GLFW_TRUE if a joystick is both present and has a gamepad mapping, or GLFW_FALSE otherwise.
Errors: Possible errors include @ref GLFW_NOT_INITIALIZED and @ref GLFW_INVALID_ENUM.
This function must only be called from the main thread.
@sa @ref gamepad @sa @ref glfwGetGamepadState
Added in version 3.3.
Ingroup: input
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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 @ref glfwJoystickPresent to check if a joystick is present regardless of whether it has a mapping.