cross compile for windows and macOS

default.nix

@@ -1,5 +1,4 @@
-{
-  lib,
+{ lib,
   rustPlatform,
   nix-gitignore,
   bash,
@@ -11,43 +10,63 @@
   pkg-config,
   libxkbcommon,
   pkgs,
+  stdenv,
+  targetPackages ? pkgs,
 }: let
   version = (builtins.fromTOML (builtins.readFile ./engine/Cargo.toml)).package.version;
   src = nix-gitignore.gitignoreSource [] ./.;
 in
-  rustPlatform.buildRustPackage rec {
-    pname = "zenyx";
-    inherit src version;
-    cargoLock.lockFile = ./Cargo.lock;
-    nativeBuildInputs = [
-      makeWrapper
-      pkg-config
-    ];
-    buildInputs = with pkgs; [
-      wayland
-      vulkan-loader
-      libxkbcommon
-      libGL
-      libxkbcommon
-      xorg.libXcursor
-      xorg.libXrandr
-      xorg.libXi
-      xorg.libX11
-      xorg.libxcb
-      bash
-      dav1d
-    ];
-    doCheck = false;
-    LD_LIBRARY_PATH = "${pkgs.lib.makeLibraryPath buildInputs}";
+rustPlatform.buildRustPackage rec {
+  pname = "zenyx";
+  inherit src version;
+  cargoLock.lockFile = ./Cargo.lock;
 
-    fixupPhase = ''
-      wrapProgram $out/bin/${pname} --set PATH ${bash}/bin:\$PATH --set LD_LIBRARY_PATH ${pkgs.lib.makeLibraryPath buildInputs}
-    '';
+  nativeBuildInputs = [
+    pkg-config
+  ] ++ lib.optionals stdenv.targetPlatform.isDarwin [
+    targetPackages.darwin.apple_sdk.frameworks.CoreServices
+  ]; 
 
-    meta = {
-      description = "Test";
-      license = lib.licenses.mit;
-      platforms = lib.platforms.linux;
-      mainProgram = "zenyx";
-    };
-  }
+  buildInputs = with targetPackages; [
+    dav1d
+  ] ++ lib.optionals (stdenv.targetPlatform.isLinux || stdenv.targetPlatform.isWindows) [
+    vulkan-loader
+  ] ++ lib.optionals stdenv.targetPlatform.isLinux [
+    makeWrapper
+    wayland
+    libxkbcommon
+    libGL
+    xorg.libXcursor
+    xorg.libXrandr
+    xorg.libXi
+    xorg.libX11
+    xorg.libxcb
+    bash 
+  ] ++ lib.optionals stdenv.targetPlatform.isDarwin [
+    makeWrapper
+    darwin.apple_sdk.frameworks.Cocoa
+    darwin.apple_sdk.frameworks.Metal
+    darwin.apple_sdk.frameworks.CoreVideo
+    darwin.apple_sdk.frameworks.QuartzCore
+  ];
+
+  CARGO_TARGET_X86_64_PC_WINDOWS_GNU_LINKER = 
+    lib.optionalString stdenv.targetPlatform.isWindows "${stdenv.cc.targetPrefix}gcc";
+
+  NIX_LDFLAGS = lib.optionalString stdenv.targetPlatform.isDarwin "-framework CoreFoundation";
+
+  postInstall = lib.optionalString stdenv.targetPlatform.isLinux ''
+    wrapProgram $out/bin/${pname} \
+      --prefix PATH : ${lib.makeBinPath [ bash ]} \
+      --set LD_LIBRARY_PATH ${lib.makeLibraryPath buildInputs}
+  '';
+
+  doCheck = false;
+
+  meta = {
+    description = "Cross-platform WSYWIG Game Engine";
+    license = lib.licenses.mit;
+    platforms = lib.platforms.all;
+    mainProgram = "zenyx";
+  };
+}

flake.nix

@@ -48,6 +48,12 @@
         packages = {
           inherit (pkgs) zenyx;
           default = pkgs.zenyx;
+          windows = let 
+            pkgsCross = import nixpkgs {
+              system = "x86_64-linux";
+              crossSystem = nixpkgs.lib.systems.examples.mingwW64;
+            };
+          in pkgsCross.callPackage ./default.nix {};
         };
 
         devShells.default = pkgs.mkShell {