Add gpu settings

system/shared/hardware/gpu/amd.nix

@@ -0,0 +1,39 @@
+# WARNING: This file is currently untested 
+# (I didn't yet run this NixOS config on any AMD GPU systems)
+{ config, lib, pkgs, ... }:
+let
+  dev = config.myOptions.device;
+in
+{
+  config = lib.mkIf (dev.gpu.type == "amd") {
+    services.xserver.videoDrivers = lib.mkDefault ["modesetting" "amdgpu"];
+
+    boot = {
+      initrd.kernelModules = ["amdgpu"];  # load amdgpu kernel module as early as initrd
+      kernelModules = ["amdgpu"]; # if loading somehow fails during initrd but the boot continues, try again later
+    };
+
+    environment.systemPackages = with pkgs; [
+      mesa
+
+      vulkan-tools
+      vulkan-loader
+      vulkan-validation-layers
+      vulkan-extension-layer
+    ];
+
+    # Enable OpenGL
+    hardware.opengl = {
+      enable = true;
+
+      # Enable OpenCL and AMDVLK
+      extraPackages = with pkgs; [
+        amdvlk
+        rcomPackages.clr.icd
+      ];
+      extraPackages32 = with pkgs; [
+        driversi686Linux.amdvlk
+      ];
+    };
+  };
+}