osgEarthTerrainSourceTracker.h

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/*******************************************************************************
** Copyright (c) 2010 MAK Technologies, Inc.
** All rights reserved.
*******************************************************************************/


#pragma once

#include <vantageTerrainImplementation/terrainSourceTracker.h>
#include <vantageTerrainImplementation/pageInVisitor.h>
#include <vantageTerrainImplementation/bulletUtil.h>
#include <vantageTerrainImplementation/vantageTerrainImplementationDefines.h>
#include <vantageTerrainImplementation/vantageTerrainImplementationUtil.h>

#include <vrfutil/vertexList.h>

//Mak Terrain Toolkit includes
#include <geometry/sphere.h>

#include <vlutil/vlSmartPointers.h>

#include <osgTerrain/TerrainTile>
#include <osgEarth/Profile>
#include <osgEarth/TileKey>

#include <string>
#include <list>

class DtPageInTilesCommand;
class DtPageOutTilesCommand;

typedef std::list< osgEarth::TileKey > DtTileKeyList;

class DT_DLL_vantageTerrainImplementation DtOsgEarthTerrainSourceTracker : public DtTerrainSourceTracker
{
public:
   enum Direction
   {
      NORTH = 0,
      SOUTH,
      EAST,
      WEST
   };

   DtOsgEarthTerrainSourceTracker(DtPagerCommandQueue* commandQueue, 
      const osgEarth::Profile* profile, unsigned int lod);

   virtual ~DtOsgEarthTerrainSourceTracker();

   virtual void addPagedInTile(const osgEarth::TileKey tileKey, const DtTileData& tileData);

   virtual void removePagedInTile(const osgEarth::TileKey tileKey);

   virtual bool dataAvailable(DtPagingMetaDataPtr metaData, 
      DtTerrainPagingGeometryPtr geometry);

   virtual void pageInData(DtPagingMetaDataPtr metaData,
      DtTerrainPagingGeometryPtr geometry);

   virtual DtTerrainIntersectIDType findOldestPagedData(unsigned int& numTrianglesOut);

   virtual void pageOutOldestData(const int priority);

   virtual void drawDebugInfo(btIDebugDraw* debugDrawer);

   virtual bool canPageOutData(DtTerrainIntersectIDType intersectId);

   virtual void convertDirectionToOffset(Direction, int& x, int& y) const;

protected:

   virtual DtPageInTilesCommand* createPageInTilesCommand(
      DtPagingMetaDataPtr metaData);

   virtual DtPageOutTilesCommand* createPageOutTilesCommand(
      DtPagingMetaDataPtr metaData);

   virtual void tilesInGeometry(DtTerrainPagingGeometryPtr geometry, 
      DtTileKeyList& tilesOut) const;

   virtual void pageOutData(const DtTileKeyList tilesToRemove, const int priority);

   virtual void tilesUnderChord(const DtChord& chord, 
      DtTileKeyList& tilesOut) const;

   virtual void tilesInSphere(const DtSphere& sphere,
      DtTileKeyList& tilesOut) const;

   virtual void tilesInShape(const DtLocalVertexList&  vertices,
      DtTileKeyList& tilesOut) const;

   virtual bool dataAvailable(const DtTileKeyList& keyList, 
      DtTerrainIntersectIDType intersectId = 0);

   virtual void drawTile(btIDebugDraw* debugDrawer, const DtTileData& tileData);

protected:
    
   Direction nextTileDirection(
      Direction latDirection,
      Direction lonDirection, 
      bool isMostlyEastWest, double slope,
      double startX, double startY, double edgeX, double edgeY) const;

   DtPagedTilesMap myPagedInTiles;

   std::set<osgEarth::TileKey> myTilesPendingRemoval;

   osg::ref_ptr<const osgEarth::Profile> myProfile;

   unsigned int myLOD;

   osgEarth::TileKey* myOldestPagedObject;

   bool myRecomputeOldestPagedObject;
};