added UUID

open_engine/include/open_engine/core/uuid.hpp

@@ -0,0 +1,36 @@
+#ifndef UUID_HPP
+#define UUID_HPP
+
+#include <cstdint>
+
+namespace OpenEngine {
+
+    class UUID
+    {
+        public:
+            UUID();
+            UUID(uint64_t uuid);
+            UUID(const UUID&) = default;
+
+            operator uint64_t() const { return uuid; };
+
+        private:
+            uint64_t uuid;
+    };
+
+}
+
+namespace std {
+
+    template<>
+        struct hash<OpenEngine::UUID>
+        {
+            std::size_t operator()(const OpenEngine::UUID& uuid) const
+            {
+                return hash<uint64_t>()((uint64_t)uuid);
+            }
+        };
+
+}
+
+#endif // UUID_HPP

open_engine/include/open_engine/scene/components.hpp

@@ -1,12 +1,12 @@
 #ifndef COMPONENTS_HPP
 #define COMPONENTS_HPP
 
-#include "open_engine/scene/native_scriptable_entity.hpp"
 #include "open_engine/renderer/renderer3d.hpp"
 #include "open_engine/scene/scene_camera.hpp"
 #include "open_engine/renderer/texture.hpp"
 #include "open_engine/renderer/renderer3d.hpp"
 #include "open_engine/physics.hpp"
+#include "open_engine/core/uuid.hpp"
 
 #include <Jolt/Physics/Body/BodyCreationSettings.h>
 #include <Jolt/Physics/Body/BodyInterface.h>
@@ -28,6 +28,15 @@
 
 namespace OpenEngine {
 
+    struct IDComponent
+    {
+        UUID id;
+
+        IDComponent() = default;
+        IDComponent(const IDComponent&) = default;
+        IDComponent(const UUID& uuid) : id(uuid) {};
+    };
+
     struct TagComponent
     {
         std::string tag;
@@ -74,6 +83,8 @@ namespace OpenEngine {
         CameraComponent(const CameraComponent&) = default;
     };
 
+    class NativeScriptableEntity;
+
     struct NativeScriptComponent 
     {
         NativeScriptableEntity* instance = nullptr;
@@ -81,9 +92,6 @@ namespace OpenEngine {
         NativeScriptableEntity* (*InstanciateScript)();
         void (*DestroyInstanceScript)(NativeScriptComponent*);
 
-        void OnImGuiRender(Entity& entity) 
-        {};
-
         template <typename T>
             void Bind()
             {

open_engine/include/open_engine/scene/entity.hpp

@@ -3,6 +3,8 @@
 
 #include "open_engine/core.hpp"
 
+#include "open_engine/core/uuid.hpp"
+#include "open_engine/scene/components.hpp"
 #include "open_engine/scene/scene.hpp"
 
 #include <cstdint>
@@ -48,6 +50,8 @@ namespace OpenEngine {
                     return scene->registry.all_of<T>(handle);
                 };
 
+            UUID GetUUID() { return GetComponents<IDComponent>().id; };
+
             operator bool() const { return handle != entt::null; };
             operator entt::entity() const { return handle; };
             operator uint32_t() const { return (uint32_t)handle; };

open_engine/include/open_engine/scene/native_scriptable_entity.hpp

@@ -1,6 +1,7 @@
 #ifndef NATIVE_SCRIPTABLE_ENTITY_HPP
 #define NATIVE_SCRIPTABLE_ENTITY_HPP
 
+#include "open_engine/scene/native_scriptable_entity.hpp"
 #include "open_engine/scene/entity.hpp"
 
 namespace OpenEngine {

open_engine/include/open_engine/scene/scene.hpp

@@ -1,6 +1,7 @@
 #ifndef SCENE_HPP
 #define SCENE_HPP
 
+#include "open_engine/core/uuid.hpp"
 #include "open_engine/renderer/editor_camera.hpp"
 #include "open_engine/physics.hpp"
 
@@ -24,6 +25,7 @@ namespace OpenEngine {
             void OnRuntimeStop();
 
             Entity CreateEntity(const std::string& name = std::string());
+            Entity CreateEntityWithUUID(UUID uuid, const std::string& name = std::string());
             void DeleteEntity(entt::entity entity);
             void MarkEntityForDeletion(Entity entity);
 

open_engine/src/open_engine/core/uuid.cpp

@@ -0,0 +1,24 @@
+#include <cstdint>
+#include <pch.hpp>
+
+#include <core/uuid.hpp>
+
+#include <random>
+
+namespace OpenEngine {
+
+    static std::random_device s_random_device;
+    static std::mt19937_64 s_engine(s_random_device());
+    static std::uniform_int_distribution<uint64_t> s_uniform_distribution;
+
+    UUID::UUID()
+        : uuid(s_uniform_distribution(s_engine))
+    {
+    }
+
+    UUID::UUID(uint64_t uuid)
+        : uuid(uuid)
+    {
+    }
+
+}

open_engine/src/open_engine/scene/scene.cpp

@@ -8,6 +8,7 @@
 
 #include <renderer/renderer3d.hpp>
 #include <scene/components.hpp>
+#include <open_engine/scene/native_scriptable_entity.hpp>
 #include <scene/entity.hpp>
 #include <scene/scene.hpp>
 #include <core/time.hpp>
@@ -98,9 +99,15 @@ namespace OpenEngine {
     }
 
     Entity Scene::CreateEntity(const std::string& name)
+    {
+        return CreateEntityWithUUID(UUID(), name);
+    }
+
+    Entity Scene::CreateEntityWithUUID(UUID uuid, const std::string& name)
     {
         Entity entity = { registry.create(), this };
 
+        entity.AddComponent<IDComponent>(uuid);
         auto& tag = entity.AddComponent<TagComponent>();
         tag.tag = name.empty() ? "Entity" : name;
 
@@ -340,4 +347,9 @@ namespace OpenEngine {
 	void Scene::OnComponentAdded<BoxShapeComponent>(Entity entity, BoxShapeComponent& component)
 	{
 	}
+
+    template<>
+	void Scene::OnComponentAdded<IDComponent>(Entity entity, IDComponent& component)
+	{
+	}
 }

open_engine/src/open_engine/scene/scene_serializer.cpp

@@ -88,8 +88,10 @@ namespace OpenEngine {
 
     static void SerializeEntity(YAML::Emitter& out, Entity entity)
     {
+        OE_CORE_ASSERT(entity.HasComponent<IDComponent>(), "Entity is missing UUID.");
+
         out << YAML::BeginMap;
-        out << YAML::Key << "Entity" << YAML::Value << "412741205"; // Needs random
+        out << YAML::Key << "Entity" << YAML::Value << entity.GetUUID(); // Needs random
 
         if (entity.HasComponent<TagComponent>())
         {
@@ -258,7 +260,7 @@ namespace OpenEngine {
 		{
 			for (auto entity : entities)
 			{
-				uint64_t uuid = entity["Entity"].as<uint64_t>(); // TODO
+				uint64_t uuid = entity["Entity"].as<uint64_t>();
 
 				std::string name;
 				auto tagComponent = entity["TagComponent"];
@@ -267,7 +269,7 @@ namespace OpenEngine {
 
 				OE_CORE_TRACE("Deserialized entity with ID = {0}, name = {1}", uuid, name);
 
-				Entity deserializedEntity = context->CreateEntity(name);
+				Entity deserializedEntity = context->CreateEntityWithUUID(uuid, name);
 
 				auto transformComponent = entity["TransformComponent"];
 				if (transformComponent)