private TileMatrix ReadTileMatrix(ContentReader input, int layerWidth, int layerHeight)
{
List <TileMapTile> tileCache = new List <TileMapTile>();
TileMatrix matrix = new TileMatrix(layerWidth, layerHeight);
for (int i = 0; i < layerWidth * layerHeight; i++)
{
int tileId = input.ReadInt32();
var tile = tileCache.FirstOrDefault(t => t.Id == tileId);
if (tile == null)
{
tile = new TileMapTile(tileId);
tileCache.Add(tile);
}
matrix.SetTile(i % layerWidth, i / layerWidth, tile);
}
return(matrix);
}