That's not how mouse input works though, right? If I move my mouse cursor to 10,10, and then pick up the mouse and set it down somewhere else, it's still at coordinates 10,10. You don't need the mouse's physical absolute position, but just the cursor position (which is the sum of all the relative movements)
> That's not how mouse input works though, right?
No, mouse input data does not work that way.
My reply was referring to @tehbeard's suggestion that the mouse could be modified to send absolute coordinates instead, and I was pointing out a reason why that modification would not work out so well.