feat? add basich ah scene loading

destrum/CMakeLists.txt

@@ -53,6 +53,9 @@ set(SRC_FILES
         "src/FS/AssetFS.cpp"
         "src/FS/Manifest.cpp"
 
+        "src/Serialization/SceneSerializer.cpp"
+        "src/Serialization/ComponentRegistry.cpp"
+
         "src/Util/DeltaTime.cpp"
 
         "src/Physics/PhysicsWorld.cpp"

destrum/include/destrum/Components/Animator.h

@@ -19,6 +19,10 @@ public:
     explicit Animator(GameObject& parent);
 
     void Update() override;
+    std::string GetTypeName() const override
+    {
+        return "Animator";
+    }
     void ImGuiInspector() override;
 
     void addClip(std::shared_ptr<SkeletalAnimation> clip);

destrum/include/destrum/Components/MeshRendererComponent.h

@@ -18,6 +18,11 @@ public:
 
     void SetMaterialID(MaterialID id) { materialID = id; }
     MaterialID GetMaterialID() const { return materialID; }
+    std::string GetTypeName() const override
+    {
+        return "MeshRendererComponent";
+    }
+
 private:
     MeshID meshID{NULL_MESH_ID};
     MaterialID materialID{NULL_MATERIAL_ID};

destrum/include/destrum/Components/Physics/BoxCollider.h

@@ -11,6 +11,11 @@ public:
 
     void Update() override {}
 
+    std::string GetTypeName() const override
+    {
+        return "BoxCollider";
+    }
+
 
     [[nodiscard]] PhysicsShapeDesc BuildPhysicsShape() const override {
         return PhysicsShapeDesc::Box(m_HalfExtents, m_CenterOffset, m_IsTrigger);

destrum/include/destrum/Components/Physics/Rigidbody.h

@@ -16,6 +16,11 @@ public:
 
     void Update() override {}
 
+    std::string GetTypeName() const override
+    {
+        return "RigidBody";
+    }
+
     void AttachPhysicsBody(PhysicsWorld* world, PhysicsBodyHandle body);
     void DetachPhysicsBody();
 

destrum/include/destrum/Components/Physics/SphereCollider.h

@@ -11,6 +11,10 @@ public:
         , m_Radius(radius) {}
 
     void Update() override {}
+    std::string GetTypeName() const override
+    {
+        return "SphereCollider";
+    }
 
     [[nodiscard]] PhysicsShapeDesc BuildPhysicsShape() const override {
         return PhysicsShapeDesc::Sphere(m_Radius, m_CenterOffset, m_IsTrigger);

destrum/include/destrum/ObjectModel/Component.h

@@ -1,14 +1,21 @@
 #ifndef COMPONENT_H
 #define COMPONENT_H
 
+#include <string>
+#include <unordered_map>
+
+#include <nlohmann/json.hpp>
+
 #include <destrum/Graphics/RenderContext.h>
 #include <destrum/ObjectModel/Object.h>
+#include <destrum/ObjectModel/ObjectId.h>
 
 class GameObject;
 class Transform;
 
-class Component: public Object {
+class Component : public Object {
 public:
+    using ObjectMap = std::unordered_map<ObjectId, GameObject*>;
 
     ~Component() override = default;
 
@@ -18,30 +25,44 @@ public:
     Component& operator=(Component&& other) noexcept = delete;
 
     [[nodiscard]] bool isEnabled() const { return m_IsEnabled; }
-    [[nodiscard]] GameObject *GetGameObject() const { return m_ParentGameObjectPtr; }
+    [[nodiscard]] GameObject* GetGameObject() const { return m_ParentGameObjectPtr; }
     [[nodiscard]] Transform& GetTransform() const;
 
     void Destroy() override;
+
     virtual void Start();
     virtual void SetEnabled(bool enabled);
+
     virtual void Update() = 0;
     virtual void LateUpdate();
     virtual void FixedUpdate();
-    virtual void ImGuiInspector(); //Specifically for the inspector
-    virtual void ImGuiRender();
 
+    virtual void ImGuiInspector();
+    virtual void ImGuiRender();
 
     virtual void Render(const RenderContext& ctx);
 
+    // Serialization.
+    virtual std::string GetTypeName() const = 0;
+
+    virtual nlohmann::json Serialize() const {
+        return {};
+    }
+
+    virtual void Deserialize(const nlohmann::json& data) {
+    }
+
+    virtual void ResolveReferences(const ObjectMap& objects) {
+    }
 
     bool HasStarted{false};
+
 protected:
     explicit Component(GameObject& pParent, const std::string& name = "Component");
 
 private:
     GameObject* m_ParentGameObjectPtr{};
     bool m_IsEnabled{true};
-
 };
 
-#endif //COMPONENT_H
+#endif // COMPONENT_H

destrum/include/destrum/ObjectModel/GameObject.h

@@ -1,14 +1,17 @@
 #pragma once
+
 #include <memory>
 #include <vector>
+#include <algorithm>
 
 #include <destrum/ObjectModel/Component.h>
 #include <destrum/ObjectModel/Object.h>
+#include <destrum/ObjectModel/ObjectId.h>
 #include <destrum/ObjectModel/Transform.h>
 
 class Scene;
 
-class GameObject final: public Object {
+class GameObject final : public Object {
 public:
     friend class Scene;
 
@@ -31,14 +34,28 @@ public:
         SetActiveDirty();
     }
 
-    [[nodiscard]] std::vector<std::unique_ptr<Component>>& GetComponents() { return m_Components; }
+    [[nodiscard]] bool IsActive() const { return m_Active; }
+
+    [[nodiscard]] ObjectId GetId() const { return m_Id; }
+
+    // Use this only while loading a scene.
+    void SetIdForDeserialization(ObjectId id);
+
+    [[nodiscard]] Scene* GetScene() const { return m_Scene; }
+
+    [[nodiscard]] std::vector<std::unique_ptr<Component>>& GetComponents() {
+        return m_Components;
+    }
+
+    [[nodiscard]] const std::vector<std::unique_ptr<Component>>& GetComponents() const {
+        return m_Components;
+    }
 
     [[nodiscard]] Transform& GetTransform() { return m_TransformPtr; }
+    [[nodiscard]] const Transform& GetTransform() const { return m_TransformPtr; }
 
     [[nodiscard]] bool IsActiveInHierarchy();
 
-    [[nodiscard]] bool IsActive() const { return m_Active; }
-
     explicit GameObject(const std::string& name = "GameObject");
     ~GameObject() override;
 
@@ -57,20 +74,30 @@ public:
         return static_cast<TComponent*>(addedComponent.get());
     }
 
-    template <typename Component>
+    template <typename TComponent>
-    [[nodiscard]] Component *GetComponent() {
+    [[nodiscard]] TComponent* GetComponent() {
-        for (const auto& component: m_Components) {
+        for (const auto& component : m_Components) {
-            if (auto casted = dynamic_cast<Component*>(component.get())) {
+            if (auto casted = dynamic_cast<TComponent*>(component.get())) {
                 return casted;
             }
         }
         return nullptr;
     }
 
-    template <typename Component>
+    template <typename TComponent>
-    Component *DestroyComponent() {
+    [[nodiscard]] const TComponent* GetComponent() const {
-        for (const auto& component: m_Components) {
+        for (const auto& component : m_Components) {
-            if (auto casted = dynamic_cast<Component*>(component.get())) {
+            if (auto casted = dynamic_cast<const TComponent*>(component.get())) {
+                return casted;
+            }
+        }
+        return nullptr;
+    }
+
+    template <typename TComponent>
+    TComponent* DestroyComponent() {
+        for (const auto& component : m_Components) {
+            if (auto casted = dynamic_cast<TComponent*>(component.get())) {
                 casted->Destroy();
                 return casted;
             }
@@ -78,40 +105,50 @@ public:
         return nullptr;
     }
 
-    template <typename Component>
+    template <typename TComponent>
-    [[nodiscard]] bool HasComponent() {
+    [[nodiscard]] bool HasComponent() const {
-        for (const auto& component: m_Components) {
+        for (const auto& component : m_Components) {
-            if (auto casted = dynamic_cast<Component*>(component.get())) {
+            if (dynamic_cast<TComponent*>(component.get())) {
                 return true;
             }
         }
         return false;
     }
 
-    template <typename Component>
+    template <typename TComponent>
-    Component *GetComponentInChildren() {
+    TComponent* GetComponentInChildren() {
-        return GetComponentInChildrenRecursive<Component>(&GetTransform());
+        return GetComponentInChildrenRecursive<TComponent>(&GetTransform());
     }
 
 private:
-    template <typename Component>
+    template <typename TComponent>
-    static Component *GetComponentInChildrenRecursive(Transform* transform) {
+    static TComponent* GetComponentInChildrenRecursive(Transform* transform) {
         if (!transform) return nullptr;
+
         GameObject* owner = transform->GetOwner();
         if (owner) {
-            if (Component* comp = owner->GetComponent<Component>()) {
+            if (TComponent* comp = owner->GetComponent<TComponent>()) {
                 return comp;
             }
         }
-        for (Transform* child: transform->GetChildren()) {
+
-            if (Component* found = GetComponentInChildrenRecursive<Component>(child)) {
+        for (Transform* child : transform->GetChildren()) {
+            if (TComponent* found = GetComponentInChildrenRecursive<TComponent>(child)) {
                 return found;
             }
         }
+
         return nullptr;
     }
 
+    void SetScene(Scene* scene) { m_Scene = scene; }
+
     void SetActiveDirty();
+    void UpdateActiveState();
+
+    inline static ObjectId s_NextId{1};
+
+    ObjectId m_Id{InvalidObjectId};
 
     bool m_Active{true};
     Scene* m_Scene{};
@@ -119,6 +156,5 @@ private:
     std::vector<std::unique_ptr<Component>> m_Components{};
 
     bool m_ActiveDirty{true};
-    bool m_ActiveInHierarchy{true}; //Derived
+    bool m_ActiveInHierarchy{true};
-    void UpdateActiveState();
 };

destrum/include/destrum/ObjectModel/ObjectId.h

@@ -0,0 +1,10 @@
+#ifndef DESTRUM_OBJECTID_H
+#define DESTRUM_OBJECTID_H
+
+#include <cstdint>
+
+using ObjectId = std::uint64_t;
+
+inline constexpr ObjectId InvalidObjectId = 0;
+
+#endif //DESTRUM_OBJECTID_H

destrum/include/destrum/Scene/Scene.h

@@ -35,6 +35,12 @@ public:
 
     [[nodiscard]] bool IsBeingUnloaded() const { return m_BeingUnloaded; }
 
+    void CommitPendingAdditions();
+
+    [[nodiscard]] const std::vector<std::shared_ptr<GameObject>>& GetObjects() const {
+        return m_objects;
+    }
+
     void SetRegisterBindings(std::function<void()> registerBindings) {
         m_registerBindings = std::move(registerBindings);
     }

destrum/include/destrum/Serialization/ComponentFactory.h

@@ -0,0 +1,37 @@
+#ifndef DESTRUM_COMPONENTFACTORY_H
+#define DESTRUM_COMPONENTFACTORY_H
+
+#include <functional>
+#include <memory>
+#include <string>
+#include <unordered_map>
+
+#include <destrum/ObjectModel/Component.h>
+#include <destrum/ObjectModel/GameObject.h>
+
+class ComponentFactory final {
+public:
+    using CreateFn = std::function<Component*(GameObject&)>;
+
+    static void Register(const std::string& typeName, CreateFn createFn) {
+        Registry()[typeName] = std::move(createFn);
+    }
+
+    static Component* Create(const std::string& typeName, GameObject& owner) {
+        const auto it = Registry().find(typeName);
+
+        if (it == Registry().end()) {
+            return nullptr;
+        }
+
+        return it->second(owner);
+    }
+
+private:
+    static std::unordered_map<std::string, CreateFn>& Registry() {
+        static std::unordered_map<std::string, CreateFn> registry;
+        return registry;
+    }
+};
+
+#endif //DESTRUM_COMPONENTFACTORY_H

destrum/include/destrum/Serialization/ComponentRegistry.h

@@ -0,0 +1,6 @@
+#ifndef DESTRUM_COMPONENTREGISTRY_H
+#define DESTRUM_COMPONENTREGISTRY_H
+
+void RegisterEngineComponents();
+
+#endif //DESTRUM_COMPONENTREGISTRY_H

destrum/include/destrum/Serialization/SceneSerializer.h

@@ -0,0 +1,14 @@
+#ifndef DESTRUM_SCENESERIALIZER_H
+#define DESTRUM_SCENESERIALIZER_H
+
+#include <filesystem>
+
+class Scene;
+
+class SceneSerializer final {
+public:
+    static bool Save(Scene& scene, const std::filesystem::path& path);
+    static bool Load(Scene& scene, const std::filesystem::path& path);
+};
+
+#endif //DESTRUM_SCENESERIALIZER_H

destrum/src/ObjectModel/Component.cpp

@@ -2,13 +2,10 @@
 
 #include <stdexcept>
 #include <destrum/ObjectModel/GameObject.h>
-// #include "imgui.h"
 
-Component::Component(GameObject& pParent, const std::string& name): Object(name), m_ParentGameObjectPtr(&pParent) {
+Component::Component(GameObject& pParent, const std::string& name)
-    // if (m_ParentGameObjectPtr == nullptr) {
+    : Object(name),
-    //     //TODO: Change pParent ot be a reference
+      m_ParentGameObjectPtr(&pParent) {
-    //     throw std::runtime_error("Component made with no GameObject??");
-    // }
 }
 
 Transform& Component::GetTransform() const {
@@ -16,7 +13,6 @@ Transform& Component::GetTransform() const {
 }
 
 void Component::Destroy() {
-    // const bool isBeingDestroyed = GetIsBeingDestroyed();
     Object::Destroy();
 }
 
@@ -40,5 +36,4 @@ void Component::ImGuiRender() {
 }
 
 void Component::Render(const RenderContext& ctx) {
-
 }

destrum/src/ObjectModel/GameObject.cpp

@@ -1,18 +1,30 @@
 #include <destrum/ObjectModel/GameObject.h>
 #include <string>
-
 #include <iostream>
 
 #include "spdlog/spdlog.h"
 
-// #include "Managers/ResourceManager.h"
-
 GameObject::~GameObject() {
     // spdlog::debug("GameObject destroyed: {}", GetName());
 }
 
+GameObject::GameObject(const std::string& name)
+    : Object(name),
+      m_Id(s_NextId++) {
+}
+
+void GameObject::SetIdForDeserialization(ObjectId id) {
+    m_Id = id;
+
+    // Prevent newly created objects from reusing loaded IDs.
+    if (id >= s_NextId) {
+        s_NextId = id + 1;
+    }
+}
+
 void GameObject::SetActiveDirty() {
     m_ActiveDirty = true;
+
     for (const Transform* child : m_TransformPtr.GetChildren()) {
         child->GetOwner()->SetActiveDirty();
     }
@@ -21,7 +33,7 @@ void GameObject::SetActiveDirty() {
 void GameObject::UpdateActiveState() {
     const auto* parentPtr = m_TransformPtr.GetParent();
 
-    if(parentPtr == nullptr) {
+    if (parentPtr == nullptr) {
         m_ActiveInHierarchy = m_Active;
     } else {
         m_ActiveInHierarchy = m_Active && parentPtr->GetOwner()->IsActiveInHierarchy();
@@ -38,49 +50,51 @@ bool GameObject::IsActiveInHierarchy() {
     return m_ActiveInHierarchy;
 }
 
-GameObject::GameObject(const std::string& name): Object(name) {
-}
-
 void GameObject::Update() {
-    for (const auto& component: m_Components) {
+    for (const auto& component : m_Components) {
+        if (!component->isEnabled()) {
+            continue;
+        }
+
         if (!component->HasStarted) {
             component->Start();
             component->HasStarted = true;
         }
+
         component->Update();
     }
 }
 
 void GameObject::LateUpdate() {
-    for (const auto& component: m_Components) {
+    for (const auto& component : m_Components) {
-        component->LateUpdate();
+        if (component->isEnabled()) {
+            component->LateUpdate();
+        }
     }
 }
 
 void GameObject::FixedUpdate() {
-    for (const auto& component: m_Components) {
+    for (const auto& component : m_Components) {
-        component->FixedUpdate();
+        if (component->isEnabled()) {
+            component->FixedUpdate();
+        }
     }
 }
 
 void GameObject::Render(const RenderContext& ctx) const {
-    for (const auto& component: m_Components) {
+    for (const auto& component : m_Components) {
-        component->Render(ctx);
+        if (component->isEnabled()) {
+            component->Render(ctx);
+        }
     }
 }
 
-// void GameObject::ImGuiRender() {
-//     for (const auto& component: m_Components) {
-//         component->ImGuiRender();
-//     }
-// }
-
 void GameObject::Destroy() {
     Object::Destroy();
 
     m_TransformPtr.SetParent(nullptr);
 
-    for (const auto& component: m_Components) {
+    for (const auto& component : m_Components) {
         component->Destroy();
     }
 

destrum/src/Scene/Scene.cpp

@@ -32,7 +32,7 @@ GameObject* Scene::CreateGameObject(std::string name)
 
     GameObject* rawPtr = obj.get();
 
-    // obj->SetScene(this);
+    obj->SetScene(this);
     m_pendingAdditions.emplace_back(std::move(obj));
 
     return rawPtr;
@@ -61,15 +61,9 @@ void Scene::Load() {
 }
 
 void Scene::Update() {
-    if (!m_pendingAdditions.empty()) {
+    CommitPendingAdditions();
-        for (auto& obj : m_pendingAdditions) {
-            m_objects.emplace_back(std::move(obj));
-        }
-        m_pendingAdditions.clear();
-    }
 
-
+    for (const auto& object : m_objects) {
-    for (const auto& object: m_objects) {
         if (object->IsActiveInHierarchy()) {
             object->Update();
         }
@@ -155,3 +149,15 @@ void Scene::DestroyGameObjects() {
         assert(m_BeingUnloaded && "Scene is being cleared but not unloaded? Weird");
     }
 }
+
+void Scene::CommitPendingAdditions() {
+    if (m_pendingAdditions.empty()) {
+        return;
+    }
+
+    for (auto& obj : m_pendingAdditions) {
+        m_objects.emplace_back(std::move(obj));
+    }
+
+    m_pendingAdditions.clear();
+}

destrum/src/Serialization/ComponentRegistry.cpp

@@ -0,0 +1,56 @@
+// destrum/Serialization/ComponentRegistry.cpp
+
+#include <destrum/Serialization/ComponentRegistry.h>
+#include <destrum/Serialization/ComponentFactory.h>
+
+#include <destrum/Components/MeshRendererComponent.h>
+#include <destrum/Components/Rotator.h>
+#include <destrum/Components/Spinner.h>
+#include <destrum/Components/OrbitAndSpin.h>
+#include <destrum/Components/Animator.h>
+
+#include <destrum/Components/Physics/Rigidbody.h>
+#include <destrum/Components/Physics/BoxCollider.h>
+#include <destrum/Components/Physics/SphereCollider.h>
+
+void RegisterEngineComponents()
+{
+    static bool registered = false;
+    if (registered) {
+        return;
+    }
+
+    registered = true;
+
+    ComponentFactory::Register("MeshRenderer", [](GameObject& owner) {
+        return owner.AddComponent<MeshRendererComponent>();
+    });
+
+    // ComponentFactory::Register("Rotator", [](GameObject& owner) {
+        // return owner.AddComponent<Rotator>();
+    // });
+
+    // ComponentFactory::Register("Spinner", [](GameObject& owner) {
+        // return owner.AddComponent<Spinner>();
+    // });
+
+    // ComponentFactory::Register("OrbitAndSpin", [](GameObject& owner) {
+        // return owner.AddComponent<OrbitAndSpin>();
+    // });
+
+    ComponentFactory::Register("Animator", [](GameObject& owner) {
+        return owner.AddComponent<Animator>();
+    });
+
+    ComponentFactory::Register("Rigidbody", [](GameObject& owner) {
+        return owner.AddComponent<Rigidbody>();
+    });
+
+    ComponentFactory::Register("BoxCollider", [](GameObject& owner) {
+        return owner.AddComponent<BoxCollider>();
+    });
+
+    ComponentFactory::Register("SphereCollider", [](GameObject& owner) {
+        return owner.AddComponent<SphereCollider>();
+    });
+}

destrum/src/Serialization/SceneSerializer.cpp

@@ -0,0 +1,223 @@
+#include <destrum/Serialization/SceneSerializer.h>
+
+#include <fstream>
+#include <iostream>
+#include <unordered_map>
+#include <vector>
+
+#include <nlohmann/json.hpp>
+
+#include <destrum/Scene/Scene.h>
+#include <destrum/ObjectModel/GameObject.h>
+#include <destrum/ObjectModel/Component.h>
+#include <destrum/ObjectModel/ObjectId.h>
+#include <destrum/Serialization/ComponentFactory.h>
+
+using json = nlohmann::json;
+
+bool SceneSerializer::Save(Scene& scene, const std::filesystem::path& path) {
+    scene.CommitPendingAdditions();
+
+    json root;
+
+    root["version"] = 1;
+    root["name"] = scene.GetName();
+    root["objects"] = json::array();
+
+    for (const auto& objectPtr : scene.GetObjects()) {
+        if (!objectPtr) {
+            continue;
+        }
+
+        const GameObject& object = *objectPtr;
+
+        json objectJson;
+        objectJson["id"] = object.GetId();
+        objectJson["name"] = object.GetName();
+        objectJson["active"] = object.IsActive();
+
+        // Transform should be saved separately because in your engine it is not a component.
+        // Replace this with your actual Transform getters.
+        objectJson["transform"] = {
+            // Example:
+            // { "position", { object.GetTransform().GetLocalPosition().x,
+            //                 object.GetTransform().GetLocalPosition().y,
+            //                 object.GetTransform().GetLocalPosition().z } },
+            // { "rotation", { ... } },
+            // { "scale",    { ... } }
+        };
+
+        const Transform* parent = object.GetTransform().GetParent();
+        objectJson["parent"] = parent
+            ? parent->GetOwner()->GetId()
+            : InvalidObjectId;
+
+        objectJson["components"] = json::array();
+
+        for (const auto& componentPtr : object.GetComponents()) {
+            if (!componentPtr) {
+                continue;
+            }
+
+            const Component& component = *componentPtr;
+
+            json componentJson;
+            componentJson["type"] = component.GetTypeName();
+            componentJson["enabled"] = component.isEnabled();
+            componentJson["data"] = component.Serialize();
+
+            objectJson["components"].push_back(componentJson);
+        }
+
+        root["objects"].push_back(objectJson);
+    }
+
+    std::ofstream file(path);
+    if (!file.is_open()) {
+        std::cerr << "Failed to open scene file for writing: " << path << '\n';
+        return false;
+    }
+
+    file << root.dump(4);
+    return true;
+}
+
+bool SceneSerializer::Load(Scene& scene, const std::filesystem::path& path) {
+    std::ifstream file(path);
+    if (!file.is_open()) {
+        std::cerr << "Failed to open scene file for reading: " << path << '\n';
+        return false;
+    }
+
+    json root;
+
+    try {
+        file >> root;
+    } catch (const std::exception& e) {
+        std::cerr << "Failed to parse scene file: " << e.what() << '\n';
+        return false;
+    }
+
+    scene.RemoveAll();
+
+    std::unordered_map<ObjectId, GameObject*> idMap;
+    std::vector<const json*> objectJsonList;
+
+    try {
+        const auto& objectsJson = root.at("objects");
+
+        // Pass 1:
+        // Create all GameObjects first.
+        for (const auto& objectJson : objectsJson) {
+            const auto id = objectJson.at("id").get<ObjectId>();
+            const std::string name = objectJson.value("name", "GameObject");
+            const bool active = objectJson.value("active", true);
+
+            GameObject* object = scene.CreateGameObject(name);
+            object->SetIdForDeserialization(id);
+            object->SetActive(active);
+
+            idMap[id] = object;
+            objectJsonList.push_back(&objectJson);
+        }
+
+        scene.CommitPendingAdditions();
+
+        // Pass 2:
+        // Restore transforms and parent-child hierarchy.
+        for (const json* objectJson : objectJsonList) {
+            const auto id = objectJson->at("id").get<ObjectId>();
+
+            GameObject* object = idMap.at(id);
+
+            // Replace this with your actual Transform deserialization.
+            if (objectJson->contains("transform")) {
+                const json& transformJson = objectJson->at("transform");
+
+                auto position = transformJson.at("position");
+                object->GetTransform().SetLocalPosition({
+                    position[0].get<float>(),
+                    position[1].get<float>(),
+                    position[2].get<float>()
+                });
+
+                auto rotation = transformJson.at("rotation");
+                object->GetTransform().SetLocalRotation({
+                    rotation[0].get<float>(),
+                    rotation[1].get<float>(),
+                    rotation[2].get<float>()
+                });
+
+                auto scale = transformJson.at("scale");
+                object->GetTransform().SetLocalScale({
+                    scale[0].get<float>(),
+                    scale[1].get<float>(),
+                    scale[2].get<float>()
+                });
+            }
+
+            const ObjectId parentId = objectJson->value("parent", InvalidObjectId);
+
+            if (parentId != InvalidObjectId) {
+                auto parentIt = idMap.find(parentId);
+
+                if (parentIt != idMap.end()) {
+                    object->GetTransform().SetParent(&parentIt->second->GetTransform());
+                } else {
+                    std::cerr << "Parent not found while loading object " << id << '\n';
+                }
+            }
+        }
+
+        // Pass 3:
+        // Create and deserialize components.
+        for (const json* objectJson : objectJsonList) {
+            const auto id = objectJson->at("id").get<ObjectId>();
+            GameObject* object = idMap.at(id);
+
+            if (!objectJson->contains("components")) {
+                continue;
+            }
+
+            for (const auto& componentJson : objectJson->at("components")) {
+                const std::string type = componentJson.at("type").get<std::string>();
+
+                Component* component = ComponentFactory::Create(type, *object);
+
+                if (!component) {
+                    std::cerr << "Unknown component type while loading scene: " << type << '\n';
+                    continue;
+                }
+
+                component->SetEnabled(componentJson.value("enabled", true));
+
+                if (componentJson.contains("data")) {
+                    component->Deserialize(componentJson.at("data"));
+                }
+            }
+        }
+
+        // Pass 4:
+        // Resolve object references now that all objects and components exist.
+        for (const auto& objectPtr : scene.GetObjects()) {
+            if (!objectPtr) {
+                continue;
+            }
+
+            for (const auto& componentPtr : objectPtr->GetComponents()) {
+                if (!componentPtr) {
+                    continue;
+                }
+
+                componentPtr->ResolveReferences(idMap);
+            }
+        }
+
+    } catch (const std::exception& e) {
+        std::cerr << "Failed to load scene: " << e.what() << '\n';
+        scene.RemoveAll();
+        return false;
+    }
+
+    return true;
+}