Add system graph (wip)

include/Nazara/Core/Systems/SystemGraph.hpp

@@ -0,0 +1,70 @@
+// Copyright (C) 2022 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#pragma once
+
+#ifndef NAZARA_CORE_SYSTEMS_SYSTEMGRAPH_HPP
+#define NAZARA_CORE_SYSTEMS_SYSTEMGRAPH_HPP
+
+#include <Nazara/Prerequisites.hpp>
+#include <Nazara/Core/Clock.hpp>
+#include <Nazara/Core/Config.hpp>
+#include <Nazara/Utils/MovablePtr.hpp>
+#include <entt/entt.hpp>
+#include <functional>
+#include <unordered_map>
+#include <vector>
+
+namespace Nz
+{
+	class NAZARA_CORE_API SystemGraph
+	{
+		public:
+			inline SystemGraph(entt::registry& registry);
+			SystemGraph(const SystemGraph&) = delete;
+			SystemGraph(SystemGraph&&) = delete;
+			~SystemGraph() = default;
+
+			template<typename T, typename... Args> T& AddSystem(Args&&... args);
+
+			template<typename T> T& GetSystem() const;
+
+			void Update();
+			void Update(float elapsedTime);
+
+			SystemGraph& operator=(const SystemGraph&) = delete;
+			SystemGraph& operator=(SystemGraph&&) = delete;
+
+		private:
+			struct NAZARA_CORE_API NodeBase
+			{
+				virtual ~NodeBase();
+
+				virtual void Update(float elapsedTime) = 0;
+
+				Int64 executionOrder;
+			};
+
+			template<typename T>
+			struct Node : NodeBase
+			{
+				template<typename... Args> Node(Args&&... args);
+
+				void Update(float elapsedTime) override;
+
+				T system;
+			};
+
+			std::unordered_map<entt::id_type, std::size_t /*nodeIndex*/> m_systemToNodes;
+			std::vector<NodeBase*> m_orderedNodes;
+			std::vector<std::unique_ptr<NodeBase>> m_nodes;
+			entt::registry& m_registry;
+			Nz::Clock m_clock;
+			bool m_systemOrderUpdated;
+	};
+}
+
+#include <Nazara/Core/Systems/SystemGraph.inl>
+
+#endif // NAZARA_CORE_SYSTEMS_SYSTEMGRAPH_HPP