Is there something like OpenGL overlay spec?

I wonder there is some document to regulate the implementation of opengl overlay? just like extension spec.

I only find a overlay example at Nate Robins’ site. Many thanks!

I could find nothing as detailed as a spec.
Anyway, those links can help :

And some bits talking about “overlay” and “layer” here, but nothing detailed :

Personally, I always stayed away from this “overlay” thingy :slight_smile:

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