Huh.

Ages ago, I tried to figure out how to dynamically probe OpenGL extensions. My intent was that the first time a method call was attempted, the method proxy would

  look for a concrete implementation

  on success, swap its pointer to the concrete implementation

  on fail (not found), swap its pointer for a generic error method

  then call itself again

By doing it dynamically, an app would only be probing extensions it actually used, versus every extension from every vendor. Back then, all the stubs were code generated. To avoid probing everything, we'd manually modify the headers, which I didn't like maintaining.

I didn't get very far. Looking at your implementation reminded me of that effort.

I haven't done OpenGL in probably 15 years. I don't even know if extension probing is still a thing (useful).

Thanks for sharing.