Making my first shader, how do I keep vanilla shadows?

I'm working on my own shader (mostly for learning) and I want to work on it bit by bit and learn as I think of things. Right now I've simply created some fog. But when my shader is active it seems I completely lose vanilla shadows? How can I get them back while using my shader? Currently my shader directory is this: shaders/ ├─ composite.fsh ├─ composite.vsh ├─ shaders.properties I guess I incorrectly assumed that anything I didn't change would just fallback to vanilla?

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Making my first shader, how do I keep vanilla shadows?

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