State package:GLUT

GLUT maintains a considerable amount of programmer visible state. Some (but not all) of this state may be directly retrieved.

The current state of a key or button

The window state of the current window

A window state callback

Controls the window state callback for the current window. The window state callback for a window is called when the window state of a window changes. If the window state callback for a window is disabled and later re-enabled, the window state state of the window is undefined; any change in the window state will be reported, that is if you disable a window state callback and re-enable the callback, you are guaranteed the next window state change will be reported. Note that you can either use visibilityCallback or windowStateCallback, but not both, because the former is implemented via the latter.

(freeglut only) Contains True if GLUT has been initialized with initialize or getArgsAndInitialize has and not yet been de-initialized with exit. Contains False otherwise.