Refactor modules style

nixosModules/services/graphics/nvidia/default.nix

@@ -0,0 +1,28 @@
+{ config, pkgs, lib, ... }:
+
+{
+  options = {
+    nvidia.enable = lib.mkEnableOption
+      "Enables nvidia with proprietary drivers";
+  };
+
+  config = lib.mkIf config.nvidia.enable {
+    # Enable OpenGL
+    hardware.opengl = {
+      enable = true;
+      driSupport = true;
+      driSupport32Bit = true;
+    };
+
+    services.xserver.videoDrivers = ["nvidia"];
+
+    hardware.nvidia = {
+      modesetting.enable = true;
+      package = config.boot.kernelPackages.nvidiaPackages.stable;
+    };
+
+    environment.systemPackages = with pkgs; [
+      nvidia-vaapi-driver
+    ];
+  };
+}