SceneSerialization.h

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#pragma once
 
#include "ncengine/asset/NcAsset.h"
#include "ncengine/ecs/Ecs.h"
#include "ncengine/module/ModuleProvider.h"
 
#include <iosfwd>
 
namespace nc
{
constexpr auto g_sceneFragmentMagicNumber = 0x3ff0e17b;
 
constexpr auto g_currentSceneFragmentVersion = 3u;
 
struct SceneFragmentHeader
{
    uint32_t magicNumber = g_sceneFragmentMagicNumber;
    uint32_t version = g_currentSceneFragmentVersion;
};
 
using EntityToFragmentIdMap = std::unordered_map<Entity, uint32_t, Entity::Hash>;
 
using FragmentIdToEntityMap = std::unordered_map<uint32_t, Entity>;
 
struct SerializationContext
{
    EntityToFragmentIdMap entityMap;
    ecs::Ecs ecs;
};
 
struct DeserializationContext
{
    FragmentIdToEntityMap entityMap;
    ecs::Ecs ecs;
};
 
void SaveSceneFragment(std::ostream& stream,
                       ecs::Ecs ecs,
                       const asset::AssetMap& assets,
                       std::move_only_function<bool(Entity)> entityFilter = nullptr);
 
void LoadSceneFragment(std::istream& stream,
                       ecs::Ecs ecs,
                       ModuleProvider modules);
} // namespace nc