resource-manager.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 <engine/resources/resource-manager.hpp>
#include <engine/debug/log.hpp>
#include <engine/resources/physfs/physfs-deserialize-context.hpp>
#include <engine/resources/physfs/physfs-serialize-context.hpp>
#include <physfs.h>
#include <stdexcept>
 
resource_manager::resource_manager()
{
    // Log PhysicsFS info
    // PHYSFS_Version physfs_compiled_version;
    // PHYSFS_Version physfs_linked_version;
    // PHYSFS_VERSION(&physfs_compiled_version);
    // PHYSFS_getLinkedVersion(&physfs_linked_version);
    // debug::log_info
    // (
        // "PhysicsFS compiled version: {}.{}.{}; linked version: {}.{}.{}",
        // physfs_compiled_version.major,
        // physfs_compiled_version.minor,
        // physfs_compiled_version.patch,
        // physfs_linked_version.major,
        // physfs_linked_version.minor,
        // physfs_linked_version.patch
    // );
    
    // Init PhysicsFS
    debug::log_trace("Initializing PhysicsFS...");
    if (!PHYSFS_init(nullptr))
    {
        debug::log_error("Failed to initialize PhysicsFS: {}", PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
        throw std::runtime_error("Failed to initialize PhysicsFS");
    }
    else
    {
        debug::log_trace("Initialized PhysicsFS");
    }
}
 
resource_manager::~resource_manager()
{
    // Deinit PhysicsFS
    debug::log_trace("Deinitializing PhysicsFS...");
    if (!PHYSFS_deinit())
    {
        debug::log_error("Failed to deinitialize PhysicsFS: {}", PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
    }
    else
    {
        debug::log_trace("Deinitialized PhysicsFS");
    }
}
 
bool resource_manager::mount(const std::filesystem::path& path)
{
    const std::string path_string = path.string();
    
    debug::log_trace("Mounting path \"{}\"...", path_string);
    
    if (!PHYSFS_mount(path_string.c_str(), nullptr, 1))
    {
        debug::log_error("Failed to mount path \"{}\": {}", path_string, PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
        return false;
    }
    
    debug::log_trace("Mounted path \"{}\"", path_string);
    
    return true;
}
 
bool resource_manager::unmount(const std::filesystem::path& path)
{
    const std::string path_string = path.string();
    
    debug::log_trace("Unmounting path \"{}\"...", path_string);
    
    if (!PHYSFS_unmount(path_string.c_str()))
    {
        debug::log_error("Failed to unmount path \"{}\": {}", path_string, PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
        return false;
    }
    
    debug::log_trace("Unmounted path \"{}\"", path_string);
    
    return true;
}
 
bool resource_manager::set_write_path(const std::filesystem::path& path)
{
    const std::string path_string = path.string();
    
    if (!PHYSFS_setWriteDir(path_string.c_str()))
    {
        debug::log_error("Failed set write path to \"{}\": {}", path_string, PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
        return false;
    }
    
    write_path = path;
    
    debug::log_trace("Set write path to \"{}\"", path_string);
    
    return true;
}
 
std::shared_ptr<void> resource_manager::fetch(const std::filesystem::path& path) const
{
    if (auto i = resource_cache.find(path); i != resource_cache.end())
    {
        if (!i->second.expired())
        {
            return i->second.lock();
        }
        else
        {
            debug::log_trace("Fetched expired resource from cache \"{}\"", path.string());
        }
    }
    
    return nullptr;
}
 
std::unique_ptr<deserialize_context> resource_manager::open_read(const std::filesystem::path& path) const
{
    auto ctx = std::make_unique<physfs_deserialize_context>(path);
    if (!ctx->is_open())
    {
        debug::log_error("Failed to open file \"{}\" for reading: {}", path.string(), PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
        return nullptr;
    }
    
    return ctx;
}
 
std::unique_ptr<serialize_context> resource_manager::open_write(const std::filesystem::path& path) const
{
    auto ctx = std::make_unique<physfs_serialize_context>(path);
    if (!ctx->is_open())
    {
        debug::log_error("Failed to open file \"{}\" for writing: {}", path.string(), PHYSFS_getErrorByCode(PHYSFS_getLastErrorCode()));
        return nullptr;
    }
    
    return ctx;
}