gamescope session related tweaks

systems/x86_64-linux/drivebystation-nix/default.nix

@@ -88,6 +88,15 @@ in
       # networking.firewall.enable = false;
       programs.steam.gamescopeSession.enable = true;
       programs.gamescope.enable = true;
+      programs.steam.gamescopeSession = {
+        enable = true;
+        args = [
+          "-w" "1920"
+          "-h" "1080"
+          "-r" "172"
+
+        ];
+      };
 
       # Install firefox.
       programs.firefox.enable = true;
@@ -102,9 +111,22 @@ in
         ntfs3g 
         ntfsprogs
         synergy
+        mangohud
         my-namespace.udev-steelseries
         my-namespace.hello
         kde-rounded-corners
+        (pkgs.writeShellScriptBin "switch-to-desktop" ''
+          #!/bin/sh
+          # Kill Steam and return to display manager
+          pkill steam || true
+          pkill gamescope || true
+          # End the session cleanly
+          loginctl terminate-session "$XDG_SESSION_ID"
+        '')
+        (pkgs.writeShellScriptBin "steamos-session-select" ''
+          #!/bin/sh
+          exec switch-to-desktop
+        '')
         # stuff I installed to try to get gamescope to work to no avail Gamescope is just broken it seems.
           # pkgs.mesa
           # pkgs.vulkan-loader