TileOcclusionRendererProxy.h

#pragma once
 
#include "Library.h"
#include "Tile.h"
 
#include <cstdint>
#include <unordered_map>
#include <vector>
 
namespace Cesium3DTilesSelection {
 
enum class CESIUM3DTILESSELECTION_API TileOcclusionState {
  OcclusionUnavailable,
 
  NotOccluded,
 
  Occluded
};
 
class CESIUM3DTILESSELECTION_API TileOcclusionRendererProxy {
public:
  virtual TileOcclusionState getOcclusionState() const = 0;
 
protected:
  friend class TileOcclusionRendererProxyPool;
  virtual void reset(const Tile* pTile) = 0;
 
private:
  bool _usedLastFrame = false;
  TileOcclusionRendererProxy* _pNext = nullptr;
};
 
class CESIUM3DTILESSELECTION_API TileOcclusionRendererProxyPool {
public:
  TileOcclusionRendererProxyPool(int32_t maximumPoolSize);
 
  virtual ~TileOcclusionRendererProxyPool();
 
  void destroyPool();
 
  const TileOcclusionRendererProxy*
  fetchOcclusionProxyForTile(const Tile& tile, int32_t currentFrame);
 
  void pruneOcclusionProxyMappings();
 
protected:
  virtual TileOcclusionRendererProxy* createProxy() = 0;
 
  virtual void destroyProxy(TileOcclusionRendererProxy* pProxy) = 0;
 
private:
  // Singly linked list representing the free proxies in the pool
  TileOcclusionRendererProxy* _pFreeProxiesHead;
  int32_t _currentSize;
  int32_t _maxSize;
  // The currently used proxies in the pool
  std::unordered_map<const Tile*, TileOcclusionRendererProxy*>
      _tileToOcclusionProxyMappings;
};
 
} // namespace Cesium3DTilesSelection