// Light.cpp: implementation of the Light class.
//
//////////////////////////////////////////////////////////////////////

#include "Light.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

Light::Light()
{

}

Light::~Light()
{

}

void Light::SetLight(GLenum light)
{
	//glLightfv(light,GL_AMBIENT,m_Ambient_Color.GetArrayf());
	glLightfv(light,GL_DIFFUSE,m_Diffuse_Color.GetArrayf());
	//glLightfv(light,GL_AMBIENT,m_Diffuse_Color.GetArrayf());
	glLightfv(light,GL_SPECULAR,m_Specular_Color.GetArrayf());

	if(this->m_type==LIGHT_TYPE_DIRECTIONAL)
	{
		m_Position.z=0;
		m_Position.x=-1*m_Spot_Direction.x;
		m_Position.y=-1*m_Spot_Direction.y;
		m_Position.z=-1*m_Spot_Direction.z;
	}
	glLightfv(light,GL_POSITION,m_Position.GetArrayf());

	if(m_type==LIGHT_TYPE_SPOT)
	{
	glLightfv(light,GL_SPOT_DIRECTION,m_Spot_Direction.GetArrayf());
	glLightf(light,GL_SPOT_EXPONENT,m_Exponent);
	glLightf(light,GL_SPOT_CUTOFF,m_Cutoff);
	}

	if(this->m_type==LIGHT_TYPE_POINT)
	{
		m_Cutoff=180;
		glLightf(light,GL_SPOT_CUTOFF,m_Cutoff);
	}	

	glEnable(light);
}

void Light::Load(ifstream *file)
{
	fprintf(stderr, "Loading Light...\n");
	
	char* tempchar=new char[500];
	file->getline(tempchar,500,' ');
	file->getline(tempchar,500,'\n');
	//pointlight
	if(tempchar[0]=='p')
	{
		m_type=0;
	}
	//directionallight
	if(tempchar[0]=='d')
	{
		m_type=1;
	}
	//spotlight
	if(tempchar[0]=='s')
	{
		m_type=2;
	}
	
	file->getline(tempchar,500,'\n');
	sscanf(tempchar,"color %f %f %f",&m_Diffuse_Color.x,&m_Diffuse_Color.y,&m_Diffuse_Color.z);
	m_Specular_Color=m_Diffuse_Color;

	switch(m_type)
	{
	case 0:
		file->getline(tempchar,500,'\n');
		sscanf(tempchar,"position %f %f %f",&m_Position.x,&m_Position.y,&m_Position.z);
		m_Position.w=1;
		file->getline(tempchar,500,'\n');
		break;
	case 1:
		file->getline(tempchar,500,'\n');
		sscanf(tempchar,"position %f %f %f",&m_Position.x,&m_Position.y,&m_Position.z);
		m_Position.w=0;
		sscanf(tempchar,"direction %f %f %f",&m_Position.x,&m_Position.y,&m_Position.z);
		break;
	case 2:
		file->getline(tempchar,500,'\n');
		sscanf(tempchar,"position %f %f %f",&m_Position.x,&m_Position.y,&m_Position.z);
		m_Position.w=1;
		sscanf(tempchar,"direction %f %f %f",&m_Spot_Direction.x,&m_Spot_Direction.y,&m_Spot_Direction.z);
		break;
	}	
}