TileLayer.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2021 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 "Flags.h"
#include "GraphicsApi.h"
#include "MapCell.h"
#include "TileProperties.h"
#include "Tileset.h"
#include "TileTypes.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);

    static TileLayer createStaggered(Vector2i layerSize, MapCellAxis axis, MapCellIndex 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 setTileSize(Vector2i tileSize);

    Vector2i getTileSize() const {
      return m_tileSize;
    }

    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, TileOrientation orientation, std::unique_ptr<TileProperties> properties);

  private:
    struct Cell {
      std::size_t tileset = -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:
    TileOrientation m_orientation;
    std::unique_ptr<TileProperties> m_properties;

    Vector2i m_layerSize;
    Vector2i m_tileSize;

    std::vector<Sheet> m_sheets;
    RectI m_rect;

    Array2D<Cell> m_tiles;
  };

#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}

#endif // GF_TILE_LAYER_H