/*-----------------------------------------------------------------*/
// Author:         Darryl Davis
// File:           RenderLight.cpp
// Date:           8/18/06
// Last Update:    8/21/06
// Purpose:        RenderLight inherits from RenderObject and is used
//				   to display an OpenGL light in the scene.
/*-----------------------------------------------------------------*/

#include "RenderLight.h"
#include "RenderPrimitive.h"

/*-----------------------------------------------------------------*/
// Name:	initialize()
// Date:    8/24/06
// In:     
// Purpose: Initialize the light, do this once.
/*-----------------------------------------------------------------*/
void CRenderLight::initialize(void)
{
	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0);
	
	m_fPosition[0] = 0.0f;
	m_fPosition[1] = 0.0f;
	m_fPosition[2] = 20.0f;
	m_fPosition[3] = 1.0f;

	//	Turn Off *global ambient* light - cbr
	GLfloat noLight[] = { 0.0f, 0.0f, 0.0f };
	GLfloat someLight[] = { 0.4f, 0.4f, 0.4f };
	GLfloat diffuseLight[] = { 0.1f, 0.1f, 0.1f, 0.1f };
	//GLfloat lightPos[] = { 100.0f, 0.0f, -100.0f };
	GLfloat gray[] = { 0.5f, 0.5f, 0.5f };
	glLightModelfv(GL_LIGHT_MODEL_AMBIENT, noLight);
	
	GLfloat spotDir[] = { 0.0f, 0.0f, -1.0f };

	glLightfv(GL_LIGHT0, GL_AMBIENT, noLight);
	glLightfv(GL_LIGHT0, GL_DIFFUSE, someLight);
//	glLightfv(GL_LIGHT0, GL_SPECULAR, someLight);
	glLightfv(GL_LIGHT0, GL_SPOT_DIRECTION, spotDir);
	glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 200.0f);
//	glLightfv(GL_LIGHT0, GL_POSITION, m_fPosition);

	glEnable(GL_COLOR_MATERIAL);
	glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, gray);
	glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
}

/*--------------------------------------------------------*/
// Name:	render
// Date:	8/24/06
// Purpose:	The Render function renders the light.
/*--------------------------------------------------------*/
void CRenderLight::render(void)
{
	static float m_fRotate = 0.0f;
	glDisable(GL_LIGHTING);
	
	glPushMatrix();
	//m_fPosition[2] += 0.01f;
	//glRotatef(m_fRotate, 1.0f, 0.0f, 0.0f);
	glTranslatef( m_fPosition[0], m_fPosition[1], m_fPosition[2] );
	
	glColor3f(1.0f, 1.0f, 1.0f);

	GLUquadric *pSphere = gluNewQuadric();
	gluSphere(pSphere, 1.0f, 10, 10);
	gluDeleteQuadric(pSphere);

	glPopMatrix();

	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0);
	glLightfv(GL_LIGHT0, GL_POSITION, m_fPosition);
	
	//	Draw a sphere!
	m_fRotate += 0.1f;
	
}

void CRenderLight::enable()
{
	
}

void CRenderLight::disable()
{
	glDisable(GL_LIGHT0);
}