
/*
    pbrt source code Copyright(c) 1998-2010 Matt Pharr and Greg Humphreys.

    This file is part of pbrt.

    pbrt is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.  Note that the text contents of
    the book "Physically Based Rendering" are *not* licensed under the
    GNU GPL.

    pbrt is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */


// filters/sinc.cpp*
#include "stdafx.h"
#include "filters/sinc.h"
#include "paramset.h"

// Sinc Filter Method Definitions
float LanczosSincFilter::Evaluate(float x, float y) const {
    return Sinc1D(x * invXWidth) * Sinc1D(y * invYWidth);
}


LanczosSincFilter *CreateSincFilter(const ParamSet &ps) {
    float xw = ps.FindOneFloat("xwidth", 4.);
    float yw = ps.FindOneFloat("ywidth", 4.);
    float tau = ps.FindOneFloat("tau", 3.f);
    return new LanczosSincFilter(xw, yw, tau);
}


