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Cascaded Shadow maps not quite right

opengl,shadow-mapping
Ok. So, I've been messing around with shadows in my game engine for the last week. I've mostly implemented cascading shadow maps (CSM), but I'm having a bit of a problem with shadowing that I just can't seem to solve. The only light in this scene is a directional light...

Shadow Map Positioning and Resolution

c++,opengl,3d,shadow,shadow-mapping
I'm currently learning C++ and OpenGL and was wondering if anyone could walk me through what is exactly happening with the below code. It currently calculates the positioning and resolution of a shadow map within a 3D environment. The code currently works, just looking to get a grasp on things....