Are the logic and the rendering loop in separate threads?
If so, how do you ensure that when the rendering loop reads the shared state, it sees something consistent (i.e. something that hasn't been updated by the logic loop in between the time when the rendering loop started accessing it, and the time when the rendering loop finished accessing it)?
If so, how do you ensure that when the rendering loop reads the shared state, it sees something consistent (i.e. something that hasn't been updated by the logic loop in between the time when the rendering loop started accessing it, and the time when the rendering loop finished accessing it)?