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

#ifndef WB3ARTIFACT_H
#define WB3ARTIFACT_H

#include "ray3f.hpp"
#include "wb3Shader.hpp"
#include "wb3Material.hpp"

class wb3Artifact
{
public:
  wb3Artifact();
  ~wb3Artifact();

  virtual const wb3Artifact* Intersect(const Ray3f& r, float *idist,
                                       const wb3Artifact* ignore =0) const = 0;
  virtual void GetNormal(const Ray3f& r, const Vec3f &isect, Vec3f& normal) 
    const = 0;

  virtual void Shade(const wb3Scene* scene,
                     const wb3Artifact* from,
                     const wb3Artifact* hit,
                     const Ray3f& r, const Vec3f &isect, 
                     Vec3f& color, Vec3f& attenuation, int hits) const;
  virtual float GetIndex() const; // index of refraction

  wb3Shader* GetShader() const;
  void SetShader(wb3Shader *pShader);

  wb3Material* GetMaterial() const;
  void SetMaterial(wb3Material *pMaterial);

protected:
  wb3Shader *m_pShader;
  wb3Material *m_pMaterial;

  static const float ms_fEps;
};

//----------------------------------------------------------------------------
inline void wb3Artifact::Shade(
  const wb3Scene *scene, 
  const wb3Artifact *from,
  const wb3Artifact *hit,
  const Ray3f& r, const Vec3f &isect, 
  Vec3f& color, Vec3f& attenuation, int hits) const
{
  if (m_pShader)
    m_pShader->Shade(scene, from, hit, r, isect, color, attenuation, hits);
}
//----------------------------------------------------------------------------
inline float wb3Artifact::GetIndex() const
{
  if (m_pMaterial)
    return m_pMaterial->GetIndex();
  else
    return 1.0;
}
//----------------------------------------------------------------------------
inline wb3Shader* wb3Artifact::GetShader() const
{
  return m_pShader;
}
//----------------------------------------------------------------------------
inline void wb3Artifact::SetShader(wb3Shader *pShader)
{
  m_pShader = pShader;
}
//----------------------------------------------------------------------------
inline wb3Material* wb3Artifact::GetMaterial() const
{
  return m_pMaterial;
}
//----------------------------------------------------------------------------
inline void wb3Artifact::SetMaterial(wb3Material *pMaterial)
{
  m_pMaterial = pMaterial;
}

#endif