hardware/gpu: add gpu module

modules/modules/hardware/form.nix

@@ -41,6 +41,11 @@ in
     })
     (mkIf cfg.portable {
       modules.hardware = {
+        gpu = {
+          nvidia = mkDefault true;
+          intel = mkDefault true;
+          amdgpu = mkDefault true;
+        };
         wireless.enable = mkDefault true;
       };
     })

modules/modules/hardware/gpu.nix

@@ -0,0 +1,48 @@
+{ config, lib, ... }:
+with lib;
+with lib.hlissner;
+let
+  cfg = config.modules.hardware.gpu;
+in
+{
+  options.modules.hardware.gpu = {
+    amdgpu = mkBoolOpt false;
+    nvidia = mkBoolOpt false;
+    intel = mkBoolOpt false;
+  };
+
+  config = mkMerge [
+    (mkIf (any (with cfg; [ amdgpu nvidia intel ])) {
+      hardware.opengl = {
+        enable = true;
+        driSupport = true;
+        driSupport32Bit = true;
+
+        extraPackages = with pkgs; [
+          vaapiVdpau
+          libvdpau-va-gl
+        ];
+      };
+    })
+
+    (mkIf cfg.amdgpu {
+      boot.initrd.kernelModules = [ "amdgpu" ];
+      services.xserver.videoDrivers = [ "amdgpu" ];
+    })
+
+    (mkIf cfg.nvidia {
+      services.xserver.videoDrivers = [ "nvidia" ];
+
+      hardware.nvidia = {
+        modesetting.enable = true;
+        powerManagement.enable = true;
+      };
+
+      virtualisation.docker.enableNvidia = true;
+    })
+
+    (mkIf cfg.intel {
+      hardware.opengl.extraPackages = with pkgs; [ intel-media-driver vaapiIntel ];
+    })
+  ];
+}