Refactor the whole configuration

Reviewed-on: #1

modules/nixos/hardware/gpu/nvidia/default.nix

@@ -0,0 +1,44 @@
+{ config, ... }:
+
+{
+  imports = [
+    ../graphics.nix
+  ];
+
+  hardware = {
+    nvidia = {
+      open = true;
+      modesetting.enable = true;
+      package = config.boot.kernelPackages.nvidiaPackages.beta;
+      nvidiaSettings = false;
+    };
+  };
+
+  boot.kernelParams = [
+    "nvidia_drm.fbdev=1"
+    "nvidia.NVreg_PreserveVideoMemoryAllocations=1"
+  ];
+
+  services.xserver.videoDrivers = [ "nvidia" ];
+
+  environment.sessionVariables = {
+    LIBVA_DRIVER_NAME = "nvidia";
+    GBM_BACKEND = "nvidia-drm";
+    __GLX_VENDOR_LIBRARY_NAME = "nvidia";
+    NVD_BACKEND = "direct";
+    NIXOS_OZONE_WL = 1;
+  };
+
+  nixpkgs.config.cudaSupport = true;
+  nix = {
+    settings = {
+      substituters = [
+        "https://nix-community.cachix.org"
+      ];
+      trusted-public-keys = [
+        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+      ];
+    };
+  };
+}
+