Added systems

It's now officially an ECS, yay!


Former-commit-id: e2aacaa5c9fd362921cf3d064e346d11f942bd59

SDK/include/NDK/BaseSystem.hpp

@@ -0,0 +1,68 @@
+// Copyright (C) 2015 Jérôme Leclercq
+// This file is part of the "Nazara Development Kit"
+// For conditions of distribution and use, see copyright notice in Prerequesites.hpp
+
+#pragma once
+
+#ifndef NDK_BASESYSTEM_HPP
+#define NDK_BASESYSTEM_HPP
+
+#include <Nazara/Core/Bitset.hpp>
+#include <NDK/EntityHandle.hpp>
+#include <vector>
+#include <unordered_set>
+
+namespace Ndk
+{
+	class World;
+
+	class NDK_API BaseSystem
+	{
+		friend class Entity;
+		friend World;
+
+		public:
+			BaseSystem(SystemId systemId);
+			virtual ~BaseSystem();
+
+			virtual BaseSystem* Clone() const = 0;
+
+			bool Filters(const EntityHandle& entity) const;
+
+			const std::vector<EntityHandle>& GetEntities() const;
+			SystemId GetId() const;
+			World& GetWorld() const;
+
+			bool HasEntity(const EntityHandle& entity) const;
+
+		protected:
+			template<typename ComponentType> void Excludes();
+			template<typename ComponentType1, typename ComponentType2, typename... Rest> void Excludes();
+			void ExcludesComponent(ComponentId componentId);
+
+			template<typename ComponentType> void Requires();
+			template<typename ComponentType1, typename ComponentType2, typename... Rest> void Requires();
+			void RequiresComponent(ComponentId componentId);
+
+		private:
+			void AddEntity(const EntityHandle& entity);
+
+			virtual void OnEntityAdded(const EntityHandle& entity);
+			virtual void OnEntityRemoved(const EntityHandle& entity);
+
+			void RemoveEntity(const EntityHandle& entity);
+
+			void SetWorld(World& world);
+
+			std::vector<EntityHandle> m_entities;
+			NzBitset<nzUInt64> m_entityBits;
+			std::unordered_set<ComponentId> m_excludedComponents;
+			std::unordered_set<ComponentId> m_requiredComponents;
+			SystemId m_systemId;
+			World* m_world;
+	};
+}
+
+#include <NDK/BaseSystem.inl>
+
+#endif // NDK_BASESYSTEM_HPP