Feature Request Shader Model 5.0 functions don't work

I'd like to port a shader which uses some DX11 functions, such as GatherRed, GatherGreen, CalculateLevelOfDetail, and RWTexture2D.

Example code is below (I'm using a File for the custom function):

Code (CSharp):

1. void GatherRed_float(Texture2D Texture, float2 UV, SamplerState Sampler, out float4 Out)
2. {
3.     Out = Texture.GatherRed(Sampler, UV);
4. }

However using a custom node gives me the following error. I assume this is because the instructions require shader model 4. I'm guessing ShaderGraph defaults to #pragma target 4.0.

Is there a way to make this work with ShaderGraph? Eg forcing the Shader or custom node to require a higher shader model than 4? 4 seems like a pretty low target considering the modern platforms that HDRP targets, so I really hope this is possible or at least planned for the near future, as it prevents a lot of advanced techniques from being implemented in ShaderGRaph.

 

Weirdly enough, the compiled shader code for a HDRP shader does have #pragma target 4.5 specified, which should be able to support the instructions. (If I make a custom shader with the same target and instructions, it compiles fine)

So it seems like ShaderGraph just won't accept custom functions that require #pragma target 4.5, even though that's what the final shader is compiled to?

This is a bit strange, and also hard to find any documentation on.