87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
/*
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* SPDX-FileCopyrightText: Dora "cat" <cat@thenight.club>
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* SPDX-License-Identifier: MPL-2.0
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*
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* This Source Code Form is subject to the terms of the Mozilla Public License,
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* v. 2.0. If a copy of the MPL was not distributed with this file, You can
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* obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef GUARD_TOURMALINE_ECS_H
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#define GUARD_TOURMALINE_ECS_H
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#include <any>
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#include <typeindex>
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#include "../Containers/DualkeyMap.hpp"
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#include "../Containers/Hashmap.hpp"
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#include "../Types.hpp"
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#include "ECS/BuiltinComponents.hpp"
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#include "Logging.hpp"
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namespace Tourmaline::Systems::ECS {
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using Entity = Tourmaline::Type::UUID;
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using System = Tourmaline::Type::UUID;
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class World {
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public:
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World() {}
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// ====== World controls ======
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void Step();
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// ======== Entities ========
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[[nodiscard]]
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Entity CreateEntity();
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[[nodiscard("Pointless call of EntityExists")]]
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bool EntityExists(const Entity &entity) noexcept;
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bool DestroyEntity(Entity entity);
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// ======== Components ========
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template <isAComponent Component, typename... ComponentArgs>
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Component &AddComponent(const Entity &entity, ComponentArgs &&...args) {
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auto newComponent = entityComponentMap.Insert(entity, typeid(Component),
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Component(args...));
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return std::any_cast<Component &>(std::get<2>(newComponent));
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}
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template <isAComponent Component>
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[[nodiscard("Pointless call of GetComponent")]]
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Component &GetComponent(const Entity &entity) {
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auto result = entityComponentMap.Query(entity, typeid(Component));
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if (result.empty()) {
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Logging::LogFormatted("Entity {} does not have component {}!",
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"ECS/GetComponent", Logging::LogLevel::Error,
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entity.asString(), typeid(Component).name());
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}
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return std::any_cast<Component &>(result.begin()->second);
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}
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template <isAComponent Component>
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[[nodiscard("Pointless call of HasComponent")]]
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bool HasComponent(const Entity &entity) {
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return entityComponentMap.Query(entity, typeid(Component)).size();
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}
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template <isAComponent Component> bool RemoveComponent(const Entity &entity) {
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return entityComponentMap.Remove(entity, typeid(Component));
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}
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// Copying is not allowed since the ECS world is meant to be
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// a session with its own private session sensitive variables
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World(const World &) = delete;
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World &operator=(const World &) = delete;
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private:
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using systemFunction =
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std::function<void(const Entity &, std::span<std::any *>)>;
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Containers::DualkeyMap<Entity, std::type_index, std::any>
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entityComponentMap{};
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Containers::Hashmap<System, systemFunction> registeredSystems{};
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// ======== Life-cycle ========
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void preSystems();
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void postSystems();
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};
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} // namespace Tourmaline::Systems::ECS
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#endif
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