LV2 OpenGL UIs on Windows

I have been working on Suil support for wrapping native Windows plugin UIs in Gtk. Here is a plugin with a Pugl UI embedded in the Gtk version of Jalv:

Very fresh work, but the basics (display, and mouse/keyboard input) are working well. This work is not actually OpenGL specific, any native Windows UI will work equally well. Apologies for the boring screenshot, this is just my test GL plugin that does nothing. However, it is a working example of a plugin with a portable custom UI; hopefully we'll soon see production plugins with UIs that work equally well across toolkits and platforms.