Cascaded shadow maps

[FacoBackup]

• Update every N frames (configurable)
• For foliage, allow enabling or disabling shadow maps
• Render shadows only for visible foliage

https://learnopengl.com/Guest-Articles/2021/CSM
https://www.youtube.com/watch?v=u0pk1LyLKYQ&ab_channel=WesleyLaFerriere

https://github.com/GKR/NvidiaCascadedShadowMapsGLM/blob/master/src/GLSL/shadow_multi_leak_fragment.glsl
https://github.com/ivanigle/Cascaded-Shadow-Maps/blob/master/CS562/src/shadow_map.cpp