Add initial ECS support

include/Nazara/Core/ECS.hpp

@@ -0,0 +1,46 @@
+// Copyright (C) 2020 Jérôme Leclercq
+// 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_ECS_HPP
+#define NAZARA_ECS_HPP
+
+#include <Nazara/Prerequisites.hpp>
+#include <Nazara/Core/Core.hpp>
+#include <entt/entt.hpp>
+
+namespace Nz
+{
+	class GraphicsComponent;
+	class NodeComponent;
+	class RigidBody3DComponent;
+
+	class ECS : public ModuleBase<ECS>
+	{
+		friend ModuleBase;
+		friend class Audio;
+		friend class Graphics;
+		friend class Physics2D;
+		friend class Physics3D;
+		friend class Utility;
+
+		public:
+			using Dependencies = TypeList<Core>;
+
+			struct Config {};
+
+			inline ECS(Config /*config*/);
+			~ECS() = default;
+
+		private:
+			static inline void RegisterComponents();
+
+			NAZARA_CORE_API static ECS* s_instance;
+	};
+}
+
+#include <Nazara/Core/ECS.inl>
+
+#endif

include/Nazara/Core/ECS.inl

@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Jérôme Leclercq
+// This file is part of the "Nazara Engine - Core module"
+// For conditions of distribution and use, see copyright notice in Config.hpp
+
+#include <Nazara/Core/ECS.hpp>
+#include <stdexcept>
+#include <Nazara/Core/Debug.hpp>
+
+namespace Nz
+{
+	/*!
+	* \ingroup core
+	* \class Nz::ECS
+	* \brief Core class that represents the ECS module
+	*/
+	inline ECS::ECS(Config /*config*/) :
+	ModuleBase("ECS", this)
+	{
+		RegisterComponents();
+	}
+
+	inline void ECS::RegisterComponents()
+	{
+		if (entt::type_seq<NodeComponent>() != 0)
+			throw std::runtime_error("NodeComponent has wrong index, please initialize Nazara ECS before instancing your own components");
+
+		if (entt::type_seq<GraphicsComponent>() != 1)
+			throw std::runtime_error("GraphicsComponent has wrong index, please initialize Nazara ECS before instancing your own components");
+
+		if (entt::type_seq<RigidBody3DComponent>() != 2)
+			throw std::runtime_error("GraphicsComponent has wrong index, please initialize Nazara ECS before instancing your own components");
+	}
+}
+
+#include <Nazara/Core/DebugOff.hpp>