Merge remote-tracking branch 'origin/master' into max/ecs

19 files changed, 365 insertions, 91 deletions

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 d6b6801..c3e0b37 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -14,7 +14,6 @@ target_sources(crepe PUBLIC
 	Metadata.cpp
 	Scene.cpp
 	SceneManager.cpp
-	Vector2.cpp
 	Camera.cpp
 	Animator.cpp
 	EventManager.cpp
@@ -24,6 +23,7 @@ target_sources(crepe PUBLIC
 	LoopTimer.cpp
 	Asset.cpp
 	EventHandler.cpp
+	Script.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -37,6 +37,7 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	Rigidbody.h
 	Sprite.h
 	Vector2.h
+	Vector2.hpp
 	Color.h
 	Texture.h 
 	AssetManager.h 
diff --git a/src/crepe/api/Event.h b/src/crepe/api/Event.h
index 06cf7f3..b267e3e 100644
--- a/src/crepe/api/Event.h
+++ b/src/crepe/api/Event.h
@@ -1,10 +1,12 @@
-// TODO discussing the location of these events
 #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.
  */
@@ -91,11 +93,7 @@ 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.
@@ -110,3 +108,5 @@ public:
  * \brief Event triggered to indicate the application is shutting down.
  */
 class ShutDownEvent : public Event {};
+
+} // namespace crepe
diff --git a/src/crepe/api/EventHandler.hpp b/src/crepe/api/EventHandler.hpp
index 391dcca..050e57e 100644
--- a/src/crepe/api/EventHandler.hpp
+++ b/src/crepe/api/EventHandler.hpp
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <typeindex>
 
 #include "EventHandler.h"
diff --git a/src/crepe/api/EventManager.h b/src/crepe/api/EventManager.h
index 348a04d..1a33023 100644
--- a/src/crepe/api/EventManager.h
+++ b/src/crepe/api/EventManager.h
@@ -77,7 +77,7 @@ public:
 	 * \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, event_channel_t channel = CHANNEL_ALL);
+	void trigger_event(const EventType & event = {}, event_channel_t channel = CHANNEL_ALL);
 
 	/**
 	 * \brief Queue an event for later processing.
@@ -89,7 +89,7 @@ public:
 	 * \param channel The channel to associate with the event (default is CHANNEL_ALL).
 	 */
 	template <typename EventType>
-	void queue_event(const EventType & event, event_channel_t channel = CHANNEL_ALL);
+	void queue_event(const EventType & event = {}, event_channel_t channel = CHANNEL_ALL);
 
 	/**
 	 * \brief Process all queued events.
diff --git a/src/crepe/api/GameObject.cpp b/src/crepe/api/GameObject.cpp
index 7c873ec..6c1de12 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) {
 
diff --git a/src/crepe/api/GameObject.h b/src/crepe/api/GameObject.h
index 07d5ad2..a30dce3 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/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/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 839d937..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;
@@ -55,7 +75,7 @@ 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
 	 *
@@ -64,25 +84,108 @@ protected:
 	template <typename T>
 	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 a85d814..a2463bf 100644
--- a/src/crepe/api/Script.hpp
+++ b/src/crepe/api/Script.hpp
@@ -20,8 +20,38 @@ T & Script::get_component() const {
 
 template <typename T>
 RefVector<T> Script::get_components() const {
-	auto & mgr = *this->component_manager_ref;
+	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/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