I have a question. Are there any free, open source shaders out there, that support typical game engine graphics, From unity or Godot?
The features I am looking for are:
shadow mapping, reflections, light falloff, normals, etc…
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Haha, this might not be the best place to ask. But I’m sure you can find something decent (and for free) in their asset store:
https://assetstore.unity.com/vfx/shaders?category=vfx%2Fshaders&free=true&orderBy=0
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OK. I was just wondering if there was anyone that had the source code for something like that.
I have researched it (shadow mapping) and pretty much everyone said that it just had to be made from scratch, and that it was also very complicated to create a shader like that. 
While shaders seem kind of like a dark art (at least to me), I don’t think it’s as hard as you might think. Most shader-people I’ve met were able to pickup a book or learn from online tutorials. It’s not a walk in the park, but it’s also not rocket science. For starters, you could try out a coupe intro-to-shader tutorials, or just keep googling around haha.
Ray Wenderlich has some good tuts:
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