Gamepad : Object
Represents a gamepad/controller. Connected gamepads are available through the
The joystick positions. May also contain the direction pad (+) pressed direction.
buttons : Array<GamepadButton>
The state of the buttons on the controller.
mapping : String
'standard', the buttons/axes will follow the layout as seen at https://w3c.github.io/gamepad/#fig-visual-representation-of-a-standard-gamepad-layout.