private IEnumerable <TiledMapLayerModel> CreateTileLayerModels(TiledMap map, TiledMapTileLayer tileLayer)
{
var layerModels = new List <TiledMapLayerModel>();
var staticLayerBuilder = new TiledMapStaticLayerModelBuilder();
var animatedLayerBuilder = new TiledMapAnimatedLayerModelBuilder();
foreach (var tileset in map.Tilesets)
{
var firstGlobalIdentifier = map.GetTilesetFirstGlobalIdentifier(tileset);
var lastGlobalIdentifier = tileset.TileCount + firstGlobalIdentifier - 1;
var texture = tileset.Texture;
foreach (var tile in tileLayer.Tiles.Where(t => firstGlobalIdentifier <= t.GlobalIdentifier && t.GlobalIdentifier <= lastGlobalIdentifier))
{
var tileGid = tile.GlobalIdentifier;
var localTileIdentifier = tileGid - firstGlobalIdentifier;
var position = GetTilePosition(map, tile);
var tilesetColumns = tileset.Columns == 0 ? 1 : tileset.Columns; // fixes a problem (what problem exactly?)
var sourceRectangle = TiledMapHelper.GetTileSourceRectangle(localTileIdentifier, tileset.TileWidth, tileset.TileHeight, tilesetColumns, tileset.Margin, tileset.Spacing);
var flipFlags = tile.Flags;
// animated tiles
var tilesetTile = tileset.Tiles.FirstOrDefault(x => x.LocalTileIdentifier == localTileIdentifier);
if (tilesetTile is TiledMapTilesetAnimatedTile animatedTilesetTile)
{
animatedLayerBuilder.AddSprite(texture, position, sourceRectangle, flipFlags);
animatedLayerBuilder.AnimatedTilesetTiles.Add(animatedTilesetTile);
if (animatedLayerBuilder.IsFull)
{
layerModels.Add(animatedLayerBuilder.Build(_graphicsDevice, texture));
}
}
else
{
staticLayerBuilder.AddSprite(texture, position, sourceRectangle, flipFlags);
if (staticLayerBuilder.IsFull)
{
layerModels.Add(staticLayerBuilder.Build(_graphicsDevice, texture));
}
}
}
if (staticLayerBuilder.IsBuildable)
{
layerModels.Add(staticLayerBuilder.Build(_graphicsDevice, texture));
}
if (animatedLayerBuilder.IsBuildable)
{
layerModels.Add(animatedLayerBuilder.Build(_graphicsDevice, texture));
}
}
return(layerModels);
}
private static IEnumerable <TiledMapLayerModelContent> CreateTileLayerModels(TiledMapContent map, string layerName, IEnumerable <TiledMapTile> tiles)
{
// the code below builds the geometry (triangles) for every tile
// for every unique tileset used by a tile in a layer, we are going to end up with a different model (list of vertices and list of indices pair)
// we also could end up with more models if the map is very large
// regardless, each model is going to require one draw call to render at runtime
var modelsByTileset = new Dictionary <TiledMapTilesetContent, List <TiledMapLayerModelContent> >();
// loop through all the tiles in the proper render order, building the geometry for each tile
// by processing the tiles in the correct rendering order we ensure the geometry for the tiles will be rendered correctly later using the painter's algorithm
foreach (var tile in tiles)
{
// get the tileset for this tile
var tileGlobalIdentifier = tile.GlobalIdentifier;
var tileset = map.Tilesets.FirstOrDefault(x => x.ContainsGlobalIdentifier(tileGlobalIdentifier));
if (tileset == null)
{
throw new NullReferenceException(
$"Could not find tileset for global tile identifier '{tileGlobalIdentifier}'");
}
var localTileIdentifier = tileGlobalIdentifier - tileset.FirstGlobalIdentifier;
Debug.Assert(tileset != null);
// check if this tile is animated
var tilesetTile = tileset.Tiles.FirstOrDefault(x => x.LocalIdentifier == localTileIdentifier);
var isAnimatedTile = tilesetTile?.Frames != null && tilesetTile.Frames.Count > 0;
// check if we already have built a list of models for this tileset
TiledMapLayerModelContent model;
List <TiledMapLayerModelContent> models;
if (modelsByTileset.TryGetValue(tileset, out models))
{
// if we found the list of models for this tileset, try to use the last model added
// (assuming the the ones before the last are all full)
model = models.FindLast(x => x is TiledMapLayerAnimatedModelContent == isAnimatedTile);
// since it is possible that the correct type of model was not added yet we might have to create the correct model now
if (model == null)
{
model = isAnimatedTile
? new TiledMapLayerAnimatedModelContent(layerName, tileset)
: new TiledMapLayerModelContent(layerName, tileset);
models.Add(model);
}
}
else
{
// if we have not found the list of models for this tileset, we need to create the list and start a new model of the correct type
models = new List <TiledMapLayerModelContent>();
model = isAnimatedTile
? new TiledMapLayerAnimatedModelContent(layerName, tileset)
: new TiledMapLayerModelContent(layerName, tileset);
models.Add(model);
modelsByTileset.Add(tileset, models);
}
// check if the current model is full
if (model.Vertices.Count + TiledMapHelper.VerticesPerTile > TiledMapHelper.MaximumVerticesPerModel)
{
// if the current model is full, we need to start a new one
model = isAnimatedTile
? new TiledMapLayerAnimatedModelContent(layerName, tileset)
: new TiledMapLayerModelContent(layerName, tileset);
models.Add(model);
}
// if the tile is animated, record the index of animated tile for the tilset so we can get the correct texture coordinates at runtime
if (isAnimatedTile)
{
var animatedModel = (TiledMapLayerAnimatedModelContent)model;
animatedModel.AddAnimatedTile(tilesetTile);
}
// fixes a problem
if (tileset.Columns == 0)
{
tileset.Columns = 1;
}
// build the geometry for the tile
var position = GetTilePosition(map, tile);
var sourceRectangle = TiledMapHelper.GetTileSourceRectangle(localTileIdentifier, tileset.TileWidth,
tileset.TileHeight, tileset.Columns, tileset.Margin, tileset.Spacing);
var flipFlags = tile.Flags;
model.AddTileIndices();
model.AddTileVertices(position, sourceRectangle, flipFlags);
}
// for each tileset used in this layer
foreach (var keyValuePair in modelsByTileset)
{
var models = keyValuePair.Value;
// and for each model apart of a tileset
foreach (var model in models)
{
yield return(model);
}
}
}