Use wall + floor assets from Pixel dungeon

src/engine/world/generator.ts

@@ -19,7 +19,7 @@ interface Room {
 export function generateWorld(level: number, runState: RunState): { world: World; playerId: EntityId } {
   const width = GAME_CONFIG.map.width;
   const height = GAME_CONFIG.map.height;
-  const tiles: Tile[] = new Array(width * height).fill(1); // Start with all walls
+  const tiles: Tile[] = new Array(width * height).fill(GAME_CONFIG.terrain.wall); // Start with all walls
 
   const random = seededRandom(level * 12345);
   
@@ -52,6 +52,8 @@ export function generateWorld(level: number, runState: RunState): { world: World
 
   placeEnemies(level, rooms, actors, random);
 
+  decorate(width, height, tiles, random, exit);
+
   return { world: { width, height, tiles, actors, exit }, playerId };
 }
 
@@ -99,7 +101,7 @@ function doesOverlap(newRoom: Room, rooms: Room[]): boolean {
 function carveRoom(room: Room, tiles: Tile[], world: any): void {
   for (let x = room.x; x < room.x + room.width; x++) {
     for (let y = room.y; y < room.y + room.height; y++) {
-      tiles[idx(world, x, y)] = 0;
+      tiles[idx(world, x, y)] = GAME_CONFIG.terrain.empty;
     }
   }
 }
@@ -113,22 +115,95 @@ function carveCorridor(room1: Room, room2: Room, tiles: Tile[], world: any, rand
   if (random() < 0.5) {
     // Horizontal then vertical
     for (let x = Math.min(x1, x2); x <= Math.max(x1, x2); x++) {
-      tiles[idx(world, x, y1)] = 0;
+      tiles[idx(world, x, y1)] = GAME_CONFIG.terrain.empty;
     }
     for (let y = Math.min(y1, y2); y <= Math.max(y1, y2); y++) {
-      tiles[idx(world, x2, y)] = 0;
+      tiles[idx(world, x2, y)] = GAME_CONFIG.terrain.empty;
     }
   } else {
     // Vertical then horizontal
     for (let y = Math.min(y1, y2); y <= Math.max(y1, y2); y++) {
-      tiles[idx(world, x1, y)] = 0;
+      tiles[idx(world, x1, y)] = GAME_CONFIG.terrain.empty;
     }
     for (let x = Math.min(x1, x2); x <= Math.max(x1, x2); x++) {
-      tiles[idx(world, x, y2)] = 0;
+      tiles[idx(world, x, y2)] = GAME_CONFIG.terrain.empty;
     }
   }
 }
 
+function decorate(width: number, height: number, tiles: Tile[], random: () => number, exit: Vec2): void {
+  const world = { width, height };
+
+  // Set exit tile
+  tiles[idx(world as any, exit.x, exit.y)] = GAME_CONFIG.terrain.exit;
+
+  // Add water patches (similar to PD Sewers)
+  const waterMask = generatePatch(width, height, 0.45, 5, random);
+  for (let i = 0; i < tiles.length; i++) {
+    if (tiles[i] === GAME_CONFIG.terrain.empty && waterMask[i]) {
+      tiles[i] = GAME_CONFIG.terrain.water;
+    }
+  }
+
+  // Wall decorations
+  for (let y = 0; y < height - 1; y++) {
+    for (let x = 0; x < width; x++) {
+      const i = idx(world as any, x, y);
+      const nextY = idx(world as any, x, y + 1);
+
+      if (tiles[i] === GAME_CONFIG.terrain.wall && 
+          tiles[nextY] === GAME_CONFIG.terrain.water &&
+          random() < 0.25) {
+        tiles[i] = GAME_CONFIG.terrain.wallDeco;
+      }
+    }
+  }
+
+  // Floor decorations (moss)
+  for (let y = 1; y < height - 1; y++) {
+    for (let x = 1; x < width - 1; x++) {
+      const i = idx(world as any, x, y);
+      if (tiles[i] === GAME_CONFIG.terrain.empty) {
+        let wallCount = 0;
+        if (tiles[idx(world as any, x + 1, y)] === GAME_CONFIG.terrain.wall) wallCount++;
+        if (tiles[idx(world as any, x - 1, y)] === GAME_CONFIG.terrain.wall) wallCount++;
+        if (tiles[idx(world as any, x, y + 1)] === GAME_CONFIG.terrain.wall) wallCount++;
+        if (tiles[idx(world as any, x, y - 1)] === GAME_CONFIG.terrain.wall) wallCount++;
+
+        if (random() * 16 < wallCount * wallCount) {
+          tiles[i] = GAME_CONFIG.terrain.emptyDeco;
+        }
+      }
+    }
+  }
+}
+
+/**
+ * Simple cellular automata for generating patches of terrain
+ */
+function generatePatch(width: number, height: number, fillChance: number, iterations: number, random: () => number): boolean[] {
+  let map = new Array(width * height).fill(false).map(() => random() < fillChance);
+
+  for (let step = 0; step < iterations; step++) {
+    const nextMap = new Array(width * height).fill(false);
+    for (let y = 1; y < height - 1; y++) {
+      for (let x = 1; x < width - 1; x++) {
+        let neighbors = 0;
+        for (let dy = -1; dy <= 1; dy++) {
+          for (let dx = -1; dx <= 1; dx++) {
+            if (map[(y + dy) * width + (x + dx)]) neighbors++;
+          }
+        }
+        if (neighbors > 4) nextMap[y * width + x] = true;
+        else if (neighbors < 4) nextMap[y * width + x] = false;
+        else nextMap[y * width + x] = map[y * width + x];
+      }
+    }
+    map = nextMap;
+  }
+  return map;
+}
+
 function placeEnemies(level: number, rooms: Room[], actors: Map<EntityId, Actor>, random: () => number): void {
   let enemyId = 2;
   const numEnemies = GAME_CONFIG.enemy.baseCount + level * GAME_CONFIG.enemy.baseCountPerLevel + Math.floor(random() * GAME_CONFIG.enemy.randomBonus);