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----
-title: VR + NixOS + Nvidia
----
-
-## ⚠️ Note
-
-This post is quite outdated now.
-The 'prerequisites' section is still quite accurate, as you still need the proprietary drivers, however setting WiVRn
-up is significantly easier. I recommend looking at the [Linux VR Adventures Wiki](https://lvra.gitlab.io/docs/distros/nixos/)
-for a much better guide.
-
-## Introduction
-
-For the longest time, getting VR working nicely with Linux (and especially NixOS) was a monumental task.
-Nowadays however, it is easier than ever: only requiring a handful of lines of Nix!
-
-## Prerequisites
-
-In this blog post, I will be focusing on getting VR working with Steam games, using an Oculus Quest 2 headset.
-Ensure you have the proprietary Nvidia drivers installed, as this will most likely not work without them.
-You will also need Home Manager setup, as we will be utilising that to get Steam games working.
-
-```nix
-# Generic drivers, good to have
-hardware.graphics = {
-  enable = true;
-  enable32Bit = true;
-};
-
-# Nvidia specific
-hardware.nvidia = {
-  modesetting.enable = true;
-  open = true;
-};
-
-services.xserver.videoDrivers = ["nvidia"];
-```
-
-## Installing WiVRn
-
-As I am using a Quest 2, I am going to use an application called WiVRn, which will allow me to stream both wired _or_ wirelessly.
-If you are using a tethered headset such as a HTC Vive or Valve Index, I can recommend you look into [Monado](https://gitlab.freedesktop.org/monado/monado).
-WiVRn is actually based on Monado, so gertting it up and running should be fairly similar.
-All we need to get WiVRn installed is put the following in our configuration!
-
-```nix
-/* configuration.nix */
-services.wivrn = {
-  enable = true;
-  openFirewall = true; # Required for wireless streaming
-  defaultRuntime = true;
-};
-```
-
-Although we don't _necessarily_ need anything else now, installing some quality-of-life tools will definitely benefit us.
-
-```nix
-/* configuration.nix */
-environment.systemPackages = with pkgs; [
-  wlx-overlay-s # In-VR overlay
-  android-tools # Allows for wired WiVRn
-];
-```
-
-## Getting Steam games working
-
-If all we want to do is play OpenXR games, we're set!
-Most, if not all, steam games use OpenVR though, so we will need a compatibility layer: OpenComposite.
-We can tell Steam to use OpenComposite and WiVRn for games by writing a few configuration files.
-Because these files live in our home directory, we need to use Home Manager.
-In home.nix, or wherever you have your home configuration:
-
-```nix
-/* home.nix */
-xdg.configFile."openxr/1/active_runtime.json".source =
-  "${osConfig.services.wivrn.package}/share/openxr/1/openxr_wivrn.json";
-
-xdg.configFile."openvr/openvrpaths.vrpath".text = ''
-   {
-    "config" :
-    [
-      "${config.xdg.dataHome}/Steam/config"
-    ],
-    "external_drivers" : null,
-    "jsonid" : "vrpathreg",
-    "log" :
-    [
-      "${config.xdg.dataHome}/Steam/logs"
-    ],
-    "runtime" :
-    [
-      "${pkgs.opencomposite}/lib/opencomposite"
-    ],
-    "version" : 1
-  }
-'';
-```
-
-We are using `osConfig` in this case, as to use the same package we use when enabling WiVRn, meaning that if we changed `services.wivrn.package` in the future, it will use that package instead of the generic one from nixpkgs.
-
-Going back to our main configuration, we now need to tell the game to actually use these settings.
-
-We can do this by setting our game launch options to...
-```sh
-PRESSURE_VESSEL_FILESYSTEMS_RW=$XDG_RUNTIME_DIR/wivrn/comp_ipc %command%
-```
-...however, that isn't very "Nix", is it?
-To do this for _every_ game, we can override our steam package to include this environment variable.
-
-```nix
-/* configuration.nix */
-programs.steam.package = lib.mkDefault (
-  pkgs.steam.override (prev: {
-    extraEnv =
-    {
-      PRESSURE_VESSEL_FILESYSTEMS_RW = "$XDG_RUNTIME_DIR/wivrn/comp_ipc";
-    }
-    // (prev.extraEnv or {});
-  })
-);
-```
-
-Don't worry about your flatscreen games: they should just ignore this setting!
-
-## Done!
-
-We should now just be able to open the "WiVRn server" GUI application, and start gaming!
-You can read the [official WiVRn documentation](https://github.com/WiVRn/WiVRn?tab=readme-ov-file#running-1) for platform independent help on getting it up and running now, as the Nix specific stuff has now been sorted.