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/**
* @file gamestate.hpp
* Provides functionality to load and save entity data to or from JSON files.
*
* Copyright (C) 2019 Clyne Sullivan
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GAMELOAD_HPP_
#define GAMELOAD_HPP_
#include <cereal/cereal.hpp>
#include <cereal/archives/json.hpp>
#include <entityx/entityx.h>
#include <fstream>
struct EntitySerializer
{
template<class Archive>
static void serialize(entityx::EntityManager& entities, entityx::Entity entity, bool save, Archive& ar)
{
// TODO try and reimplement without modifying entityx?
// Or, make a new branch...
//const auto mask = entity.component_mask();
//for (size_t i = 0; i < entities.component_helpers_.size(); i++) {
// auto helper = entities.component_helpers_[i];
// if (helper && mask.test(i)) {
// auto* c = helper->get_component(entity);
// ar.setNextName(c->serializeName().c_str());
// ar.startNode();
// c->internal_serialize(save, static_cast<void*>(&ar));
// ar.finishNode();
// }
//}
}
};
/**
* @class GameState
* Manages save files that contain entity data.
*/
class GameState
{
public:
/**
* Loads entity data from a JSON file into entities contained in the
* entity manager.
*
* The order of entities and the components they have must match between
* those in the manager and those in the file.
*
* @param file The file to load from
* @param entities The entity manager to load into
* @return True if successful load
*/
static bool load(const std::string& file, entityx::EntityManager &entities)
{
std::ifstream saveFile (file);
bool opened = saveFile.good();
if (opened) {
cereal::JSONInputArchive archive (saveFile);
serializeEntities(archive, false, entities);
}
return opened;
}
/**
* Saves entity data from the entities in the provided manager into a JSON
* file,
*
* @param file The file to load from
* @param entities The entity manager to get entity data from
* @return True if successful save
*/
static bool save(const std::string& file, entityx::EntityManager &entities)
{
std::ofstream saveFile (file);
bool opened = saveFile.good();
if (opened) {
cereal::JSONOutputArchive archive (saveFile);
serializeEntities(archive, true, entities);
}
return opened;
}
private:
/**
* Calls the serialization funciton for each entity in the given entity
* manager.
* @param archive The archive to save/load with (cereal::JSON...)
* @param save True to save data, false to load
* @param entities The entity manager to iterate through
*/
template<class Archive>
static void serializeEntities(Archive& archive,
bool save,
entityx::EntityManager& entities)
{
std::string name ("entity");
int i = 0;
for (auto entity : entities.entities_for_debugging()) {
archive.setNextName((name + std::to_string(i++)).c_str());
archive.startNode();
EntitySerializer::serialize(entities, entity, save, archive);
archive.finishNode();
}
}
};
#endif // GAMELOAD_HPP_
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