Implemented entity cloning

src/Component.h

@@ -7,6 +7,8 @@
 struct Component
 {
 	EntityID Entity;
+
+	virtual Component* Clone() const = 0;
 };
 
 class ComponentFactory : public Factory<Component*> { };

src/Components/Box.h

@@ -14,6 +14,8 @@ struct Box : Component
 	float Width;
 	float Height;
 	float Depth;
+
+	virtual Box* Clone() const override { return new Box(*this); }
 };
 
 }

src/Components/Camera.h

@@ -13,6 +13,8 @@ struct Camera : Component
 	float FOV;
 	float NearClip;
 	float FarClip;
+
+	virtual Camera* Clone() const override { return new Camera(*this); }
 };
 
 }

src/Components/DirectionalLight.h

@@ -13,6 +13,8 @@ struct DirectionalLight : Component
 	float MaxRange;
 	float SpecularIntensity;
 	Color Color;
+
+	virtual DirectionalLight* Clone() const override { return new DirectionalLight(*this); }
 };
 
 }

src/Components/FreeSteering.h

@@ -9,6 +9,8 @@ struct FreeSteering : Component
 {
 	FreeSteering() : Speed(35) { }
 	float Speed;
+
+	virtual FreeSteering* Clone() const override { return new FreeSteering(*this); }
 };
 }
 

src/Components/Input.h

@@ -18,6 +18,8 @@ struct Input : Component
 	std::array<int, GLFW_MOUSE_BUTTON_LAST+1> LastMouseState;
 	float dX, dY;
 	float WheelDelta;
+
+	virtual Input* Clone() const override { return new Input(*this); }
 };
 
 }

src/Components/Model.h

@@ -16,6 +16,8 @@ struct Model : Component
 	Color Color;
 	bool Visible;
 	bool ShadowCaster;
+
+	virtual Model* Clone() const override { return new Model(*this); }
 };
 
 }

src/Components/Particle.h

@@ -16,6 +16,8 @@ namespace Components
 		double LifeTime;
 		std::vector<glm::vec3> VelocitySpectrum;
 		std::vector<glm::vec3> AngularVelocitySpectrum;
+
+		virtual Particle* Clone() const override { return new Particle(*this); }
 	};
 
 }

src/Components/ParticleEmitter.h

@@ -24,6 +24,8 @@ struct ParticleEmitter : Component
 	std::vector<glm::vec3> VelocitySpectrum;
 	std::vector<glm::vec3> AngularVelocitySpectrum;
 
+	virtual ParticleEmitter* Clone() const override { return new ParticleEmitter(*this); }
+
 private:
 	double TimeSinceLastSpawn;
 };

src/Components/Physics.h

@@ -12,6 +12,8 @@ struct Physics : Component
 		: Mass(0.f) { }
 
 	float Mass;
+
+	virtual Physics* Clone() const override { return new Physics(*this); }
 };
 
 }

src/Components/PointLight.h

@@ -16,6 +16,8 @@ struct PointLight : Component
 	float constantAttenuation, linearAttenuation, quadraticAttenuation;
 	float spotExponent;
 	Color color;
+	
+	virtual PointLight* Clone() const override { return new PointLight(*this); }
 };
 
 }

src/Components/SoundEmitter.h

@@ -17,6 +17,8 @@ struct SoundEmitter : Component
 	float Pitch;
 	bool Loop;
 	std::string Path;
+
+	virtual SoundEmitter* Clone() const override { return new SoundEmitter(*this); }
 };
 
 }

src/Components/Sphere.h

@@ -12,6 +12,8 @@ struct Sphere : Component
 		: Radius(1.f){ }
 
 	float Radius;
+
+	virtual Sphere* Clone() const override { return new Sphere(*this); }
 };
 
 }

src/Components/Sprite.h

@@ -13,6 +13,8 @@ struct Sprite : Component
 {
 	std::string SpriteFile;
 	Color Color;
+	
+	virtual Sprite* Clone() const override { return new Sprite(*this); }
 };
 
 }

src/Components/Template.h

@@ -6,7 +6,12 @@
 namespace Components
 {
 
-struct Template : Component { };
+struct Template 
+	: public Component 
+{
+	virtual Template* Clone() const override { return nullptr; }
+};
 
 }
+
 #endif // !Components_Template_h__

src/Components/Transform.h

@@ -6,7 +6,7 @@
 namespace Components
 {
 
-struct Transform : Component
+struct Transform : public Component
 {
 	Transform()
 		: Scale(glm::vec3(1.f)) { }
@@ -15,6 +15,8 @@ struct Transform : Component
 	glm::quat Orientation;
 	glm::vec3 Velocity;
 	glm::vec3 Scale;
+
+	virtual Transform* Clone() const override { return new Transform(*this); }
 };
 
 }

src/World.cpp

@@ -93,6 +93,7 @@ void World::ProcessEntityRemovals()
 	for (auto entity : m_EntitiesToRemove)
 	{
 		m_EntityParents.erase(entity);
+		m_EntityChildren.erase(entity);
 		// Remove components
 		for (auto pair : m_EntityComponents[entity])
 		{
@@ -116,7 +117,8 @@ void World::ProcessEntityRemovals()
 EntityID World::CreateEntity(EntityID parent /*= 0*/)
 {
 	EntityID newEntity = GenerateEntityID();
-	m_EntityParents.insert(std::pair<EntityID, EntityID>(newEntity, parent));
+	m_EntityParents[newEntity] = parent;
+	m_EntityChildren[parent].push_back(newEntity);
 	return newEntity;
 }
 
@@ -148,7 +150,58 @@ std::shared_ptr<Component> World::AddComponent(EntityID entity, std::string comp
 	return AddComponent<Component>(entity, componentType);
 }
 
+void World::AddComponent(EntityID entity, std::string componentType, std::shared_ptr<Component> component)
+{
+	component->Entity = entity;
+	m_ComponentsOfType[componentType].push_back(component);
+	m_EntityComponents[entity][componentType] = component;
+	for (auto pair : m_Systems)
+	{
+		auto system = pair.second;
+		system->OnComponentCreated(componentType, component);
+	}
+}
+
 void World::AddSystem(std::string systemType)
 {
 	m_Systems[systemType] = std::shared_ptr<System>(m_SystemFactory.Create(systemType));
 }
+
+EntityID World::CloneEntity(EntityID entity, EntityID parent /* = 0 */)
+{
+	int clone = CreateEntity(parent);
+
+	for (auto pair : m_EntityComponents[entity])
+	{
+		auto type = pair.first;
+		auto component = std::shared_ptr<Component>(pair.second->Clone());
+		if (component != nullptr)
+		{
+			AddComponent(clone, type, component);
+		}
+	}
+
+	auto itChildren = m_EntityChildren.find(entity);
+	if (itChildren != m_EntityChildren.end())
+	{
+		for (EntityID child : itChildren->second)
+		{
+			CloneEntity(child, clone);
+		}
+	}
+
+	return clone;
+}
+
+std::list<EntityID> World::GetEntityChildren(EntityID entity)
+{
+	auto it = m_EntityChildren.find(entity);
+	if (it == m_EntityChildren.end())
+	{
+		return std::list<EntityID>();
+	}
+	else
+	{
+		return it->second;
+	}
+}

src/World.h

@@ -34,6 +34,7 @@ public:
 	std::shared_ptr<T> GetSystem(std::string systemType);
 
 	EntityID CreateEntity(EntityID parent = 0);
+	EntityID CloneEntity(EntityID entity, EntityID parent = 0);
 
 	void RemoveEntity(EntityID entity);
 
@@ -41,6 +42,7 @@ public:
 
 	EntityID GetEntityParent(EntityID entity);
 	EntityID GetEntityBaseParent(EntityID entity);
+	std::list<EntityID> GetEntityChildren(EntityID entity);
 
 	template <class T>
 	T GetProperty(EntityID entity, std::string property)
@@ -83,13 +85,16 @@ protected:
 
 	EntityID m_LastEntityID;
 	std::stack<EntityID> m_RecycledEntityIDs;
-	// A bottom to top tree. A map of child entities to parent entities.
-	std::unordered_map<EntityID, EntityID> m_EntityParents;
-	std::unordered_map<EntityID, std::unordered_map<std::string, boost::any>> m_EntityProperties;
 
+	std::unordered_map<EntityID, EntityID> m_EntityParents; // child -> parent
+	std::unordered_map<EntityID, std::list<EntityID>> m_EntityChildren; // parent -> child
+	std::unordered_map<EntityID, std::unordered_map<std::string, boost::any>> m_EntityProperties;
 	std::unordered_map<std::string, std::list<std::shared_ptr<Component>>> m_ComponentsOfType;
 	std::unordered_map<EntityID, std::map<std::string, std::shared_ptr<Component>>> m_EntityComponents;
 
+	// Internal: Add a component to an entity
+	void AddComponent(EntityID entity, std::string componentType, std::shared_ptr<Component> component);
+
 	std::list<EntityID> m_EntitiesToRemove;
 	void ProcessEntityRemovals();
 
@@ -121,14 +126,8 @@ std::shared_ptr<T> World::AddComponent(EntityID entity, std::string componentTyp
 		return nullptr;
 	}
 
-	component->Entity = entity;
-	m_ComponentsOfType[componentType].push_back(component);
-	m_EntityComponents[entity][componentType] = component;
-	for (auto pair : m_Systems)
-	{
-		auto system = pair.second;
-		system->OnComponentCreated(componentType, component);
-	}
+	AddComponent(entity, componentType, component);
+	
 	return component;
 }
 

vs11/Returngeance/Returngeance.vcxproj.filters

@@ -215,14 +215,18 @@
     <ClInclude Include="..\..\src\Sound.h">
       <Filter>Audio</Filter>
     </ClInclude>
-    <ClInclude Include="..\..\src\Components\Box.h" />
-    <ClInclude Include="..\..\src\Components\Sphere.h" />
     <ClInclude Include="..\..\src\Systems\ParticleSystem.h">
       <Filter>Particle System\Systems</Filter>
     </ClInclude>
     <ClInclude Include="..\..\src\Components\Particle.h">
       <Filter>Particle System\Components</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\src\Components\Box.h">
+      <Filter>Physics\Components</Filter>
+    </ClInclude>
+    <ClInclude Include="..\..\src\Components\Sphere.h">
+      <Filter>Physics\Components</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <None Include="..\..\src\Shaders\AABB.frag.glsl">