genesis-3d_engine/Engine/graphicsystem/Light/Light.h

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

http://www.genesis-3d.com.cn

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THE SOFTWARE.
****************************************************************************/
#ifndef _LIGHT_H_
#define _LIGHT_H_

#include "base/GraphicObject.h"
#include "math/quaternion.h"
#include "Camera/Camera.h"
#include "graphicsystem/Vision/RenderScene.h"

namespace Graphic
{
	using namespace Math;
	class Camera;
	class RenderToTexture;
	class Light;

	class LightListener
	{
	public:
		virtual ~LightListener(){};
		virtual void RenderShadowMapBegin(Light* sender) = 0;
	};

	class Light : public GraphicObject
	{
		__DeclareSubClass(Light,GraphicObject)
	public:
		enum LightType
		{
			eInvailidLightType = -1,
			eSunLight,
			eDirectionalLight,
			ePointLight,
			eSpotLight,			

			eLightTypeCount
		};

		enum LightMapType
		{
			eLM_NoBaked, // 
			eLM_Flexible, // 
			eLM_JustForBaked //
		};

		typedef GPtr<Camera> ShadowMapCamera;
		typedef Util::Array<ShadowMapCamera> ShadowMapCameraList;
		Light();
		virtual ~Light();

		void RenderShadowMapBegin();

		void SetupSunlightShadow(int shadowMapSize = 1024, int splitCount = 4);

		void DiscardShadow();

		void _SetupMainLightFrustum(GPtr<Camera>& cam);

		void Discard();

		virtual void SetTransform(const matrix44& trans);

		float4 GetLightDir() const;

		float4 GetLightPos() const;

		void SetEnabled( bool bEnable);
		bool IsEnabled();

		void SetLightColor(const float4& color);
		const float4& GetLightColor(bool bCheckLightState = true) const;

		void SetLightIntensity(const float& intensity);
		const float& GetLightIntensity() const;

		void SetLightType(const LightType& ltype);
		const LightType& GetLightType() const;

		/// set Lightmapping
		void SetLightmapType (LightMapType mode);
		/// get Lightmapping
		const Light::LightMapType& GetLightmapType() const;

		/// Set LightmapModeShadow
		void SetLightmapModeShadow(bool bLightmapShadow);
		/// Get LightmapModeShadow
		bool GetLightmapModeShadow() const;

		void SetLightRange(const float& range);
		const float& GetLightRange() const;
		//		void UpdateLightRange();

		void SetConstantAttenuation(const float& ca);
		const float& GetConstantAttenuation() const;

		void SetLinearAttenuation(const float& la);
		const float& GetLinearAttenuation() const;

		void SetFalloff(const float& falloff);
		const float& GetFalloff() const;

		void SetQuadraticAttenuation(const float& qa);
		const float& GetQuadraticAttenuation() const;

		void SetAttenuations(float constAtt, float linearAtt, float quadAtt);

		void SetCosHalfOuterAngle(const float& cosHalfOuterAngle);
		const float& GetCosHalfOuterAngle() const;

		void SetCosHalfInnerAngle(const float& cosHalfInnerAngle);
		const float& GetCosHalfInnerAngle() const;

		const float& GetInvCosConeDifference() const;

		void SetExponent(const float& expo);
		const float& GetExponent() const;

		const ShadowMapCameraList& GetShadowMapCameraList() const;
		// check the state of light
		void SetEnableShadow(bool enable);
		const bool IsEnableShadow() const;
		const SizeT GetRealSplitCount() const;
		const int GetRealShadowMapSize() const;

		void CopyFrom(const Light& src);

		void SetOwner(void* owner);

		void* GetOwner() const;

		void SetListener(LightListener* listener);
		LightListener* GetListener() const;

		void Attach(RenderScene* resc);
		void Detach();
		bool Attached() const;

		RenderScene* GetRenderScene() const;

		void ResetShadowMap(const SizeT nSplit);

	protected:		

		//void* m_owner;
		LightListener* m_listener;
		RenderScene* m_renderScene;
		ShadowMapCameraList m_shadowMapCameras;
		Util::Array<GPtr<RenderToTexture> > m_dummyShadowRTs;

		float4 m_lightColor;
		float m_lightIntensity;

		//spot/point light spec start
		float m_range;
		float m_constantAttenuation;
		float m_linearAttenuation;
		float m_quadraticAttenuation;
		//spot light spec
		float m_cosHalfOuterAngle;
		float m_cosHalfInnerAngle;
		float m_invCosConeDifference;
		float m_spotExponent;
		//spot/point light spec end

		// Falloff
		float m_falloff;

		LightType m_lightType;
		//used for shadowmap
		bool m_enableShadow;
		int m_RealShadowmapSize;

		//used for lightmap
		LightMapType m_Lightmapping;
		bool m_LightmapShadow;
		bool m_bEnable;

		static const SizeT S_C_CASCADEDCAMERANUM = 4;
	};		
	inline const SizeT Light::GetRealSplitCount() const
	{
		return m_shadowMapCameras.Size();
	}

	inline const int Light::GetRealShadowMapSize() const
	{
		return m_RealShadowmapSize;
	}

	inline float4
		Light::GetLightPos() const
	{
		return m_transform.get_position();
	}

	inline void 
		Light::SetEnabled( bool bEnable)
	{
		m_bEnable = bEnable;
	}

	inline bool 
		Light::IsEnabled( )
	{
		return m_bEnable;
	}

	inline void
		Light::SetLightColor(const float4& color)
	{
		m_lightColor = color;
	}

	inline const float4&
		Light::GetLightColor(bool bCheckLightState) const
	{
		if (bCheckLightState && (!m_bEnable) )
		{
			static Math::float4 blackColor(0.0f, 0.0f, 0.0f, 1.0f);

			return blackColor;
		}
		else
		{
			return m_lightColor;
		}
	}

	inline void
		Light::SetLightIntensity(const float& intensity)
	{
		m_lightIntensity = intensity;
	}

	inline const float&
		Light::GetLightIntensity() const
	{
		return m_lightIntensity;
	}

	inline const Light::LightType& 
		Light::GetLightType() const
	{
		return m_lightType;
	}

	inline void 
		Light::SetLightRange(const float& range)
	{
		m_range = range;
	}

	inline const float& 
		Light::GetLightRange() const
	{
		return m_range;
	}

	inline void
		Light::SetConstantAttenuation(const float& ca)
	{
		m_constantAttenuation = ca;
	}

	inline const float&
		Light::GetConstantAttenuation() const
	{
		return m_constantAttenuation;	
	}

	inline void
		Light::SetLinearAttenuation(const float& la)
	{
		m_linearAttenuation = la;
	}

	inline const float&
		Light::GetLinearAttenuation() const
	{
		return m_linearAttenuation;	
	}

	inline void
		Light::SetQuadraticAttenuation(const float& qa)
	{
		m_quadraticAttenuation = qa;
	}

	inline const float&
		Light::GetQuadraticAttenuation() const
	{
		return m_quadraticAttenuation;	
	}

	inline void
		Light::SetCosHalfOuterAngle(const float& cosHalfOuterAngle)
	{
		m_cosHalfOuterAngle = cosHalfOuterAngle;
		m_invCosConeDifference = 1.0f / (m_cosHalfInnerAngle - m_cosHalfOuterAngle);
	}

	inline const float&
		Light::GetCosHalfOuterAngle() const
	{
		return m_cosHalfOuterAngle;	
	}

	inline void
		Light::SetCosHalfInnerAngle(const float& cosHalfInnerAngle)
	{
		m_cosHalfInnerAngle = cosHalfInnerAngle;
		m_invCosConeDifference = 1.0f / (m_cosHalfInnerAngle - m_cosHalfOuterAngle);
	}

	inline const float&
		Light::GetCosHalfInnerAngle() const
	{
		return m_cosHalfInnerAngle;
	}

	inline const float&
		Light::GetInvCosConeDifference() const
	{
		return m_invCosConeDifference;
	}

	inline void
		Light::SetExponent(const float& expo)
	{
		m_spotExponent = expo;
	}

	inline const float&
		Light::GetExponent() const
	{
		return m_spotExponent;	
	}

	inline void
		Light::SetFalloff(const float& falloff)
	{
		m_falloff = falloff;
	}

	inline const float& 
		Light::GetFalloff() const
	{
		return m_falloff;
	}

	inline const Util::Array< GPtr<Camera> >& 
		Light::GetShadowMapCameraList() const
	{
		return m_shadowMapCameras;
	}

	inline const bool 
		Light::IsEnableShadow() const
	{
		return m_enableShadow;
	}
	inline RenderScene*
		Light::GetRenderScene() const
	{
		return m_renderScene;
	}

	inline void 
		Light::SetListener(LightListener* listener)
	{
		m_listener = listener;
	}
	inline LightListener*
		Light::GetListener() const
	{
		return m_listener;
	}

	inline bool 
		Light::Attached() const
	{
		return (m_renderScene != NULL);
	}
}
#endif//_LIGHT_H_