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/******************************************************************/
/* 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 <cmath>
#include "lightSample.h"
//////////////////
// Constructors //
//////////////////
lightSample::lightSample(const vec3d& direction,
const color& emittance,
float distance,
float pdf,
float foreshortening)
{
float length = direction.length();
_direction = (length < EPSILON) ? vec3d(0.0f, 0.0f, 0.0f) : direction / length;
_emittance = emittance;
_distance = distance;
_pdf = std::max(pdf, 0.0f);
_foreshortening = std::max(foreshortening, 0.0f);
}
lightSample::lightSample(const lightSample& ls)
{
_direction = ls._direction;
_emittance = ls._emittance;
_distance = ls._distance;
_pdf = ls._pdf;
_foreshortening = ls._foreshortening;
}
///////////////
// Operators //
///////////////
lightSample& lightSample::operator=(const lightSample& ls)
{
_assign(ls);
return(*this);
}
const color& lightSample::operator()(void) const
{
return _emittance;
}
////////////////
// Inspectors //
////////////////
const vec3d& lightSample::directionToPoint(void) const
{
return _direction;
}
vec3d lightSample::directionToLight(void) const
{
return -_direction;
}
const color& lightSample::emittance(void) const
{
return _emittance;
}
float lightSample::distance(void) const
{
return _distance;
}
float lightSample::pdf(void) const
{
return _pdf;
}
float lightSample::foreshortening(void) const
{
return _foreshortening;
}
/////////////////////
// Private Methods //
/////////////////////
void lightSample::_assign(const lightSample& ls)
{
// sanity check
if(&ls == this) return;
// copy
_direction = ls._direction;
_emittance = ls._emittance;
_distance = ls._distance;
_pdf = ls._pdf;
_foreshortening = ls._foreshortening;
}
void lightSample::_swap(lightSample& ls)
{
swap(_direction, ls._direction);
swap(_emittance, ls._emittance);
std::swap(_distance, ls._distance);
std::swap(_pdf, ls._pdf);
std::swap(_foreshortening, ls._foreshortening);
}
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