Driver Documentation

Let's say you want to write a new OpenVR driver called "myhmd". To do that you will need to following the steps below.

1. Add a new directory called "/SteamApps/common/openvr/drivers/myhmd"
2. Add a new DLL (or dylib or so) to "drivers/myhmd/bin/win32/driver_myhmd.dll"
3. Implement the driver factory function in that DLL.
4. Add an implementation of (vr::IClientTrackedDeviceProvider)[https://github.com/ValveSoftware/openvr/wiki/IClientTrackedDeviceProvider_Overview] to the DLL and return it from the factory. This interface is used in vrclient.dll for HMD presence checks and various other client-side operations.
5. Add an implementation of (vr::IServerTrackedDeviceProvider)[https://github.com/ValveSoftware/openvr/wiki/IServerTrackedDeviceProvider_Overview] and have that return implementations of vr::ITrackedDeviceServerDriver for each tracked device.

If you want your new driver to work from 64 bit apps, you will also need a 64-bit DLL in "drivers/myhmd/bin/win64/driver_myhmd.dll" that implements all the same things. Same thing for other platforms.