ComponentRegistrar.hpp

#pragma once
 
#include <unordered_map>
#include <string>
#include <entt/entt.hpp>
 
#include <EngineCore/ECS/EntityHandle.hpp>
#include <EngineCore/Reflection/ComponentReflection.hpp>
#include <EngineCore/WorldContext/WorldContextManager.hpp>
#include <Common/HashedString.hpp>
 
#include "ComponentFunctions.hpp"
#include "ComponentFunctionsDefinitions.hpp"
 
using namespace Grindstone;
 
namespace Grindstone::ECS {
    class ComponentRegistrar {
    public:
        template<typename ComponentType>
        void RegisterComponent() {
            SetupComponentFn setupComponentFn = nullptr;
            if constexpr (HasConstruct<ComponentType>) {
                setupComponentFn = ComponentType::Construct;
            }
 
            DestroyComponentFn destroyComponentFn = nullptr;
            if constexpr (HasDestroy<ComponentType>) {
                destroyComponentFn = ComponentType::Destroy;
            }
 
            RegisterComponent(
                ComponentType::GetComponentHashString(),
                ComponentFunctions{
                    setupComponentFn,
                    destroyComponentFn,
                    &ECS::ClearComponents<ComponentType>,
                    &ECS::CreateComponent<ComponentType>,
                    &ECS::RemoveComponent<ComponentType>,
                    &ECS::HasComponent<ComponentType>,
                    &ECS::TryGetComponent<ComponentType>,
                    &ECS::GetComponentReflectionData<ComponentType>,
                    &ECS::CopyRegistryComponents<ComponentType>
                }
            );
        }
 
        template<typename ComponentType>
        void UnregisterComponent() {
            Grindstone::EngineCore& engineCore = Grindstone::EngineCore::GetInstance();
            Grindstone::WorldContextManager* worldContextManager = engineCore.GetWorldContextManager();
            if (worldContextManager != nullptr) {
                for (auto& worldContext : *worldContextManager) {
                    entt::registry& registry = worldContext->GetEntityRegistry();
                    registry.clear<ComponentType>();
                }
            }
 
            auto comp = componentFunctionsList.find(ComponentType::GetComponentHashString());
            if (comp != componentFunctionsList.end()) {
                componentFunctionsList.erase(comp);
            }
        }
 
        virtual void CopyRegistry(WorldContextSet& to, WorldContextSet& from);
        virtual void CallCreateOnRegistry(WorldContextSet& worldContextSet);
        virtual void CallDestroyOnRegistry(WorldContextSet& worldContextSet);
        virtual void DestroyEntity(ECS::Entity entity);
        virtual void RegisterComponent(Grindstone::HashedString name, ComponentFunctions componentFunctions);
        virtual void UnregisterComponent(Grindstone::HashedString name);
        virtual void* CreateComponentWithSetup(Grindstone::HashedString name, ECS::Entity entity);
        virtual void* CreateComponentWithSetup(WorldContextSet& worldContextSet, Grindstone::HashedString name, ECS::Entity entity);
        virtual void* CreateComponent(Grindstone::HashedString name, ECS::Entity entity);
        virtual void RemoveComponent(Grindstone::HashedString name, ECS::Entity entity);
        virtual bool HasComponent(Grindstone::HashedString name, ECS::Entity entity);
        virtual bool TryGetComponent(Grindstone::HashedString name, ECS::Entity entity, void*& outComponent);
        virtual bool TryGetComponentReflectionData(Grindstone::HashedString name, Grindstone::Reflection::TypeDescriptor_Struct& outReflectionData);
        virtual void SetupComponent(Grindstone::HashedString componentType, ECS::Entity entity, void* componentPtr);
        virtual void SetupComponent(WorldContextSet& worldContextSet, Grindstone::HashedString componentType, ECS::Entity entity, void* componentPtr);
 
        using ComponentMap = std::unordered_map<Grindstone::HashedString, ComponentFunctions>;
        virtual ComponentMap::iterator begin();
        virtual ComponentMap::const_iterator begin() const;
        virtual ComponentMap::iterator end();
        virtual ComponentMap::const_iterator end() const;
    private:
        ComponentMap componentFunctionsList;
    };
}