Godot 4: Snow shader (tutorial)

Hey everybody! As a complement to the shaders we used to generate rain or a star field, we will create some nice snowfall. It's true that I have already programmed snow once, but that was in a 3D scene and with particles. This time, I'll use a 2D shader, but with a nice spatial effect using several layers, as you can see in the background right now. Let's get to it.