TileLayer.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2022 Julien Bernard
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */
#ifndef GF_TILE_LAYER_H
#define GF_TILE_LAYER_H
 
#include <memory>
#include <vector>
 
#include "Array2D.h"
#include "Cells.h"
#include "CellTypes.h"
#include "Flags.h"
#include "GraphicsApi.h"
#include "Tileset.h"
#include "Transformable.h"
#include "VertexArray.h"
#include "VertexBuffer.h"
 
namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif
 
  class Texture;
 
  class GF_GRAPHICS_API TileLayer : public Transformable {
  public:
    static constexpr int NoTile = -1;
 
    TileLayer();
 
    static TileLayer createOrthogonal(Vector2i layerSize, Vector2i tileSize);
 
    static TileLayer createStaggered(Vector2i layerSize, Vector2i tileSize, CellAxis axis, CellIndex index);
 
    static TileLayer createHexagonal(Vector2i layerSize, Vector2i tileSize, int sideLength, CellAxis axis, CellIndex index);
 
    Vector2i getMapSize() const {
      return m_tiles.getSize();
    }
 
    std::size_t createTilesetId();
 
    Tileset& getTileset(std::size_t id);
 
    const Tileset& getTileset(std::size_t id) const;
 
 
    void setTile(Vector2i position, std::size_t tileset, int tile, Flags<Flip> flip = None);
 
    int getTile(Vector2i position) const;
 
    Flags<Flip> getFlip(Vector2i position) const;
 
    std::size_t getTileTileset(Vector2i position) const;
 
    void clear();
 
    RectF getLocalBounds() const;
 
    void setAnchor(Anchor anchor);
 
    VertexBuffer commitGeometry() const;
 
    virtual void draw(RenderTarget& target, const RenderStates& states) override;
 
  private:
    TileLayer(Vector2i layerSize, CellOrientation orientation, std::unique_ptr<Cells> properties);
 
  private:
    struct Cell {
      std::size_t tileset = std::size_t(-1);
      int tile = NoTile;
      Flags<Flip> flip = gf::None;
    };
 
    struct Sheet {
      Tileset tileset;
      VertexArray vertices;
    };
 
  private:
    void fillVertexArray(std::vector<Sheet>& sheets, RectI rect) const;
    void updateGeometry();
    RectI computeOffsets() const;
 
  private:
    CellOrientation m_orientation;
    std::unique_ptr<Cells> m_properties;
 
    Vector2i m_layerSize;
 
    std::vector<Sheet> m_sheets;
    RectI m_rect;
 
    Array2D<Cell> m_tiles;
  };
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}
 
#endif // GF_TILE_LAYER_H