docs: Update README with instructions for building and serving Flutter web release

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

apps/wolf_3d_gui/README.md

@@ -75,6 +75,22 @@ Game data directory selection/persistence is managed by app managers and Flutter
 - **No game data discovered**: choose a valid directory in the picker and ensure files are present.
 - **Linux build/runtime issues**: verify native dependency packages are installed.
 - **Web target limitations**: use desktop target for full native-audio/path behavior.
+- **Web release build won’t load when opening `index.html` directly**: Flutter web output must be served over `http://` or `https://`, not opened with `file://`.
+
+ Build and serve locally:
+
+ ```bash
+ flutter build web --release
+ python3 -m http.server 8080 -d build/web
+ ```
+
+ Then open `http://localhost:8080` in your browser.
+
+ If deploying under a subpath, build with matching base href, for example:
+
+ ```bash
+ flutter build web --release --base-href /wolf_dart/
+ ```
 
 ## Related Modules
 

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;
+}

apps/wolf_3d_gui/pubspec.yaml

@@ -13,6 +13,7 @@ dependencies:
   file_selector: ^1.0.3
   wolf_3d_flutter:
   wolf_3d_dart:
+  wolf_3d_assets:
 
   flutter:
     sdk: flutter

apps/wolf_3d_gui/test/game_data_picker_manager_test.dart

@@ -53,6 +53,7 @@ class _RecordingEngine extends Wolf3dFlutterEngine {
   Future<Wolf3dFlutterEngine> init({
     String? directory,
     Iterable<String>? additionalDirectories,
+    Iterable<WolfensteinData>? seededGames,
   }) async {
     initCallCount++;
     lastDirectory = directory;

apps/wolf_3d_gui/test/packaged_games_loader_test.dart

@@ -0,0 +1,91 @@
+import 'dart:typed_data';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:wolf_3d_dart/wolf_3d_data_types.dart';
+import 'package:wolf_3d_gui/packaged_games_loader.dart';
+
+void main() {
+  group('loadPackagedGames', () {
+    test('loads known packaged directories in order', () async {
+      final requested = <(GameVersion, String)>[];
+
+      final games = await loadPackagedGames(
+        loader: ({required version, required assetDirectory}) async {
+          requested.add((version, assetDirectory));
+          return _buildTestData(version);
+        },
+      );
+
+      expect(requested, <(GameVersion, String)>[
+        (GameVersion.retail, 'assets/retail'),
+        (GameVersion.shareware, 'assets/shareware'),
+        (GameVersion.spearOfDestinyDemo, 'assets/sod/shareware'),
+      ]);
+      expect(games.map((g) => g.version), <GameVersion>[
+        GameVersion.retail,
+        GameVersion.shareware,
+        GameVersion.spearOfDestinyDemo,
+      ]);
+    });
+
+    test('skips failing packaged loads and keeps successful ones', () async {
+      final games = await loadPackagedGames(
+        loader: ({required version, required assetDirectory}) async {
+          if (version == GameVersion.shareware) {
+            throw Exception('shareware unavailable');
+          }
+          return _buildTestData(version);
+        },
+      );
+
+      expect(games.map((g) => g.version), <GameVersion>[
+        GameVersion.retail,
+        GameVersion.spearOfDestinyDemo,
+      ]);
+    });
+  });
+}
+
+WolfensteinData _buildTestData(GameVersion version) {
+  final wallGrid = List.generate(64, (_) => List.filled(64, 0));
+  final objectGrid = List.generate(64, (_) => List.filled(64, 0));
+
+  for (int i = 0; i < 64; i++) {
+    wallGrid[0][i] = 2;
+    wallGrid[63][i] = 2;
+    wallGrid[i][0] = 2;
+    wallGrid[i][63] = 2;
+  }
+  objectGrid[2][2] = MapObject.playerEast;
+
+  return WolfensteinData(
+    version: version,
+    dataVersion: DataVersion.unknown,
+    registry: version == GameVersion.shareware
+        ? SharewareAssetRegistry()
+        : RetailAssetRegistry(),
+    walls: <Sprite>[_sprite(1), _sprite(1), _sprite(2), _sprite(2)],
+    sprites: List<Sprite>.generate(436, (_) => _sprite(255)),
+    sounds: List<PcmSound>.generate(200, (_) => PcmSound(Uint8List(1))),
+    adLibSounds: const <PcmSound>[],
+    music: const <ImfMusic>[],
+    vgaImages: const <VgaImage>[],
+    episodes: <Episode>[
+      Episode(
+        name: 'Test Episode',
+        levels: <WolfLevel>[
+          WolfLevel(
+            name: 'Test Level',
+            wallGrid: wallGrid,
+            areaGrid: List.generate(64, (_) => List.filled(64, -1)),
+            objectGrid: objectGrid,
+            music: Music.level01,
+          ),
+        ],
+      ),
+    ],
+  );
+}
+
+Sprite _sprite(int color) =>
+    Sprite(Uint8List.fromList(List<int>.filled(64 * 64, color)));

apps/wolf_3d_gui/test/wolf3d_gui_app_test.dart

@@ -88,6 +88,7 @@ class _RecordingEngine extends Wolf3dFlutterEngine {
   Future<Wolf3dFlutterEngine> init({
     String? directory,
     Iterable<String>? additionalDirectories,
+    Iterable<WolfensteinData>? seededGames,
   }) async {
     initCallCount++;
     availableGames

packages/wolf_3d_flutter/README.md

@@ -39,7 +39,30 @@ final Wolf3dFlutterEngine engine = await Wolf3dFlutterEngine(
 ).init();
 ```
 
-`init()` handles platform setup, audio init, and configured game-data discovery.
+`init()` handles platform setup, audio init, configured external discovery, and
+optional seeded game injection.
+
+To load packaged game data from `wolf_3d_assets`, use
+`Wolf3dFlutterEngine.loadGameDataFromAssets(...)` and pass the result via
+`seededGames`:
+
+```dart
+final retail = await Wolf3dFlutterEngine.loadGameDataFromAssets(
+  version: GameVersion.retail,
+  packageName: 'wolf_3d_assets',
+  assetDirectory: 'assets/retail',
+);
+
+final shareware = await Wolf3dFlutterEngine.loadGameDataFromAssets(
+  version: GameVersion.shareware,
+  packageName: 'wolf_3d_assets',
+  assetDirectory: 'assets/shareware',
+);
+
+final Wolf3dFlutterEngine engine = await Wolf3dFlutterEngine(
+  debug: kDebugMode,
+).init(seededGames: [retail, shareware]);
+```
 
 The facade itself lives in `lib/engine/wolf3d_flutter_engine.dart` and is re-exported
 through the package barrel at `lib/wolf_3d_flutter.dart`. External consumers

packages/wolf_3d_flutter/lib/engine/wolf3d_flutter_engine.dart

@@ -2,6 +2,7 @@
 library;
 
 import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
 import 'package:wolf_3d_dart/wolf_3d_data.dart';
 import 'package:wolf_3d_dart/wolf_3d_data_types.dart';
 import 'package:wolf_3d_dart/wolf_3d_engine.dart';
@@ -11,6 +12,8 @@ import 'package:wolf_3d_flutter/managers/desktop_windowing_support.dart'
     as desktop_windowing_support;
 import 'package:wolf_3d_flutter/managers/game_data_directory_persistence.dart';
 
+typedef Wolf3dAssetByteLoader = Future<ByteData> Function(String assetKey);
+
 /// Flutter-specific host facade built on top of [Wolf3dEngine].
 ///
 /// This type keeps platform-neutral session and engine state in
@@ -51,12 +54,105 @@ class Wolf3dFlutterEngine extends Wolf3dEngine {
     return this;
   }
 
+  /// Routes shared menu header band diagnostics to [logger].
+  ///
+  /// Pass `null` to disable menu header band diagnostics.
+  @override
+  Wolf3dFlutterEngine setMenuHeaderBandDebugLogger(
+    void Function(String message)? logger,
+  ) {
+    super.setMenuHeaderBandDebugLogger(logger);
+    return this;
+  }
+
+  /// Enables menu header band diagnostics with an optional [prefix].
+  @override
+  Wolf3dFlutterEngine enableMenuHeaderBandDebugLogging({
+    String prefix = '[MENU_HEADER_BAND]',
+  }) {
+    super.enableMenuHeaderBandDebugLogging(prefix: prefix);
+    return this;
+  }
+
+  /// Disables menu header band diagnostics.
+  @override
+  Wolf3dFlutterEngine disableMenuHeaderBandDebugLogging() {
+    super.disableMenuHeaderBandDebugLogging();
+    return this;
+  }
+
+  /// Loads a game data set from Flutter packaged assets.
+  ///
+  /// Intended for loading from dependency asset packages such as
+  /// `wolf_3d_assets` by passing [packageName] and [assetDirectory], then
+  /// supplying the result to [init] via [seededGames].
+  static Future<WolfensteinData> loadGameDataFromAssets({
+    required GameVersion version,
+    required String assetDirectory,
+    String? packageName = 'wolf_3d_assets',
+    AssetRegistry? registryOverride,
+    Wolf3dAssetByteLoader? assetLoader,
+  }) async {
+    final String ext = version.fileExtension;
+    final Wolf3dAssetByteLoader loader = assetLoader ?? rootBundle.load;
+
+    final String normalizedDirectory = assetDirectory.trim().replaceAll(
+      RegExp(r'^/+|/+$'),
+      '',
+    );
+    if (normalizedDirectory.isEmpty) {
+      throw ArgumentError.value(
+        assetDirectory,
+        'assetDirectory',
+        'Must not be empty.',
+      );
+    }
+
+    String keyFor(String fileName) {
+      final path = '$normalizedDirectory/$fileName';
+      final String? normalizedPackage = packageName?.trim();
+      if (normalizedPackage == null || normalizedPackage.isEmpty) {
+        return path;
+      }
+      return 'packages/$normalizedPackage/$path';
+    }
+
+    Future<ByteData> loadRequired(String fileName) {
+      return loader(keyFor(fileName));
+    }
+
+    Future<ByteData> loadWithFallback(
+      String primaryName,
+      String fallbackName,
+    ) async {
+      try {
+        return await loadRequired(primaryName);
+      } catch (_) {
+        return loadRequired(fallbackName);
+      }
+    }
+
+    return WolfensteinLoader.loadFromBytes(
+      version: version,
+      vswap: await loadRequired('VSWAP.$ext'),
+      mapHead: await loadRequired('MAPHEAD.$ext'),
+      gameMaps: await loadWithFallback('GAMEMAPS.$ext', 'MAPTEMP.$ext'),
+      vgaDict: await loadRequired('VGADICT.$ext'),
+      vgaHead: await loadRequired('VGAHEAD.$ext'),
+      vgaGraph: await loadRequired('VGAGRAPH.$ext'),
+      audioHed: await loadRequired('AUDIOHED.$ext'),
+      audioT: await loadRequired('AUDIOT.$ext'),
+      registryOverride: registryOverride,
+    );
+  }
+
   /// Initializes the engine by loading available game data.
   ///
   /// If [directory] is provided, it is persisted and treated as the primary
   /// external search root. If omitted, a previously persisted directory is
   /// used when available. [additionalDirectories] are scanned after the
-  /// primary directory and are not persisted.
+  /// primary directory and are not persisted. [seededGames] are merged first,
+  /// enabling hosts to inject data from packaged assets.
   ///
   /// This method scans only configured external directories, deduplicating
   /// discovered versions by [GameVersion]. Shared package code does not bundle
@@ -64,10 +160,12 @@ class Wolf3dFlutterEngine extends Wolf3dEngine {
   Future<Wolf3dFlutterEngine> init({
     String? directory,
     Iterable<String>? additionalDirectories,
+    Iterable<WolfensteinData>? seededGames,
   }) async {
     await desktop_windowing_support.ensureDesktopWindowingInitialized();
     await audio.init();
     availableGames.clear();
+    _addUniqueGames(seededGames);
 
     final String? requestedDirectory = directory?.trim();
     final String? resolvedDirectory =
@@ -103,14 +201,7 @@ class Wolf3dFlutterEngine extends Wolf3dEngine {
             directoryPath: directoryPath,
             recursive: true,
           );
-          for (final MapEntry<GameVersion, WolfensteinData> entry
+          _addUniqueGames(externalGames.values);
-              in externalGames.entries) {
-            if (!availableGames.any(
-              (WolfensteinData g) => g.version == entry.key,
-            )) {
-              availableGames.add(entry.value);
-            }
-          }
         } catch (e) {
           debugPrint('External discovery failed: $e');
         }
@@ -119,4 +210,15 @@ class Wolf3dFlutterEngine extends Wolf3dEngine {
 
     return this;
   }
+
+  void _addUniqueGames(Iterable<WolfensteinData>? games) {
+    if (games == null) {
+      return;
+    }
+    for (final WolfensteinData game in games) {
+      if (!availableGames.any((g) => g.version == game.version)) {
+        availableGames.add(game);
+      }
+    }
+  }
 }

packages/wolf_3d_flutter/test/wolf_3d_flutter_debug_mode_test.dart

@@ -94,6 +94,57 @@ void main() {
       },
     );
 
+    test('init can seed available games from host-provided data', () async {
+      final tempDir = await Directory.systemTemp.createTemp(
+        'wolf3d-seeded-games-',
+      );
+      addTearDown(() async {
+        if (await tempDir.exists()) {
+          await tempDir.delete(recursive: true);
+        }
+      });
+
+      final persistence = DefaultGameDataDirectoryPersistence(
+        filePath: '${tempDir.path}/settings.json',
+      );
+      final wolf3d = Wolf3dFlutterEngine(
+        audioBackend: _NoopAudio(),
+        dataDirectoryPersistence: persistence,
+      );
+      final retail = _buildTestData(version: GameVersion.retail);
+      final shareware = _buildTestData(version: GameVersion.shareware);
+
+      await wolf3d.init(seededGames: [retail, shareware]);
+
+      expect(wolf3d.availableGames, hasLength(2));
+      expect(
+        wolf3d.availableGames.map((g) => g.version),
+        containsAll([GameVersion.retail, GameVersion.shareware]),
+      );
+    });
+
+    test('loadGameDataFromAssets prefixes keys for package assets', () async {
+      final requestedKeys = <String>[];
+
+      await expectLater(
+        () => Wolf3dFlutterEngine.loadGameDataFromAssets(
+          version: GameVersion.retail,
+          assetDirectory: 'assets/retail',
+          packageName: 'wolf_3d_assets',
+          assetLoader: (String key) async {
+            requestedKeys.add(key);
+            throw Exception('Expected test stop after first key.');
+          },
+        ),
+        throwsException,
+      );
+
+      expect(
+        requestedKeys,
+        contains('packages/wolf_3d_assets/assets/retail/VSWAP.WL6'),
+      );
+    });
+
     testWidgets('GameScreen hides debug FAB when debug mode is disabled', (
       tester,
     ) async {
@@ -168,7 +219,9 @@ class _TestWolf3d extends Wolf3dFlutterEngine {
   }
 }
 
-WolfensteinData _buildTestData() {
+WolfensteinData _buildTestData({
+  GameVersion version = GameVersion.retail,
+}) {
   final wallGrid = List.generate(64, (_) => List.filled(64, 0));
   final objectGrid = List.generate(64, (_) => List.filled(64, 0));
 
@@ -181,9 +234,11 @@ WolfensteinData _buildTestData() {
   objectGrid[2][2] = MapObject.playerEast;
 
   return WolfensteinData(
-    version: GameVersion.retail,
+    version: version,
     dataVersion: DataVersion.unknown,
-    registry: RetailAssetRegistry(),
+    registry: version == GameVersion.shareware
+        ? SharewareAssetRegistry()
+        : RetailAssetRegistry(),
     walls: [_sprite(1), _sprite(1), _sprite(2), _sprite(2)],
     sprites: List.generate(436, (_) => _sprite(255)),
     sounds: List.generate(200, (_) => PcmSound(Uint8List(1))),