split up loopmanager into SystemManager and Engine

5 files changed, 145 insertions, 2 deletions

diff --git a/src/crepe/manager/CMakeLists.txt b/src/crepe/manager/CMakeLists.txt
index 459bbfa..aa19f3e 100644
--- a/src/crepe/manager/CMakeLists.txt
+++ b/src/crepe/manager/CMakeLists.txt
@@ -6,6 +6,7 @@ target_sources(crepe PUBLIC
 	SceneManager.cpp
 	ResourceManager.cpp
 	ReplayManager.cpp
+	SystemManager.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -21,5 +22,7 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	ResourceManager.h
 	ResourceManager.hpp
 	ReplayManager.h
+	SystemManager.h
+	SystemManager.hpp
 )
 
diff --git a/src/crepe/manager/Mediator.h b/src/crepe/manager/Mediator.h
index f5864e7..95ca4b5 100644
--- a/src/crepe/manager/Mediator.h
+++ b/src/crepe/manager/Mediator.h
@@ -14,7 +14,7 @@ class ResourceManager;
 class SDLContext;
 class LoopTimer;
 class ReplayManager;
-class LoopManager;
+class SystemManager;
 
 /**
  * Struct to pass references to classes that would otherwise need to be singletons down to
@@ -37,7 +37,7 @@ struct Mediator {
 	OptionalRef<ResourceManager> resource_manager;
 	OptionalRef<LoopTimer> timer;
 	OptionalRef<ReplayManager> replay_manager;
-	OptionalRef<LoopManager> loop_manager;
+	OptionalRef<SystemManager> system_manager;
 };
 
 } // namespace crepe
diff --git a/src/crepe/manager/SystemManager.cpp b/src/crepe/manager/SystemManager.cpp
new file mode 100644
index 0000000..8fd80a7
--- /dev/null
+++ b/src/crepe/manager/SystemManager.cpp
@@ -0,0 +1,45 @@
+#include "../system/AISystem.h"
+#include "../system/AnimatorSystem.h"
+#include "../system/AudioSystem.h"
+#include "../system/CollisionSystem.h"
+#include "../system/InputSystem.h"
+#include "../system/ParticleSystem.h"
+#include "../system/PhysicsSystem.h"
+#include "../system/RenderSystem.h"
+#include "../system/ScriptSystem.h"
+#include "../system/EventSystem.h"
+
+#include "SystemManager.h"
+
+using namespace crepe;
+using namespace std;
+
+SystemManager::SystemManager(Mediator & mediator) : Manager(mediator) {
+	this->load_system<ScriptSystem>();
+	this->load_system<AISystem>();
+	this->load_system<PhysicsSystem>();
+	this->load_system<CollisionSystem>();
+	this->load_system<AnimatorSystem>();
+	this->load_system<ParticleSystem>();
+	this->load_system<RenderSystem>();
+	this->load_system<InputSystem>();
+	this->load_system<EventSystem>();
+	this->load_system<AudioSystem>();
+
+	this->mediator.system_manager = *this;
+}
+
+void SystemManager::fixed_update() {
+	for (auto & [type, system] : this->systems) {
+		if (!system->active) continue;
+		system->fixed_update();
+	}
+}
+
+void SystemManager::frame_update() {
+	for (auto & [type, system] : this->systems) {
+		if (!system->active) continue;
+		system->frame_update();
+	}
+}
+
diff --git a/src/crepe/manager/SystemManager.h b/src/crepe/manager/SystemManager.h
new file mode 100644
index 0000000..5726a5c
--- /dev/null
+++ b/src/crepe/manager/SystemManager.h
@@ -0,0 +1,55 @@
+#pragma once
+
+#include "../system/System.h"
+
+#include "Manager.h"
+
+namespace crepe {
+
+class SystemManager : public Manager {
+public:
+	SystemManager(Mediator &);
+
+	/**
+	 * \brief Per-frame update.
+	 *
+	 * Updates the game state based on the elapsed time since the last frame.
+	 */
+	void frame_update();
+
+	/**
+	 * \brief Fixed update executed at a fixed rate.
+	 *
+	 * This function updates physics and game logic based on LoopTimer's fixed_delta_time.
+	 */
+	void fixed_update();
+
+private:
+	/**
+	 * \brief Collection of System instances
+	 *
+	 * This map holds System instances indexed by the system's class typeid. It is filled in the
+	 * constructor of \c SystemManager using SystemManager::load_system.
+	 */
+	std::unordered_map<std::type_index, std::unique_ptr<System>> systems;
+	/**
+	 * \brief Initialize a system
+	 * \tparam T System type (must be derivative of \c System)
+	 */
+	template <class T>
+	void load_system();
+
+public:
+	/**
+	 * \brief Retrieve a reference to ECS system
+	 * \tparam T System type
+	 * \returns Reference to system instance
+	 * \throws std::runtime_error if the System is not initialized
+	 */
+	template <class T>
+	T & get_system();
+};
+
+} // namespace crepe
+
+#include "SystemManager.hpp"
diff --git a/src/crepe/manager/SystemManager.hpp b/src/crepe/manager/SystemManager.hpp
new file mode 100644
index 0000000..46ada5f
--- /dev/null
+++ b/src/crepe/manager/SystemManager.hpp
@@ -0,0 +1,40 @@
+#pragma once
+
+#include <memory>
+#include <cassert>
+#include <format>
+
+#include "SystemManager.h"
+
+namespace crepe {
+
+template <class T>
+T & SystemManager::get_system() {
+	using namespace std;
+	static_assert(is_base_of<System, T>::value, "get_system must recieve a derivative class of System");
+
+	const type_info & type = typeid(T);
+	if (!this->systems.contains(type))
+		throw runtime_error(format("SystemManager: {} is not initialized", type.name()));
+
+	System * system = this->systems.at(type).get();
+	T * concrete_system = dynamic_cast<T *>(system);
+	assert(concrete_system != nullptr);
+
+	return *concrete_system;
+}
+
+template <class T>
+void SystemManager::load_system() {
+	using namespace std;
+	static_assert(is_base_of<System, T>::value,
+			"load_system must recieve a derivative class of System");
+
+	const type_info & type = typeid(T);
+	if (this->systems.contains(type))
+		throw runtime_error(format("SystemManager: {} is already initialized", type.name()));
+	System * system = new T(this->mediator);
+	this->systems[type] = unique_ptr<System>(system);
+}
+
+} // namespace crepe