rgb-voronoi-noise.cpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code 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.
 *
 * Antkeeper source code 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 Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "game/textures/rgb-voronoi-noise.hpp"
#include <engine/math/noise/noise.hpp>
#include <engine/debug/log.hpp>
#include <algorithm>
#include <execution>
#include <fstream>
#include <stb/stb_image_write.h>
 
void generate_rgb_voronoi_noise(std::filesystem::path path)
{
    /*
    image img;
    img.format(4, 8);
    img.resize(1024, 1024);
    
    auto width = img.width();
    auto height = img.height();
    unsigned char* pixels = (unsigned char*)img.data();
    
    const float frequency = 512.0f;
    float scale_x = 1.0f / static_cast<float>(width - 1) * frequency;
    float scale_y = 1.0f / static_cast<float>(height - 1) * frequency;
    
    std::for_each
    (
        std::execution::par_unseq,
        img.begin<math::vec4<unsigned char>>(),
        img.end<math::vec4<unsigned char>>(),
        [pixels, width, height, scale_x, scale_y, frequency](auto& pixel)
        {
            const std::size_t i = &pixel - (math::vec4<unsigned char>*)pixels;
            const std::size_t y = i / width;
            const std::size_t x = i % width;
            
            const math::fvec2 position =
            {
                static_cast<float>(x) * scale_x,
                static_cast<float>(y) * scale_y
            };
            
            const auto
            [
                f1_sqr_distance,
                f1_displacement,
                f1_id,
                f1_edge_sqr_distance
            ] = math::noise::voronoi::f1_edge<float, 2>(position, 1.0f, {frequency, frequency});
            
            const float f1_edge_distance = std::sqrt(f1_edge_sqr_distance);
            
            const float scale = 255.0f * (255.0f / 204.0f);
            pixel = 
            {
                static_cast<unsigned char>(f1_id & 255),
                static_cast<unsigned char>((f1_id >> 8) & 255),
                static_cast<unsigned char>((f1_id >> 16) & 255),
                static_cast<unsigned char>((f1_id >> 24) & 255)
            };
            
            // const float f1_distance = std::sqrt(f1_sqr_distance);
            // const math::fvec2 uv = (position + f1_displacement) / frequency;
            
            // pixel = 
            // {
                // static_cast<unsigned char>(std::min(255.0f, f1_distance * 255.0f)),
                // static_cast<unsigned char>(std::min(255.0f, uv[0] * 255.0f)),
                // static_cast<unsigned char>(std::min(255.0f, uv[1] * 255.0f)),
                // static_cast<unsigned char>(f1_id % 256)
            // };
        }
    );
    
    stbi_flip_vertically_on_write(1);
    stbi_write_png(path.string().c_str(), img.width(), img.height(), img.channel_count(), img.data(), img.width() * img.channel_count());
    */
}