Prepare script lifecycle and data layer

engine/src/Components/GameObject.cpp

@@ -43,6 +43,41 @@ std::unordered_map<GameObject::ID, GameObject*>& GameObject::GetGlobalRegistry()
     return registry;
 }
 
+void GameObject::NotifyComponentsBecameActive() {
+    for (auto& comp : m_components) {
+        if (comp->IsEnabled()) {
+            comp->OnEnable();
+        }
+    }
+}
+
+void GameObject::NotifyComponentsBecameInactive() {
+    for (auto& comp : m_components) {
+        if (comp->IsEnabled()) {
+            comp->OnDisable();
+        }
+    }
+}
+
+void GameObject::PropagateActiveInHierarchyChange(bool oldParentActiveInHierarchy, bool newParentActiveInHierarchy) {
+    const bool wasActiveInHierarchy = oldParentActiveInHierarchy && m_activeSelf;
+    const bool isActiveInHierarchy = newParentActiveInHierarchy && m_activeSelf;
+
+    if (wasActiveInHierarchy != isActiveInHierarchy) {
+        if (isActiveInHierarchy) {
+            NotifyComponentsBecameActive();
+        } else {
+            NotifyComponentsBecameInactive();
+        }
+    }
+
+    for (auto* child : m_children) {
+        if (child) {
+            child->PropagateActiveInHierarchyChange(wasActiveInHierarchy, isActiveInHierarchy);
+        }
+    }
+}
+
 void GameObject::SetParent(GameObject* parent) {
     SetParent(parent, true);
 }
@@ -52,6 +87,9 @@ void GameObject::SetParent(GameObject* parent, bool worldPositionStays) {
         return;
     }
 
+    const bool oldParentActiveInHierarchy = m_parent ? m_parent->IsActiveInHierarchy() : true;
+    const bool wasActiveInHierarchy = oldParentActiveInHierarchy && m_activeSelf;
+
     if (m_parent) {
         auto& siblings = m_parent->m_children;
         siblings.erase(std::remove(siblings.begin(), siblings.end(), this), siblings.end());
@@ -72,6 +110,21 @@ void GameObject::SetParent(GameObject* parent, bool worldPositionStays) {
     }
 
     GetTransform()->SetParent(parent ? parent->GetTransform() : nullptr, worldPositionStays);
+
+    const bool newParentActiveInHierarchy = m_parent ? m_parent->IsActiveInHierarchy() : true;
+    const bool isActiveInHierarchy = newParentActiveInHierarchy && m_activeSelf;
+    if (wasActiveInHierarchy != isActiveInHierarchy) {
+        if (isActiveInHierarchy) {
+            NotifyComponentsBecameActive();
+        } else {
+            NotifyComponentsBecameInactive();
+        }
+        for (auto* child : m_children) {
+            if (child) {
+                child->PropagateActiveInHierarchyChange(wasActiveInHierarchy, isActiveInHierarchy);
+            }
+        }
+    }
 }
 
 GameObject* GameObject::GetChild(size_t index) const {
@@ -101,9 +154,26 @@ void GameObject::DetachFromParent() {
 }
 
 void GameObject::SetActive(bool active) {
-    if (m_activeSelf != active) {
-        m_activeSelf = active;
-        if (m_parent == nullptr || m_parent->IsActiveInHierarchy()) {
+    if (m_activeSelf == active) {
+        return;
+    }
+
+    const bool parentActiveInHierarchy = m_parent ? m_parent->IsActiveInHierarchy() : true;
+    const bool wasActiveInHierarchy = parentActiveInHierarchy && m_activeSelf;
+
+    m_activeSelf = active;
+
+    const bool isActiveInHierarchy = parentActiveInHierarchy && m_activeSelf;
+    if (wasActiveInHierarchy != isActiveInHierarchy) {
+        if (isActiveInHierarchy) {
+            NotifyComponentsBecameActive();
+        } else {
+            NotifyComponentsBecameInactive();
+        }
+        for (auto* child : m_children) {
+            if (child) {
+                child->PropagateActiveInHierarchyChange(wasActiveInHierarchy, isActiveInHierarchy);
+            }
         }
     }
 }
@@ -155,35 +225,78 @@ void GameObject::Awake() {
 }
 
 void GameObject::Start() {
-    for (auto& comp : m_components) {
-        if (comp->IsEnabled()) {
-            comp->Start();
+    if (!IsActiveInHierarchy()) {
+        return;
+    }
+
+    if (!m_started) {
+        for (auto& comp : m_components) {
+            if (comp->IsEnabled()) {
+                comp->Start();
+            }
+        }
+        m_started = true;
+    }
+
+    for (auto* child : m_children) {
+        if (child) {
+            child->Start();
         }
     }
 }
 
 void GameObject::Update(float deltaTime) {
+    if (!IsActiveInHierarchy()) {
+        return;
+    }
+
     for (auto& comp : m_components) {
         if (comp->IsEnabled()) {
             comp->Update(deltaTime);
         }
     }
+
+    for (auto* child : m_children) {
+        if (child) {
+            child->Update(deltaTime);
+        }
+    }
 }
 
 void GameObject::FixedUpdate() {
+    if (!IsActiveInHierarchy()) {
+        return;
+    }
+
     for (auto& comp : m_components) {
         if (comp->IsEnabled()) {
             comp->FixedUpdate();
         }
     }
+
+    for (auto* child : m_children) {
+        if (child) {
+            child->FixedUpdate();
+        }
+    }
 }
 
 void GameObject::LateUpdate(float deltaTime) {
+    if (!IsActiveInHierarchy()) {
+        return;
+    }
+
     for (auto& comp : m_components) {
         if (comp->IsEnabled()) {
             comp->LateUpdate(deltaTime);
         }
     }
+
+    for (auto* child : m_children) {
+        if (child) {
+            child->LateUpdate(deltaTime);
+        }
+    }
 }
 
 void GameObject::OnDestroy() {
@@ -193,9 +306,10 @@ void GameObject::OnDestroy() {
 }
 
 void GameObject::Destroy() {
-    OnDestroy();
     if (m_scene) {
         m_scene->DestroyGameObject(this);
+    } else {
+        OnDestroy();
     }
 }
 
@@ -203,6 +317,7 @@ void GameObject::Serialize(std::ostream& os) const {
     os << "name=" << m_name << ";";
     os << "active=" << (m_activeSelf ? "1" : "0") << ";";
     os << "id=" << m_id << ";";
+    os << "uuid=" << m_uuid << ";";
     os << "transform=";
     m_transform->Serialize(os);
     os << ";";
@@ -233,6 +348,9 @@ void GameObject::Deserialize(std::istream& is) {
         } else if (strcmp(key, "id") == 0) {
             is >> m_id;
             if (is.peek() == ';') is.get();
+        } else if (strcmp(key, "uuid") == 0) {
+            is >> m_uuid;
+            if (is.peek() == ';') is.get();
         } else if (strcmp(key, "transform") == 0) {
             m_transform->Deserialize(is);
             if (is.peek() == ';') is.get();