implement tilemap chunk generator

scripts/TileMapGenerator.gd

@@ -0,0 +1,57 @@
+class_name TileMapGenerator
+extends CanvasLayer
+
+# one tilemap is one chunk
+# map consists of many chunks
+# chunks are loaded to view when needed
+# chunks are deleted after they are no longer needed (in view)
+
+# This is done to speed up game loading and avoiding setting one large tilemap in one go
+# which is extremely slow in godot 4.0, 4096x4096 takes minutes to fill with set_cell() commands
+
+const CHUNK_SIZE = Vector2i(128,128)
+
+var map_tiles:Array[Array] = [[]]
+
+func start() -> void:
+	# Initialize the map tile array with enough chunks to cover the whole map
+	
+	var ms:int = Globals.map_size.y/CHUNK_SIZE.y
+	map_tiles.resize(2)
+	print("map tiles size y: ", map_tiles.size())
+	
+	for y in ms:
+		map_tiles[y].resize(2)
+		print("map tiles size x: ", map_tiles[y].size())		
+		for x in ms:	
+			map_tiles[y][x] = TileMap.new()			
+	
+func test_func():
+	self.set_chunk_tiles(Vector2i(1,0))
+	#self.map_tiles[0][1].visible()
+	print(map_tiles[0][1])
+	
+func clear_chunk_tiles(chunk_pos:Vector2i) -> void:
+	map_tiles[chunk_pos.y][chunk_pos.x].clear()
+
+func set_chunk_tiles(chunk_pos:Vector2i) -> void:
+	# Set an invidiual chunk's tiles based on map terrain data
+	
+	# Try to load the world tilemap where we place the tiles
+	if (map_tiles[chunk_pos.y][chunk_pos.x] == null):
+		var errmsg = Globals.ERROR_TILEMAP_NODE_MISSING
+		push_error(errmsg % str(chunk_pos))
+		#return false
+		
+	for y in CHUNK_SIZE.y:
+		for x in CHUNK_SIZE.x:
+			var tile_data: Array = Globals.map_tile_data[chunk_pos.y*CHUNK_SIZE.y][chunk_pos.x*CHUNK_SIZE.x]
+			
+			# layer | tile coords at tilemap | tilemap id | coords of the tile at tileset | alternative tile
+			map_tiles[chunk_pos.y][chunk_pos.x].set_cell(
+				Globals.LAYER_TERRAIN,
+				Vector2i(x, y),
+				2,
+				tile_data[0],
+				tile_data[1]
+			)