input.go
func GamepadAxis(id int, axis int) float64 {
	return uiDriver().Input().GamepadAxis(id, axis)
}
func GamepadAxis(id int, axis int) float64 {
	return uiDriver().Input().GamepadAxis(id, axis)
}
// GamepadAxis returns the float value [-1.0 - 1.0] of the given gamepad (id)'s axis (axis).
//
// GamepadAxis is concurrent-safe.
//
// GamepadAxis always returns 0 on mobiles.