guide me to someone who potentially is interested in a gig to resolve this issue.

8

This sounds like something I need as well. I have an application that is rendering video to a FD3D11Texture2D. I would like to use this memory buffer as a texture source, so the video can be mapped to an unreal material and displayed in my unreal application. I have been successful in implementing a shared memory interface, permitting data to be shared between several applications (including unreal) simultaneously. Have you made any