atdunbg
394bfd3d0c
- 新增 EntityHandle：e.AddComponent<T>() / e.GetComponent<T>() / e.Destroy() / e.GetUUID()，转发 entt registry，零存储开销 - Scene::CreateEntity 返回 EntityHandle；Scene 层组件接口保留 （给渲染器/系统批量遍历用） - 语义分层：应用层"实体管组件"（句柄表皮）， 数据层组件存储仍集中在 registry（ECS 性能根基）
65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
//
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// Created by atdunbg on 2026/9/22.
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//
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#include <Engine/ECS/Scene.h>
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#include <Engine/ECS/EntityHandle.h>
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#include <Engine/Core/Log.h>
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namespace Engine::ECS {
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EntityHandle Scene::CreateEntity(std::string name)
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{
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Entity e = m_Registry.create();
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// IdComponent 自动挂载：每个实体出生即有稳定 UUID
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m_Registry.emplace<IdComponent>(e, IdComponent{UUID::New()});
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if (!name.empty()) {
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m_Registry.emplace<NameComponent>(e, NameComponent{std::move(name)});
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}
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return EntityHandle{this, e};
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}
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Entity Scene::FindEntityByUUID(UUID uuid)
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{
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if (!uuid.Valid()) return entt::null;
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Entity found = entt::null;
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m_Registry.view<IdComponent>().each([&](Entity e, IdComponent& id) {
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if (found == entt::null && id.uuid == uuid) found = e;
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});
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return found;
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}
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void Scene::DestroyEntity(Entity e)
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{
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if (!m_Registry.valid(e)) {
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ENGINE_FATAL("Scene::DestroyEntity: stale entity ({})",
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static_cast<u32>(e));
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}
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// 延迟到帧尾，保证遍历期间池结构不变
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m_PendingDestroy.push_back(e);
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}
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void Scene::FlushDestroyQueue()
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{
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if (m_PendingDestroy.empty()) return;
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for (Entity e : m_PendingDestroy) {
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if (m_Registry.valid(e)) {
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m_Registry.destroy(e); // entt 自动回收槽位并递增版本号
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}
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}
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m_PendingDestroy.clear();
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}
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CameraComponent* Scene::GetPrimaryCamera()
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{
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CameraComponent* found = nullptr;
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m_Registry.view<CameraComponent>().each([&](Entity, CameraComponent& cc) {
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if (!found && cc.primary) found = &cc;
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});
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return found;
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}
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} // namespace Engine::ECS
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