Intel and XMir

A more unified driver interface is what you get, when all this is done (10+ years?). Wayland does not have device specific drivers. Instead you need a kernel drm driver and some user space part in mesa (or your own GL implementation).

I think there is some tiny integration needed between Wayland and mesa(or similar) for EGL to work (and similar Mir). But EGL is just another windowing API instead of GLX, not the core parts of opengl itself. Windows has WGL, osx has CGL, EGL is supposed to be portable API.