feat: environment variables for wayland & nvidia

home/linux/gui/base/desktop/nvidia.nix

@@ -0,0 +1,26 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib;
+let
+  cfg = config.modules.desktop.nvidia;
+in
+{
+  options.modules.desktop.nvidia = {
+    enable = mkEnableOption "whether nvidia GPU is used";
+  };
+
+  config = mkIf (cfg.enable && cfg.enable) {
+    home.sessionVariables = {
+      # for hyprland with nvidia gpu" = " ref https://wiki.hyprland.org/Nvidia/
+      "LIBVA_DRIVER_NAME" = "nvidia";
+      "__GLX_VENDOR_LIBRARY_NAME" = "nvidia";
+      # VA-API hardware video acceleration
+      "NVD_BACKEND" = "direct";
+
+      "GBM_BACKEND" = "nvidia-drm";
+    };
+  };
+}