Add shareware support and spawn correctly for difficulty levels

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

lib/features/map/vswap_parser.dart

@@ -1,6 +1,7 @@
 import 'dart:typed_data';
 
 import 'package:wolf_dart/classes/matrix.dart';
+import 'package:wolf_dart/classes/sprite.dart';
 
 class VswapParser {
   /// Extracts the 64x64 wall textures from VSWAP.WL1
@@ -17,7 +18,7 @@ class VswapParser {
     }
 
     // 3. Extract the Wall Textures
-    List<List<List<int>>> textures = [];
+    List<Sprite> textures = [];
 
     // Walls are chunks 0 through (spriteStart - 1)
     for (int i = 0; i < spriteStart; i++) {
@@ -26,7 +27,7 @@ class VswapParser {
 
       // Walls are always exactly 64x64 pixels (4096 bytes)
       // Note: Wolf3D stores pixels in COLUMN-MAJOR order (Top to bottom, then left to right)
-      List<List<int>> texture = List.generate(64, (_) => List.filled(64, 0));
+      Sprite texture = List.generate(64, (_) => List.filled(64, 0));
 
       for (int x = 0; x < 64; x++) {
         for (int y = 0; y < 64; y++) {

lib/features/map/wolf_map.dart

@@ -18,14 +18,18 @@ class WolfMap {
   );
 
   /// Asynchronously loads the map files and parses them into a new WolfMap instance.
-  static Future<WolfMap> loadDemo() async {
+  static Future<WolfMap> loadShareware() async {
     // 1. Load the binary data
     final mapHead = await rootBundle.load("assets/MAPHEAD.WL1");
     final gameMaps = await rootBundle.load("assets/GAMEMAPS.WL1");
     final vswap = await rootBundle.load("assets/VSWAP.WL1");
 
     // 2. Parse the data using the parser we just built
-    final parsedLevels = WolfMapParser.parseMaps(mapHead, gameMaps);
+    final parsedLevels = WolfMapParser.parseMaps(
+      mapHead,
+      gameMaps,
+      isShareware: true,
+    );
     final parsedTextures = VswapParser.parseWalls(vswap);
     final parsedSprites = VswapParser.parseSprites(vswap);
 
@@ -38,7 +42,7 @@ class WolfMap {
   }
 
   /// Asynchronously loads the map files and parses them into a new WolfMap instance.
-  static Future<WolfMap> load() async {
+  static Future<WolfMap> loadRetail() async {
     // 1. Load the binary data
     final mapHead = await rootBundle.load("assets/MAPHEAD.WL6");
     final gameMaps = await rootBundle.load("assets/GAMEMAPS.WL6");

lib/features/map/wolf_map_parser.dart

@@ -2,11 +2,16 @@ import 'dart:convert';
 import 'dart:typed_data';
 
 import 'package:wolf_dart/classes/matrix.dart';
+import 'package:wolf_dart/features/entities/map_objects.dart';
 import 'package:wolf_dart/features/map/wolf_level.dart';
 
 abstract class WolfMapParser {
   /// Parses MAPHEAD and GAMEMAPS to extract the raw level data.
-  static List<WolfLevel> parseMaps(ByteData mapHead, ByteData gameMaps) {
+  static List<WolfLevel> parseMaps(
+    ByteData mapHead,
+    ByteData gameMaps, {
+    bool isShareware = false,
+  }) {
     List<WolfLevel> levels = [];
 
     // 1. READ MAPHEAD
@@ -66,6 +71,21 @@ abstract class WolfMapParser {
       Uint16List carmackExpandedObjects = _expandCarmack(compressedObjectData);
       List<int> flatObjectGrid = _expandRlew(carmackExpandedObjects, rlewTag);
 
+      for (int i = 0; i < flatObjectGrid.length; i++) {
+        int id = flatObjectGrid[i];
+
+        // Handle the 'secret' pushwalls (Logic check)
+        if (id == MapObject.pushwallTrigger) {
+          // In Wolf3D, ID 98 means the wall at this same index in Plane 0 is pushable.
+          // You might want to mark this in your engine state.
+        }
+
+        // Filter out invalid IDs for Shareware to prevent crashes
+        if (isShareware && !MapObject.isSharewareCompatible(id)) {
+          flatObjectGrid[i] = 0; // Turn unknown objects into empty space
+        }
+      }
+
       Matrix<int> wallGrid = [];
       Matrix<int> objectGrid = []; // NEW