merge `loek/scripts`

77 files changed, 974 insertions, 560 deletions

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index c3f29da..97b21f0 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -40,5 +40,6 @@ install(
 
 target_link_libraries(test_main
 	PRIVATE gtest
+	PRIVATE gmock
 	PUBLIC crepe
 )
diff --git a/src/crepe/CMakeLists.txt b/src/crepe/CMakeLists.txt
index 0313dfa..6cbb9fe 100644
--- a/src/crepe/CMakeLists.txt
+++ b/src/crepe/CMakeLists.txt
@@ -1,25 +1,21 @@
 target_sources(crepe PUBLIC
 	Particle.cpp
-	ComponentManager.cpp
 	Component.cpp
 	Collider.cpp
-	ResourceManager.cpp
 	Resource.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
-	ComponentManager.h
-	ComponentManager.hpp
 	Component.h
 	Collider.h
 	ValueBroker.h
 	ValueBroker.hpp
-	ResourceManager.h
 	Resource.h
 )
 
 add_subdirectory(api)
 add_subdirectory(facade)
+add_subdirectory(manager)
 add_subdirectory(system)
 add_subdirectory(util)
 
diff --git a/src/crepe/ComponentManager.cpp b/src/crepe/ComponentManager.cpp
deleted file mode 100644
index e4de027..0000000
--- a/src/crepe/ComponentManager.cpp
+++ /dev/null
@@ -1,33 +0,0 @@
-#include "api/GameObject.h"
-#include "util/Log.h"
-
-#include "ComponentManager.h"
-
-using namespace crepe;
-using namespace std;
-
-ComponentManager::ComponentManager() { dbg_trace(); }
-ComponentManager::~ComponentManager() { dbg_trace(); }
-
-void ComponentManager::delete_all_components_of_id(game_object_id_t id) {
-	// Loop through all the types (in the unordered_map<>)
-	for (auto & [type, componentArray] : this->components) {
-		// Make sure that the id (that we are looking for) is within the boundaries of the vector<>
-		if (id < componentArray.size()) {
-			// Clear the components at this specific id
-			componentArray[id].clear();
-		}
-	}
-}
-
-void ComponentManager::delete_all_components() {
-	this->components.clear();
-	this->next_id = 0;
-}
-
-GameObject ComponentManager::new_object(const string & name, const string & tag,
-										const vec2 & position, double rotation, double scale) {
-	GameObject object{*this, this->next_id, name, tag, position, rotation, scale};
-	this->next_id++;
-	return object;
-}
diff --git a/src/crepe/api/Animator.cpp b/src/crepe/api/Animator.cpp
index 464b0fd..45f67f6 100644
--- a/src/crepe/api/Animator.cpp
+++ b/src/crepe/api/Animator.cpp
@@ -14,11 +14,14 @@ Animator::Animator(game_object_id_t id, Sprite & ss, int row, int col, int col_a
 	  col(col) {
 	dbg_trace();
 
-	animator_rect = spritesheet.sprite_rect;
-	animator_rect.h /= col;
-	animator_rect.w /= row;
-	animator_rect.x = 0;
-	animator_rect.y = col_animator * animator_rect.h;
+	this->spritesheet.mask.h /= col;
+	this->spritesheet.mask.w /= row;
+	this->spritesheet.mask.x = 0;
+	this->spritesheet.mask.y = col_animator * this->spritesheet.mask.h;
 	this->active = false;
+
+	// need to do this for to get the aspect ratio for a single clipping in the spritesheet
+	this->spritesheet.aspect_ratio
+		= static_cast<double>(this->spritesheet.mask.w) / this->spritesheet.mask.h;
 }
 Animator::~Animator() { dbg_trace(); }
diff --git a/src/crepe/api/Animator.h b/src/crepe/api/Animator.h
index 53f4b91..6c506aa 100644
--- a/src/crepe/api/Animator.h
+++ b/src/crepe/api/Animator.h
@@ -40,10 +40,6 @@ public:
 	Animator(uint32_t id, Sprite & spritesheet, int row, int col, int col_animate);
 
 	~Animator(); // dbg_trace
-	Animator(const Animator &) = delete;
-	Animator(Animator &&) = delete;
-	Animator & operator=(const Animator &) = delete;
-	Animator & operator=(Animator &&) = delete;
 
 private:
 	//! A reference to the Sprite sheet containing the animation frames.
@@ -61,8 +57,6 @@ private:
 	//! The current row being animated.
 	int curr_row = 0;
 
-	Rect animator_rect;
-
 	//TODO: Is this necessary?
 	//int fps;
 
diff --git a/src/crepe/api/AssetManager.h b/src/crepe/api/AssetManager.h
deleted file mode 100644
index fee6780..0000000
--- a/src/crepe/api/AssetManager.h
+++ /dev/null
@@ -1,62 +0,0 @@
-#pragma once
-
-#include <any>
-#include <memory>
-#include <string>
-#include <unordered_map>
-
-namespace crepe {
-
-/**
- * \brief The AssetManager is responsible for storing and managing assets over multiple scenes.
- * 
- * The AssetManager ensures that assets are loaded once and can be accessed across different
- * scenes. It caches assets to avoid reloading them every time a scene is loaded. Assets are
- * retained in memory until the AssetManager is destroyed, at which point the cached assets are
- * cleared.
- */
-class AssetManager {
-
-private:
-	//! A cache that holds all the assets, accessible by their file path, over multiple scenes.
-	std::unordered_map<std::string, std::any> asset_cache;
-
-private:
-	AssetManager();
-	virtual ~AssetManager();
-
-public:
-	AssetManager(const AssetManager &) = delete;
-	AssetManager(AssetManager &&) = delete;
-	AssetManager & operator=(const AssetManager &) = delete;
-	AssetManager & operator=(AssetManager &&) = delete;
-
-	/**
-	 * \brief Retrieves the singleton instance of the AssetManager.
-	 *
-	 * \return A reference to the single instance of the AssetManager.
-	 */
-	static AssetManager & get_instance();
-
-public:
-	/**
-	 * \brief Caches an asset by loading it from the given file path.
-	 *
-	 * \param file_path The path to the asset file to load.
-	 * \param reload If true, the asset will be reloaded from the file, even if it is already
-	 * cached.
-	 * \tparam T The type of asset to cache (e.g., texture, sound, etc.).
-	 * 
-	 * \return A shared pointer to the cached asset.
-	 * 
-	 * This template function caches the asset at the given file path. If the asset is already
-	 * cached and `reload` is false, the existing cached version will be returned. Otherwise, the
-	 * asset will be reloaded and added to the cache.
-	 */
-	template <typename T>
-	std::shared_ptr<T> cache(const std::string & file_path, bool reload = false);
-};
-
-} // namespace crepe
-
-#include "AssetManager.hpp"
diff --git a/src/crepe/api/AssetManager.hpp b/src/crepe/api/AssetManager.hpp
deleted file mode 100644
index 1c0e978..0000000
--- a/src/crepe/api/AssetManager.hpp
+++ /dev/null
@@ -1,22 +0,0 @@
-#pragma once
-
-#include "AssetManager.h"
-
-namespace crepe {
-
-template <typename asset>
-std::shared_ptr<asset> AssetManager::cache(const std::string & file_path, bool reload) {
-	auto it = asset_cache.find(file_path);
-
-	if (!reload && it != asset_cache.end()) {
-		return std::any_cast<std::shared_ptr<asset>>(it->second);
-	}
-
-	std::shared_ptr<asset> new_asset = std::make_shared<asset>(file_path.c_str());
-
-	asset_cache[file_path] = new_asset;
-
-	return new_asset;
-}
-
-} // namespace crepe
diff --git a/src/crepe/api/BehaviorScript.cpp b/src/crepe/api/BehaviorScript.cpp
index 7bbace0..d22afdf 100644
--- a/src/crepe/api/BehaviorScript.cpp
+++ b/src/crepe/api/BehaviorScript.cpp
@@ -4,12 +4,12 @@
 
 using namespace crepe;
 
-BehaviorScript::BehaviorScript(game_object_id_t id, ComponentManager & mgr)
+BehaviorScript::BehaviorScript(game_object_id_t id, Mediator & mediator)
 	: Component(id),
-	  component_manager(mgr) {}
+	  mediator(mediator) {}
 
 template <>
 BehaviorScript & GameObject::add_component<BehaviorScript>() {
 	ComponentManager & mgr = this->component_manager;
-	return mgr.add_component<BehaviorScript>(this->id, mgr);
+	return mgr.add_component<BehaviorScript>(this->id, mgr.mediator);
 }
diff --git a/src/crepe/api/BehaviorScript.h b/src/crepe/api/BehaviorScript.h
index d556fe5..3909b96 100644
--- a/src/crepe/api/BehaviorScript.h
+++ b/src/crepe/api/BehaviorScript.h
@@ -23,14 +23,13 @@ class BehaviorScript : public Component {
 protected:
 	/**
 	 * \param id Parent \c GameObject id
-	 * \param component_manager Reference to component manager (passed through to \c Script
-	 * instance)
+	 * \param mediator Mediator reference
 	 *
 	 * \note Calls to this constructor (should) always pass through \c GameObject::add_component,
 	 * which has an exception for this specific component type. This was done so the user does
 	 * not have to pass references used within \c Script to each \c BehaviorScript instance.
 	 */
-	BehaviorScript(game_object_id_t id, ComponentManager & component_manager);
+	BehaviorScript(game_object_id_t id, Mediator & mediator);
 	//! Only ComponentManager is allowed to instantiate BehaviorScript
 	friend class ComponentManager;
 
@@ -55,8 +54,8 @@ protected:
 	friend class ScriptSystem;
 
 protected:
-	//! Reference to component manager (passed to Script)
-	ComponentManager & component_manager;
+	//! Reference mediator
+	Mediator & mediator;
 };
 
 /**
diff --git a/src/crepe/api/BehaviorScript.hpp b/src/crepe/api/BehaviorScript.hpp
index bd59337..6de0157 100644
--- a/src/crepe/api/BehaviorScript.hpp
+++ b/src/crepe/api/BehaviorScript.hpp
@@ -14,11 +14,11 @@ BehaviorScript & BehaviorScript::set_script(Args &&... args) {
 	dbg_trace();
 	static_assert(std::is_base_of<Script, T>::value);
 	Script * s = new T(std::forward<Args>(args)...);
+	Mediator & mediator = this->mediator;
 
 	s->game_object_id = this->game_object_id;
 	s->active = this->active;
-	s->component_manager = this->component_manager;
-	s->event_manager = EventManager::get_instance();
+	s->mediator = mediator;
 
 	this->script = std::unique_ptr<Script>(s);
 	return *this;
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index ad82924..0808612 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -8,13 +8,10 @@ target_sources(crepe PUBLIC
 	Color.cpp
 	Texture.cpp
 	Sprite.cpp
-	SaveManager.cpp
 	Config.cpp
 	Metadata.cpp
-	SceneManager.cpp
 	Camera.cpp
 	Animator.cpp
-	EventManager.cpp
 	IKeyListener.cpp
 	IMouseListener.cpp
 	LoopManager.cpp
@@ -38,15 +35,10 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Vector2.hpp
 	Color.h
 	Texture.h 
-	SaveManager.h
 	Scene.h
 	Metadata.h
-	SceneManager.h
-	SceneManager.hpp
 	Camera.h
 	Animator.h
-	EventManager.h
-	EventManager.hpp
 	EventHandler.h
 	EventHandler.hpp
 	Event.h
diff --git a/src/crepe/api/Camera.cpp b/src/crepe/api/Camera.cpp
index 5835bdd..39d8ab0 100644
--- a/src/crepe/api/Camera.cpp
+++ b/src/crepe/api/Camera.cpp
@@ -1,3 +1,4 @@
+#include "types.h"
 #include "util/Log.h"
 
 #include "Camera.h"
@@ -6,9 +7,14 @@
 
 using namespace crepe;
 
-Camera::Camera(game_object_id_t id, const Color & bg_color)
+Camera::Camera(game_object_id_t id, const Color & bg_color, const ivec2 & screen,
+			   const vec2 & viewport_size, const double & zoom, const vec2 & offset)
 	: Component(id),
-	  bg_color(bg_color) {
+	  bg_color(bg_color),
+	  offset(offset),
+	  screen(screen),
+	  viewport_size(viewport_size),
+	  zoom(zoom) {
 	dbg_trace();
 }
 
diff --git a/src/crepe/api/Camera.h b/src/crepe/api/Camera.h
index e0cda34..2d8fa48 100644
--- a/src/crepe/api/Camera.h
+++ b/src/crepe/api/Camera.h
@@ -2,6 +2,7 @@
 
 #include "Color.h"
 #include "Component.h"
+#include "types.h"
 
 namespace crepe {
 
@@ -20,33 +21,31 @@ public:
 	 * \param id Unique identifier for the camera component.
 	 * \param bg_color Background color for the camera view.
 	 */
-	Camera(game_object_id_t id, const Color & bg_color);
+	Camera(game_object_id_t id, const Color & bg_color, const ivec2 & screen,
+		   const vec2 & viewport_size, const double & zoom, const vec2 & offset = {0, 0});
 	~Camera(); // dbg_trace only
 
 public:
 	//! Background color of the camera view.
-	Color bg_color;
+	const Color bg_color;
 
-	//! Aspect ratio height for the camera.
-	double aspect_height = 480;
+	//! offset postion from the game object transform component
+	vec2 offset;
 
-	//! Aspect ratio width for the camera.
-	double aspect_width = 640;
+	//! screen the display size in pixels ( output resolution )
+	const ivec2 screen;
 
-	//! X-coordinate of the camera position.
-	double x = 0.0;
-
-	//! Y-coordinate of the camera position.
-	double y = 0.0;
+	//! viewport is the area of the world visible through the camera (in world units)
+	const vec2 viewport_size;
 
 	//! Zoom level of the camera view.
-	double zoom = 1.0;
+	const double zoom;
 
 public:
 	/**
 	 * \brief Gets the maximum number of camera instances allowed.
 	 * \return Maximum instance count as an integer.
 	 */
-	virtual int get_instances_max() const { return 10; }
+	virtual int get_instances_max() const { return 1; }
 };
 } // namespace crepe
diff --git a/src/crepe/api/Config.h b/src/crepe/api/Config.h
index 5bd6913..693400a 100644
--- a/src/crepe/api/Config.h
+++ b/src/crepe/api/Config.h
@@ -1,6 +1,8 @@
 #pragma once
 
 #include "../util/Log.h"
+#include "types.h"
+#include <string>
 
 namespace crepe {
 
@@ -39,6 +41,14 @@ struct Config final {
 		double gravity = 1;
 	} physics;
 
+	//! default window settings
+	struct {
+		//TODO make this constexpr because this will never change
+		ivec2 default_size = {1080, 720};
+		std::string window_title = "Jetpack joyride clone";
+
+	} window_settings;
+
 	//! Asset loading options
 	struct {
 		/**
diff --git a/src/crepe/api/GameObject.cpp b/src/crepe/api/GameObject.cpp
index 3c36a21..9ef4682 100644
--- a/src/crepe/api/GameObject.cpp
+++ b/src/crepe/api/GameObject.cpp
@@ -30,3 +30,9 @@ void GameObject::set_parent(const GameObject & parent) {
 	RefVector<Metadata> parent_metadata = mgr.get_components_by_id<Metadata>(parent.id);
 	parent_metadata.at(0).get().children.push_back(this->id);
 }
+
+void GameObject::set_persistent(bool persistent) {
+	ComponentManager & mgr = this->component_manager;
+
+	mgr.set_persistent(this->id, persistent);
+}
diff --git a/src/crepe/api/GameObject.h b/src/crepe/api/GameObject.h
index fcb8d9a..4cd2bc0 100644
--- a/src/crepe/api/GameObject.h
+++ b/src/crepe/api/GameObject.h
@@ -58,6 +58,15 @@ public:
 	 */
 	template <typename T, typename... Args>
 	T & add_component(Args &&... args);
+	/**
+	 * \brief Components will not be deleted if this method is called
+	 *
+	 * This method sets the persistent flag of the GameObject to true. If the persistent
+	 * flag is set to true, the GameObject will not be deleted when the scene is changed.
+	 *
+	 * \param persistent The persistent flag
+	 */
+	void set_persistent(bool persistent = true);
 
 public:
 	//! The id of the GameObject
diff --git a/src/crepe/api/GameObject.hpp b/src/crepe/api/GameObject.hpp
index 17b17d7..a6b45b0 100644
--- a/src/crepe/api/GameObject.hpp
+++ b/src/crepe/api/GameObject.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "../ComponentManager.h"
+#include "../manager/ComponentManager.h"
 
 #include "GameObject.h"
 
diff --git a/src/crepe/api/IKeyListener.h b/src/crepe/api/IKeyListener.h
index 328a4c2..6ded107 100644
--- a/src/crepe/api/IKeyListener.h
+++ b/src/crepe/api/IKeyListener.h
@@ -1,8 +1,9 @@
 #pragma once
 
+#include "../manager/EventManager.h"
+
 #include "Event.h"
 #include "EventHandler.h"
-#include "EventManager.h"
 
 namespace crepe {
 
diff --git a/src/crepe/api/IMouseListener.h b/src/crepe/api/IMouseListener.h
index 15e1619..9e4fdf7 100644
--- a/src/crepe/api/IMouseListener.h
+++ b/src/crepe/api/IMouseListener.h
@@ -1,8 +1,9 @@
 #pragma once
 
+#include "../manager/EventManager.h"
+
 #include "Event.h"
 #include "EventHandler.h"
-#include "EventManager.h"
 
 namespace crepe {
 
diff --git a/src/crepe/api/LoopManager.cpp b/src/crepe/api/LoopManager.cpp
index 7edf4d1..b277185 100644
--- a/src/crepe/api/LoopManager.cpp
+++ b/src/crepe/api/LoopManager.cpp
@@ -1,5 +1,3 @@
-#include "../facade/SDLContext.h"
-
 #include "../system/AnimatorSystem.h"
 #include "../system/CollisionSystem.h"
 #include "../system/ParticleSystem.h"
@@ -8,12 +6,14 @@
 #include "../system/ScriptSystem.h"
 
 #include "LoopManager.h"
-#include "LoopTimer.h"
 
 using namespace crepe;
 using namespace std;
 
 LoopManager::LoopManager() {
+	this->mediator.component_manager = this->component_manager;
+	this->mediator.scene_manager = this->scene_manager;
+
 	this->load_system<AnimatorSystem>();
 	this->load_system<CollisionSystem>();
 	this->load_system<ParticleSystem>();
@@ -23,7 +23,7 @@ LoopManager::LoopManager() {
 }
 
 void LoopManager::process_input() {
-	SDLContext::get_instance().handle_events(this->game_running);
+	this->sdl_context.handle_events(this->game_running);
 }
 
 void LoopManager::start() {
@@ -35,7 +35,7 @@ void LoopManager::set_running(bool running) { this->game_running = running; }
 void LoopManager::fixed_update() {}
 
 void LoopManager::loop() {
-	LoopTimer & timer = LoopTimer::get_instance();
+	LoopTimer & timer = this->loop_timer;
 	timer.start();
 
 	while (game_running) {
@@ -55,15 +55,18 @@ void LoopManager::loop() {
 }
 
 void LoopManager::setup() {
+	LoopTimer & timer = this->loop_timer;
+
 	this->game_running = true;
-	LoopTimer::get_instance().start();
-	LoopTimer::get_instance().set_fps(200);
+	timer.start();
+	timer.set_fps(200);
 }
 
 void LoopManager::render() {
-	if (this->game_running) {
-		this->get_system<RenderSystem>().update();
-	}
+	if (!this->game_running) return;
+
+	this->get_system<RenderSystem>().update();
 }
 
-void LoopManager::update() { LoopTimer & timer = LoopTimer::get_instance(); }
+void LoopManager::update() {}
+
diff --git a/src/crepe/api/LoopManager.h b/src/crepe/api/LoopManager.h
index 13e6dac..6ea5ccc 100644
--- a/src/crepe/api/LoopManager.h
+++ b/src/crepe/api/LoopManager.h
@@ -2,9 +2,12 @@
 
 #include <memory>
 
-#include "../ComponentManager.h"
+#include "../manager/ComponentManager.h"
+#include "../manager/SceneManager.h"
 #include "../system/System.h"
-#include "api/SceneManager.h"
+#include "../facade/SDLContext.h"
+
+#include "LoopTimer.h"
 
 namespace crepe {
 
@@ -85,10 +88,18 @@ private:
 	bool game_running = false;
 
 private:
+	//! Global context
+	Mediator mediator;
+
 	//! Component manager instance
-	ComponentManager component_manager{};
+	ComponentManager component_manager{mediator};
 	//! Scene manager instance
-	SceneManager scene_manager{component_manager};
+	SceneManager scene_manager{mediator};
+
+	//! SDL context \todo no more singletons!
+	SDLContext & sdl_context = SDLContext::get_instance();
+	//! Loop timer \todo no more singletons!
+	LoopTimer & loop_timer = LoopTimer::get_instance();
 
 private:
 	/**
diff --git a/src/crepe/api/LoopManager.hpp b/src/crepe/api/LoopManager.hpp
index 9cf470b..cd6bd02 100644
--- a/src/crepe/api/LoopManager.hpp
+++ b/src/crepe/api/LoopManager.hpp
@@ -38,8 +38,11 @@ void LoopManager::load_system() {
 	static_assert(is_base_of<System, T>::value,
 				  "load_system must recieve a derivative class of System");
 
-	System * system = new T(this->component_manager);
-	this->systems[typeid(T)] = unique_ptr<System>(system);
+	System * system = new T(this->mediator);
+	const type_info & type = typeid(T);
+	if (this->systems.contains(type))
+		throw runtime_error(format("LoopManager: {} is already initialized", type.name()));
+	this->systems[type] = unique_ptr<System>(system);
 }
 
 } // namespace crepe
diff --git a/src/crepe/api/Scene.h b/src/crepe/api/Scene.h
index f6fdb2a..66dad17 100644
--- a/src/crepe/api/Scene.h
+++ b/src/crepe/api/Scene.h
@@ -3,6 +3,7 @@
 #include <string>
 
 #include "../util/OptionalRef.h"
+#include "../manager/Mediator.h"
 
 namespace crepe {
 
@@ -34,6 +35,8 @@ public:
 	 */
 	virtual std::string get_name() const = 0;
 
+	// TODO: Late references should ALWAYS be private! This is currently kept as-is so unit tests
+	// keep passing, but this reference should not be directly accessible by the user!!!
 protected:
 	/**
 	 * \name Late references
@@ -46,8 +49,8 @@ protected:
 	 *
 	 * \{
 	 */
-	//! Reference to the ComponentManager
-	OptionalRef<ComponentManager> component_manager;
+	//! Mediator reference
+	OptionalRef<Mediator> mediator;
 	//! \}
 };
 
diff --git a/src/crepe/api/Script.cpp b/src/crepe/api/Script.cpp
index fcbe4c7..a27838e 100644
--- a/src/crepe/api/Script.cpp
+++ b/src/crepe/api/Script.cpp
@@ -1,11 +1,17 @@
+#include <string>
+
+#include "../manager/SceneManager.h"
+
 #include "Script.h"
 
 using namespace crepe;
+using namespace std;
 
 Script::~Script() {
-	EventManager & evmgr = this->event_manager;
+	Mediator & mediator = this->mediator;
+	EventManager & mgr = mediator.event_manager;
 	for (auto id : this->listeners) {
-		evmgr.unsubscribe(id);
+		mgr.unsubscribe(id);
 	}
 }
 
@@ -13,3 +19,10 @@ template <>
 void Script::subscribe(const EventHandler<CollisionEvent> & callback) {
 	this->subscribe_internal(callback, this->game_object_id);
 }
+
+void Script::set_next_scene(const string & name) {
+	Mediator & mediator = this->mediator;
+	SceneManager & mgr = mediator.scene_manager;
+	mgr.set_next_scene(name);
+}
+
diff --git a/src/crepe/api/Script.h b/src/crepe/api/Script.h
index a0870cb..e1f86b2 100644
--- a/src/crepe/api/Script.h
+++ b/src/crepe/api/Script.h
@@ -4,8 +4,8 @@
 
 #include "../types.h"
 #include "../util/OptionalRef.h"
-
-#include "EventManager.h"
+#include "../manager/Mediator.h"
+#include "../manager/EventManager.h"
 
 namespace crepe {
 
@@ -106,6 +106,12 @@ protected:
 	template <typename EventType>
 	void subscribe(const EventHandler<EventType> & callback);
 
+	/**
+	 * \brief Set the next scene using SceneManager
+	 * \see SceneManager::set_next_scene
+	 */
+	void set_next_scene(const std::string & name);
+
 	//! \}
 
 private:
@@ -160,10 +166,8 @@ private:
 	game_object_id_t game_object_id;
 	//! Reference to parent component
 	OptionalRef<bool> active;
-	//! Reference to component manager instance
-	OptionalRef<ComponentManager> component_manager;
-	//! Reference to event manager instance
-	OptionalRef<EventManager> event_manager;
+	//! Mediator reference
+	OptionalRef<Mediator> mediator;
 	//! \}
 
 private:
diff --git a/src/crepe/api/Script.hpp b/src/crepe/api/Script.hpp
index a2463bf..45f1ff1 100644
--- a/src/crepe/api/Script.hpp
+++ b/src/crepe/api/Script.hpp
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "../ComponentManager.h"
+#include "../manager/ComponentManager.h"
 
 #include "BehaviorScript.h"
 #include "Script.h"
@@ -20,7 +20,8 @@ T & Script::get_component() const {
 
 template <typename T>
 RefVector<T> Script::get_components() const {
-	ComponentManager & mgr = this->component_manager;
+	Mediator & mediator = this->mediator;
+	ComponentManager & mgr = mediator.component_manager;
 
 	return mgr.get_components_by_id<T>(this->game_object_id);
 }
@@ -33,7 +34,8 @@ void Script::logf(Args &&... args) {
 template <typename EventType>
 void Script::subscribe_internal(const EventHandler<EventType> & callback,
 								event_channel_t channel) {
-	EventManager & mgr = this->event_manager;
+	Mediator & mediator = this->mediator;
+	EventManager & mgr = mediator.event_manager;
 	subscription_t listener = mgr.subscribe<EventType>(
 		[this, callback](const EventType & data) -> bool {
 			bool & active = this->active;
diff --git a/src/crepe/api/Sprite.cpp b/src/crepe/api/Sprite.cpp
index bd2d5cf..8647794 100644
--- a/src/crepe/api/Sprite.cpp
+++ b/src/crepe/api/Sprite.cpp
@@ -1,7 +1,7 @@
-#include <memory>
+#include <cmath>
+#include <utility>
 
 #include "../util/Log.h"
-#include "facade/SDLContext.h"
 
 #include "Component.h"
 #include "Sprite.h"
@@ -10,16 +10,21 @@
 using namespace std;
 using namespace crepe;
 
-Sprite::Sprite(game_object_id_t id, const shared_ptr<Texture> image, const Color & color,
-			   const FlipSettings & flip)
+Sprite::Sprite(game_object_id_t id, Texture & image, const Color & color,
+			   const FlipSettings & flip, int sort_layer, int order_layer, int height)
 	: Component(id),
 	  color(color),
 	  flip(flip),
-	  sprite_image(image) {
+	  sprite_image(std::move(image)),
+	  sorting_in_layer(sort_layer),
+	  order_in_layer(order_layer),
+	  height(height) {
+
 	dbg_trace();
 
-	this->sprite_rect.w = sprite_image->get_width();
-	this->sprite_rect.h = sprite_image->get_height();
+	this->mask.w = sprite_image.get_width();
+	this->mask.h = sprite_image.get_height();
+	this->aspect_ratio = static_cast<double>(this->mask.w) / this->mask.h;
 }
 
 Sprite::~Sprite() { dbg_trace(); }
diff --git a/src/crepe/api/Sprite.h b/src/crepe/api/Sprite.h
index 74a55d4..a0e90a0 100644
--- a/src/crepe/api/Sprite.h
+++ b/src/crepe/api/Sprite.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include <memory>
+#include <cstdint>
 
 #include "../Component.h"
 
@@ -9,18 +9,6 @@
 
 namespace crepe {
 
-struct Rect {
-	int w = 0;
-	int h = 0;
-	int x = 0;
-	int y = 0;
-};
-
-struct FlipSettings {
-	bool flip_x = false;
-	bool flip_y = false;
-};
-
 class SDLContext;
 class Animator;
 class AnimatorSystem;
@@ -34,6 +22,12 @@ class AnimatorSystem;
 class Sprite : public Component {
 
 public:
+	struct FlipSettings {
+		bool flip_x = false;
+		bool flip_y = false;
+	};
+
+public:
 	// TODO: Loek comment in github #27 will be looked another time
 	// about shared_ptr Texture
 	/**
@@ -42,9 +36,12 @@ public:
 	 * \param image Shared pointer to the texture for this sprite.
 	 * \param color Color tint applied to the sprite.
 	 * \param flip Flip settings for horizontal and vertical orientation.
+	 * \param order_layer decides the sorting in layer of the sprite.
+	 * \param sort_layer decides the order in layer of the sprite.
+	 * \param height the height of the image in game units
 	 */
-	Sprite(game_object_id_t id, const std::shared_ptr<Texture> image, const Color & color,
-		   const FlipSettings & flip);
+	Sprite(game_object_id_t id, Texture & image, const Color & color,
+		   const FlipSettings & flip, int sort_layer, int order_layer, int height);
 
 	/**
 	 * \brief Destroys the Sprite instance.
@@ -52,38 +49,49 @@ public:
 	~Sprite();
 
 	//! Texture used for the sprite
-	const std::shared_ptr<Texture> sprite_image;
+	const Texture sprite_image;
+
 	//! Color tint of the sprite
 	Color color;
+
 	//! Flip settings for the sprite
 	FlipSettings flip;
+
 	//! Layer sorting level of the sprite
-	uint8_t sorting_in_layer = 0;
+	const int sorting_in_layer;
 	//! Order within the sorting layer
-	uint8_t order_in_layer = 0;
+	const int order_in_layer;
+
+	//! height in world units
+	const int height;
 
-public:
 	/**
-	 * \brief Gets the maximum number of instances allowed for this sprite.
-	 * \return Maximum instance count as an integer.
+	 * \aspect_ratio ratio of the img so that scaling will not become weird
 	 *
-	 * For now is this number randomly picked. I think it will eventually be 1. 
+	 * cannot be const because if Animator component is addded then ratio becomes scuffed and
+	 * does it need to be calculated again in the Animator
 	 */
-	virtual int get_instances_max() const { return 10; }
+	double aspect_ratio;
 
 private:
-	//! Reads the sprite_rect of sprite
+	//! Reads the mask of sprite
 	friend class SDLContext;
 
-	//! Reads the all the variables plus the  sprite_rect
+	//! Reads the all the variables plus the  mask
 	friend class Animator;
 
-	//! Reads the all the variables plus the  sprite_rect
+	//! Reads the all the variables plus the  mask
 	friend class AnimatorSystem;
 
+	struct Rect {
+		int w = 0;
+		int h = 0;
+		int x = 0;
+		int y = 0;
+	};
 	//! Render area of the sprite this will also be adjusted by the AnimatorSystem if an Animator
-	// object is present in GameObject
-	Rect sprite_rect;
+	// object is present in GameObject. this is in sprite pixels
+	Rect mask;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/Texture.cpp b/src/crepe/api/Texture.cpp
index 264d7b1..e43bdaa 100644
--- a/src/crepe/api/Texture.cpp
+++ b/src/crepe/api/Texture.cpp
@@ -1,5 +1,3 @@
-#include <SDL2/SDL_render.h>
-
 #include "../facade/SDLContext.h"
 #include "../util/Log.h"
 
@@ -19,6 +17,15 @@ Texture::~Texture() {
 	this->texture.reset();
 }
 
+Texture::Texture(Texture && other) noexcept : texture(std::move(other.texture)) {}
+
+Texture & Texture::operator=(Texture && other) noexcept {
+	if (this != &other) {
+		texture = std::move(other.texture);
+	}
+	return *this;
+}
+
 void Texture::load(const Asset & res) {
 	SDLContext & ctx = SDLContext::get_instance();
 	this->texture = ctx.texture_from_path(res.get_path());
diff --git a/src/crepe/api/Texture.h b/src/crepe/api/Texture.h
index b4f7d07..7206a66 100644
--- a/src/crepe/api/Texture.h
+++ b/src/crepe/api/Texture.h
@@ -36,6 +36,11 @@ public:
 	~Texture();
 	// FIXME: this constructor shouldn't be necessary because this class doesn't manage memory
 
+	Texture(Texture && other) noexcept;
+	Texture & operator=(Texture && other) noexcept;
+	Texture(const Texture &) = delete;
+	Texture & operator=(const Texture &) = delete;
+
 	/**
 	 * \brief Gets the width of the texture.
 	 * \return Width of the texture in pixels.
diff --git a/src/crepe/facade/SDLContext.cpp b/src/crepe/facade/SDLContext.cpp
index b3298a7..9f60285 100644
--- a/src/crepe/facade/SDLContext.cpp
+++ b/src/crepe/facade/SDLContext.cpp
@@ -10,16 +10,15 @@
 #include <functional>
 #include <memory>
 #include <stdexcept>
-#include <string>
 
 #include "../api/Camera.h"
+#include "../api/Config.h"
 #include "../api/Sprite.h"
 #include "../api/Texture.h"
-#include "../api/Transform.h"
-#include "../api/Vector2.h"
 #include "../util/Log.h"
 
 #include "SDLContext.h"
+#include "types.h"
 
 using namespace crepe;
 using namespace std;
@@ -31,14 +30,15 @@ SDLContext & SDLContext::get_instance() {
 
 SDLContext::SDLContext() {
 	dbg_trace();
-	// FIXME: read window defaults from config manager
 
 	if (SDL_Init(SDL_INIT_VIDEO) != 0) {
 		throw runtime_error(format("SDLContext: SDL_Init error: {}", SDL_GetError()));
 	}
+
+	auto & cfg = Config::get_instance().window_settings;
 	SDL_Window * tmp_window
-		= SDL_CreateWindow("Crepe Game Engine", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
-						   this->viewport.w, this->viewport.h, 0);
+		= SDL_CreateWindow(cfg.window_title.c_str(), SDL_WINDOWPOS_CENTERED,
+						   SDL_WINDOWPOS_CENTERED, cfg.default_size.x, cfg.default_size.y, 0);
 	if (!tmp_window) {
 		throw runtime_error(format("SDLContext: SDL_Window error: {}", SDL_GetError()));
 	}
@@ -93,68 +93,96 @@ void SDLContext::handle_events(bool & running) {
 	*/
 }
 
-void SDLContext::clear_screen() { SDL_RenderClear(this->game_renderer.get()); }
+void SDLContext::clear_screen() {
+	SDL_SetRenderDrawColor(this->game_renderer.get(), 0, 0, 0, 255);
+	SDL_RenderClear(this->game_renderer.get());
+}
 void SDLContext::present_screen() { SDL_RenderPresent(this->game_renderer.get()); }
 
 SDL_Rect SDLContext::get_src_rect(const Sprite & sprite) const {
 	return SDL_Rect{
-		.x = sprite.sprite_rect.x,
-		.y = sprite.sprite_rect.y,
-		.w = sprite.sprite_rect.w,
-		.h = sprite.sprite_rect.h,
+		.x = sprite.mask.x,
+		.y = sprite.mask.y,
+		.w = sprite.mask.w,
+		.h = sprite.mask.h,
 	};
 }
-SDL_Rect SDLContext::get_dst_rect(const Sprite & sprite, const vec2 & pos,
-								  const double & scale, const Camera & cam) const {
+SDL_Rect SDLContext::get_dst_rect(const Sprite & sprite, const vec2 & pos, const Camera & cam,
+								  const vec2 & cam_pos, const double & img_scale) const {
+
+	int width = sprite.height * sprite.aspect_ratio;
+	int height = sprite.height;
 
-	double adjusted_w = sprite.sprite_rect.w * scale * cam.zoom;
-	double adjusted_h = sprite.sprite_rect.h * scale * cam.zoom;
-	double adjusted_x = (pos.x - cam.x) * cam.zoom - adjusted_w / 2;
-	double adjusted_y = (pos.y - cam.y) * cam.zoom - adjusted_h / 2;
+	width *= img_scale * cam.zoom;
+	height *= img_scale * cam.zoom;
 
 	return SDL_Rect{
-		.x = static_cast<int>(adjusted_x),
-		.y = static_cast<int>(adjusted_y),
-		.w = static_cast<int>(adjusted_w),
-		.h = static_cast<int>(adjusted_h),
+		.x = static_cast<int>((pos.x - cam_pos.x + (cam.viewport_size.x / 2) - width / 2)),
+		.y = static_cast<int>((pos.y - cam_pos.y + (cam.viewport_size.y / 2) - height / 2)),
+		.w = width,
+		.h = height,
 	};
 }
 
-void SDLContext::draw_particle(const Sprite & sprite, const vec2 & pos, const double & angle,
-							   const double & scale, const Camera & camera) {
+void SDLContext::draw(const RenderContext & ctx) {
 
 	SDL_RendererFlip render_flip
-		= (SDL_RendererFlip) ((SDL_FLIP_HORIZONTAL * sprite.flip.flip_x)
-							  | (SDL_FLIP_VERTICAL * sprite.flip.flip_y));
+		= (SDL_RendererFlip) ((SDL_FLIP_HORIZONTAL * ctx.sprite.flip.flip_x)
+							  | (SDL_FLIP_VERTICAL * ctx.sprite.flip.flip_y));
 
-	SDL_Rect srcrect = this->get_src_rect(sprite);
-	SDL_Rect dstrect = this->get_dst_rect(sprite, pos, scale, camera);
+	SDL_Rect srcrect = this->get_src_rect(ctx.sprite);
+	SDL_Rect dstrect
+		= this->get_dst_rect(ctx.sprite, ctx.pos, ctx.cam, ctx.cam_pos, ctx.scale);
 
-	SDL_RenderCopyEx(this->game_renderer.get(), sprite.sprite_image->texture.get(), &srcrect,
-					 &dstrect, angle, NULL, render_flip);
+	SDL_RenderCopyEx(this->game_renderer.get(), ctx.sprite.sprite_image.texture.get(),
+					 &srcrect, &dstrect, ctx.angle, NULL, render_flip);
 }
 
-void SDLContext::draw(const Sprite & sprite, const Transform & transform, const Camera & cam) {
-
-	SDL_RendererFlip render_flip
-		= (SDL_RendererFlip) ((SDL_FLIP_HORIZONTAL * sprite.flip.flip_x)
-							  | (SDL_FLIP_VERTICAL * sprite.flip.flip_y));
+void SDLContext::set_camera(const Camera & cam) {
 
-	SDL_Rect srcrect = this->get_src_rect(sprite);
-	SDL_Rect dstrect = this->get_dst_rect(sprite, transform.position, transform.scale, cam);
+	// resize window
+	int w, h;
+	SDL_GetWindowSize(this->game_window.get(), &w, &h);
+	if (w != cam.screen.x || h != cam.screen.y) {
+		SDL_SetWindowSize(this->game_window.get(), cam.screen.x, cam.screen.y);
+	}
 
-	SDL_RenderCopyEx(this->game_renderer.get(), sprite.sprite_image->texture.get(), &srcrect,
-					 &dstrect, transform.rotation, NULL, render_flip);
-}
+	double screen_aspect = cam.screen.x / cam.screen.y;
+	double viewport_aspect = cam.viewport_size.x / cam.viewport_size.y;
+
+	SDL_Rect view;
+	// calculate black bars
+	if (screen_aspect > viewport_aspect) {
+		// letterboxing
+		view.h = cam.screen.y / cam.zoom;
+		view.w = cam.screen.y * viewport_aspect;
+		view.x = (cam.screen.x - view.w) / 2;
+		view.y = 0;
+	} else {
+		// pillarboxing
+		view.h = cam.screen.x / viewport_aspect;
+		view.w = cam.screen.x / cam.zoom;
+		view.x = 0;
+		view.y = (cam.screen.y - view.h) / 2;
+	}
+	// set drawing area
+	SDL_RenderSetViewport(this->game_renderer.get(), &view);
 
-void SDLContext::set_camera(const Camera & cam) {
-	this->viewport.w = static_cast<int>(cam.aspect_width);
-	this->viewport.h = static_cast<int>(cam.aspect_height);
-	this->viewport.x = static_cast<int>(cam.x) - (this->viewport.w / 2);
-	this->viewport.y = static_cast<int>(cam.y) - (this->viewport.h / 2);
+	SDL_RenderSetLogicalSize(this->game_renderer.get(), static_cast<int>(cam.viewport_size.x),
+							 static_cast<int>(cam.viewport_size.y));
 
+	// set bg color
 	SDL_SetRenderDrawColor(this->game_renderer.get(), cam.bg_color.r, cam.bg_color.g,
 						   cam.bg_color.b, cam.bg_color.a);
+
+	SDL_Rect bg = {
+		.x = 0,
+		.y = 0,
+		.w = static_cast<int>(cam.viewport_size.x),
+		.h = static_cast<int>(cam.viewport_size.y),
+	};
+	// fill bg color
+	SDL_RenderFillRect(this->game_renderer.get(), &bg);
 }
 
 uint64_t SDLContext::get_ticks() const { return SDL_GetTicks64(); }
diff --git a/src/crepe/facade/SDLContext.h b/src/crepe/facade/SDLContext.h
index 20e30b3..6030a6e 100644
--- a/src/crepe/facade/SDLContext.h
+++ b/src/crepe/facade/SDLContext.h
@@ -9,9 +9,8 @@
 #include <memory>
 #include <string>
 
+#include "../api/Camera.h"
 #include "../api/Sprite.h"
-#include "../api/Transform.h"
-#include "api/Camera.h"
 
 #include "types.h"
 
@@ -29,6 +28,15 @@ typedef SDL_Keycode CREPE_KEYCODES;
  * event handling, and rendering to the screen. It is never used directly by the user
  */
 class SDLContext {
+public:
+	struct RenderContext {
+		const Sprite & sprite;
+		const Camera & cam;
+		const vec2 & cam_pos;
+		const vec2 & pos;
+		const double & angle;
+		const double & scale;
+	};
 
 public:
 	/**
@@ -100,14 +108,14 @@ private:
 	 * \param texture Reference to the Texture object.
 	 * \return Width of the texture as an integer.
 	 */
-	int get_width(const Texture &) const;
+	int get_width(const Texture & texture) const;
 
 	/**
 	 * \brief Gets the height of a texture.
 	 * \param texture Reference to the Texture object.
 	 * \return Height of the texture as an integer.
 	 */
-	int get_height(const Texture &) const;
+	int get_height(const Texture & texture) const;
 
 private:
 	//! Will use draw,clear_screen, present_screen, camera.
@@ -115,14 +123,9 @@ private:
 
 	/**
 	 * \brief Draws a sprite to the screen using the specified transform and camera.
-	 * \param sprite Reference to the Sprite to draw.
-	 * \param transform Reference to the Transform for positioning.
-	 * \param camera Reference to the Camera for view adjustments.
+	 * \param RenderCtx Reference to rendering data to draw
 	 */
-	void draw(const Sprite & sprite, const Transform & transform, const Camera & camera);
-
-	void draw_particle(const Sprite & sprite, const vec2 & pos, const double & angle,
-					   const double & scale, const Camera & camera);
+	void draw(const RenderContext & ctx);
 
 	//! Clears the screen, preparing for a new frame.
 	void clear_screen();
@@ -144,18 +147,19 @@ private:
 	 * \return sdl rectangle to draw a src image
 	 */
 	SDL_Rect get_src_rect(const Sprite & sprite) const;
+
 	/**
-	 * \brief calculates the sqaure size of the image for an destination
+	 * \brief calculates the sqaure size of the image for destination
 	 *
-	 * \param sprite Reference to the sprite to calculate the rectangle
-	 * \param pos the pos in pixel positions
-	 * \param scale the multiplier to increase of decrease for the specified sprite 
-	 * \param cam Reference to the current camera in the scene to calculate the position based
-	 * on the camera 
+	 * \param sprite Reference to the sprite to calculate rectangle
+	 * \param pos the pos in world units
+	 * \param cam the camera of the current scene
+	 * \param cam_pos the current postion of the camera
+	 * \param img_scale the image multiplier for increasing img size 
 	 * \return sdl rectangle to draw a dst image to draw on the screen
 	 */
-	SDL_Rect get_dst_rect(const Sprite & sprite, const vec2 & pos, const double & scale,
-						  const Camera & cam) const;
+	SDL_Rect get_dst_rect(const Sprite & sprite, const vec2 & pos, const Camera & cam,
+						  const vec2 & cam_pos, const double & img_scale) const;
 
 private:
 	//! sdl Window
@@ -163,9 +167,6 @@ private:
 
 	//! renderer for the crepe engine
 	std::unique_ptr<SDL_Renderer, std::function<void(SDL_Renderer *)>> game_renderer;
-
-	//! viewport for the camera window
-	SDL_Rect viewport = {0, 0, 640, 480};
 };
 
 } // namespace crepe
diff --git a/src/crepe/manager/CMakeLists.txt b/src/crepe/manager/CMakeLists.txt
new file mode 100644
index 0000000..480c8ee
--- /dev/null
+++ b/src/crepe/manager/CMakeLists.txt
@@ -0,0 +1,23 @@
+target_sources(crepe PUBLIC
+	ComponentManager.cpp
+	EventManager.cpp
+	Manager.cpp
+	SaveManager.cpp
+	SceneManager.cpp
+	ResourceManager.cpp
+)
+
+target_sources(crepe PUBLIC FILE_SET HEADERS FILES
+	ComponentManager.h
+	ComponentManager.hpp
+	EventManager.h
+	EventManager.hpp
+	Manager.h
+	Mediator.h
+	SaveManager.h
+	SceneManager.h
+	SceneManager.hpp
+	ResourceManager.h
+	ResourceManager.hpp
+)
+
diff --git a/src/crepe/manager/ComponentManager.cpp b/src/crepe/manager/ComponentManager.cpp
new file mode 100644
index 0000000..5a96158
--- /dev/null
+++ b/src/crepe/manager/ComponentManager.cpp
@@ -0,0 +1,63 @@
+#include "../api/GameObject.h"
+#include "../util/Log.h"
+#include "../types.h"
+
+#include "ComponentManager.h"
+
+using namespace crepe;
+using namespace std;
+
+ComponentManager::ComponentManager(Mediator & mediator) : Manager(mediator) {
+	mediator.component_manager = *this;
+	dbg_trace();
+}
+ComponentManager::~ComponentManager() { dbg_trace(); }
+
+void ComponentManager::delete_all_components_of_id(game_object_id_t id) {
+	// Do not delete persistent objects
+	if (this->persistent[id]) {
+		return;
+	}
+
+	// Loop through all the types (in the unordered_map<>)
+	for (auto & [type, component_array] : this->components) {
+		// Make sure that the id (that we are looking for) is within the boundaries of the vector<>
+		if (id < component_array.size()) {
+			// Clear the components at this specific id
+			component_array[id].clear();
+		}
+	}
+}
+
+void ComponentManager::delete_all_components() {
+	// Loop through all the types (in the unordered_map<>)
+	for (auto & [type, component_array] : this->components) {
+		// Loop through all the ids (in the vector<>)
+		for (game_object_id_t id = 0; id < component_array.size(); id++) {
+			// Do not delete persistent objects
+			if (!this->persistent[id]) {
+				// Clear the components at this specific id
+				component_array[id].clear();
+			}
+		}
+	}
+
+	this->next_id = 0;
+}
+
+GameObject ComponentManager::new_object(const string & name, const string & tag,
+										const vec2 & position, double rotation, double scale) {
+	// Find the first available id (taking persistent objects into account)
+	while (this->persistent[this->next_id]) {
+		this->next_id++;
+	}
+
+	GameObject object{*this, this->next_id, name, tag, position, rotation, scale};
+	this->next_id++;
+
+	return object;
+}
+
+void ComponentManager::set_persistent(game_object_id_t id, bool persistent) {
+	this->persistent[id] = persistent;
+}
diff --git a/src/crepe/ComponentManager.h b/src/crepe/manager/ComponentManager.h
index 1cb0b5f..ad37586 100644
--- a/src/crepe/ComponentManager.h
+++ b/src/crepe/manager/ComponentManager.h
@@ -5,8 +5,10 @@
 #include <unordered_map>
 #include <vector>
 
-#include "Component.h"
-#include "types.h"
+#include "../Component.h"
+#include "../types.h"
+
+#include "Manager.h"
 
 namespace crepe {
 
@@ -17,7 +19,7 @@ class GameObject;
  * 
  * This class manages all components. It provides methods to add, delete and get components.
  */
-class ComponentManager {
+class ComponentManager : public Manager {
 	// TODO: This relation should be removed! I (loek) believe that the scene manager should
 	// create/destroy components because the GameObject's are stored in concrete Scene classes,
 	// which will in turn call GameObject's destructor, which will in turn call
@@ -26,7 +28,7 @@ class ComponentManager {
 	friend class SceneManager;
 
 public:
-	ComponentManager(); // dbg_trace
+	ComponentManager(Mediator & mediator);
 	~ComponentManager(); // dbg_trace
 
 	/**
@@ -99,6 +101,16 @@ protected:
 	 * This method deletes all components.
 	 */
 	void delete_all_components();
+	/**
+	 * \brief Set a GameObject as persistent
+	 *
+	 * This method sets a GameObject as persistent. If a GameObject is persistent, its
+	 * components will not be deleted.
+	 *
+	 * \param id The id of the GameObject to set as persistent
+	 * \param persistent The persistent flag
+	 */
+	void set_persistent(game_object_id_t id, bool persistent);
 
 public:
 	/**
@@ -137,6 +149,9 @@ private:
 	std::unordered_map<std::type_index, std::vector<std::vector<std::unique_ptr<Component>>>>
 		components;
 
+	//! Persistent flag for each GameObject
+	std::unordered_map<game_object_id_t, bool> persistent;
+
 	//! ID of next GameObject allocated by \c ComponentManager::new_object
 	game_object_id_t next_id = 0;
 };
diff --git a/src/crepe/ComponentManager.hpp b/src/crepe/manager/ComponentManager.hpp
index 4d5eaf4..ffb38ec 100644
--- a/src/crepe/ComponentManager.hpp
+++ b/src/crepe/manager/ComponentManager.hpp
@@ -54,6 +54,11 @@ template <typename T>
 void ComponentManager::delete_components_by_id(game_object_id_t id) {
 	using namespace std;
 
+	// Do not delete persistent objects
+	if (this->persistent[id]) {
+		return;
+	}
+
 	// Determine the type of T (this is used as the key of the unordered_map<>)
 	type_index type = typeid(T);
 
@@ -77,7 +82,13 @@ void ComponentManager::delete_components() {
 
 	if (this->components.find(type) == this->components.end()) return;
 
-	this->components[type].clear();
+	// Loop through the whole vector<> of this specific type
+	for (game_object_id_t i = 0; i < this->components[type].size(); ++i) {
+		// Do not delete persistent objects
+		if (!this->persistent[i]) {
+			this->components[type][i].clear();
+		}
+	}
 }
 
 template <typename T>
diff --git a/src/crepe/api/EventManager.cpp b/src/crepe/manager/EventManager.cpp
index 20f0dd3..20f0dd3 100644
--- a/src/crepe/api/EventManager.cpp
+++ b/src/crepe/manager/EventManager.cpp
diff --git a/src/crepe/api/EventManager.h b/src/crepe/manager/EventManager.h
index 1a33023..d634f54 100644
--- a/src/crepe/api/EventManager.h
+++ b/src/crepe/manager/EventManager.h
@@ -5,8 +5,8 @@
 #include <unordered_map>
 #include <vector>
 
-#include "Event.h"
-#include "EventHandler.h"
+#include "../api/Event.h"
+#include "../api/EventHandler.h"
 
 namespace crepe {
 
diff --git a/src/crepe/api/EventManager.hpp b/src/crepe/manager/EventManager.hpp
index a5f4556..a5f4556 100644
--- a/src/crepe/api/EventManager.hpp
+++ b/src/crepe/manager/EventManager.hpp
diff --git a/src/crepe/manager/Manager.cpp b/src/crepe/manager/Manager.cpp
new file mode 100644
index 0000000..fe7c936
--- /dev/null
+++ b/src/crepe/manager/Manager.cpp
@@ -0,0 +1,6 @@
+#include "Manager.h"
+
+using namespace crepe;
+
+Manager::Manager(Mediator & mediator) : mediator(mediator) { }
+
diff --git a/src/crepe/manager/Manager.h b/src/crepe/manager/Manager.h
new file mode 100644
index 0000000..9adfd0b
--- /dev/null
+++ b/src/crepe/manager/Manager.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include "Mediator.h"
+
+namespace crepe {
+
+class Manager {
+public:
+	Manager(Mediator & mediator);
+	virtual ~Manager() = default;
+
+protected:
+	Mediator & mediator;
+};
+
+}
+
diff --git a/src/crepe/manager/Mediator.h b/src/crepe/manager/Mediator.h
new file mode 100644
index 0000000..475aed9
--- /dev/null
+++ b/src/crepe/manager/Mediator.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include "../util/OptionalRef.h"
+
+// TODO: remove these singletons:
+#include "SaveManager.h"
+#include "EventManager.h"
+
+namespace crepe {
+
+class ComponentManager;
+class SceneManager;
+class ResourceManager;
+
+/**
+ * Struct to pass references to classes that would otherwise need to be singletons down to
+ * other classes within the engine hierarchy. Made to prevent constant changes to subclasses to
+ * pass specific references through dependency injection. All references on this struct
+ * *should* be explicitly checked for availability as this struct does not guarantee anything.
+ *
+ * \note Dereferencing members of this struct should be deferred. If you are a user of this
+ * class, keep a reference to this mediator instead of just picking references from it when you
+ * receive an instance.
+ *
+ * \warning This class should never be directly accessible from the API
+ */
+struct Mediator {
+	OptionalRef<ComponentManager> component_manager;
+	OptionalRef<SceneManager> scene_manager;
+	OptionalRef<SaveManager> save_manager = SaveManager::get_instance();
+	OptionalRef<EventManager> event_manager = EventManager::get_instance();
+	OptionalRef<ResourceManager> resource_manager;
+};
+
+}
diff --git a/src/crepe/ResourceManager.cpp b/src/crepe/manager/ResourceManager.cpp
index 8b1fbf5..87585ad 100644
--- a/src/crepe/ResourceManager.cpp
+++ b/src/crepe/manager/ResourceManager.cpp
@@ -5,8 +5,11 @@
 using namespace crepe;
 using namespace std;
 
+ResourceManager::ResourceManager(Mediator & mediator) : Manager(mediator) {
+	mediator.resource_manager = *this;
+	dbg_trace();
+}
 ResourceManager::~ResourceManager() { dbg_trace(); }
-ResourceManager::ResourceManager() { dbg_trace(); }
 
 void ResourceManager::clear() {
 	std::erase_if(this->resources, [](const pair<const Asset, CacheEntry> & pair) {
diff --git a/src/crepe/ResourceManager.h b/src/crepe/manager/ResourceManager.h
index fc50b65..e7e6abc 100644
--- a/src/crepe/ResourceManager.h
+++ b/src/crepe/manager/ResourceManager.h
@@ -3,9 +3,10 @@
 #include <memory>
 #include <unordered_map>
 
-#include "api/Asset.h"
+#include "../Resource.h"
+#include "../api/Asset.h"
 
-#include "Resource.h"
+#include "Manager.h"
 
 namespace crepe {
 
@@ -18,9 +19,9 @@ namespace crepe {
  * a scene is loaded. Assets are retained in memory until the ResourceManager is
  * destroyed, at which point the cached assets are cleared.
  */
-class ResourceManager {
+class ResourceManager : public Manager {
 public:
-	ResourceManager(); // dbg_trace
+	ResourceManager(Mediator & mediator);
 	virtual ~ResourceManager(); // dbg_trace
 
 private:
diff --git a/src/crepe/ResourceManager.hpp b/src/crepe/manager/ResourceManager.hpp
index 8270bc5..8270bc5 100644
--- a/src/crepe/ResourceManager.hpp
+++ b/src/crepe/manager/ResourceManager.hpp
diff --git a/src/crepe/api/SaveManager.cpp b/src/crepe/manager/SaveManager.cpp
index c5f43ea..121d017 100644
--- a/src/crepe/api/SaveManager.cpp
+++ b/src/crepe/manager/SaveManager.cpp
@@ -1,9 +1,9 @@
 #include "../facade/DB.h"
 #include "../util/Log.h"
+#include "../api/Config.h"
+#include "../ValueBroker.h"
 
-#include "Config.h"
 #include "SaveManager.h"
-#include "ValueBroker.h"
 
 using namespace std;
 using namespace crepe;
diff --git a/src/crepe/api/SaveManager.h b/src/crepe/manager/SaveManager.h
index 3d8c852..3d8c852 100644
--- a/src/crepe/api/SaveManager.h
+++ b/src/crepe/manager/SaveManager.h
diff --git a/src/crepe/api/SceneManager.cpp b/src/crepe/manager/SceneManager.cpp
index 1f783ad..50a9fbb 100644
--- a/src/crepe/api/SceneManager.cpp
+++ b/src/crepe/manager/SceneManager.cpp
@@ -1,14 +1,15 @@
 #include <algorithm>
 #include <memory>
 
-#include "../ComponentManager.h"
-
+#include "ComponentManager.h"
 #include "SceneManager.h"
 
 using namespace crepe;
 using namespace std;
 
-SceneManager::SceneManager(ComponentManager & mgr) : component_manager(mgr) {}
+SceneManager::SceneManager(Mediator & mediator) : Manager(mediator) {
+	mediator.scene_manager = *this;
+}
 
 void SceneManager::set_next_scene(const string & name) { next_scene = name; }
 
@@ -26,7 +27,7 @@ void SceneManager::load_next_scene() {
 	unique_ptr<Scene> & scene = *it;
 
 	// Delete all components of the current scene
-	ComponentManager & mgr = this->component_manager;
+	ComponentManager & mgr = this->mediator.component_manager;
 	mgr.delete_all_components();
 
 	// Load the new scene
diff --git a/src/crepe/api/SceneManager.h b/src/crepe/manager/SceneManager.h
index f6f62cd..e0955c2 100644
--- a/src/crepe/api/SceneManager.h
+++ b/src/crepe/manager/SceneManager.h
@@ -3,7 +3,9 @@
 #include <memory>
 #include <vector>
 
-#include "Scene.h"
+#include "../api/Scene.h"
+
+#include "Manager.h"
 
 namespace crepe {
 
@@ -15,10 +17,9 @@ class ComponentManager;
  * This class manages scenes. It can add new scenes and load them. It also manages the current scene
  * and the next scene.
  */
-class SceneManager {
+class SceneManager : public Manager {
 public:
-	//! \param mgr  Reference to the ComponentManager
-	SceneManager(ComponentManager & mgr);
+	SceneManager(Mediator & mediator);
 
 public:
 	/**
@@ -44,8 +45,6 @@ private:
 	std::vector<std::unique_ptr<Scene>> scenes;
 	//! Next scene to load
 	std::string next_scene;
-	//! Reference to the ComponentManager
-	ComponentManager & component_manager;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/SceneManager.hpp b/src/crepe/manager/SceneManager.hpp
index 5c8e417..dff4e51 100644
--- a/src/crepe/api/SceneManager.hpp
+++ b/src/crepe/manager/SceneManager.hpp
@@ -12,7 +12,7 @@ void SceneManager::add_scene(Args &&... args) {
 	Scene * scene = new T(std::forward<Args>(args)...);
 	unique_ptr<Scene> unique_scene(scene);
 
-	unique_scene->component_manager = this->component_manager;
+	unique_scene->mediator = this->mediator;
 
 	this->scenes.emplace_back(std::move(unique_scene));
 
diff --git a/src/crepe/system/AnimatorSystem.cpp b/src/crepe/system/AnimatorSystem.cpp
index 676e485..8bb6465 100644
--- a/src/crepe/system/AnimatorSystem.cpp
+++ b/src/crepe/system/AnimatorSystem.cpp
@@ -1,24 +1,24 @@
 #include <cstdint>
 
-#include "api/Animator.h"
-#include "facade/SDLContext.h"
+#include "../api/Animator.h"
+#include "../facade/SDLContext.h"
+#include "../manager/ComponentManager.h"
 
 #include "AnimatorSystem.h"
-#include "ComponentManager.h"
 
 using namespace crepe;
 
 void AnimatorSystem::update() {
-	ComponentManager & mgr = this->component_manager;
+	ComponentManager & mgr = this->mediator.component_manager;
 
 	RefVector<Animator> animations = mgr.get_components_by_type<Animator>();
 
 	uint64_t tick = SDLContext::get_instance().get_ticks();
 	for (Animator & a : animations) {
-		if (a.active) {
-			a.curr_row = (tick / 100) % a.row;
-			a.animator_rect.x = (a.curr_row * a.animator_rect.w) + a.curr_col;
-			a.spritesheet.sprite_rect = a.animator_rect;
-		}
+		if (!a.active) continue;
+		// (10 frames per second)
+		a.curr_row = (tick / 100) % a.row;
+		a.spritesheet.mask.x = (a.curr_row * a.spritesheet.mask.w) + a.curr_col;
+		a.spritesheet.mask = a.spritesheet.mask;
 	}
 }
diff --git a/src/crepe/system/AnimatorSystem.h b/src/crepe/system/AnimatorSystem.h
index 56cc7b3..f8179a9 100644
--- a/src/crepe/system/AnimatorSystem.h
+++ b/src/crepe/system/AnimatorSystem.h
@@ -21,12 +21,11 @@ public:
 	/**
 	 * \brief Updates the Animator components.
 	 *
-	 * This method is called periodically (likely every frame) to update the state of all
+	 * This method is called to update the state of all
 	 * Animator components, moving the animations forward and managing their behavior (e.g.,
 	 * looping).
 	 */
 	void update() override;
-	// FIXME: never say "likely" in the documentation lmao
 };
 
 } // namespace crepe
diff --git a/src/crepe/system/AudioSystem.cpp b/src/crepe/system/AudioSystem.cpp
index f90132a..97cf966 100644
--- a/src/crepe/system/AudioSystem.cpp
+++ b/src/crepe/system/AudioSystem.cpp
@@ -1,20 +1,23 @@
 #include "AudioSystem.h"
-#include "ComponentManager.h"
 
 #include "../api/AudioSource.h"
+#include "../manager/ComponentManager.h"
+#include "../manager/ResourceManager.h"
+#include "../types.h"
 
 using namespace crepe;
 using namespace std;
 
 void AudioSystem::update() {
-	ComponentManager & mgr = this->component_manager;
-	vector<reference_wrapper<AudioSource>> components = mgr.get_components_by_type<AudioSource>();
+	ComponentManager & component_manager = this->mediator.component_manager;
+	ResourceManager & resource_manager = this->mediator.resource_manager;
+	RefVector<AudioSource> components = component_manager.get_components_by_type<AudioSource>();
 
 	for (auto component_ref : components) {
 		AudioSource & component = component_ref.get();
 		if (!component.active) continue;
 
-		Sound & sound = this->resource_manager.get<Sound>(component.source);
+		Sound & sound = resource_manager.get<Sound>(component.source);
 		// TODO: lots of state diffing
 	}
 }
diff --git a/src/crepe/system/AudioSystem.h b/src/crepe/system/AudioSystem.h
index d3d5aeb..e037f51 100644
--- a/src/crepe/system/AudioSystem.h
+++ b/src/crepe/system/AudioSystem.h
@@ -1,7 +1,6 @@
 #pragma once
 
 #include "../facade/SoundContext.h"
-#include "../ResourceManager.h"
 
 #include "System.h"
 
@@ -14,7 +13,6 @@ public:
 
 private:
 	SoundContext context {};
-	ResourceManager resource_manager {};
 };
 
 } // namespace crepe
diff --git a/src/crepe/system/ParticleSystem.cpp b/src/crepe/system/ParticleSystem.cpp
index 0e62a57..b14c52f 100644
--- a/src/crepe/system/ParticleSystem.cpp
+++ b/src/crepe/system/ParticleSystem.cpp
@@ -2,17 +2,17 @@
 #include <cstdlib>
 #include <ctime>
 
-#include "api/ParticleEmitter.h"
-#include "api/Transform.h"
+#include "../api/ParticleEmitter.h"
+#include "../api/Transform.h"
+#include "../manager/ComponentManager.h"
 
-#include "ComponentManager.h"
 #include "ParticleSystem.h"
 
 using namespace crepe;
 
 void ParticleSystem::update() {
 	// Get all emitters
-	ComponentManager & mgr = this->component_manager;
+	ComponentManager & mgr = this->mediator.component_manager;
 	RefVector<ParticleEmitter> emitters = mgr.get_components_by_type<ParticleEmitter>();
 
 	for (ParticleEmitter & emitter : emitters) {
diff --git a/src/crepe/system/PhysicsSystem.cpp b/src/crepe/system/PhysicsSystem.cpp
index 514a4b3..eba9dfa 100644
--- a/src/crepe/system/PhysicsSystem.cpp
+++ b/src/crepe/system/PhysicsSystem.cpp
@@ -1,6 +1,6 @@
 #include <cmath>
 
-#include "../ComponentManager.h"
+#include "../manager/ComponentManager.h"
 #include "../api/Config.h"
 #include "../api/Rigidbody.h"
 #include "../api/Transform.h"
@@ -11,7 +11,7 @@
 using namespace crepe;
 
 void PhysicsSystem::update() {
-	ComponentManager & mgr = this->component_manager;
+	ComponentManager & mgr = this->mediator.component_manager;
 	RefVector<Rigidbody> rigidbodies = mgr.get_components_by_type<Rigidbody>();
 	RefVector<Transform> transforms = mgr.get_components_by_type<Transform>();
 
diff --git a/src/crepe/system/RenderSystem.cpp b/src/crepe/system/RenderSystem.cpp
index ad510f5..4e97b3e 100644
--- a/src/crepe/system/RenderSystem.cpp
+++ b/src/crepe/system/RenderSystem.cpp
@@ -2,15 +2,14 @@
 #include <cassert>
 #include <cmath>
 #include <functional>
-#include <iostream>
 #include <stdexcept>
 #include <vector>
 
-#include "../ComponentManager.h"
+#include "../manager/ComponentManager.h"
+#include "../api/Camera.h"
 #include "../api/ParticleEmitter.h"
 #include "../api/Sprite.h"
 #include "../api/Transform.h"
-#include "../api/Vector2.h"
 #include "../facade/SDLContext.h"
 
 #include "RenderSystem.h"
@@ -21,8 +20,9 @@ using namespace std;
 void RenderSystem::clear_screen() { this->context.clear_screen(); }
 
 void RenderSystem::present_screen() { this->context.present_screen(); }
-void RenderSystem::update_camera() {
-	ComponentManager & mgr = this->component_manager;
+
+const Camera & RenderSystem::update_camera() {
+	ComponentManager & mgr = this->mediator.component_manager;
 
 	RefVector<Camera> cameras = mgr.get_components_by_type<Camera>();
 
@@ -30,9 +30,13 @@ void RenderSystem::update_camera() {
 
 	for (Camera & cam : cameras) {
 		if (!cam.active) continue;
+		const Transform & transform
+			= mgr.get_components_by_id<Transform>(cam.game_object_id).front().get();
 		this->context.set_camera(cam);
-		this->curr_cam_ref = &cam;
+		this->cam_pos = transform.position + cam.offset;
+		return cam;
 	}
+	throw std::runtime_error("No active cameras in current scene");
 }
 
 bool sorting_comparison(const Sprite & a, const Sprite & b) {
@@ -51,14 +55,14 @@ RefVector<Sprite> RenderSystem::sort(RefVector<Sprite> & objs) const {
 
 void RenderSystem::update() {
 	this->clear_screen();
-	this->update_camera();
 	this->render();
 	this->present_screen();
 }
 
-bool RenderSystem::render_particle(const Sprite & sprite, const double & scale) {
+bool RenderSystem::render_particle(const Sprite & sprite, const Camera & cam,
+								   const double & scale) {
 
-	ComponentManager & mgr = this->component_manager;
+	ComponentManager & mgr = this->mediator.component_manager;
 
 	vector<reference_wrapper<ParticleEmitter>> emitters
 		= mgr.get_components_by_id<ParticleEmitter>(sprite.game_object_id);
@@ -72,19 +76,35 @@ bool RenderSystem::render_particle(const Sprite & sprite, const double & scale)
 
 		for (const Particle & p : em.data.particles) {
 			if (!p.active) continue;
-			this->context.draw_particle(sprite, p.position, p.angle, scale,
-										*this->curr_cam_ref);
+
+			this->context.draw(SDLContext::RenderContext{
+				.sprite = sprite,
+				.cam = cam,
+				.cam_pos = this->cam_pos,
+				.pos = p.position,
+				.angle = p.angle,
+				.scale = scale,
+			});
 		}
 	}
 	return rendering_particles;
 }
-void RenderSystem::render_normal(const Sprite & sprite, const Transform & tm) {
-	this->context.draw(sprite, tm, *this->curr_cam_ref);
+void RenderSystem::render_normal(const Sprite & sprite, const Camera & cam,
+								 const Transform & tm) {
+	this->context.draw(SDLContext::RenderContext{
+		.sprite = sprite,
+		.cam = cam,
+		.cam_pos = this->cam_pos,
+		.pos = tm.position,
+		.angle = tm.rotation,
+		.scale = tm.scale,
+	});
 }
 
 void RenderSystem::render() {
+	ComponentManager & mgr = this->mediator.component_manager;
+	const Camera & cam = this->update_camera();
 
-	ComponentManager & mgr = this->component_manager;
 	RefVector<Sprite> sprites = mgr.get_components_by_type<Sprite>();
 	RefVector<Sprite> sorted_sprites = this->sort(sprites);
 
@@ -93,10 +113,10 @@ void RenderSystem::render() {
 		const Transform & transform
 			= mgr.get_components_by_id<Transform>(sprite.game_object_id).front().get();
 
-		bool rendered_particles = this->render_particle(sprite, transform.scale);
+		bool rendered_particles = this->render_particle(sprite, cam, transform.scale);
 
 		if (rendered_particles) continue;
 
-		this->render_normal(sprite, transform);
+		this->render_normal(sprite, cam, transform);
 	}
 }
diff --git a/src/crepe/system/RenderSystem.h b/src/crepe/system/RenderSystem.h
index 30b41cf..e70831e 100644
--- a/src/crepe/system/RenderSystem.h
+++ b/src/crepe/system/RenderSystem.h
@@ -1,17 +1,17 @@
 #pragma once
 
-#include <functional>
-#include <vector>
+#include <cmath>
 
 #include "facade/SDLContext.h"
 
 #include "System.h"
-#include <cmath>
+#include "types.h"
 
 namespace crepe {
 
 class Camera;
 class Sprite;
+class Transform;
 
 /**
  * \class RenderSystem
@@ -37,7 +37,7 @@ private:
 	void present_screen();
 
 	//! Updates the active camera used for rendering.
-	void update_camera();
+	const Camera & update_camera();
 
 	//! Renders the whole screen
 	void render();
@@ -49,7 +49,7 @@ private:
 	 * \param tm the Transform component for scale
 	 * \return true if particles have been rendered
 	 */
-	bool render_particle(const Sprite & sprite, const double & scale);
+	bool render_particle(const Sprite & sprite, const Camera & cam, const double & scale);
 
 	/**
 	 * \brief renders a sprite with a Transform component on the screen 
@@ -57,7 +57,7 @@ private:
 	 * \param sprite  the sprite component that holds all the data
 	 * \param tm the Transform component that holds the position,rotation and scale 
 	 */
-	void render_normal(const Sprite & sprite, const Transform & tm);
+	void render_normal(const Sprite & sprite, const Camera & cam, const Transform & tm);
 
 	/**
 	 * \brief sort a vector sprite objects with
@@ -71,17 +71,14 @@ private:
 	 * \todo Include color handling for sprites.
 	 * \todo Add text rendering using SDL_ttf for text components.
 	 * \todo Implement a text component and a button component.
-	 * \todo Ensure each sprite is checked for active status before rendering.
-	 * \todo Sort all layers by order before rendering.
 	 * \todo Consider adding text input functionality.
 	 */
 
 private:
-	//! Pointer to the current active camera for rendering
-	Camera * curr_cam_ref = nullptr;
-	// TODO: needs a better solution
-
 	SDLContext & context = SDLContext::get_instance();
+
+	//! camera postion in the current scene
+	vec2 cam_pos;
 };
 
 } // namespace crepe
diff --git a/src/crepe/system/ScriptSystem.cpp b/src/crepe/system/ScriptSystem.cpp
index 20a83f7..2e16eb0 100644
--- a/src/crepe/system/ScriptSystem.cpp
+++ b/src/crepe/system/ScriptSystem.cpp
@@ -1,4 +1,4 @@
-#include "../ComponentManager.h"
+#include "../manager/ComponentManager.h"
 #include "../api/BehaviorScript.h"
 #include "../api/Script.h"
 
@@ -10,7 +10,7 @@ using namespace crepe;
 void ScriptSystem::update() {
 	dbg_trace();
 
-	ComponentManager & mgr = this->component_manager;
+	ComponentManager & mgr = this->mediator.component_manager;
 	RefVector<BehaviorScript> behavior_scripts = mgr.get_components_by_type<BehaviorScript>();
 
 	for (BehaviorScript & behavior_script : behavior_scripts) {
diff --git a/src/crepe/system/System.cpp b/src/crepe/system/System.cpp
index 937a423..f68549b 100644
--- a/src/crepe/system/System.cpp
+++ b/src/crepe/system/System.cpp
@@ -4,4 +4,4 @@
 
 using namespace crepe;
 
-System::System(ComponentManager & mgr) : component_manager(mgr) { dbg_trace(); }
+System::System(const Mediator & mediator) : mediator(mediator) { dbg_trace(); }
diff --git a/src/crepe/system/System.h b/src/crepe/system/System.h
index 28ea20e..4e7fc6d 100644
--- a/src/crepe/system/System.h
+++ b/src/crepe/system/System.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include "../manager/Mediator.h"
+
 namespace crepe {
 
 class ComponentManager;
@@ -19,11 +21,11 @@ public:
 	virtual void update() = 0;
 
 public:
-	System(ComponentManager &);
+	System(const Mediator & m);
 	virtual ~System() = default;
 
 protected:
-	ComponentManager & component_manager;
+	const Mediator & mediator;
 };
 
 } // namespace crepe
diff --git a/src/crepe/types.h b/src/crepe/types.h
index 17f1619..69cc526 100644
--- a/src/crepe/types.h
+++ b/src/crepe/types.h
@@ -27,4 +27,4 @@ typedef Vector2<float> vec2;
 //! Default Vector2<double> type
 typedef Vector2<double> dvec2;
 
-} // namespace crepe
+}; // namespace crepe
diff --git a/src/example/rendering_particle.cpp b/src/example/rendering_particle.cpp
index b38e860..3a12144 100644
--- a/src/example/rendering_particle.cpp
+++ b/src/example/rendering_particle.cpp
@@ -1,6 +1,7 @@
+#include "api/Animator.h"
 #include "api/Camera.h"
+#include "system/AnimatorSystem.h"
 #include "system/ParticleSystem.h"
-#include "types.h"
 #include <SDL2/SDL_timer.h>
 #include <crepe/ComponentManager.h>
 
@@ -12,28 +13,31 @@
 #include <crepe/api/Sprite.h>
 #include <crepe/api/Texture.h>
 #include <crepe/api/Transform.h>
-#include <crepe/api/Vector2.h>
 #include <crepe/system/RenderSystem.h>
+#include <crepe/types.h>
 
 #include <chrono>
-#include <iostream>
-#include <memory>
 
 using namespace crepe;
 using namespace std;
 
 int main(int argc, char * argv[]) {
 	ComponentManager mgr;
-	GameObject game_object = mgr.new_object("", "", vec2{0, 0}, 0, 0.1);
+	GameObject game_object = mgr.new_object("", "", vec2{0, 0}, 0, 1);
 	RenderSystem sys{mgr};
 	ParticleSystem psys{mgr};
+	AnimatorSystem asys{mgr};
 
 	Color color(255, 255, 255, 255);
 
+	auto img = Texture("asset/texture/test_ap43.png");
 	Sprite & test_sprite = game_object.add_component<Sprite>(
-		make_shared<Texture>("asset/texture/img.png"), color, FlipSettings{false, false});
-	test_sprite.order_in_layer = 5;
+		img, color, Sprite::FlipSettings{true, true}, 1, 1, 500);
 
+	//game_object.add_component<Animator>(test_sprite, 4, 1, 0).active = true;
+	game_object.add_component<Animator>(test_sprite, 1, 1, 0).active = true;
+
+	/*
 	auto & test = game_object.add_component<ParticleEmitter>(ParticleEmitter::Data{
 		.position = {0, 0},
 		.max_particles = 10,
@@ -53,17 +57,24 @@ int main(int argc, char * argv[]) {
 		},
 		.sprite = test_sprite,
 	});
-	game_object.add_component<Camera>(Color::WHITE);
+	*/
+
+	auto & cam = game_object.add_component<Camera>(Color::WHITE, ivec2{1080, 720},
+												   vec2{2000, 2000}, 1.0f);
 
+	/*
 	game_object
 		.add_component<Sprite>(make_shared<Texture>("asset/texture/img.png"), color,
+		.add_component<Sprite>(make_shared<Texture>("asset/texture/img.png"), color,
 							   FlipSettings{false, false})
 		.order_in_layer
 		= 6;
+	*/
 
 	auto start = std::chrono::steady_clock::now();
 	while (std::chrono::steady_clock::now() - start < std::chrono::seconds(5)) {
 		psys.update();
+		asys.update();
 		sys.update();
 		SDL_Delay(10);
 	}
diff --git a/src/test/AudioTest.cpp b/src/test/AudioTest.cpp
index e181de9..afd2672 100644
--- a/src/test/AudioTest.cpp
+++ b/src/test/AudioTest.cpp
@@ -1,6 +1,6 @@
 #include <gtest/gtest.h>
 
-#include <crepe/ComponentManager.h>
+#include <crepe/manager/ComponentManager.h>
 #include <crepe/api/AudioSource.h>
 #include <crepe/api/GameObject.h>
 #include <crepe/system/AudioSystem.h>
@@ -10,9 +10,10 @@ using namespace crepe;
 using namespace testing;
 
 class AudioTest : public Test {
+	Mediator mediator;
 public:
-	ComponentManager component_manager{};
-	AudioSystem system {component_manager};
+	ComponentManager component_manager{mediator};
+	AudioSystem system {mediator};
 
 	void SetUp() override {
 		auto & mgr = this->component_manager;
diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
index b67baad..4174926 100644
--- a/src/test/CMakeLists.txt
+++ b/src/test/CMakeLists.txt
@@ -14,4 +14,6 @@ target_sources(test_main PUBLIC
 	ValueBrokerTest.cpp
 	DBTest.cpp
 	Vector2Test.cpp
+	ScriptEventTest.cpp
+	ScriptSceneTest.cpp
 )
diff --git a/src/test/DBTest.cpp b/src/test/DBTest.cpp
index e80814c..99dedff 100644
--- a/src/test/DBTest.cpp
+++ b/src/test/DBTest.cpp
@@ -1,6 +1,7 @@
-#include <crepe/facade/DB.h>
 #include <gtest/gtest.h>
 
+#include <crepe/facade/DB.h>
+
 using namespace std;
 using namespace crepe;
 using namespace testing;
diff --git a/src/test/ECSTest.cpp b/src/test/ECSTest.cpp
index 80b936b..22c4fe7 100644
--- a/src/test/ECSTest.cpp
+++ b/src/test/ECSTest.cpp
@@ -2,7 +2,7 @@
 
 #define protected public
 
-#include <crepe/ComponentManager.h>
+#include <crepe/manager/ComponentManager.h>
 #include <crepe/api/GameObject.h>
 #include <crepe/api/Metadata.h>
 #include <crepe/api/Transform.h>
@@ -12,8 +12,9 @@ using namespace std;
 using namespace crepe;
 
 class ECSTest : public ::testing::Test {
+	Mediator m;
 public:
-	ComponentManager mgr{};
+	ComponentManager mgr{m};
 };
 
 TEST_F(ECSTest, createGameObject) {
@@ -136,6 +137,53 @@ TEST_F(ECSTest, manyGameObjects) {
 
 	EXPECT_EQ(metadata.size(), 10000 - 5000);
 	EXPECT_EQ(transform.size(), 10000);
+
+	for (int i = 0; i < 10000 - 5000; i++) {
+		EXPECT_EQ(metadata[i].get().game_object_id, i + 5000);
+		EXPECT_EQ(metadata[i].get().name, "body");
+		EXPECT_EQ(metadata[i].get().tag, "person" + to_string(i));
+		EXPECT_EQ(metadata[i].get().parent, -1);
+		EXPECT_EQ(metadata[i].get().children.size(), 0);
+
+		EXPECT_EQ(transform[i].get().game_object_id, i);
+		EXPECT_EQ(transform[i].get().position.x, 0);
+		EXPECT_EQ(transform[i].get().position.y, 0);
+		EXPECT_EQ(transform[i].get().rotation, 0);
+		EXPECT_EQ(transform[i].get().scale, i);
+	}
+
+	mgr.delete_all_components();
+
+	metadata = mgr.get_components_by_type<Metadata>();
+	transform = mgr.get_components_by_type<Transform>();
+
+	EXPECT_EQ(metadata.size(), 0);
+	EXPECT_EQ(transform.size(), 0);
+
+	for (int i = 0; i < 10000; i++) {
+		string name = "body" + to_string(i);
+		GameObject obj = mgr.new_object(name, "person", vec2{0, 0}, 0, 0);
+	}
+
+	metadata = mgr.get_components_by_type<Metadata>();
+	transform = mgr.get_components_by_type<Transform>();
+
+	EXPECT_EQ(metadata.size(), 10000);
+	EXPECT_EQ(transform.size(), 10000);
+
+	for (int i = 0; i < 10000; i++) {
+		EXPECT_EQ(metadata[i].get().game_object_id, i);
+		EXPECT_EQ(metadata[i].get().name, "body" + to_string(i));
+		EXPECT_EQ(metadata[i].get().tag, "person");
+		EXPECT_EQ(metadata[i].get().parent, -1);
+		EXPECT_EQ(metadata[i].get().children.size(), 0);
+
+		EXPECT_EQ(transform[i].get().game_object_id, i);
+		EXPECT_EQ(transform[i].get().position.x, 0);
+		EXPECT_EQ(transform[i].get().position.y, 0);
+		EXPECT_EQ(transform[i].get().rotation, 0);
+		EXPECT_EQ(transform[i].get().scale, 0);
+	}
 }
 
 TEST_F(ECSTest, getComponentsByID) {
@@ -234,3 +282,107 @@ TEST_F(ECSTest, partentChild) {
 	EXPECT_EQ(metadata[1].get().children[0], 3);
 	EXPECT_EQ(metadata[2].get().children[0], 4);
 }
+
+TEST_F(ECSTest, persistent) {
+	GameObject obj0 = mgr.new_object("obj0", "obj0", vec2{0, 0}, 0, 1);
+	GameObject obj1 = mgr.new_object("obj1", "obj1", vec2{0, 0}, 0, 1);
+	obj1.set_persistent();
+	GameObject obj2 = mgr.new_object("obj2", "obj2", vec2{0, 0}, 0, 1);
+
+	vector<reference_wrapper<Metadata>> metadata = mgr.get_components_by_type<Metadata>();
+	vector<reference_wrapper<Transform>> transform = mgr.get_components_by_type<Transform>();
+
+	EXPECT_EQ(metadata.size(), 3);
+	EXPECT_EQ(transform.size(), 3);
+
+	mgr.delete_components_by_id<Metadata>(1);
+	mgr.delete_components<Metadata>();
+	mgr.delete_all_components_of_id(1);
+
+	metadata = mgr.get_components_by_type<Metadata>();
+	transform = mgr.get_components_by_type<Transform>();
+
+	EXPECT_EQ(metadata.size(), 1);
+	EXPECT_EQ(transform.size(), 3);
+
+	mgr.delete_all_components();
+
+	metadata = mgr.get_components_by_type<Metadata>();
+	transform = mgr.get_components_by_type<Transform>();
+
+	EXPECT_EQ(metadata.size(), 1);
+	EXPECT_EQ(transform.size(), 1);
+
+	EXPECT_EQ(metadata[0].get().game_object_id, 1);
+	EXPECT_EQ(metadata[0].get().name, "obj1");
+	EXPECT_EQ(metadata[0].get().tag, "obj1");
+	EXPECT_EQ(metadata[0].get().parent, -1);
+	EXPECT_EQ(metadata[0].get().children.size(), 0);
+
+	EXPECT_EQ(transform[0].get().game_object_id, 1);
+	EXPECT_EQ(transform[0].get().position.x, 0);
+	EXPECT_EQ(transform[0].get().position.y, 0);
+
+	GameObject obj3 = mgr.new_object("obj3", "obj3", vec2{0, 0}, 0, 5);
+	GameObject obj4 = mgr.new_object("obj4", "obj4", vec2{0, 0}, 0, 5);
+
+	metadata = mgr.get_components_by_type<Metadata>();
+	transform = mgr.get_components_by_type<Transform>();
+
+	EXPECT_EQ(metadata.size(), 3);
+	EXPECT_EQ(transform.size(), 3);
+
+	EXPECT_EQ(metadata[0].get().game_object_id, 0);
+	EXPECT_EQ(metadata[0].get().name, "obj3");
+
+	EXPECT_EQ(metadata[1].get().game_object_id, 1);
+	EXPECT_EQ(metadata[1].get().name, "obj1");
+
+	EXPECT_EQ(metadata[2].get().game_object_id, 2);
+	EXPECT_EQ(metadata[2].get().name, "obj4");
+
+	EXPECT_EQ(transform[0].get().game_object_id, 0);
+	EXPECT_EQ(transform[0].get().scale, 5);
+
+	EXPECT_EQ(transform[1].get().game_object_id, 1);
+	EXPECT_EQ(transform[1].get().scale, 1);
+
+	EXPECT_EQ(transform[2].get().game_object_id, 2);
+	EXPECT_EQ(transform[2].get().scale, 5);
+}
+
+TEST_F(ECSTest, resetPersistent) {
+	GameObject obj0 = mgr.new_object("obj0", "obj0", vec2{0, 0}, 0, 1);
+	GameObject obj1 = mgr.new_object("obj1", "obj1", vec2{0, 0}, 0, 1);
+	obj1.set_persistent();
+	GameObject obj2 = mgr.new_object("obj2", "obj2", vec2{0, 0}, 0, 1);
+
+	vector<reference_wrapper<Metadata>> metadata = mgr.get_components_by_type<Metadata>();
+	vector<reference_wrapper<Transform>> transform = mgr.get_components_by_type<Transform>();
+
+	EXPECT_EQ(metadata.size(), 3);
+	EXPECT_EQ(transform.size(), 3);
+
+	mgr.delete_all_components();
+
+	metadata = mgr.get_components_by_type<Metadata>();
+	transform = mgr.get_components_by_type<Transform>();
+
+	EXPECT_EQ(metadata.size(), 1);
+	EXPECT_EQ(transform.size(), 1);
+
+	vector<reference_wrapper<Metadata>> metadata_id = mgr.get_components_by_id<Metadata>(1);
+
+	EXPECT_EQ(metadata_id.size(), 1);
+	EXPECT_EQ(metadata_id[0].get().game_object_id, 1);
+	EXPECT_EQ(metadata_id[0].get().name, "obj1");
+
+	mgr.set_persistent(1, false);
+	mgr.delete_all_components();
+
+	metadata = mgr.get_components_by_type<Metadata>();
+	transform = mgr.get_components_by_type<Transform>();
+
+	EXPECT_EQ(metadata.size(), 0);
+	EXPECT_EQ(transform.size(), 0);
+}
diff --git a/src/test/EventTest.cpp b/src/test/EventTest.cpp
index a21a851..350dd07 100644
--- a/src/test/EventTest.cpp
+++ b/src/test/EventTest.cpp
@@ -1,10 +1,11 @@
-
-#include "api/Event.h"
-#include "api/EventManager.h"
-#include "api/IKeyListener.h"
-#include "api/IMouseListener.h"
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
+
+#include <crepe/api/Event.h>
+#include <crepe/manager/EventManager.h>
+#include <crepe/api/IKeyListener.h>
+#include <crepe/api/IMouseListener.h>
+
 using namespace std;
 using namespace std::chrono_literals;
 using namespace crepe;
diff --git a/src/test/ParticleTest.cpp b/src/test/ParticleTest.cpp
index 8b81e74..4e9fa4e 100644
--- a/src/test/ParticleTest.cpp
+++ b/src/test/ParticleTest.cpp
@@ -1,11 +1,11 @@
-#include "api/Vector2.h"
-#include <crepe/ComponentManager.h>
+#include <crepe/manager/ComponentManager.h>
 #include <crepe/Particle.h>
 #include <crepe/api/Config.h>
 #include <crepe/api/GameObject.h>
 #include <crepe/api/ParticleEmitter.h>
 #include <crepe/api/Rigidbody.h>
 #include <crepe/api/Sprite.h>
+#include <crepe/api/Texture.h>
 #include <crepe/api/Transform.h>
 #include <crepe/system/ParticleSystem.h>
 #include <gtest/gtest.h>
@@ -16,9 +16,10 @@ using namespace std::chrono_literals;
 using namespace crepe;
 
 class ParticlesTest : public ::testing::Test {
+	Mediator m;
 public:
-	ComponentManager component_manager;
-	ParticleSystem particle_system{component_manager};
+	ComponentManager component_manager{m};
+	ParticleSystem particle_system{m};
 
 	void SetUp() override {
 		ComponentManager & mgr = this->component_manager;
@@ -28,9 +29,9 @@ public:
 			GameObject game_object = mgr.new_object("", "", vec2{0, 0}, 0, 0);
 
 			Color color(0, 0, 0, 0);
+			auto s1 = Texture("asset/texture/img.png");
 			Sprite & test_sprite = game_object.add_component<Sprite>(
-				make_shared<Texture>("asset/texture/img.png"), color,
-				FlipSettings{true, true});
+				s1, color, Sprite::FlipSettings{true, true}, 1, 1, 100);
 
 			game_object.add_component<ParticleEmitter>(ParticleEmitter::Data{
 				.position = {0, 0},
diff --git a/src/test/PhysicsTest.cpp b/src/test/PhysicsTest.cpp
index 33b6020..01b7c51 100644
--- a/src/test/PhysicsTest.cpp
+++ b/src/test/PhysicsTest.cpp
@@ -1,4 +1,4 @@
-#include <crepe/ComponentManager.h>
+#include <crepe/manager/ComponentManager.h>
 #include <crepe/api/Config.h>
 #include <crepe/api/GameObject.h>
 #include <crepe/api/Rigidbody.h>
@@ -11,9 +11,10 @@ using namespace std::chrono_literals;
 using namespace crepe;
 
 class PhysicsTest : public ::testing::Test {
+	Mediator m;
 public:
-	ComponentManager component_manager;
-	PhysicsSystem system{component_manager};
+	ComponentManager component_manager{m};
+	PhysicsSystem system{m};
 
 	void SetUp() override {
 		ComponentManager & mgr = this->component_manager;
diff --git a/src/test/RenderSystemTest.cpp b/src/test/RenderSystemTest.cpp
index f37fb56..3528e46 100644
--- a/src/test/RenderSystemTest.cpp
+++ b/src/test/RenderSystemTest.cpp
@@ -1,4 +1,3 @@
-#include "api/Camera.h"
 #include <functional>
 #include <gtest/gtest.h>
 #include <memory>
@@ -7,7 +6,8 @@
 #define private public
 #define protected public
 
-#include <crepe/ComponentManager.h>
+#include <crepe/api/Camera.h>
+#include <crepe/manager/ComponentManager.h>
 #include <crepe/api/Color.h>
 #include <crepe/api/GameObject.h>
 #include <crepe/api/Sprite.h>
@@ -20,49 +20,40 @@ using namespace crepe;
 using namespace testing;
 
 class RenderSystemTest : public Test {
+	Mediator m;
 public:
-	ComponentManager mgr{};
-	RenderSystem sys{mgr};
+	ComponentManager mgr{m};
+	RenderSystem sys{m};
 	GameObject entity1 = this->mgr.new_object("name");
 	GameObject entity2 = this->mgr.new_object("name");
 	GameObject entity3 = this->mgr.new_object("name");
 	GameObject entity4 = this->mgr.new_object("name");
 
 	void SetUp() override {
-		auto & sprite1
-			= entity1.add_component<Sprite>(make_shared<Texture>("asset/texture/img.png"),
-											Color(0, 0, 0, 0), FlipSettings{false, false});
-		ASSERT_NE(sprite1.sprite_image.get(), nullptr);
-		sprite1.order_in_layer = 5;
-		sprite1.sorting_in_layer = 5;
+		auto s1 = Texture("asset/texture/img.png");
+		auto s2 = Texture("asset/texture/img.png");
+		auto s3 = Texture("asset/texture/img.png");
+		auto s4 = Texture("asset/texture/img.png");
+		auto & sprite1 = entity1.add_component<Sprite>(
+			s1, Color(0, 0, 0, 0), Sprite::FlipSettings{false, false}, 5, 5, 100);
+		ASSERT_NE(sprite1.sprite_image.texture.get(), nullptr);
 		EXPECT_EQ(sprite1.order_in_layer, 5);
 		EXPECT_EQ(sprite1.sorting_in_layer, 5);
-		auto & sprite2
-			= entity2.add_component<Sprite>(make_shared<Texture>("asset/texture/img.png"),
-											Color(0, 0, 0, 0), FlipSettings{false, false});
-		ASSERT_NE(sprite2.sprite_image.get(), nullptr);
-		sprite2.sorting_in_layer = 2;
-		sprite2.order_in_layer = 1;
-
+		auto & sprite2 = entity2.add_component<Sprite>(
+			s2, Color(0, 0, 0, 0), Sprite::FlipSettings{false, false}, 2, 1, 100);
+		ASSERT_NE(sprite2.sprite_image.texture.get(), nullptr);
 		EXPECT_EQ(sprite2.sorting_in_layer, 2);
 		EXPECT_EQ(sprite2.order_in_layer, 1);
 
-		auto & sprite3
-			= entity3.add_component<Sprite>(make_shared<Texture>("asset/texture/img.png"),
-											Color(0, 0, 0, 0), FlipSettings{false, false});
-		ASSERT_NE(sprite3.sprite_image.get(), nullptr);
-		sprite3.sorting_in_layer = 1;
-		sprite3.order_in_layer = 2;
-
+		auto & sprite3 = entity3.add_component<Sprite>(
+			s3, Color(0, 0, 0, 0), Sprite::FlipSettings{false, false}, 1, 2, 100);
+		ASSERT_NE(sprite3.sprite_image.texture.get(), nullptr);
 		EXPECT_EQ(sprite3.sorting_in_layer, 1);
 		EXPECT_EQ(sprite3.order_in_layer, 2);
 
-		auto & sprite4
-			= entity4.add_component<Sprite>(make_shared<Texture>("asset/texture/img.png"),
-											Color(0, 0, 0, 0), FlipSettings{false, false});
-		ASSERT_NE(sprite4.sprite_image.get(), nullptr);
-		sprite4.sorting_in_layer = 1;
-		sprite4.order_in_layer = 1;
+		auto & sprite4 = entity4.add_component<Sprite>(
+			s4, Color(0, 0, 0, 0), Sprite::FlipSettings{false, false}, 1, 1, 100);
+		ASSERT_NE(sprite4.sprite_image.texture.get(), nullptr);
 		EXPECT_EQ(sprite4.sorting_in_layer, 1);
 		EXPECT_EQ(sprite4.order_in_layer, 1);
 	}
@@ -73,8 +64,9 @@ TEST_F(RenderSystemTest, expected_throws) {
 
 	// no texture img
 	EXPECT_ANY_THROW({
-		entity1.add_component<Sprite>(make_shared<Texture>("NO_IMAGE"), Color(0, 0, 0, 0),
-									  FlipSettings{false, false});
+		auto test = Texture("");
+		entity1.add_component<Sprite>(test, Color(0, 0, 0, 0),
+									  Sprite::FlipSettings{false, false}, 1, 1, 100);
 	});
 
 	// No camera
@@ -121,7 +113,7 @@ TEST_F(RenderSystemTest, sorting_sprites) {
 }
 
 TEST_F(RenderSystemTest, Update) {
-	entity1.add_component<Camera>(Color::WHITE);
+	entity1.add_component<Camera>(Color::WHITE, ivec2{1080, 720}, vec2{2000, 2000}, 1.0f);
 	{
 		vector<reference_wrapper<Sprite>> sprites = this->mgr.get_components_by_type<Sprite>();
 		ASSERT_EQ(sprites.size(), 4);
@@ -149,7 +141,7 @@ TEST_F(RenderSystemTest, Camera) {
 		EXPECT_NE(cameras.size(), 1);
 	}
 	{
-		entity1.add_component<Camera>(Color::WHITE);
+		entity1.add_component<Camera>(Color::WHITE, ivec2{1080, 720}, vec2{2000, 2000}, 1.0f);
 		auto cameras = this->mgr.get_components_by_type<Camera>();
 		EXPECT_EQ(cameras.size(), 1);
 	}
@@ -157,9 +149,9 @@ TEST_F(RenderSystemTest, Camera) {
 	//TODO improve with newer version
 }
 TEST_F(RenderSystemTest, Color) {
-	entity1.add_component<Camera>(Color::WHITE);
+	entity1.add_component<Camera>(Color::WHITE, ivec2{1080, 720}, vec2{2000, 2000}, 1.0f);
 	auto & sprite = this->mgr.get_components_by_id<Sprite>(entity1.id).front().get();
-	ASSERT_NE(sprite.sprite_image.get(), nullptr);
+	ASSERT_NE(sprite.sprite_image.texture.get(), nullptr);
 
 	sprite.color = Color::GREEN;
 	EXPECT_EQ(sprite.color.r, Color::GREEN.r);
diff --git a/src/test/ResourceManagerTest.cpp b/src/test/ResourceManagerTest.cpp
index cc3b022..1f56e23 100644
--- a/src/test/ResourceManagerTest.cpp
+++ b/src/test/ResourceManagerTest.cpp
@@ -4,7 +4,7 @@
 #define protected public
 
 #include <crepe/util/Log.h>
-#include <crepe/ResourceManager.h>
+#include <crepe/manager/ResourceManager.h>
 #include <crepe/api/GameObject.h>
 
 using namespace std;
@@ -12,8 +12,9 @@ using namespace crepe;
 using namespace testing;
 
 class ResourceManagerTest : public Test {
+	Mediator mediator;
 public:
-	ResourceManager resource_manager{};
+	ResourceManager resource_manager{mediator};
 
 	Asset asset_a{"asset/texture/img.png"};
 	Asset asset_b{"asset/texture/ERROR.png"};
diff --git a/src/test/SceneManagerTest.cpp b/src/test/SceneManagerTest.cpp
index 62b7d33..d027d89 100644
--- a/src/test/SceneManagerTest.cpp
+++ b/src/test/SceneManagerTest.cpp
@@ -1,12 +1,13 @@
-#include "types.h"
-#include <crepe/ComponentManager.h>
+#include <gtest/gtest.h>
+
+#include <crepe/types.h>
+#include <crepe/manager/SceneManager.h>
+#include <crepe/manager/ComponentManager.h>
 #include <crepe/api/GameObject.h>
 #include <crepe/api/Metadata.h>
 #include <crepe/api/Scene.h>
-#include <crepe/api/SceneManager.h>
 #include <crepe/api/Transform.h>
 #include <crepe/api/Vector2.h>
-#include <gtest/gtest.h>
 
 using namespace std;
 using namespace crepe;
@@ -14,7 +15,8 @@ using namespace crepe;
 class ConcreteScene1 : public Scene {
 public:
 	void load_scene() {
-		ComponentManager & mgr = this->component_manager;
+		Mediator & mediator = this->mediator;
+		ComponentManager & mgr = mediator.component_manager;
 		GameObject object1 = mgr.new_object("scene_1", "tag_scene_1", vec2{0, 0}, 0, 1);
 		GameObject object2 = mgr.new_object("scene_1", "tag_scene_1", vec2{1, 0}, 0, 1);
 		GameObject object3 = mgr.new_object("scene_1", "tag_scene_1", vec2{2, 0}, 0, 1);
@@ -26,7 +28,8 @@ public:
 class ConcreteScene2 : public Scene {
 public:
 	void load_scene() {
-		ComponentManager & mgr = this->component_manager;
+		Mediator & mediator = this->mediator;
+		ComponentManager & mgr = mediator.component_manager;
 		GameObject object1 = mgr.new_object("scene_2", "tag_scene_2", vec2{0, 0}, 0, 1);
 		GameObject object2 = mgr.new_object("scene_2", "tag_scene_2", vec2{0, 1}, 0, 1);
 		GameObject object3 = mgr.new_object("scene_2", "tag_scene_2", vec2{0, 2}, 0, 1);
@@ -41,7 +44,8 @@ public:
 	ConcreteScene3(const string & name) : name(name) {}
 
 	void load_scene() {
-		ComponentManager & mgr = this->component_manager;
+		Mediator & mediator = this->mediator;
+		ComponentManager & mgr = mediator.component_manager;
 		GameObject object1 = mgr.new_object("scene_3", "tag_scene_3", vec2{0, 0}, 0, 1);
 	}
 
@@ -52,9 +56,10 @@ private:
 };
 
 class SceneManagerTest : public ::testing::Test {
+	Mediator m;
 public:
-	ComponentManager component_mgr{};
-	SceneManager scene_mgr{component_mgr};
+	ComponentManager component_mgr{m};
+	SceneManager scene_mgr{m};
 };
 
 TEST_F(SceneManagerTest, loadScene) {
diff --git a/src/test/ScriptEventTest.cpp b/src/test/ScriptEventTest.cpp
new file mode 100644
index 0000000..7a9abbb
--- /dev/null
+++ b/src/test/ScriptEventTest.cpp
@@ -0,0 +1,51 @@
+#include <gtest/gtest.h>
+
+// stupid hack to allow access to private/protected members under test
+#define private public
+#define protected public
+
+#include <crepe/manager/ComponentManager.h>
+#include <crepe/manager/EventManager.h>
+#include <crepe/api/BehaviorScript.h>
+#include <crepe/api/Event.h>
+#include <crepe/api/GameObject.h>
+#include <crepe/api/Script.h>
+#include <crepe/api/Vector2.h>
+#include <crepe/system/ScriptSystem.h>
+
+#include "ScriptTest.h"
+
+using namespace std;
+using namespace crepe;
+using namespace testing;
+
+class ScriptEventTest : public ScriptTest {
+public:
+	EventManager & event_manager = mediator.event_manager;
+
+	class MyEvent : public Event {};
+};
+
+TEST_F(ScriptEventTest, Inactive) {
+	BehaviorScript & behaviorscript = this->behaviorscript;
+	MyScript & script = this->script;
+	EventManager & evmgr = this->event_manager;
+
+	unsigned event_count = 0;
+	script.subscribe<MyEvent>([&](const MyEvent &){
+		event_count++;
+		return true;
+	});
+
+	system.update();
+	behaviorscript.active = false;
+	EXPECT_EQ(0, event_count);
+
+	evmgr.trigger_event<MyEvent>();
+	EXPECT_EQ(0, event_count);
+
+	behaviorscript.active = true;
+	evmgr.trigger_event<MyEvent>();
+	EXPECT_EQ(1, event_count);
+}
+
diff --git a/src/test/ScriptSceneTest.cpp b/src/test/ScriptSceneTest.cpp
new file mode 100644
index 0000000..f96ae8b
--- /dev/null
+++ b/src/test/ScriptSceneTest.cpp
@@ -0,0 +1,31 @@
+#include <gtest/gtest.h>
+
+// stupid hack to allow access to private/protected members under test
+#define private public
+#define protected public
+
+#include <crepe/manager/SceneManager.h>
+#include "ScriptTest.h"
+
+using namespace std;
+using namespace crepe;
+using namespace testing;
+
+class ScriptSceneTest : public ScriptTest {
+public:
+	SceneManager scene_manager{mediator};
+
+	class MyScene : public Scene {};
+};
+
+TEST_F(ScriptSceneTest, Inactive) {
+	BehaviorScript & behaviorscript = this->behaviorscript;
+	MyScript & script = this->script;
+
+	const char * non_default_value = "foo";
+	ASSERT_NE(non_default_value, scene_manager.next_scene);
+
+	script.set_next_scene(non_default_value);
+	EXPECT_EQ(non_default_value, scene_manager.next_scene);
+}
+
diff --git a/src/test/ScriptTest.cpp b/src/test/ScriptTest.cpp
index 78d5061..6d0d5fb 100644
--- a/src/test/ScriptTest.cpp
+++ b/src/test/ScriptTest.cpp
@@ -1,129 +1,78 @@
 #include <gtest/gtest.h>
+#include <gmock/gmock.h>
 
 // stupid hack to allow access to private/protected members under test
 #define private public
 #define protected public
 
-#include <crepe/ComponentManager.h>
-#include <crepe/api/BehaviorScript.h>
-#include <crepe/api/Event.h>
-#include <crepe/api/EventManager.h>
+#include "ScriptTest.h"
 #include <crepe/api/GameObject.h>
-#include <crepe/api/Script.h>
-#include <crepe/api/Vector2.h>
-#include <crepe/system/ScriptSystem.h>
 
 using namespace std;
 using namespace crepe;
 using namespace testing;
 
-class MyEvent : public Event {};
-
-class ScriptTest : public Test {
-public:
-	ComponentManager component_manager{};
-	ScriptSystem system{component_manager};
-	EventManager & event_manager = EventManager::get_instance();
-
-	class MyScript : public Script {
-		// NOTE: default (private) visibility of init and update shouldn't cause
-		// issues!
-		void init() {
-			this->init_count++;
-
-			subscribe<MyEvent>([this](const MyEvent &) {
-				this->event_count++;
-				return true;
-			});
-
-			// init should never be called more than once
-			EXPECT_LE(this->init_count, 1);
-		}
-		void update() { this->update_count++; }
-
-	public:
-		unsigned init_count = 0;
-		unsigned update_count = 0;
-		unsigned event_count = 0;
-	};
-
-	OptionalRef<BehaviorScript> behaviorscript;
-	OptionalRef<MyScript> script;
-
-	void SetUp() override {
-		auto & mgr = this->component_manager;
-		GameObject entity = mgr.new_object("name");
-		BehaviorScript & component = entity.add_component<BehaviorScript>();
-
-		this->behaviorscript = component;
-		ASSERT_TRUE(this->behaviorscript);
-		EXPECT_EQ(component.script.get(), nullptr);
-		component.set_script<MyScript>();
-		ASSERT_NE(component.script.get(), nullptr);
-
-		this->script = *(MyScript *) component.script.get();
-		ASSERT_TRUE(this->script);
-
-		// sanity
-		MyScript & script = this->script;
-		ASSERT_EQ(script.init_count, 0);
-		ASSERT_EQ(script.update_count, 0);
-		ASSERT_EQ(script.event_count, 0);
-	}
-};
+void ScriptTest::SetUp() {
+	auto & mgr = this->component_manager;
+	GameObject entity = mgr.new_object("name");
+	BehaviorScript & component = entity.add_component<BehaviorScript>();
+
+	this->behaviorscript = component;
+	ASSERT_TRUE(this->behaviorscript);
+	EXPECT_EQ(component.script.get(), nullptr);
+	component.set_script<NiceMock<MyScript>>();
+	ASSERT_NE(component.script.get(), nullptr);
+
+	this->script = *(MyScript *) component.script.get();
+	ASSERT_TRUE(this->script);
+}
 
 TEST_F(ScriptTest, Default) {
 	MyScript & script = this->script;
-	EXPECT_EQ(0, script.init_count);
-	EXPECT_EQ(0, script.update_count);
-	EXPECT_EQ(0, script.event_count);
+	EXPECT_CALL(script, init()).Times(0);
+	EXPECT_CALL(script, update()).Times(0);
 }
 
 TEST_F(ScriptTest, UpdateOnce) {
 	MyScript & script = this->script;
 
-	system.update();
-	EXPECT_EQ(1, script.init_count);
-	EXPECT_EQ(1, script.update_count);
-	EXPECT_EQ(0, script.event_count);
+	{
+		InSequence seq;
+
+		EXPECT_CALL(script, init()).Times(1);
+		EXPECT_CALL(script, update()).Times(1);
+		system.update();
+	}
+
+	{
+		InSequence seq;
+
+		EXPECT_CALL(script, init()).Times(0);
+		EXPECT_CALL(script, update()).Times(1);
+		system.update();
+	}
 }
 
 TEST_F(ScriptTest, UpdateInactive) {
 	BehaviorScript & behaviorscript = this->behaviorscript;
 	MyScript & script = this->script;
 
-	behaviorscript.active = false;
-	system.update();
-	EXPECT_EQ(0, script.init_count);
-	EXPECT_EQ(0, script.update_count);
-	EXPECT_EQ(0, script.event_count);
-
-	behaviorscript.active = true;
-	system.update();
-	EXPECT_EQ(1, script.init_count);
-	EXPECT_EQ(1, script.update_count);
-	EXPECT_EQ(0, script.event_count);
-}
+	{
+		InSequence seq;
 
-TEST_F(ScriptTest, EventInactive) {
-	BehaviorScript & behaviorscript = this->behaviorscript;
-	MyScript & script = this->script;
-	EventManager & evmgr = this->event_manager;
-
-	system.update();
-	behaviorscript.active = false;
-	EXPECT_EQ(1, script.init_count);
-	EXPECT_EQ(1, script.update_count);
-	EXPECT_EQ(0, script.event_count);
-
-	evmgr.trigger_event<MyEvent>();
-	EXPECT_EQ(1, script.init_count);
-	EXPECT_EQ(1, script.update_count);
-	EXPECT_EQ(0, script.event_count);
-
-	behaviorscript.active = true;
-	evmgr.trigger_event<MyEvent>();
-	EXPECT_EQ(1, script.init_count);
-	EXPECT_EQ(1, script.update_count);
-	EXPECT_EQ(1, script.event_count);
+		EXPECT_CALL(script, init()).Times(0);
+		EXPECT_CALL(script, update()).Times(0);
+		behaviorscript.active = false;
+		system.update();
+	}
+
+	{
+		InSequence seq;
+
+		EXPECT_CALL(script, init()).Times(1);
+		EXPECT_CALL(script, update()).Times(1);
+		behaviorscript.active = true;
+		system.update();
+	}
 }
+
diff --git a/src/test/ScriptTest.h b/src/test/ScriptTest.h
new file mode 100644
index 0000000..9a71ba7
--- /dev/null
+++ b/src/test/ScriptTest.h
@@ -0,0 +1,29 @@
+#pragma once
+
+#include <gtest/gtest.h>
+#include <gmock/gmock.h>
+
+#include <crepe/manager/ComponentManager.h>
+#include <crepe/system/ScriptSystem.h>
+#include <crepe/api/BehaviorScript.h>
+#include <crepe/api/Script.h>
+
+class ScriptTest : public testing::Test {
+protected:
+	crepe::Mediator mediator;
+public:
+	crepe::ComponentManager component_manager{mediator};
+	crepe::ScriptSystem system{mediator};
+
+	class MyScript : public crepe::Script {
+		// NOTE: explicitly stating `public:` is not required on actual scripts
+	public:
+		MOCK_METHOD(void, init, (), (override));
+		MOCK_METHOD(void, update, (), (override));
+	};
+
+	crepe::OptionalRef<crepe::BehaviorScript> behaviorscript;
+	crepe::OptionalRef<MyScript> script;
+
+	virtual void SetUp();
+};