split CPU and GPU from common/cpu/intel

fix #388

common/cpu/intel/cpu-only.nix

@@ -0,0 +1,6 @@
+{ config, lib, pkgs, ... }:
+
+{
+  hardware.cpu.intel.updateMicrocode =
+    lib.mkDefault config.hardware.enableRedistributableFirmware;
+}

common/cpu/intel/default.nix

@@ -1,19 +1,8 @@
 { config, lib, pkgs, ... }:
 
 {
-  boot.initrd.kernelModules = [ "i915" ];
-
-  environment.variables = {
-    VDPAU_DRIVER = lib.mkIf config.hardware.opengl.enable (lib.mkDefault "va_gl");
-  };
-
-  hardware.cpu.intel.updateMicrocode =
-    lib.mkDefault config.hardware.enableRedistributableFirmware;
-  
-  hardware.opengl.extraPackages = with pkgs; [
-    vaapiIntel
-    vaapiVdpau
-    libvdpau-va-gl
-    intel-media-driver
+  imports = [
+    ./cpu-only.nix
+    ../../gpu/intel.nix
   ];
 }

common/gpu/intel.nix

@@ -0,0 +1,15 @@
+{ config, lib, pkgs, ... }:
+
+{
+  boot.initrd.kernelModules = [ "i915" ];
+
+  environment.variables = {
+    VDPAU_DRIVER = lib.mkIf config.hardware.opengl.enable (lib.mkDefault "va_gl");
+  };
+
+  hardware.opengl.extraPackages = with pkgs; [
+    vaapiIntel
+    libvdpau-va-gl
+    intel-media-driver
+  ];
+}

common/gpu/nvidia.nix

@@ -19,4 +19,8 @@ in
     offload.enable = lib.mkDefault true;
     # Hardware should specify the bus ID for intel/nvidia devices
   };
+
+  hardware.opengl.extraPackages = with pkgs; [
+    vaapiVdpau
+  ];
 }

flake.nix

@@ -121,6 +121,7 @@
 
       common-cpu-amd = import ./common/cpu/amd;
       common-cpu-intel = import ./common/cpu/intel;
+      common-cpu-intel-cpu-only = import ./common/cpu/intel/cpu-only;
       common-cpu-intel-kaby-lake = import ./common/cpu/intel/kaby-lake;
       common-cpu-intel-sandy-bridge = import ./common/cpu/intel/sandy-bridge;
       common-gpu-amd = import ./common/gpu/amd;