//----------------------------------------------------------------------------
// William Baxter III's Ray Tracer
//
//     Project for Comp 238, Raster Graphics
//     University of North Carolina at Chapel Hill
//     
// $Id:$
//----------------------------------------------------------------------------

#ifndef WB3EXTENDEDLIGHT_H
#define WB3EXTENDEDLIGHT_H

#include <vec3f.hpp>
#include "ray3f.hpp"
#include "wb3PointLight.hpp"

//----------------------------------------------------------------------------

class wb3Scene;
class wb3Artifact;

class wb3ExtendedLight : public wb3PointLight
{
public:

  wb3ExtendedLight(const Vec3f& positon = Vec3f::ZERO);
  wb3ExtendedLight(const Vec3f& color, const Vec3f& positon, float radius);
  ~wb3ExtendedLight() {};

  float GetRadius() const;
  void SetRadius(float radius);

  void PerturbSample(Vec3f& pos, const Vec3f& u, const Vec3f& v) const;

  virtual void Contribute(
    const wb3Scene *scene, const wb3Artifact *hit, 
    const Ray3f& r, const Vec3f &isect, const Vec3f &N,
    Vec3f& color) const;

protected:
  float m_fRadius;
};

//----------------------------------------------------------------------------
inline float wb3ExtendedLight::GetRadius() const
{
  return m_fRadius;
}
//----------------------------------------------------------------------------
inline void wb3ExtendedLight::SetRadius(float radius)
{
  m_fRadius = radius;
}
//----------------------------------------------------------------------------
#endif