Merge branch 'master' of https://github.com/lonkaars/crepe into wouter/inputSystem

95 files changed, 2887 insertions, 1360 deletions

diff --git a/src/crepe/CMakeLists.txt b/src/crepe/CMakeLists.txt
index da9d492..6cbb9fe 100644
--- a/src/crepe/CMakeLists.txt
+++ b/src/crepe/CMakeLists.txt
@@ -2,6 +2,7 @@ target_sources(crepe PUBLIC
 	Particle.cpp
 	Component.cpp
 	Collider.cpp
+	Resource.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -9,6 +10,7 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Collider.h
 	ValueBroker.h
 	ValueBroker.hpp
+	Resource.h
 )
 
 add_subdirectory(api)
diff --git a/src/crepe/Component.h b/src/crepe/Component.h
index c30419d..eff5a58 100644
--- a/src/crepe/Component.h
+++ b/src/crepe/Component.h
@@ -16,7 +16,12 @@ class Component {
 public:
 	//! Whether the component is active
 	bool active = true;
-	//! The id of the GameObject this component belongs to
+	/**
+	 * \brief The id of the GameObject this component belongs to
+	 *
+	 * \note Only systems are supposed to use this member, but since friend
+	 * relations aren't inherited this needs to be public.
+	 */
 	const game_object_id_t game_object_id;
 
 protected:
@@ -24,7 +29,7 @@ protected:
 	 * \param id The id of the GameObject this component belongs to
 	 */
 	Component(game_object_id_t id);
-	//! Only the ComponentManager can create components
+	//! Only ComponentManager can create components
 	friend class ComponentManager;
 
 	Component(const Component &) = delete;
diff --git a/src/crepe/Resource.cpp b/src/crepe/Resource.cpp
new file mode 100644
index 0000000..85913ed
--- /dev/null
+++ b/src/crepe/Resource.cpp
@@ -0,0 +1,6 @@
+#include "Resource.h"
+#include "manager/Mediator.h"
+
+using namespace crepe;
+
+Resource::Resource(const Asset & asset, Mediator & mediator) {}
diff --git a/src/crepe/Resource.h b/src/crepe/Resource.h
new file mode 100644
index 0000000..d65206b
--- /dev/null
+++ b/src/crepe/Resource.h
@@ -0,0 +1,30 @@
+#pragma once
+
+namespace crepe {
+
+class ResourceManager;
+class Asset;
+class Mediator;
+
+/**
+ * \brief Resource interface
+ *
+ * Resource is an interface class used to represent a (deserialized) game resource (e.g.
+ * textures, sounds). Resources are always created from \ref Asset "assets" by ResourceManager.
+ *
+ * The game programmer has the ability to use the ResourceManager to keep instances of concrete
+ * resources between scenes, preventing them from being reinstantiated during a scene
+ * transition.
+ */
+class Resource {
+public:
+	Resource(const Asset & src, Mediator & mediator);
+	virtual ~Resource() = default;
+
+	Resource(const Resource &) = delete;
+	Resource(Resource &&) = delete;
+	Resource & operator=(const Resource &) = delete;
+	Resource & operator=(Resource &&) = delete;
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/AI.cpp b/src/crepe/api/AI.cpp
new file mode 100644
index 0000000..2195249
--- /dev/null
+++ b/src/crepe/api/AI.cpp
@@ -0,0 +1,89 @@
+#include <stdexcept>
+#include <type_traits>
+
+#include "AI.h"
+#include "types.h"
+
+namespace crepe {
+
+AI::AI(game_object_id_t id, float max_force) : Component(id), max_force(max_force) {}
+
+void AI::make_circle_path(float radius, const vec2 & center, float start_angle,
+						  bool clockwise) {
+	if (radius <= 0) {
+		throw std::runtime_error("Radius must be greater than 0");
+	}
+
+	// The step size is determined by the radius (step size is in radians)
+	float step = RADIUS_TO_STEP / radius;
+	// Force at least MIN_STEP steps (in case of a small radius)
+	if (step > 2 * M_PI / MIN_STEP) {
+		step = 2 * M_PI / MIN_STEP;
+	}
+	// The path node distance is determined by the step size and the radius
+	this->path_node_distance = radius * step * PATH_NODE_DISTANCE_FACTOR;
+
+	if (clockwise) {
+		for (float i = start_angle; i < 2 * M_PI + start_angle; i += step) {
+			path.push_back(vec2{static_cast<float>(center.x + radius * cos(i)),
+								static_cast<float>(center.y + radius * sin(i))});
+		}
+	} else {
+		for (float i = start_angle; i > start_angle - 2 * M_PI; i -= step) {
+			path.push_back(vec2{static_cast<float>(center.x + radius * cos(i)),
+								static_cast<float>(center.y + radius * sin(i))});
+		}
+	}
+}
+
+void AI::make_oval_path(float radius_x, float radius_y, const vec2 & center, float start_angle,
+						bool clockwise, float rotation) {
+	if (radius_x <= 0 && radius_y <= 0) {
+		throw std::runtime_error("Radius must be greater than 0");
+	}
+
+	float max_radius = std::max(radius_x, radius_y);
+	// The step size is determined by the radius (step size is in radians)
+	float step = RADIUS_TO_STEP / max_radius;
+	// Force at least MIN_STEP steps (in case of a small radius)
+	if (step > 2 * M_PI / MIN_STEP) {
+		step = 2 * M_PI / MIN_STEP;
+	}
+	// The path node distance is determined by the step size and the radius
+	this->path_node_distance = max_radius * step * PATH_NODE_DISTANCE_FACTOR;
+
+	std::function<vec2(vec2, vec2)> rotate_point = [rotation](vec2 point, vec2 center) {
+		float s = sin(rotation);
+		float c = cos(rotation);
+
+		// Translate point back to origin
+		point.x -= center.x;
+		point.y -= center.y;
+
+		// Rotate point
+		float xnew = point.x * c - point.y * s;
+		float ynew = point.x * s + point.y * c;
+
+		// Translate point back
+		point.x = xnew + center.x;
+		point.y = ynew + center.y;
+
+		return point;
+	};
+
+	if (clockwise) {
+		for (float i = start_angle; i < 2 * M_PI + start_angle; i += step) {
+			vec2 point = {static_cast<float>(center.x + radius_x * cos(i)),
+						  static_cast<float>(center.y + radius_y * sin(i))};
+			path.push_back(rotate_point(point, center));
+		}
+	} else {
+		for (float i = start_angle; i > start_angle - 2 * M_PI; i -= step) {
+			vec2 point = {static_cast<float>(center.x + radius_x * cos(i)),
+						  static_cast<float>(center.y + radius_y * sin(i))};
+			path.push_back(rotate_point(point, center));
+		}
+	}
+}
+
+} // namespace crepe
diff --git a/src/crepe/api/AI.h b/src/crepe/api/AI.h
new file mode 100644
index 0000000..c780a91
--- /dev/null
+++ b/src/crepe/api/AI.h
@@ -0,0 +1,128 @@
+#pragma once
+
+#include "Component.h"
+#include "types.h"
+
+namespace crepe {
+
+/**
+ * \brief The AI component is used to control the movement of an entity using AI.
+ *
+ * The AI component can be used to control the movement of an entity. The AI component can be used
+ * to implement different behaviors such as seeking, fleeing, arriving, and path following.
+ */
+class AI : public Component {
+public:
+	//! The different types of behaviors that can be used
+	enum BehaviorTypeMask {
+		SEEK = 0x00002,
+		FLEE = 0x00004,
+		ARRIVE = 0x00008,
+		PATH_FOLLOW = 0x00010,
+	};
+
+public:
+	/**
+	 * \param id The id of the game object
+	 * \param max_force The maximum force that can be applied to the entity
+	 */
+	AI(game_object_id_t id, float max_force);
+
+	/**
+	 * \brief Check if a behavior is on (aka activated)
+	 *
+	 * \param behavior The behavior to check
+	 * \return true if the behavior is on, false otherwise
+	 */
+	bool on(BehaviorTypeMask behavior) const { return (flags & behavior); }
+	//! Turn on the seek behavior
+	void seek_on() { flags |= SEEK; }
+	//! Turn off the seek behavior
+	void seek_off() { flags &= ~SEEK; }
+	//! Turn on the flee behavior
+	void flee_on() { flags |= FLEE; }
+	//! Turn off the flee behavior
+	void flee_off() { flags &= ~FLEE; }
+	//! Turn on the arrive behavior
+	void arrive_on() { flags |= ARRIVE; }
+	//! Turn off the arrive behavior
+	void arrive_off() { flags &= ~ARRIVE; }
+	//! Turn on the path follow behavior
+	void path_follow_on() { flags |= PATH_FOLLOW; }
+	//! Turn off the path follow behavior
+	void path_follow_off() { flags &= ~PATH_FOLLOW; }
+
+	/**
+	 * \brief Add a path node (for the path following behavior)
+	 *
+	 * \note The path is not relative to the entity's position (it is an absolute path)
+	 *
+	 * \param node The path node to add
+	 */
+	void add_path_node(const vec2 & node) { path.push_back(node); }
+	/**
+	 * \brief Make a circle path (for the path following behavior)
+	 *
+	 * \note The path is not relative to the entity's position (it is an absolute path)
+	 *
+	 * \param radius The radius of the circle (in game units)
+	 * \param center The center of the circle (in game units)
+	 * \param start_angle The start angle of the circle (in radians)
+	 * \param clockwise The direction of the circle
+	 */
+	void make_circle_path(float radius, const vec2 & center = {0, 0}, float start_angle = 0,
+						  bool clockwise = true);
+	/**
+	 * \brief Make an oval path (for the path following behavior)
+	 *
+	 * \note The path is not relative to the entity's position (it is an absolute path)
+	 *
+	 * \param radius_x The x radius of the oval (in game units)
+	 * \param radius_y The y radius of the oval (in game units)
+	 * \param center The center of the oval (in game units)
+	 * \param start_angle The start angle of the oval (in radians)
+	 * \param clockwise The direction of the oval
+	 * \param rotation The rotation of the oval (in radians)
+	 */
+	void make_oval_path(float radius_x, float radius_y, const vec2 & center = {0, 0},
+						float start_angle = 0, bool clockwise = true, float rotation = 0);
+
+public:
+	//! The maximum force that can be applied to the entity (higher values will make the entity adjust faster)
+	float max_force;
+
+	//! The target to seek at
+	vec2 seek_target;
+	//! The target to arrive at
+	vec2 arrive_target;
+	//! The target to flee from
+	vec2 flee_target;
+	//! The distance at which the entity will start to flee from the target
+	float square_flee_panic_distance = 200.0f * 200.0f;
+	//! The deceleration rate for the arrive behavior (higher values will make the entity decelerate faster (less overshoot))
+	float arrive_deceleration = 40.0f;
+	//! The path to follow (for the path following behavior)
+	std::vector<vec2> path;
+	//! The distance from the path node at which the entity will move to the next node (automatically set by make_circle_path())
+	float path_node_distance = 400.0f;
+	//! Looping behavior for the path
+	bool path_loop = true;
+
+private:
+	//! The flags for the behaviors
+	int flags = 0;
+	//! The current path index
+	size_t path_index = 0;
+
+	//! The AISystem is the only class that should access the flags and path_index variables
+	friend class AISystem;
+
+	//! The minimum amount of steps for the path following behavior
+	static constexpr int MIN_STEP = 16;
+	//! The radius to step size ratio for the path following behavior
+	static constexpr float RADIUS_TO_STEP = 400.0f;
+	//! The path node distance factor for the path following behavior
+	static constexpr float PATH_NODE_DISTANCE_FACTOR = 0.75f;
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/Animator.cpp b/src/crepe/api/Animator.cpp
index b8a91dc..4ce4bf0 100644
--- a/src/crepe/api/Animator.cpp
+++ b/src/crepe/api/Animator.cpp
@@ -7,23 +7,21 @@
 
 using namespace crepe;
 
-Animator::Animator(game_object_id_t id, Sprite & spritesheet, unsigned int max_row,
-				   unsigned int max_col, const Animator::Data & data)
+Animator::Animator(game_object_id_t id, Sprite & spritesheet, const ivec2 & single_frame_size,
+				   const uvec2 & grid_size, const Animator::Data & data)
 	: Component(id),
 	  spritesheet(spritesheet),
-	  max_rows(max_row),
-	  max_columns(max_col),
+	  grid_size(grid_size),
 	  data(data) {
 	dbg_trace();
 
-	this->spritesheet.mask.h /= this->max_columns;
-	this->spritesheet.mask.w /= this->max_rows;
-	this->spritesheet.mask.x = this->data.row * this->spritesheet.mask.w;
-	this->spritesheet.mask.y = this->data.col * this->spritesheet.mask.h;
+	this->spritesheet.mask.w = single_frame_size.x;
+	this->spritesheet.mask.h = single_frame_size.y;
+	this->spritesheet.mask.x = 0;
+	this->spritesheet.mask.y = 0;
 
-	// 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;
+		= static_cast<float>(single_frame_size.x) / single_frame_size.y;
 }
 
 Animator::~Animator() { dbg_trace(); }
@@ -54,6 +52,6 @@ void Animator::set_anim(int col) {
 
 void Animator::next_anim() {
 	Animator::Data & ctx = this->data;
-	ctx.row = ctx.row++ % this->max_rows;
+	ctx.row = ctx.row++ % this->grid_size.x;
 	this->spritesheet.mask.x = ctx.row * this->spritesheet.mask.w;
 }
diff --git a/src/crepe/api/Animator.h b/src/crepe/api/Animator.h
index 7c850b8..5918800 100644
--- a/src/crepe/api/Animator.h
+++ b/src/crepe/api/Animator.h
@@ -75,27 +75,28 @@ public:
 	 *
 	 * \param id The unique identifier for the component, typically assigned automatically.
 	 * \param spritesheet the reference to the spritesheet
-	 * \param max_row maximum of rows inside the given spritesheet
-	 * \param max_col maximum of columns inside the given spritesheet
+	 * \param single_frame_size the width and height in pixels of a single frame inside the
+	 * spritesheet
+	 * \param grid_size the max rows and columns inside the given spritesheet
 	 * \param data extra animation data for more control
 	 *
 	 * This constructor sets up the Animator with the given parameters, and initializes the
 	 * animation system.
 	 */
-	Animator(game_object_id_t id, Sprite & spritesheet, unsigned int max_row,
-			 unsigned int max_col, const Animator::Data & data);
+	Animator(game_object_id_t id, Sprite & spritesheet, const ivec2 & single_frame_size,
+			 const uvec2 & grid_size, const Animator::Data & data);
 	~Animator(); // dbg_trace
 
 public:
-	//! The maximum number of columns in the sprite sheet.
-	const unsigned int max_columns;
-	//! The maximum number of rows in the sprite sheet.
-	const unsigned int max_rows;
 	Animator::Data data;
 
 private:
 	//! A reference to the Sprite sheet containing.
 	Sprite & spritesheet;
+
+	//! The maximum number of rows and columns inside the spritesheet
+	const uvec2 grid_size;
+
 	//! Uses the spritesheet
 	friend AnimatorSystem;
 };
diff --git a/src/crepe/api/AssetManager.cpp b/src/crepe/api/AssetManager.cpp
deleted file mode 100644
index 3925758..0000000
--- a/src/crepe/api/AssetManager.cpp
+++ /dev/null
@@ -1,17 +0,0 @@
-#include "util/Log.h"
-
-#include "AssetManager.h"
-
-using namespace crepe;
-
-AssetManager & AssetManager::get_instance() {
-	static AssetManager instance;
-	return instance;
-}
-
-AssetManager::~AssetManager() {
-	dbg_trace();
-	this->asset_cache.clear();
-}
-
-AssetManager::AssetManager() { dbg_trace(); }
diff --git a/src/crepe/api/AssetManager.h b/src/crepe/api/AssetManager.h
deleted file mode 100644
index 3b1cc4b..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/AudioSource.cpp b/src/crepe/api/AudioSource.cpp
new file mode 100644
index 0000000..7b05cb1
--- /dev/null
+++ b/src/crepe/api/AudioSource.cpp
@@ -0,0 +1,15 @@
+#include "AudioSource.h"
+
+using namespace crepe;
+using namespace std;
+
+AudioSource::AudioSource(game_object_id_t id, const Asset & src)
+	: Component(id),
+	  source(src) {}
+
+void AudioSource::play(bool looping) {
+	this->loop = looping;
+	this->oneshot_play = true;
+}
+
+void AudioSource::stop() { this->oneshot_stop = true; }
diff --git a/src/crepe/api/AudioSource.h b/src/crepe/api/AudioSource.h
new file mode 100644
index 0000000..b20e490
--- /dev/null
+++ b/src/crepe/api/AudioSource.h
@@ -0,0 +1,74 @@
+#pragma once
+
+#include "../Component.h"
+#include "../facade/SoundHandle.h"
+#include "../types.h"
+
+#include "Asset.h"
+#include "GameObject.h"
+
+namespace crepe {
+
+class AudioSystem;
+
+//! Audio source component
+class AudioSource : public Component {
+	//! AudioSource components are handled by AudioSystem
+	friend class AudioSystem;
+
+protected:
+	/**
+	 * \param source Sound sample to load
+	 */
+	AudioSource(game_object_id_t id, const Asset & source);
+	//! Only ComponentManager creates components
+	friend class ComponentManager;
+
+public:
+	// std::unique_ptr needs to be able to destoy this component
+	virtual ~AudioSource() = default;
+
+public:
+	//! Start this audio source
+	void play(bool looping = false);
+	//! Stop this audio source
+	void stop();
+
+public:
+	//! Play when this component becomes active
+	bool play_on_awake = false;
+	//! Repeat the current audio clip during playback
+	bool loop = false;
+	//! Normalized volume (0.0 - 1.0)
+	float volume = 1.0;
+
+private:
+	//! This audio source's clip
+	const Asset source;
+
+	/**
+	 * \name One-shot state variables
+	 *
+	 * These variables trigger function calls when set to true, and are unconditionally reset on
+	 * every system update.
+	 *
+	 * \{
+	 */
+	//! Play this sample
+	bool oneshot_play = false;
+	//! Stop this sample
+	bool oneshot_stop = false;
+	//! \}
+	/**
+	 * \name State diffing variables
+	 * \{
+	 */
+	typeof(active) last_active = false;
+	typeof(volume) last_volume = volume;
+	typeof(loop) last_loop = loop;
+	//! \}
+	//! This source's voice handle
+	SoundHandle voice{};
+};
+
+} // namespace crepe
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index 593c4e6..fb11c8d 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -1,13 +1,11 @@
 target_sources(crepe PUBLIC
-	# AudioSource.cpp
+	AudioSource.cpp
 	BehaviorScript.cpp
 	GameObject.cpp
 	Rigidbody.cpp
 	ParticleEmitter.cpp
 	Transform.cpp
 	Color.cpp
-	Texture.cpp
-	AssetManager.cpp
 	Sprite.cpp
 	Config.cpp
 	Metadata.cpp
@@ -15,19 +13,17 @@ target_sources(crepe PUBLIC
 	Animator.cpp
 	BoxCollider.cpp
 	CircleCollider.cpp
-	IKeyListener.cpp
-	IMouseListener.cpp
 	LoopManager.cpp
-	LoopTimer.cpp
 	Asset.cpp
 	EventHandler.cpp
 	Script.cpp
 	Button.cpp
 	UIObject.cpp
+	AI.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
-	# AudioSource.h
+	AudioSource.h
 	BehaviorScript.h
 	Config.h
 	Script.h
@@ -39,9 +35,6 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Vector2.h
 	Vector2.hpp
 	Color.h
-	Texture.h
-	AssetManager.h
-	AssetManager.hpp
 	Scene.h
 	Metadata.h
 	Camera.h
@@ -51,11 +44,9 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	EventHandler.h
 	EventHandler.hpp
 	Event.h
-	IKeyListener.h
-	IMouseListener.h
 	LoopManager.h
-	LoopTimer.h
 	Asset.h
 	Button.h
 	UIObject.h
+	AI.h
 )
diff --git a/src/crepe/api/Config.h b/src/crepe/api/Config.h
index 324e639..925ded8 100644
--- a/src/crepe/api/Config.h
+++ b/src/crepe/api/Config.h
@@ -15,20 +15,10 @@ namespace crepe {
  * modified *before* execution is handed over from the game programmer to the engine (i.e. the
  * main loop is started).
  */
-class Config final {
-public:
+struct Config final {
 	//! Retrieve handle to global Config instance
 	static Config & get_instance();
 
-private:
-	Config() = default;
-	~Config() = default;
-	Config(const Config &) = default;
-	Config(Config &&) = default;
-	Config & operator=(const Config &) = default;
-	Config & operator=(Config &&) = default;
-
-public:
 	//! Logging-related settings
 	struct {
 		/**
@@ -91,6 +81,12 @@ public:
 		//! The maximum number of pixels the mouse can move between MouseDown and MouseUp events to be considered a click.
 		int click_tolerance = 5;
 	} input;
+
+	//! Audio system settings
+	struct {
+		//! Max amount of simultanious voices
+		unsigned int voices = 32;
+	} audio;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/IKeyListener.cpp b/src/crepe/api/IKeyListener.cpp
deleted file mode 100644
index 8642655..0000000
--- a/src/crepe/api/IKeyListener.cpp
+++ /dev/null
@@ -1,19 +0,0 @@
-#include "IKeyListener.h"
-
-using namespace crepe;
-
-// Constructor with specified channel
-IKeyListener::IKeyListener(event_channel_t channel)
-	: event_manager(EventManager::get_instance()) {
-	this->press_id = event_manager.subscribe<KeyPressEvent>(
-		[this](const KeyPressEvent & event) { return this->on_key_pressed(event); }, channel);
-	this->release_id = event_manager.subscribe<KeyReleaseEvent>(
-		[this](const KeyReleaseEvent & event) { return this->on_key_released(event); },
-		channel);
-}
-
-// Destructor, unsubscribe events
-IKeyListener::~IKeyListener() {
-	event_manager.unsubscribe(this->press_id);
-	event_manager.unsubscribe(this->release_id);
-}
diff --git a/src/crepe/api/IKeyListener.h b/src/crepe/api/IKeyListener.h
deleted file mode 100644
index 180a0a6..0000000
--- a/src/crepe/api/IKeyListener.h
+++ /dev/null
@@ -1,50 +0,0 @@
-#pragma once
-
-#include "../manager/EventManager.h"
-
-#include "Event.h"
-#include "EventHandler.h"
-
-namespace crepe {
-
-/**
- * \class IKeyListener
- * \brief Interface for keyboard event handling in the application.
- */
-class IKeyListener {
-public:
-	/**
-	 * \brief Constructs an IKeyListener with a specified channel.
-	 * \param channel The channel ID for event handling.
-	 */
-	IKeyListener(event_channel_t channel = EventManager::CHANNEL_ALL);
-	virtual ~IKeyListener();
-	IKeyListener(const IKeyListener &) = delete;
-	IKeyListener & operator=(const IKeyListener &) = delete;
-	IKeyListener & operator=(IKeyListener &&) = delete;
-	IKeyListener(IKeyListener &&) = delete;
-
-	/**
-	 * \brief Pure virtual function to handle key press events.
-	 * \param event The key press event to handle.
-	 * \return True if the event was handled, false otherwise.
-	 */
-	virtual bool on_key_pressed(const KeyPressEvent & event) = 0;
-
-	/**
-	 * \brief Pure virtual function to handle key release events.
-	 * \param event The key release event to handle.
-	 * \return True if the event was handled, false otherwise.
-	 */
-	virtual bool on_key_released(const KeyReleaseEvent & event) = 0;
-
-private:
-	//! Key press event id
-	subscription_t press_id = -1;
-	//! Key release event id
-	subscription_t release_id = -1;
-	//! EventManager reference
-	EventManager & event_manager;
-};
-
-} // namespace crepe
diff --git a/src/crepe/api/IMouseListener.cpp b/src/crepe/api/IMouseListener.cpp
deleted file mode 100644
index 989aeb3..0000000
--- a/src/crepe/api/IMouseListener.cpp
+++ /dev/null
@@ -1,29 +0,0 @@
-#include "IMouseListener.h"
-
-using namespace crepe;
-
-IMouseListener::IMouseListener(event_channel_t channel)
-	: event_manager(EventManager::get_instance()) {
-	this->click_id = event_manager.subscribe<MouseClickEvent>(
-		[this](const MouseClickEvent & event) { return this->on_mouse_clicked(event); },
-		channel);
-
-	this->press_id = event_manager.subscribe<MousePressEvent>(
-		[this](const MousePressEvent & event) { return this->on_mouse_pressed(event); },
-		channel);
-
-	this->release_id = event_manager.subscribe<MouseReleaseEvent>(
-		[this](const MouseReleaseEvent & event) { return this->on_mouse_released(event); },
-		channel);
-
-	this->move_id = event_manager.subscribe<MouseMoveEvent>(
-		[this](const MouseMoveEvent & event) { return this->on_mouse_moved(event); }, channel);
-}
-
-IMouseListener::~IMouseListener() {
-	// Unsubscribe event handlers
-	event_manager.unsubscribe(this->click_id);
-	event_manager.unsubscribe(this->press_id);
-	event_manager.unsubscribe(this->release_id);
-	event_manager.unsubscribe(this->move_id);
-}
diff --git a/src/crepe/api/IMouseListener.h b/src/crepe/api/IMouseListener.h
deleted file mode 100644
index e19897d..0000000
--- a/src/crepe/api/IMouseListener.h
+++ /dev/null
@@ -1,73 +0,0 @@
-#pragma once
-
-#include "../manager/EventManager.h"
-
-#include "Event.h"
-#include "EventHandler.h"
-
-namespace crepe {
-
-/**
- * \class IMouseListener
- * \brief Interface for mouse event handling in the application.
- */
-class IMouseListener {
-public:
-	/**
-	 * \brief Constructs an IMouseListener with a specified channel.
-	 * \param channel The channel ID for event handling.
-	 */
-	IMouseListener(event_channel_t channel = EventManager::CHANNEL_ALL);
-	virtual ~IMouseListener();
-	IMouseListener & operator=(const IMouseListener &) = delete;
-	IMouseListener(const IMouseListener &) = delete;
-	IMouseListener & operator=(const IMouseListener &&) = delete;
-	IMouseListener(IMouseListener &&) = delete;
-
-	/**
-	 * \brief Move assignment operator (deleted).
-	 */
-	IMouseListener & operator=(IMouseListener &&) = delete;
-
-	/**
-	 * \brief Handles a mouse click event.
-	 * \param event The mouse click event to handle.
-	 * \return True if the event was handled, false otherwise.
-	 */
-	virtual bool on_mouse_clicked(const MouseClickEvent & event) = 0;
-
-	/**
-	 * \brief Handles a mouse press event.
-	 * \param event The mouse press event to handle.
-	 * \return True if the event was handled, false otherwise.
-	 */
-	virtual bool on_mouse_pressed(const MousePressEvent & event) = 0;
-
-	/**
-	 * \brief Handles a mouse release event.
-	 * \param event The mouse release event to handle.
-	 * \return True if the event was handled, false otherwise.
-	 */
-	virtual bool on_mouse_released(const MouseReleaseEvent & event) = 0;
-
-	/**
-	 * \brief Handles a mouse move event.
-	 * \param event The mouse move event to handle.
-	 * \return True if the event was handled, false otherwise.
-	 */
-	virtual bool on_mouse_moved(const MouseMoveEvent & event) = 0;
-
-private:
-	//! Mouse click event id
-	subscription_t click_id = -1;
-	//! Mouse press event id
-	subscription_t press_id = -1;
-	//! Mouse release event id
-	subscription_t release_id = -1;
-	//! Mouse move event id
-	subscription_t move_id = -1;
-	//! EventManager reference
-	EventManager & event_manager;
-};
-
-} //namespace crepe
diff --git a/src/crepe/api/LoopManager.cpp b/src/crepe/api/LoopManager.cpp
index 88243c4..b5e5ff7 100644
--- a/src/crepe/api/LoopManager.cpp
+++ b/src/crepe/api/LoopManager.cpp
@@ -1,11 +1,16 @@
+#include "../facade/SDLContext.h"
+#include "../manager/EventManager.h"
+#include "../manager/LoopTimerManager.h"
+#include "../system/AISystem.h"
 #include "../system/AnimatorSystem.h"
+#include "../system/AudioSystem.h"
 #include "../system/CollisionSystem.h"
 #include "../system/InputSystem.h"
 #include "../system/ParticleSystem.h"
 #include "../system/PhysicsSystem.h"
 #include "../system/RenderSystem.h"
 #include "../system/ScriptSystem.h"
-#include "manager/EventManager.h"
+#include "../util/Log.h"
 
 #include "LoopManager.h"
 
@@ -20,58 +25,62 @@ LoopManager::LoopManager() {
 	this->load_system<RenderSystem>();
 	this->load_system<ScriptSystem>();
 	this->load_system<InputSystem>();
+	this->event_manager.subscribe<ShutDownEvent>(
+		[this](const ShutDownEvent & event) { return this->on_shutdown(event); });
+	this->load_system<AudioSystem>();
+	this->load_system<AISystem>();
 }
-
-void LoopManager::process_input() { this->get_system<InputSystem>().update(); }
-
 void LoopManager::start() {
 	this->setup();
 	this->loop();
 }
-void LoopManager::set_running(bool running) { this->game_running = running; }
 
-void LoopManager::fixed_update() {
-	// TODO: retrieve EventManager from direct member after singleton refactor
-	EventManager & ev = this->mediator.event_manager;
-	ev.dispatch_events();
-	this->get_system<ScriptSystem>().update();
-	this->get_system<PhysicsSystem>().update();
-	this->get_system<CollisionSystem>().update();
+void LoopManager::setup() {
+	this->game_running = true;
+	this->loop_timer.start();
+	this->scene_manager.load_next_scene();
 }
 
 void LoopManager::loop() {
-	LoopTimer & timer = this->loop_timer;
-	timer.start();
+	try {
+		while (game_running) {
+			this->loop_timer.update();
 
-	while (game_running) {
-		timer.update();
+			while (this->loop_timer.get_lag() >= this->loop_timer.get_fixed_delta_time()) {
+				this->fixed_update();
+				this->loop_timer.advance_fixed_elapsed_time();
+			}
 
-		while (timer.get_lag() >= timer.get_fixed_delta_time()) {
-			this->process_input();
-			this->fixed_update();
-			timer.advance_fixed_update();
+			this->frame_update();
+			this->loop_timer.enforce_frame_rate();
 		}
-
-		this->update();
-		this->render();
-
-		timer.enforce_frame_rate();
+	} catch (const exception & e) {
+		Log::logf(Log::Level::ERROR, "Exception caught in main loop: {}", e.what());
+		this->event_manager.trigger_event<ShutDownEvent>(ShutDownEvent{});
 	}
 }
 
-void LoopManager::setup() {
-	LoopTimer & timer = this->loop_timer;
-	this->game_running = true;
-	this->scene_manager.load_next_scene();
-	timer.start();
-	timer.set_fps(200);
+// will be called at a fixed interval
+void LoopManager::fixed_update() {
+	this->get_system<InputSystem>().update();
+	this->event_manager.dispatch_events();
+	this->get_system<ScriptSystem>().update();
+	this->get_system<AISystem>().update();
+	this->get_system<PhysicsSystem>().update();
+	this->get_system<CollisionSystem>().update();
+	this->get_system<AudioSystem>().update();
 }
 
-void LoopManager::render() {
-	if (!this->game_running) return;
-
+// will be called every frame
+void LoopManager::frame_update() {
+	this->scene_manager.load_next_scene();
 	this->get_system<AnimatorSystem>().update();
+	//render
 	this->get_system<RenderSystem>().update();
 }
 
-void LoopManager::update() {}
+bool LoopManager::on_shutdown(const ShutDownEvent & e) {
+	this->game_running = false;
+	// propagate to possible user ShutDownEvent listeners
+	return false;
+}
diff --git a/src/crepe/api/LoopManager.h b/src/crepe/api/LoopManager.h
index d8910a0..2915315 100644
--- a/src/crepe/api/LoopManager.h
+++ b/src/crepe/api/LoopManager.h
@@ -4,13 +4,16 @@
 
 #include "../facade/SDLContext.h"
 #include "../manager/ComponentManager.h"
+#include "../manager/EventManager.h"
+#include "../manager/LoopTimerManager.h"
+#include "../manager/Mediator.h"
+#include "../manager/ResourceManager.h"
+#include "../manager/SaveManager.h"
 #include "../manager/SceneManager.h"
 #include "../system/System.h"
 
-#include "LoopTimer.h"
 
 namespace crepe {
-
 /**
  * \brief Main game loop manager
  *
@@ -18,8 +21,14 @@ namespace crepe {
  */
 class LoopManager {
 public:
-	void start();
 	LoopManager();
+	/**
+	 * \brief Start the gameloop
+	 *
+	 * This is the start of the engine where the setup is called and then the loop keeps running until the game stops running.
+	 * The Game programmer needs to call this function to run the game. This should be done after creating and adding all scenes.
+	 */
+	void start();
 
 	/**
 	 * \brief Add a new concrete scene to the scene manager
@@ -44,47 +53,20 @@ private:
 	void loop();
 
 	/**
-	 * \brief Function for handling input-related system calls.
-	 *
-	 * Processes user inputs from keyboard and mouse.
-	 */
-	void process_input();
-
-	/**
 	 * \brief Per-frame update.
 	 *
 	 * Updates the game state based on the elapsed time since the last frame.
 	 */
-	void update();
-
-	/**
-	 * \brief Late update which is called after update().
-	 *
-	 * This function can be used for final adjustments before rendering.
-	 */
-	void late_update();
+	virtual void frame_update();
 
 	/**
 	 * \brief Fixed update executed at a fixed rate.
 	 *
 	 * This function updates physics and game logic based on LoopTimer's fixed_delta_time.
 	 */
-	void fixed_update();
-
-	/**
-	 * \brief Set game running variable
-	 *
-	 * \param running running (false = game shutdown, true = game running)
-	 */
-	void set_running(bool running);
-
-	/**
-	 * \brief Function for executing render-related systems.
-	 *
-	 * Renders the current state of the game to the screen.
-	 */
-	void render();
+	virtual void fixed_update();
 
+	//! Indicates whether the game is running.
 	bool game_running = false;
 
 private:
@@ -95,18 +77,29 @@ private:
 	ComponentManager component_manager{mediator};
 	//! Scene manager instance
 	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();
+	//! LoopTimerManager instance
+	LoopTimerManager loop_timer{mediator};
+	//! EventManager instance
+	EventManager event_manager{mediator};
+	//! Resource manager instance
+	ResourceManager resource_manager{mediator};
+	//! Save manager instance
+	SaveManager save_manager{mediator};
+	//! SDLContext instance
+	SDLContext sdl_context{mediator};
 
 private:
 	/**
+	 * \brief Callback function for ShutDownEvent
+	 *
+	 * This function sets the game_running variable to false, stopping the gameloop and therefor quitting the game.
+	 */
+	bool on_shutdown(const ShutDownEvent & e);
+	/**
 	 * \brief Collection of System instances
 	 *
 	 * This map holds System instances indexed by the system's class typeid. It is filled in the
-	 * constructor of \c LoopManager using LoopManager::load_system.
+	 * constructor of LoopManager using LoopManager::load_system.
 	 */
 	std::unordered_map<std::type_index, std::unique_ptr<System>> systems;
 	/**
diff --git a/src/crepe/api/LoopTimer.cpp b/src/crepe/api/LoopTimer.cpp
deleted file mode 100644
index 15a0e3a..0000000
--- a/src/crepe/api/LoopTimer.cpp
+++ /dev/null
@@ -1,79 +0,0 @@
-#include <chrono>
-
-#include "../facade/SDLContext.h"
-#include "../util/Log.h"
-
-#include "LoopTimer.h"
-
-using namespace crepe;
-
-LoopTimer::LoopTimer() { dbg_trace(); }
-
-LoopTimer & LoopTimer::get_instance() {
-	static LoopTimer instance;
-	return instance;
-}
-
-void LoopTimer::start() {
-	this->last_frame_time = std::chrono::steady_clock::now();
-	this->elapsed_time = std::chrono::milliseconds(0);
-	this->elapsed_fixed_time = std::chrono::milliseconds(0);
-	this->delta_time = std::chrono::milliseconds(0);
-}
-
-void LoopTimer::update() {
-	auto current_frame_time = std::chrono::steady_clock::now();
-	// Convert to duration in seconds for delta time
-	this->delta_time = std::chrono::duration_cast<std::chrono::duration<double>>(
-		current_frame_time - last_frame_time);
-
-	if (this->delta_time > this->maximum_delta_time) {
-		this->delta_time = this->maximum_delta_time;
-	}
-
-	this->delta_time *= this->game_scale;
-	this->elapsed_time += this->delta_time;
-	this->last_frame_time = current_frame_time;
-}
-
-double LoopTimer::get_delta_time() const { return this->delta_time.count(); }
-
-double LoopTimer::get_current_time() const { return this->elapsed_time.count(); }
-
-void LoopTimer::advance_fixed_update() { this->elapsed_fixed_time += this->fixed_delta_time; }
-
-double LoopTimer::get_fixed_delta_time() const { return this->fixed_delta_time.count(); }
-
-void LoopTimer::set_fps(int fps) {
-	this->fps = fps;
-	// target time per frame in seconds
-	this->frame_target_time = std::chrono::duration<double>(1.0) / fps;
-}
-
-int LoopTimer::get_fps() const { return this->fps; }
-
-void LoopTimer::set_game_scale(double value) { this->game_scale = value; }
-
-double LoopTimer::get_game_scale() const { return this->game_scale; }
-void LoopTimer::enforce_frame_rate() {
-	std::chrono::steady_clock::time_point current_frame_time
-		= std::chrono::steady_clock::now();
-	std::chrono::milliseconds frame_duration
-		= std::chrono::duration_cast<std::chrono::milliseconds>(current_frame_time
-																- this->last_frame_time);
-
-	if (frame_duration < this->frame_target_time) {
-		std::chrono::milliseconds delay_time
-			= std::chrono::duration_cast<std::chrono::milliseconds>(this->frame_target_time
-																	- frame_duration);
-		if (delay_time.count() > 0) {
-			SDLContext::get_instance().delay(delay_time.count());
-		}
-	}
-
-	this->last_frame_time = current_frame_time;
-}
-
-double LoopTimer::get_lag() const {
-	return (this->elapsed_time - this->elapsed_fixed_time).count();
-}
diff --git a/src/crepe/api/LoopTimer.h b/src/crepe/api/LoopTimer.h
deleted file mode 100644
index 9393439..0000000
--- a/src/crepe/api/LoopTimer.h
+++ /dev/null
@@ -1,144 +0,0 @@
-#pragma once
-
-#include <chrono>
-
-namespace crepe {
-
-class LoopTimer {
-public:
-	/**
-	 * \brief Get the singleton instance of LoopTimer.
-	 *
-	 * \return A reference to the LoopTimer instance.
-	 */
-	static LoopTimer & get_instance();
-
-	/**
-	 * \brief Get the current delta time for the current frame.
-	 *
-	 * \return Delta time in seconds since the last frame.
-	 */
-	double get_delta_time() const;
-
-	/**
-	 * \brief Get the current game time.
-	 *
-	 * \note The current game time may vary from real-world elapsed time. It is the cumulative
-	 * sum of each frame's delta time.
-	 *
-	 * \return Elapsed game time in seconds.
-	 */
-	double get_current_time() const;
-
-	/**
-	 * \brief Set the target frames per second (FPS).
-	 *
-	 * \param fps The desired frames rendered per second.
-	 */
-	void set_fps(int fps);
-
-	/**
-	 * \brief Get the current frames per second (FPS).
-	 *
-	 * \return Current FPS.
-	 */
-	int get_fps() const;
-
-	/**
-	 * \brief Get the current game scale.
-	 *
-	 * \return The current game scale, where 0 = paused, 1 = normal speed, and values > 1 speed
-	 * up the game.
-	 */
-	double get_game_scale() const;
-
-	/**
-	 * \brief Set the game scale.
-	 *
-	 * \param game_scale The desired game scale (0 = pause, 1 = normal speed, > 1 = speed up).
-	 */
-	void set_game_scale(double game_scale);
-
-private:
-	friend class LoopManager;
-
-	/**
-	 * \brief Start the loop timer.
-	 *
-	 * Initializes the timer to begin tracking frame times.
-	 */
-	void start();
-
-	/**
-	 * \brief Enforce the frame rate limit.
-	 *
-	 * Ensures that the game loop does not exceed the target FPS by delaying frame updates as
-	 * necessary.
-	 */
-	void enforce_frame_rate();
-
-	/**
-	 * \brief Get the fixed delta time for consistent updates.
-	 *
-	 * Fixed delta time is used for operations that require uniform time steps, such as physics
-	 * calculations.
-	 *
-	 * \return Fixed delta time in seconds.
-	 */
-	double get_fixed_delta_time() const;
-
-	/**
-	 * \brief Get the accumulated lag in the game loop.
-	 *
-	 * Lag represents the difference between the target frame time and the actual frame time,
-	 * useful for managing fixed update intervals.
-	 *
-	 * \return Accumulated lag in seconds.
-	 */
-	double get_lag() const;
-
-	/**
-	 * \brief Construct a new LoopTimer object.
-	 *
-	 * Private constructor for singleton pattern to restrict instantiation outside the class.
-	 */
-	LoopTimer();
-
-	/**
-	 * \brief Update the timer to the current frame.
-	 *
-	 * Calculates and updates the delta time for the current frame and adds it to the cumulative
-	 * game time.
-	 */
-	void update();
-
-	/**
-	 * \brief Advance the game loop by a fixed update interval.
-	 *
-	 * This method progresses the game state by a consistent, fixed time step, allowing for
-	 * stable updates independent of frame rate fluctuations.
-	 */
-	void advance_fixed_update();
-
-private:
-	//! Current frames per second
-	int fps = 50;
-	//! Current game scale
-	double game_scale = 1;
-	//! Maximum delta time in seconds to avoid large jumps
-	std::chrono::duration<double> maximum_delta_time{0.25};
-	//! Delta time for the current frame in seconds
-	std::chrono::duration<double> delta_time{0.0};
-	//! Target time per frame in seconds
-	std::chrono::duration<double> frame_target_time = std::chrono::duration<double>(1.0) / fps;
-	//! Fixed delta time for fixed updates in seconds
-	std::chrono::duration<double> fixed_delta_time = std::chrono::duration<double>(1.0) / 50.0;
-	//! Total elapsed game time in seconds
-	std::chrono::duration<double> elapsed_time{0.0};
-	//! Total elapsed time for fixed updates in seconds
-	std::chrono::duration<double> elapsed_fixed_time{0.0};
-	//! Time of the last frame
-	std::chrono::steady_clock::time_point last_frame_time;
-};
-
-} // namespace crepe
diff --git a/src/crepe/api/Script.cpp b/src/crepe/api/Script.cpp
index 4091fd4..753a9e3 100644
--- a/src/crepe/api/Script.cpp
+++ b/src/crepe/api/Script.cpp
@@ -8,8 +8,7 @@ using namespace crepe;
 using namespace std;
 
 Script::~Script() {
-	Mediator & mediator = this->mediator;
-	EventManager & mgr = mediator.event_manager;
+	EventManager & mgr = this->mediator->event_manager;
 	for (auto id : this->listeners) {
 		mgr.unsubscribe(id);
 	}
@@ -21,7 +20,8 @@ void Script::subscribe(const EventHandler<CollisionEvent> & callback) {
 }
 
 void Script::set_next_scene(const string & name) {
-	Mediator & mediator = this->mediator;
-	SceneManager & mgr = mediator.scene_manager;
+	SceneManager & mgr = this->mediator->scene_manager;
 	mgr.set_next_scene(name);
 }
+
+SaveManager & Script::get_save_manager() const { return this->mediator->save_manager; }
diff --git a/src/crepe/api/Script.h b/src/crepe/api/Script.h
index d99ab0e..668e5d1 100644
--- a/src/crepe/api/Script.h
+++ b/src/crepe/api/Script.h
@@ -86,6 +86,25 @@ protected:
 	RefVector<T> get_components() const;
 
 	/**
+	 * \copydoc ComponentManager::get_components_by_id
+	 * \see ComponentManager::get_components_by_id
+	 */
+	template <typename T>
+	RefVector<T> get_components_by_id(game_object_id_t id) const;
+	/**
+	 * \copydoc ComponentManager::get_components_by_name
+	 * \see ComponentManager::get_components_by_name
+	 */
+	template <typename T>
+	RefVector<T> get_components_by_name(const std::string & name) const;
+	/**
+	 * \copydoc ComponentManager::get_components_by_tag
+	 * \see ComponentManager::get_components_by_tag
+	 */
+	template <typename T>
+	RefVector<T> get_components_by_tag(const std::string & tag) const;
+
+	/**
 	 * \brief Log a message using Log::logf
 	 *
 	 * \tparam Args Log::logf parameters
@@ -113,6 +132,9 @@ protected:
 	 */
 	void set_next_scene(const std::string & name);
 
+	//! Retrieve SaveManager reference
+	SaveManager & get_save_manager() const;
+
 	//! \}
 
 private:
diff --git a/src/crepe/api/Script.hpp b/src/crepe/api/Script.hpp
index 45f1ff1..225a51c 100644
--- a/src/crepe/api/Script.hpp
+++ b/src/crepe/api/Script.hpp
@@ -20,10 +20,7 @@ T & Script::get_component() const {
 
 template <typename T>
 RefVector<T> Script::get_components() const {
-	Mediator & mediator = this->mediator;
-	ComponentManager & mgr = mediator.component_manager;
-
-	return mgr.get_components_by_id<T>(this->game_object_id);
+	return this->get_components_by_id<T>(this->game_object_id);
 }
 
 template <typename... Args>
@@ -34,8 +31,7 @@ void Script::logf(Args &&... args) {
 template <typename EventType>
 void Script::subscribe_internal(const EventHandler<EventType> & callback,
 								event_channel_t channel) {
-	Mediator & mediator = this->mediator;
-	EventManager & mgr = mediator.event_manager;
+	EventManager & mgr = this->mediator->event_manager;
 	subscription_t listener = mgr.subscribe<EventType>(
 		[this, callback](const EventType & data) -> bool {
 			bool & active = this->active;
@@ -56,4 +52,26 @@ void Script::subscribe(const EventHandler<EventType> & callback) {
 	this->subscribe_internal(callback, EventManager::CHANNEL_ALL);
 }
 
+template <typename T>
+RefVector<T> Script::get_components_by_id(game_object_id_t id) const {
+	Mediator & mediator = this->mediator;
+	ComponentManager & mgr = mediator.component_manager;
+
+	return mgr.get_components_by_id<T>(id);
+}
+template <typename T>
+RefVector<T> Script::get_components_by_name(const std::string & name) const {
+	Mediator & mediator = this->mediator;
+	ComponentManager & mgr = mediator.component_manager;
+
+	return mgr.get_components_by_name<T>(name);
+}
+template <typename T>
+RefVector<T> Script::get_components_by_tag(const std::string & tag) const {
+	Mediator & mediator = this->mediator;
+	ComponentManager & mgr = mediator.component_manager;
+
+	return mgr.get_components_by_tag<T>(tag);
+}
+
 } // namespace crepe
diff --git a/src/crepe/api/Sprite.cpp b/src/crepe/api/Sprite.cpp
index cc0e20a..ba684ba 100644
--- a/src/crepe/api/Sprite.cpp
+++ b/src/crepe/api/Sprite.cpp
@@ -1,26 +1,21 @@
 #include <cmath>
-#include <utility>
 
 #include "../util/Log.h"
+#include "api/Asset.h"
 
 #include "Component.h"
 #include "Sprite.h"
-#include "Texture.h"
 #include "types.h"
 
 using namespace std;
 using namespace crepe;
 
-Sprite::Sprite(game_object_id_t id, Texture & texture, const Sprite::Data & data)
+Sprite::Sprite(game_object_id_t id, const Asset & texture, const Sprite::Data & data)
 	: Component(id),
-	  texture(std::move(texture)),
+	  source(texture),
 	  data(data) {
 
 	dbg_trace();
-
-	this->mask.w = this->texture.get_size().x;
-	this->mask.h = this->texture.get_size().y;
-	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 dbf41e4..a2409c2 100644
--- a/src/crepe/api/Sprite.h
+++ b/src/crepe/api/Sprite.h
@@ -1,9 +1,9 @@
 #pragma once
 
 #include "../Component.h"
+#include "api/Asset.h"
 
 #include "Color.h"
-#include "Texture.h"
 #include "types.h"
 
 namespace crepe {
@@ -74,24 +74,15 @@ public:
 	 * \param texture asset of the image
 	 * \param ctx all the sprite data
 	 */
-	Sprite(game_object_id_t id, Texture & texture, const Data & data);
+	Sprite(game_object_id_t id, const Asset & texture, const Data & data);
 	~Sprite();
 
 	//! Texture used for the sprite
-	const Texture texture;
+	const Asset source;
 
 	Data data;
 
 private:
-	/**
-	 * \brief ratio of the img
-	 *
-	 * - This will multiply one of \c size variable if it is 0.
-	 * - Will be adjusted if \c Animator component is added to an GameObject that is why this
-	 *   value cannot be const.
-	 */
-	float aspect_ratio;
-
 	//! Reads the mask of sprite
 	friend class SDLContext;
 
@@ -101,6 +92,14 @@ private:
 	//! Reads the all the variables plus the  mask
 	friend class AnimatorSystem;
 
+	/**
+	 * \aspect_ratio the ratio of the sprite image
+	 *
+	 * - this value will only be set by the \c Animator component for the ratio of the Animation
+	 * - if \c Animator component is not added it will not use this ratio (because 0) and will use aspect_ratio of the Asset.
+	 */
+	float aspect_ratio = 0;
+
 	struct Rect {
 		int w = 0;
 		int h = 0;
diff --git a/src/crepe/api/Texture.cpp b/src/crepe/api/Texture.cpp
deleted file mode 100644
index 2b56271..0000000
--- a/src/crepe/api/Texture.cpp
+++ /dev/null
@@ -1,38 +0,0 @@
-#include "../facade/SDLContext.h"
-#include "../util/Log.h"
-
-#include "Asset.h"
-#include "Texture.h"
-#include "types.h"
-
-using namespace crepe;
-using namespace std;
-
-Texture::Texture(const Asset & src) {
-	dbg_trace();
-	this->load(src);
-}
-
-Texture::~Texture() {
-	dbg_trace();
-	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());
-}
-
-ivec2 Texture::get_size() const {
-	if (this->texture == nullptr) return {};
-	return SDLContext::get_instance().get_size(*this);
-}
diff --git a/src/crepe/api/Texture.h b/src/crepe/api/Texture.h
deleted file mode 100644
index 1817910..0000000
--- a/src/crepe/api/Texture.h
+++ /dev/null
@@ -1,69 +0,0 @@
-#pragma once
-
-// FIXME: this header can't be included because this is an API header, and SDL2 development
-// headers won't be bundled with crepe. Why is this facade in the API namespace?
-
-#include <SDL2/SDL_render.h>
-#include <functional>
-#include <memory>
-
-#include "Asset.h"
-#include "types.h"
-
-namespace crepe {
-
-class SDLContext;
-class Animator;
-
-/**
- * \class Texture
- * \brief Manages texture loading and properties.
- *
- * The Texture class is responsible for loading an image from a source and providing access to
- * its dimensions. Textures can be used for rendering.
- */
-class Texture {
-
-public:
-	/**
-	 * \brief Constructs a Texture from an Asset resource.
-	 * \param src Asset with texture data to load.
-	 */
-	Texture(const Asset & src);
-
-	/**
-	 * \brief Destroys the Texture instance, freeing associated resources.
-	 */
-	~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 and height of the texture.
-	 * \return Width and height of the texture in pixels.
-	 */
-	ivec2 get_size() const;
-
-private:
-	/**
-	 * \brief Loads the texture from an Asset resource.
-	 * \param res Unique pointer to an Asset resource to load the texture from.
-	 */
-	void load(const Asset & res);
-
-private:
-	//! The texture of the class from the library
-	std::unique_ptr<SDL_Texture, std::function<void(SDL_Texture *)>> texture;
-
-	//! Grants SDLContext access to private members.
-	friend class SDLContext;
-
-	//! Grants Animator access to private members.
-	friend class Animator;
-};
-
-} // namespace crepe
diff --git a/src/crepe/api/Vector2.h b/src/crepe/api/Vector2.h
index c278c87..bf9d124 100644
--- a/src/crepe/api/Vector2.h
+++ b/src/crepe/api/Vector2.h
@@ -66,6 +66,30 @@ struct Vector2 {
 
 	//! Checks if this vector is not equal to another vector.
 	bool operator!=(const Vector2<T> & other) const;
+
+	//! Truncates the vector to a maximum length.
+	void truncate(T max);
+
+	//! Normalizes the vector (resulting in vector with a length of 1).
+	void normalize();
+
+	//! Returns the length of the vector.
+	T length() const;
+
+	//! Returns the squared length of the vector.
+	T length_squared() const;
+
+	//! Returns the dot product (inwendig product) of this vector and another vector.
+	T dot(const Vector2<T> & other) const;
+
+	//! Returns the distance between this vector and another vector.
+	T distance(const Vector2<T> & other) const;
+
+	//! Returns the squared distance between this vector and another vector.
+	T distance_squared(const Vector2<T> & other) const;
+
+	//! Returns the perpendicular vector to this vector.
+	Vector2 perpendicular() const;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/Vector2.hpp b/src/crepe/api/Vector2.hpp
index cad15f8..ff53cb0 100644
--- a/src/crepe/api/Vector2.hpp
+++ b/src/crepe/api/Vector2.hpp
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <cmath>
+
 #include "Vector2.h"
 
 namespace crepe {
@@ -115,4 +117,50 @@ bool Vector2<T>::operator!=(const Vector2<T> & other) const {
 	return !(*this == other);
 }
 
+template <class T>
+void Vector2<T>::truncate(T max) {
+	if (length() > max) {
+		normalize();
+		*this *= max;
+	}
+}
+
+template <class T>
+void Vector2<T>::normalize() {
+	T len = length();
+	if (len > 0) {
+		*this /= len;
+	}
+}
+
+template <class T>
+T Vector2<T>::length() const {
+	return std::sqrt(x * x + y * y);
+}
+
+template <class T>
+T Vector2<T>::length_squared() const {
+	return x * x + y * y;
+}
+
+template <class T>
+T Vector2<T>::dot(const Vector2<T> & other) const {
+	return x * other.x + y * other.y;
+}
+
+template <class T>
+T Vector2<T>::distance(const Vector2<T> & other) const {
+	return (*this - other).length();
+}
+
+template <class T>
+T Vector2<T>::distance_squared(const Vector2<T> & other) const {
+	return (*this - other).length_squared();
+}
+
+template <class T>
+Vector2<T> Vector2<T>::perpendicular() const {
+	return {-y, x};
+}
+
 } // namespace crepe
diff --git a/src/crepe/facade/CMakeLists.txt b/src/crepe/facade/CMakeLists.txt
index 4cc53bc..0598e16 100644
--- a/src/crepe/facade/CMakeLists.txt
+++ b/src/crepe/facade/CMakeLists.txt
@@ -1,5 +1,6 @@
 target_sources(crepe PUBLIC
 	Sound.cpp
+	Texture.cpp
 	SoundContext.cpp
 	SDLContext.cpp
 	DB.cpp
@@ -7,6 +8,7 @@ target_sources(crepe PUBLIC
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Sound.h
+	Texture.h
 	SoundContext.h
 	SDLContext.h
 	DB.h
diff --git a/src/crepe/facade/SDLContext.cpp b/src/crepe/facade/SDLContext.cpp
index 8f6c02c..4552605 100644
--- a/src/crepe/facade/SDLContext.cpp
+++ b/src/crepe/facade/SDLContext.cpp
@@ -2,6 +2,7 @@
 #include <SDL2/SDL_blendmode.h>
 #include <SDL2/SDL_image.h>
 #include <SDL2/SDL_keycode.h>
+#include <SDL2/SDL_pixels.h>
 #include <SDL2/SDL_rect.h>
 #include <SDL2/SDL_render.h>
 #include <SDL2/SDL_surface.h>
@@ -18,23 +19,18 @@
 #include "../api/Color.h"
 #include "../api/Config.h"
 #include "../api/Sprite.h"
-#include "../api/Texture.h"
 #include "../util/Log.h"
+#include "manager/Mediator.h"
 
 #include "SDLContext.h"
+#include "Texture.h"
 #include "types.h"
 
 using namespace crepe;
 using namespace std;
 
-SDLContext & SDLContext::get_instance() {
-	static SDLContext instance;
-	return instance;
-}
-
-SDLContext::SDLContext() {
+SDLContext::SDLContext(Mediator & mediator) {
 	dbg_trace();
-
 	if (SDL_Init(SDL_INIT_VIDEO) != 0) {
 		throw runtime_error(format("SDLContext: SDL_Init error: {}", SDL_GetError()));
 	}
@@ -62,6 +58,8 @@ SDLContext::SDLContext() {
 	if (!(IMG_Init(img_flags) & img_flags)) {
 		throw runtime_error("SDLContext: SDL_image could not initialize!");
 	}
+
+	mediator.sdl_context = *this;
 }
 
 SDLContext::~SDLContext() {
@@ -236,35 +234,26 @@ 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.mask.x,
-		.y = sprite.mask.y,
-		.w = sprite.mask.w,
-		.h = sprite.mask.h,
-	};
-}
-
 SDL_FRect SDLContext::get_dst_rect(const DestinationRectangleData & ctx) const {
 
 	const Sprite::Data & data = ctx.sprite.data;
 
+	float aspect_ratio
+		= (ctx.sprite.aspect_ratio == 0) ? ctx.texture.get_ratio() : ctx.sprite.aspect_ratio;
+
 	vec2 size = data.size;
 	if (data.size.x == 0 && data.size.y != 0) {
-		size.x = data.size.y * ctx.sprite.aspect_ratio;
+		size.x = data.size.y * aspect_ratio;
 	}
 	if (data.size.y == 0 && data.size.x != 0) {
-		size.y = data.size.x / ctx.sprite.aspect_ratio;
+		size.y = data.size.x / aspect_ratio;
 	}
+	size *= cam_aux_data.render_scale * ctx.img_scale * data.scale_offset;
 
-	const CameraValues & cam = ctx.cam;
-
-	size *= cam.render_scale * ctx.img_scale * data.scale_offset;
-
-	vec2 screen_pos
-		= (ctx.pos + data.position_offset - cam.cam_pos + (cam.zoomed_viewport) / 2)
-			  * cam.render_scale
-		  - size / 2 + cam.bar_size;
+	vec2 screen_pos = (ctx.pos + data.position_offset - cam_aux_data.cam_pos
+					   + (cam_aux_data.zoomed_viewport) / 2)
+						  * cam_aux_data.render_scale
+					  - size / 2 + cam_aux_data.bar_size;
 
 	return SDL_FRect{
 		.x = screen_pos.x,
@@ -275,31 +264,38 @@ SDL_FRect SDLContext::get_dst_rect(const DestinationRectangleData & ctx) const {
 }
 
 void SDLContext::draw(const RenderContext & ctx) {
-
 	const Sprite::Data & data = ctx.sprite.data;
 	SDL_RendererFlip render_flip
 		= (SDL_RendererFlip) ((SDL_FLIP_HORIZONTAL * data.flip.flip_x)
 							  | (SDL_FLIP_VERTICAL * data.flip.flip_y));
 
-	SDL_Rect srcrect = this->get_src_rect(ctx.sprite);
+	SDL_Rect srcrect;
+	SDL_Rect * srcrect_ptr = NULL;
+	if (ctx.sprite.mask.w != 0 || ctx.sprite.mask.h != 0) {
+		srcrect.w = ctx.sprite.mask.w;
+		srcrect.h = ctx.sprite.mask.h;
+		srcrect.x = ctx.sprite.mask.x;
+		srcrect.y = ctx.sprite.mask.y;
+		srcrect_ptr = &srcrect;
+	}
+
 	SDL_FRect dstrect = this->get_dst_rect(SDLContext::DestinationRectangleData{
 		.sprite = ctx.sprite,
-		.cam = ctx.cam,
+		.texture = ctx.texture,
 		.pos = ctx.pos,
 		.img_scale = ctx.scale,
 	});
 
 	double angle = ctx.angle + data.angle_offset;
 
-	this->set_color_texture(ctx.sprite.texture, ctx.sprite.data.color);
-	SDL_RenderCopyExF(this->game_renderer.get(), ctx.sprite.texture.texture.get(), &srcrect,
-					  &dstrect, angle, NULL, render_flip);
+	this->set_color_texture(ctx.texture, ctx.sprite.data.color);
+	SDL_RenderCopyExF(this->game_renderer.get(), ctx.texture.get_img(), srcrect_ptr, &dstrect,
+					  angle, NULL, render_flip);
 }
 
-SDLContext::CameraValues SDLContext::set_camera(const Camera & cam) {
+void SDLContext::update_camera_view(const Camera & cam, const vec2 & new_pos) {
 
 	const Camera::Data & cam_data = cam.data;
-	CameraValues ret_cam;
 	// resize window
 	int w, h;
 	SDL_GetWindowSize(this->game_window.get(), &w, &h);
@@ -307,9 +303,10 @@ SDLContext::CameraValues SDLContext::set_camera(const Camera & cam) {
 		SDL_SetWindowSize(this->game_window.get(), cam.screen.x, cam.screen.y);
 	}
 
-	vec2 & zoomed_viewport = ret_cam.zoomed_viewport;
-	vec2 & bar_size = ret_cam.bar_size;
-	vec2 & render_scale = ret_cam.render_scale;
+	vec2 & zoomed_viewport = this->cam_aux_data.zoomed_viewport;
+	vec2 & bar_size = this->cam_aux_data.bar_size;
+	vec2 & render_scale = this->cam_aux_data.render_scale;
+	this->cam_aux_data.cam_pos = new_pos;
 
 	zoomed_viewport = cam.viewport_size * cam_data.zoom;
 	float screen_aspect = static_cast<float>(cam.screen.x) / cam.screen.y;
@@ -351,12 +348,8 @@ SDLContext::CameraValues SDLContext::set_camera(const Camera & cam) {
 
 	// fill bg color
 	SDL_RenderFillRect(this->game_renderer.get(), &bg);
-
-	return ret_cam;
 }
 
-uint64_t SDLContext::get_ticks() const { return SDL_GetTicks64(); }
-
 std::unique_ptr<SDL_Texture, std::function<void(SDL_Texture *)>>
 SDLContext::texture_from_path(const std::string & path) {
 
@@ -383,18 +376,17 @@ SDLContext::texture_from_path(const std::string & path) {
 
 ivec2 SDLContext::get_size(const Texture & ctx) {
 	ivec2 size;
-	SDL_QueryTexture(ctx.texture.get(), NULL, NULL, &size.x, &size.y);
+	SDL_QueryTexture(ctx.get_img(), NULL, NULL, &size.x, &size.y);
 	return size;
 }
 
-void SDLContext::delay(int ms) const { SDL_Delay(ms); }
-
 std::vector<SDLContext::EventData> SDLContext::get_events() {
 	std::vector<SDLContext::EventData> event_list;
 	SDL_Event event;
-
-	// Handle general SDL events
 	while (SDL_PollEvent(&event)) {
+		ivec2 mouse_pos;
+		mouse_pos.x = (event.button.x - cam.bar_size.x) / cam.render_scale.x;
+		mouse_pos.y = (event.button.y - cam.bar_size.y) / cam.render_scale.y;
 		switch (event.type) {
 			case SDL_QUIT:
 				event_list.push_back({SDLContext::EventType::SHUTDOWN, {}, {}, {}});
@@ -413,41 +405,38 @@ std::vector<SDLContext::EventData> SDLContext::get_events() {
 									  {}});
 				break;
 			case SDL_MOUSEBUTTONDOWN:
-				event_list.push_back({SDLContext::EventType::MOUSEDOWN,
-									  {},
-									  {sdl_to_mousebutton(event.button.button),
-									   {event.button.x, event.button.y}},
-									  {}});
+				event_list.push_back(EventData{
+					.event_type = SDLContext::EventType::MOUSEDOWN,
+					.mouse_button = sdl_to_mousebutton(event.button.button),
+					.mouse_position = {event.button.x, event.button.y},
+				});
 				break;
-			case SDL_MOUSEBUTTONUP:
-				event_list.push_back({SDLContext::EventType::MOUSEUP,
-									  {},
-									  {sdl_to_mousebutton(event.button.button),
-									   {event.button.x, event.button.y}},
-									  {}});
-				break;
-			case SDL_MOUSEMOTION:
-				event_list.push_back({SDLContext::EventType::MOUSEMOVE,
-									  {},
-									  {{},
-									   {event.motion.x, event.motion.y},
-									   -1,
-									   INFINITY,
-									   {event.motion.xrel, event.motion.yrel}},
-									  {}});
-				break;
-			case SDL_MOUSEWHEEL:
+			case SDL_MOUSEBUTTONUP: {
+				int x, y;
+				SDL_GetMouseState(&x, &y);
+				event_list.push_back(EventData{
+					.event_type = SDLContext::EventType::MOUSEUP,
+					.mouse_button = sdl_to_mousebutton(event.button.button),
+					.mouse_position = {event.button.x, event.button.y},
+				});
+			} break;
+
+			case SDL_MOUSEMOTION: {
 				event_list.push_back(
-					{SDLContext::EventType::MOUSEWHEEL,
-					 {},
-					 {{}, {}, event.wheel.y < 0 ? -1 : 1, event.wheel.preciseY, {}},
-					 {}});
-				break;
-
-			// Forward window events for further processing
-			case SDL_WINDOWEVENT:
-				this->handle_window_event(event.window, event_list);
-				break;
+					EventData{.event_type = SDLContext::EventType::MOUSEMOVE,
+							  .mouse_position = {event.motion.x, event.motion.y},
+							  .rel_mouse_move = {event.motion.xrel, event.motion.yrel}});
+			} break;
+
+			case SDL_MOUSEWHEEL: {
+				event_list.push_back(EventData{
+					.event_type = SDLContext::EventType::MOUSEWHEEL,
+					.mouse_position = {event.motion.x, event.motion.y},
+					// TODO: why is this needed?
+					.scroll_direction = event.wheel.y < 0 ? -1 : 1,
+					.scroll_delta = event.wheel.preciseY,
+				});
+			} break;
 		}
 	}
 
@@ -489,6 +478,6 @@ void SDLContext::handle_window_event(const SDL_WindowEvent & window_event,
 }
 
 void SDLContext::set_color_texture(const Texture & texture, const Color & color) {
-	SDL_SetTextureColorMod(texture.texture.get(), color.r, color.g, color.b);
-	SDL_SetTextureAlphaMod(texture.texture.get(), color.a);
+	SDL_SetTextureColorMod(texture.get_img(), color.r, color.g, color.b);
+	SDL_SetTextureAlphaMod(texture.get_img(), color.a);
 }
diff --git a/src/crepe/facade/SDLContext.h b/src/crepe/facade/SDLContext.h
index 053aa59..0a2456d 100644
--- a/src/crepe/facade/SDLContext.h
+++ b/src/crepe/facade/SDLContext.h
@@ -15,16 +15,16 @@
 #include "api/Color.h"
 #include "api/KeyCodes.h"
 #include "api/Sprite.h"
-#include "api/Texture.h"
 #include "api/Transform.h"
+
 #include "types.h"
 
 namespace crepe {
 
-class LoopManager;
-class InputSystem;
+class Texture;
+class Mediator;
+
 /**
- * \class SDLContext
  * \brief Facade for the SDL library
  *
  * SDLContext is a singleton that handles the SDL window and renderer, provides methods for
@@ -33,7 +33,7 @@ class InputSystem;
 class SDLContext {
 public:
 	//! data that the camera component cannot hold
-	struct CameraValues {
+	struct CameraAuxiliaryData {
 
 		//! zoomed in viewport in game_units
 		vec2 zoomed_viewport;
@@ -63,7 +63,7 @@ public:
 	//! rendering data needed to render on screen
 	struct RenderContext {
 		const Sprite & sprite;
-		const CameraValues & cam;
+		const Texture & texture;
 		const vec2 & pos;
 		const double & angle;
 		const double & scale;
@@ -129,14 +129,26 @@ public:
 	 */
 	static SDLContext & get_instance();
 
+public:
 	SDLContext(const SDLContext &) = delete;
 	SDLContext(SDLContext &&) = delete;
 	SDLContext & operator=(const SDLContext &) = delete;
 	SDLContext & operator=(SDLContext &&) = delete;
 
-private:
-	//! will only use get_events
-	friend class InputSystem;
+public:
+	/**
+	 * \brief Constructs an SDLContext instance.
+	 * Initializes SDL, creates a window and renderer.
+	 */
+	SDLContext(Mediator & mediator);
+
+	/**
+	 * \brief Destroys the SDLContext instance.
+	 * Cleans up SDL resources, including the window and renderer.
+	 */
+	~SDLContext();
+
+public:
 	/**
 	 * \brief Retrieves a list of all events from the SDL context.
 	 *
@@ -177,9 +189,7 @@ private:
 	 */
 	MouseButton sdl_to_mousebutton(Uint8 sdl_button);
 
-private:
-	//! Will only use delay
-	friend class LoopTimer;
+public:
 	/**
 	 * \brief Gets the current SDL ticks since the program started.
 	 * \return Current ticks in milliseconds as a constant uint64_t.
@@ -195,23 +205,7 @@ private:
 	 */
 	void delay(int ms) const;
 
-private:
-	/**
-	 * \brief Constructs an SDLContext instance.
-	 * Initializes SDL, creates a window and renderer.
-	 */
-	SDLContext();
-
-	/**
-	 * \brief Destroys the SDLContext instance.
-	 * Cleans up SDL resources, including the window and renderer.
-	 */
-	~SDLContext();
-
-private:
-	//! Will use the funtions: texture_from_path, get_width,get_height.
-	friend class Texture;
-
+public:
 	/**
 	 * \brief Loads a texture from a file path.
 	 * \param path Path to the image file.
@@ -222,14 +216,11 @@ private:
 	/**
 	 * \brief Gets the size of a texture.
 	 * \param texture Reference to the Texture object.
-	 * \return Width and height of the texture as an integer.
+	 * \return Width and height of the texture as an integer in pixels.
 	 */
 	ivec2 get_size(const Texture & ctx);
 
-private:
-	//! Will use draw,clear_screen, present_screen, camera.
-	friend class RenderSystem;
-
+public:
 	/**
 	 * \brief Draws a sprite to the screen using the specified transform and camera.
 	 * \param RenderContext Reference to rendering data to draw
@@ -243,35 +234,28 @@ private:
 	void present_screen();
 
 	/**
-	 * \brief sets the background of the camera (will be adjusted in future PR)
-	 * \param camera Reference to the Camera object.
+	 * \brief calculates camera view settings. such as black_bars, zoomed_viewport, scaling and
+	 * adjusting window size.
+	 *
+	 * \note only supports windowed mode.
+	 * \param camera Reference to the current Camera object in the scene.
+	 * \param new_pos new camera position from transform and offset
 	 */
-	CameraValues set_camera(const Camera & camera);
+	void update_camera_view(const Camera & camera, const vec2 & new_pos);
 
-private:
+public:
 	//! the data needed to construct a sdl dst rectangle
 	struct DestinationRectangleData {
 		const Sprite & sprite;
-		const CameraValues & cam;
+		const Texture & texture;
 		const vec2 & pos;
 		const double & img_scale;
 	};
-	/**
-	 * \brief calculates the sqaure size of the image
-	 *
-	 * \param sprite Reference to the sprite to calculate the rectangle
-	 * \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 destination
 	 *
-	 * \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
+	 * \param data needed to calculate a destination rectangle
 	 * \return sdl rectangle to draw a dst image to draw on the screen
 	 */
 	SDL_FRect get_dst_rect(const DestinationRectangleData & data) const;
@@ -292,6 +276,13 @@ private:
 
 	//! black bars rectangle to draw
 	SDL_FRect black_bars[2] = {};
+
+	/**
+	 * \cam_aux_data extra data that the component cannot hold.
+	 *
+	 * - this is defined in this class because get_events() needs this information aswell
+	 */
+	CameraAuxiliaryData cam_aux_data;
 };
 
 } // namespace crepe
diff --git a/src/crepe/facade/Sound.cpp b/src/crepe/facade/Sound.cpp
index 4d3abf5..97e455e 100644
--- a/src/crepe/facade/Sound.cpp
+++ b/src/crepe/facade/Sound.cpp
@@ -1,59 +1,13 @@
+#include "../api/Asset.h"
 #include "../util/Log.h"
 
 #include "Sound.h"
-#include "SoundContext.h"
 
 using namespace crepe;
 using namespace std;
 
-Sound::Sound(unique_ptr<Asset> res) {
+Sound::Sound(const Asset & src, Mediator & mediator) : Resource(src, mediator) {
+	this->sample.load(src.get_path().c_str());
 	dbg_trace();
-	this->load(std::move(res));
-}
-
-Sound::Sound(const char * src) {
-	dbg_trace();
-	this->load(make_unique<Asset>(src));
-}
-
-void Sound::load(unique_ptr<Asset> res) { this->sample.load(res->get_path().c_str()); }
-
-void Sound::play() {
-	SoundContext & ctx = SoundContext::get_instance();
-	if (ctx.engine.getPause(this->handle)) {
-		// resume if paused
-		ctx.engine.setPause(this->handle, false);
-	} else {
-		// or start new sound
-		this->handle = ctx.engine.play(this->sample, this->volume);
-		ctx.engine.setLooping(this->handle, this->looping);
-	}
-}
-
-void Sound::pause() {
-	SoundContext & ctx = SoundContext::get_instance();
-	if (ctx.engine.getPause(this->handle)) return;
-	ctx.engine.setPause(this->handle, true);
-}
-
-void Sound::rewind() {
-	SoundContext & ctx = SoundContext::get_instance();
-	if (!ctx.engine.isValidVoiceHandle(this->handle)) return;
-	ctx.engine.seek(this->handle, 0);
-}
-
-void Sound::set_volume(float volume) {
-	this->volume = volume;
-
-	SoundContext & ctx = SoundContext::get_instance();
-	if (!ctx.engine.isValidVoiceHandle(this->handle)) return;
-	ctx.engine.setVolume(this->handle, this->volume);
-}
-
-void Sound::set_looping(bool looping) {
-	this->looping = looping;
-
-	SoundContext & ctx = SoundContext::get_instance();
-	if (!ctx.engine.isValidVoiceHandle(this->handle)) return;
-	ctx.engine.setLooping(this->handle, this->looping);
 }
+Sound::~Sound() { dbg_trace(); }
diff --git a/src/crepe/facade/Sound.h b/src/crepe/facade/Sound.h
index ee43d94..4a5d692 100644
--- a/src/crepe/facade/Sound.h
+++ b/src/crepe/facade/Sound.h
@@ -1,84 +1,31 @@
 #pragma once
 
-#include <memory>
 #include <soloud/soloud.h>
 #include <soloud/soloud_wav.h>
 
-#include "../api/Asset.h"
+#include "../Resource.h"
 
 namespace crepe {
 
+class SoundContext;
+class Mediator;
+
 /**
  * \brief Sound resource facade
  *
- * This class is a wrapper around a \c SoLoud::Wav instance, which holds a
- * single sample. It is part of the sound facade.
+ * This class is a wrapper around a \c SoLoud::Wav instance, which holds a single sample. It is
+ * part of the sound facade.
  */
-class Sound {
-public:
-	/**
-	 * \brief Pause this sample
-	 *
-	 * Pauses this sound if it is playing, or does nothing if it is already paused. The playhead
-	 * position is saved, such that calling \c play() after this function makes the sound resume.
-	 */
-	void pause();
-	/**
-	 * \brief Play this sample
-	 *
-	 * Resume playback if this sound is paused, or start from the beginning of the sample.
-	 *
-	 * \note This class only saves a reference to the most recent 'voice' of this sound. Calling
-	 * \c play() while the sound is already playing causes multiple instances of the sample to
-	 * play simultaniously. The sample started last is the one that is controlled afterwards.
-	 */
-	void play();
-	/**
-	 * \brief Reset playhead position
-	 *
-	 * Resets the playhead position so that calling \c play() after this function makes it play
-	 * from the start of the sample. If the sound is not paused before calling this function,
-	 * this function will stop playback.
-	 */
-	void rewind();
-	/**
-	 * \brief Set playback volume / gain
-	 *
-	 * \param volume  Volume (0 = muted, 1 = full volume)
-	 */
-	void set_volume(float volume);
-	/**
-	 * \brief Get playback volume / gain
-	 *
-	 * \return Volume
-	 */
-	float get_volume() const { return this->volume; }
-	/**
-	 * \brief Set looping behavior for this sample
-	 *
-	 * \param looping  Looping behavior (false = one-shot, true = loop)
-	 */
-	void set_looping(bool looping);
-	/**
-	 * \brief Get looping behavior
-	 *
-	 * \return true if looping, false if one-shot
-	 */
-	bool get_looping() const { return this->looping; }
-
+class Sound : public Resource {
 public:
-	Sound(const char * src);
-	Sound(std::unique_ptr<Asset> res);
-
-private:
-	void load(std::unique_ptr<Asset> res);
+	Sound(const Asset & src, Mediator & mediator);
+	~Sound(); // dbg_trace
 
 private:
+	//! Deserialized resource (soloud)
 	SoLoud::Wav sample;
-	SoLoud::handle handle;
-
-	float volume = 1.0f;
-	bool looping = false;
+	//! SoundContext uses \c sample
+	friend class SoundContext;
 };
 
 } // namespace crepe
diff --git a/src/crepe/facade/SoundContext.cpp b/src/crepe/facade/SoundContext.cpp
index deb2b62..b1f8cb3 100644
--- a/src/crepe/facade/SoundContext.cpp
+++ b/src/crepe/facade/SoundContext.cpp
@@ -4,17 +4,33 @@
 
 using namespace crepe;
 
-SoundContext & SoundContext::get_instance() {
-	static SoundContext instance;
-	return instance;
-}
-
 SoundContext::SoundContext() {
 	dbg_trace();
-	engine.init();
+	this->engine.init();
+	this->engine.setMaxActiveVoiceCount(this->config.audio.voices);
 }
 
 SoundContext::~SoundContext() {
 	dbg_trace();
-	engine.deinit();
+	this->engine.deinit();
+}
+
+SoundHandle SoundContext::play(Sound & resource) {
+	SoLoud::handle real_handle = this->engine.play(resource.sample, 1.0f);
+	SoundHandle handle = this->next_handle;
+	this->registry[handle] = real_handle;
+	this->next_handle++;
+	return handle;
+}
+
+void SoundContext::stop(const SoundHandle & handle) {
+	this->engine.stop(this->registry[handle]);
+}
+
+void SoundContext::set_volume(const SoundHandle & handle, float volume) {
+	this->engine.setVolume(this->registry[handle], volume);
+}
+
+void SoundContext::set_loop(const SoundHandle & handle, bool loop) {
+	this->engine.setLooping(this->registry[handle], loop);
 }
diff --git a/src/crepe/facade/SoundContext.h b/src/crepe/facade/SoundContext.h
index d703c16..d986c59 100644
--- a/src/crepe/facade/SoundContext.h
+++ b/src/crepe/facade/SoundContext.h
@@ -2,30 +2,80 @@
 
 #include <soloud/soloud.h>
 
+#include "../api/Config.h"
+
 #include "Sound.h"
+#include "SoundHandle.h"
 
 namespace crepe {
 
 /**
  * \brief Sound engine facade
  *
- * This class is a wrapper around a \c SoLoud::Soloud instance, which provides
- * the methods for playing \c Sound instances. It is part of the sound facade.
+ * This class is a wrapper around a \c SoLoud::Soloud instance, which provides the methods for
+ * playing \c Sound instances. It is part of the sound facade.
  */
 class SoundContext {
-private:
-	// singleton
+public:
 	SoundContext();
 	virtual ~SoundContext();
+
 	SoundContext(const SoundContext &) = delete;
 	SoundContext(SoundContext &&) = delete;
 	SoundContext & operator=(const SoundContext &) = delete;
 	SoundContext & operator=(SoundContext &&) = delete;
 
+	/**
+	 * \brief Play a sample
+	 *
+	 * Plays a Sound from the beginning of the sample and returns a handle to control it later.
+	 *
+	 * \param resource Sound instance to play
+	 *
+	 * \returns Handle to control this voice
+	 */
+	virtual SoundHandle play(Sound & resource);
+	/**
+	 * \brief Stop a voice immediately if it is still playing
+	 *
+	 * \note This function does nothing if the handle is invalid or if the sound is already
+	 * stopped / finished playing.
+	 *
+	 * \param handle Voice handle returned by SoundContext::play
+	 */
+	virtual void stop(const SoundHandle & handle);
+	/**
+	 * \brief Change the volume of a voice
+	 *
+	 * \note This function does nothing if the handle is invalid or if the sound is already
+	 * stopped / finished playing.
+	 *
+	 * \param handle Voice handle returned by SoundContext::play
+	 * \param volume New gain value (0=silent, 1=default)
+	 */
+	virtual void set_volume(const SoundHandle & handle, float volume);
+	/**
+	 * \brief Set the looping behavior of a voice
+	 *
+	 * \note This function does nothing if the handle is invalid or if the sound is already
+	 * stopped / finished playing.
+	 *
+	 * \param handle Voice handle returned by SoundContext::play
+	 * \param loop Looping behavior (false=oneshot, true=loop)
+	 */
+	virtual void set_loop(const SoundHandle & handle, bool loop);
+
 private:
-	static SoundContext & get_instance();
+	//! Abstracted class
 	SoLoud::Soloud engine;
-	friend class Sound;
+
+	//! Config reference
+	Config & config = Config::get_instance();
+
+	//! Sound handle registry
+	std::unordered_map<SoundHandle, SoLoud::handle> registry;
+	//! Unique handle counter
+	SoundHandle next_handle = 0;
 };
 
 } // namespace crepe
diff --git a/src/crepe/facade/SoundHandle.h b/src/crepe/facade/SoundHandle.h
new file mode 100644
index 0000000..b7925fc
--- /dev/null
+++ b/src/crepe/facade/SoundHandle.h
@@ -0,0 +1,12 @@
+#pragma once
+
+#include <cstddef>
+
+namespace crepe {
+
+/**
+ * \brief Voice handle returned by
+ */
+typedef size_t SoundHandle;
+
+} // namespace crepe
diff --git a/src/crepe/facade/Texture.cpp b/src/crepe/facade/Texture.cpp
new file mode 100644
index 0000000..b63403d
--- /dev/null
+++ b/src/crepe/facade/Texture.cpp
@@ -0,0 +1,28 @@
+#include "../util/Log.h"
+#include "facade/SDLContext.h"
+#include "manager/Mediator.h"
+
+#include "Resource.h"
+#include "Texture.h"
+#include "types.h"
+
+using namespace crepe;
+using namespace std;
+
+Texture::Texture(const Asset & src, Mediator & mediator) : Resource(src, mediator) {
+	dbg_trace();
+	SDLContext & ctx = mediator.sdl_context;
+	this->texture = ctx.texture_from_path(src.get_path());
+	this->size = ctx.get_size(*this);
+	this->aspect_ratio = static_cast<float>(this->size.x) / this->size.y;
+}
+
+Texture::~Texture() {
+	dbg_trace();
+	this->texture.reset();
+}
+
+const ivec2 & Texture::get_size() const noexcept { return this->size; }
+const float & Texture::get_ratio() const noexcept { return this->aspect_ratio; }
+
+SDL_Texture * Texture::get_img() const noexcept { return this->texture.get(); }
diff --git a/src/crepe/facade/Texture.h b/src/crepe/facade/Texture.h
new file mode 100644
index 0000000..cdacac4
--- /dev/null
+++ b/src/crepe/facade/Texture.h
@@ -0,0 +1,69 @@
+#pragma once
+
+#include <SDL2/SDL_render.h>
+#include <memory>
+
+#include "../Resource.h"
+
+#include "types.h"
+
+namespace crepe {
+
+class Mediator;
+class Asset;
+
+/**
+ * \class Texture
+ * \brief Manages texture loading and properties.
+ *
+ * The Texture class is responsible for loading an image from a source and providing access to
+ * its dimensions. Textures can be used for rendering.
+ */
+class Texture : public Resource {
+
+public:
+	/**
+	 * \brief Constructs a Texture from an Asset resource.
+	 * \param src Asset with texture data to load.
+	 * \param mediator use the SDLContext reference to load the image
+	 */
+	Texture(const Asset & src, Mediator & mediator);
+
+	/**
+	 * \brief Destroys the Texture instance
+	 */
+	~Texture();
+
+	/**
+	 * \brief get width and height of image in pixels
+	 * \return pixel size width and height
+	 *
+	 */
+	const ivec2 & get_size() const noexcept;
+
+	/**
+	 * \brief aspect_ratio of image
+	 * \return ratio
+	 *
+	 */
+	const float & get_ratio() const noexcept;
+
+	/**
+	 * \brief get the image texture
+	 * \return SDL_Texture
+	 *
+	 */
+	SDL_Texture * get_img() const noexcept;
+
+private:
+	//! The texture of the class from the library
+	std::unique_ptr<SDL_Texture, std::function<void(SDL_Texture *)>> texture;
+
+	// texture size in pixel
+	ivec2 size;
+
+	//! ratio of image
+	float aspect_ratio;
+};
+
+} // namespace crepe
diff --git a/src/crepe/manager/CMakeLists.txt b/src/crepe/manager/CMakeLists.txt
index 517b8a2..f73e165 100644
--- a/src/crepe/manager/CMakeLists.txt
+++ b/src/crepe/manager/CMakeLists.txt
@@ -4,6 +4,8 @@ target_sources(crepe PUBLIC
 	Manager.cpp
 	SaveManager.cpp
 	SceneManager.cpp
+	LoopTimerManager.cpp
+	ResourceManager.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -16,5 +18,8 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	SaveManager.h
 	SceneManager.h
 	SceneManager.hpp
+	LoopTimerManager.h
+	ResourceManager.h
+	ResourceManager.hpp
 )
 
diff --git a/src/crepe/manager/ComponentManager.cpp b/src/crepe/manager/ComponentManager.cpp
index 80cf8b4..df30d27 100644
--- a/src/crepe/manager/ComponentManager.cpp
+++ b/src/crepe/manager/ComponentManager.cpp
@@ -1,4 +1,5 @@
 #include "../api/GameObject.h"
+#include "../api/Metadata.h"
 #include "../types.h"
 #include "../util/Log.h"
 
@@ -61,3 +62,13 @@ GameObject ComponentManager::new_object(const string & name, const string & tag,
 void ComponentManager::set_persistent(game_object_id_t id, bool persistent) {
 	this->persistent[id] = persistent;
 }
+
+set<game_object_id_t> ComponentManager::get_objects_by_name(const string & name) const {
+	return this->get_objects_by_predicate<Metadata>(
+		[name](const Metadata & data) { return data.name == name; });
+}
+
+set<game_object_id_t> ComponentManager::get_objects_by_tag(const string & tag) const {
+	return this->get_objects_by_predicate<Metadata>(
+		[tag](const Metadata & data) { return data.tag == tag; });
+}
diff --git a/src/crepe/manager/ComponentManager.h b/src/crepe/manager/ComponentManager.h
index 44429d9..19a8e81 100644
--- a/src/crepe/manager/ComponentManager.h
+++ b/src/crepe/manager/ComponentManager.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <memory>
+#include <set>
 #include <typeindex>
 #include <unordered_map>
 #include <vector>
@@ -134,8 +135,77 @@ public:
 	 */
 	template <typename T>
 	RefVector<T> get_components_by_type() const;
+	/**
+	 * \brief Get all components of a specific type on a GameObject with name \c name
+	 * 
+	 * \tparam T The type of the component
+	 * \param name Metadata::name for the same game_object_id as the returned components
+	 * \return Components matching criteria
+	 */
+	template <typename T>
+	RefVector<T> get_components_by_name(const std::string & name) const;
+	/**
+	 * \brief Get all components of a specific type on a GameObject with tag \c tag
+	 * 
+	 * \tparam T The type of the component
+	 * \param name Metadata::tag for the same game_object_id as the returned components
+	 * \return Components matching criteria
+	 */
+	template <typename T>
+	RefVector<T> get_components_by_tag(const std::string & tag) const;
+
+private:
+	/**
+	 * \brief Get object IDs by predicate function
+	 *
+	 * This function calls the predicate function \c pred for all components matching type \c T,
+	 * and adds their parent game_object_id to a \c std::set if the predicate returns true.
+	 *
+	 * \tparam T The type of the component to check the predicate against
+	 * \param pred Predicate function
+	 *
+	 * \note The predicate function may be called for multiple components with the same \c
+	 * game_object_id. In this case, the ID is added if *any* call returns \c true.
+	 *
+	 * \returns game_object_id for all components where the predicate returned true
+	 */
+	template <typename T>
+	std::set<game_object_id_t>
+	get_objects_by_predicate(const std::function<bool(const T &)> & pred) const;
+
+	/**
+	 * \brief Get components of type \c T for multiple game object IDs
+	 *
+	 * \tparam T The type of the components to return
+	 * \param ids The object IDs
+	 *
+	 * \return All components matching type \c T and one of the IDs in \c ids
+	 */
+	template <typename T>
+	RefVector<T> get_components_by_ids(const std::set<game_object_id_t> & ids) const;
+
+	/**
+	 * \brief Get object IDs for objects with name \c name
+	 *
+	 * \param name Object name to match
+	 * \returns Object IDs where Metadata::name is equal to \c name
+	 */
+	std::set<game_object_id_t> get_objects_by_name(const std::string & name) const;
+	/**
+	 * \brief Get object IDs for objects with tag \c tag
+	 *
+	 * \param tag Object tag to match
+	 * \returns Object IDs where Metadata::tag is equal to \c tag
+	 */
+	std::set<game_object_id_t> get_objects_by_tag(const std::string & tag) const;
 
 private:
+	//! By Component \c std::type_index (readability helper type)
+	template <typename T>
+	using by_type = std::unordered_map<std::type_index, T>;
+	//! By \c game_object_id index (readability helper type)
+	template <typename T>
+	using by_id_index = std::vector<T>;
 	/**
 	 * \brief The components
 	 *
@@ -146,8 +216,7 @@ private:
 	 * The first vector is for the ids of the GameObjects and the second vector is for the
 	 * components (because a GameObject might have multiple components).
 	 */
-	std::unordered_map<std::type_index, std::vector<std::vector<std::unique_ptr<Component>>>>
-		components;
+	by_type<by_id_index<std::vector<std::unique_ptr<Component>>>> components;
 
 	//! Persistent flag for each GameObject
 	std::unordered_map<game_object_id_t, bool> persistent;
diff --git a/src/crepe/manager/ComponentManager.hpp b/src/crepe/manager/ComponentManager.hpp
index ffb38ec..9e70865 100644
--- a/src/crepe/manager/ComponentManager.hpp
+++ b/src/crepe/manager/ComponentManager.hpp
@@ -95,32 +95,25 @@ template <typename T>
 RefVector<T> ComponentManager::get_components_by_id(game_object_id_t id) const {
 	using namespace std;
 
-	// Determine the type of T (this is used as the key of the unordered_map<>)
-	type_index type = typeid(T);
-
-	// Create an empty vector<>
-	RefVector<T> component_vector;
-
-	if (this->components.find(type) == this->components.end()) return component_vector;
-
-	// Get the correct vector<>
-	const vector<vector<unique_ptr<Component>>> & component_array = this->components.at(type);
-
-	// Make sure that the id (that we are looking for) is within the boundaries of the vector<>
-	if (id >= component_array.size()) return component_vector;
-
-	// Loop trough the whole vector<>
-	for (const unique_ptr<Component> & component_ptr : component_array[id]) {
-		// Cast the unique_ptr to a raw pointer
-		T * casted_component = static_cast<T *>(component_ptr.get());
-
-		if (casted_component == nullptr) continue;
+	static_assert(is_base_of<Component, T>::value,
+				  "get_components_by_id must recieve a derivative class of Component");
 
-		// Add the dereferenced raw pointer to the vector<>
-		component_vector.push_back(*casted_component);
+	type_index type = typeid(T);
+	if (!this->components.contains(type)) return {};
+
+	const by_id_index<vector<unique_ptr<Component>>> & components_by_id
+		= this->components.at(type);
+	if (id >= components_by_id.size()) return {};
+
+	RefVector<T> out = {};
+	const vector<unique_ptr<Component>> & components = components_by_id.at(id);
+	for (auto & component_ptr : components) {
+		if (component_ptr == nullptr) continue;
+		Component & component = *component_ptr.get();
+		out.push_back(static_cast<T &>(component));
 	}
 
-	return component_vector;
+	return out;
 }
 
 template <typename T>
@@ -158,4 +151,46 @@ RefVector<T> ComponentManager::get_components_by_type() const {
 	return component_vector;
 }
 
+template <typename T>
+std::set<game_object_id_t>
+ComponentManager::get_objects_by_predicate(const std::function<bool(const T &)> & pred) const {
+	using namespace std;
+
+	set<game_object_id_t> objects = {};
+	RefVector<T> components = this->get_components_by_type<T>();
+
+	for (const T & component : components) {
+		game_object_id_t id = dynamic_cast<const Component &>(component).game_object_id;
+		if (objects.contains(id)) continue;
+		if (!pred(component)) continue;
+		objects.insert(id);
+	}
+
+	return objects;
+}
+
+template <typename T>
+RefVector<T>
+ComponentManager::get_components_by_ids(const std::set<game_object_id_t> & ids) const {
+	using namespace std;
+
+	RefVector<T> out = {};
+	for (game_object_id_t id : ids) {
+		RefVector<T> components = get_components_by_id<T>(id);
+		out.insert(out.end(), components.begin(), components.end());
+	}
+
+	return out;
+}
+
+template <typename T>
+RefVector<T> ComponentManager::get_components_by_name(const std::string & name) const {
+	return this->get_components_by_ids<T>(this->get_objects_by_name(name));
+}
+
+template <typename T>
+RefVector<T> ComponentManager::get_components_by_tag(const std::string & tag) const {
+	return this->get_components_by_ids<T>(this->get_objects_by_tag(tag));
+}
+
 } // namespace crepe
diff --git a/src/crepe/manager/EventManager.cpp b/src/crepe/manager/EventManager.cpp
index 20f0dd3..6aa49ee 100644
--- a/src/crepe/manager/EventManager.cpp
+++ b/src/crepe/manager/EventManager.cpp
@@ -3,11 +3,9 @@
 using namespace crepe;
 using namespace std;
 
-EventManager & EventManager::get_instance() {
-	static EventManager instance;
-	return instance;
+EventManager::EventManager(Mediator & mediator) : Manager(mediator) {
+	this->mediator.event_manager = *this;
 }
-
 void EventManager::dispatch_events() {
 	for (auto & event : this->events_queue) {
 		this->handle_event(event.type, event.channel, *event.event.get());
diff --git a/src/crepe/manager/EventManager.h b/src/crepe/manager/EventManager.h
index ba5e98b..639e37f 100644
--- a/src/crepe/manager/EventManager.h
+++ b/src/crepe/manager/EventManager.h
@@ -8,6 +8,8 @@
 #include "../api/Event.h"
 #include "../api/EventHandler.h"
 
+#include "Manager.h"
+
 namespace crepe {
 
 //! Event listener unique ID
@@ -22,27 +24,19 @@ typedef size_t subscription_t;
 typedef size_t event_channel_t;
 
 /**
- * \class EventManager
  * \brief Manages event subscriptions, triggers, and queues, enabling decoupled event handling.
  *
  * The `EventManager` acts as a centralized event system. It allows for registering callbacks
  * for specific event types, triggering events synchronously, queueing events for later
  * processing, and managing subscriptions via unique identifiers.
  */
-class EventManager {
+class EventManager : public Manager {
 public:
 	static constexpr const event_channel_t CHANNEL_ALL = -1;
-
 	/**
-	 * \brief Get the singleton instance of the EventManager.
-	 *
-	 * This method returns the unique instance of the EventManager, creating it if it
-	 * doesn't already exist. Ensures only one instance is active in the program.
-	 *
-	 * \return Reference to the singleton instance of the EventManager.
+	 * \param mediator A reference to a Mediator object used for transfering managers.
 	 */
-	static EventManager & get_instance();
-
+	EventManager(Mediator & mediator);
 	/**
 	 * \brief Subscribe to a specific event type.
 	 *
@@ -108,13 +102,6 @@ public:
 
 private:
 	/**
-	 * \brief Default constructor for the EventManager.
-	 *
-	 * Constructor is private to enforce the singleton pattern.
-	 */
-	EventManager() = default;
-
-	/**
 	 * \struct QueueEntry
 	 * \brief Represents an entry in the event queue.
 	 */
diff --git a/src/crepe/manager/LoopTimerManager.cpp b/src/crepe/manager/LoopTimerManager.cpp
new file mode 100644
index 0000000..9819632
--- /dev/null
+++ b/src/crepe/manager/LoopTimerManager.cpp
@@ -0,0 +1,91 @@
+#include <chrono>
+#include <thread>
+
+#include "../util/Log.h"
+
+#include "LoopTimerManager.h"
+
+using namespace crepe;
+using namespace std::chrono;
+using namespace std::chrono_literals;
+
+LoopTimerManager::LoopTimerManager(Mediator & mediator) : Manager(mediator) {
+	this->mediator.loop_timer = *this;
+	dbg_trace();
+}
+
+void LoopTimerManager::start() {
+	this->last_frame_time = std::chrono::steady_clock::now();
+
+	this->elapsed_time = elapsed_time_t{0};
+	this->elapsed_fixed_time = elapsed_time_t{0};
+	this->delta_time = duration_t{0};
+}
+
+void LoopTimerManager::update() {
+	time_point_t current_frame_time = std::chrono::steady_clock::now();
+	// Convert to duration in seconds for delta time
+	this->delta_time = current_frame_time - last_frame_time;
+
+	if (this->delta_time > this->maximum_delta_time) {
+		this->delta_time = this->maximum_delta_time;
+	}
+	if (this->delta_time > 0s) {
+		this->actual_fps = 1.0 / duration_cast<seconds>(this->delta_time).count();
+	} else {
+		this->actual_fps = 0;
+	}
+	this->elapsed_time += duration_cast<elapsed_time_t>(this->delta_time);
+	this->last_frame_time = current_frame_time;
+}
+
+duration_t LoopTimerManager::get_delta_time() const {
+	return this->delta_time * this->time_scale;
+}
+
+elapsed_time_t LoopTimerManager::get_elapsed_time() const { return this->elapsed_time; }
+
+void LoopTimerManager::advance_fixed_elapsed_time() {
+	this->elapsed_fixed_time
+		+= std::chrono::duration_cast<elapsed_time_t>(this->fixed_delta_time);
+}
+
+void LoopTimerManager::set_target_framerate(unsigned fps) {
+	this->target_fps = fps;
+	//check if fps is lower or equals 0
+	if (fps <= 0) return;
+	// target time per frame in seconds
+	this->frame_target_time = duration_t(1s) / this->target_fps;
+}
+
+unsigned LoopTimerManager::get_fps() const { return this->actual_fps; }
+
+void LoopTimerManager::set_time_scale(double value) { this->time_scale = value; }
+
+float LoopTimerManager::get_time_scale() const { return this->time_scale; }
+
+void LoopTimerManager::enforce_frame_rate() {
+	time_point_t current_frame_time = std::chrono::steady_clock::now();
+	duration_t frame_duration = current_frame_time - this->last_frame_time;
+	// Check if frame duration is less than the target frame time
+	if (frame_duration < this->frame_target_time) {
+		duration_t delay_time = this->frame_target_time - frame_duration;
+		if (delay_time > 0s) {
+			std::this_thread::sleep_for(delay_time);
+		}
+	}
+}
+
+duration_t LoopTimerManager::get_lag() const {
+	return this->elapsed_time - this->elapsed_fixed_time;
+}
+
+duration_t LoopTimerManager::get_scaled_fixed_delta_time() const {
+	return this->fixed_delta_time * this->time_scale;
+}
+
+void LoopTimerManager::set_fixed_delta_time(float seconds) {
+	this->fixed_delta_time = duration_t(seconds);
+}
+
+duration_t LoopTimerManager::get_fixed_delta_time() const { return this->fixed_delta_time; }
diff --git a/src/crepe/manager/LoopTimerManager.h b/src/crepe/manager/LoopTimerManager.h
new file mode 100644
index 0000000..91403e4
--- /dev/null
+++ b/src/crepe/manager/LoopTimerManager.h
@@ -0,0 +1,175 @@
+#pragma once
+
+#include <chrono>
+
+#include "Manager.h"
+
+namespace crepe {
+
+typedef std::chrono::duration<double> duration_t;
+typedef std::chrono::duration<unsigned long long, std::micro> elapsed_time_t;
+
+/**
+ * \brief Manages timing and frame rate for the game loop.
+ * 
+ * The LoopTimerManager class is responsible for calculating and managing timing functions 
+ * such as delta time, frames per second (FPS), fixed time steps, and time scaling. It ensures 
+ * consistent frame updates and supports game loop operations, such as handling fixed updates 
+ * for physics and other time-sensitive operations.
+ */
+class LoopTimerManager : public Manager {
+public:
+	/**
+	 * \param mediator A reference to a Mediator object used for transfering managers.
+	 */
+	LoopTimerManager(Mediator & mediator);
+	/**
+	 * \brief Get the current delta time for the current frame.
+	 *	
+	 * This value represents the estimated frame duration of the current frame.
+	 * This value can be used in the frame_update to convert pixel based values to time based values.
+	 * 
+	 * \return Delta time in seconds since the last frame.
+	 */
+	duration_t get_delta_time() const;
+
+	/**
+	 * \brief Get the current elapsed time (total time passed )
+	 *
+	 * \note The current game time may vary from real-world elapsed time. It is the cumulative
+	 * sum of each frame's delta time.
+	 *
+	 * \return Elapsed game time in seconds.
+	 */
+	elapsed_time_t get_elapsed_time() const;
+
+	/**
+	 * \brief Set the target frames per second (FPS).
+	 *
+	 * \param fps The desired frames rendered per second.
+	 */
+	void set_target_framerate(unsigned fps);
+
+	/**
+	 * \brief Get the current frames per second (FPS).
+	 *
+	 * \return Current FPS.
+	 */
+	unsigned get_fps() const;
+
+	/**
+	 * \brief Get the current time scale.
+	 *
+	 * \return The current time scale, where (0 = pause, < 1 = slow down, 1 = normal speed, > 1 = speed up).
+	 * up the game.
+	 */
+	float get_time_scale() const;
+
+	/**
+	 * \brief Set the time scale.
+	 *
+	 * time_scale is a value that changes the delta time that can be retrieved using get_delta_time function. 
+	 * 
+	 * \param time_scale The desired time scale (0 = pause, < 1 = slow down, 1 = normal speed, > 1 = speed up).
+	 */
+	void set_time_scale(double time_scale);
+
+	/**
+	 * \brief Get the fixed delta time in seconds without scaling by the time scale.
+	 *
+	 * This value is used in the LoopManager to determine how many times 
+	 * the fixed_update should be called within a given interval.
+	 *
+	 * \return The unscaled fixed delta time in seconds.
+	 */
+	duration_t get_fixed_delta_time() const;
+
+	/**
+	 * \brief Set the fixed_delta_time in seconds.
+	 * 
+	 * \param seconds fixed_delta_time in seconds.
+	 * 
+	 * The fixed_delta_time value is used to determine how many times per second the fixed_update and process_input functions are called.
+	 * 
+	 */
+	void set_fixed_delta_time(float seconds);
+
+	/**
+	 * \brief Retrieves the scaled fixed delta time in seconds.
+	 *
+	 * The scaled fixed delta time is the timing value used within the `fixed_update` function. 
+	 * It is adjusted by the time_scale to account for any changes in the simulation's 
+	 * speed.
+	 *
+	 * \return The fixed delta time, scaled by the current time scale, in seconds.
+	 */
+	duration_t get_scaled_fixed_delta_time() const;
+
+private:
+	//! Friend relation to use start,enforce_frame_rate,get_lag,update,advance_fixed_update.
+	friend class LoopManager;
+	/**
+	 * \brief Start the loop timer.
+	 *
+	 * Initializes the timer to begin tracking frame times.
+	 */
+	void start();
+	/**
+	 * \brief Enforce the frame rate limit.
+	 *
+	 * Ensures that the game loop does not exceed the target FPS by delaying frame updates as
+	 * necessary.
+	 */
+	void enforce_frame_rate();
+	/**
+	 * \brief Get the accumulated lag in the game loop.
+	 *
+	 * Lag represents the difference between the target frame time and the actual frame time,
+	 * useful for managing fixed update intervals.
+	 *
+	 * \return Accumulated lag in seconds.
+	 */
+	duration_t get_lag() const;
+
+	/**
+	 * \brief Update the timer to the current frame.
+	 *
+	 * Calculates and updates the delta time for the current frame and adds it to the cumulative
+	 * game time.
+	 */
+	void update();
+
+	/**
+	 * \brief Progress the elapsed fixed time by the fixed delta time interval.
+	 *
+	 * This method advances the game's fixed update loop by adding the fixed_delta_time 
+	 * to elapsed_fixed_time, ensuring the fixed update catches up with the elapsed time.
+	 */
+	void advance_fixed_elapsed_time();
+
+private:
+	//! Target frames per second.
+	unsigned target_fps = 60;
+	//! Actual frames per second.
+	unsigned actual_fps = 0;
+	//! Time scale for speeding up or slowing down the game (0 = pause, < 1 = slow down, 1 = normal speed, > 1 = speed up).
+	float time_scale = 1;
+	//! Maximum delta time in seconds to avoid large jumps.
+	duration_t maximum_delta_time{0.25};
+	//! Delta time for the current frame in seconds.
+	duration_t delta_time{0.0};
+	//! Target time per frame in seconds
+	duration_t frame_target_time{1.0 / target_fps};
+	//! Fixed delta time for fixed updates in seconds.
+	duration_t fixed_delta_time{1.0 / 50.0};
+	//! Total elapsed game time in microseconds.
+	elapsed_time_t elapsed_time{0};
+	//! Total elapsed time for fixed updates in microseconds.
+	elapsed_time_t elapsed_fixed_time{0};
+
+	typedef std::chrono::steady_clock::time_point time_point_t;
+	//! Time of the last frame.
+	time_point_t last_frame_time;
+};
+
+} // namespace crepe
diff --git a/src/crepe/manager/Mediator.h b/src/crepe/manager/Mediator.h
index 8094d80..a336410 100644
--- a/src/crepe/manager/Mediator.h
+++ b/src/crepe/manager/Mediator.h
@@ -2,16 +2,15 @@
 
 #include "../util/OptionalRef.h"
 
-// TODO: remove these singletons:
-#include "../facade/SDLContext.h"
-#include "EventManager.h"
-#include "SaveManager.h"
-#include "api/LoopTimer.h"
-
 namespace crepe {
 
 class ComponentManager;
 class SceneManager;
+class EventManager;
+class LoopTimerManager;
+class SaveManager;
+class ResourceManager;
+class SDLContext;
 
 /**
  * Struct to pass references to classes that would otherwise need to be singletons down to
@@ -26,12 +25,13 @@ class SceneManager;
  * \warning This class should never be directly accessible from the API
  */
 struct Mediator {
+	OptionalRef<SDLContext> sdl_context;
 	OptionalRef<ComponentManager> component_manager;
 	OptionalRef<SceneManager> scene_manager;
-	OptionalRef<SaveManager> save_manager = SaveManager::get_instance();
-	OptionalRef<EventManager> event_manager = EventManager::get_instance();
-	OptionalRef<SDLContext> sdl_context = SDLContext::get_instance();
-	OptionalRef<LoopTimer> timer = LoopTimer::get_instance();
+	OptionalRef<EventManager> event_manager;
+	OptionalRef<LoopTimerManager> loop_timer;
+	OptionalRef<SaveManager> save_manager;
+	OptionalRef<ResourceManager> resource_manager;
 };
 
 } // namespace crepe
diff --git a/src/crepe/manager/ResourceManager.cpp b/src/crepe/manager/ResourceManager.cpp
new file mode 100644
index 0000000..a141a46
--- /dev/null
+++ b/src/crepe/manager/ResourceManager.cpp
@@ -0,0 +1,30 @@
+#include "util/Log.h"
+
+#include "ResourceManager.h"
+
+using namespace crepe;
+using namespace std;
+
+ResourceManager::ResourceManager(Mediator & mediator) : Manager(mediator) {
+	dbg_trace();
+	mediator.resource_manager = *this;
+}
+ResourceManager::~ResourceManager() { dbg_trace(); }
+
+void ResourceManager::clear() {
+	std::erase_if(this->resources, [](const pair<const Asset, CacheEntry> & pair) {
+		const CacheEntry & entry = pair.second;
+		return entry.persistent == false;
+	});
+}
+
+void ResourceManager::clear_all() { this->resources.clear(); }
+
+void ResourceManager::set_persistent(const Asset & asset, bool persistent) {
+	this->get_entry(asset).persistent = persistent;
+}
+
+ResourceManager::CacheEntry & ResourceManager::get_entry(const Asset & asset) {
+	if (!this->resources.contains(asset)) this->resources[asset] = {};
+	return this->resources.at(asset);
+}
diff --git a/src/crepe/manager/ResourceManager.h b/src/crepe/manager/ResourceManager.h
new file mode 100644
index 0000000..84b275d
--- /dev/null
+++ b/src/crepe/manager/ResourceManager.h
@@ -0,0 +1,78 @@
+#pragma once
+
+#include <memory>
+#include <unordered_map>
+
+#include "../Resource.h"
+#include "../api/Asset.h"
+
+#include "Manager.h"
+
+namespace crepe {
+
+/**
+ * \brief Owner of concrete Resource instances
+ * 
+ * ResourceManager caches concrete Resource instances per Asset. Concrete resources are
+ * destroyed at the end of scenes by default, unless the game programmer marks them as
+ * persistent.
+ */
+class ResourceManager : public Manager {
+public:
+	ResourceManager(Mediator & mediator);
+	virtual ~ResourceManager(); // dbg_trace
+
+private:
+	//! Cache entry
+	struct CacheEntry {
+		//! Concrete resource instance
+		std::unique_ptr<Resource> resource = nullptr;
+		//! Prevent ResourceManager::clear from removing this entry
+		bool persistent = false;
+	};
+	//! Internal cache
+	std::unordered_map<const Asset, CacheEntry> resources;
+	/**
+	 * \brief Ensure a cache entry exists for this asset and return a mutable reference to it
+	 *
+	 * \param asset Asset the concrete resource is instantiated from
+	 *
+	 * \returns Mutable reference to cache entry
+	 */
+	CacheEntry & get_entry(const Asset & asset);
+
+public:
+	/**
+	 * \brief Mark a resource as persistent (i.e. used across multiple scenes)
+	 *
+	 * \param asset Asset the concrete resource is instantiated from
+	 * \param persistent Whether this resource is persistent (true=keep, false=destroy)
+	 */
+	void set_persistent(const Asset & asset, bool persistent);
+
+	/**
+	 * \brief Retrieve reference to concrete Resource by Asset
+	 *
+	 * \param asset Asset the concrete resource is instantiated from
+	 * \tparam Resource Concrete derivative of Resource
+	 *
+	 * This class instantiates the concrete resource if it is not yet stored in the internal
+	 * cache, or returns a reference to the cached resource if it already exists.
+	 *
+	 * \returns Reference to concrete resource
+	 *
+	 * \throws std::runtime_error if the \c Resource parameter does not match with the actual
+	 * type of the resource stored in the cache for this Asset
+	 */
+	template <typename Resource>
+	Resource & get(const Asset & asset);
+
+	//! Clear non-persistent resources from cache
+	void clear();
+	//! Clear all resources from cache regardless of persistence
+	void clear_all();
+};
+
+} // namespace crepe
+
+#include "ResourceManager.hpp"
diff --git a/src/crepe/manager/ResourceManager.hpp b/src/crepe/manager/ResourceManager.hpp
new file mode 100644
index 0000000..cf5c949
--- /dev/null
+++ b/src/crepe/manager/ResourceManager.hpp
@@ -0,0 +1,27 @@
+#pragma once
+
+#include <format>
+
+#include "ResourceManager.h"
+
+namespace crepe {
+
+template <typename T>
+T & ResourceManager::get(const Asset & asset) {
+	using namespace std;
+	static_assert(is_base_of<Resource, T>::value,
+				  "cache must recieve a derivative class of Resource");
+
+	CacheEntry & entry = this->get_entry(asset);
+	if (entry.resource == nullptr) entry.resource = make_unique<T>(asset, this->mediator);
+
+	T * concrete_resource = dynamic_cast<T *>(entry.resource.get());
+	if (concrete_resource == nullptr)
+		throw runtime_error(format("ResourceManager: mismatch between requested type and "
+								   "actual type of resource ({})",
+								   asset.get_path()));
+
+	return *concrete_resource;
+}
+
+} // namespace crepe
diff --git a/src/crepe/manager/SaveManager.cpp b/src/crepe/manager/SaveManager.cpp
index d4ed1c1..691ea2f 100644
--- a/src/crepe/manager/SaveManager.cpp
+++ b/src/crepe/manager/SaveManager.cpp
@@ -1,13 +1,25 @@
 #include "../ValueBroker.h"
 #include "../api/Config.h"
 #include "../facade/DB.h"
-#include "../util/Log.h"
 
 #include "SaveManager.h"
 
 using namespace std;
 using namespace crepe;
 
+SaveManager::SaveManager(Mediator & mediator) : Manager(mediator) {
+	mediator.save_manager = *this;
+}
+
+DB & SaveManager::get_db() {
+	if (this->db == nullptr) {
+		Config & cfg = Config::get_instance();
+		this->db
+			= {new DB(cfg.savemgr.location), [](void * db) { delete static_cast<DB *>(db); }};
+	}
+	return *static_cast<DB *>(this->db.get());
+}
+
 template <>
 string SaveManager::serialize(const string & value) const noexcept {
 	return value;
@@ -90,22 +102,6 @@ int32_t SaveManager::deserialize(const string & value) const noexcept {
 	return deserialize<int64_t>(value);
 }
 
-SaveManager::SaveManager() { dbg_trace(); }
-
-SaveManager & SaveManager::get_instance() {
-	dbg_trace();
-	static SaveManager instance;
-	return instance;
-}
-
-DB & SaveManager::get_db() {
-	Config & cfg = Config::get_instance();
-	// TODO: make this path relative to XDG_DATA_HOME on Linux and whatever the
-	// default equivalent is on Windows using some third party library
-	static DB db(cfg.savemgr.location);
-	return db;
-}
-
 bool SaveManager::has(const string & key) {
 	DB & db = this->get_db();
 	return db.has(key);
@@ -155,7 +151,8 @@ ValueBroker<T> SaveManager::get(const string & key) {
 	return {
 		[this, key](const T & target) { this->set<T>(key, target); },
 		[this, key, value]() mutable -> const T & {
-			value = this->deserialize<T>(this->get_db().get(key));
+			DB & db = this->get_db();
+			value = this->deserialize<T>(db.get(key));
 			return value;
 		},
 	};
diff --git a/src/crepe/manager/SaveManager.h b/src/crepe/manager/SaveManager.h
index 3d8c852..61a978d 100644
--- a/src/crepe/manager/SaveManager.h
+++ b/src/crepe/manager/SaveManager.h
@@ -1,9 +1,12 @@
 #pragma once
 
+#include <functional>
 #include <memory>
 
 #include "../ValueBroker.h"
 
+#include "Manager.h"
+
 namespace crepe {
 
 class DB;
@@ -18,7 +21,7 @@ class DB;
  *
  * The underlying database is a key-value store.
  */
-class SaveManager {
+class SaveManager : public Manager {
 public:
 	/**
 	 * \brief Get a read/write reference to a value and initialize it if it does not yet exist
@@ -63,8 +66,8 @@ public:
 	 */
 	bool has(const std::string & key);
 
-private:
-	SaveManager();
+public:
+	SaveManager(Mediator & mediator);
 	virtual ~SaveManager() = default;
 
 private:
@@ -89,26 +92,13 @@ private:
 	template <typename T>
 	T deserialize(const std::string & value) const noexcept;
 
-public:
-	// singleton
-	static SaveManager & get_instance();
-	SaveManager(const SaveManager &) = delete;
-	SaveManager(SaveManager &&) = delete;
-	SaveManager & operator=(const SaveManager &) = delete;
-	SaveManager & operator=(SaveManager &&) = delete;
+protected:
+	//! Create or return DB
+	virtual DB & get_db();
 
 private:
-	/**
-	 * \brief Create an instance of DB and return its reference
-	 *
-	 * \returns DB instance
-	 *
-	 * This function exists because DB is a facade class, which can't directly be used in the API
-	 * without workarounds
-	 *
-	 * TODO: better solution
-	 */
-	static DB & get_db();
+	//! Database
+	std::unique_ptr<void, std::function<void(void *)>> db = nullptr;
 };
 
 } // namespace crepe
diff --git a/src/crepe/manager/SceneManager.cpp b/src/crepe/manager/SceneManager.cpp
index 50a9fbb..d4ca90b 100644
--- a/src/crepe/manager/SceneManager.cpp
+++ b/src/crepe/manager/SceneManager.cpp
@@ -32,4 +32,7 @@ void SceneManager::load_next_scene() {
 
 	// Load the new scene
 	scene->load_scene();
+
+	//clear the next scene
+	next_scene.clear();
 }
diff --git a/src/crepe/system/AISystem.cpp b/src/crepe/system/AISystem.cpp
new file mode 100644
index 0000000..d231c7c
--- /dev/null
+++ b/src/crepe/system/AISystem.cpp
@@ -0,0 +1,188 @@
+#include <algorithm>
+#include <cmath>
+
+#include "manager/ComponentManager.h"
+#include "manager/LoopTimerManager.h"
+#include "manager/Mediator.h"
+
+#include "AISystem.h"
+
+using namespace crepe;
+using namespace std::chrono;
+
+void AISystem::update() {
+	const Mediator & mediator = this->mediator;
+	ComponentManager & mgr = mediator.component_manager;
+	LoopTimerManager & timer = mediator.loop_timer;
+	RefVector<AI> ai_components = mgr.get_components_by_type<AI>();
+	LoopTimerManager & loop_timer = mediator.loop_timer;
+
+	//TODO: Use fixed loop dt (this is not available at master at the moment)
+	duration_t dt = loop_timer.get_delta_time();
+
+	// Loop through all AI components
+	for (AI & ai : ai_components) {
+		if (!ai.active) {
+			continue;
+		}
+
+		RefVector<Rigidbody> rigidbodies
+			= mgr.get_components_by_id<Rigidbody>(ai.game_object_id);
+		if (rigidbodies.empty()) {
+			throw std::runtime_error(
+				"AI component must be attached to a GameObject with a Rigidbody component");
+		}
+		Rigidbody & rigidbody = rigidbodies.front().get();
+		if (!rigidbody.active) {
+			continue;
+		}
+		if (rigidbody.data.mass <= 0) {
+			throw std::runtime_error("Mass must be greater than 0");
+		}
+
+		// Calculate the force to apply to the entity
+		vec2 force = this->calculate(ai, rigidbody);
+		// Calculate the acceleration (using the above calculated force)
+		vec2 acceleration = force / rigidbody.data.mass;
+		// Finally, update Rigidbody's velocity
+		rigidbody.data.linear_velocity += acceleration * duration_cast<seconds>(dt).count();
+	}
+}
+
+vec2 AISystem::calculate(AI & ai, const Rigidbody & rigidbody) {
+	const Mediator & mediator = this->mediator;
+	ComponentManager & mgr = mediator.component_manager;
+	RefVector<Transform> transforms = mgr.get_components_by_id<Transform>(ai.game_object_id);
+	Transform & transform = transforms.front().get();
+
+	vec2 force;
+
+	// Run all the behaviors that are on, and stop if the force gets too high
+	if (ai.on(AI::BehaviorTypeMask::FLEE)) {
+		vec2 force_to_add = this->flee(ai, rigidbody, transform);
+
+		if (!this->accumulate_force(ai, force, force_to_add)) {
+			return force;
+		}
+	}
+	if (ai.on(AI::BehaviorTypeMask::ARRIVE)) {
+		vec2 force_to_add = this->arrive(ai, rigidbody, transform);
+
+		if (!this->accumulate_force(ai, force, force_to_add)) {
+			return force;
+		}
+	}
+	if (ai.on(AI::BehaviorTypeMask::SEEK)) {
+		vec2 force_to_add = this->seek(ai, rigidbody, transform);
+
+		if (!this->accumulate_force(ai, force, force_to_add)) {
+			return force;
+		}
+	}
+	if (ai.on(AI::BehaviorTypeMask::PATH_FOLLOW)) {
+		vec2 force_to_add = this->path_follow(ai, rigidbody, transform);
+
+		if (!this->accumulate_force(ai, force, force_to_add)) {
+			return force;
+		}
+	}
+
+	return force;
+}
+
+bool AISystem::accumulate_force(const AI & ai, vec2 & running_total, vec2 & force_to_add) {
+	float magnitude = running_total.length();
+	float magnitude_remaining = ai.max_force - magnitude;
+
+	if (magnitude_remaining <= 0.0f) {
+		// If the force is already at/above the max force, return false
+		return false;
+	}
+
+	float magnitude_to_add = force_to_add.length();
+	if (magnitude_to_add < magnitude_remaining) {
+		// If the force to add is less than the remaining force, add it
+		running_total += force_to_add;
+	} else {
+		// If the force to add is greater than the remaining force, add a fraction of it
+		force_to_add.normalize();
+		running_total += force_to_add * magnitude_remaining;
+	}
+
+	return true;
+}
+
+vec2 AISystem::seek(const AI & ai, const Rigidbody & rigidbody,
+					const Transform & transform) const {
+	// Calculate the desired velocity
+	vec2 desired_velocity = ai.seek_target - transform.position;
+	desired_velocity.normalize();
+	desired_velocity *= rigidbody.data.max_linear_velocity;
+
+	return desired_velocity - rigidbody.data.linear_velocity;
+}
+
+vec2 AISystem::flee(const AI & ai, const Rigidbody & rigidbody,
+					const Transform & transform) const {
+	// Calculate the desired velocity if the entity is within the panic distance
+	vec2 desired_velocity = transform.position - ai.flee_target;
+	if (desired_velocity.length_squared() > ai.square_flee_panic_distance) {
+		return vec2{0, 0};
+	}
+	desired_velocity.normalize();
+	desired_velocity *= rigidbody.data.max_linear_velocity;
+
+	return desired_velocity - rigidbody.data.linear_velocity;
+}
+
+vec2 AISystem::arrive(const AI & ai, const Rigidbody & rigidbody,
+					  const Transform & transform) const {
+	// Calculate the desired velocity (taking into account the deceleration rate)
+	vec2 to_target = ai.arrive_target - transform.position;
+	float distance = to_target.length();
+	if (distance > 0.0f) {
+		if (ai.arrive_deceleration <= 0.0f) {
+			throw std::runtime_error("Deceleration rate must be greater than 0");
+		}
+
+		float speed = distance / ai.arrive_deceleration;
+		speed = std::min(speed, rigidbody.data.max_linear_velocity.length());
+		vec2 desired_velocity = to_target * (speed / distance);
+
+		return desired_velocity - rigidbody.data.linear_velocity;
+	}
+
+	return vec2{0, 0};
+}
+
+vec2 AISystem::path_follow(AI & ai, const Rigidbody & rigidbody, const Transform & transform) {
+	if (ai.path.empty()) {
+		return vec2{0, 0};
+	}
+
+	// Get the target node
+	vec2 target = ai.path.at(ai.path_index);
+	// Calculate the force to apply to the entity
+	vec2 to_target = target - transform.position;
+	if (to_target.length_squared() > ai.path_node_distance * ai.path_node_distance) {
+		// If the entity is not close enough to the target node, seek it
+		ai.seek_target = target;
+		ai.arrive_target = target;
+	} else {
+		// If the entity is close enough to the target node, move to the next node
+		ai.path_index++;
+		if (ai.path_index >= ai.path.size()) {
+			if (ai.path_loop) {
+				// If the path is looping, reset the path index
+				ai.path_index = 0;
+			} else {
+				// If the path is not looping, arrive at the last node
+				ai.path_index = ai.path.size() - 1;
+				return this->arrive(ai, rigidbody, transform);
+			}
+		}
+	}
+
+	// Seek the target node
+	return this->seek(ai, rigidbody, transform);
+}
diff --git a/src/crepe/system/AISystem.h b/src/crepe/system/AISystem.h
new file mode 100644
index 0000000..d5f8a8e
--- /dev/null
+++ b/src/crepe/system/AISystem.h
@@ -0,0 +1,81 @@
+#pragma once
+
+#include "api/AI.h"
+#include "api/Rigidbody.h"
+
+#include "System.h"
+#include "api/Transform.h"
+#include "types.h"
+
+namespace crepe {
+
+/**
+ * \brief The AISystem is used to control the movement of entities using AI.
+ *
+ * The AISystem is used to control the movement of entities using AI. The AISystem can be used to
+ * implement different behaviors such as seeking, fleeing, arriving, and path following.
+ */
+class AISystem : public System {
+public:
+	using System::System;
+
+	//! Update the AI system
+	void update() override;
+
+private:
+	/**
+	 * \brief Calculate the total force to apply to the entity
+	 *
+	 * \param ai The AI component
+	 * \param rigidbody The Rigidbody component
+	 */
+	vec2 calculate(AI & ai, const Rigidbody & rigidbody);
+	/**
+	 * \brief Accumulate the force to apply to the entity
+	 *
+	 * \param ai The AI component
+	 * \param running_total The running total of the force
+	 * \param force_to_add The force to add
+	 * \return true if the force was added, false otherwise
+	 */
+	bool accumulate_force(const AI & ai, vec2 & running_total, vec2 & force_to_add);
+
+	/**
+	 * \brief Calculate the seek force
+	 *
+	 * \param ai The AI component
+	 * \param rigidbody The Rigidbody component
+	 * \param transform The Transform component
+	 * \return The seek force
+	 */
+	vec2 seek(const AI & ai, const Rigidbody & rigidbody, const Transform & transform) const;
+	/**
+	 * \brief Calculate the flee force
+	 *
+	 * \param ai The AI component
+	 * \param rigidbody The Rigidbody component
+	 * \param transform The Transform component
+	 * \return The flee force
+	 */
+	vec2 flee(const AI & ai, const Rigidbody & rigidbody, const Transform & transform) const;
+	/**
+	 * \brief Calculate the arrive force
+	 *
+	 * \param ai The AI component
+	 * \param rigidbody The Rigidbody component
+	 * \param transform The Transform component
+	 * \return The arrive force
+	 */
+	vec2 arrive(const AI & ai, const Rigidbody & rigidbody, const Transform & transform) const;
+	/**
+	 * \brief Calculate the path follow force
+	 *
+	 * \param ai The AI component
+	 * \param rigidbody The Rigidbody component
+	 * \param transform The Transform component
+	 * \return The path follow force
+	 */
+	vec2 path_follow(AI & ai, const Rigidbody & rigidbody, const Transform & transform);
+};
+
+} // namespace crepe
diff --git a/src/crepe/system/AnimatorSystem.cpp b/src/crepe/system/AnimatorSystem.cpp
index 549c35d..31eb85c 100644
--- a/src/crepe/system/AnimatorSystem.cpp
+++ b/src/crepe/system/AnimatorSystem.cpp
@@ -2,7 +2,7 @@
 
 #include "../api/Animator.h"
 #include "../manager/ComponentManager.h"
-#include "api/LoopTimer.h"
+#include "../manager/LoopTimerManager.h"
 
 #include "AnimatorSystem.h"
 
@@ -10,10 +10,10 @@ using namespace crepe;
 
 void AnimatorSystem::update() {
 	ComponentManager & mgr = this->mediator.component_manager;
-	LoopTimer & timer = this->mediator.timer;
+	LoopTimerManager & timer = this->mediator.loop_timer;
 	RefVector<Animator> animations = mgr.get_components_by_type<Animator>();
 
-	double elapsed_time = timer.get_current_time();
+	unsigned long long elapsed_time = timer.get_elapsed_time().count();
 
 	for (Animator & a : animations) {
 		if (!a.active) continue;
@@ -23,7 +23,7 @@ void AnimatorSystem::update() {
 
 		int last_frame = ctx.row;
 
-		int cycle_end = (ctx.cycle_end == -1) ? a.max_rows : ctx.cycle_end;
+		int cycle_end = (ctx.cycle_end == -1) ? a.grid_size.x : ctx.cycle_end;
 		int total_frames = cycle_end - ctx.cycle_start;
 
 		int curr_frame = static_cast<int>(elapsed_time / frame_duration) % total_frames;
diff --git a/src/crepe/system/AudioSystem.cpp b/src/crepe/system/AudioSystem.cpp
new file mode 100644
index 0000000..b1aa0f8
--- /dev/null
+++ b/src/crepe/system/AudioSystem.cpp
@@ -0,0 +1,62 @@
+#include "AudioSystem.h"
+
+#include "../manager/ComponentManager.h"
+#include "../manager/ResourceManager.h"
+#include "../types.h"
+
+using namespace crepe;
+using namespace std;
+
+void AudioSystem::update() {
+	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 (AudioSource & component : components) {
+		Sound & resource = resource_manager.get<Sound>(component.source);
+
+		this->diff_update(component, resource);
+
+		this->update_last(component);
+	}
+}
+
+void AudioSystem::diff_update(AudioSource & component, Sound & resource) {
+	SoundContext & context = this->get_context();
+
+	if (component.active != component.last_active) {
+		if (!component.active) {
+			context.stop(component.voice);
+			return;
+		}
+		if (component.play_on_awake) component.oneshot_play = true;
+	}
+	if (!component.active) return;
+
+	if (component.oneshot_play) {
+		component.voice = context.play(resource);
+		component.oneshot_play = false;
+	}
+	if (component.oneshot_stop) {
+		context.stop(component.voice);
+		component.oneshot_stop = false;
+	}
+	if (component.volume != component.last_volume) {
+		context.set_volume(component.voice, component.volume);
+	}
+	if (component.loop != component.last_loop) {
+		context.set_loop(component.voice, component.loop);
+	}
+}
+
+void AudioSystem::update_last(AudioSource & component) {
+	component.last_active = component.active;
+	component.last_loop = component.loop;
+	component.last_volume = component.volume;
+}
+
+SoundContext & AudioSystem::get_context() {
+	if (this->context == nullptr) this->context = make_unique<SoundContext>();
+	return *this->context.get();
+}
diff --git a/src/crepe/system/AudioSystem.h b/src/crepe/system/AudioSystem.h
new file mode 100644
index 0000000..2ddc443
--- /dev/null
+++ b/src/crepe/system/AudioSystem.h
@@ -0,0 +1,51 @@
+#pragma once
+
+#include "../api/AudioSource.h"
+#include "../facade/Sound.h"
+#include "../facade/SoundContext.h"
+
+#include "System.h"
+
+namespace crepe {
+
+class AudioSystem : public System {
+public:
+	using System::System;
+	void update() override;
+
+private:
+	/**
+	 * \brief Update `last_*` members of \c component
+	 *
+	 * Copies all component properties stored for comparison between AudioSystem::update() calls
+	 *
+	 * \param component AudioSource component to update
+	 */
+	void update_last(AudioSource & component);
+
+	/**
+	 * \brief Compare update component
+	 *
+	 * Compares properties of \c component and \c data, and calls SoundContext functions where
+	 * applicable.
+	 *
+	 * \param component AudioSource component to update
+	 * \param resource Sound instance for AudioSource's Asset
+	 */
+	void diff_update(AudioSource & component, Sound & resource);
+
+protected:
+	/**
+	 * \brief Get SoundContext
+	 *
+	 * SoundContext is retrieved through this function instead of being a direct member of
+	 * AudioSystem to aid with testability.
+	 */
+	virtual SoundContext & get_context();
+
+private:
+	//! SoundContext
+	std::unique_ptr<SoundContext> context = nullptr;
+};
+
+} // namespace crepe
diff --git a/src/crepe/system/CMakeLists.txt b/src/crepe/system/CMakeLists.txt
index 95f6e33..0e2db76 100644
--- a/src/crepe/system/CMakeLists.txt
+++ b/src/crepe/system/CMakeLists.txt
@@ -5,8 +5,10 @@ target_sources(crepe PUBLIC
 	PhysicsSystem.cpp
 	CollisionSystem.cpp
 	RenderSystem.cpp
+	AudioSystem.cpp
 	AnimatorSystem.cpp
 	InputSystem.cpp
+	AISystem.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -15,6 +17,8 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	PhysicsSystem.h
 	CollisionSystem.h
 	RenderSystem.h
+	AudioSystem.h
 	AnimatorSystem.h
 	InputSystem.h
+	AISystem.h
 )
diff --git a/src/crepe/system/InputSystem.cpp b/src/crepe/system/InputSystem.cpp
index e76b1ec..459feb3 100644
--- a/src/crepe/system/InputSystem.cpp
+++ b/src/crepe/system/InputSystem.cpp
@@ -2,6 +2,9 @@
 #include "../api/Button.h"
 #include "../manager/ComponentManager.h"
 #include "../manager/EventManager.h"
+#include "facade/SDLContext.h"
+#include "util/Log.h"
+
 #include "InputSystem.h"
 
 using namespace crepe;
@@ -9,7 +12,8 @@ using namespace crepe;
 void InputSystem::update() {
 	ComponentManager & mgr = this->mediator.component_manager;
 	EventManager & event_mgr = this->mediator.event_manager;
-	std::vector<SDLContext::EventData> event_list = SDLContext::get_instance().get_events();
+	SDLContext & context = this->mediator.sdl_context;
+	std::vector<SDLContext::EventData> event_list = context.get_events();
 	RefVector<Button> buttons = mgr.get_components_by_type<Button>();
 	RefVector<Camera> cameras = mgr.get_components_by_type<Camera>();
 	OptionalRef<Camera> curr_cam_ref;
diff --git a/src/crepe/system/RenderSystem.cpp b/src/crepe/system/RenderSystem.cpp
index 26f2c85..afd9548 100644
--- a/src/crepe/system/RenderSystem.cpp
+++ b/src/crepe/system/RenderSystem.cpp
@@ -10,9 +10,12 @@
 #include "../api/Sprite.h"
 #include "../api/Transform.h"
 #include "../facade/SDLContext.h"
+#include "../facade/Texture.h"
 #include "../manager/ComponentManager.h"
+#include "../manager/ResourceManager.h"
 
 #include "RenderSystem.h"
+#include "types.h"
 
 using namespace crepe;
 using namespace std;
@@ -27,7 +30,7 @@ void RenderSystem::present_screen() {
 	ctx.present_screen();
 }
 
-SDLContext::CameraValues RenderSystem::update_camera() {
+void RenderSystem::update_camera() {
 	ComponentManager & mgr = this->mediator.component_manager;
 	SDLContext & ctx = this->mediator.sdl_context;
 	RefVector<Camera> cameras = mgr.get_components_by_type<Camera>();
@@ -38,9 +41,9 @@ SDLContext::CameraValues RenderSystem::update_camera() {
 		if (!cam.active) continue;
 		const Transform & transform
 			= mgr.get_components_by_id<Transform>(cam.game_object_id).front().get();
-		SDLContext::CameraValues cam_val = ctx.set_camera(cam);
-		cam_val.cam_pos = transform.position + cam.data.postion_offset;
-		return cam_val;
+		vec2 new_camera_pos = transform.position + cam.data.postion_offset;
+		ctx.update_camera_view(cam, new_camera_pos);
+		return;
 	}
 	throw std::runtime_error("No active cameras in current scene");
 }
@@ -67,11 +70,12 @@ void RenderSystem::update() {
 	this->present_screen();
 }
 
-bool RenderSystem::render_particle(const Sprite & sprite, const SDLContext::CameraValues & cam,
-								   const double & scale) {
+bool RenderSystem::render_particle(const Sprite & sprite, const double & scale) {
 
 	ComponentManager & mgr = this->mediator.component_manager;
 	SDLContext & ctx = this->mediator.sdl_context;
+	ResourceManager & resource_manager = this->mediator.resource_manager;
+	Texture & res = resource_manager.get<Texture>(sprite.source);
 
 	vector<reference_wrapper<ParticleEmitter>> emitters
 		= mgr.get_components_by_id<ParticleEmitter>(sprite.game_object_id);
@@ -88,7 +92,7 @@ bool RenderSystem::render_particle(const Sprite & sprite, const SDLContext::Came
 
 			ctx.draw(SDLContext::RenderContext{
 				.sprite = sprite,
-				.cam = cam,
+				.texture = res,
 				.pos = p.position,
 				.angle = p.angle,
 				.scale = scale,
@@ -97,12 +101,14 @@ bool RenderSystem::render_particle(const Sprite & sprite, const SDLContext::Came
 	}
 	return rendering_particles;
 }
-void RenderSystem::render_normal(const Sprite & sprite, const SDLContext::CameraValues & cam,
-								 const Transform & tm) {
+void RenderSystem::render_normal(const Sprite & sprite, const Transform & tm) {
 	SDLContext & ctx = this->mediator.sdl_context;
+	ResourceManager & resource_manager = this->mediator.resource_manager;
+	const Texture & res = resource_manager.get<Texture>(sprite.source);
+
 	ctx.draw(SDLContext::RenderContext{
 		.sprite = sprite,
-		.cam = cam,
+		.texture = res,
 		.pos = tm.position,
 		.angle = tm.rotation,
 		.scale = tm.scale,
@@ -111,7 +117,7 @@ void RenderSystem::render_normal(const Sprite & sprite, const SDLContext::Camera
 
 void RenderSystem::render() {
 	ComponentManager & mgr = this->mediator.component_manager;
-	const SDLContext::CameraValues & cam = this->update_camera();
+	this->update_camera();
 
 	RefVector<Sprite> sprites = mgr.get_components_by_type<Sprite>();
 	RefVector<Sprite> sorted_sprites = this->sort(sprites);
@@ -121,10 +127,10 @@ 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, cam, transform.scale);
+		bool rendered_particles = this->render_particle(sprite, transform.scale);
 
 		if (rendered_particles) continue;
 
-		this->render_normal(sprite, cam, transform);
+		this->render_normal(sprite, transform);
 	}
 }
diff --git a/src/crepe/system/RenderSystem.h b/src/crepe/system/RenderSystem.h
index e270a6b..fc7b46e 100644
--- a/src/crepe/system/RenderSystem.h
+++ b/src/crepe/system/RenderSystem.h
@@ -2,8 +2,6 @@
 
 #include <cmath>
 
-#include "facade/SDLContext.h"
-
 #include "System.h"
 #include "types.h"
 
@@ -14,7 +12,6 @@ class Sprite;
 class Transform;
 
 /**
- * \class RenderSystem
  * \brief Manages rendering operations for all game objects.
  *
  * RenderSystem is responsible for rendering, clearing and presenting the screen, and
@@ -37,7 +34,7 @@ private:
 	void present_screen();
 
 	//! Updates the active camera used for rendering.
-	SDLContext::CameraValues update_camera();
+	void update_camera();
 
 	//! Renders the whole screen
 	void render();
@@ -52,8 +49,7 @@ private:
 	 *  constructor is now protected i cannot make tmp inside
 	 * \return true if particles have been rendered
 	 */
-	bool render_particle(const Sprite & sprite, const SDLContext::CameraValues & cam,
-						 const double & scale);
+	bool render_particle(const Sprite & sprite, const double & scale);
 
 	/**
 	 * \brief renders a sprite with a Transform component on the screen
@@ -61,8 +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 SDLContext::CameraValues & cam,
-					   const Transform & tm);
+	void render_normal(const Sprite & sprite, const Transform & tm);
 
 	/**
 	 * \brief sort a vector sprite objects with
diff --git a/src/crepe/system/System.cpp b/src/crepe/system/System.cpp
index f68549b..ecc740d 100644
--- a/src/crepe/system/System.cpp
+++ b/src/crepe/system/System.cpp
@@ -1,7 +1,5 @@
-#include "../util/Log.h"
-
 #include "System.h"
 
 using namespace crepe;
 
-System::System(const Mediator & mediator) : mediator(mediator) { dbg_trace(); }
+System::System(const Mediator & mediator) : mediator(mediator) {}
diff --git a/src/crepe/util/OptionalRef.h b/src/crepe/util/OptionalRef.h
index 3201667..1b2cb3f 100644
--- a/src/crepe/util/OptionalRef.h
+++ b/src/crepe/util/OptionalRef.h
@@ -25,7 +25,7 @@ public:
 	 */
 	OptionalRef<T> & operator=(T & ref);
 	/**
-	 * \brief Retrieve this reference
+	 * \brief Retrieve this reference (cast)
 	 *
 	 * \returns Internal reference if it is set
 	 *
@@ -33,6 +33,14 @@ public:
 	 */
 	operator T &() const;
 	/**
+	 * \brief Retrieve this reference (member access)
+	 *
+	 * \returns Internal reference if it is set
+	 *
+	 * \throws std::runtime_error if this function is called while the reference it not set
+	 */
+	T * operator->() const;
+	/**
 	 * \brief Check if this reference is not empty
 	 *
 	 * \returns `true` if reference is set, or `false` if it is not
diff --git a/src/crepe/util/OptionalRef.hpp b/src/crepe/util/OptionalRef.hpp
index 4608c9e..5e36b3a 100644
--- a/src/crepe/util/OptionalRef.hpp
+++ b/src/crepe/util/OptionalRef.hpp
@@ -19,6 +19,13 @@ OptionalRef<T>::operator T &() const {
 }
 
 template <typename T>
+T * OptionalRef<T>::operator->() const {
+	if (this->ref == nullptr)
+		throw std::runtime_error("OptionalRef: attempt to dereference nullptr");
+	return this->ref;
+}
+
+template <typename T>
 OptionalRef<T> & OptionalRef<T>::operator=(T & ref) {
 	this->ref = &ref;
 	return *this;
diff --git a/src/example/AITest.cpp b/src/example/AITest.cpp
new file mode 100644
index 0000000..f4efc9f
--- /dev/null
+++ b/src/example/AITest.cpp
@@ -0,0 +1,86 @@
+#include <crepe/api/AI.h>
+#include <crepe/api/BehaviorScript.h>
+#include <crepe/api/Camera.h>
+#include <crepe/api/Color.h>
+#include <crepe/api/GameObject.h>
+#include <crepe/api/LoopManager.h>
+#include <crepe/api/Rigidbody.h>
+#include <crepe/api/Scene.h>
+#include <crepe/api/Script.h>
+#include <crepe/api/Sprite.h>
+#include <crepe/api/Texture.h>
+#include <crepe/manager/Mediator.h>
+#include <crepe/types.h>
+
+using namespace crepe;
+using namespace std;
+
+class Script1 : public Script {
+	bool shutdown(const ShutDownEvent & event) {
+		// Very dirty way of shutting down the game
+		throw "ShutDownEvent";
+		return true;
+	}
+
+	bool mousemove(const MouseMoveEvent & event) {
+		/*RefVector<AI> aivec = this->get_components<AI>();
+		AI & ai = aivec.front().get();
+		ai.flee_target
+			= vec2{static_cast<float>(event.mouse_x), static_cast<float>(event.mouse_y)};*/
+		return true;
+	}
+
+	void init() {
+		subscribe<ShutDownEvent>(
+			[this](const ShutDownEvent & ev) -> bool { return this->shutdown(ev); });
+		subscribe<MouseMoveEvent>(
+			[this](const MouseMoveEvent & ev) -> bool { return this->mousemove(ev); });
+	}
+};
+
+class Scene1 : public Scene {
+public:
+	void load_scene() override {
+		Mediator & mediator = this->mediator;
+		ComponentManager & mgr = mediator.component_manager;
+
+		GameObject game_object1 = mgr.new_object("", "", vec2{0, 0}, 0, 1);
+		GameObject game_object2 = mgr.new_object("", "", vec2{0, 0}, 0, 1);
+
+		Texture img = Texture("asset/texture/test_ap43.png");
+		game_object1.add_component<Sprite>(img, Sprite::Data{
+													.color = Color::MAGENTA,
+													.flip = Sprite::FlipSettings{false, false},
+													.sorting_in_layer = 1,
+													.order_in_layer = 1,
+													.size = {0, 195},
+												});
+		AI & ai = game_object1.add_component<AI>(3000);
+		// ai.arrive_on();
+		// ai.flee_on();
+		ai.path_follow_on();
+		ai.make_oval_path(500, 1000, {0, -1000}, 1.5708, true);
+		ai.make_oval_path(1000, 500, {0, 500}, 4.7124, false);
+		game_object1.add_component<Rigidbody>(Rigidbody::Data{
+			.mass = 0.1f,
+			.max_linear_velocity = {40, 40},
+		});
+		game_object1.add_component<BehaviorScript>().set_script<Script1>();
+
+		game_object2.add_component<Camera>(ivec2{1080, 720}, vec2{5000, 5000},
+										   Camera::Data{
+											   .bg_color = Color::WHITE,
+											   .zoom = 1,
+										   });
+	}
+
+	string get_name() const override { return "Scene1"; }
+};
+
+int main() {
+	LoopManager engine;
+	engine.add_scene<Scene1>();
+	engine.start();
+
+	return 0;
+}
diff --git a/src/example/CMakeLists.txt b/src/example/CMakeLists.txt
index 8ef71bb..187ed46 100644
--- a/src/example/CMakeLists.txt
+++ b/src/example/CMakeLists.txt
@@ -16,8 +16,7 @@ function(add_example target_name)
 	add_dependencies(examples ${target_name})
 endfunction()
 
-add_example(asset_manager)
-add_example(savemgr)
 add_example(rendering_particle)
 add_example(game)
 add_example(button)
+add_example(AITest)
diff --git a/src/example/asset_manager.cpp b/src/example/asset_manager.cpp
deleted file mode 100644
index 917b547..0000000
--- a/src/example/asset_manager.cpp
+++ /dev/null
@@ -1,36 +0,0 @@
-#include <crepe/api/AssetManager.h>
-#include <crepe/api/Texture.h>
-#include <crepe/facade/Sound.h>
-
-using namespace crepe;
-
-int main() {
-
-	// this needs to be called before the asset manager otherwise the destructor of sdl is not in
-	// the right order
-	{ Texture test("../asset/texture/img.png"); }
-	// FIXME: make it so the issue described by the above comment is not possible (i.e. the order
-	// in which internal classes are instantiated should not impact the way the engine works).
-
-	auto & mgr = AssetManager::get_instance();
-
-	{
-		// TODO: [design] the Sound class can't be directly included by the user as it includes
-		// SoLoud headers.
-		auto bgm = mgr.cache<Sound>("../mwe/audio/bgm.ogg");
-		auto sfx1 = mgr.cache<Sound>("../mwe/audio/sfx1.wav");
-		auto sfx2 = mgr.cache<Sound>("../mwe/audio/sfx2.wav");
-
-		auto img = mgr.cache<Texture>("../asset/texture/img.png");
-		auto img1 = mgr.cache<Texture>("../asset/texture/second.png");
-	}
-
-	{
-		auto bgm = mgr.cache<Sound>("../mwe/audio/bgm.ogg");
-		auto sfx1 = mgr.cache<Sound>("../mwe/audio/sfx1.wav");
-		auto sfx2 = mgr.cache<Sound>("../mwe/audio/sfx2.wav");
-
-		auto img = mgr.cache<Texture>("../asset/texture/img.png");
-		auto img1 = mgr.cache<Texture>("../asset/texture/second.png");
-	}
-}
diff --git a/src/example/rendering_particle.cpp b/src/example/rendering_particle.cpp
index 29d475d..13e625f 100644
--- a/src/example/rendering_particle.cpp
+++ b/src/example/rendering_particle.cpp
@@ -1,5 +1,7 @@
+#include "api/Asset.h"
 #include <crepe/Component.h>
 #include <crepe/api/Animator.h>
+#include <crepe/api/Button.h>
 #include <crepe/api/Camera.h>
 #include <crepe/api/Color.h>
 #include <crepe/api/GameObject.h>
@@ -7,11 +9,11 @@
 #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/manager/ComponentManager.h>
 #include <crepe/manager/Mediator.h>
 #include <crepe/types.h>
+#include <iostream>
 
 using namespace crepe;
 using namespace std;
@@ -41,13 +43,15 @@ using namespace std;
 class TestScene : public Scene {
 public:
 	void load_scene() {
+
+		cout << "TestScene" << endl;
 		Mediator & mediator = this->mediator;
 		ComponentManager & mgr = mediator.component_manager;
 		GameObject game_object = mgr.new_object("", "", vec2{0, 0}, 0, 1);
 
 		Color color(255, 255, 255, 255);
 
-		auto img = Texture("asset/spritesheet/pokemon_spritesheet.png");
+		Asset img{"asset/spritesheet/spritesheet_test.png"};
 
 		Sprite & test_sprite = game_object.add_component<Sprite>(
 			img, Sprite::Data{
@@ -57,21 +61,27 @@ public:
 					 .order_in_layer = 2,
 					 .size = {0, 100},
 					 .angle_offset = 0,
-					 .position_offset = {100, 0},
+					 .position_offset = {0, 0},
 				 });
 
-		auto & anim = game_object.add_component<Animator>(test_sprite, 4, 4,
-														  Animator::Data{
-															  .fps = 1,
-															  .looping = false,
-														  });
-		anim.set_anim(2);
-		anim.active = false;
+		//auto & anim = game_object.add_component<Animator>(test_sprite,ivec2{32, 64}, uvec2{4,1}, Animator::Data{});
+		//anim.set_anim(0);
 
-		auto & cam = game_object.add_component<Camera>(ivec2{1280, 720}, vec2{400, 400},
+		auto & cam = game_object.add_component<Camera>(ivec2{720, 1280}, vec2{400, 400},
 													   Camera::Data{
 														   .bg_color = Color::WHITE,
 													   });
+
+		function<void()> on_click = [&]() { cout << "button clicked" << std::endl; };
+		function<void()> on_enter = [&]() { cout << "enter" << std::endl; };
+		function<void()> on_exit = [&]() { cout << "exit" << std::endl; };
+
+		auto & button
+			= game_object.add_component<Button>(vec2{200, 200}, vec2{0, 0}, on_click, false);
+		button.on_mouse_enter = on_enter;
+		button.on_mouse_exit = on_exit;
+		button.is_toggle = true;
+		button.active = true;
 	}
 
 	string get_name() const { return "TestScene"; };
diff --git a/src/example/savemgr.cpp b/src/example/savemgr.cpp
deleted file mode 100644
index 65c4a34..0000000
--- a/src/example/savemgr.cpp
+++ /dev/null
@@ -1,44 +0,0 @@
-/** \file
- * 
- * Standalone example for usage of the save manager
- */
-
-#include <cassert>
-#include <crepe/api/Config.h>
-#include <crepe/api/SaveManager.h>
-#include <crepe/util/Log.h>
-#include <crepe/util/Proxy.h>
-
-using namespace crepe;
-
-// unrelated setup code
-int _ = []() {
-	// make sure all log messages get printed
-	auto & cfg = Config::get_instance();
-	cfg.log.level = Log::Level::TRACE;
-
-	return 0; // satisfy compiler
-}();
-
-int main() {
-	const char * key = "mygame.test";
-
-	SaveManager & mgr = SaveManager::get_instance();
-
-	dbg_logf("has key = {}", mgr.has(key));
-	ValueBroker<int> prop = mgr.get<int>(key, 0);
-	Proxy<int> val = mgr.get<int>(key, 0);
-
-	dbg_logf("val = {}", mgr.get<int>(key).get());
-	prop.set(1);
-	dbg_logf("val = {}", mgr.get<int>(key).get());
-	val = 2;
-	dbg_logf("val = {}", mgr.get<int>(key).get());
-	mgr.set<int>(key, 3);
-	dbg_logf("val = {}", mgr.get<int>(key).get());
-
-	dbg_logf("has key = {}", mgr.has(key));
-	assert(true == mgr.has(key));
-
-	return 0;
-}
diff --git a/src/test/AudioTest.cpp b/src/test/AudioTest.cpp
new file mode 100644
index 0000000..48bba1b
--- /dev/null
+++ b/src/test/AudioTest.cpp
@@ -0,0 +1,161 @@
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <crepe/api/AudioSource.h>
+#include <crepe/api/GameObject.h>
+#include <crepe/manager/ComponentManager.h>
+#include <crepe/manager/ResourceManager.h>
+#include <crepe/system/AudioSystem.h>
+
+using namespace std;
+using namespace std::chrono_literals;
+using namespace crepe;
+using namespace testing;
+
+class AudioTest : public Test {
+private:
+	class TestSoundContext : public SoundContext {
+	public:
+		MOCK_METHOD(SoundHandle, play, (Sound & resource), (override));
+		MOCK_METHOD(void, stop, (const SoundHandle &), (override));
+		MOCK_METHOD(void, set_volume, (const SoundHandle &, float), (override));
+		MOCK_METHOD(void, set_loop, (const SoundHandle &, bool), (override));
+	};
+
+	class TestAudioSystem : public AudioSystem {
+	public:
+		using AudioSystem::AudioSystem;
+		StrictMock<TestSoundContext> context;
+		virtual SoundContext & get_context() { return this->context; }
+	};
+
+private:
+	Mediator mediator;
+	ComponentManager component_manager{mediator};
+	ResourceManager resource_manager{mediator};
+
+public:
+	TestAudioSystem system{mediator};
+	TestSoundContext & context = system.context;
+
+private:
+	GameObject entity = component_manager.new_object("name");
+
+public:
+	AudioSource & component = entity.add_component<AudioSource>("mwe/audio/bgm.ogg");
+};
+
+TEST_F(AudioTest, Default) {
+	EXPECT_CALL(context, play(_)).Times(0);
+	EXPECT_CALL(context, stop(_)).Times(0);
+	EXPECT_CALL(context, set_volume(_, _)).Times(0);
+	EXPECT_CALL(context, set_loop(_, _)).Times(0);
+	system.update();
+}
+
+TEST_F(AudioTest, Play) {
+	system.update();
+
+	{
+		InSequence seq;
+
+		EXPECT_CALL(context, play(_)).Times(0);
+		component.play();
+	}
+
+	{
+		InSequence seq;
+
+		EXPECT_CALL(context, play(_)).Times(1);
+		system.update();
+	}
+}
+
+TEST_F(AudioTest, Stop) {
+	system.update();
+
+	{
+		InSequence seq;
+
+		EXPECT_CALL(context, stop(_)).Times(0);
+		component.stop();
+	}
+
+	{
+		InSequence seq;
+
+		EXPECT_CALL(context, stop(_)).Times(1);
+		system.update();
+	}
+}
+
+TEST_F(AudioTest, Volume) {
+	system.update();
+
+	{
+		InSequence seq;
+
+		EXPECT_CALL(context, set_volume(_, _)).Times(0);
+		component.volume += 0.2;
+	}
+
+	{
+		InSequence seq;
+
+		EXPECT_CALL(context, set_volume(_, component.volume)).Times(1);
+		system.update();
+	}
+}
+
+TEST_F(AudioTest, Looping) {
+	system.update();
+
+	{
+		InSequence seq;
+
+		EXPECT_CALL(context, set_loop(_, _)).Times(0);
+		component.loop = !component.loop;
+	}
+
+	{
+		InSequence seq;
+
+		EXPECT_CALL(context, set_loop(_, component.loop)).Times(1);
+		system.update();
+	}
+}
+
+TEST_F(AudioTest, StopOnDeactivate) {
+	system.update();
+
+	{
+		InSequence seq;
+
+		EXPECT_CALL(context, stop(_)).Times(1);
+		component.active = false;
+		system.update();
+	}
+}
+
+TEST_F(AudioTest, PlayOnActive) {
+	component.active = false;
+	component.play_on_awake = true;
+	system.update();
+
+	{
+		InSequence seq;
+
+		EXPECT_CALL(context, play(_)).Times(1);
+		component.active = true;
+		system.update();
+	}
+}
+
+TEST_F(AudioTest, PlayImmediately) {
+	component.play_on_awake = false;
+	component.play();
+
+	EXPECT_CALL(context, play(_)).Times(1);
+
+	system.update();
+}
diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
index c9cbac5..11b4ca9 100644
--- a/src/test/CMakeLists.txt
+++ b/src/test/CMakeLists.txt
@@ -4,7 +4,9 @@ target_sources(test_main PUBLIC
 	PhysicsTest.cpp
 	ScriptTest.cpp
 	ParticleTest.cpp
+	AudioTest.cpp
 	AssetTest.cpp
+	ResourceManagerTest.cpp
 	OptionalRefTest.cpp
 	RenderSystemTest.cpp
 	EventTest.cpp
@@ -13,8 +15,13 @@ target_sources(test_main PUBLIC
 	ValueBrokerTest.cpp
 	DBTest.cpp
 	Vector2Test.cpp
+	LoopManagerTest.cpp
+	LoopTimerTest.cpp
 	InputTest.cpp
 	ScriptEventTest.cpp
 	ScriptSceneTest.cpp
 	Profiling.cpp
+	SaveManagerTest.cpp
+	ScriptSaveManagerTest.cpp
+	ScriptECSTest.cpp
 )
diff --git a/src/test/CollisionTest.cpp b/src/test/CollisionTest.cpp
index dd45eb6..5dbc670 100644
--- a/src/test/CollisionTest.cpp
+++ b/src/test/CollisionTest.cpp
@@ -50,6 +50,7 @@ public:
 class CollisionTest : public Test {
 public:
 	Mediator m;
+	EventManager event_mgr{m};
 	ComponentManager mgr{m};
 	CollisionSystem collision_sys{m};
 	ScriptSystem script_sys{m};
diff --git a/src/test/ECSTest.cpp b/src/test/ECSTest.cpp
index 3e6c61c..af2b7b0 100644
--- a/src/test/ECSTest.cpp
+++ b/src/test/ECSTest.cpp
@@ -1,6 +1,7 @@
 #include <gtest/gtest.h>
 
 #define protected public
+#define private public
 
 #include <crepe/api/GameObject.h>
 #include <crepe/api/Metadata.h>
@@ -16,6 +17,10 @@ class ECSTest : public ::testing::Test {
 
 public:
 	ComponentManager mgr{m};
+
+	class TestComponent : public Component {
+		using Component::Component;
+	};
 };
 
 TEST_F(ECSTest, createGameObject) {
@@ -387,3 +392,77 @@ TEST_F(ECSTest, resetPersistent) {
 	EXPECT_EQ(metadata.size(), 0);
 	EXPECT_EQ(transform.size(), 0);
 }
+
+TEST_F(ECSTest, IDByName) {
+	GameObject foo = mgr.new_object("foo");
+	GameObject bar = mgr.new_object("bar");
+
+	{
+		auto objects = mgr.get_objects_by_name("");
+		EXPECT_EQ(objects.size(), 0);
+	}
+
+	{
+		auto objects = mgr.get_objects_by_name("foo");
+		EXPECT_EQ(objects.size(), 1);
+		EXPECT_TRUE(objects.contains(foo.id));
+	}
+}
+
+TEST_F(ECSTest, IDByTag) {
+	GameObject foo = mgr.new_object("foo", "common tag");
+	GameObject bar = mgr.new_object("bar", "common tag");
+
+	{
+		auto objects = mgr.get_objects_by_tag("");
+		EXPECT_EQ(objects.size(), 0);
+	}
+
+	{
+		auto objects = mgr.get_objects_by_tag("common tag");
+		EXPECT_EQ(objects.size(), 2);
+		EXPECT_TRUE(objects.contains(foo.id));
+		EXPECT_TRUE(objects.contains(bar.id));
+	}
+}
+
+TEST_F(ECSTest, ComponentsByName) {
+	GameObject foo = mgr.new_object("foo");
+	foo.add_component<TestComponent>();
+	GameObject bar = mgr.new_object("bar");
+	bar.add_component<TestComponent>();
+	bar.add_component<TestComponent>();
+
+	{
+		auto objects = mgr.get_components_by_name<TestComponent>("");
+		EXPECT_EQ(objects.size(), 0);
+	}
+
+	{
+		auto objects = mgr.get_components_by_name<TestComponent>("foo");
+		EXPECT_EQ(objects.size(), 1);
+	}
+
+	{
+		auto objects = mgr.get_components_by_name<TestComponent>("bar");
+		EXPECT_EQ(objects.size(), 2);
+	}
+}
+
+TEST_F(ECSTest, ComponentsByTag) {
+	GameObject foo = mgr.new_object("foo", "common tag");
+	foo.add_component<TestComponent>();
+	GameObject bar = mgr.new_object("bar", "common tag");
+	bar.add_component<TestComponent>();
+	bar.add_component<TestComponent>();
+
+	{
+		auto objects = mgr.get_components_by_tag<TestComponent>("");
+		EXPECT_EQ(objects.size(), 0);
+	}
+
+	{
+		auto objects = mgr.get_components_by_tag<TestComponent>("common tag");
+		EXPECT_EQ(objects.size(), 3);
+	}
+}
diff --git a/src/test/EventTest.cpp b/src/test/EventTest.cpp
index ef7fc10..f57a6de 100644
--- a/src/test/EventTest.cpp
+++ b/src/test/EventTest.cpp
@@ -1,56 +1,41 @@
-#include <gmock/gmock.h>
-#include <gtest/gtest.h>
-
 #include <crepe/api/Event.h>
-#include <crepe/api/IKeyListener.h>
-#include <crepe/api/IMouseListener.h>
 #include <crepe/manager/EventManager.h>
-
+#include <crepe/manager/Mediator.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
 using namespace std;
 using namespace std::chrono_literals;
 using namespace crepe;
 
 class EventManagerTest : public ::testing::Test {
 protected:
+	Mediator mediator;
+	EventManager event_mgr{mediator};
 	void SetUp() override {
 		// Clear any existing subscriptions or events before each test
-		EventManager::get_instance().clear();
+		event_mgr.clear();
 	}
 
 	void TearDown() override {
 		// Ensure cleanup after each test
-		EventManager::get_instance().clear();
+		event_mgr.clear();
 	}
 };
-class MockKeyListener : public IKeyListener {
-public:
-	MOCK_METHOD(bool, on_key_pressed, (const KeyPressEvent & event), (override));
-	MOCK_METHOD(bool, on_key_released, (const KeyReleaseEvent & event), (override));
-};
-
-class MockMouseListener : public IMouseListener {
-public:
-	MOCK_METHOD(bool, on_mouse_clicked, (const MouseClickEvent & event), (override));
-	MOCK_METHOD(bool, on_mouse_pressed, (const MousePressEvent & event), (override));
-	MOCK_METHOD(bool, on_mouse_released, (const MouseReleaseEvent & event), (override));
-	MOCK_METHOD(bool, on_mouse_moved, (const MouseMoveEvent & event), (override));
-};
-
 TEST_F(EventManagerTest, EventSubscription) {
 	EventHandler<KeyPressEvent> key_handler = [](const KeyPressEvent & e) { return true; };
 
 	// Subscribe to KeyPressEvent
-	EventManager::get_instance().subscribe<KeyPressEvent>(key_handler, 1);
+	event_mgr.subscribe<KeyPressEvent>(key_handler, 1);
 
 	// Verify subscription (not directly verifiable; test by triggering event)
 
-	EventManager::get_instance().trigger_event<KeyPressEvent>(
+	event_mgr.trigger_event<KeyPressEvent>(
 		KeyPressEvent{
 			.repeat = true,
 			.key = Keycode::A,
 		},
 		1);
-	EventManager::get_instance().trigger_event<KeyPressEvent>(
+	event_mgr.trigger_event<KeyPressEvent>(
 		KeyPressEvent{
 			.repeat = true,
 			.key = Keycode::A,
@@ -68,8 +53,7 @@ TEST_F(EventManagerTest, EventManagerTest_trigger_all_channels) {
 		EXPECT_EQ(e.button, MouseButton::LEFT_MOUSE);
 		return false;
 	};
-	EventManager::get_instance().subscribe<MouseClickEvent>(mouse_handler,
-															EventManager::CHANNEL_ALL);
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler, EventManager::CHANNEL_ALL);
 
 	MouseClickEvent click_event{.mouse_pos = {100, 200}, .button = MouseButton::LEFT_MOUSE};
 	EventManager::get_instance().trigger_event<MouseClickEvent>(click_event,
@@ -87,18 +71,17 @@ TEST_F(EventManagerTest, EventManagerTest_trigger_one_channel) {
 		EXPECT_EQ(e.button, MouseButton::LEFT_MOUSE);
 		return false;
 	};
-	EventManager::get_instance().subscribe<MouseClickEvent>(mouse_handler, test_channel);
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler, test_channel);
 
 	MouseClickEvent click_event{.mouse_pos = {100, 200}, .button = MouseButton::LEFT_MOUSE};
 	EventManager::get_instance().trigger_event<MouseClickEvent>(click_event,
 																EventManager::CHANNEL_ALL);
 
 	EXPECT_FALSE(triggered);
-	EventManager::get_instance().trigger_event<MouseClickEvent>(click_event, test_channel);
+	event_mgr.trigger_event<MouseClickEvent>(click_event, test_channel);
 }
 
 TEST_F(EventManagerTest, EventManagerTest_callback_propagation) {
-	EventManager & event_manager = EventManager::get_instance();
 
 	// Flags to track handler calls
 	bool triggered_true = false;
@@ -127,7 +110,7 @@ TEST_F(EventManagerTest, EventManagerTest_callback_propagation) {
 	event_manager.subscribe<MouseClickEvent>(mouse_handler_false, EventManager::CHANNEL_ALL);
 
 	// Trigger event
-	event_manager.trigger_event<MouseClickEvent>(click_event, EventManager::CHANNEL_ALL);
+	event_mgr.trigger_event<MouseClickEvent>(click_event, EventManager::CHANNEL_ALL);
 
 	// Check that only the true handler was triggered
 	EXPECT_TRUE(triggered_true);
@@ -136,12 +119,12 @@ TEST_F(EventManagerTest, EventManagerTest_callback_propagation) {
 	// Reset and clear
 	triggered_true = false;
 	triggered_false = false;
-	event_manager.clear();
-	event_manager.subscribe<MouseClickEvent>(mouse_handler_false, EventManager::CHANNEL_ALL);
-	event_manager.subscribe<MouseClickEvent>(mouse_handler_true, EventManager::CHANNEL_ALL);
+	event_mgr.clear();
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler_false, EventManager::CHANNEL_ALL);
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler_true, EventManager::CHANNEL_ALL);
 
 	// Trigger event again
-	event_manager.trigger_event<MouseClickEvent>(click_event, EventManager::CHANNEL_ALL);
+	event_mgr.trigger_event<MouseClickEvent>(click_event, EventManager::CHANNEL_ALL);
 
 	// Check that both handlers were triggered
 	EXPECT_TRUE(triggered_true);
@@ -149,47 +132,37 @@ TEST_F(EventManagerTest, EventManagerTest_callback_propagation) {
 }
 
 TEST_F(EventManagerTest, EventManagerTest_queue_dispatch) {
-	EventManager & event_manager = EventManager::get_instance();
 	bool triggered1 = false;
 	bool triggered2 = false;
 	int test_channel = 1;
-
-	// Adjusted to use KeyPressEvent with repeat as the first variable
-	EventHandler<KeyPressEvent> key_handler1 = [&](const KeyPressEvent & e) {
+	EventHandler<MouseClickEvent> mouse_handler1 = [&](const MouseClickEvent & e) {
 		triggered1 = true;
-		EXPECT_EQ(e.repeat, false); // Expecting repeat to be false
-		EXPECT_EQ(e.key, Keycode::A); // Adjust expected key code
+		EXPECT_EQ(e.mouse_x, 100);
+		EXPECT_EQ(e.mouse_y, 200);
+		EXPECT_EQ(e.button, MouseButton::LEFT_MOUSE);
 		return false; // Allows propagation
 	};
-
-	EventHandler<KeyPressEvent> key_handler2 = [&](const KeyPressEvent & e) {
+	EventHandler<MouseClickEvent> mouse_handler2 = [&](const MouseClickEvent & e) {
 		triggered2 = true;
-		EXPECT_EQ(e.repeat, false); // Expecting repeat to be false
-		EXPECT_EQ(e.key, Keycode::A); // Adjust expected key code
+		EXPECT_EQ(e.mouse_x, 100);
+		EXPECT_EQ(e.mouse_y, 200);
+		EXPECT_EQ(e.button, MouseButton::LEFT_MOUSE);
 		return false; // Allows propagation
 	};
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler1);
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler2, test_channel);
 
-	// Subscribe handlers to KeyPressEvent
-	event_manager.subscribe<KeyPressEvent>(key_handler1);
-	event_manager.subscribe<KeyPressEvent>(key_handler2, test_channel);
-
-	// Queue a KeyPressEvent instead of KeyDownEvent
-	event_manager.queue_event<KeyPressEvent>(KeyPressEvent{
-		.repeat = false, .key = Keycode::A}); // Adjust event with repeat flag first
-
-	event_manager.queue_event<KeyPressEvent>(
-		KeyPressEvent{.repeat = false,
-					  .key = Keycode::A}, // Adjust event for second subscription
+	event_mgr.queue_event<MouseClickEvent>(
+		MouseClickEvent{.mouse_x = 100, .mouse_y = 200, .button = MouseButton::LEFT_MOUSE});
+	event_mgr.queue_event<MouseClickEvent>(
+		MouseClickEvent{.mouse_x = 100, .mouse_y = 200, .button = MouseButton::LEFT_MOUSE},
 		test_channel);
-
-	event_manager.dispatch_events();
-
+	event_mgr.dispatch_events();
 	EXPECT_TRUE(triggered1);
 	EXPECT_TRUE(triggered2);
 }
 
 TEST_F(EventManagerTest, EventManagerTest_unsubscribe) {
-	EventManager & event_manager = EventManager::get_instance();
 
 	// Flags to track if handlers are triggered
 	bool triggered1 = false;
@@ -212,15 +185,15 @@ TEST_F(EventManagerTest, EventManagerTest_unsubscribe) {
 		return false; // Allows propagation
 	};
 	// Subscribe handlers
-	subscription_t handler1_id = event_manager.subscribe<MouseClickEvent>(mouse_handler1);
-	subscription_t handler2_id = event_manager.subscribe<MouseClickEvent>(mouse_handler2);
+	subscription_t handler1_id = event_mgr.subscribe<MouseClickEvent>(mouse_handler1);
+	subscription_t handler2_id = event_mgr.subscribe<MouseClickEvent>(mouse_handler2);
 
 	// Queue events
 	event_manager.queue_event<MouseClickEvent>(
 		MouseClickEvent{.mouse_pos = {100, 200}, .button = MouseButton::LEFT_MOUSE});
 
 	// Dispatch events - both handlers should be triggered
-	event_manager.dispatch_events();
+	event_mgr.dispatch_events();
 	EXPECT_TRUE(triggered1); // Handler 1 should be triggered
 	EXPECT_TRUE(triggered2); // Handler 2 should be triggered
 
@@ -229,14 +202,14 @@ TEST_F(EventManagerTest, EventManagerTest_unsubscribe) {
 	triggered2 = false;
 
 	// Unsubscribe handler1
-	event_manager.unsubscribe(handler1_id);
+	event_mgr.unsubscribe(handler1_id);
 
 	// Queue the same event again
 	event_manager.queue_event<MouseClickEvent>(
 		MouseClickEvent{.mouse_pos = {100, 200}, .button = MouseButton::LEFT_MOUSE});
 
 	// Dispatch events - only handler 2 should be triggered, handler 1 should NOT
-	event_manager.dispatch_events();
+	event_mgr.dispatch_events();
 	EXPECT_FALSE(triggered1); // Handler 1 should NOT be triggered
 	EXPECT_TRUE(triggered2); // Handler 2 should be triggered
 
@@ -244,14 +217,14 @@ TEST_F(EventManagerTest, EventManagerTest_unsubscribe) {
 	triggered2 = false;
 
 	// Unsubscribe handler2
-	event_manager.unsubscribe(handler2_id);
+	event_mgr.unsubscribe(handler2_id);
 
 	// Queue the event again
 	event_manager.queue_event<MouseClickEvent>(
 		MouseClickEvent{.mouse_pos = {100, 200}, .button = MouseButton::LEFT_MOUSE});
 
 	// Dispatch events - no handler should be triggered
-	event_manager.dispatch_events();
+	event_mgr.dispatch_events();
 	EXPECT_FALSE(triggered1); // Handler 1 should NOT be triggered
 	EXPECT_FALSE(triggered2); // Handler 2 should NOT be triggered
 }
diff --git a/src/test/InputTest.cpp b/src/test/InputTest.cpp
index a7058b2..a6e60b5 100644
--- a/src/test/InputTest.cpp
+++ b/src/test/InputTest.cpp
@@ -24,10 +24,10 @@ class InputTest : public ::testing::Test {
 public:
 	Mediator mediator;
 	ComponentManager mgr{mediator};
+	SDLContext sdl_context{mediator};
 
 	InputSystem input_system{mediator};
-
-	EventManager & event_manager = EventManager::get_instance();
+	EventManager event_manager{mediator};
 	//GameObject camera;
 
 protected:
diff --git a/src/test/LoopManagerTest.cpp b/src/test/LoopManagerTest.cpp
new file mode 100644
index 0000000..af89d64
--- /dev/null
+++ b/src/test/LoopManagerTest.cpp
@@ -0,0 +1,76 @@
+#include <chrono>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <thread>
+#define private public
+#define protected public
+#include <crepe/api/LoopManager.h>
+#include <crepe/manager/EventManager.h>
+#include <crepe/manager/LoopTimerManager.h>
+using namespace std::chrono;
+using namespace crepe;
+
+class LoopManagerTest : public ::testing::Test {
+protected:
+	class TestGameLoop : public crepe::LoopManager {
+	public:
+		MOCK_METHOD(void, fixed_update, (), (override));
+		MOCK_METHOD(void, frame_update, (), (override));
+	};
+
+	TestGameLoop test_loop;
+	void SetUp() override {}
+};
+
+TEST_F(LoopManagerTest, FixedUpdate) {
+	// Arrange
+	test_loop.loop_timer.set_target_framerate(60);
+
+	// Set expectations for the mock calls
+	EXPECT_CALL(test_loop, frame_update).Times(::testing::Between(55, 65));
+	EXPECT_CALL(test_loop, fixed_update).Times(::testing::Between(48, 52));
+
+	// Start the loop in a separate thread
+	std::thread loop_thread([&]() { test_loop.start(); });
+
+	// Let the loop run for exactly 1 second
+	std::this_thread::sleep_for(std::chrono::seconds(1));
+
+	// Stop the game loop
+	test_loop.game_running = false;
+	// Wait for the loop thread to finish
+	loop_thread.join();
+
+	// Test finished
+}
+TEST_F(LoopManagerTest, ScaledFixedUpdate) {
+	// Arrange
+	test_loop.loop_timer.set_target_framerate(60);
+
+	// Set expectations for the mock calls
+	EXPECT_CALL(test_loop, frame_update).Times(::testing::Between(55, 65));
+	EXPECT_CALL(test_loop, fixed_update).Times(::testing::Between(48, 52));
+
+	// Start the loop in a separate thread
+	std::thread loop_thread([&]() { test_loop.start(); });
+
+	// Let the loop run for exactly 1 second
+	std::this_thread::sleep_for(std::chrono::seconds(1));
+
+	// Stop the game loop
+	test_loop.game_running = false;
+	// Wait for the loop thread to finish
+	loop_thread.join();
+
+	// Test finished
+}
+TEST_F(LoopManagerTest, ShutDown) {
+	// Arrange
+	test_loop.loop_timer.set_target_framerate(60);
+	// Start the loop in a separate thread
+	std::thread loop_thread([&]() { test_loop.start(); });
+	std::this_thread::sleep_for(std::chrono::milliseconds(1));
+	test_loop.event_manager.trigger_event<ShutDownEvent>(ShutDownEvent{});
+	// Wait for the loop thread to finish
+	loop_thread.join();
+}
diff --git a/src/test/LoopTimerTest.cpp b/src/test/LoopTimerTest.cpp
new file mode 100644
index 0000000..5e1eccf
--- /dev/null
+++ b/src/test/LoopTimerTest.cpp
@@ -0,0 +1,78 @@
+#include <chrono>
+#include <gtest/gtest.h>
+#include <thread>
+#define private public
+#define protected public
+#include <crepe/manager/LoopTimerManager.h>
+#include <crepe/manager/Mediator.h>
+using namespace std::chrono;
+using namespace crepe;
+
+class LoopTimerTest : public ::testing::Test {
+protected:
+	Mediator mediator;
+	LoopTimerManager loop_timer{mediator};
+
+	void SetUp() override { loop_timer.start(); }
+};
+
+TEST_F(LoopTimerTest, EnforcesTargetFrameRate) {
+	// Set the target FPS to 60 (which gives a target time per frame of ~16.67 ms)
+	loop_timer.set_target_framerate(60);
+
+	auto start_time = steady_clock::now();
+	loop_timer.enforce_frame_rate();
+
+	auto elapsed_time = steady_clock::now() - start_time;
+	auto elapsed_ms = duration_cast<milliseconds>(elapsed_time).count();
+
+	// For 60 FPS, the target frame time is around 16.67ms
+	ASSERT_NEAR(elapsed_ms, 16.7, 1);
+}
+
+TEST_F(LoopTimerTest, SetTargetFps) {
+	// Set the target FPS to 120
+	loop_timer.set_target_framerate(120);
+
+	// Calculate the expected frame time (~8.33ms per frame)
+	duration_t expected_frame_time = std::chrono::duration<float>(1.0 / 120.0);
+
+	ASSERT_NEAR(loop_timer.frame_target_time.count(), expected_frame_time.count(), 0.001);
+}
+
+TEST_F(LoopTimerTest, DeltaTimeCalculation) {
+	// Set the target FPS to 60 (16.67 ms per frame)
+	loop_timer.set_target_framerate(60);
+
+	auto start_time = steady_clock::now();
+	loop_timer.update();
+	auto end_time = steady_clock::now();
+
+	// Check the delta time
+	duration_t delta_time = loop_timer.get_delta_time();
+
+	auto elapsed_time = duration_cast<seconds>(end_time - start_time).count();
+
+	// Assert that delta_time is close to the elapsed time
+	ASSERT_NEAR(delta_time.count(), elapsed_time, 1);
+}
+
+TEST_F(LoopTimerTest, getCurrentTime) {
+	// Set the target FPS to 60 (16.67 ms per frame)
+	loop_timer.set_target_framerate(60);
+
+	auto start_time = steady_clock::now();
+
+	// Sleep
+	std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+	loop_timer.update();
+
+	auto end_time = steady_clock::now();
+
+	// Get the elapsed time in seconds as a double
+	auto elapsed_time
+		= std::chrono::duration_cast<elapsed_time_t>(end_time - start_time).count();
+
+	ASSERT_NEAR(loop_timer.get_elapsed_time().count(), elapsed_time, 5);
+}
diff --git a/src/test/ParticleTest.cpp b/src/test/ParticleTest.cpp
index 1409c4f..9112a3f 100644
--- a/src/test/ParticleTest.cpp
+++ b/src/test/ParticleTest.cpp
@@ -1,10 +1,10 @@
+#include "api/Asset.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/manager/ComponentManager.h>
 #include <crepe/system/ParticleSystem.h>
@@ -30,7 +30,7 @@ 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");
+			auto s1 = Asset("asset/texture/img.png");
 			Sprite & test_sprite = game_object.add_component<Sprite>(
 				s1, Sprite::Data{
 						.color = color,
diff --git a/src/test/Profiling.cpp b/src/test/Profiling.cpp
index c753bca..35f52dc 100644
--- a/src/test/Profiling.cpp
+++ b/src/test/Profiling.cpp
@@ -1,9 +1,11 @@
-#include "manager/Mediator.h"
-#include "system/ParticleSystem.h"
-#include "system/PhysicsSystem.h"
-#include "system/RenderSystem.h"
 #include <chrono>
 #include <cmath>
+#include <crepe/api/Asset.h>
+#include <crepe/manager/Mediator.h>
+#include <crepe/manager/ResourceManager.h>
+#include <crepe/system/ParticleSystem.h>
+#include <crepe/system/PhysicsSystem.h>
+#include <crepe/system/RenderSystem.h>
 #include <gtest/gtest.h>
 
 #define private public
@@ -15,6 +17,7 @@
 #include <crepe/api/Rigidbody.h>
 #include <crepe/api/Script.h>
 #include <crepe/api/Transform.h>
+#include <crepe/facade/SDLContext.h>
 #include <crepe/manager/ComponentManager.h>
 #include <crepe/manager/EventManager.h>
 #include <crepe/system/CollisionSystem.h>
@@ -54,6 +57,8 @@ public:
 	const std::chrono::microseconds duration = 16000us;
 
 	Mediator m;
+	SDLContext sdl_context{m};
+	ResourceManager resman{m};
 	ComponentManager mgr{m};
 	// Add system used for profling tests
 	CollisionSystem collision_sys{m};
@@ -167,15 +172,15 @@ TEST_F(DISABLED_ProfilingTest, Profiling_2) {
 			gameobject.add_component<BoxCollider>(vec2{0, 0}, vec2{1, 1});
 
 			gameobject.add_component<BehaviorScript>().set_script<TestScript>();
-			auto img = Texture("asset/texture/square.png");
 			Sprite & test_sprite = gameobject.add_component<Sprite>(
-				img, Sprite::Data{
-						 .color = {0, 0, 0, 0},
-						 .flip = {.flip_x = false, .flip_y = false},
-						 .sorting_in_layer = 1,
-						 .order_in_layer = 1,
-						 .size = {.y = 500},
-					 });
+				Asset{"asset/texture/square.png"},
+				Sprite::Data{
+					.color = {0, 0, 0, 0},
+					.flip = {.flip_x = false, .flip_y = false},
+					.sorting_in_layer = 1,
+					.order_in_layer = 1,
+					.size = {.y = 500},
+				});
 		}
 
 		this->game_object_count++;
@@ -205,15 +210,15 @@ TEST_F(DISABLED_ProfilingTest, Profiling_3) {
 			});
 			gameobject.add_component<BoxCollider>(vec2{0, 0}, vec2{1, 1});
 			gameobject.add_component<BehaviorScript>().set_script<TestScript>();
-			auto img = Texture("asset/texture/square.png");
 			Sprite & test_sprite = gameobject.add_component<Sprite>(
-				img, Sprite::Data{
-						 .color = {0, 0, 0, 0},
-						 .flip = {.flip_x = false, .flip_y = false},
-						 .sorting_in_layer = 1,
-						 .order_in_layer = 1,
-						 .size = {.y = 500},
-					 });
+				Asset{"asset/texture/square.png"},
+				Sprite::Data{
+					.color = {0, 0, 0, 0},
+					.flip = {.flip_x = false, .flip_y = false},
+					.sorting_in_layer = 1,
+					.order_in_layer = 1,
+					.size = {.y = 500},
+				});
 			auto & test = gameobject.add_component<ParticleEmitter>(ParticleEmitter::Data{
 				.max_particles = 10,
 				.emission_rate = 100,
diff --git a/src/test/RenderSystemTest.cpp b/src/test/RenderSystemTest.cpp
index 205f534..b4519cb 100644
--- a/src/test/RenderSystemTest.cpp
+++ b/src/test/RenderSystemTest.cpp
@@ -1,3 +1,6 @@
+#include "api/Asset.h"
+#include "facade/SDLContext.h"
+#include "manager/ResourceManager.h"
 #include "types.h"
 #include <functional>
 #include <gtest/gtest.h>
@@ -11,7 +14,6 @@
 #include <crepe/api/Color.h>
 #include <crepe/api/GameObject.h>
 #include <crepe/api/Sprite.h>
-#include <crepe/api/Texture.h>
 #include <crepe/manager/ComponentManager.h>
 
 #include <crepe/system/RenderSystem.h>
@@ -25,6 +27,8 @@ class RenderSystemTest : public Test {
 
 public:
 	ComponentManager mgr{m};
+	SDLContext ctx{m};
+	ResourceManager resource_manager{m};
 	RenderSystem sys{m};
 	GameObject entity1 = this->mgr.new_object("name");
 	GameObject entity2 = this->mgr.new_object("name");
@@ -32,10 +36,10 @@ public:
 	GameObject entity4 = this->mgr.new_object("name");
 
 	void SetUp() override {
-		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 s1 = Asset("asset/texture/img.png");
+		auto s2 = Asset("asset/texture/img.png");
+		auto s3 = Asset("asset/texture/img.png");
+		auto s4 = Asset("asset/texture/img.png");
 		auto & sprite1
 			= entity1.add_component<Sprite>(s1, Sprite::Data{
 													.color = Color(0, 0, 0, 0),
@@ -45,7 +49,6 @@ public:
 													.size = {10, 10},
 												});
 
-		ASSERT_NE(sprite1.texture.texture.get(), nullptr);
 		EXPECT_EQ(sprite1.data.order_in_layer, 5);
 		EXPECT_EQ(sprite1.data.sorting_in_layer, 5);
 		auto & sprite2
@@ -55,7 +58,6 @@ public:
 													.sorting_in_layer = 2,
 													.order_in_layer = 1,
 												});
-		ASSERT_NE(sprite2.texture.texture.get(), nullptr);
 		EXPECT_EQ(sprite2.data.sorting_in_layer, 2);
 		EXPECT_EQ(sprite2.data.order_in_layer, 1);
 
@@ -66,7 +68,6 @@ public:
 													.sorting_in_layer = 1,
 													.order_in_layer = 2,
 												});
-		ASSERT_NE(sprite3.texture.texture.get(), nullptr);
 		EXPECT_EQ(sprite3.data.sorting_in_layer, 1);
 		EXPECT_EQ(sprite3.data.order_in_layer, 2);
 
@@ -77,27 +78,12 @@ public:
 													.sorting_in_layer = 1,
 													.order_in_layer = 1,
 												});
-		ASSERT_NE(sprite4.texture.texture.get(), nullptr);
 		EXPECT_EQ(sprite4.data.sorting_in_layer, 1);
 		EXPECT_EQ(sprite4.data.order_in_layer, 1);
 	}
 };
 
-TEST_F(RenderSystemTest, expected_throws) {
-	GameObject entity1 = this->mgr.new_object("NAME");
-
-	// no texture img
-	EXPECT_ANY_THROW({
-		auto test = Texture("");
-		auto & sprite1 = entity1.add_component<Sprite>(
-			test, Sprite::Data{
-					  .color = Color(0, 0, 0, 0),
-					  .flip = Sprite::FlipSettings{false, false},
-					  .sorting_in_layer = 1,
-					  .order_in_layer = 1,
-				  });
-	});
-
+TEST_F(RenderSystemTest, NoCamera) {
 	// No camera
 	EXPECT_ANY_THROW({ this->sys.update(); });
 }
@@ -185,7 +171,7 @@ TEST_F(RenderSystemTest, Color) {
 								  Camera::Data{.bg_color = Color::WHITE, .zoom = 1.0f});
 
 	auto & sprite = this->mgr.get_components_by_id<Sprite>(entity1.id).front().get();
-	ASSERT_NE(sprite.texture.texture.get(), nullptr);
+	//ASSERT_NE(sprite.texture.texture.get(), nullptr);
 
 	sprite.data.color = Color::GREEN;
 	EXPECT_EQ(sprite.data.color.r, Color::GREEN.r);
diff --git a/src/test/ResourceManagerTest.cpp b/src/test/ResourceManagerTest.cpp
new file mode 100644
index 0000000..965eeab
--- /dev/null
+++ b/src/test/ResourceManagerTest.cpp
@@ -0,0 +1,84 @@
+#include "manager/Mediator.h"
+#include <gtest/gtest.h>
+
+#define private public
+#define protected public
+
+#include <crepe/api/GameObject.h>
+#include <crepe/manager/ResourceManager.h>
+#include <crepe/util/Log.h>
+
+using namespace std;
+using namespace crepe;
+using namespace testing;
+
+class ResourceManagerTest : public Test {
+	Mediator mediator;
+
+public:
+	ResourceManager resource_manager{mediator};
+
+	class Unrelated : public Resource {
+		using Resource::Resource;
+	};
+
+	Asset asset_a{"asset/texture/img.png"};
+	Asset asset_b{"asset/texture/ERROR.png"};
+
+	class TestResource : public Resource {
+	public:
+		static unsigned instances;
+
+	public:
+		const unsigned instance;
+		TestResource(const Asset & src, Mediator & mediator)
+			: Resource(src, mediator),
+			  instance(this->instances++) {}
+		~TestResource() { this->instances--; }
+		bool operator==(const TestResource & other) const {
+			return this->instance == other.instance;
+		}
+	};
+
+private:
+	void SetUp() override { TestResource::instances = 0; }
+};
+unsigned ResourceManagerTest::TestResource::instances = 0;
+
+TEST_F(ResourceManagerTest, Default) {
+	TestResource & res_1 = resource_manager.get<TestResource>(asset_a);
+	TestResource & res_2 = resource_manager.get<TestResource>(asset_a);
+	TestResource & res_3 = resource_manager.get<TestResource>(asset_b);
+	TestResource & res_4 = resource_manager.get<TestResource>(asset_b);
+
+	ASSERT_EQ(res_1, res_2);
+	ASSERT_EQ(res_3, res_4);
+	EXPECT_NE(res_1, res_3);
+
+	EXPECT_EQ(TestResource::instances, 2);
+
+	resource_manager.clear();
+}
+
+TEST_F(ResourceManagerTest, Persistent) {
+	resource_manager.set_persistent(asset_a, true);
+	EXPECT_EQ(TestResource::instances, 0);
+
+	resource_manager.get<TestResource>(asset_a);
+	resource_manager.get<TestResource>(asset_a);
+	resource_manager.get<TestResource>(asset_b);
+	resource_manager.get<TestResource>(asset_b);
+	EXPECT_EQ(TestResource::instances, 2);
+
+	resource_manager.clear();
+	EXPECT_EQ(TestResource::instances, 1);
+
+	resource_manager.clear_all();
+	EXPECT_EQ(TestResource::instances, 0);
+}
+
+TEST_F(ResourceManagerTest, UnmatchedType) {
+	EXPECT_NO_THROW({ resource_manager.get<TestResource>(asset_a); });
+
+	EXPECT_THROW({ resource_manager.get<Unrelated>(asset_a); }, runtime_error);
+}
diff --git a/src/test/SaveManagerTest.cpp b/src/test/SaveManagerTest.cpp
new file mode 100644
index 0000000..e9b0c29
--- /dev/null
+++ b/src/test/SaveManagerTest.cpp
@@ -0,0 +1,40 @@
+#include <gtest/gtest.h>
+
+#include <crepe/ValueBroker.h>
+#include <crepe/facade/DB.h>
+#include <crepe/manager/SaveManager.h>
+
+using namespace std;
+using namespace crepe;
+using namespace testing;
+
+class SaveManagerTest : public Test {
+	Mediator m;
+	class TestSaveManager : public SaveManager {
+		using SaveManager::SaveManager;
+
+		// in-memory database for testing
+		DB db{};
+		virtual DB & get_db() override { return this->db; }
+	};
+
+public:
+	TestSaveManager mgr{m};
+};
+
+TEST_F(SaveManagerTest, ReadWrite) {
+	ASSERT_FALSE(mgr.has("foo"));
+	mgr.set<string>("foo", "bar");
+	ASSERT_TRUE(mgr.has("foo"));
+
+	ValueBroker value = mgr.get<string>("foo");
+	EXPECT_EQ(value.get(), "bar");
+}
+
+TEST_F(SaveManagerTest, DefaultValue) {
+	ValueBroker value = mgr.get<int>("foo", 3);
+
+	ASSERT_EQ(value.get(), 3);
+	value.set(5);
+	ASSERT_EQ(value.get(), 5);
+}
diff --git a/src/test/ScriptECSTest.cpp b/src/test/ScriptECSTest.cpp
new file mode 100644
index 0000000..1ec33ba
--- /dev/null
+++ b/src/test/ScriptECSTest.cpp
@@ -0,0 +1,41 @@
+#include <gtest/gtest.h>
+
+#define protected public
+
+#include <crepe/api/BehaviorScript.h>
+#include <crepe/api/GameObject.h>
+#include <crepe/api/Metadata.h>
+#include <crepe/api/Script.h>
+#include <crepe/manager/ComponentManager.h>
+#include <crepe/system/ScriptSystem.h>
+
+#include "ScriptTest.h"
+
+using namespace std;
+using namespace crepe;
+using namespace testing;
+
+class ScriptECSTest : public ScriptTest {
+public:
+	class TestComponent : public Component {
+		using Component::Component;
+	};
+};
+
+TEST_F(ScriptECSTest, GetOwnComponent) {
+	MyScript & script = this->script;
+	Metadata & metadata = script.get_component<Metadata>();
+
+	EXPECT_EQ(metadata.name, OBJ_NAME);
+}
+
+TEST_F(ScriptECSTest, GetOwnComponents) {
+	const unsigned COUNT = 4;
+
+	for (unsigned i = 0; i < COUNT; i++) entity.add_component<TestComponent>();
+
+	MyScript & script = this->script;
+	RefVector<TestComponent> components = script.get_components<TestComponent>();
+
+	EXPECT_EQ(components.size(), COUNT);
+}
diff --git a/src/test/ScriptEventTest.cpp b/src/test/ScriptEventTest.cpp
index 5da31e7..c1b4028 100644
--- a/src/test/ScriptEventTest.cpp
+++ b/src/test/ScriptEventTest.cpp
@@ -26,7 +26,7 @@ public:
 	class MyEvent : public Event {};
 };
 
-TEST_F(ScriptEventTest, Inactive) {
+TEST_F(ScriptEventTest, Default) {
 	BehaviorScript & behaviorscript = this->behaviorscript;
 	MyScript & script = this->script;
 	EventManager & evmgr = this->event_manager;
diff --git a/src/test/ScriptSaveManagerTest.cpp b/src/test/ScriptSaveManagerTest.cpp
new file mode 100644
index 0000000..64403c4
--- /dev/null
+++ b/src/test/ScriptSaveManagerTest.cpp
@@ -0,0 +1,35 @@
+#include <gtest/gtest.h>
+
+// stupid hack to allow access to private/protected members under test
+#define private public
+#define protected public
+
+#include <crepe/facade/DB.h>
+#include <crepe/manager/SaveManager.h>
+
+#include "ScriptTest.h"
+
+using namespace std;
+using namespace crepe;
+using namespace testing;
+
+class ScriptSaveManagerTest : public ScriptTest {
+public:
+	class TestSaveManager : public SaveManager {
+		using SaveManager::SaveManager;
+
+		// in-memory database for testing
+		DB db{};
+		virtual DB & get_db() override { return this->db; }
+	};
+
+	TestSaveManager save_mgr{mediator};
+};
+
+TEST_F(ScriptSaveManagerTest, GetSaveManager) {
+	MyScript & script = this->script;
+
+	SaveManager & mgr = script.get_save_manager();
+
+	EXPECT_EQ(&mgr, &save_mgr);
+}
diff --git a/src/test/ScriptSceneTest.cpp b/src/test/ScriptSceneTest.cpp
index 9ee1e52..2568049 100644
--- a/src/test/ScriptSceneTest.cpp
+++ b/src/test/ScriptSceneTest.cpp
@@ -18,7 +18,7 @@ public:
 	class MyScene : public Scene {};
 };
 
-TEST_F(ScriptSceneTest, Inactive) {
+TEST_F(ScriptSceneTest, Default) {
 	BehaviorScript & behaviorscript = this->behaviorscript;
 	MyScript & script = this->script;
 
diff --git a/src/test/ScriptTest.cpp b/src/test/ScriptTest.cpp
index 1d2d6dd..acdae70 100644
--- a/src/test/ScriptTest.cpp
+++ b/src/test/ScriptTest.cpp
@@ -6,7 +6,6 @@
 #define protected public
 
 #include "ScriptTest.h"
-#include <crepe/api/GameObject.h>
 
 using namespace std;
 using namespace crepe;
@@ -14,7 +13,6 @@ using namespace testing;
 
 void ScriptTest::SetUp() {
 	auto & mgr = this->component_manager;
-	GameObject entity = mgr.new_object("name");
 	BehaviorScript & component = entity.add_component<BehaviorScript>();
 
 	this->behaviorscript = component;
diff --git a/src/test/ScriptTest.h b/src/test/ScriptTest.h
index 1bbfdd3..31fa7c9 100644
--- a/src/test/ScriptTest.h
+++ b/src/test/ScriptTest.h
@@ -6,15 +6,18 @@
 #include <crepe/api/BehaviorScript.h>
 #include <crepe/api/Script.h>
 #include <crepe/manager/ComponentManager.h>
+#include <crepe/manager/EventManager.h>
 #include <crepe/system/ScriptSystem.h>
-
 class ScriptTest : public testing::Test {
 protected:
 	crepe::Mediator mediator;
+	static constexpr const char * OBJ_NAME = "foo";
 
 public:
 	crepe::ComponentManager component_manager{mediator};
 	crepe::ScriptSystem system{mediator};
+	crepe::EventManager event_mgr{mediator};
+	crepe::GameObject entity = component_manager.new_object(OBJ_NAME);
 
 	class MyScript : public crepe::Script {
 		// NOTE: explicitly stating `public:` is not required on actual scripts
diff --git a/src/test/Vector2Test.cpp b/src/test/Vector2Test.cpp
index 17bca41..1e21af9 100644
--- a/src/test/Vector2Test.cpp
+++ b/src/test/Vector2Test.cpp
@@ -382,3 +382,151 @@ TEST_F(Vector2Test, NotEquals) {
 	EXPECT_FALSE(long_vec1 != long_vec1);
 	EXPECT_TRUE(long_vec1 != long_vec2);
 }
+
+TEST_F(Vector2Test, Truncate) {
+	Vector2<int> vec = {3, 4};
+	vec.truncate(3);
+	EXPECT_EQ(vec.x, 0);
+	EXPECT_EQ(vec.y, 0);
+
+	Vector2<double> vec2 = {3.0, 4.0};
+	vec2.truncate(3.0);
+	EXPECT_FLOAT_EQ(vec2.x, 1.8);
+	EXPECT_FLOAT_EQ(vec2.y, 2.4);
+
+	Vector2<long> vec3 = {3, 4};
+	vec3.truncate(3);
+	EXPECT_EQ(vec3.x, 0);
+	EXPECT_EQ(vec3.y, 0);
+
+	Vector2<float> vec4 = {3.0f, 4.0f};
+	vec4.truncate(3.0f);
+	EXPECT_FLOAT_EQ(vec4.x, 1.8f);
+	EXPECT_FLOAT_EQ(vec4.y, 2.4f);
+}
+
+TEST_F(Vector2Test, Normalize) {
+	Vector2<int> vec = {3, 4};
+	vec.normalize();
+	EXPECT_EQ(vec.x, 0);
+	EXPECT_EQ(vec.y, 0);
+
+	Vector2<double> vec2 = {3.0, 4.0};
+	vec2.normalize();
+	EXPECT_FLOAT_EQ(vec2.x, 0.6);
+	EXPECT_FLOAT_EQ(vec2.y, 0.8);
+
+	Vector2<long> vec3 = {3, 4};
+	vec3.normalize();
+	EXPECT_EQ(vec3.x, 0);
+	EXPECT_EQ(vec3.y, 0);
+
+	Vector2<float> vec4 = {3.0f, 4.0f};
+	vec4.normalize();
+	EXPECT_FLOAT_EQ(vec4.x, 0.6f);
+	EXPECT_FLOAT_EQ(vec4.y, 0.8f);
+}
+
+TEST_F(Vector2Test, Length) {
+	Vector2<int> vec = {3, 4};
+	EXPECT_EQ(vec.length(), 5);
+
+	Vector2<double> vec2 = {3.0, 4.0};
+	EXPECT_FLOAT_EQ(vec2.length(), 5.0);
+
+	Vector2<long> vec3 = {3, 4};
+	EXPECT_EQ(vec3.length(), 5);
+
+	Vector2<float> vec4 = {3.0f, 4.0f};
+	EXPECT_FLOAT_EQ(vec4.length(), 5.0f);
+}
+
+TEST_F(Vector2Test, LengthSquared) {
+	Vector2<int> vec = {3, 4};
+	EXPECT_EQ(vec.length_squared(), 25);
+
+	Vector2<double> vec2 = {3.0, 4.0};
+	EXPECT_FLOAT_EQ(vec2.length_squared(), 25.0);
+
+	Vector2<long> vec3 = {3, 4};
+	EXPECT_EQ(vec3.length_squared(), 25);
+
+	Vector2<float> vec4 = {3.0f, 4.0f};
+	EXPECT_FLOAT_EQ(vec4.length_squared(), 25.0f);
+}
+
+TEST_F(Vector2Test, Dot) {
+	Vector2<int> vec1 = {3, 4};
+	Vector2<int> vec2 = {5, 6};
+	EXPECT_EQ(vec1.dot(vec2), 39);
+
+	Vector2<double> vec3 = {3.0, 4.0};
+	Vector2<double> vec4 = {5.0, 6.0};
+	EXPECT_FLOAT_EQ(vec3.dot(vec4), 39.0);
+
+	Vector2<long> vec5 = {3, 4};
+	Vector2<long> vec6 = {5, 6};
+	EXPECT_EQ(vec5.dot(vec6), 39);
+
+	Vector2<float> vec7 = {3.0f, 4.0f};
+	Vector2<float> vec8 = {5.0f, 6.0f};
+	EXPECT_FLOAT_EQ(vec7.dot(vec8), 39.0f);
+}
+
+TEST_F(Vector2Test, Distance) {
+	Vector2<int> vec1 = {1, 1};
+	Vector2<int> vec2 = {4, 5};
+	EXPECT_EQ(vec1.distance(vec2), 5);
+
+	Vector2<double> vec3 = {1.0, 1.0};
+	Vector2<double> vec4 = {4.0, 5.0};
+	EXPECT_FLOAT_EQ(vec3.distance(vec4), 5.0);
+
+	Vector2<long> vec5 = {1, 1};
+	Vector2<long> vec6 = {4, 5};
+	EXPECT_EQ(vec5.distance(vec6), 5);
+
+	Vector2<float> vec7 = {1.0f, 1.0f};
+	Vector2<float> vec8 = {4.0f, 5.0f};
+	EXPECT_FLOAT_EQ(vec7.distance(vec8), 5.0f);
+}
+
+TEST_F(Vector2Test, DistanceSquared) {
+	Vector2<int> vec1 = {3, 4};
+	Vector2<int> vec2 = {5, 6};
+	EXPECT_EQ(vec1.distance_squared(vec2), 8);
+
+	Vector2<double> vec3 = {3.0, 4.0};
+	Vector2<double> vec4 = {5.0, 6.0};
+	EXPECT_FLOAT_EQ(vec3.distance_squared(vec4), 8.0);
+
+	Vector2<long> vec5 = {3, 4};
+	Vector2<long> vec6 = {5, 6};
+	EXPECT_EQ(vec5.distance_squared(vec6), 8);
+
+	Vector2<float> vec7 = {3.0f, 4.0f};
+	Vector2<float> vec8 = {5.0f, 6.0f};
+	EXPECT_FLOAT_EQ(vec7.distance_squared(vec8), 8.0f);
+}
+
+TEST_F(Vector2Test, Perpendicular) {
+	Vector2<int> vec = {3, 4};
+	Vector2<int> result = vec.perpendicular();
+	EXPECT_EQ(result.x, -4);
+	EXPECT_EQ(result.y, 3);
+
+	Vector2<double> vec2 = {3.0, 4.0};
+	Vector2<double> result2 = vec2.perpendicular();
+	EXPECT_FLOAT_EQ(result2.x, -4.0);
+	EXPECT_FLOAT_EQ(result2.y, 3.0);
+
+	Vector2<long> vec3 = {3, 4};
+	Vector2<long> result3 = vec3.perpendicular();
+	EXPECT_EQ(result3.x, -4);
+	EXPECT_EQ(result3.y, 3);
+
+	Vector2<float> vec4 = {3.0f, 4.0f};
+	Vector2<float> result4 = vec4.perpendicular();
+	EXPECT_FLOAT_EQ(result4.x, -4.0f);
+	EXPECT_FLOAT_EQ(result4.y, 3.0f);
+}
diff --git a/src/test/main.cpp b/src/test/main.cpp
index aece72d..ed2aed5 100644
--- a/src/test/main.cpp
+++ b/src/test/main.cpp
@@ -1,9 +1,5 @@
-#include <gtest/gtest.h>
-
-#define protected public
-#define private public
-
 #include <crepe/api/Config.h>
+#include <gtest/gtest.h>
 
 using namespace crepe;
 using namespace testing;
@@ -11,12 +7,14 @@ using namespace testing;
 class GlobalConfigReset : public EmptyTestEventListener {
 public:
 	Config & cfg = Config::get_instance();
-	Config cfg_default = Config();
 
 	// This function is called before each test
 	void OnTestStart(const TestInfo &) override {
-		cfg = cfg_default;
-		cfg.log.level = Log::Level::WARNING;
+		cfg = {
+			.log = {
+				.level = Log::Level::WARNING,
+			},
+		};
 	}
 };