feat: Implement packaged games loading and update engine initialization to support seeded games

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

apps/wolf_3d_gui/lib/main.dart

@@ -2,15 +2,18 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:wolf_3d_flutter/wolf_3d_flutter.dart';
 
+import 'packaged_games_loader.dart';
 import 'wolf3d_gui_app.dart';
 
 /// Creates the application shell after loading available Wolf3D data sets.
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
+  final seededGames = await loadPackagedGames();
+
   final Wolf3dFlutterEngine wolf3d = await Wolf3dFlutterEngine(
     debug: kDebugMode,
-  ).init();
+  ).init(seededGames: seededGames);
 
   if (kDebugMode) {
     wolf3d.enableMenuHeaderBandDebugLogging(prefix: '[wolf_3d_gui]');

apps/wolf_3d_gui/lib/packaged_games_loader.dart

@@ -0,0 +1,54 @@
+import 'package:flutter/foundation.dart';
+import 'package:wolf_3d_dart/wolf_3d_data_types.dart';
+import 'package:wolf_3d_flutter/wolf_3d_flutter.dart';
+
+typedef PackagedGameDataLoader =
+    Future<WolfensteinData> Function({
+      required GameVersion version,
+      required String assetDirectory,
+    });
+
+Future<List<WolfensteinData>> loadPackagedGames({
+  PackagedGameDataLoader? loader,
+}) async {
+  final PackagedGameDataLoader effectiveLoader =
+      loader ??
+      ({required version, required assetDirectory}) =>
+          Wolf3dFlutterEngine.loadGameDataFromAssets(
+            version: version,
+            packageName: 'wolf_3d_assets',
+            assetDirectory: assetDirectory,
+          );
+
+  final List<WolfensteinData> games = [];
+
+  Future<void> tryLoad({
+    required GameVersion version,
+    required String assetDirectory,
+  }) async {
+    try {
+      games.add(
+        await effectiveLoader(
+          version: version,
+          assetDirectory: assetDirectory,
+        ),
+      );
+    } catch (e) {
+      debugPrint(
+        'Packaged game load skipped for ${version.label} ($assetDirectory): $e',
+      );
+    }
+  }
+
+  await tryLoad(version: GameVersion.retail, assetDirectory: 'assets/retail');
+  await tryLoad(
+    version: GameVersion.shareware,
+    assetDirectory: 'assets/shareware',
+  );
+  await tryLoad(
+    version: GameVersion.spearOfDestinyDemo,
+    assetDirectory: 'assets/sod/shareware',
+  );
+
+  return games;
+}