texturemanager.h

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#ifndef ION_GFX_TEXTUREMANAGER_H_
#define ION_GFX_TEXTUREMANAGER_H_

#include <set>
#include <vector>

#include "base/macros.h"
#include "ion/base/allocatable.h"
#include "ion/math/range.h"

namespace ion {
namespace gfx {

class TextureManager : public base::Allocatable {
 public:
  typedef const void* TextureType;

  explicit TextureManager(int max_texture_units);
  ~TextureManager() override;

  int GetUnit(TextureType texture, int current_unit);

  int GetBackIndex() const { return back_; }
  int GetFrontIndex() const { return front_; }
  TextureType GetTexture(int unit) const;

  void SetUnitRange(const math::Range1i& units);

 private:
  static const int kEnd;

  struct Item {
    TextureType texture;
    int prev;
    int next;
  };

  void Touch(int unit);

  std::vector<Item> items_;
  int back_;
  int front_;

  DISALLOW_IMPLICIT_CONSTRUCTORS(TextureManager);
};

}  // namespace gfx
}  // namespace ion

#endif  // ION_GFX_TEXTUREMANAGER_H_