Test if this works on URP 12 & URP 14

[Zallist]

• Just download it and see if it works on URP 12 (2021.2 & 2021.3) and URP 14 (2022.2)

It should just work unless there's something obvious missing in the .hlsl file. Probably just the blend mode preserving specular is broken, which isn't supported on Lit in URP 12 anyway.

[bmourit]

Oddly enough, I was just finishing my own work on ShaderGraph SimpleLit, and right afterward I found you published this to GitHub literally the same day. I guess we are on the same wavelength.

Difference with mine was that I am working in URP 12. I can confirm that the preserve specularity is what prevents yours from working on URP 12. When I get the time I will create a pull request.

I also provide a legacy upgrade path for mine, along with the SimpleLitGBuffer.hlsl for forward rendering path.

I initially used a separate namespace to prevent any conflicts with URP. That may be something worth considering for safety reasons. For the SimpleLitGBuffer a ran into a problem with SurfaceDescriptors to SurfaceData for the function that Unity provides. Maybe I will create a new method all together to convert this, similar to how BRDF has done.

I also stripped out the WorkflowMode functionality, since we work only with specular and it cleaned up the code a bit.

[Zallist]

Isn't time weird.

• I'll close this issue and make a new one to get it working on URP 12, for sanity, since this confirms it.
• I purposely kept the same namespace so that this was an exact in-place SimpleLit. So that if/when Unity DOES implement it themselves, it errors. If/when Unity implements this natively, nobody should be using this Shim, and the namespace conflicts & class conflicts should cause a compilation error they can fix at that time, rather than having people scratch their heads and forgetting their using a custom Simple Lit. In the scenario that someone wants to keep this after Unity officially supports it, they can fork it and rename it. Since I'll have stopped supporting it the second Unity officially does.
• I kept all the existing code, but commented out, so that it was easy to tell exactly what changes were made. My idea being that when URP 14+ release, it should be a simple Diff between this Simple Lit and the newer Lit to see what was added/removed, and make the relevant changes, if applicable. If I strip out code completely, then it makes the job of keeping this up to date with URP more difficult.