home: add lsfg-vk module

user/lsfg-vk/default.nix

@@ -0,0 +1,36 @@
+{ pkgs, config, ... }:
+let
+  LosslessDllPath = config.home.homeDirectory + "/.local/lib/Lossless.dll";
+in
+{
+  home.file = {
+    ".local/share/vulkan/implicit_layer.d/VkLayer_LS_frame_generation.json".source =
+      "${pkgs.lsfg-vk}/share/vulkan/implicit_layer.d/VkLayer_LS_frame_generation.json";
+    ".local/lib/liblsfg-vk.so".source = "${pkgs.lsfg-vk}/lib/liblsfg-vk.so";
+  };
+
+  home.sessionVariables = {
+    # ENABLE_LSFG = 1; # Don't enable session wide, to avoid bugs
+    LSFG_MULTIPLIER = 2;
+    LSFG_DLL_PATH = LosslessDllPath;
+  };
+
+  # Put the dll in a reachable location for steam games
+  # Secrets normally are a symlink to /run/user/1000/secrets.d/
+  # Every time sops-nix.service runs, we copy the dll
+  systemd.user.services.copy-lsfg-dll = {
+    Service = {
+      ExecStart = pkgs.writeShellScript "copy-lsfg-dll" ''
+        cp -fv "${config.sops.secrets."lsfg.dll".path}" "${LosslessDllPath}"
+      '';
+      Type = "oneshot";
+    };
+    Unit.After = [ "sops-nix.service" ];
+    Install.WantedBy = [ "sops-nix.service" ];
+  };
+
+  sops.secrets."lsfg.dll" = {
+    sopsFile = ../../secrets/lsfg.dll.gpg;
+    format = "binary";
+  };
+}