//-----------------------------------------------
// Synapse Gaming - Lighting System
// Copyright © Synapse Gaming 2003
// Written by John Kabus
//-----------------------------------------------
#ifndef _SGLIGHTINGMODEL_H_
#define _SGLIGHTINGMODEL_H_

#ifndef _MMATH_H_
#include "math/mMath.h"
#endif
#ifndef _COLOR_H_
#include "core/color.h"
#endif
#ifndef _TVECTOR_H_
#include "core/tVector.h"
#endif
#ifndef _DATACHUNKER_H_
#include "core/dataChunker.h"
#endif
#include "console/console.h"
#include "console/consoleTypes.h"
#include "lightingSystem/sgLightManager.h"
#include "core/stringTable.h"
#include "core/tVector.h"

#define SG_LIGHTINGMODEL_NAME	"SG - %s (Lighting Pack)"

#define SG_DYNAMICLIGHTING_TYPE2

class sgLightingModel
{
protected:
	bool sgStateSet;
	bool sgStateInitLM;
	LightInfo *sgLight;
public:
	char sgLightingModelName[64];
	sgLightingModel();
	void sgRegisterLightingModel();
	virtual void sgSetState(LightInfo *light)
	{
		AssertFatal((sgStateSet == false), "sgLightingModel: State not properly reset.");
		sgStateSet = true;
		sgStateInitLM = false;
		sgLight = light;
	}
	virtual void sgLightingGL(S32 gllight)
	{
		AssertFatal((sgStateSet == true), "sgLightingModel: State not properly set.");
	}
	virtual void sgInitStateLM()
	{
		AssertFatal((sgStateSet == true), "sgLightingModel: State not properly set.");
		sgStateInitLM = true;
	}
	virtual void sgLightingLM(const Point3F &point, VectorF normal, ColorF &diffuse, ColorF &ambient, Point3F &lightingnormal)
	{
		AssertFatal((sgStateInitLM == true), "sgLightingModel: State not properly init.");
	}
	virtual void sgResetState()
	{
		sgStateSet = false;
		sgStateInitLM = false;
		sgLight = NULL;
	}
	virtual F32 sgScoreLight(LightInfo *light, const SphereF &sphere)
	{
		AssertFatal((sgStateSet == true), "sgLightingModel: State not properly set.");
		return 0.0f;
	}
	virtual bool sgCanIlluminate(const Box3F &box) = 0;
	virtual F32 sgGetMaxRadius(bool speedoverquality=false, bool glstyle=false) = 0;
	virtual Point3F sgGetModelInfo() = 0;
};

class sgLightingModelGLBase : public sgLightingModel
{
protected:
	F32 sgConstantAttenuation;
	F32 sgLinearAttenuation;
	F32 sgQuadraticAttenuation;
	F32 spotanglecos;
	F32 spotamountinner;
	F32 spotamountouter;
    Point4F sgLightParamDiffuse;
    Point4F sgLightParamAmbient;
    Point4F sgLightParamPosition;
    Point4F sgLightParamDirection;
public:
	virtual void sgSetState(LightInfo *light);
	virtual void sgLightingGL(S32 gllight);
	virtual void sgInitStateLM();
	virtual void sgLightingLM(const Point3F &point, VectorF normal, ColorF &diffuse, ColorF &ambient, Point3F &lightingnormal);
	virtual F32 sgScoreLight(LightInfo *light, const SphereF &sphere);
	virtual bool sgCanIlluminate(const Box3F &box);
	virtual F32 sgGetMaxRadius(bool speedoverquality=false, bool glstyle=false);
	virtual Point3F sgGetModelInfo()
	{
		return Point3F(sgConstantAttenuation,
			sgLinearAttenuation, sgQuadraticAttenuation);
	}
};

class sgLightingModelAdvanced : public sgLightingModelGLBase
{
protected:
	F32 maxlightdistancesquared;
public:
	sgLightingModelAdvanced()
	{
		dSprintf(sgLightingModelName, sizeof(sgLightingModelName),
			SG_LIGHTINGMODEL_NAME, "Original Advanced");
	}
	virtual void sgSetState(LightInfo *light);
	virtual void sgInitStateLM();
	virtual void sgLightingLM(const Point3F &point, VectorF normal, ColorF &diffuse, ColorF &ambient, Point3F &lightingnormal);
	// only for TSE's consistent lighting models...
	// TGE's vertex lighting requires the base
	// class method sgLightingModelGLBase::sgScoreLight...
	//virtual F32 sgScoreLight(LightInfo *light, const SphereF &sphere);
	virtual bool sgCanIlluminate(const Box3F &box);
	virtual F32 sgGetMaxRadius(bool speedoverquality=false, bool glstyle=false)
	{
		AssertFatal((sgStateSet == true), "sgLightingModel: State not properly set.");
		if(glstyle)
			return sgLightingModelGLBase::sgGetMaxRadius(speedoverquality, glstyle);
		return sgLight->mRadius;
	}
};

class sgLightingModelStock : public sgLightingModelGLBase
{
public:
	sgLightingModelStock()
	{
		dSprintf(sgLightingModelName, sizeof(sgLightingModelName),
			SG_LIGHTINGMODEL_NAME, "Original Stock");
	}
	void sgSetState(LightInfo *light)
	{
		sgLightingModelGLBase::sgSetState(light);
		if(sgLight->mRadius > 0.0f)
			sgQuadraticAttenuation = (1.0f / (sgLight->mRadius * sgLight->mRadius));
		else
			sgQuadraticAttenuation = 0.0f;
	}
};

class sgLightingModelInverseSquare : public sgLightingModelGLBase
{
public:
	sgLightingModelInverseSquare()
	{
		dSprintf(sgLightingModelName, sizeof(sgLightingModelName),
			SG_LIGHTINGMODEL_NAME, "Inverse Square");
	}
	void sgSetState(LightInfo *light)
	{
		sgLightingModelGLBase::sgSetState(light);
		sgConstantAttenuation = 1.0f;
		if(sgLight->mRadius > 0.0f)
			sgQuadraticAttenuation = (1.0f / (sgLight->mRadius * sgLight->mRadius));
		else
			sgQuadraticAttenuation = 0.0f;
	}
};

class sgLightingModelInverseSquareFastFalloff : public sgLightingModelGLBase
{
public:
	sgLightingModelInverseSquareFastFalloff()
	{
		dSprintf(sgLightingModelName, sizeof(sgLightingModelName),
			SG_LIGHTINGMODEL_NAME, "Inverse Square Fast Falloff");
	}
	void sgSetState(LightInfo *light)
	{
		sgLightingModelGLBase::sgSetState(light);
		sgConstantAttenuation = 1.0f;
		if(sgLight->mRadius > 0.0f)
			sgQuadraticAttenuation = (10.0f / (sgLight->mRadius * sgLight->mRadius));
		else
			sgQuadraticAttenuation = 0.0f;
	}
};

class sgLightingModelNearLinear : public sgLightingModelGLBase
{
public:
	sgLightingModelNearLinear()
	{
		dSprintf(sgLightingModelName, sizeof(sgLightingModelName),
			SG_LIGHTINGMODEL_NAME, "Near Linear");
	}
	void sgSetState(LightInfo *light)
	{
		sgLightingModelGLBase::sgSetState(light);
		sgConstantAttenuation = 1.0f;
		if(sgLight->mRadius > 0.0f)
			sgLinearAttenuation = (1.0f / sgLight->mRadius);
		else
			sgLinearAttenuation = 0.0f;
	}
};

class sgLightingModelNearLinearFastFalloff : public sgLightingModelGLBase
{
public:
	sgLightingModelNearLinearFastFalloff()
	{
		dSprintf(sgLightingModelName, sizeof(sgLightingModelName),
			SG_LIGHTINGMODEL_NAME, "Near Linear Fast Falloff");
	}
	void sgSetState(LightInfo *light)
	{
		sgLightingModelGLBase::sgSetState(light);
		sgConstantAttenuation = 1.0f;
		if(sgLight->mRadius > 0.0f)
			sgLinearAttenuation = (10.0f / sgLight->mRadius);
		else
			sgLinearAttenuation = 0.0f;
	}
};

class sgLightingModelManager
{
private:
	static Vector<sgLightingModel *> sgLightingModels;
	static sgLightingModelStock sgDefaultModel;
	static sgLightingModelAdvanced sgAdvancedModel;
	static sgLightingModelInverseSquare sgInverseSquare;
	static sgLightingModelInverseSquareFastFalloff sgInverseSquareFastFalloff;
	static sgLightingModelNearLinear sgNearLinear;
	static sgLightingModelNearLinearFastFalloff sgNearLinearFastFalloff;
	static sgLightingModel *sgSunlightModel;
public:
	sgLightingModelManager() {}
	static void sgRegisterLightingModel(sgLightingModel *model) {sgLightingModels.push_back(model);}
	static sgLightingModel &sgGetLightingModel() {return sgDefaultModel;}
	static sgLightingModel &sgGetLightingModel(const char *name)
	{
		if((name == NULL) || (name[0] == 0))
			return sgDefaultModel;
		for(U32 i=0; i<sgLightingModels.size(); i++)
		{
			if(dStrcmp(sgLightingModels[i]->sgLightingModelName, name) == 0)
				return *(sgLightingModels[i]);
		}
		return sgDefaultModel;
	}
	static U32 sgGetLightingModelCount() {return sgLightingModels.size();}
	static char *sgGetLightingModelName(U32 index)
	{
		if((index < 0) || (index >= sgLightingModels.size()))
			return "";
		return sgLightingModels[index]->sgLightingModelName;
	}
	static const char *sgGetSunlightLightingModelName()
	{
		if(sgSunlightModel)
			return sgSunlightModel->sgLightingModelName;
		return NULL;
	}
	static char *sgGetAdvancedLightingModelName() {return sgAdvancedModel.sgLightingModelName;}
	static char *sgGetStockLightingModelName() {return sgDefaultModel.sgLightingModelName;}
};


#endif//_SGLIGHTINGMODEL_H_