refactor: steam (#217)

hosts/idols-ai/gaming.nix

@@ -0,0 +1,58 @@
+{ pkgs, nix-gaming, ... }:
+{
+  # https://wiki.archlinux.org/title/steam
+  # Games installed by Steam works fine on NixOS, no other configuration needed.
+  programs.steam = {
+    # Some location that should be persistent:
+    #   ~/.local/share/Steam - The default Steam install location
+    #   ~/.local/share/Steam/steamapps/common - The default Game install location
+    #   ~/.steam/root        - A symlink to ~/.local/share/Steam
+    #   ~/.steam             - Some Symlinks & user info
+    enable = pkgs.stdenv.isx86_64;
+    # https://github.com/ValveSoftware/gamescope
+    # Run a GameScope driven Steam session from your display-manager
+    # fix resolution upscaling and stretched aspect ratios
+    gamescopeSession.enable = true;
+    # https://github.com/Winetricks/winetricks
+    # Whether to enable protontricks, a simple wrapper for running Winetricks commands for Proton-enabled games.
+    protontricks.enable = true;
+    # Whether to enable Load the extest library into Steam, to translate X11 input events to uinput events (e.g. for using Steam Input on Wayland) .
+    extest.enable = true;
+    fontPackages = [
+      pkgs.wqy_zenhei # Need by steam for Chinese
+    ];
+  };
+
+  # see https://github.com/fufexan/nix-gaming/#pipewire-low-latency
+  services.pipewire.lowLatency.enable = true;
+  programs.steam.platformOptimizations.enable = true;
+  imports = with nix-gaming.nixosModules; [
+    pipewireLowLatency
+    platformOptimizations
+  ];
+
+  # ==========================================================================
+  # Other Optimizations
+  # Usage:
+  #  Lutris - enable advanced options, go to the System options -> Command prefix, add: `mangohud`
+  #  Steam  - add this as a launch option: `mangohud %command%` / `gamemoderun %command%`
+  # ==========================================================================
+
+  environment.systemPackages = with pkgs; [
+    # https://github.com/flightlessmango/MangoHud
+    # a simple overlay program for monitoring FPS, temperature, CPU and GPU load, and more.
+    mangohud
+    # a GUI game launcher for Steam/GoG/Epic
+    lutris
+  ];
+
+  # Optimise Linux system performance on demand
+  # https://github.com/FeralInteractive/GameMode
+  # https://wiki.archlinux.org/title/Gamemode
+  #
+  # Usage:
+  #   1. For games/launchers which integrate GameMode support:
+  #      https://github.com/FeralInteractive/GameMode#apps-with-gamemode-integration
+  #      simply running the game will automatically activate GameMode.
+  programs.gamemode.enable = pkgs.stdenv.isx86_64;
+}