ClipmapQueryHandler.h

#pragma once
 
#include <vector>
#include <mutex>
 
#include "RenderContext.h"
 
namespace Cogs
{
  class ClipmapLevel;
 
  template<typename T>
  struct TerrainQueryData
  {
    void * userData;
 
    std::vector<double> positions;
    std::vector<T> results;
 
    int resultStride;
 
    int targetLevel;
    int resultLevel;
 
    std::vector<int> levels;
    std::vector<int> requestedLevel;
 
    std::vector<ClipmapLevel> * inputLevels;
 
    WorldOptions worldOptions;
 
    int queryLayer;
    bool complete;
 
    TerrainQueryCallback * callback;
  };
 
  typedef TerrainQueryData<double> ElevationQueryData;
  typedef TerrainQueryData<unsigned char> ColorQueryData;
 
  struct RasterTileData;
 
  class ClipmapQueryHandler
  {
  public:
    ClipmapQueryHandler() = default;
 
    void initialize(std::vector<ClipmapLevel> * terrainLevels, std::vector<std::vector<ClipmapLevel>> * imagery);
 
    void postInitialize();
 
    void postRequest(TerrainQuery * query, TerrainQueryCallback callback, const WorldOptions & worldOptions);
 
    void processQueries();
 
    template<typename DataType>
    void processQueries_T(std::vector<TerrainQueryData<DataType>> & queries);
    
    template<typename DataType>
    bool readData(const RasterTileData * tileData, const int x, const int y, const int width, DataType * result);
 
    std::vector<ElevationQueryData> elevationQueries;
    std::vector<ColorQueryData> colorQueries;
 
    std::vector<ClipmapLevel> * terrainLevels = nullptr;
    std::vector<std::vector<ClipmapLevel>> * imagery = nullptr;
 
    std::mutex mutex;
 
  private:
    bool allowToProcessQueries = false;
  };
}