Add gamescope optionally.

default.nix

@@ -13,7 +13,9 @@
   applyReccomendedWinePatches ? true,
   virtualDesktop ? null,
   registryFiles ? [ ],
-  captureMouse ? true
+  captureMouse ? true,
+  enableGameScope ? false,
+  gameScopeArgs ? [ "-W 2560" "-H 1440" "-b" ],
 }:
 
 #check wether string is two positive integers separated by x
@@ -31,6 +33,7 @@ let
   dxvk = (pkgsCross.mingwW64.callPackage ./dxvk.nix { async = dxvkAsync;  }).overrideAttrs
   ( attrs: {  patches = attrs.patches ++ dxvkPatches; });
   dxvkAsyncEnv = "DXVK_ASYNC=1" ;
+  gamescope = "${pkgs.callPackage ./gamescope.nix {}}/bin/gamescope";
 
   fonts = pkgs.callPackage ./fonts.nix {};
   wine64 = "${winePkg}/bin/wine64";
@@ -117,7 +120,7 @@ let
       if [ ! -f "${installDir}/Roberts Space Industries/RSI Launcher/RSI Launcher.exe" ]; then
         installLauncher
       fi
-
+      ${lib.optionalString enableGameScope "${gamescope} ${builtins.concatStringsSep " " gameScopeArgs} --\\" }
       ${wineMulti} \
       ${if virtualDesktop != null then "explorer /desktop=${binName},${virtualDesktop}" else ""} \
       "$WINEPREFIX/drive_c/Program Files/Roberts Space Industries/RSI Launcher/RSI Launcher.exe" \

gamescope.nix

@@ -0,0 +1,50 @@
+{ stdenv, lib, pkgs, fetchFromGitHub, meson, ninja, wlroots, pkg-config, cmake, xorg, libdrm,
+vulkan-loader, wayland, wayland-protocols, libxkbcommon, libcap, SDL2, glslang, libudev, pixman, libinput, }:
+
+ stdenv.mkDerivation rec {
+  pname = "gamescope";
+  version = "3.8.4";
+
+  src = fetchFromGitHub {
+    owner = "Plagman";
+    repo = pname;
+    rev = version;
+    sha256 = "1asgyxm05wqmcrvl9i50zx7yrg8ipw6pb5j0bzz31gn589rysgix";
+    fetchSubmodules = true;
+  };
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkg-config
+    cmake
+  ];
+  buildInputs = [
+    (pkgs.callPackage (pkgs.fetchurl {
+      name = "wlroots_13.nix";
+      url = "https://raw.githubusercontent.com/NixOS/nixpkgs/c4976f356529978031f1ad2200015ad03de50cb9/pkgs/development/libraries/wlroots/default.nix";
+      sha256 = "49f053124e9029a6863582940af9fefc5e3012353a6b86a2e2214dc7cf6467da";
+    }) {})
+    libdrm
+    libxkbcommon
+    vulkan-loader
+    wayland
+    wayland-protocols
+    xorg.libX11
+    xorg.libXdamage
+    xorg.libXcomposite
+    xorg.libXrender
+    xorg.libXext
+    xorg.libXxf86vm
+    xorg.libXtst
+    xorg.libXres
+    xorg.libXi
+    libcap
+    SDL2
+    glslang
+    libudev
+    pixman
+    libinput
+  ];
+}
+