ant-gene-loader.hpp

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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/>.
 */
 
#ifndef ANTKEEPER_GAME_ANT_GENE_LOADER_HPP
#define ANTKEEPER_GAME_ANT_GENE_LOADER_HPP
 
#include "game/ant/genes/ant-gene.hpp"
#include <engine/resources/resource-manager.hpp>
#include <engine/resources/deserialize-context.hpp>
#include <engine/resources/deserialize-error.hpp>
 
template <class T>
void load_ant_gene(ant_gene<T>& gene, resource_manager& resource_manager, deserialize_context& ctx, void (*load_phene)(T&, ::resource_manager&, deserialize_context&))
{
    // Read file format identifier
    std::uint32_t format_identifier{0};
    ctx.read32<std::endian::little>(reinterpret_cast<std::byte*>(&format_identifier), 1);
    
    // Validate file format identifier (U+1F9EC = DNA double helix)
    if (format_identifier != 0xaca79ff0)
    {
        throw deserialize_error("Invalid ant gene file");
    }
    
    // Read file format version
    std::uint16_t format_version{0};
    ctx.read16<std::endian::little>(reinterpret_cast<std::byte*>(&format_version), 1);
    
    // Validate file format version
    if (format_version != 1)
    {
        throw deserialize_error("Unsupported ant gene format");
    }
    
    // Read gene type
    ant_gene_type gene_type{0};
    ctx.read8(reinterpret_cast<std::byte*>(&gene_type), 1);
    
    // Validate gene type
    if (gene_type != gene.type())
    {
        throw deserialize_error("Mismatched ant gene type");
    }
    
    // Read gene name
    ctx.read32<std::endian::little>(reinterpret_cast<std::byte*>(&gene.name), 1);
    
    // Read phene count
    std::uint8_t phene_count{0};
    ctx.read8(reinterpret_cast<std::byte*>(&phene_count), 1);
    
    // Allocate phenes
    gene.phenes.resize(phene_count);
    
    // Load phenes
    for (auto& phene: gene.phenes)
    {
        // Read phene caste flags
        std::uint8_t caste_flags{0};
        ctx.read8(reinterpret_cast<std::byte*>(&caste_flags), 1);
        
        // Load phene
        load_phene(phene, resource_manager, ctx);
        
        // Map flagged castes to phene
        int caste_count = std::popcount(caste_flags);
        if (caste_count == 1)
        {
            gene.phene_map[static_cast<ant_caste_type>(caste_flags)] = &phene;
        }
        else
        {
            for (std::uint8_t i = 0; i < 8; ++i)
            {
                const std::uint8_t caste_mask = 1 << i;
                if (caste_flags & caste_mask)
                {
                    gene.phene_map[static_cast<ant_caste_type>(caste_mask)] = &phene;
                    if (--caste_count; !caste_count)
                    {
                        break;
                    }
                }
            }
        }
    }
}
 
#endif // ANTKEEPER_GAME_ANT_GENE_LOADER_HPP