treewide: cleanup config with enable options

system/gaming.nix

@@ -0,0 +1,63 @@
+{
+  config,
+  pkgs,
+  lib,
+  inputs,
+  ...
+}:
+{
+  options.my.gaming.enable = lib.mkEnableOption { };
+
+  config = lib.mkIf config.my.gaming.enable {
+    programs.steam.enable = true;
+    programs.steam.extraPackages =
+      config.fonts.packages
+      ++ (with pkgs; [
+        capitaine-cursors
+        bibata-cursors
+        mangohud
+        xdg-user-dirs
+        gamescope
+
+        # gamescope compatibility??
+        xorg.libXcursor
+        xorg.libXi
+        xorg.libXinerama
+        xorg.libXScrnSaver
+        libpng
+        libpulseaudio
+        libvorbis
+        stdenv.cc.cc.lib
+        libkrb5
+        keyutils
+      ]);
+
+    environment.systemPackages = with pkgs; [
+      protontricks
+      bottles
+      inputs.dzgui-nix.packages.${pkgs.system}.default
+    ];
+
+    programs.gamemode = {
+      enable = true;
+      enableRenice = true;
+      settings = {
+        general = {
+          renice = 10;
+        };
+
+        # Warning: GPU optimisations have the potential to damage hardware
+        gpu = {
+          apply_gpu_optimisations = "accept-responsibility";
+          gpu_device = 0;
+          amd_performance_level = "high";
+        };
+
+        custom = {
+          start = "${pkgs.libnotify}/bin/notify-send 'GameMode started'";
+          end = "${pkgs.libnotify}/bin/notify-send 'GameMode ended'";
+        };
+      };
+    };
+  };
+}