From eedee9dd9f7a2048598f95937d7688972911e3e4 Mon Sep 17 00:00:00 2001
From: sebastian <mail@sebastian.boeckelmann.de>
Date: Wed, 29 Jul 2026 19:03:48 +0200
Subject: [PATCH] ADD: ECS-System

---
 CMakeLists.txt                    |  6 +++
 engine/src/ecs/ComponentPool.cpp  |  5 +++
 engine/src/ecs/ComponentPool.h    | 45 ++++++++++++++++++++
 engine/src/ecs/Entity.cpp         |  5 +++
 engine/src/ecs/Entity.h           | 39 +++++++++++++++++
 engine/src/ecs/EntityRegistry.cpp |  5 +++
 engine/src/ecs/EntityRegistry.h   | 70 +++++++++++++++++++++++++++++++
 7 files changed, 175 insertions(+)
 create mode 100644 engine/src/ecs/ComponentPool.cpp
 create mode 100644 engine/src/ecs/ComponentPool.h
 create mode 100644 engine/src/ecs/Entity.cpp
 create mode 100644 engine/src/ecs/Entity.h
 create mode 100644 engine/src/ecs/EntityRegistry.cpp
 create mode 100644 engine/src/ecs/EntityRegistry.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f49df64..3510575 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -118,6 +118,12 @@ add_executable(ColorRace
         engine/src/renderer/shader/StaticShader.h
         engine/src/renderer/entities/Camera.cpp
         engine/src/renderer/entities/Camera.h
+        engine/src/ecs/EntityRegistry.cpp
+        engine/src/ecs/EntityRegistry.h
+        engine/src/ecs/Entity.cpp
+        engine/src/ecs/Entity.h
+        engine/src/ecs/ComponentPool.cpp
+        engine/src/ecs/ComponentPool.h
 
 )
 
diff --git a/engine/src/ecs/ComponentPool.cpp b/engine/src/ecs/ComponentPool.cpp
new file mode 100644
index 0000000..4a0e664
--- /dev/null
+++ b/engine/src/ecs/ComponentPool.cpp
@@ -0,0 +1,5 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#include "ComponentPool.h"
diff --git a/engine/src/ecs/ComponentPool.h b/engine/src/ecs/ComponentPool.h
new file mode 100644
index 0000000..6bfd6bb
--- /dev/null
+++ b/engine/src/ecs/ComponentPool.h
@@ -0,0 +1,45 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#ifndef COLORRACE_COMPONENTPOOL_H
+#define COLORRACE_COMPONENTPOOL_H
+#include "Entity.h"
+
+
+namespace engine {
+    class IComponentPool {
+    public:
+        virtual ~IComponentPool() = default;
+        virtual void remove(Entity entity) = 0;
+    };
+
+    template<typename T>
+    class ComponentPool : public IComponentPool {
+    public:
+        void remove(Entity entity) override {
+            m_components.erase(entity);
+        }
+
+        void insert(Entity entity, T component) {
+            m_components[entity] = std::move(component);
+        }
+
+        [[nodiscard]] bool has(Entity entity) const {
+            return m_components.contains(entity);
+        }
+
+        T& get(Entity entity) {
+            return m_components.at(entity);
+        }
+
+        // Für Iteration in Systemen
+        auto begin() { return m_components.begin(); }
+        auto end() { return m_components.end(); }
+
+    private:
+        std::unordered_map<Entity, T> m_components;
+    };
+}
+
+#endif //COLORRACE_COMPONENTPOOL_H
diff --git a/engine/src/ecs/Entity.cpp b/engine/src/ecs/Entity.cpp
new file mode 100644
index 0000000..338fdff
--- /dev/null
+++ b/engine/src/ecs/Entity.cpp
@@ -0,0 +1,5 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#include "Entity.h"
diff --git a/engine/src/ecs/Entity.h b/engine/src/ecs/Entity.h
new file mode 100644
index 0000000..082a81e
--- /dev/null
+++ b/engine/src/ecs/Entity.h
@@ -0,0 +1,39 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#ifndef COLORRACE_ENTITY_H
+#define COLORRACE_ENTITY_H
+#include <cstdint>
+#include <limits>
+#include <functional> // <- das hier fehlt vermutlich
+
+namespace engine {
+    class Entity {
+    public:
+        constexpr Entity() noexcept = default;
+        constexpr explicit Entity(std::uint32_t id) noexcept : m_id(id) {}
+
+        [[nodiscard]] constexpr std::uint32_t value() const noexcept { return m_id; }
+
+        constexpr bool operator==(const Entity&) const = default;
+
+        static constexpr Entity null() noexcept {
+            return Entity{std::numeric_limits<std::uint32_t>::max()};
+        }
+
+    private:
+        std::uint32_t m_id = std::numeric_limits<std::uint32_t>::max();
+    };
+}
+
+// Damit Entity in unordered_map als Key funktioniert
+template<>
+struct std::hash<engine::Entity> {
+    std::size_t operator()(const engine::Entity& e) const noexcept {
+        return std::hash<std::uint32_t>{}(e.value());
+    }
+};
+
+
+#endif //COLORRACE_ENTITY_H
diff --git a/engine/src/ecs/EntityRegistry.cpp b/engine/src/ecs/EntityRegistry.cpp
new file mode 100644
index 0000000..aaf1162
--- /dev/null
+++ b/engine/src/ecs/EntityRegistry.cpp
@@ -0,0 +1,5 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#include "EntityRegistry.h"
diff --git a/engine/src/ecs/EntityRegistry.h b/engine/src/ecs/EntityRegistry.h
new file mode 100644
index 0000000..d7fe834
--- /dev/null
+++ b/engine/src/ecs/EntityRegistry.h
@@ -0,0 +1,70 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#ifndef COLORRACE_ENTITYREGISTRY_H
+#define COLORRACE_ENTITYREGISTRY_H
+#include <cstdint>
+#include <memory>
+#include <typeindex>
+#include <unordered_map>
+
+#include "ComponentPool.h"
+
+
+namespace engine {
+    class EntityRegistry {
+    public:
+        Entity createEntity() {
+            return Entity{m_nextId++};
+        }
+        
+        void destroyEntity(Entity entity) {
+            for (auto& [type, pool] : m_pools) {
+                pool->remove(entity);
+            }
+        }
+
+
+        template<typename T>
+        void addComponent(Entity entity, T component) {
+            getPool<T>().insert(entity, std::move(component));
+        }
+
+        template<typename T>
+        void removeComponent(Entity entity) {
+            getPool<T>().remove(entity);
+        }
+
+        template<typename T>
+        [[nodiscard]] bool hasComponent(Entity entity) {
+            auto key = std::type_index(typeid(T));
+            auto it = m_pools.find(key);
+            if (it == m_pools.end()) return false;
+            return static_cast<ComponentPool<T>&>(*it->second).has(entity);
+        }
+
+        template<typename T>
+        T& getComponent(Entity entity) {
+            return getPool<T>().get(entity);
+        }
+
+        template<typename T>
+        ComponentPool<T>& getPool() {
+            auto key = std::type_index(typeid(T));
+            auto it = m_pools.find(key);
+            if (it == m_pools.end()) {
+                auto pool = std::make_unique<ComponentPool<T>>();
+                auto* ptr = pool.get();
+                m_pools.emplace(key, std::move(pool));
+                return *ptr;
+            }
+            return static_cast<ComponentPool<T>&>(*it->second);
+        }
+    private:
+        std::uint32_t m_nextId = 0;
+        std::pmr::unordered_map<std::type_index, std::unique_ptr<IComponentPool>> m_pools;
+    };
+}
+
+#endif //COLORRACE_ENTITYREGISTRY_H