There is some interest from LunarG to reimplement OpenGL in Mesa on top of Vulcan eventually. So yes. Its the same way Gallium3d can implement Direct3d and Open

There is some interest from LunarG to reimplement OpenGL in Mesa on top of Vulcan eventually. So yes. Its the same way Gallium3d can implement Direct3d and OpenGL against one intermediary representation (TSGI) and backend hardware interface (winsys).