add: gamescope steam and fonts

nixos/gaming/steam/default.nix

@@ -1,11 +1,33 @@
-{ pkgs, ... }:
+{
+  config,
+  pkgs,
+  ...
+}:
 
 {
   programs.steam = {
     enable = true;
+    remotePlay.openFirewall = true;
+    dedicatedServer.openFirewall = true;
+    extest.enable = true;
+    protontricks.enable = true;
     extraCompatPackages = with pkgs; [
       proton-ge-bin
     ];
+
+    gamescopeSession = {
+      enable = true;
+      env = {
+        STEAM_ALREADY_GAMESCOPED = "1";
+        SDL_VIDEO_MINIMIZE_ON_FOCUS_LOSS = "0";
+        WINE_MOUSE_WARP_OVERRIDE = "force";
+      };
+      args = [
+        "--fullscreen"
+        "--force-grab-cursor"
+      ];
+    };
+
     package = pkgs.steam.override {
       extraEnv = {
         STEAM_USE_PORTAL = "1";
@@ -47,11 +69,30 @@
           pkgsi686Linux.libpulseaudio
         ];
     };
-    gamescopeSession.enable = true;
+  };
+
+  programs.gamescope = {
+    enable = true;
+    capSysNice = true;
   };
   programs.bash.enable = true;
   hardware.graphics.enable = true;
-  environment.systemPackages = with pkgs; [
-    protontricks
+  hardware.steam-hardware.enable = true;
+  environment.systemPackages = [
+    (pkgs.lib.hiPrio (
+      pkgs.writeShellScriptBin "steam" ''
+        REAL_STEAM="${config.programs.steam.package}/bin/steam"
+
+        if [ -n "$STEAM_ALREADY_GAMESCOPED" ] || [ -n "$GAMESCOPE_WAYLAND_DISPLAY" ]; then
+          exec "$REAL_STEAM" "$@"
+        fi
+
+        if [ "$STEAM_USE_GAMESCOPE" = "1" ] && command -v steam-gamescope >/dev/null 2>&1; then
+          exec steam-gamescope "$@"
+        fi
+
+        exec "$REAL_STEAM" "$@"
+      ''
+    ))
   ];
 }