Is your feature request related to a problem? Please describe.
Not related to an issue - I see that in newer versions of iris and oculus, there is a builtin system to detect a biome. I'm hoping to see that biome detection system backported to 1.16.5.

Reason being is that the newer shader packs are using this system more and more and it's breaking certain functionality of these in 1.16.5. For example, puddles in newer shader packs are starting to use those built-in biome methods to detect whether or not to produce puddles or certain ground effects.

In order for that code to continue to function as intended, it needs to be able to recognize the values being called in the shader pack.

Additionally, it appears that the 1.16 version of Optifine has this functionality, so it becomes a major deficiency when dealing with oculus in those circumstances, as optifine renders those effects as intended.

Describe the solution you'd like
The biome detection code backported to the 1.16.5 version of oculus to keep it competitive with optifine.

Describe alternatives you've considered
The only alternative is to use optifine or accept some broken features of newer shaders.

Additional context
None, just keeping my fingers crossed that itll happen!