Simple window size script

///Handle window size.

//If the window is not set to fullscreen.
if (global.windowsize != 3) {

    //Set up the size of the window.
    window_set_size(256*global.windowsize, 244*global.windowsize);

    //Center the window if it's not centered.
    window_center();

    //Disable fullscreen.
    window_set_fullscreen(false);
}

//Otherwise, if set to fullscreen.
else {

    //Set window to fullscreen.
    window_set_fullscreen(true);
}