libcruft-util/noise.cpp

/*
 * This file is part of libgim.
 *
 * libgim 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 3 of the License, or (at your option) any later
 * version.
 * 
 * libgim 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 libgim.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright 2011 Danny Robson <danny@nerdcruft.net>
 */


#include "noise.hpp"

#include "range.hpp"

#include <iostream>

void
util::noise::image2d (uint8_t *restrict pixels,
                      size_t            width,
                      size_t            height,
                      const util::noise::fractal &p) {
    util::range<double> r(0.0,0.0);

    for (size_t y = 0; y < height; ++y)
        for (size_t x = 0; x < width; ++x) {
            double v = p.eval (x / double (width) * 2, y / double (height) * 2);
            r.expand (v);
            v += 1.0;
            v /= 2.0;
            pixels[x + y * width] = v * std::numeric_limits<uint8_t>::max ();
        }

    std::cerr << r << "\n";
}