merge

46 files changed, 968 insertions, 830 deletions

diff --git a/src/crepe/api/Asset.cpp b/src/crepe/api/Asset.cpp
new file mode 100644
index 0000000..e148367
--- /dev/null
+++ b/src/crepe/api/Asset.cpp
@@ -0,0 +1,54 @@
+#include <filesystem>
+#include <stdexcept>
+#include <whereami.h>
+
+#include "api/Config.h"
+
+#include "Asset.h"
+
+using namespace crepe;
+using namespace std;
+
+Asset::Asset(const string & src) : src(find_asset(src)) {}
+Asset::Asset(const char * src) : src(find_asset(src)) {}
+
+const string & Asset::get_path() const noexcept { return this->src; }
+
+string Asset::find_asset(const string & src) const {
+	auto & cfg = Config::get_instance();
+	string & root_pattern = cfg.asset.root_pattern;
+
+	// if root_pattern is empty, find_asset must return all paths as-is
+	if (root_pattern.empty()) return src;
+
+	// absolute paths do not need to be resolved, only canonicalized
+	filesystem::path path = src;
+	if (path.is_absolute()) return filesystem::canonical(path);
+
+	// find directory matching root_pattern
+	filesystem::path root = this->whereami();
+	while (1) {
+		if (filesystem::exists(root / root_pattern)) break;
+		if (!root.has_parent_path())
+			throw runtime_error(format("Asset: Cannot find root pattern ({})", root_pattern));
+		root = root.parent_path();
+	}
+
+	// join path to root (base directory) and canonicalize
+	return filesystem::canonical(root / path);
+}
+
+string Asset::whereami() const noexcept {
+	string path;
+	size_t path_length = wai_getExecutablePath(NULL, 0, NULL);
+	path.resize(path_length + 1); // wai writes null byte
+	wai_getExecutablePath(path.data(), path_length, NULL);
+	path.resize(path_length);
+	return path;
+}
+
+bool Asset::operator==(const Asset & other) const noexcept { return this->src == other.src; }
+
+size_t std::hash<const Asset>::operator()(const Asset & asset) const noexcept {
+	return std::hash<string>{}(asset.get_path());
+};
diff --git a/src/crepe/api/Asset.h b/src/crepe/api/Asset.h
new file mode 100644
index 0000000..bfd0ac7
--- /dev/null
+++ b/src/crepe/api/Asset.h
@@ -0,0 +1,84 @@
+#pragma once
+
+#include <string>
+
+namespace crepe {
+
+/**
+ * \brief Asset location helper
+ *
+ * This class is used to locate game asset files, and should *always* be used
+ * instead of reading file paths directly.
+ */
+class Asset {
+public:
+	/**
+	 * \param src  Unique identifier to asset
+	 */
+	Asset(const std::string & src);
+	/**
+	 * \param src  Unique identifier to asset
+	 */
+	Asset(const char * src);
+
+public:
+	/**
+	 * \brief Get the path to this asset
+	 * \return path to this asset
+	 */
+	const std::string & get_path() const noexcept;
+
+	/**
+	 * \brief Comparison operator
+	 * \param other Possibly different instance of \c Asset to test equality against
+	 * \return True if \c this and \c other are equal
+	 */
+	bool operator==(const Asset & other) const noexcept;
+
+private:
+	//! path to asset
+	const std::string src;
+
+private:
+	/**
+	 * \brief Locate asset path, or throw exception if it cannot be found
+	 *
+	 * This function resolves asset locations relative to crepe::Config::root_pattern if it is
+	 * set and \p src is a relative path. If \p src is an absolute path, it is canonicalized.
+	 * This function only returns if the file can be found.
+	 *
+	 * \param src Arbitrary path to resource file
+	 *
+	 * \returns \p src if crepe::Config::root_pattern is empty
+	 * \returns Canonical path to \p src
+	 *
+	 * \throws std::runtime_error if root_pattern cannot be found
+	 * \throws std::filesystem::filesystem_error if the resolved path does not exist
+	 * \throws std::filesystem::filesystem_error if the path cannot be canonicalized
+	 */
+	std::string find_asset(const std::string & src) const;
+	/**
+	 * \returns The path to the current executable
+	 */
+	std::string whereami() const noexcept;
+};
+
+} // namespace crepe
+
+namespace std {
+
+//! Hash helper struct
+template <>
+struct hash<const crepe::Asset> {
+	/**
+	 * \brief Hash operator for crepe::Asset
+	 *
+	 * This function hashes a crepe::Asset instance, allowing it to be used as a key in an \c
+	 * std::unordered_map.
+	 *
+	 * \returns Hash value
+	 */
+	size_t operator()(const crepe::Asset & asset) const noexcept;
+};
+
+} // namespace std
diff --git a/src/crepe/api/BehaviorScript.h b/src/crepe/api/BehaviorScript.h
index 9d85d4c..d556fe5 100644
--- a/src/crepe/api/BehaviorScript.h
+++ b/src/crepe/api/BehaviorScript.h
@@ -39,11 +39,14 @@ public:
 	 * \brief Set the concrete script of this component
 	 *
 	 * \tparam T Concrete script type (derived from \c crepe::Script)
+	 * \tparam Args Arguments for concrete script constructor
+	 *
+	 * \param args Arguments for concrete script constructor (forwarded using perfect forwarding)
 	 *
 	 * \returns Reference to BehaviorScript component (`*this`)
 	 */
-	template <class T>
-	BehaviorScript & set_script();
+	template <class T, typename... Args>
+	BehaviorScript & set_script(Args &&... args);
 
 protected:
 	//! Script instance
diff --git a/src/crepe/api/BehaviorScript.hpp b/src/crepe/api/BehaviorScript.hpp
index d80321d..bd59337 100644
--- a/src/crepe/api/BehaviorScript.hpp
+++ b/src/crepe/api/BehaviorScript.hpp
@@ -9,13 +9,17 @@
 
 namespace crepe {
 
-template <class T>
-BehaviorScript & BehaviorScript::set_script() {
+template <class T, typename... Args>
+BehaviorScript & BehaviorScript::set_script(Args &&... args) {
 	dbg_trace();
 	static_assert(std::is_base_of<Script, T>::value);
-	Script * s = new T();
+	Script * s = new T(std::forward<Args>(args)...);
+
 	s->game_object_id = this->game_object_id;
-	s->component_manager_ref = &this->component_manager;
+	s->active = this->active;
+	s->component_manager = this->component_manager;
+	s->event_manager = EventManager::get_instance();
+
 	this->script = std::unique_ptr<Script>(s);
 	return *this;
 }
diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index a185ca6..50c51ed 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -12,9 +12,7 @@ target_sources(crepe PUBLIC
 	SaveManager.cpp
 	Config.cpp
 	Metadata.cpp
-	Scene.cpp
 	SceneManager.cpp
-	Vector2.cpp
 	Camera.cpp
 	Animator.cpp
 	EventManager.cpp
@@ -22,7 +20,9 @@ target_sources(crepe PUBLIC
 	IMouseListener.cpp
 	LoopManager.cpp
 	LoopTimer.cpp
+	Asset.cpp
 	EventHandler.cpp
+	Script.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -36,6 +36,7 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Rigidbody.h
 	Sprite.h
 	Vector2.h
+	Vector2.hpp
 	Color.h
 	Texture.h 
 	AssetManager.h 
@@ -56,4 +57,5 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	IMouseListener.h
 	LoopManager.h
 	LoopTimer.h
+	Asset.h
 )
diff --git a/src/crepe/api/Color.cpp b/src/crepe/api/Color.cpp
index 9e5f187..29bd77a 100644
--- a/src/crepe/api/Color.cpp
+++ b/src/crepe/api/Color.cpp
@@ -2,32 +2,11 @@
 
 using namespace crepe;
 
-Color Color::white = Color(255, 255, 255, 0);
-Color Color::red = Color(255, 0, 0, 0);
-Color Color::green = Color(0, 255, 0, 0);
-Color Color::blue = Color(0, 0, 255, 0);
-Color Color::black = Color(0, 0, 0, 0);
-Color Color::cyan = Color(0, 255, 255, 0);
-Color Color::yellow = Color(255, 255, 0, 0);
-Color Color::magenta = Color(255, 0, 255, 0);
-
-Color::Color(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha) {
-	this->a = alpha;
-	this->r = red;
-	this->g = green;
-	this->b = blue;
-};
-
-const Color & Color::get_white() { return Color::white; };
-
-const Color & Color::get_red() { return Color::red; };
-const Color & Color::get_green() { return Color::green; };
-const Color & Color::get_blue() { return Color::blue; };
-
-const Color & Color::get_black() { return Color::black; };
-
-const Color & Color::get_cyan() { return Color::cyan; };
-
-const Color & Color::get_yellow() { return Color::yellow; };
-
-const Color & Color::get_magenta() { return Color::magenta; };
+const Color Color::WHITE{0xff, 0xff, 0xff};
+const Color Color::RED{0xff, 0x00, 0x00};
+const Color Color::GREEN{0x00, 0xff, 0x00};
+const Color Color::BLUE{0x00, 0x00, 0xff};
+const Color Color::BLACK{0x00, 0x00, 0x00};
+const Color Color::CYAN{0x00, 0xff, 0xff};
+const Color Color::YELLOW{0xff, 0xff, 0x00};
+const Color Color::MAGENTA{0xff, 0x00, 0xff};
diff --git a/src/crepe/api/Color.h b/src/crepe/api/Color.h
index aa47bf4..84edb5c 100644
--- a/src/crepe/api/Color.h
+++ b/src/crepe/api/Color.h
@@ -4,41 +4,20 @@
 
 namespace crepe {
 
-// TODO: make Color a struct w/o constructors/destructors
-class Color {
-
-	// FIXME: can't these colors be defined as a `static constexpr const Color`
-	// instead?
-
-public:
-	Color(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha);
-	static const Color & get_white();
-	static const Color & get_red();
-	static const Color & get_green();
-	static const Color & get_blue();
-	static const Color & get_cyan();
-	static const Color & get_magenta();
-	static const Color & get_yellow();
-	static const Color & get_black();
-
-private:
-	// TODO: why are these private!?
-	uint8_t r;
-	uint8_t g;
-	uint8_t b;
-	uint8_t a;
-
-	static Color white;
-	static Color red;
-	static Color green;
-	static Color blue;
-	static Color cyan;
-	static Color magenta;
-	static Color yellow;
-	static Color black;
-
-private:
-	friend class SDLContext;
+struct Color {
+	uint8_t r = 0x00;
+	uint8_t g = 0x00;
+	uint8_t b = 0x00;
+	uint8_t a = 0xff;
+
+	static const Color WHITE;
+	static const Color RED;
+	static const Color GREEN;
+	static const Color BLUE;
+	static const Color CYAN;
+	static const Color MAGENTA;
+	static const Color YELLOW;
+	static const Color BLACK;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/Config.h b/src/crepe/api/Config.h
index 3ab877a..0c9d116 100644
--- a/src/crepe/api/Config.h
+++ b/src/crepe/api/Config.h
@@ -11,19 +11,18 @@ namespace crepe {
  * modified *before* execution is handed over from the game programmer to the engine (i.e. the
  * main loop is started).
  */
-class Config {
+class Config final {
 public:
 	//! Retrieve handle to global Config instance
 	static Config & get_instance();
 
 private:
 	Config() = default;
-
-	// singleton
-	Config(const Config &) = delete;
-	Config(Config &&) = delete;
-	Config & operator=(const Config &) = delete;
-	Config & operator=(Config &&) = delete;
+	~Config() = default;
+	Config(const Config &) = default;
+	Config(Config &&) = default;
+	Config & operator=(const Config &) = default;
+	Config & operator=(Config &&) = default;
 
 public:
 	//! Logging-related settings
@@ -62,6 +61,20 @@ public:
 		 */
 		double gravity = 1;
 	} physics;
+
+	//! Asset loading options
+	struct {
+		/**
+		 * \brief Pattern to match for Asset base directory
+		 *
+		 * All non-absolute paths resolved using \c Asset will be made relative to
+		 * the first parent directory relative to the calling executable where
+		 * appending this pattern results in a path that exists. If this string is
+		 * empty, path resolution is disabled, and Asset will return all paths
+		 * as-is.
+		 */
+		std::string root_pattern = ".crepe-root";
+	} asset;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/Event.h b/src/crepe/api/Event.h
index ef6a791..bac8701 100644
--- a/src/crepe/api/Event.h
+++ b/src/crepe/api/Event.h
@@ -1,23 +1,24 @@
 #pragma once
+// TODO discussing the location of these events
 
 #include <string>
 
 #include "KeyCodes.h"
 
+namespace crepe {
+
 /**
  * \brief Base class for all event types in the system.
  */
-class Event {
-public:
-};
+class Event {};
 
 /**
  * \brief Event triggered when a key is pressed.
  */
 class KeyPressEvent : public Event {
 public:
-	//! Number of times the key press is repeated (e.g., for long presses).
-	int repeat = 0;
+	//! false if first time press, true if key is repeated
+	bool repeat = false;
 
 	//! The key that was pressed.
 	Keycode key = Keycode::NONE;
@@ -96,11 +97,7 @@ public:
 /**
  * \brief Event triggered during a collision between objects.
  */
-class CollisionEvent : public Event {
-public:
-	//! Data describing the collision (currently not implemented).
-	// Collision collisionData;
-};
+class CollisionEvent : public Event {};
 
 /**
  * \brief Event triggered when text is submitted, e.g., from a text input.
@@ -118,14 +115,4 @@ class ShutDownEvent : public Event {
 public:
 };
 
-class MouseScrollEvent : public Event {
-public:
-	//! X-coordinate of the mouse position at the time of the event.
-	int scroll_x = 0;
-
-	//! Y-coordinate of the mouse position at the time of the event.
-	int scroll_y = 0;
-	
-	int direction = 0;
-};
-
+}
diff --git a/src/crepe/api/EventHandler.cpp b/src/crepe/api/EventHandler.cpp
index 186ec9c..4dc232f 100644
--- a/src/crepe/api/EventHandler.cpp
+++ b/src/crepe/api/EventHandler.cpp
@@ -2,5 +2,4 @@
 
 using namespace crepe;
 
-// Implementation of IEventHandlerWrapper::exec
-bool IEventHandlerWrapper::exec(const Event & e) { return call(e); }
+bool IEventHandlerWrapper::exec(const Event & e) { return this->call(e); }
diff --git a/src/crepe/api/EventHandler.h b/src/crepe/api/EventHandler.h
index db51d04..ef659fd 100644
--- a/src/crepe/api/EventHandler.h
+++ b/src/crepe/api/EventHandler.h
@@ -13,6 +13,8 @@ namespace crepe {
  * indicating whether the event is handled.
  * 
  * \tparam EventType The type of event this handler will handle.
+ * 
+ * Returning \c false from an event handler results in the event being propogated to other listeners for the same event type, while returning \c true stops propogation altogether.
  */
 template <typename EventType>
 using EventHandler = std::function<bool(const EventType & e)>;
@@ -22,7 +24,7 @@ using EventHandler = std::function<bool(const EventType & e)>;
  * \brief An abstract base class for event handler wrappers.
  * 
  * This class provides the interface for handling events. Derived classes must implement the
- * `call()` method to process events and the `get_type()` method to return the handler's type.
+ * `call()` method to process events
  */
 class IEventHandlerWrapper {
 public:
@@ -41,15 +43,6 @@ public:
      */
 	bool exec(const Event & e);
 
-	/**
-     * \brief Get the type of the event handler.
-     * 
-     * This method returns the type of the event handler as a string.
-     * 
-     * \return A string representing the handler's type.
-     */
-	virtual std::string get_type() const = 0;
-
 private:
 	/**
      * \brief The method responsible for handling the event.
@@ -94,20 +87,8 @@ private:
      * \return A boolean value indicating whether the event is handled.
      */
 	bool call(const Event & e) override;
-
-	/**
-     * \brief Returns the type of the handler.
-     * 
-     * This method returns a string representing the type of the event handler.
-     * 
-     * \return The handler type as a string.
-     */
-	std::string get_type() const override;
-
 	//! The event handler function.
-	EventHandler<EventType> m_handler;
-	//! The type name of the handler function.
-	const std::string m_handler_type;
+	EventHandler<EventType> handler;
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/EventHandler.hpp b/src/crepe/api/EventHandler.hpp
index 9c47da2..050e57e 100644
--- a/src/crepe/api/EventHandler.hpp
+++ b/src/crepe/api/EventHandler.hpp
@@ -1,3 +1,4 @@
+#pragma once
 
 #include <typeindex>
 
@@ -8,19 +9,12 @@ namespace crepe {
 // Implementation of EventHandlerWrapper constructor
 template <typename EventType>
 EventHandlerWrapper<EventType>::EventHandlerWrapper(const EventHandler<EventType> & handler)
-	: m_handler(handler),
-	  m_handler_type(m_handler.target_type().name()) {}
+	: handler(handler) {}
 
 // Implementation of EventHandlerWrapper::call
 template <typename EventType>
 bool EventHandlerWrapper<EventType>::call(const Event & e) {
-	return m_handler(static_cast<const EventType &>(e));
-}
-
-// Implementation of EventHandlerWrapper::get_type
-template <typename EventType>
-std::string EventHandlerWrapper<EventType>::get_type() const {
-	return m_handler_type;
+	return this->handler(static_cast<const EventType &>(e));
 }
 
 } //namespace crepe
diff --git a/src/crepe/api/EventManager.cpp b/src/crepe/api/EventManager.cpp
index b465e89..20f0dd3 100644
--- a/src/crepe/api/EventManager.cpp
+++ b/src/crepe/api/EventManager.cpp
@@ -1,6 +1,7 @@
 #include "EventManager.h"
 
 using namespace crepe;
+using namespace std;
 
 EventManager & EventManager::get_instance() {
 	static EventManager instance;
@@ -8,53 +9,38 @@ EventManager & EventManager::get_instance() {
 }
 
 void EventManager::dispatch_events() {
-	using HandlersMap
-		= std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>;
-	using HandlersVec = std::vector<std::unique_ptr<IEventHandlerWrapper>>;
-
-	for (auto event_it = this->events_queue.begin(); event_it != this->events_queue.end();) {
-		std::unique_ptr<Event> & event = std::get<0>(*event_it);
-		int channel = std::get<1>(*event_it);
-		std::type_index event_type = std::get<2>(*event_it);
-
-		bool event_handled = false;
-
-		if (channel) {
-			auto handlers_it = subscribers_by_event_id.find(event_type);
-			if (handlers_it != subscribers_by_event_id.end()) {
-				HandlersMap & handlers_map = handlers_it->second;
-				auto handlers = handlers_map.find(channel);
-				if (handlers != handlers_map.end()) {
-					HandlersVec & callbacks = handlers->second;
-					for (auto handler_it = callbacks.begin(); handler_it != callbacks.end();
-						 ++handler_it) {
-						if ((*handler_it)->exec(*event)) {
-							event_it = events_queue.erase(event_it);
-							event_handled = true;
-							break;
-						}
-					}
-				}
-			}
-		} else {
-			// Handle event for all channels
-			auto handlers_it = this->subscribers.find(event_type);
-			if (handlers_it != this->subscribers.end()) {
-				HandlersVec & handlers = handlers_it->second;
-				for (auto handler_it = handlers.begin(); handler_it != handlers.end();
-					 ++handler_it) {
-					// remove event from queue since and continue when callback returns true
-					if ((*handler_it)->exec(*event)) {
-						event_it = this->events_queue.erase(event_it);
-						event_handled = true;
-						break;
-					}
-				}
-			}
-		}
+	for (auto & event : this->events_queue) {
+		this->handle_event(event.type, event.channel, *event.event.get());
+	}
+	this->events_queue.clear();
+}
+
+void EventManager::handle_event(type_index type, event_channel_t channel, const Event & data) {
+	auto handlers_it = this->subscribers.find(type);
+	if (handlers_it == this->subscribers.end()) return;
+
+	vector<CallbackEntry> & handlers = handlers_it->second;
+	for (auto & handler : handlers) {
+		bool check_channel = handler.channel != CHANNEL_ALL || channel != CHANNEL_ALL;
+		if (check_channel && handler.channel != channel) continue;
+
+		bool handled = handler.callback->exec(data);
+		if (handled) return;
+	}
+}
+
+void EventManager::clear() {
+	this->subscribers.clear();
+	this->events_queue.clear();
+}
 
-		if (!event_handled) {
-			++event_it;
+void EventManager::unsubscribe(subscription_t id) {
+	for (auto & [event_type, handlers] : this->subscribers) {
+		for (auto it = handlers.begin(); it != handlers.end(); it++) {
+			// find listener with subscription id
+			if ((*it).id != id) continue;
+			it = handlers.erase(it);
+			return;
 		}
 	}
 }
diff --git a/src/crepe/api/EventManager.h b/src/crepe/api/EventManager.h
index 92273df..1a33023 100644
--- a/src/crepe/api/EventManager.h
+++ b/src/crepe/api/EventManager.h
@@ -1,8 +1,6 @@
 #pragma once
 
-#include <functional>
 #include <memory>
-#include <type_traits>
 #include <typeindex>
 #include <unordered_map>
 #include <vector>
@@ -12,98 +10,152 @@
 
 namespace crepe {
 
+//! Event listener unique ID
+typedef size_t subscription_t;
+
+/**
+ * \brief Event channel
+ *
+ * Events can be sent to a specific channel, which prevents listeners on other channels from
+ * being called. The default channel is EventManager::CHANNEL_ALL, which calls all listeners.
+ */
+typedef size_t event_channel_t;
+
 /**
  * \class EventManager
- * \brief The EventManager class is responsible for managing the subscription, triggering, 
- * and queueing of events. It handles events and dispatches them to appropriate subscribers.
+ * \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 {
 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 on the first call.
-     * 
-     * \return Reference to the EventManager instance.
-     */
+	 * \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.
+	 */
 	static EventManager & get_instance();
 
 	/**
-     * \brief Subscribe to an event.
-     * 
-     * This method allows the registration of a callback for a specific event type and channel.
-     * 
-     * \tparam EventType The type of the event to subscribe to.
-     * \param callback The callback function to invoke when the event is triggered.
-     * \param channel The channel number to subscribe to (default is 0).
-     */
+	 * \brief Subscribe to a specific event type.
+	 * 
+	 * Registers a callback for a given event type and optional channel. Each callback
+	 * is assigned a unique subscription ID that can be used for later unsubscription.
+	 * 
+	 * \tparam EventType The type of the event to subscribe to.
+	 * \param callback The callback function to be invoked when the event is triggered.
+	 * \param channel The channel number to subscribe to (default is CHANNEL_ALL, which listens to all channels).
+	 * \return A unique subscription ID associated with the registered callback.
+	 */
 	template <typename EventType>
-	void subscribe(EventHandler<EventType> && callback, int channel = 0);
+	subscription_t subscribe(const EventHandler<EventType> & callback,
+							 event_channel_t channel = CHANNEL_ALL);
 
 	/**
-     * \brief Unsubscribe from an event.
-     * 
-     * This method removes a previously registered callback from an event.
-     * 
-     * \tparam EventType The type of the event to unsubscribe from.
-     * \param callback The callback function to remove from the subscription list.
-     * \param channel The event ID to unsubscribe from.
-     */
-	template <typename EventType>
-	void unsubscribe(const EventHandler<EventType> &, int channel = 0);
+	 * \brief Unsubscribe a previously registered callback.
+	 * 
+	 * Removes a callback from the subscription list based on its unique subscription ID.
+	 * 
+	 * \param event_id The unique subscription ID of the callback to remove.
+	 */
+	void unsubscribe(subscription_t event_id);
 
 	/**
-     * \brief Trigger an event.
-     * 
-     * This method invokes the appropriate callback(s) for the specified event.
-     * 
-     * \tparam EventType The type of the event to trigger.
-     * \param event The event data to pass to the callback.
-     * \param channel The channel from which to trigger the event (default is 0).
-     */
+	 * \brief Trigger an event immediately.
+	 * 
+	 * Synchronously invokes all registered callbacks for the given event type on the specified channel.
+	 * 
+	 * \tparam EventType The type of the event to trigger.
+	 * \param event The event instance to pass to the callbacks.
+	 * \param channel The channel to trigger the event on (default is CHANNEL_ALL, which triggers on all channels).
+	 */
 	template <typename EventType>
-	void trigger_event(const EventType & event, int channel = 0);
+	void trigger_event(const EventType & event = {}, event_channel_t channel = CHANNEL_ALL);
 
 	/**
-     * \brief Queue an event for later processing.
-     * 
-     * This method adds an event to the event queue, which will be processed in the 
-     * dispatch_events function.
-     * 
-     * \tparam EventType The type of the event to queue.
-     * \param event The event to queue.
-     * \param channel The channel number for the event (default is 0).
-     */
+	 * \brief Queue an event for later processing.
+	 * 
+	 * Adds an event to the event queue to be processed during the next call to `dispatch_events`.
+	 * 
+	 * \tparam EventType The type of the event to queue.
+	 * \param event The event instance to queue.
+	 * \param channel The channel to associate with the event (default is CHANNEL_ALL).
+	 */
 	template <typename EventType>
-	void queue_event(EventType && event, int channel = 0);
+	void queue_event(const EventType & event = {}, event_channel_t channel = CHANNEL_ALL);
 
 	/**
-     * \brief Dispatch all queued events.
-     * 
-     * This method processes all events in the event queue and triggers the corresponding 
-     * callbacks for each event.
-     */
+	 * \brief Process all queued events.
+	 * 
+	 * Iterates through the event queue and triggers callbacks for each queued event.
+	 * Events are removed from the queue once processed.
+	 */
 	void dispatch_events();
 
+	/**
+	 * \brief Clear all subscriptions.
+	 * 
+	 * Removes all registered event handlers and clears the subscription list.
+	 */
+	void clear();
+
 private:
 	/**
-     * \brief Default constructor for the EventManager.
-     * 
-     * This constructor is private to enforce the singleton pattern.
-     */
+	 * \brief Default constructor for the EventManager.
+	 * 
+	 * Constructor is private to enforce the singleton pattern.
+	 */
 	EventManager() = default;
 
-	//! The queue of events to be processed.
-	std::vector<std::tuple<std::unique_ptr<Event>, int, std::type_index>> events_queue;
-	//! Registered event handlers.
-	std::unordered_map<std::type_index, std::vector<std::unique_ptr<IEventHandlerWrapper>>>
-		subscribers;
-	//! Event handlers indexed by event ID.
-	std::unordered_map<
-		std::type_index,
-		std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>>
-		subscribers_by_event_id;
+	/**
+	 * \struct QueueEntry
+	 * \brief Represents an entry in the event queue.
+	 */
+	struct QueueEntry {
+		std::unique_ptr<Event> event; ///< The event instance.
+		event_channel_t channel = CHANNEL_ALL; ///< The channel associated with the event.
+		std::type_index type; ///< The type of the event.
+	};
+
+	/**
+	 * \brief Internal event handler
+	 *
+	 * This function processes a single event, and is used to process events both during
+	 * EventManager::dispatch_events and inside EventManager::trigger_event
+	 *
+	 * \param type \c typeid of concrete Event class
+	 * \param channel Event channel
+	 * \param data Event data
+	 */
+	void handle_event(std::type_index type, event_channel_t channel, const Event & data);
+
+	/**
+	 * \struct CallbackEntry
+	 * \brief Represents a registered event handler callback.
+	 */
+	struct CallbackEntry {
+		std::unique_ptr<IEventHandlerWrapper> callback; ///< The callback function wrapper.
+		event_channel_t channel = CHANNEL_ALL; ///< The channel this callback listens to.
+		subscription_t id = -1; ///< Unique subscription ID.
+	};
+
+	//! The queue of events to be processed during dispatch.
+	std::vector<QueueEntry> events_queue;
+
+	//! A map of event type to registered callbacks.
+	std::unordered_map<std::type_index, std::vector<CallbackEntry>> subscribers;
+
+	//! Counter to generate unique subscription IDs.
+	subscription_t subscription_counter = 0;
 };
 
 } // namespace crepe
+
 #include "EventManager.hpp"
diff --git a/src/crepe/api/EventManager.hpp b/src/crepe/api/EventManager.hpp
index b20b88f..a5f4556 100644
--- a/src/crepe/api/EventManager.hpp
+++ b/src/crepe/api/EventManager.hpp
@@ -1,110 +1,36 @@
+#pragma once
+
 #include "EventManager.h"
 
 namespace crepe {
 
 template <typename EventType>
-void EventManager::subscribe(EventHandler<EventType> && callback, int channel) {
-	using HandlersMap
-		= std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>;
-	using HandlersVec = std::vector<std::unique_ptr<IEventHandlerWrapper>>;
-
+subscription_t EventManager::subscribe(const EventHandler<EventType> & callback,
+									   event_channel_t channel) {
+	subscription_counter++;
 	std::type_index event_type = typeid(EventType);
 	std::unique_ptr<EventHandlerWrapper<EventType>> handler
 		= std::make_unique<EventHandlerWrapper<EventType>>(callback);
-
-	if (channel) {
-		HandlersMap & handlers_map = this->subscribers_by_event_id[event_type];
-		auto handlers = handlers_map.find(channel);
-		if (handlers != handlers_map.end()) {
-			handlers->second.emplace_back(std::move(handler));
-		} else {
-			handlers_map[channel].emplace_back(std::move(handler));
-		}
-	} else {
-		HandlersVec & handlers = this->subscribers[event_type];
-		handlers.emplace_back(std::move(handler));
-	}
+	std::vector<CallbackEntry> & handlers = this->subscribers[event_type];
+	handlers.emplace_back(CallbackEntry{
+		.callback = std::move(handler), .channel = channel, .id = subscription_counter});
+	return subscription_counter;
 }
 
 template <typename EventType>
-void EventManager::queue_event(EventType && event, int channel) {
-	std::type_index event_type = std::type_index(typeid(EventType));
-
-	auto event_ptr = std::make_unique<EventType>(std::forward<EventType>(event));
-
-	std::tuple<std::unique_ptr<Event>, int, std::type_index> tuple(std::move(event_ptr),
-																   channel, event_type);
-	this->events_queue.push_back(std::move(tuple));
+void EventManager::queue_event(const EventType & event, event_channel_t channel) {
+	static_assert(std::is_base_of<Event, EventType>::value,
+				  "EventType must derive from Event");
+	this->events_queue.push_back(QueueEntry{
+		.event = std::make_unique<EventType>(event),
+		.channel = channel,
+		.type = typeid(EventType),
+	});
 }
 
 template <typename EventType>
-void EventManager::trigger_event(const EventType & event, int channel) {
-	using HandlersMap
-		= std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>;
-	using HandlersVec = std::vector<std::unique_ptr<IEventHandlerWrapper>>;
-
-	std::type_index event_type = std::type_index(typeid(EventType));
-
-	if (channel > 0) {
-		HandlersMap & handlers_map = this->subscribers_by_event_id[event_type];
-		auto handlers_it = handlers_map.find(channel);
-
-		if (handlers_it != handlers_map.end()) {
-			HandlersVec & handlers = handlers_it->second;
-			for (auto it = handlers.begin(); it != handlers.end(); ++it) {
-				// stops when callback returns true
-				if ((*it)->exec(event)) {
-					break;
-				}
-			}
-		}
-	} else {
-		HandlersVec & handlers = this->subscribers[event_type];
-		for (auto it = handlers.begin(); it != handlers.end(); ++it) {
-			// stops when callback returns true
-			if ((*it)->exec(event)) {
-				break;
-			}
-		}
-	}
-}
-
-template <typename EventType>
-void EventManager::unsubscribe(const EventHandler<EventType> & callback, int channel) {
-	using HandlersMap
-		= std::unordered_map<int, std::vector<std::unique_ptr<IEventHandlerWrapper>>>;
-	using HandlersVec = std::vector<std::unique_ptr<IEventHandlerWrapper>>;
-
-	std::type_index event_type(typeid(EventType));
-	std::string handler_name = callback.target_type().name();
-
-	if (channel) {
-		auto subscriber_list = this->subscribers_by_event_id.find(event_type);
-		if (subscriber_list != this->subscribers_by_event_id.end()) {
-			HandlersMap & handlers_map = subscriber_list->second;
-			auto handlers = handlers_map.find(channel);
-			if (handlers != handlers_map.end()) {
-				HandlersVec & callbacks = handlers->second;
-				for (auto it = callbacks.begin(); it != callbacks.end(); ++it) {
-					if ((*it)->get_type() == handler_name) {
-						it = callbacks.erase(it);
-						return;
-					}
-				}
-			}
-		}
-	} else {
-		auto handlers_it = this->subscribers.find(event_type);
-		if (handlers_it != this->subscribers.end()) {
-			HandlersVec & handlers = handlers_it->second;
-			for (auto it = handlers.begin(); it != handlers.end(); ++it) {
-				if ((*it)->get_type() == handler_name) {
-					it = handlers.erase(it);
-					return;
-				}
-			}
-		}
-	}
+void EventManager::trigger_event(const EventType & event, event_channel_t channel) {
+	this->handle_event(typeid(EventType), channel, event);
 }
 
 } // namespace crepe
diff --git a/src/crepe/api/GameObject.cpp b/src/crepe/api/GameObject.cpp
index 287e81d..3c36a21 100644
--- a/src/crepe/api/GameObject.cpp
+++ b/src/crepe/api/GameObject.cpp
@@ -9,7 +9,7 @@ using namespace std;
 
 GameObject::GameObject(ComponentManager & component_manager, game_object_id_t id,
 					   const std::string & name, const std::string & tag,
-					   const Vector2 & position, double rotation, double scale)
+					   const vec2 & position, double rotation, double scale)
 	: id(id),
 	  component_manager(component_manager) {
 
@@ -23,12 +23,10 @@ void GameObject::set_parent(const GameObject & parent) {
 	ComponentManager & mgr = this->component_manager;
 
 	// Set parent on own Metadata component
-	vector<reference_wrapper<Metadata>> this_metadata
-		= mgr.get_components_by_id<Metadata>(this->id);
+	RefVector<Metadata> this_metadata = mgr.get_components_by_id<Metadata>(this->id);
 	this_metadata.at(0).get().parent = parent.id;
 
 	// Add own id to children list of parent's Metadata component
-	vector<reference_wrapper<Metadata>> parent_metadata
-		= mgr.get_components_by_id<Metadata>(parent.id);
+	RefVector<Metadata> parent_metadata = mgr.get_components_by_id<Metadata>(parent.id);
 	parent_metadata.at(0).get().children.push_back(this->id);
 }
diff --git a/src/crepe/api/GameObject.h b/src/crepe/api/GameObject.h
index 34ef8bb..fcb8d9a 100644
--- a/src/crepe/api/GameObject.h
+++ b/src/crepe/api/GameObject.h
@@ -2,7 +2,6 @@
 
 #include <string>
 
-#include "Vector2.h"
 #include "types.h"
 
 namespace crepe {
@@ -30,7 +29,7 @@ private:
 	 * \param scale The scale of the GameObject
 	 */
 	GameObject(ComponentManager & component_manager, game_object_id_t id,
-			   const std::string & name, const std::string & tag, const Vector2 & position,
+			   const std::string & name, const std::string & tag, const vec2 & position,
 			   double rotation, double scale);
 	//! ComponentManager instances GameObject
 	friend class ComponentManager;
diff --git a/src/crepe/api/IKeyListener.cpp b/src/crepe/api/IKeyListener.cpp
index f5426be..8642655 100644
--- a/src/crepe/api/IKeyListener.cpp
+++ b/src/crepe/api/IKeyListener.cpp
@@ -2,65 +2,18 @@
 
 using namespace crepe;
 
-// Constructor with default channel
-IKeyListener::IKeyListener()
-	: channel(0),
-	  active(true),
-	  event_manager(EventManager::get_instance()) {
-	this->subscribe_events();
-}
-
 // Constructor with specified channel
-IKeyListener::IKeyListener(int channel)
-	: channel(channel),
-	  active(true),
-	  event_manager(EventManager::get_instance()) {
-	this->subscribe_events();
+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() { this->unsubscribe_events(); }
-
-// Subscribe to key events
-void IKeyListener::subscribe_events() {
-	key_pressed_handler
-		= [this](const KeyPressEvent & event) { return this->on_key_pressed(event); };
-	key_released_handler
-		= [this](const KeyReleaseEvent & event) { return this->on_key_released(event); };
-
-	event_manager.subscribe<KeyPressEvent>(std::move(this->key_pressed_handler),
-										   this->channel);
-	event_manager.subscribe<KeyReleaseEvent>(std::move(this->key_released_handler),
-											 this->channel);
-}
-
-// Unsubscribe from key events
-void IKeyListener::unsubscribe_events() {
-	event_manager.unsubscribe<KeyPressEvent>(this->key_pressed_handler, this->channel);
-	event_manager.unsubscribe<KeyReleaseEvent>(this->key_released_handler, this->channel);
-}
-
-// Activate key listening
-void IKeyListener::activate_keys() {
-	if (this->active) {
-		return;
-	}
-	this->active = true;
-	this->subscribe_events();
-}
-
-// Deactivate key listening
-void IKeyListener::deactivate_keys() {
-	if (!this->active) {
-		return;
-	}
-	this->active = false;
-	this->unsubscribe_events();
-}
-
-// Set a new channel for key events
-void IKeyListener::set_channel(int channel) {
-	this->unsubscribe_events();
-	this->channel = channel;
-	this->subscribe_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
index d492387..328a4c2 100644
--- a/src/crepe/api/IKeyListener.h
+++ b/src/crepe/api/IKeyListener.h
@@ -16,11 +16,11 @@ public:
      * \brief Constructs an IKeyListener with a specified channel.
      * \param channel The channel ID for event handling.
      */
-	IKeyListener(int channel);
-	IKeyListener();
+	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;
 
 	/**
@@ -37,42 +37,12 @@ public:
      */
 	virtual bool on_key_released(const KeyReleaseEvent & event) = 0;
 
-	/**
-     * \brief Activates key listening.
-     */
-	void activate_keys();
-
-	/**
-     * \brief Deactivates key listening.
-     */
-	void deactivate_keys();
-
-	/**
-     * \brief Sets the channel ID for event handling.
-     * \param channel The channel ID to set.
-     */
-	void set_channel(int channel);
-
-protected:
-	/**
-     * \brief Subscribes to key events.
-     */
-	void subscribe_events();
-
-	/**
-     * \brief Unsubscribes from key events.
-     */
-	void unsubscribe_events();
-
 private:
-	//! Indicates whether key listening is active.
-	bool active = true;
-	//! Channel ID for event handling.
-	int channel = 0;
-	//! Key press event handler.
-	EventHandler<KeyPressEvent> key_pressed_handler;
-	//!< Key release event handler.
-	EventHandler<KeyReleaseEvent> key_released_handler;
+	//! Key press event id
+	subscription_t press_id = -1;
+	//! Key release event id
+	subscription_t release_id = -1;
+	//! EventManager reference
 	EventManager & event_manager;
 };
 
diff --git a/src/crepe/api/IMouseListener.cpp b/src/crepe/api/IMouseListener.cpp
index 5ee2814..989aeb3 100644
--- a/src/crepe/api/IMouseListener.cpp
+++ b/src/crepe/api/IMouseListener.cpp
@@ -2,63 +2,28 @@
 
 using namespace crepe;
 
-IMouseListener::IMouseListener(int channel)
-	: event_manager(EventManager::get_instance()),
-	  channel(channel) {
-	this->subscribe_events();
+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() : event_manager(EventManager::get_instance()) {
-	this->subscribe_events();
-}
-
-IMouseListener::~IMouseListener() { this->unsubscribe_events(); }
-
-void IMouseListener::subscribe_events() {
-	// Define handler lambdas and subscribe them
-	mouse_click_handler
-		= [this](const MouseClickEvent & event) { return this->on_mouse_clicked(event); };
-	mouse_press_handler
-		= [this](const MousePressEvent & event) { return this->on_mouse_pressed(event); };
-	mouse_release_handler
-		= [this](const MouseReleaseEvent & event) { return this->on_mouse_released(event); };
-	mouse_move_handler
-		= [this](const MouseMoveEvent & event) { return this->on_mouse_moved(event); };
-
-	// Subscribe event handlers (no need for std::move)
-	event_manager.subscribe<MouseClickEvent>(std::move(mouse_click_handler), this->channel);
-	event_manager.subscribe<MousePressEvent>(std::move(mouse_press_handler), this->channel);
-	event_manager.subscribe<MouseReleaseEvent>(std::move(mouse_release_handler),
-											   this->channel);
-	event_manager.subscribe<MouseMoveEvent>(std::move(mouse_move_handler), this->channel);
-}
-
-void IMouseListener::unsubscribe_events() {
+IMouseListener::~IMouseListener() {
 	// Unsubscribe event handlers
-	event_manager.unsubscribe<MouseClickEvent>(mouse_click_handler, this->channel);
-	event_manager.unsubscribe<MousePressEvent>(mouse_press_handler, this->channel);
-	event_manager.unsubscribe<MouseReleaseEvent>(mouse_release_handler, this->channel);
-	event_manager.unsubscribe<MouseMoveEvent>(mouse_move_handler, this->channel);
-}
-
-void IMouseListener::activate_mouse() {
-	if (this->active) {
-		return;
-	}
-	this->subscribe_events();
-	this->active = true;
-}
-
-void IMouseListener::deactivate_mouse() {
-	if (!this->active) {
-		return;
-	}
-	this->unsubscribe_events();
-	this->active = false;
-}
-
-void IMouseListener::set_channel(int channel) {
-	this->unsubscribe_events();
-	this->channel = channel;
-	this->subscribe_events();
+	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
index c315c35..15e1619 100644
--- a/src/crepe/api/IMouseListener.h
+++ b/src/crepe/api/IMouseListener.h
@@ -12,15 +12,15 @@ namespace crepe {
  */
 class IMouseListener {
 public:
-	IMouseListener();
 	/**
      * \brief Constructs an IMouseListener with a specified channel.
      * \param channel The channel ID for event handling.
      */
-	IMouseListener(int channel);
+	IMouseListener(event_channel_t channel = EventManager::CHANNEL_ALL);
 	virtual ~IMouseListener();
-	IMouseListener(const IMouseListener &) = delete;
 	IMouseListener & operator=(const IMouseListener &) = delete;
+	IMouseListener(const IMouseListener &) = delete;
+	IMouseListener & operator=(const IMouseListener &&) = delete;
 	IMouseListener(IMouseListener &&) = delete;
 
 	/**
@@ -56,46 +56,16 @@ public:
      */
 	virtual bool on_mouse_moved(const MouseMoveEvent & event) = 0;
 
-	/**
-     * \brief Activates mouse listening.
-     */
-	void activate_mouse();
-
-	/**
-     * \brief Deactivates mouse listening.
-     */
-	void deactivate_mouse();
-
-	/**
-     * \brief Sets the channel ID for event handling.
-     * \param channel The channel ID to set.
-     */
-	void set_channel(int channel);
-
-protected:
-	/**
-     * \brief Subscribes to mouse events on the specified channel.
-     */
-	void subscribe_events();
-
-	/**
-     * \brief Unsubscribes from mouse events on the specified channel.
-     */
-	void unsubscribe_events();
-
 private:
-	//! Indicates whether mouse listening is active.
-	bool active = true;
-	//! Channel ID for event handling.
-	int channel = 0;
-	//! Mouse click event handler.
-	EventHandler<MouseClickEvent> mouse_click_handler;
-	//! Mouse press event handler.
-	EventHandler<MousePressEvent> mouse_press_handler;
-	//! Mouse release event handler.
-	EventHandler<MouseReleaseEvent> mouse_release_handler;
-	//! Mouse move event handler.
-	EventHandler<MouseMoveEvent> mouse_move_handler;
+	//! 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;
 };
 
diff --git a/src/crepe/api/KeyCodes.h b/src/crepe/api/KeyCodes.h
index feed0b2..9e173e0 100644
--- a/src/crepe/api/KeyCodes.h
+++ b/src/crepe/api/KeyCodes.h
@@ -1,170 +1,93 @@
 #pragma once
 
-//! \enum MouseButton
-//! \brief Enumeration for mouse button inputs, including standard and extended buttons.
+//! Enumeration for mouse button inputs, including standard and extended buttons.
 enum class MouseButton {
-	//! No mouse button input.
-	NONE = 0,
-	//! Left mouse button.
-	LEFT_MOUSE = 1,
-	//! Right mouse button.
-	RIGHT_MOUSE = 2,
-	//! Middle mouse button (scroll wheel press).
-	MIDDLE_MOUSE = 3,
-	//! First extended mouse button.
-	X1_MOUSE = 4,
-	//! Second extended mouse button.
-	X2_MOUSE = 5,
-	//! Scroll wheel upward movement.
-	SCROLL_UP = 6,
-	//! Scroll wheel downward movement.
-	SCROLL_DOWN = 7
+	NONE = 0, //!< No mouse button input.
+	LEFT_MOUSE = 1, //!< Left mouse button.
+	RIGHT_MOUSE = 2, //!< Right mouse button.
+	MIDDLE_MOUSE = 3, //!< Middle mouse button (scroll wheel press).
+	X1_MOUSE = 4, //!< First extended mouse button.
+	X2_MOUSE = 5, //!< Second extended mouse button.
+	SCROLL_UP = 6, //!< Scroll wheel upward movement.
+	SCROLL_DOWN = 7, //!< Scroll wheel downward movement.
 };
 
-//! \enum Keycode
-//! \brief Enumeration for keyboard key inputs, including printable characters, function keys, and keypad keys.
-enum class Keycode : int {
-	//! No key input.
-	NONE = 0,
-	//! Spacebar.
-	SPACE = 32,
-	//! Apostrophe (').
-	APOSTROPHE = 39,
-	//! Comma (,).
-	COMMA = 44,
-	//! Minus (-).
-	MINUS = 45,
-	//! Period (.).
-	PERIOD = 46,
-	//! Slash (/).
-	SLASH = 47,
-	//! Digit 0.
-	D0 = 48,
-	//! Digit 1.
-	D1 = 49,
-	//! Digit 2.
-	D2 = 50,
-	//! Digit 3.
-	D3 = 51,
-	//! Digit 4.
-	D4 = 52,
-	//! Digit 5.
-	D5 = 53,
-	//! Digit 6.
-	D6 = 54,
-	//! Digit 7.
-	D7 = 55,
-	//! Digit 8.
-	D8 = 56,
-	//! Digit 9.
-	D9 = 57,
-	//! Semicolon (;).
-	SEMICOLON = 59,
-	//! Equal sign (=).
-	EQUAL = 61,
-	//! Key 'A'.
-	A = 65,
-	//! Key 'B'.
-	B = 66,
-	//! Key 'C'.
-	C = 67,
-	//! Key 'D'.
-	D = 68,
-	//! Key 'E'.
-	E = 69,
-	//! Key 'F'.
-	F = 70,
-	//! Key 'G'.
-	G = 71,
-	//! Key 'H'.
-	H = 72,
-	//! Key 'I'.
-	I = 73,
-	//! Key 'J'.
-	J = 74,
-	//! Key 'K'.
-	K = 75,
-	//! Key 'L'.
-	L = 76,
-	//! Key 'M'.
-	M = 77,
-	//! Key 'N'.
-	N = 78,
-	//! Key 'O'.
-	O = 79,
-	//! Key 'P'.
-	P = 80,
-	//! Key 'Q'.
-	Q = 81,
-	//! Key 'R'.
-	R = 82,
-	//! Key 'S'.
-	S = 83,
-	//! Key 'T'.
-	T = 84,
-	//! Key 'U'.
-	U = 85,
-	//! Key 'V'.
-	V = 86,
-	//! Key 'W'.
-	W = 87,
-	//! Key 'X'.
-	X = 88,
-	//! Key 'Y'.
-	Y = 89,
-	//! Key 'Z'.
-	Z = 90,
-	//! Left bracket ([).
-	LEFT_BRACKET = 91,
-	//! Backslash (\).
-	BACKSLASH = 92,
-	//! Right bracket (]).
-	RIGHT_BRACKET = 93,
-	//! Grave accent (`).
-	GRAVE_ACCENT = 96,
-	//! Non-US key #1.
-	WORLD1 = 161,
-	//! Non-US key #2.
-	WORLD2 = 162,
-	//! Escape key.
-	ESCAPE = 256,
-	//! Enter key.
-	ENTER = 257,
-	//! Tab key.
-	TAB = 258,
-	//! Backspace key.
-	BACKSPACE = 259,
-	//! Insert key.
-	INSERT = 260,
-	//! Delete key.
-	DELETE = 261,
-	//! Right arrow key.
-	RIGHT = 262,
-	//! Left arrow key.
-	LEFT = 263,
-	//! Down arrow key.
-	DOWN = 264,
-	//! Up arrow key.
-	UP = 265,
-	//! Page Up key.
-	PAGE_UP = 266,
-	//! Page Down key.
-	PAGE_DOWN = 267,
-	//! Home key.
-	HOME = 268,
-	//! End key.
-	END = 269,
-	//! Caps Lock key.
-	CAPS_LOCK = 280,
-	//! Scroll Lock key.
-	SCROLL_LOCK = 281,
-	//! Num Lock key.
-	NUM_LOCK = 282,
-	//! Print Screen key.
-	PRINT_SCREEN = 283,
-	//! Pause key.
-	PAUSE = 284,
-	//! Function keys (F1-F25).
+//! Enumeration for keyboard key inputs, including printable characters, function keys, and keypad keys.
+enum class Keycode {
+	NONE = 0, //!< No key input.
+	SPACE = 32, //!< Spacebar.
+	APOSTROPHE = 39, //!< Apostrophe (').
+	COMMA = 44, //!< Comma (,).
+	MINUS = 45, //!< Minus (-).
+	PERIOD = 46, //!< Period (.).
+	SLASH = 47, //!< Slash (/).
+	D0 = 48, //!< Digit 0.
+	D1 = 49, //!< Digit 1.
+	D2 = 50, //!< Digit 2.
+	D3 = 51, //!< Digit 3.
+	D4 = 52, //!< Digit 4.
+	D5 = 53, //!< Digit 5.
+	D6 = 54, //!< Digit 6.
+	D7 = 55, //!< Digit 7.
+	D8 = 56, //!< Digit 8.
+	D9 = 57, //!< Digit 9.
+	SEMICOLON = 59, //!< Semicolon (;).
+	EQUAL = 61, //!< Equal sign (=).
+	A = 65, //!< Key 'A'.
+	B = 66, //!< Key 'B'.
+	C = 67, //!< Key 'C'.
+	D = 68, //!< Key 'D'.
+	E = 69, //!< Key 'E'.
+	F = 70, //!< Key 'F'.
+	G = 71, //!< Key 'G'.
+	H = 72, //!< Key 'H'.
+	I = 73, //!< Key 'I'.
+	J = 74, //!< Key 'J'.
+	K = 75, //!< Key 'K'.
+	L = 76, //!< Key 'L'.
+	M = 77, //!< Key 'M'.
+	N = 78, //!< Key 'N'.
+	O = 79, //!< Key 'O'.
+	P = 80, //!< Key 'P'.
+	Q = 81, //!< Key 'Q'.
+	R = 82, //!< Key 'R'.
+	S = 83, //!< Key 'S'.
+	T = 84, //!< Key 'T'.
+	U = 85, //!< Key 'U'.
+	V = 86, //!< Key 'V'.
+	W = 87, //!< Key 'W'.
+	X = 88, //!< Key 'X'.
+	Y = 89, //!< Key 'Y'.
+	Z = 90, //!< Key 'Z'.
+	LEFT_BRACKET = 91, //!< Left bracket ([).
+	BACKSLASH = 92, //!< Backslash (\).
+	RIGHT_BRACKET = 93, //!< Right bracket (]).
+	GRAVE_ACCENT = 96, //!< Grave accent (`).
+	WORLD1 = 161, //!< Non-US key #1.
+	WORLD2 = 162, //!< Non-US key #2.
+	ESCAPE = 256, //!< Escape key.
+	ENTER = 257, //!< Enter key.
+	TAB = 258, //!< Tab key.
+	BACKSPACE = 259, //!< Backspace key.
+	INSERT = 260, //!< Insert key.
+	DELETE = 261, //!< Delete key.
+	RIGHT = 262, //!< Right arrow key.
+	LEFT = 263, //!< Left arrow key.
+	DOWN = 264, //!< Down arrow key.
+	UP = 265, //!< Up arrow key.
+	PAGE_UP = 266, //!< Page Up key.
+	PAGE_DOWN = 267, //!< Page Down key.
+	HOME = 268, //!< Home key.
+	END = 269, //!< End key.
+	CAPS_LOCK = 280, //!< Caps Lock key.
+	SCROLL_LOCK = 281, //!< Scroll Lock key.
+	NUM_LOCK = 282, //!< Num Lock key.
+	PRINT_SCREEN = 283, //!< Print Screen key.
+	PAUSE = 284, //!< Pause key.
+	/**
+	 * \name Function keys (F1-F25).
+	 * \{
+	 */
 	F1 = 290,
 	F2 = 291,
 	F3 = 292,
@@ -190,7 +113,11 @@ enum class Keycode : int {
 	F23 = 312,
 	F24 = 313,
 	F25 = 314,
-	//! Keypad digits and operators.
+	/// \}
+	/**
+	 * \name Keypad digits and operators.
+	 * \{
+	 */
 	KP0 = 320,
 	KP1 = 321,
 	KP2 = 322,
@@ -208,7 +135,11 @@ enum class Keycode : int {
 	KP_ADD = 334,
 	KP_ENTER = 335,
 	KP_EQUAL = 336,
-	//! Modifier keys.
+	/// \}
+	/**
+	 * \name Modifier keys.
+	 * \{
+	 */
 	LEFT_SHIFT = 340,
 	LEFT_CONTROL = 341,
 	LEFT_ALT = 342,
@@ -217,6 +148,6 @@ enum class Keycode : int {
 	RIGHT_CONTROL = 345,
 	RIGHT_ALT = 346,
 	RIGHT_SUPER = 347,
-	//! Menu key.
-	MENU = 348
+	/// \}
+	MENU = 348, //!< Menu key.
 };
diff --git a/src/crepe/api/LoopManager.cpp b/src/crepe/api/LoopManager.cpp
index af306c0..9599943 100644
--- a/src/crepe/api/LoopManager.cpp
+++ b/src/crepe/api/LoopManager.cpp
@@ -59,7 +59,7 @@ void LoopManager::loop() {
 void LoopManager::setup() {
 	this->game_running = true;
 	LoopTimer::get_instance().start();
-	LoopTimer::get_instance().set_fps(60);
+	LoopTimer::get_instance().set_fps(200);
 }
 
 void LoopManager::render() {
diff --git a/src/crepe/api/LoopManager.h b/src/crepe/api/LoopManager.h
index b18c9d1..13e6dac 100644
--- a/src/crepe/api/LoopManager.h
+++ b/src/crepe/api/LoopManager.h
@@ -4,19 +4,27 @@
 
 #include "../ComponentManager.h"
 #include "../system/System.h"
+#include "api/SceneManager.h"
 
 namespace crepe {
 
+/**
+ * \brief Main game loop manager
+ *
+ * This class is responsible for managing the game loop, including initialization and updating.
+ */
 class LoopManager {
 public:
 	void start();
+	LoopManager();
+
 	/**
-	 * \brief Set game running variable
+	 * \brief Add a new concrete scene to the scene manager
 	 *
-	 * \param running running (false = game shutdown, true = game running)
+	 * \tparam T  Type of concrete scene
 	 */
-	void set_running(bool running);
-	LoopManager();
+	template <typename T>
+	void add_scene();
 
 private:
 	/**
@@ -59,7 +67,14 @@ private:
 	 * 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.
 	 *
@@ -72,6 +87,8 @@ private:
 private:
 	//! Component manager instance
 	ComponentManager component_manager{};
+	//! Scene manager instance
+	SceneManager scene_manager{component_manager};
 
 private:
 	/**
diff --git a/src/crepe/api/LoopManager.hpp b/src/crepe/api/LoopManager.hpp
index 0b14fdb..9cf470b 100644
--- a/src/crepe/api/LoopManager.hpp
+++ b/src/crepe/api/LoopManager.hpp
@@ -11,6 +11,11 @@
 namespace crepe {
 
 template <class T>
+void LoopManager::add_scene() {
+	this->scene_manager.add_scene<T>();
+}
+
+template <class T>
 T & LoopManager::get_system() {
 	using namespace std;
 	static_assert(is_base_of<System, T>::value,
diff --git a/src/crepe/api/LoopTimer.cpp b/src/crepe/api/LoopTimer.cpp
index a9800b7..15a0e3a 100644
--- a/src/crepe/api/LoopTimer.cpp
+++ b/src/crepe/api/LoopTimer.cpp
@@ -47,7 +47,7 @@ double LoopTimer::get_fixed_delta_time() const { return this->fixed_delta_time.c
 void LoopTimer::set_fps(int fps) {
 	this->fps = fps;
 	// target time per frame in seconds
-	this->frame_target_time = std::chrono::seconds(1) / fps;
+	this->frame_target_time = std::chrono::duration<double>(1.0) / fps;
 }
 
 int LoopTimer::get_fps() const { return this->fps; }
diff --git a/src/crepe/api/LoopTimer.h b/src/crepe/api/LoopTimer.h
index f277d7b..9393439 100644
--- a/src/crepe/api/LoopTimer.h
+++ b/src/crepe/api/LoopTimer.h
@@ -130,9 +130,9 @@ private:
 	//! 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::seconds(1) / fps;
+	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::seconds(1) / 50;
+	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
diff --git a/src/crepe/api/ParticleEmitter.h b/src/crepe/api/ParticleEmitter.h
index 33112e1..b83fd61 100644
--- a/src/crepe/api/ParticleEmitter.h
+++ b/src/crepe/api/ParticleEmitter.h
@@ -4,7 +4,7 @@
 
 #include "Component.h"
 #include "Particle.h"
-#include "Vector2.h"
+#include "types.h"
 
 namespace crepe {
 
@@ -30,7 +30,7 @@ public:
 		//! boundary height (midpoint is emitter location)
 		double height = 0.0;
 		//! boundary offset from particle emitter location
-		Vector2 offset;
+		vec2 offset;
 		//! reset on exit or stop velocity and set max postion
 		bool reset_on_exit = false;
 	};
@@ -43,7 +43,7 @@ public:
 	 */
 	struct Data {
 		//! position of the emitter
-		Vector2 position;
+		vec2 position;
 		//! maximum number of particles
 		const unsigned int max_particles = 0;
 		//! rate of particle emission per update (Lowest value = 0.001 any lower is ignored)
@@ -61,7 +61,7 @@ public:
 		//! end Lifespan of particle
 		double end_lifespan = 0.0;
 		//! force over time (physics)
-		Vector2 force_over_time;
+		vec2 force_over_time;
 		//! particle boundary
 		Boundary boundary;
 		//! collection of particles
diff --git a/src/crepe/api/Rigidbody.cpp b/src/crepe/api/Rigidbody.cpp
index 6b87695..576ca45 100644
--- a/src/crepe/api/Rigidbody.cpp
+++ b/src/crepe/api/Rigidbody.cpp
@@ -6,7 +6,7 @@ crepe::Rigidbody::Rigidbody(game_object_id_t id, const Data & data)
 	: Component(id),
 	  data(data) {}
 
-void crepe::Rigidbody::add_force_linear(const Vector2 & force) {
+void crepe::Rigidbody::add_force_linear(const vec2 & force) {
 	this->data.linear_velocity += force;
 }
 
diff --git a/src/crepe/api/Rigidbody.h b/src/crepe/api/Rigidbody.h
index 3e5c7a3..3b0588f 100644
--- a/src/crepe/api/Rigidbody.h
+++ b/src/crepe/api/Rigidbody.h
@@ -2,7 +2,7 @@
 
 #include "../Component.h"
 
-#include "Vector2.h"
+#include "types.h"
 
 namespace crepe {
 
@@ -56,11 +56,11 @@ public:
 		//! Changes if physics apply
 		BodyType body_type = BodyType::DYNAMIC;
 		//! linear velocity of object
-		Vector2 linear_velocity;
+		vec2 linear_velocity;
 		//! maximum linear velocity of object
-		Vector2 max_linear_velocity;
+		vec2 max_linear_velocity;
 		//! linear damping of object
-		Vector2 linear_damping;
+		vec2 linear_damping;
 		//! angular velocity of object
 		double angular_velocity = 0.0;
 		//! max angular velocity of object
@@ -90,7 +90,7 @@ public:
 	 * 
 	 * \param force Vector2 that is added to the linear force.
 	 */
-	void add_force_linear(const Vector2 & force);
+	void add_force_linear(const vec2 & force);
 	/** 
 	 * \brief add a angular force to the Rigidbody.
 	 * 
diff --git a/src/crepe/api/Scene.cpp b/src/crepe/api/Scene.cpp
deleted file mode 100644
index 88aa82d..0000000
--- a/src/crepe/api/Scene.cpp
+++ /dev/null
@@ -1,7 +0,0 @@
-#include "Scene.h"
-
-using namespace crepe;
-
-Scene::Scene(ComponentManager & mgr, const std::string & name)
-	: component_manager(mgr),
-	  name(name) {}
diff --git a/src/crepe/api/Scene.h b/src/crepe/api/Scene.h
index 0e516b6..f6fdb2a 100644
--- a/src/crepe/api/Scene.h
+++ b/src/crepe/api/Scene.h
@@ -2,25 +2,53 @@
 
 #include <string>
 
+#include "../util/OptionalRef.h"
+
 namespace crepe {
 
 class SceneManager;
 class ComponentManager;
 
+/**
+ * \brief Represents a Scene
+ * 
+ * This class represents a Scene. The Scene class is only used as an interface for the game
+ * programmer.
+ */
 class Scene {
 protected:
-	Scene(ComponentManager & mgr, const std::string & name);
+	// NOTE: This must be the only constructor on Scene, see "Late references" below
+	Scene() = default;
+	//! SceneManager instances Scene
 	friend class SceneManager;
 
 public:
 	virtual ~Scene() = default;
 
 public:
+	//! Load the scene
 	virtual void load_scene() = 0;
-	const std::string name;
+	/**
+	 * \brief Get the scene's name
+	 * \return The scene's name
+	 */
+	virtual std::string get_name() const = 0;
 
 protected:
-	ComponentManager & component_manager;
+	/**
+	 * \name Late references
+	 * 
+	 * These references are set by SceneManager immediately after calling the constructor of Scene.
+	 *
+	 * \note Scene must have a constructor without arguments so the game programmer doesn't need to
+	 * manually add `using Scene::Scene` to their concrete scene class, if they want to add a
+	 * constructor with arguments (e.g. for passing references to their own concrete Scene classes).
+	 *
+	 * \{
+	 */
+	//! Reference to the ComponentManager
+	OptionalRef<ComponentManager> component_manager;
+	//! \}
 };
 
 } // namespace crepe
diff --git a/src/crepe/api/SceneManager.cpp b/src/crepe/api/SceneManager.cpp
index 7fb5cb0..1f783ad 100644
--- a/src/crepe/api/SceneManager.cpp
+++ b/src/crepe/api/SceneManager.cpp
@@ -18,7 +18,7 @@ void SceneManager::load_next_scene() {
 
 	auto it = find_if(this->scenes.begin(), this->scenes.end(),
 					  [&next_scene = this->next_scene](unique_ptr<Scene> & scene) {
-						  return scene->name == next_scene;
+						  return scene.get()->get_name() == next_scene;
 					  });
 
 	// next scene not found
diff --git a/src/crepe/api/SceneManager.h b/src/crepe/api/SceneManager.h
index e854794..f6f62cd 100644
--- a/src/crepe/api/SceneManager.h
+++ b/src/crepe/api/SceneManager.h
@@ -1,7 +1,6 @@
 #pragma once
 
 #include <memory>
-#include <queue>
 #include <vector>
 
 #include "Scene.h"
@@ -10,8 +9,15 @@ namespace crepe {
 
 class ComponentManager;
 
+/**
+ * \brief Manages scenes
+ *
+ * This class manages scenes. It can add new scenes and load them. It also manages the current scene
+ * and the next scene.
+ */
 class SceneManager {
 public:
+	//! \param mgr  Reference to the ComponentManager
 	SceneManager(ComponentManager & mgr);
 
 public:
@@ -19,10 +25,9 @@ public:
 	 * \brief Add a new concrete scene to the scene manager
 	 *
 	 * \tparam T  Type of concrete scene
-	 * \param name  Name of new scene
 	 */
-	template <typename T>
-	void add_scene(const std::string & name);
+	template <typename T, typename... Args>
+	void add_scene(Args &&... args);
 	/**
 	 * \brief Set the next scene
 	 *
@@ -35,8 +40,11 @@ public:
 	void load_next_scene();
 
 private:
+	//! Vector of concrete scenes (added by add_scene())
 	std::vector<std::unique_ptr<Scene>> scenes;
+	//! Next scene to load
 	std::string next_scene;
+	//! Reference to the ComponentManager
 	ComponentManager & component_manager;
 };
 
diff --git a/src/crepe/api/SceneManager.hpp b/src/crepe/api/SceneManager.hpp
index 714f690..5c8e417 100644
--- a/src/crepe/api/SceneManager.hpp
+++ b/src/crepe/api/SceneManager.hpp
@@ -4,17 +4,21 @@
 
 namespace crepe {
 
-template <typename T>
-void SceneManager::add_scene(const std::string & name) {
+template <typename T, typename... Args>
+void SceneManager::add_scene(Args &&... args) {
 	using namespace std;
 	static_assert(is_base_of<Scene, T>::value, "T must be derived from Scene");
 
-	Scene * scene = new T(this->component_manager, name);
-	this->scenes.emplace_back(unique_ptr<Scene>(scene));
+	Scene * scene = new T(std::forward<Args>(args)...);
+	unique_ptr<Scene> unique_scene(scene);
+
+	unique_scene->component_manager = this->component_manager;
+
+	this->scenes.emplace_back(std::move(unique_scene));
 
 	// The first scene added, is the one that will be loaded at the beginning
 	if (next_scene.empty()) {
-		next_scene = name;
+		next_scene = scene->get_name();
 	}
 }
 
diff --git a/src/crepe/api/Script.cpp b/src/crepe/api/Script.cpp
new file mode 100644
index 0000000..fcbe4c7
--- /dev/null
+++ b/src/crepe/api/Script.cpp
@@ -0,0 +1,15 @@
+#include "Script.h"
+
+using namespace crepe;
+
+Script::~Script() {
+	EventManager & evmgr = this->event_manager;
+	for (auto id : this->listeners) {
+		evmgr.unsubscribe(id);
+	}
+}
+
+template <>
+void Script::subscribe(const EventHandler<CollisionEvent> & callback) {
+	this->subscribe_internal(callback, this->game_object_id);
+}
diff --git a/src/crepe/api/Script.h b/src/crepe/api/Script.h
index 2b70379..a0870cb 100644
--- a/src/crepe/api/Script.h
+++ b/src/crepe/api/Script.h
@@ -3,6 +3,9 @@
 #include <vector>
 
 #include "../types.h"
+#include "../util/OptionalRef.h"
+
+#include "EventManager.h"
 
 namespace crepe {
 
@@ -16,13 +19,23 @@ class ComponentManager;
  * This class is used as a base class for user-defined scripts that can be added to game
  * objects using the \c BehaviorScript component.
  *
- * \note Additional *events* (like Unity's OnDisable and OnEnable) should be implemented as
+ * \info Additional *events* (like Unity's OnDisable and OnEnable) should be implemented as
  * member or lambda methods in derivative user script classes and registered in \c init().
+ *
+ * \warning Concrete scripts are allowed do create a custom constructor, but the utility
+ * functions should not be called inside the constructor as they rely on late references that
+ * are only available after the constructor returns.
+ *
+ * \see feature_script
  */
 class Script {
 protected:
 	/**
-	 * \brief Script initialization function
+	 * \name Interface functions
+	 * \{
+	 */
+	/**
+	 * \brief Script initialization function (empty by default)
 	 *
 	 * This function is called during the ScriptSystem::update() routine *before*
 	 * Script::update() if it (a) has not yet been called and (b) the \c BehaviorScript component
@@ -30,24 +43,31 @@ protected:
 	 */
 	virtual void init() {}
 	/**
-	 * \brief Script update function
+	 * \brief Script update function (empty by default)
 	 *
 	 * This function is called during the ScriptSystem::update() routine if the \c BehaviorScript
 	 * component holding this script instance is active.
 	 */
 	virtual void update() {}
+	//! \}
+
 	//! ScriptSystem calls \c init() and \c update()
 	friend class crepe::ScriptSystem;
 
 protected:
 	/**
-	 * \brief Get single component of type \c T on this game object (utility)
+	 * \name Utility functions
+	 * \{
+	 */
+
+	/**
+	 * \brief Get single component of type \c T on this game object
 	 *
 	 * \tparam T Type of component
 	 *
 	 * \returns Reference to component
 	 *
-	 * \throws nullptr if this game object does not have a component matching type \c T
+	 * \throws std::runtime_error if this game object does not have a component with type \c T
 	 */
 	template <typename T>
 	T & get_component() const;
@@ -55,34 +75,117 @@ protected:
 	// cause compile-time errors
 
 	/**
-	 * \brief Get all components of type \c T on this game object (utility)
+	 * \brief Get all components of type \c T on this game object
 	 *
 	 * \tparam T Type of component
 	 *
 	 * \returns List of component references
 	 */
 	template <typename T>
-	std::vector<std::reference_wrapper<T>> get_components() const;
+	RefVector<T> get_components() const;
+
+	/**
+	 * \brief Log a message using Log::logf
+	 *
+	 * \tparam Args Log::logf parameters
+	 * \param args  Log::logf parameters
+	 */
+	template <typename... Args>
+	void logf(Args &&... args);
+
+	/**
+	 * \brief Subscribe to an event with an explicit channel
+	 * \see EventManager::subscribe
+	 */
+	template <typename EventType>
+	void subscribe(const EventHandler<EventType> & callback, event_channel_t channel);
+	/**
+	 * \brief Subscribe to an event on EventManager::CHANNEL_ALL
+	 * \see EventManager::subscribe
+	 */
+	template <typename EventType>
+	void subscribe(const EventHandler<EventType> & callback);
+
+	//! \}
+
+private:
+	/**
+	 * \brief Internal subscribe function
+	 *
+	 * This function exists so certain template specializations of Script::subscribe can be
+	 * explicitly deleted, and does the following:
+	 * - Wrap the user-provided callback in a check that tests if the parent BehaviorScript
+	 *   component is still active
+	 * - Store the subscriber handle returned by the event manager so this listener is
+	 *   automatically unsubscribed at the end of this Script instance's life
+	 *
+	 * \tparam EventType concrete Event class
+	 * \param callback User-provided callback function
+	 * \param channel Event channel (may have been overridden by template specializations)
+	 */
+	template <typename EventType>
+	void subscribe_internal(const EventHandler<EventType> & callback, event_channel_t channel);
 
 protected:
-	// NOTE: Script must have a constructor without arguments so the game programmer doesn't need
-	// to manually add `using Script::Script` to their concrete script class.
+	// NOTE: This must be the only constructor on Script, see "Late references" below
 	Script() = default;
 	//! Only \c BehaviorScript instantiates Script
 	friend class BehaviorScript;
 
+public:
+	// std::unique_ptr destroys script
+	virtual ~Script();
+
+private:
+	Script(const Script &) = delete;
+	Script(Script &&) = delete;
+	Script & operator=(const Script &) = delete;
+	Script & operator=(Script &&) = delete;
+
 private:
-	// These references are set by BehaviorScript immediately after calling the constructor of
-	// Script.
-	game_object_id_t game_object_id = -1;
-	ComponentManager * component_manager_ref = nullptr;
-	// TODO: use OptionalRef instead of pointer
+	/**
+	 * \name Late references
+	 *
+	 * These references are set by BehaviorScript immediately after calling the constructor of
+	 * Script.
+	 *
+	 * \note Script must have a constructor without arguments so the game programmer doesn't need
+	 * to manually add `using Script::Script` to their concrete script class if they want to
+	 * implement a non-default constructor (e.g. for passing references to their own concrete
+	 * Script classes).
+	 *
+	 * \{
+	 */
+	//! Game object ID of game object parent BehaviorScript is attached to
+	game_object_id_t game_object_id;
+	//! Reference to parent component
+	OptionalRef<bool> active;
+	//! Reference to component manager instance
+	OptionalRef<ComponentManager> component_manager;
+	//! Reference to event manager instance
+	OptionalRef<EventManager> event_manager;
+	//! \}
 
 private:
 	//! Flag to indicate if \c init() has been called already
 	bool initialized = false;
+	//! List of subscribed events
+	std::vector<subscription_t> listeners;
 };
 
+/**
+ * \brief Subscribe to CollisionEvent for the current GameObject
+ *
+ * This is a template specialization for Script::subscribe which automatically sets the event
+ * channel so the callback handler is only called for CollisionEvent events that apply to the
+ * current GameObject the parent BehaviorScript is attached to.
+ */
+template <>
+void Script::subscribe(const EventHandler<CollisionEvent> & callback);
+template <>
+void Script::subscribe(const EventHandler<CollisionEvent> & callback, event_channel_t)
+	= delete;
+
 } // namespace crepe
 
 #include "Script.hpp"
diff --git a/src/crepe/api/Script.hpp b/src/crepe/api/Script.hpp
index a064a90..a2463bf 100644
--- a/src/crepe/api/Script.hpp
+++ b/src/crepe/api/Script.hpp
@@ -10,7 +10,7 @@ namespace crepe {
 template <typename T>
 T & Script::get_component() const {
 	using namespace std;
-	vector<reference_wrapper<T>> all_components = this->get_components<T>();
+	RefVector<T> all_components = this->get_components<T>();
 	if (all_components.size() < 1)
 		throw runtime_error(
 			format("Script: no component found with type = {}", typeid(T).name()));
@@ -19,10 +19,39 @@ T & Script::get_component() const {
 }
 
 template <typename T>
-std::vector<std::reference_wrapper<T>> Script::get_components() const {
-	auto & mgr = *this->component_manager_ref;
+RefVector<T> Script::get_components() const {
+	ComponentManager & mgr = this->component_manager;
 
 	return mgr.get_components_by_id<T>(this->game_object_id);
 }
 
+template <typename... Args>
+void Script::logf(Args &&... args) {
+	Log::logf(std::forward<Args>(args)...);
+}
+
+template <typename EventType>
+void Script::subscribe_internal(const EventHandler<EventType> & callback,
+								event_channel_t channel) {
+	EventManager & mgr = this->event_manager;
+	subscription_t listener = mgr.subscribe<EventType>(
+		[this, callback](const EventType & data) -> bool {
+			bool & active = this->active;
+			if (!active) return false;
+			return callback(data);
+		},
+		channel);
+	this->listeners.push_back(listener);
+}
+
+template <typename EventType>
+void Script::subscribe(const EventHandler<EventType> & callback, event_channel_t channel) {
+	this->subscribe_internal(callback, channel);
+}
+
+template <typename EventType>
+void Script::subscribe(const EventHandler<EventType> & callback) {
+	this->subscribe_internal(callback, EventManager::CHANNEL_ALL);
+}
+
 } // namespace crepe
diff --git a/src/crepe/api/Sprite.h b/src/crepe/api/Sprite.h
index 0192793..74a55d4 100644
--- a/src/crepe/api/Sprite.h
+++ b/src/crepe/api/Sprite.h
@@ -2,8 +2,9 @@
 
 #include <memory>
 
+#include "../Component.h"
+
 #include "Color.h"
-#include "Component.h"
 #include "Texture.h"
 
 namespace crepe {
diff --git a/src/crepe/api/Texture.cpp b/src/crepe/api/Texture.cpp
index de0d0ea..264d7b1 100644
--- a/src/crepe/api/Texture.cpp
+++ b/src/crepe/api/Texture.cpp
@@ -9,14 +9,9 @@
 using namespace crepe;
 using namespace std;
 
-Texture::Texture(unique_ptr<Asset> res) {
+Texture::Texture(const Asset & src) {
 	dbg_trace();
-	this->load(std::move(res));
-}
-
-Texture::Texture(const char * src) {
-	dbg_trace();
-	this->load(make_unique<Asset>(src));
+	this->load(src);
 }
 
 Texture::~Texture() {
@@ -24,9 +19,9 @@ Texture::~Texture() {
 	this->texture.reset();
 }
 
-void Texture::load(unique_ptr<Asset> res) {
+void Texture::load(const Asset & res) {
 	SDLContext & ctx = SDLContext::get_instance();
-	this->texture = std::move(ctx.texture_from_path(res->get_canonical()));
+	this->texture = ctx.texture_from_path(res.get_path());
 }
 
 int Texture::get_width() const {
@@ -35,5 +30,5 @@ int Texture::get_width() const {
 }
 int Texture::get_height() const {
 	if (this->texture == nullptr) return 0;
-	return SDLContext::get_instance().get_width(*this);
+	return SDLContext::get_instance().get_height(*this);
 }
diff --git a/src/crepe/api/Texture.h b/src/crepe/api/Texture.h
index 6965223..b4f7d07 100644
--- a/src/crepe/api/Texture.h
+++ b/src/crepe/api/Texture.h
@@ -25,16 +25,10 @@ class Texture {
 
 public:
 	/**
-	 * \brief Constructs a Texture from a file path.
-	 * \param src Path to the image file to be loaded as a texture.
-	 */
-	Texture(const char * src);
-
-	/**
 	 * \brief Constructs a Texture from an Asset resource.
-	 * \param res Unique pointer to an Asset resource containing texture data.
+	 * \param src Asset with texture data to load.
 	 */
-	Texture(std::unique_ptr<Asset> res);
+	Texture(const Asset & src);
 
 	/**
 	 * \brief Destroys the Texture instance, freeing associated resources.
@@ -59,7 +53,7 @@ private:
 	 * \brief Loads the texture from an Asset resource.
 	 * \param res Unique pointer to an Asset resource to load the texture from.
 	 */
-	void load(std::unique_ptr<Asset> res);
+	void load(const Asset & res);
 
 private:
 	//! The texture of the class from the library
diff --git a/src/crepe/api/Transform.cpp b/src/crepe/api/Transform.cpp
index cd944bd..a85b792 100644
--- a/src/crepe/api/Transform.cpp
+++ b/src/crepe/api/Transform.cpp
@@ -4,7 +4,7 @@
 
 using namespace crepe;
 
-Transform::Transform(game_object_id_t id, const Vector2 & point, double rotation, double scale)
+Transform::Transform(game_object_id_t id, const vec2 & point, double rotation, double scale)
 	: Component(id),
 	  position(point),
 	  rotation(rotation),
diff --git a/src/crepe/api/Transform.h b/src/crepe/api/Transform.h
index 18aa293..6243a93 100644
--- a/src/crepe/api/Transform.h
+++ b/src/crepe/api/Transform.h
@@ -1,8 +1,7 @@
 #pragma once
 
-#include "api/Vector2.h"
-
 #include "Component.h"
+#include "types.h"
 
 namespace crepe {
 
@@ -15,7 +14,7 @@ namespace crepe {
 class Transform : public Component {
 public:
 	//! Translation (shift)
-	Vector2 position = {0, 0};
+	vec2 position = {0, 0};
 	//! Rotation, in degrees
 	double rotation = 0;
 	//! Multiplication factor
@@ -28,7 +27,7 @@ protected:
 	 * \param rotation The rotation of the GameObject
 	 * \param scale The scale of the GameObject
 	 */
-	Transform(game_object_id_t id, const Vector2 & point, double rotation, double scale);
+	Transform(game_object_id_t id, const vec2 & point, double rotation, double scale);
 	/**
 	 * There is always exactly one transform component per entity
 	 * \return 1
diff --git a/src/crepe/api/Vector2.cpp b/src/crepe/api/Vector2.cpp
deleted file mode 100644
index 30b968e..0000000
--- a/src/crepe/api/Vector2.cpp
+++ /dev/null
@@ -1,33 +0,0 @@
-#include "Vector2.h"
-
-using namespace crepe;
-
-Vector2 Vector2::operator-(const Vector2 & other) const { return {x - other.x, y - other.y}; }
-
-Vector2 Vector2::operator+(const Vector2 & other) const { return {x + other.x, y + other.y}; }
-
-Vector2 Vector2::operator*(double scalar) const { return {x * scalar, y * scalar}; }
-
-Vector2 & Vector2::operator*=(const Vector2 & other) {
-	x *= other.x;
-	y *= other.y;
-	return *this;
-}
-
-Vector2 & Vector2::operator+=(const Vector2 & other) {
-	x += other.x;
-	y += other.y;
-	return *this;
-}
-
-Vector2 & Vector2::operator+=(double other) {
-	x += other;
-	y += other;
-	return *this;
-}
-
-Vector2 Vector2::operator-() const { return {-x, -y}; }
-
-bool Vector2::operator==(const Vector2 & other) const { return x == other.x && y == other.y; }
-
-bool Vector2::operator!=(const Vector2 & other) const { return !(*this == other); }
diff --git a/src/crepe/api/Vector2.h b/src/crepe/api/Vector2.h
index 2fb6136..c278c87 100644
--- a/src/crepe/api/Vector2.h
+++ b/src/crepe/api/Vector2.h
@@ -3,38 +3,71 @@
 namespace crepe {
 
 //! 2D vector
+template <class T>
 struct Vector2 {
 	//! X component of the vector
-	double x = 0;
+	T x = 0;
 	//! Y component of the vector
-	double y = 0;
+	T y = 0;
 
 	//! Subtracts another vector from this vector and returns the result.
-	Vector2 operator-(const Vector2 & other) const;
+	Vector2 operator-(const Vector2<T> & other) const;
+
+	//! Subtracts a scalar value from both components of this vector and returns the result.
+	Vector2 operator-(T scalar) const;
 
 	//! Adds another vector to this vector and returns the result.
-	Vector2 operator+(const Vector2 & other) const;
+	Vector2 operator+(const Vector2<T> & other) const;
+
+	//! Adds a scalar value to both components of this vector and returns the result.
+	Vector2 operator+(T scalar) const;
+
+	//! Multiplies this vector by another vector element-wise and returns the result.
+	Vector2 operator*(const Vector2<T> & other) const;
 
 	//! Multiplies this vector by a scalar and returns the result.
-	Vector2 operator*(double scalar) const;
+	Vector2 operator*(T scalar) const;
 
-	//! Multiplies this vector by another vector element-wise and updates this vector.
-	Vector2 & operator*=(const Vector2 & other);
+	//! Divides this vector by another vector element-wise and returns the result.
+	Vector2 operator/(const Vector2<T> & other) const;
+
+	//! Divides this vector by a scalar and returns the result.
+	Vector2 operator/(T scalar) const;
 
 	//! Adds another vector to this vector and updates this vector.
-	Vector2 & operator+=(const Vector2 & other);
+	Vector2 & operator+=(const Vector2<T> & other);
 
 	//! Adds a scalar value to both components of this vector and updates this vector.
-	Vector2 & operator+=(double other);
+	Vector2 & operator+=(T other);
+
+	//! Subtracts another vector from this vector and updates this vector.
+	Vector2 & operator-=(const Vector2<T> & other);
+
+	//! Subtracts a scalar value from both components of this vector and updates this vector.
+	Vector2 & operator-=(T other);
+
+	//! Multiplies this vector by another vector element-wise and updates this vector.
+	Vector2 & operator*=(const Vector2<T> & other);
+
+	//! Multiplies this vector by a scalar and updates this vector.
+	Vector2 & operator*=(T other);
+
+	//! Divides this vector by another vector element-wise and updates this vector.
+	Vector2 & operator/=(const Vector2<T> & other);
+
+	//! Divides this vector by a scalar and updates this vector.
+	Vector2 & operator/=(T other);
 
 	//! Returns the negation of this vector.
 	Vector2 operator-() const;
 
 	//! Checks if this vector is equal to another vector.
-	bool operator==(const Vector2 & other) const;
+	bool operator==(const Vector2<T> & other) const;
 
 	//! Checks if this vector is not equal to another vector.
-	bool operator!=(const Vector2 & other) const;
+	bool operator!=(const Vector2<T> & other) const;
 };
 
 } // namespace crepe
+
+#include "Vector2.hpp"
diff --git a/src/crepe/api/Vector2.hpp b/src/crepe/api/Vector2.hpp
new file mode 100644
index 0000000..cad15f8
--- /dev/null
+++ b/src/crepe/api/Vector2.hpp
@@ -0,0 +1,118 @@
+#pragma once
+
+#include "Vector2.h"
+
+namespace crepe {
+
+template <class T>
+Vector2<T> Vector2<T>::operator-(const Vector2<T> & other) const {
+	return {x - other.x, y - other.y};
+}
+
+template <class T>
+Vector2<T> Vector2<T>::operator-(T scalar) const {
+	return {x - scalar, y - scalar};
+}
+
+template <class T>
+Vector2<T> Vector2<T>::operator+(const Vector2<T> & other) const {
+	return {x + other.x, y + other.y};
+}
+
+template <class T>
+Vector2<T> Vector2<T>::operator+(T scalar) const {
+	return {x + scalar, y + scalar};
+}
+
+template <class T>
+Vector2<T> Vector2<T>::operator*(const Vector2<T> & other) const {
+	return {x * other.x, y * other.y};
+}
+
+template <class T>
+Vector2<T> Vector2<T>::operator*(T scalar) const {
+	return {x * scalar, y * scalar};
+}
+
+template <class T>
+Vector2<T> Vector2<T>::operator/(const Vector2<T> & other) const {
+	return {x / other.x, y / other.y};
+}
+
+template <class T>
+Vector2<T> Vector2<T>::operator/(T scalar) const {
+	return {x / scalar, y / scalar};
+}
+
+template <class T>
+Vector2<T> & Vector2<T>::operator+=(const Vector2<T> & other) {
+	x += other.x;
+	y += other.y;
+	return *this;
+}
+
+template <class T>
+Vector2<T> & Vector2<T>::operator+=(T other) {
+	x += other;
+	y += other;
+	return *this;
+}
+
+template <class T>
+Vector2<T> & Vector2<T>::operator-=(const Vector2<T> & other) {
+	x -= other.x;
+	y -= other.y;
+	return *this;
+}
+
+template <class T>
+Vector2<T> & Vector2<T>::operator-=(T other) {
+	x -= other;
+	y -= other;
+	return *this;
+}
+
+template <class T>
+Vector2<T> & Vector2<T>::operator*=(const Vector2<T> & other) {
+	x *= other.x;
+	y *= other.y;
+	return *this;
+}
+
+template <class T>
+Vector2<T> & Vector2<T>::operator*=(T other) {
+	x *= other;
+	y *= other;
+	return *this;
+}
+
+template <class T>
+Vector2<T> & Vector2<T>::operator/=(const Vector2<T> & other) {
+	x /= other.x;
+	y /= other.y;
+	return *this;
+}
+
+template <class T>
+Vector2<T> & Vector2<T>::operator/=(T other) {
+	x /= other;
+	y /= other;
+	return *this;
+}
+
+template <class T>
+Vector2<T> Vector2<T>::operator-() const {
+	return {-x, -y};
+}
+
+template <class T>
+bool Vector2<T>::operator==(const Vector2<T> & other) const {
+	return x == other.x && y == other.y;
+}
+
+template <class T>
+bool Vector2<T>::operator!=(const Vector2<T> & other) const {
+	return !(*this == other);
+}
+
+} // namespace crepe