ClipmapDepthQuery.h

#pragma once
 
#include "ClipmapTerrainTypes.h"
 
#include "Rendering/IGraphicsDevice.h"
 
namespace Cogs
{
  struct ClipmapRenderer;
 
  struct ClipmapDepthQuery
  {
    ClipmapDepthQuery();
    ~ClipmapDepthQuery();
 
    void initialize(IGraphicsDevice * device, ClipmapRenderer * clipmapRenderer);
 
    void readBack();
 
    bool getPositions(const Vector2 * mousePositions, const Matrix & inverseViewProjection, const size_t numPositions, Vector4 * worldPos, bool * positionValid, int rayPickId);
 
    float getNearestTerrainSample(const Matrix & inverseProjection);
 
    float getNearestTerrainSample2(const Matrix & inverseProjection, const Matrix & viewMatrix);
 
  private:
    IGraphicsDevice * device;
    BufferHandle queryReadBackBuffer;
    ClipmapRenderer * clipmapRenderer;
    bool hasReadBack = false; //set to true when first readback is complete
 
    Vector4 prevViewPos;
    Matrix prevViewMatrix;
  };
}