cross compile for windows and macOS

default.nix

@@ -1,5 +1,4 @@
-{
+{ lib,
-  lib,
   rustPlatform,
   nix-gitignore,
   bash,
@@ -11,6 +10,8 @@
   pkg-config,
   libxkbcommon,
   pkgs,
+  stdenv,
+  targetPackages ? pkgs,
 }: let
   version = (builtins.fromTOML (builtins.readFile ./engine/Cargo.toml)).package.version;
   src = nix-gitignore.gitignoreSource [] ./.;
@@ -19,35 +20,53 @@ in
   pname = "zenyx";
   inherit src version;
   cargoLock.lockFile = ./Cargo.lock;
+
   nativeBuildInputs = [
-      makeWrapper
     pkg-config
+  ] ++ lib.optionals stdenv.targetPlatform.isDarwin [
+    targetPackages.darwin.apple_sdk.frameworks.CoreServices
   ]; 
-    buildInputs = with pkgs; [
+
-      wayland
+  buildInputs = with targetPackages; [
+    dav1d
+  ] ++ lib.optionals (stdenv.targetPlatform.isLinux || stdenv.targetPlatform.isWindows) [
     vulkan-loader
+  ] ++ lib.optionals stdenv.targetPlatform.isLinux [
+    makeWrapper
+    wayland
     libxkbcommon
     libGL
-      libxkbcommon
     xorg.libXcursor
     xorg.libXrandr
     xorg.libXi
     xorg.libX11
     xorg.libxcb
     bash 
-      dav1d
+  ] ++ 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
   ];
-    doCheck = false;
-    LD_LIBRARY_PATH = "${pkgs.lib.makeLibraryPath buildInputs}";
 
-    fixupPhase = ''
+  CARGO_TARGET_X86_64_PC_WINDOWS_GNU_LINKER = 
-      wrapProgram $out/bin/${pname} --set PATH ${bash}/bin:\$PATH --set LD_LIBRARY_PATH ${pkgs.lib.makeLibraryPath buildInputs}
+    lib.optionalString stdenv.targetPlatform.isWindows "${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 = "Test";
+    description = "Cross-platform WSYWIG Game Engine";
     license = lib.licenses.mit;
-      platforms = lib.platforms.linux;
+    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 {