Question URP Scriptable Render Feature Blit with Custom Shader not working in VR (Mutliview)

Cross posting this as I really need it solved - original post here

I am working in Unity 2019.4.11f1 and have written a Scriptable Render Feature for my project which is using Universal RP 7.3.1.

The process works completely fine on PC in Editor but has proven troublesome on Oculus Quest 2.

For VR I am using the Oculus XR Plugin 1.4.3.

In my post process I am using a Command Buffer to Blit one texture into another using a custom Shader/Material.

My textures for VR are being set up in a standard way using

Code (CSharp):

1. var texID = Shader.PropertyToID("_textureID");
2. var renderTextureDescriptor = XRSettings.eyeTextureDesc;            
3. commandBuffer.GetTemporaryRT(texID , renderTextureDescriptor, FilterMode.Bilinear);

Performing a ping/pong process I am simply doing

Code (CSharp):

1. commandBuffer.Blit(ping, pong, customMaterial, 0);
2. commandBuffer.Blit(pong, ping, customMaterial, 1);

Using Render Doc and debugging a frame on my Quest I can see my Blit process is not setting any of the textures for the material. The textures are being set to default/white instead. https://imgur.com/a/MHw5Ht9

I've tried explicitly setting these textures using CommandBuffer.SetGlobalTexture

Code (CSharp):

1. commandBuffer.SetGlobalTexture ("_MainTex", ping);

But nothing seems to work.

Completely out of ideas on this one, anyone come across this before? I'm not sure what needs to be done to get my textures linked to my Shader.

 

Hi Thomas,

That makes sense, thank you for your response!

I've not actually ported the shader from a CGPROGRAM to a HLSLPROGRAM. Looking at examples for the TEXTURE2D_X macro the shader will need to be ported to support it correct?

I'll give that a go now!

Thanks,
Dan

 

Hi Thomas,

I just ported over my Shaders to HLSL and set up my Texture/Samplers like so.

Code (CSharp):

1. TEXTURE2D_X (_MainTex);
2. SAMPLER(sampler_MainTex);
3. CBUFFER_START(UnityPerMaterial)
4.   float4 _MainTex_ST;
5. CBUFFER_END

This is all working as expected in Editor but when I build to my Quest it doesn't work.

Looking at a RenderDoc capture it appears to be the same issue, my _MainTex is defaulted to UnityWhite.

This is the same even if I use

Code (CSharp):

1. commandBuffer.SetGlobalTexture ("_MainTex", _RenderTexID);