///////////////////////////////////////////////////////////////////////  
//	CLensFlare Class
//
//	(c) 2003 IDV, Inc.
//
//	*** INTERACTIVE DATA VISUALIZATION (IDV) PROPRIETARY INFORMATION ***
//
//	This software is supplied under the terms of a license agreement or
//	nondisclosure agreement with Interactive Data Visualization and may
//	not be copied or disclosed except in accordance with the terms of
//	that agreement.
//
//      Copyright (c) 2001-2003 IDV, Inc.
//      All Rights Reserved.
//
//		IDV, Inc.
//		1233 Washington St. Suite 610
//		Columbia, SC 29201
//		Voice: (803) 799-1699
//		Fax:   (803) 931-0320
//		Web:   http://www.idvinc.com
//


///////////////////////////////////////////////////////////////////////  
//	Preprocessor

#pragma once

#include "GrpImageInstance.h"
#include "GrpScreen.h"

#include <float.h>
#include <string>
#include <vector>


///////////////////////////////////////////////////////////////////////  
//	Constants

const   float	c_fHalfMaxBright = 0.45f;
const   float	c_fDistanceScale = 1.0f;
const   int     c_nDepthTestDimension = 15;


///////////////////////////////////////////////////////////////////////  
//	CFlare

class CFlare 
{
public:
	void Draw(float fBrightScale, int nWidth, int nHeight, int nX, int nY);
	void Init(std::string strPath);
	
	CFlare();
	virtual ~CFlare();
	
private:
	struct SFlarePiece
	{
		SFlarePiece() :
	m_fPosition(0.0f),
		m_fWidth(0.0f),
		m_pColor(NULL)
	{
	}
	CGraphicImageInstance m_imageInstance;
	float	m_fPosition;	// -1.0 = light location, 0.0 = center, 1.0 = far end of flare
	float	m_fWidth;		// height = width
	float *	m_pColor;
	};
	
	std::vector<SFlarePiece *> m_vFlares;
};

///////////////////////////////////////////////////////////////////////  
//	CLensFlare
class CLensFlare : public CScreen
{
public:
	CLensFlare();
	virtual ~CLensFlare();
	
	void			Compute(const D3DXVECTOR3 & c_rv3LightDirection); // D3DTS_VIEW·Î ºÎÅÍ Ä«¸Þ¶ó ¹æÇâÀ» ¾ò¾î¿À¹Ç·Î, Ä«¸Þ¶ó ¼³Á¤ µÚ¿¡ ÇØ¾ß ÇÔ.

	void			DrawBeforeFlare();
	void			DrawAfterFlare();
	void			DrawFlare();
	
	void			SetMainFlare(std::string strSunFile, float fSunSize);
	void			Initialize(std::string strPath);
	
	void            SetFlareLocation(double dX, double dY);
	
	void            SetVisible(bool bState)		{ m_bFlareVisible = bState; }
	bool			IsVisible()					{ return m_bFlareVisible; }
	
	void            SetBrightnesses(float fBeforeBright, float fAfterBright);
	
	void            ReadControlPixels();
	void            AdjustBrightness();
	
	void			CharacterizeFlare(bool bEnabled, bool bShowMainFlare, float fMaxBrightness, const D3DXCOLOR & c_rColor);
	
protected:
	float			Interpolate(float fStart, float fEnd, float fPercent);

private:
	float	        m_afFlarePos[2], m_afFlareWinPos[2];
	float	        m_fBeforeBright, m_fAfterBright;
	bool        	m_bFlareVisible, m_bDrawFlare, m_bDrawBrightScreen;
	float			m_fSunSize;
	CFlare			m_cFlare;
	float *			m_pControlPixels;
	float *			m_pTestPixels;
	bool			m_bEnabled;
	bool			m_bShowMainFlare;
	float			m_fMaxBrightness;
	float			m_afColor[4];
	
	CGraphicImageInstance m_SunFlareImageInstance;
	
	void            ReadDepthPixels(float * pPixels);
	void			ClampBrightness();
};