You don’t use the value directly. Instead, divide the circle up so that there are 65535 steps around the unit circle between [0, 2*pi) and use these units inste

You don’t use the value directly. Instead, divide the circle up so that there are 65535 steps around the unit circle between [0, 2*pi) and use these units instead of degrees or radians. This makes integer overflow and wrapping around the circle correspond: going a quarter way around the circle five times, adds up to 90 degrees, rather than 450.