Returns whether the specified joystick has a gamepad mapping.
This function returns whether the specified joystick is both present and has a gamepad mapping.
If the specified joystick is present but does not have a gamepad mapping
this function will return
GLFW_FALSE but will not generate an error. Call
glfwJoystickPresent to check if a
joystick is present regardless of
whether it has a mapping.
GLFW_TRUEif a joystick is both present and has a gamepad mapping, or