genesis-3d_engine/Engine/graphicsystem/Camera/RenderPipeline/ActiveLight.h

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

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#ifndef _ACTIVELIGHT_H_
#define _ACTIVELIGHT_H_
#include "foundation/math/bbox.h"
#include "graphicsystem/base/DataCollection.h"
namespace Graphic
{

	struct Pyramid
	{
		enum 
		{ 
			PointCount = 5 
		};
		Math::point points[PointCount];
	};

	class Light;
	class Camera;
	class RenderObject;
	struct ActiveLightInfo 
	{
		Light* light;
		Math::bbox boundingBox;
	};
	typedef DataCollection<ActiveLightInfo> ActiveLightCollection;

	typedef DataCollection<const ActiveLightInfo*> TempLightBlock;
	class ActiveLightManager
	{
	public:
		ActiveLightManager();
		~ActiveLightManager();
		void CameraCull(Camera* camera);
		void Reset();
		const ActiveLightInfo* FindSunLight() const;
		const TempLightBlock& FindActiveAttLights(const RenderObject* obj, int max_count, bool& bUsedForLightmap) const;
		ActiveLightCollection& GetActiveLights();
		int GetActiveLightCount() const;
		int GetAttLightBeginIndex() const;
		int GetAttLightCount() const;
		int GetNotAttLightCount() const;

	private:
		void _setActiveDirectionallight(Light* light, ActiveLightInfo& alight);
		static bool _inLight( const RenderObject* renderObj, const Math::bbox& worldBox, const ActiveLightInfo& actLight);
		static void _buildPyramid(const Light& light, Pyramid& outPyramid);
		ActiveLightCollection mActiveLights;
		int mAttLightBeginIndex;//the first index of attenuation light.in default light list, no attenuation lights always at the front of list.  
		mutable TempLightBlock mTempLightBlock;
		mutable const RenderObject* mTempObj;
	};

	inline ActiveLightCollection& ActiveLightManager::GetActiveLights()
	{
		return mActiveLights;
	}

	inline int ActiveLightManager::GetActiveLightCount() const
	{
		return mActiveLights.Count();
	}

	inline int ActiveLightManager::GetAttLightBeginIndex() const
	{
		return mAttLightBeginIndex;
	}
	inline int ActiveLightManager::GetAttLightCount() const
	{
		return mActiveLights.Count() - mAttLightBeginIndex;
	}
	inline int ActiveLightManager::GetNotAttLightCount() const
	{
		return mAttLightBeginIndex;
	}

}
#endif //_ACTIVELIGHT_H_