71 lines
1.9 KiB
C++
71 lines
1.9 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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namespace Ndk
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{
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namespace Detail
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{
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template<bool HasDefaultConstructor>
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struct AddComponentIf;
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template<>
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struct AddComponentIf<true>
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{
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template<typename T>
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static int AddComponent(Nz::LuaState& lua, EntityHandle& handle)
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{
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T& component = handle->AddComponent<T>();
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lua.Push(component.CreateHandle());
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return 1;
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}
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};
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template<>
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struct AddComponentIf<false>
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{
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template<typename T>
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static int AddComponent(Nz::LuaState& lua, EntityHandle& /*handle*/)
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{
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lua.Error("Component has no default constructor and cannot be created from Lua yet");
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return 0;
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}
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};
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}
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/*!
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* \brief Binds a component to a name
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*
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* \param name Name used to retrieve the component
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*
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* \remark Produces a NazaraAssert if name is empty
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*/
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template<typename T>
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void LuaBinding::BindComponent(const Nz::String& name)
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{
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NazaraAssert(!name.IsEmpty(), "Component name cannot be empty");
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static_assert(std::is_base_of<BaseComponent, T>::value, "ComponentType must inherit BaseComponent");
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ComponentBinding binding;
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binding.adder = &Detail::AddComponentIf<std::is_default_constructible<T>::value>::template AddComponent<T>;
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binding.getter = &PushComponentOfType<T>;
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binding.index = T::componentIndex;
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binding.name = name;
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if (m_componentBinding.size() <= T::componentIndex)
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m_componentBinding.resize(T::componentIndex + 1);
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m_componentBinding[T::componentIndex] = std::move(binding);
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m_componentBindingByName[name] = T::componentIndex;
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}
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template<typename T>
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int LuaBinding::PushComponentOfType(Nz::LuaState& lua, BaseComponent& component)
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{
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T& rightComponent = static_cast<T&>(component);
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lua.Push(rightComponent.CreateHandle());
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return 1;
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}
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}
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