Can someone please explain how the VR APIs fit into things

Man of Honour
Man of Honour
Joined
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Here's a question for the more knowledgeable amongst us.

If I'm using a game via a monitor, my understanding is that:
- The game talks to the graphics API (e.g. Nvidia drivers)
- The drivers talk to DX11, as hosted by windows
- The DX11 talks to my graphics card and then outputs a display

If I then introduce say an Oculus VR solution, there's an additional logical component added. What talks to that? Is it the game > Oculus > Nvidia drivers > DX11 > graphics card?

I was curious about the above, why Oculus don't support SLI, whether Vulkan might help and so on.
 
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