Here's how 2D coordinates usually are for other programs/languages/whatever
^<-- top left over there is (0,0)
Bottom right over there -->v is something around (640,480), depending on window size
This is a good system and easy to work with
^<-- top left is (-1, -1)
Middle is (0,0)
Bottom right -->v is (1, 1)
..This is annoying.
How do I change it to the first system?