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

#ifndef WB3DIRLIGHT_H
#define WB3DIRLIGHT_H

#include <vec3f.hpp>
#include "ray3f.hpp"
#include "wb3Light.hpp"

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

class wb3Scene;
class wb3Artifact;

class wb3DirectionalLight : public wb3Light
{
public:

  wb3DirectionalLight(const Vec3f& dirn = Vec3f::ZERO);
  wb3DirectionalLight(const Vec3f& color, const Vec3f& dirn);
  ~wb3DirectionalLight() {};

  const Vec3f& GetDirection() const;
  void SetDirection(const Vec3f& dirn);

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

protected:
  Vec3f m_dir;
};

//----------------------------------------------------------------------------
inline const Vec3f& wb3DirectionalLight::GetDirection() const
{
  return m_dir;
}
//----------------------------------------------------------------------------
inline void wb3DirectionalLight::SetDirection(const Vec3f& dir)
{
  m_dir = dir;
}
//----------------------------------------------------------------------------
#endif