@Override
    public int getButtonCount() {
        return GLFW_MOUSE_BUTTON_LAST + 1;
    }
Check if the input is initialized.
@return <code>true</code> if the input is initialized and <code>false</code> otherwise.
jme3-vr/src/main/java/com/jme3/input/lwjgl/GlfwMouseInputVR.java