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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 "constants.h"
#include "environmentMap.h"
//////////////////
// Constructors //
//////////////////
environmentMap::environmentMap(const std::shared_ptr<const texture_base>& map, const transformation3d& transform)
{
_map = map;
_transform = transform;
}
environmentMap::environmentMap(const environmentMap& src)
{
_map = src._map;
_transform = src._transform;
}
///////////////
// Operators //
///////////////
environmentMap environmentMap::operator=(const environmentMap& src)
{
_assign(src);
return *this;
}
color environmentMap::operator()(const vec3d& direction) const
{
// HW5: Implement this. Given a 'direction' return the corresponding
// texel from the _map. The environment map uses spherical coordinates
// for mapping a direction to a (phi, theta) pair (which are subsequently
// mapped to pixel coordinates. (x,y,z) = (cos(phi)*sin(theta),
// sin(phi)*sin(theta), cos(theta)).
// Modifies: nothing
// Returns: color
vec3d reflect_dir = _transform.inverseTransformDirection(direction); // invert
float phi = (acos(reflect_dir.z) + PI) / PI; // make positive, scale: 180
float theta = atan2(reflect_dir.y, reflect_dir.x) / (2 * PI); // scale: 360
return (*_map)(vec2d(theta, phi)); // return texel
}
///////////////////////
// Protected Methods //
///////////////////////
void environmentMap::_assign(const environmentMap& src)
{
if(&src == this) return;
_map = src._map;
_transform = src._transform;
}
void environmentMap::_swap(environmentMap& swp)
{
std::swap(_map, swp._map);
swap(_transform, swp._transform);
}
void environmentMap::_print(std::ostream& s) const
{
s << "Environment Map (" << *_map << ", " << _transform << ")";
}
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