Move initialization and access to a singleton

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

lib/features/difficulty/difficulty_screen.dart

@@ -4,15 +4,13 @@ import 'package:wolf_3d_data_types/wolf_3d_data_types.dart';
 import 'package:wolf_3d_synth/wolf_3d_synth.dart';
 import 'package:wolf_dart/features/difficulty/difficulty.dart';
 import 'package:wolf_dart/features/renderer/renderer.dart';
+import 'package:wolf_dart/wolf_3d.dart';
 
 class DifficultyScreen extends StatefulWidget {
-  const DifficultyScreen(
-    this.data, {
+  const DifficultyScreen({
     super.key,
   });
 
-  final WolfensteinData data;
-
   @override
   State<DifficultyScreen> createState() => _DifficultyScreenState();
 }
@@ -21,7 +19,7 @@ class _DifficultyScreenState extends State<DifficultyScreen> {
   AudioSource? _menuMusicSource;
   SoundHandle? _menuMusicHandle;
 
-  bool get isShareware => widget.data.version == GameVersion.shareware;
+  bool get isShareware => Wolf3d.I.activeGame.version == GameVersion.shareware;
 
   @override
   void initState() {
@@ -37,9 +35,9 @@ class _DifficultyScreenState extends State<DifficultyScreen> {
     }
 
     // 2. We only want to play music if the IMF data actually exists
-    if (widget.data.music.isNotEmpty) {
+    if (Wolf3d.I.music.isNotEmpty) {
       // Get the first track (usually the menu theme "Wondering About My Loved Ones")
-      final music = widget.data.music.first;
+      final music = Wolf3d.I.music.first;
 
       // Render the hardware instructions into PCM and wrap in a WAV header
       final pcmSamples = ImfRenderer.render(music);
@@ -85,7 +83,7 @@ class _DifficultyScreenState extends State<DifficultyScreen> {
     Navigator.of(context).pushReplacement(
       MaterialPageRoute(
         builder: (_) => WolfRenderer(
-          widget.data,
+          Wolf3d.I.activeGame,
           difficulty: difficulty,
           isShareware: isShareware,
           showSpriteGallery: showGallery,

lib/game_select_screen.dart

@@ -1,9 +1,7 @@
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
-import 'package:wolf_3d_data/wolf_3d_data.dart';
 import 'package:wolf_3d_data_types/wolf_3d_data_types.dart';
 import 'package:wolf_dart/features/difficulty/difficulty_screen.dart';
+import 'package:wolf_dart/wolf_3d.dart';
 
 class GameSelectScreen extends StatelessWidget {
   const GameSelectScreen({super.key});
@@ -11,115 +9,27 @@ class GameSelectScreen extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      body: FutureBuilder(
-        future: loadData(),
-        builder: (context, snapshot) {
-          if (snapshot.connectionState == ConnectionState.waiting) {
-            return CircularProgressIndicator();
-          }
+      body: ListView.builder(
+        itemCount: Wolf3d.I.availableGames.length,
+        itemBuilder: (context, i) {
+          final WolfensteinData data = Wolf3d.I.availableGames[i];
+          final GameVersion version = data.version;
 
-          if (!snapshot.hasData) {
-            return Text("Unable to load data");
-          }
-
-          final List<WolfensteinData> loadedGames = snapshot.data!;
-
-          if (loadedGames.length == 1) {
-            WidgetsBinding.instance.addPostFrameCallback((_) {
-              Navigator.of(context).push(
-                MaterialPageRoute(
-                  builder: (context) => DifficultyScreen(loadedGames.first),
-                ),
-              );
-            });
-          }
-
-          return ListView.builder(
-            itemCount: loadedGames.length,
-            itemBuilder: (context, i) {
-              final WolfensteinData data = loadedGames[i];
-              final GameVersion version = data.version;
-
-              return Card(
-                child: ListTile(
-                  title: Text(version.name),
-                  onTap: () {
-                    Navigator.of(context).push(
-                      MaterialPageRoute(
-                        builder: (context) => DifficultyScreen(data),
-                      ),
-                    );
-                  },
-                ),
-              );
-            },
+          return Card(
+            child: ListTile(
+              title: Text(version.name),
+              onTap: () {
+                Wolf3d.I.setActiveGame(data);
+                Navigator.of(context).push(
+                  MaterialPageRoute(
+                    builder: (context) => DifficultyScreen(),
+                  ),
+                );
+              },
+            ),
           );
         },
       ),
     );
   }
-
-  Future<ByteData?> tryLoad(String path) async {
-    try {
-      return await rootBundle.load(path);
-    } catch (e) {
-      debugPrint("Asset not found: $path");
-      return null;
-    }
-  }
-
-  Future<List<WolfensteinData>> loadData({String? directory}) async {
-    final List<WolfensteinData> loadedGames = [];
-
-    // 1. Always attempt to load bundled assets first (works on ALL platforms)
-    final versionsToTry = [
-      (version: GameVersion.retail, path: 'retail'),
-      (version: GameVersion.shareware, path: 'shareware'),
-    ];
-
-    for (final version in versionsToTry) {
-      try {
-        final ext = version.version.fileExtension;
-        final folder = 'assets/${version.path}';
-
-        final data = WolfensteinLoader.loadFromBytes(
-          version: version.version,
-          vswap: await tryLoad('$folder/VSWAP.$ext'),
-          mapHead: await tryLoad('$folder/MAPHEAD.$ext'),
-          gameMaps: await tryLoad('$folder/GAMEMAPS.$ext'),
-          vgaDict: await tryLoad('$folder/VGADICT.$ext'),
-          vgaHead: await tryLoad('$folder/VGAHEAD.$ext'),
-          vgaGraph: await tryLoad('$folder/VGAGRAPH.$ext'),
-          audioHed: await tryLoad('$folder/AUDIOHED.$ext'),
-          audioT: await tryLoad('$folder/AUDIOT.$ext'),
-        );
-
-        loadedGames.add(data);
-      } catch (e) {
-        // The loader now provides the specific error:
-        // "ArgumentError: Cannot load retail: Missing files: VSWAP.WL6, ..."
-        debugPrint(e.toString());
-      }
-    }
-
-    // 2. On non-web, also check for external files in a specific "games" folder
-    // if you want to support side-loading.
-    if (!kIsWeb) {
-      try {
-        final externalGames = await WolfensteinLoader.discover(
-          directoryPath: directory,
-          recursive: true,
-        );
-        for (var entry in externalGames.entries) {
-          if (!loadedGames.any((g) => g.version == entry.key)) {
-            loadedGames.add(entry.value);
-          }
-        }
-      } catch (e) {
-        debugPrint("External discovery failed: $e");
-      }
-    }
-
-    return loadedGames;
-  }
 }

lib/main.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_soloud/flutter_soloud.dart';
 import 'package:wolf_dart/game_select_screen.dart';
+import 'package:wolf_dart/wolf_3d.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -11,6 +12,8 @@ void main() async {
     channels: Channels.stereo,
   );
 
+  await Wolf3d.I.init();
+
   runApp(
     const MaterialApp(
       home: GameSelectScreen(),

lib/wolf_3d.dart

@@ -0,0 +1,96 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+import 'package:wolf_3d_data/wolf_3d_data.dart';
+import 'package:wolf_3d_data_types/wolf_3d_data_types.dart';
+
+class Wolf3d {
+  Wolf3d._();
+  static final Wolf3d _instance = Wolf3d._();
+  static Wolf3d get I => _instance;
+
+  // --- State ---
+  final List<WolfensteinData> availableGames = [];
+  WolfensteinData? _activeGame;
+
+  // --- Getters ---
+  WolfensteinData get activeGame {
+    if (_activeGame == null) {
+      throw StateError("No active game selected. Call setActiveGame() first.");
+    }
+    return _activeGame!;
+  }
+
+  // Convenience getters for the active game's assets
+  List<WolfLevel> get levels => activeGame.levels;
+  List<Sprite> get walls => activeGame.walls;
+  List<Sprite> get sprites => activeGame.sprites;
+  List<PcmSound> get sounds => activeGame.sounds;
+  List<AdLibSound> get adLibSounds => activeGame.adLibSounds;
+  List<ImfMusic> get music => activeGame.music;
+  List<VgaImage> get vgaImages => activeGame.vgaImages;
+
+  // --- Actions ---
+  void setActiveGame(WolfensteinData game) {
+    _activeGame = game;
+  }
+
+  /// Initializes the engine by loading available game data.
+  Future<void> init({String? directory}) async {
+    availableGames.clear();
+
+    // 1. Bundle asset loading (migrated from GameSelectScreen)
+    final versionsToTry = [
+      (version: GameVersion.retail, path: 'retail'),
+      (version: GameVersion.shareware, path: 'shareware'),
+    ];
+
+    for (final version in versionsToTry) {
+      try {
+        final ext = version.version.fileExtension;
+        final folder = 'assets/${version.path}';
+
+        final data = WolfensteinLoader.loadFromBytes(
+          version: version.version,
+          vswap: await _tryLoad('$folder/VSWAP.$ext'),
+          mapHead: await _tryLoad('$folder/MAPHEAD.$ext'),
+          gameMaps: await _tryLoad('$folder/GAMEMAPS.$ext'),
+          vgaDict: await _tryLoad('$folder/VGADICT.$ext'),
+          vgaHead: await _tryLoad('$folder/VGAHEAD.$ext'),
+          vgaGraph: await _tryLoad('$folder/VGAGRAPH.$ext'),
+          audioHed: await _tryLoad('$folder/AUDIOHED.$ext'),
+          audioT: await _tryLoad('$folder/AUDIOT.$ext'),
+        );
+
+        availableGames.add(data);
+      } catch (e) {
+        debugPrint(e.toString());
+      }
+    }
+
+    // 2. External side-loading (non-web)
+    if (!kIsWeb) {
+      try {
+        final externalGames = await WolfensteinLoader.discover(
+          directoryPath: directory,
+          recursive: true,
+        );
+        for (var entry in externalGames.entries) {
+          if (!availableGames.any((g) => g.version == entry.key)) {
+            availableGames.add(entry.value);
+          }
+        }
+      } catch (e) {
+        debugPrint("External discovery failed: $e");
+      }
+    }
+  }
+
+  Future<ByteData?> _tryLoad(String path) async {
+    try {
+      return await rootBundle.load(path);
+    } catch (e) {
+      debugPrint("Asset not found: $path");
+      return null;
+    }
+  }
+}

packages/wolf_3d_synth/lib/wolf_3d_synth.dart

@@ -3,4 +3,4 @@
 /// More dartdocs go here.
 library;
 
-export 'src/imf_renderer.dart' show ImfRenderer, NumChannels;
+export 'src/imf_renderer.dart' show ImfRenderer;