genesis-3d_engine/Engine/app/terrainfeature/components/TerrainNodeFrameTraverser.h

/****************************************************************************
Copyright (c) 2011-2013,WebJet Business Division,CYOU

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#ifndef __TerrainNodeFrameTraverser_H__
#define __TerrainNodeFrameTraverser_H__
#include "terrainfeature/components/TerrainNodeTraverser.h"
#include "graphicsystem/Camera/Camera.h"


namespace App
{
	class TerrainRenderComponent;

	/// Set Node's draw mode
	class MarkNodeDrawModeTraverser: public TerrainNodeTraverser
	{
	public:
		MarkNodeDrawModeTraverser(NodeDrawMode vis, TerrainNodeTraverser::TraversalMode m = TerrainNodeTraverser::TRAVERSE_CHILDREN );

		virtual ~MarkNodeDrawModeTraverser(){

		}

		virtual void Apply(TerrainNode& node);
	protected:
		NodeDrawMode m_drawMode;
	};

	/// according camera position, calculate terrain nodes LOD status(DrawMode)
	class UpdateTerrainLodLevelTraverser: public TerrainNodeTraverser
	{
	public:
		UpdateTerrainLodLevelTraverser(float cameraFactor,	//	camera
			const Math::vector& cameraLocalPos,	//	camera position in terrain coordinate
			float SquareNodeDistance);	//	distance of use or not use baseMap

		virtual ~UpdateTerrainLodLevelTraverser(){

		}

		virtual void Apply(TerrainNode& node);
	protected:
		float				m_CameraFactor;
		Math::vector		m_CameraLocalPos;
		float				m_SquareNodeDistance;
		int					m_LodMaxLevel;

		MarkNodeDrawModeTraverser m_MarkLodParentDrawedTraverser;
	};

	//ergodic tree, make sure every adjoining node's level difference not bigger than 1. for convenience suture edge
	class LevelupNeighborLODTraverser: public TerrainNodeTraverser
	{
	public:
		LevelupNeighborLODTraverser(	const Math::vector& cameraLocalPos,	//	camera position in terrain coordinate
										float squareNodeDistance);			//	distance of use or not use baseMap
		virtual ~LevelupNeighborLODTraverser(){

		}

		virtual void		Apply(TerrainNode& node);
		void				LevelUpNode(TerrainNode& node);

	protected:
		Math::vector		m_CameraLocalPos;
		float				m_SquareNodeDistance;
		MarkNodeDrawModeTraverser m_MarkLodParentDrawedTraverser;
	};

	//ergodic every visible LOD node, if edge changed, rebuild PrimitiveHandle
	class BuildEdgeMaskTraverser: public TerrainNodeTraverser
	{
	public:
		BuildEdgeMaskTraverser();
		virtual ~BuildEdgeMaskTraverser(){

		}
		virtual void Apply(TerrainNode& node);
	};

	//ergodic every visible LOD node, rebuild PrimitiveHandle
	class BuildPrimitiveTraverser: public TerrainNodeTraverser
	{
	public:
		BuildPrimitiveTraverser(const GPtr<Terrain::TerrainDataSource>& terrainDataSource);
		virtual ~BuildPrimitiveTraverser(){

		}

		virtual void Apply(TerrainNode& node);

	protected:
		GPtr<Terrain::TerrainDataSource> m_TerrainDataSource;
	};

	/** ergodic every, remove unused GraphicOject, add useful GraphicObject
	*                                                                     
	*/
	class BuildGraphicObjectTraverser: public TerrainNodeTraverser
	{
	public:
		BuildGraphicObjectTraverser(TerrainRenderComponent* comObj);
		virtual ~BuildGraphicObjectTraverser(){

		}
		virtual void Apply(TerrainNode& node);
	protected:
		TerrainRenderComponent* m_TerrainComponent;
	};

	/// set node and child node need rebuild PrimitiveHandle
	class RequestBuildNodeAndParentTraverser: public TerrainNodeTraverser
	{
	public:
		RequestBuildNodeAndParentTraverser(const GPtr<Terrain::TerrainDataSource>& terrainDataSource);
		virtual ~RequestBuildNodeAndParentTraverser(){

		}
		virtual void Apply(TerrainNode& node); 
	protected:
		GPtr<Terrain::TerrainDataSource> m_TerrainDataSource;
	};
}

#endif // __TerrainNodeFrameTraverser_H__