How to draw to a surface with a platform-specific GPU API?

[nicoburns]

The README mentions that surfman allows one to:

draw to a surface with a platform-specific GPU API like Metal

This sounds like it could be really useful to bridge the gap between libraries using OpenGL and libraries using WGPU. But I don't actually see any reference to APIs other than OpenGL in the docs. So my questions are:

• Is this actually possible?
• If so, how would one do it?

[jdm]

I'm not aware of any examples of this, but I believe it would work like this (using macOS with Metal as an example):

1. create a generic surface
2. obtain the native surface for the new surface
3. create a new Metal texture that uses the iosurface as a backing store
4. possibly ensure that synchronization occurs?