Single-pass instanced rendering support

[Nirv-git]

I was curious if would be possible for you to add Single-pass instanced rendering support to this shader.

Some explanation is that VR applications need the image rendered in stereo. The older method is to use Multi-pass rendering, while Single-pass instanced has some more performance enhancements. This grass shader works great in the old multi-pass, just not Single-pass. It is still using the Build-in Render Pipeline, just needs some accommodations in the shader code.

With more basic shaders I have been able to go through the Unity documentation below and make the modifications myself, mostly just adding macros to the correct spots. However I am very much not a shader dev and have been finding it a challenge to make the correct changes to this one.

I'd be happy to toss you a tip/ko-fi for your efforts.

Some documents on applying these changes to custom shaders
https://docs.unity3d.com/Manual/SinglePassInstancing.html
https://github.com/cnlohr/shadertrixx/tree/main?tab=readme-ov-file#add-instancing-support
https://github.com/cnlohr/shadertrixx/tree/main?tab=readme-ov-file#tessellation-shader-examples

More about Stereo rendering and how to test with MockHMD https://docs.unity3d.com/Manual/SinglePassStereoRendering.html

How the shader currently looks in Single-pass instanced, it is correct in the main eye (left) but not the right

[Velorexe]

Interesting, I'll take a look at it! Can't guarantee that I can come with results, since I'm not a shader dev myself either XD
I'll let you know once I've made some progress or if I have some findings on the matter.