libcruft-util/noise.cpp

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright 2011 Danny Robson <danny@nerdcruft.net>
 */


#include "noise.hpp"

#include "range.hpp"

#include <iostream>
#include <limits>

void
util::noise::image2d (uint8_t *restrict pixels,
                      size_t            width,
                      size_t            height,
                      const util::noise::fractal &p) {
    for (size_t y = 0; y < height; ++y)
        for (size_t x = 0; x < width; ++x) {
            double v = p.eval (x, y);
            pixels[x + y * width] = static_cast<uint8_t> (v * std::numeric_limits<uint8_t>::max ());
        }
}