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Notes for OpenVR and Steam

WiVRn only provides an OpenXR runtime. For games that use OpenVR, xrizer or OpenComposite should be used to translate the APIs.

If using Steam, games will be sandboxed by pressure vessel, which does not passthrough OpenXR by default.

  • Files under /usr are mapped into /run/host/usr. If xrizer/OpenComposite is installed there, make sure VR_OVERRIDE or ~/.config/openvr/openvrpaths.vrpath uses /run/host/usr prefix.
  • PRESSURE_VESSEL_IMPORT_OPENXR_1_RUNTIMES=1 must be set to passthrough the WiVRn OpenXR manifest, library locations, and socket location.

By default, WiVRn attempts to automatically find xrizer and OpenComposite in a number of places:

  • When WiVRn is shipped as a flatpak, it uses a provided copy of xrizer by default.
  • WiVRn attempts to autodetect xrizer and OpenComposite in a number of places (see OVR_COMPAT_SEARCH_PATH in CMakeLists.txt).
  • The openvr-compat-path configuration may be used for an unexpected install location.

If it is found, WiVRn adjusts the openvrpaths.vrpath file, and includes whitelisting the xrizer/OpenComposite path and setting VR_OVERRIDE in the environment variables.