Add initial ECS support

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>