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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 "bilinearTexture.h"
//////////////////
// Constructors //
//////////////////
bilinearTexture::bilinearTexture(bool repeat)
: texture_base(repeat)
{
// Do nothing.
}
bilinearTexture::bilinearTexture(const bilinearTexture& src)
: texture_base(src)
{
// Do nothing
}
///////////////
// Operators //
///////////////
bilinearTexture& bilinearTexture::operator=(const bilinearTexture& src)
{
_assign(src);
return *this;
}
image::value_type bilinearTexture::operator()(const vec2d& textureCoord) const
{
// HW5: Implement a bilinear texture evaluation. Given a texture coordinate
// return the bilinearly interpolate the color.
// Modifes: nothing.
// Returns: color.
vec2d::value_type x, y, x1, x2, y1, y2, dx, dy;
color a, b;
x = textureCoord.u * (image::width() - 1);
y = textureCoord.v * (image::height() - 1);
x1 = floor(x);
x2 = x1 + 1;
y1 = floor(y);
y2 = y1 + 1;
dx = x - x1;
dy = y - y1;
a = _at(x1, y1) * (1 - dx) + _at(x2, y1) * dx;
b = _at(x1, y2) * (1 - dx) + _at(x2, y2) * dx;
return a * (1 - dy) + b * (dy);
}
/////////////////////
// Private Methods //
/////////////////////
void bilinearTexture::_print(std::ostream& s) const
{
s << "Bilinear texture (" << this->width() << "x" << this->height() << ")";
}
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