c game engine

I've started writing a game engine (using openGL) in C :)

I worked on this about 8hrs now, i have figured out how to resize the viewport / keep everything intact afterwards
I currently try to get an interaction system running that works like, press button => handler get called.
idk if this is a good approach to do it, but I need some approach to get input, to create a "movement system"

I mainly have no clue how to do collision etc, but I hope i will figure it out


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