Most game engines work with some kind of abstraction to unify access to the underlying graphics APIs such as D3D, DX12, OpenGL, Vulkan and Metal (for example in Unity there's GraphicsDevice). Does anyone know if there's any work being done to create an open source abstraction like that? It would be neat if it were possible for open source games and game engines to share the work being done to ease cross-platform development.
I believe bfgx[0] is similar to what you're describing. It's been around since before the Vulkan/DX12/Metal era so the abstractions are more similar to OpenGL/DX11 where you don't have concepts like command buffers and command queues etc, which might be a turn off.
Big open source projects still seem to roll their own solution for this, which I imagine is both for historical reasons but also because there might be a fear that using a library like this could leave your hands tied when you need to do some API-specific workaround.