382 lines
7.7 KiB
C++
382 lines
7.7 KiB
C++
// Copyright (C) 2017 Jérôme Leclercq
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// This file is part of the "Nazara Development Kit"
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// For conditions of distribution and use, see copyright notice in Prerequisites.hpp
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#include <Nazara/Core/Error.hpp>
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#include <type_traits>
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namespace Ndk
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{
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/*!
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* \brief Constructs a BaseSystem object with an index
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*
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* \param systemId Index of the system
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*/
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inline BaseSystem::BaseSystem(SystemIndex systemId) :
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m_systemIndex(systemId),
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m_world(nullptr),
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m_updateEnabled(true),
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m_updateOrder(0)
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{
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SetFixedUpdateRate(0);
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SetMaximumUpdateRate(30);
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}
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/*!
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* \brief Enables the system
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*
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* \param enable Should the system be enabled
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*/
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inline void BaseSystem::Enable(bool enable)
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{
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m_updateEnabled = enable;
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}
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/*!
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* \brief Gets every entities that system handle
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* \return A constant reference to the list of entities
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*/
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inline const EntityList& BaseSystem::GetEntities() const
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{
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return m_entities;
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}
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/*!
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* \brief Gets the maximum rate of update of the system
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* \return Update rate
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*/
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inline float BaseSystem::GetFixedUpdateRate() const
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{
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return (m_fixedUpdateRate > 0.f) ? 1.f / m_fixedUpdateRate : 0.f;
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}
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/*!
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* \brief Gets the maximum rate of update of the system
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* \return Update rate
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*/
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inline float BaseSystem::GetMaximumUpdateRate() const
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{
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return (m_maxUpdateRate > 0.f) ? 1.f / m_maxUpdateRate : 0.f;
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}
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/*!
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* \brief Gets the index of the system
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* \return Index of the system
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*/
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inline SystemIndex BaseSystem::GetIndex() const
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{
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return m_systemIndex;
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}
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/*!
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* \brief Gets the update order of the system
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* \return Update order
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*
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* \see SetUpdateOrder
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*/
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inline int BaseSystem::GetUpdateOrder() const
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{
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return m_updateOrder;
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}
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/*!
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* \brief Gets the world on which the system operate
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* \return World in which the system is
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*/
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inline World& BaseSystem::GetWorld() const
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{
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return *m_world;
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}
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/*!
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* \brief Checks whether or not the system is enabled
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* \return true If it is the case
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*/
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inline bool BaseSystem::IsEnabled() const
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{
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return m_updateEnabled;
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}
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/*!
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* \brief Checks whether or not the system has the entity
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* \return true If it is the case
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*
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* \param entity Pointer to the entity
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*/
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inline bool BaseSystem::HasEntity(const Entity* entity) const
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{
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return m_entities.Has(entity);
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}
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/*!
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* \brief Sets the fixed update rate for the system
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*
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* \param updatePerSecond Update rate, 0 means update rate is not fixed
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*/
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inline void BaseSystem::SetFixedUpdateRate(float updatePerSecond)
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{
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m_updateCounter = 0.f;
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m_fixedUpdateRate = (updatePerSecond > 0.f) ? 1.f / updatePerSecond : 0.f; // 0.f means no limit
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}
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/*!
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* \brief Sets the maximum update rate for the system
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*
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* \param updatePerSecond Update rate, 0 means as much as possible
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*/
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inline void BaseSystem::SetMaximumUpdateRate(float updatePerSecond)
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{
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m_updateCounter = 0.f;
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m_maxUpdateRate = (updatePerSecond > 0.f) ? 1.f / updatePerSecond : 0.f; // 0.f means no limit
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}
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/*!
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* \brief Updates the system
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*
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* \param elapsedTime Delta time used for the update
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*/
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inline void BaseSystem::Update(float elapsedTime)
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{
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if (!IsEnabled())
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return;
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m_updateCounter += elapsedTime;
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if (m_maxUpdateRate > 0.f)
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{
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if (m_updateCounter >= m_maxUpdateRate)
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{
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if (m_fixedUpdateRate > 0.f)
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{
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while (m_updateCounter >= m_fixedUpdateRate)
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{
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OnUpdate(m_fixedUpdateRate);
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m_updateCounter -= m_fixedUpdateRate;
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}
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}
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else
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{
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OnUpdate(m_maxUpdateRate);
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m_updateCounter -= m_maxUpdateRate;
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}
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}
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}
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else
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{
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if (m_fixedUpdateRate > 0.f)
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{
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while (m_updateCounter >= m_fixedUpdateRate)
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{
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OnUpdate(m_fixedUpdateRate);
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m_updateCounter -= m_fixedUpdateRate;
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}
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}
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else
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OnUpdate(elapsedTime);
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}
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}
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/*!
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* \brief Excludes some component from the system
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*/
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template<typename ComponentType>
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void BaseSystem::Excludes()
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{
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static_assert(std::is_base_of<BaseComponent, ComponentType>::value , "ComponentType is not a component");
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ExcludesComponent(GetComponentIndex<ComponentType>());
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}
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/*!
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* \brief Excludes some components from the system
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*/
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template<typename ComponentType1, typename ComponentType2, typename... Rest>
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void BaseSystem::Excludes()
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{
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Excludes<ComponentType1>();
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Excludes<ComponentType2, Rest...>();
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}
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/*!
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* \brief Excludes some component from the system by index
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*
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* \param index Index of the component
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*/
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inline void BaseSystem::ExcludesComponent(ComponentIndex index)
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{
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m_excludedComponents.UnboundedSet(index);
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}
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/*!
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* \brief Gets the next index for the system
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* \return Next unique index for the system
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*/
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inline SystemIndex BaseSystem::GetNextIndex()
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{
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return s_nextIndex++;
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}
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/*!
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* \brief Requires some component from the system
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*/
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template<typename ComponentType>
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void BaseSystem::Requires()
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{
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static_assert(std::is_base_of<BaseComponent, ComponentType>::value, "ComponentType is not a component");
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RequiresComponent(GetComponentIndex<ComponentType>());
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}
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/*!
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* \brief Requires some components from the system
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*/
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template<typename ComponentType1, typename ComponentType2, typename... Rest>
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void BaseSystem::Requires()
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{
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Requires<ComponentType1>();
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Requires<ComponentType2, Rest...>();
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}
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/*!
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* \brief Requires some component for the system by index
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*
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* \param index Index of the component
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*/
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inline void BaseSystem::RequiresComponent(ComponentIndex index)
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{
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m_requiredComponents.UnboundedSet(index);
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}
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/*!
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* \brief Requires any component from the system
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*/
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template<typename ComponentType>
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void BaseSystem::RequiresAny()
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{
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static_assert(std::is_base_of<BaseComponent, ComponentType>::value, "ComponentType is not a component");
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RequiresAnyComponent(GetComponentIndex<ComponentType>());
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}
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/*!
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* \brief Requires any components from the system
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*/
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template<typename ComponentType1, typename ComponentType2, typename... Rest>
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void BaseSystem::RequiresAny()
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{
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RequiresAny<ComponentType1>();
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RequiresAny<ComponentType2, Rest...>();
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}
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/*!
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* \brief Requires any component for the system by index
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*
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* \param index Index of the component
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*/
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inline void BaseSystem::RequiresAnyComponent(ComponentIndex index)
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{
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m_requiredAnyComponents.UnboundedSet(index);
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}
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/*!
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* \brief Adds an entity to a system
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*
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* \param entity Pointer to the entity
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*
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* \remark Produces a NazaraAssert if entity is invalid
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*/
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inline void BaseSystem::AddEntity(Entity* entity)
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{
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NazaraAssert(entity, "Invalid entity");
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m_entities.Insert(entity);
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entity->RegisterSystem(m_systemIndex);
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OnEntityAdded(entity);
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}
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/*!
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* \brief Removes an entity to a system
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*
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* \param entity Pointer to the entity
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*
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* \remark Produces a NazaraAssert if entity is invalid
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*/
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inline void BaseSystem::RemoveEntity(Entity* entity)
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{
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NazaraAssert(entity, "Invalid entity");
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m_entities.Remove(entity);
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entity->UnregisterSystem(m_systemIndex);
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OnEntityRemoved(entity); // And we alert our callback
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}
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/*!
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* \brief Validates an entity to a system
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*
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* \param entity Pointer to the entity
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* \param justAdded Is the entity newly added
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*
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* \remark Produces a NazaraAssert if entity is invalid or if system does not hold this entity
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*/
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inline void BaseSystem::ValidateEntity(Entity* entity, bool justAdded)
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{
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NazaraAssert(entity, "Invalid entity");
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NazaraAssert(HasEntity(entity), "Entity should be part of system");
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OnEntityValidation(entity, justAdded);
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}
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/*!
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* \brief Sets the world on which the system operates
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*/
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inline void BaseSystem::SetWorld(World* world) noexcept
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{
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m_world = world;
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}
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/*!
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* \brief Initializes the BaseSystem
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* \return true
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*/
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inline bool BaseSystem::Initialize()
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{
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s_nextIndex = 0;
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return true;
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}
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/*!
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* \brief Uninitialize the BaseSystem
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*/
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inline void BaseSystem::Uninitialize()
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{
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// Nothing to do
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}
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}
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