78 lines
2.2 KiB
C++
78 lines
2.2 KiB
C++
// Copyright (C) 2022 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
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// This file is part of the "Nazara Engine - Core module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Core/Systems/SystemGraph.hpp>
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#include <Nazara/Core/Error.hpp>
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#include <stdexcept>
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#include <Nazara/Core/Debug.hpp>
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namespace Nz
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{
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namespace Detail
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{
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template<typename, typename = void>
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struct SystemGraphAllowConcurrent : std::bool_constant<true> {};
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template<typename T>
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struct SystemGraphAllowConcurrent<T, std::void_t<decltype(T::AllowConcurrent)>> : std::bool_constant<T::AllowConcurrent> {};
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template<typename, typename = void>
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struct SystemGraphExecutionOrder : std::integral_constant<Int64, 0> {};
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template<typename T>
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struct SystemGraphExecutionOrder<T, std::void_t<decltype(T::ExecutionOrder)>> : std::integral_constant<Int64, T::ExecutionOrder> {};
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}
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template<typename T>
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template<typename... Args>
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SystemGraph::Node<T>::Node(Args&&... args) :
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system(std::forward<Args>(args)...)
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{
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}
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template<typename T>
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void SystemGraph::Node<T>::Update(Time elapsedTime)
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{
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system.Update(elapsedTime);
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}
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inline SystemGraph::SystemGraph(entt::registry& registry) :
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m_registry(registry),
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m_systemOrderUpdated(true)
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{
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}
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template<typename T, typename... Args>
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T& SystemGraph::AddSystem(Args&&... args)
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{
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NazaraAssert(m_systemToNodes.find(entt::type_hash<T>()) == m_systemToNodes.end(), "this system already exists");
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auto nodePtr = std::make_unique<Node<T>>(m_registry, std::forward<Args>(args)...);
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nodePtr->executionOrder = Detail::SystemGraphExecutionOrder<T>();
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T& system = nodePtr->system;
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std::size_t nodeIndex = m_nodes.size();
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m_nodes.emplace_back(std::move(nodePtr));
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m_systemToNodes.emplace(entt::type_hash<T>(), nodeIndex);
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m_systemOrderUpdated = false;
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return system;
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}
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template<typename T>
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T& SystemGraph::GetSystem() const
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{
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auto it = m_systemToNodes.find(entt::type_hash<T>());
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if (it == m_systemToNodes.end())
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throw std::runtime_error("this system is not part of the graph");
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auto& node = static_cast<Node<T>&>(*m_nodes[it->second]);
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return node.system;
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}
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}
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#include <Nazara/Core/DebugOff.hpp>
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