The joystick whose pointer to return.
Errors: Possible errors include @ref GLFW_NOT_INITIALIZED.
This function may be called from any thread. Access is not synchronized.
@sa @ref joystick_userptr @sa @ref glfwSetJoystickUserPointer
Added in version 3.3.
Ingroup: input
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Returns the user pointer of the specified joystick.
This function returns the current value of the user-defined pointer of the specified joystick. The initial value is null.
This function may be called from the joystick callback, even for a joystick that is being disconnected.