22 files changed, 71 insertions, 22 deletions
diff --git a/src/crepe/system/AnimatorSystem.cpp b/src/crepe/system/AnimatorSystem.cpp
index 549c35d..8d6d8fa 100644
--- a/src/crepe/system/AnimatorSystem.cpp
+++ b/src/crepe/system/AnimatorSystem.cpp
@@ -1,5 +1,3 @@
-
-
 #include "../api/Animator.h"
 #include "../manager/ComponentManager.h"
 #include "api/LoopTimer.h"
@@ -8,7 +6,7 @@
 
 using namespace crepe;
 
-void AnimatorSystem::update() {
+void AnimatorSystem::frame_update() {
 	ComponentManager & mgr = this->mediator.component_manager;
 	LoopTimer & timer = this->mediator.timer;
 	RefVector<Animator> animations = mgr.get_components_by_type<Animator>();
diff --git a/src/crepe/system/AnimatorSystem.h b/src/crepe/system/AnimatorSystem.h
index 7d3f565..092e131 100644
--- a/src/crepe/system/AnimatorSystem.h
+++ b/src/crepe/system/AnimatorSystem.h
@@ -22,7 +22,7 @@ public:
 	 * Animator components, moving the animations forward and managing their behavior (e.g.,
 	 * looping).
 	 */
-	void update() override;
+	void frame_update() override;
 };
 
 } // namespace crepe
diff --git a/src/crepe/system/AudioSystem.cpp b/src/crepe/system/AudioSystem.cpp
index ddba268..9b86069 100644
--- a/src/crepe/system/AudioSystem.cpp
+++ b/src/crepe/system/AudioSystem.cpp
@@ -7,7 +7,7 @@
 using namespace crepe;
 using namespace std;
 
-void AudioSystem::update() {
+void AudioSystem::fixed_update() {
 	ComponentManager & component_manager = this->mediator.component_manager;
 	ResourceManager & resource_manager = this->mediator.resource_manager;
 	RefVector<AudioSource> components
diff --git a/src/crepe/system/AudioSystem.h b/src/crepe/system/AudioSystem.h
index 2ddc443..56fc98c 100644
--- a/src/crepe/system/AudioSystem.h
+++ b/src/crepe/system/AudioSystem.h
@@ -11,7 +11,7 @@ namespace crepe {
 class AudioSystem : public System {
 public:
 	using System::System;
-	void update() override;
+	void fixed_update() override;
 
 private:
 	/**
diff --git a/src/crepe/system/CMakeLists.txt b/src/crepe/system/CMakeLists.txt
index 6b2e099..1336114 100644
--- a/src/crepe/system/CMakeLists.txt
+++ b/src/crepe/system/CMakeLists.txt
@@ -8,6 +8,8 @@ target_sources(crepe PUBLIC
 	AudioSystem.cpp
 	AnimatorSystem.cpp
 	InputSystem.cpp
+	EventSystem.cpp
+	ReplaySystem.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -19,4 +21,5 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	AudioSystem.h
 	AnimatorSystem.h
 	InputSystem.h
+	EventSystem.h
 )
diff --git a/src/crepe/system/CollisionSystem.cpp b/src/crepe/system/CollisionSystem.cpp
index 44a0431..2db592f 100644
--- a/src/crepe/system/CollisionSystem.cpp
+++ b/src/crepe/system/CollisionSystem.cpp
@@ -23,7 +23,7 @@
 
 using namespace crepe;
 
-void CollisionSystem::update() {
+void CollisionSystem::fixed_update() {
 	std::vector<CollisionInternal> all_colliders;
 	game_object_id_t id = 0;
 	ComponentManager & mgr = this->mediator.component_manager;
diff --git a/src/crepe/system/CollisionSystem.h b/src/crepe/system/CollisionSystem.h
index 5b136c6..48a8f86 100644
--- a/src/crepe/system/CollisionSystem.h
+++ b/src/crepe/system/CollisionSystem.h
@@ -85,7 +85,7 @@ public:
 
 public:
 	//! Updates the collision system by checking for collisions between colliders and handling them.
-	void update() override;
+	void fixed_update() override;
 
 private:
 	/**
diff --git a/src/crepe/system/EventSystem.cpp b/src/crepe/system/EventSystem.cpp
new file mode 100644
index 0000000..bf2b6bc
--- /dev/null
+++ b/src/crepe/system/EventSystem.cpp
@@ -0,0 +1,9 @@
+#include "EventSystem.h"
+
+using namespace crepe;
+
+void EventSystem::fixed_update() {
+	EventManager & ev = this->mediator.event_manager;
+	ev.dispatch_events();
+}
+
diff --git a/src/crepe/system/EventSystem.h b/src/crepe/system/EventSystem.h
new file mode 100644
index 0000000..a179d00
--- /dev/null
+++ b/src/crepe/system/EventSystem.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "System.h"
+
+namespace crepe {
+
+class EventSystem : public System {
+public:
+	using System::System;
+
+	void fixed_update() override;
+};
+
+}
+
diff --git a/src/crepe/system/InputSystem.cpp b/src/crepe/system/InputSystem.cpp
index aaa8bdf..b31bd34 100644
--- a/src/crepe/system/InputSystem.cpp
+++ b/src/crepe/system/InputSystem.cpp
@@ -6,7 +6,7 @@
 
 using namespace crepe;
 
-void InputSystem::update() {
+void InputSystem::fixed_update() {
 	ComponentManager & mgr = this->mediator.component_manager;
 	EventManager & event_mgr = this->mediator.event_manager;
 	std::vector<SDLContext::EventData> event_list = SDLContext::get_instance().get_events();
diff --git a/src/crepe/system/InputSystem.h b/src/crepe/system/InputSystem.h
index 87e86f8..62b0fcd 100644
--- a/src/crepe/system/InputSystem.h
+++ b/src/crepe/system/InputSystem.h
@@ -27,7 +27,7 @@ public:
 	 * \brief Updates the system, processing all input events.
 	 * This method processes all events and triggers corresponding actions.
 	 */
-	void update() override;
+	void fixed_update() override;
 
 private:
 	//! Stores the last position of the mouse when the button was pressed.
diff --git a/src/crepe/system/ParticleSystem.cpp b/src/crepe/system/ParticleSystem.cpp
index b14c52f..5ccd128 100644
--- a/src/crepe/system/ParticleSystem.cpp
+++ b/src/crepe/system/ParticleSystem.cpp
@@ -10,7 +10,7 @@
 
 using namespace crepe;
 
-void ParticleSystem::update() {
+void ParticleSystem::frame_update() {
 	// Get all emitters
 	ComponentManager & mgr = this->mediator.component_manager;
 	RefVector<ParticleEmitter> emitters = mgr.get_components_by_type<ParticleEmitter>();
diff --git a/src/crepe/system/ParticleSystem.h b/src/crepe/system/ParticleSystem.h
index 068f01c..6c631ea 100644
--- a/src/crepe/system/ParticleSystem.h
+++ b/src/crepe/system/ParticleSystem.h
@@ -20,7 +20,7 @@ public:
 	 * \brief Updates all particle emitters by emitting particles, updating particle states, and
 	 * checking bounds.
 	 */
-	void update() override;
+	void frame_update() override;
 
 private:
 	/**
diff --git a/src/crepe/system/PhysicsSystem.cpp b/src/crepe/system/PhysicsSystem.cpp
index ebf4439..714e531 100644
--- a/src/crepe/system/PhysicsSystem.cpp
+++ b/src/crepe/system/PhysicsSystem.cpp
@@ -10,7 +10,7 @@
 
 using namespace crepe;
 
-void PhysicsSystem::update() {
+void PhysicsSystem::fixed_update() {
 	ComponentManager & mgr = this->mediator.component_manager;
 	RefVector<Rigidbody> rigidbodies = mgr.get_components_by_type<Rigidbody>();
 	RefVector<Transform> transforms = mgr.get_components_by_type<Transform>();
diff --git a/src/crepe/system/PhysicsSystem.h b/src/crepe/system/PhysicsSystem.h
index 26152a5..5ed624f 100644
--- a/src/crepe/system/PhysicsSystem.h
+++ b/src/crepe/system/PhysicsSystem.h
@@ -18,7 +18,7 @@ public:
 	 *
 	 * It calculates new velocties and changes the postion in the transform.
 	 */
-	void update() override;
+	void fixed_update() override;
 };
 
 } // namespace crepe
diff --git a/src/crepe/system/RenderSystem.cpp b/src/crepe/system/RenderSystem.cpp
index 26f2c85..e147b9f 100644
--- a/src/crepe/system/RenderSystem.cpp
+++ b/src/crepe/system/RenderSystem.cpp
@@ -61,7 +61,7 @@ RefVector<Sprite> RenderSystem::sort(RefVector<Sprite> & objs) const {
 	return sorted_objs;
 }
 
-void RenderSystem::update() {
+void RenderSystem::frame_update() {
 	this->clear_screen();
 	this->render();
 	this->present_screen();
diff --git a/src/crepe/system/RenderSystem.h b/src/crepe/system/RenderSystem.h
index e270a6b..a01923d 100644
--- a/src/crepe/system/RenderSystem.h
+++ b/src/crepe/system/RenderSystem.h
@@ -27,7 +27,7 @@ public:
 	 * \brief Updates the RenderSystem for the current frame.
 	 * This method is called to perform all rendering operations for the current game frame.
 	 */
-	void update() override;
+	void frame_update() override;
 
 private:
 	//! Clears the screen in preparation for rendering.
diff --git a/src/crepe/system/ReplaySystem.cpp b/src/crepe/system/ReplaySystem.cpp
new file mode 100644
index 0000000..3aabb58
--- /dev/null
+++ b/src/crepe/system/ReplaySystem.cpp
@@ -0,0 +1,7 @@
+#include "ReplaySystem.h"
+
+using namespace crepe;
+
+void ReplaySystem::fixed_update() {
+}
+
diff --git a/src/crepe/system/ReplaySystem.h b/src/crepe/system/ReplaySystem.h
new file mode 100644
index 0000000..15ef3fc
--- /dev/null
+++ b/src/crepe/system/ReplaySystem.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include "System.h"
+
+namespace crepe {
+
+class ReplaySystem : public System {
+public:
+	using System::System;
+
+	void fixed_update() override;
+};
+
+}
+
diff --git a/src/crepe/system/ScriptSystem.cpp b/src/crepe/system/ScriptSystem.cpp
index d6b2ca1..ab79fc3 100644
--- a/src/crepe/system/ScriptSystem.cpp
+++ b/src/crepe/system/ScriptSystem.cpp
@@ -7,7 +7,7 @@
 using namespace std;
 using namespace crepe;
 
-void ScriptSystem::update() {
+void ScriptSystem::fixed_update() {
 	dbg_trace();
 
 	ComponentManager & mgr = this->mediator.component_manager;
diff --git a/src/crepe/system/ScriptSystem.h b/src/crepe/system/ScriptSystem.h
index 3db1b1e..612c2ae 100644
--- a/src/crepe/system/ScriptSystem.h
+++ b/src/crepe/system/ScriptSystem.h
@@ -22,7 +22,7 @@ public:
 	 * method. It also calls Script::init() if this has not been done before on
 	 * the \c BehaviorScript instance.
 	 */
-	void update() override;
+	void fixed_update() override;
 };
 
 } // namespace crepe
diff --git a/src/crepe/system/System.h b/src/crepe/system/System.h
index 063dfbf..e2ce7eb 100644
--- a/src/crepe/system/System.h
+++ b/src/crepe/system/System.h
@@ -14,10 +14,12 @@ class ComponentManager;
  */
 class System {
 public:
-	/**
-	 * \brief Process all components this system is responsible for.
-	 */
-	virtual void update() = 0;
+	//! Code that runs in the fixed loop
+	virtual void fixed_update() {};
+	//! Code that runs in the frame loop
+	virtual void frame_update() {};
+	//! Indicates that the update functions of this system should be run
+	bool active = true;
 
 public:
 	System(const Mediator & m);