faucet(gui): configure video acceleration

faucet/gui/default.nix

@@ -6,6 +6,7 @@
 in {
   imports = [
     ./plymouth.nix
+    ./va.nix
     ./greetd.nix
   ];
 

faucet/gui/va.nix

@@ -0,0 +1,21 @@
+# https://nixos.wiki/wiki/Accelerated_Video_Playback
+
+{ pkgs
+, lib
+, config
+, ... }: with lib; let
+  cfg = config.faucet.gui;
+in mkIf cfg.enable {
+  nixpkgs.config.packageOverrides = pkgs: {
+    vaapiIntel = pkgs.vaapiIntel.override { enableHybridCodec = true; };
+  };
+
+  hardware.opengl = {
+    extraPackages = with pkgs; optionals ((cfg.type == "intel") || (cfg.type == "prime")) [
+      intel-media-driver # LIBVA_DRIVER_NAME=iHD
+      vaapiIntel         # LIBVA_DRIVER_NAME=i965 (older but works better for Firefox/Chromium)
+      vaapiVdpau
+      libvdpau-va-gl
+    ] ++ optional ((cfg.type == "nvidia") || (cfg.type == "prime")) nvidia-vaapi-driver;
+  };
+}