libcruft-util/noise.cpp

56 lines
1.8 KiB
C++

/*
* 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 2011-2015 Danny Robson <danny@nerdcruft.net>
*/
#include "noise.hpp"
#include "range.hpp"
#include <iostream>
#include <limits>
//-----------------------------------------------------------------------------
template <typename T>
void
util::noise::fill (image::buffer<1,T> &pixels,
const util::noise::fractal<T> &gen)
{
size_t h = pixels.h, s = pixels.s, w = pixels.w;
T *data = pixels.data ();
for (size_t y = 0; y < h; ++y)
for (size_t x = 0; x < w; ++x)
data[y * s + x] = gen ({T(x), T(y)});
}
template void util::noise::fill (image::buffer<1,float>&, const util::noise::fractal<float>&);
template void util::noise::fill (image::buffer<1,double>&, const util::noise::fractal<double>&);
//-----------------------------------------------------------------------------
void
util::noise::image2d (uint8_t *restrict pixels,
size_t width,
size_t height,
const util::noise::fractal<float> &p) {
for (size_t y = 0; y < height; ++y)
for (size_t x = 0; x < width; ++x) {
float v = p ({float(x), float(y)});
pixels[x + y * width] = static_cast<uint8_t> (v * std::numeric_limits<uint8_t>::max ());
}
}