/******************************************************************/
/* This file is part of the homework assignments for CSCI-427/527 */
/* at The College of William & Mary and authored by Pieter Peers. */
/* No part of this file, whether altered or in original form, can */
/* be distributed or used outside the context of CSCI-427/527     */
/* without consent of either the College of William & Mary or     */
/* Pieter Peers.                                                  */
/******************************************************************/
#include "raycasting.h"

/////////////
// Methods //
/////////////
image raycasting::render(const scene& s) const
{
  image result(s.getCamera().width(), s.getCamera().height());

  // for every pixel
  for(image::size_type y=0; y < result.height(); y++)
    for(image::size_type x=0; x < result.width(); x++)
    {
      // generate view ray
      ray r = s.getCamera()(x,y);

      // intersect scene
      intersectionPoint ip = s.intersect(r);

      // shade pixel
      if(ip.isHit())
      {
	// for each light source
	for(unsigned int l=0; l < s.numberOfLightsources(); l++)
	{
	  // connect to light source
	  lightSample ls = s.getLightsource(l).intensityAt(ip.position());

	  // shade
	  result(x,y) += ip.shade(ls);
	}
      }
      else result(x,y) = color(0.0f, 0.0f, 0.0f);
    }
  

  // Done.
  return result;
}