stratifiedsurfacesampler.cpp

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/*
    toxic - A Global Illumination Renderer
    Copyright (C) 2003-2004 Francois Beaune
    Contact: http://toxicengine.sourceforge.net/

    This file is part of toxic.

    toxic 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.

    toxic 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 toxic; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "stratifiedsurfacesampler.h"   // include first
#include "context.h"

#include <cassert>

using namespace sheep;
using namespace toxic;

StratifiedSurfaceSampler::StratifiedSurfaceSampler(int w, int h) :
    ISurfaceSampler(w * h),
    m_w(w), m_h(h),
    m_inv_w(1.0 / w),
    m_inv_h(1.0 / h)
{
    assert(m_w > 0);
    assert(m_h > 0);
}

void StratifiedSurfaceSampler::GenerateNewSamples(const Context &context) {
    m_samples.clear();

    for(int j = 0; j < m_h; ++j) {
        for(int i = 0; i < m_w; ++i) {
            const Real xi1 = (i + context.m_rng->RandomReal1()) * m_inv_w;
            const Real xi2 = (j + context.m_rng->RandomReal1()) * m_inv_h;

            m_samples.push_back(Point2(xi1, xi2));
        }
    }
}

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