Add some gaming related stuff

flake.nix

@@ -28,6 +28,7 @@
           ./roles/remote.nix
           ./roles/plasma.nix
           ./fragments/hardware/nvidia-modeset.nix
+          ./roles/gaming.nix
         ];
       };
     };

roles/gaming.nix

@@ -0,0 +1,28 @@
+{ config, lib, pkgs, ...}:
+{
+  # oopsies this is for home-manager
+  # programs.mangohud.enable = lib.mkDefault true;
+
+  programs.steam = {
+    enable = lib.mkDefault true;
+    gamescopeSession = {
+      enable = lib.mkDefault true;
+    };
+  };
+
+  programs.gamemode = {
+    enable = lib.mkDefault true;
+    enableRenice = lib.mkDefault true;
+  };
+
+  programs.gamescope = {
+    enable = lib.mkDefault true;
+    capSysNice = lib.mkDefault false;
+  };
+
+  environment.systemPackages = with pkgs; [
+    mangohud
+    goverlay
+    prismlauncher
+  ];
+}

roles/plasma.nix

@@ -7,4 +7,9 @@
 
   services.xserver.displayManager.sddm.enable = true;
   services.xserver.desktopManager.plasma5.enable = true;
+
+  environment.systemPackages = with pkgs; [
+    # this fixes tiny file dialogs for Minecraft
+    libsForQt5.kdialog
+  ];
 }