1657 lines
59 KiB
C++
1657 lines
59 KiB
C++
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// This work derives from Vittorio Romeo's code used for cppcon 2015 licensed
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// under the Academic Free License.
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// His code is available here: https://github.com/SuperV1234/cppcon2015
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#ifndef EC_MANAGER_HPP
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#define EC_MANAGER_HPP
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#define EC_INIT_ENTITIES_SIZE 256
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#define EC_GROW_SIZE_AMOUNT 256
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#include <cstddef>
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#include <vector>
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#include <tuple>
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#include <utility>
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#include <functional>
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#include <map>
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#include <unordered_map>
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#include <set>
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#include <unordered_set>
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#include <algorithm>
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#include <thread>
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#include <mutex>
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#include <type_traits>
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#ifndef NDEBUG
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#include <iostream>
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#endif
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#include "Meta/Combine.hpp"
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#include "Meta/Matching.hpp"
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#include "Meta/ForEachWithIndex.hpp"
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#include "Meta/ForEachDoubleTuple.hpp"
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#include "Meta/IndexOf.hpp"
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#include "Bitset.hpp"
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namespace EC
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{
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/*!
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\brief Manages an EntityComponent system.
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EC::Manager must be created with a list of all used Components and all
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used tags.
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Note that all components must have a default constructor.
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Example:
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\code{.cpp}
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EC::Manager<TypeList<C0, C1, C2>, TypeList<T0, T1>> manager;
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\endcode
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*/
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template <typename ComponentsList, typename TagsList>
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struct Manager
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{
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public:
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using Components = ComponentsList;
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using Tags = TagsList;
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using Combined = EC::Meta::Combine<ComponentsList, TagsList>;
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using BitsetType = EC::Bitset<ComponentsList, TagsList>;
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private:
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using ComponentsTuple = EC::Meta::Morph<ComponentsList, std::tuple<> >;
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static_assert(std::is_default_constructible<ComponentsTuple>::value,
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"All components must be default constructible");
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template <typename... Types>
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struct Storage
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{
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using type = std::tuple<std::vector<Types>..., std::vector<char> >;
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};
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using ComponentsStorage =
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typename EC::Meta::Morph<ComponentsList, Storage<> >::type;
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// Entity: isAlive, ComponentsTags Info
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using EntitiesTupleType = std::tuple<bool, BitsetType>;
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using EntitiesType = std::vector<EntitiesTupleType>;
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EntitiesType entities;
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ComponentsStorage componentsStorage;
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std::size_t currentCapacity = 0;
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std::size_t currentSize = 0;
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std::unordered_set<std::size_t> deletedSet;
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public:
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/*!
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\brief Initializes the manager with a default capacity.
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The default capacity is set with macro EC_INIT_ENTITIES_SIZE,
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and will grow by amounts of EC_GROW_SIZE_AMOUNT when needed.
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*/
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Manager()
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{
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resize(EC_INIT_ENTITIES_SIZE);
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}
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private:
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void resize(std::size_t newCapacity)
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{
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if(currentCapacity >= newCapacity)
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{
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return;
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}
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EC::Meta::forEach<ComponentsList>([this, newCapacity] (auto t) {
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std::get<std::vector<decltype(t)> >(
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this->componentsStorage).resize(newCapacity);
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});
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entities.resize(newCapacity);
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for(std::size_t i = currentCapacity; i < newCapacity; ++i)
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{
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entities[i] = std::make_tuple(false, BitsetType{});
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}
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currentCapacity = newCapacity;
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}
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public:
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/*!
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\brief Adds an entity to the system, returning the ID of the entity.
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Note: The ID of an entity is guaranteed to not change.
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*/
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std::size_t addEntity()
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{
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if(deletedSet.empty())
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{
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if(currentSize == currentCapacity)
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{
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resize(currentCapacity + EC_GROW_SIZE_AMOUNT);
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}
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std::get<bool>(entities[currentSize]) = true;
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return currentSize++;
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}
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else
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{
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std::size_t id;
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{
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auto iter = deletedSet.begin();
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id = *iter;
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deletedSet.erase(iter);
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}
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std::get<bool>(entities[id]) = true;
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return id;
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}
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}
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/*!
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\brief Marks an entity for deletion.
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A deleted Entity's id is stored to be reclaimed later when
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addEntity is called. Thus calling addEntity may return an id of
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a previously deleted Entity.
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*/
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void deleteEntity(const std::size_t& index)
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{
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if(hasEntity(index))
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{
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std::get<bool>(entities.at(index)) = false;
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std::get<BitsetType>(entities.at(index)).reset();
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deletedSet.insert(index);
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}
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}
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/*!
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\brief Checks if the Entity with the given ID is in the system.
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Note that deleted Entities are still considered in the system.
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Consider using isAlive().
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*/
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bool hasEntity(const std::size_t& index) const
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{
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return index < currentSize;
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}
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/*!
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\brief Checks if the Entity is not marked as deleted.
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Note that invalid Entities (Entities where calls to hasEntity()
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returns false) will return false.
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*/
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bool isAlive(const std::size_t& index) const
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{
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return hasEntity(index) && std::get<bool>(entities.at(index));
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}
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/*!
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\brief Returns the current size or number of entities in the system.
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Note this function will only count entities where isAlive() returns
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true.
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*/
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std::size_t getCurrentSize() const
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{
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return currentSize - deletedSet.size();
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}
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/*
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\brief Returns the current capacity or number of entities the system
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can hold.
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Note that when capacity is exceeded, the capacity is increased by
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EC_GROW_SIZE_AMOUNT.
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*/
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std::size_t getCurrentCapacity() const
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{
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return currentCapacity;
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}
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/*!
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\brief Returns a const reference to an Entity's info.
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An Entity's info is a std::tuple with a bool, and a
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bitset.
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\n The bool determines if the Entity is alive.
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\n The bitset shows what Components and Tags belong to the Entity.
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*/
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const EntitiesTupleType& getEntityInfo(const std::size_t& index) const
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{
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return entities.at(index);
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}
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/*!
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\brief Returns a pointer to a component belonging to the given
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Entity.
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This function will return a pointer to a Component regardless of
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whether or not the Entity actually owns the Component. If the Entity
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doesn't own the Component, changes to the Component will not affect
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any Entity. It is recommended to use hasComponent() to determine if
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the Entity actually owns that Component.
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If the given Component is unknown to the Manager, then this function
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will return a nullptr.
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*/
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template <typename Component>
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Component* getEntityData(const std::size_t& index)
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{
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constexpr auto componentIndex = EC::Meta::IndexOf<
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Component, Components>::value;
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if(componentIndex < Components::size)
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{
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// Cast required due to compiler thinking that an invalid
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// Component is needed even though the enclosing if statement
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// prevents this from ever happening.
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return (Component*) &std::get<componentIndex>(
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componentsStorage).at(index);
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}
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else
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{
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return nullptr;
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}
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}
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/*!
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\brief Returns a pointer to a component belonging to the given
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Entity.
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Note that this function is the same as getEntityData().
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This function will return a pointer to a Component regardless of
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whether or not the Entity actually owns the Component. If the Entity
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doesn't own the Component, changes to the Component will not affect
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any Entity. It is recommended to use hasComponent() to determine if
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the Entity actually owns that Component.
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If the given Component is unknown to the Manager, then this function
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will return a nullptr.
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*/
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template <typename Component>
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Component* getEntityComponent(const std::size_t& index)
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{
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return getEntityData<Component>(index);
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}
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/*!
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\brief Returns a const pointer to a component belonging to the
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given Entity.
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This function will return a const pointer to a Component
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regardless of whether or not the Entity actually owns the Component.
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If the Entity doesn't own the Component, changes to the Component
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will not affect any Entity. It is recommended to use hasComponent()
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to determine if the Entity actually owns that Component.
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If the given Component is unknown to the Manager, then this function
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will return a nullptr.
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*/
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template <typename Component>
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const Component* getEntityData(const std::size_t& index) const
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{
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constexpr auto componentIndex = EC::Meta::IndexOf<
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Component, Components>::value;
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if(componentIndex < Components::size)
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{
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// Cast required due to compiler thinking that an invalid
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// Component is needed even though the enclosing if statement
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// prevents this from ever happening.
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return (Component*) &std::get<componentIndex>(
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componentsStorage).at(index);
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}
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else
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{
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return nullptr;
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}
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}
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/*!
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\brief Returns a const pointer to a component belonging to the
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given Entity.
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Note that this function is the same as getEntityData() (const).
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This function will return a const pointer to a Component
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regardless of whether or not the Entity actually owns the Component.
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If the Entity doesn't own the Component, changes to the Component
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will not affect any Entity. It is recommended to use hasComponent()
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to determine if the Entity actually owns that Component.
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If the given Component is unknown to the Manager, then this function
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will return a nullptr.
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*/
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template <typename Component>
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const Component* getEntityComponent(const std::size_t& index) const
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{
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return getEntityData<Component>(index);
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}
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/*!
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\brief Checks whether or not the given Entity has the given
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Component.
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Example:
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\code{.cpp}
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manager.hasComponent<C0>(entityID);
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\endcode
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*/
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template <typename Component>
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bool hasComponent(const std::size_t& index) const
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{
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return std::get<BitsetType>(
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entities.at(index)).template getComponentBit<Component>();
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}
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/*!
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\brief Checks whether or not the given Entity has the given Tag.
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Example:
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\code{.cpp}
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manager.hasTag<T0>(entityID);
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\endcode
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*/
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template <typename Tag>
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bool hasTag(const std::size_t& index) const
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{
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return std::get<BitsetType>(
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entities.at(index)).template getTagBit<Tag>();
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}
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/*!
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\brief Adds a component to the given Entity.
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Additional parameters given to this function will construct the
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Component with those parameters.
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Note that if the Entity already has the same component, then it
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will be overwritten by the newly created Component with the given
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arguments.
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If the Entity is not alive or the given Component is not known to
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the Manager, then nothing will change.
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Example:
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\code{.cpp}
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struct C0
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{
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// constructor is compatible as a default constructor
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C0(int a = 0, char b = 'b') :
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a(a), b(b)
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{}
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int a;
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char b;
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}
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manager.addComponent<C0>(entityID, 10, 'd');
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\endcode
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*/
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template <typename Component, typename... Args>
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void addComponent(const std::size_t& entityID, Args&&... args)
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{
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if(!EC::Meta::Contains<Component, Components>::value
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|| !isAlive(entityID))
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{
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return;
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}
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Component component(std::forward<Args>(args)...);
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std::get<BitsetType>(
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entities[entityID]
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).template getComponentBit<Component>() = true;
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constexpr auto index =
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EC::Meta::IndexOf<Component, Components>::value;
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// Cast required due to compiler thinking that vector<char> at
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// index = Components::size is being used, even if the previous
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// if statement will prevent this from ever happening.
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(*((std::vector<Component>*)(&std::get<index>(
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componentsStorage
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))))[entityID] = std::move(component);
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}
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/*!
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\brief Removes the given Component from the given Entity.
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If the Entity does not have the Component given, nothing will
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change.
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Example:
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\code{.cpp}
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manager.removeComponent<C0>(entityID);
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\endcode
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*/
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template <typename Component>
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void removeComponent(const std::size_t& entityID)
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{
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if(!EC::Meta::Contains<Component, Components>::value
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|| !isAlive(entityID))
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{
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return;
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}
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std::get<BitsetType>(
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entities[entityID]
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).template getComponentBit<Component>() = false;
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}
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/*!
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\brief Adds the given Tag to the given Entity.
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Example:
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\code{.cpp}
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manager.addTag<T0>(entityID);
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\endcode
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*/
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template <typename Tag>
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void addTag(const std::size_t& entityID)
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{
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if(!EC::Meta::Contains<Tag, Tags>::value
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|| !isAlive(entityID))
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{
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return;
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}
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std::get<BitsetType>(
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entities[entityID]
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).template getTagBit<Tag>() = true;
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}
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/*!
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\brief Removes the given Tag from the given Entity.
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If the Entity does not have the Tag given, nothing will change.
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Example:
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\code{.cpp}
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manager.removeTag<T0>(entityID);
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\endcode
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*/
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template <typename Tag>
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void removeTag(const std::size_t& entityID)
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{
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if(!EC::Meta::Contains<Tag, Tags>::value
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|| !isAlive(entityID))
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{
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return;
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}
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std::get<BitsetType>(
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entities[entityID]
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).template getTagBit<Tag>() = false;
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}
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private:
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template <typename... Types>
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struct ForMatchingSignatureHelper
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{
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template <typename CType, typename Function>
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static void call(
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const std::size_t& entityID,
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CType& ctype,
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Function&& function,
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void* context = nullptr)
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{
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function(
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entityID,
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context,
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ctype.template getEntityData<Types>(entityID)...
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);
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}
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template <typename CType, typename Function>
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static void callPtr(
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const std::size_t& entityID,
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CType& ctype,
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Function* function,
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void* context = nullptr)
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{
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(*function)(
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entityID,
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context,
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ctype.template getEntityData<Types>(entityID)...
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);
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}
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template <typename CType, typename Function>
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void callInstance(
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const std::size_t& entityID,
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CType& ctype,
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Function&& function,
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void* context = nullptr) const
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{
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ForMatchingSignatureHelper<Types...>::call(
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entityID,
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ctype,
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std::forward<Function>(function),
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context);
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}
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template <typename CType, typename Function>
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void callInstancePtr(
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const std::size_t& entityID,
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CType& ctype,
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Function* function,
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void* context = nullptr) const
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{
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ForMatchingSignatureHelper<Types...>::callPtr(
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entityID,
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ctype,
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function,
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context);
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}
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};
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|
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public:
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/*!
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\brief Calls the given function on all Entities matching the given
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Signature.
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The function object given to this function must accept std::size_t
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as its first parameter, void* as its second parameter, and Component
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pointers for the rest of the parameters. Tags specified in the
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Signature are only used as filters and will not be given as a
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parameter to the function.
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The second parameter is default nullptr and will be passed to the
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function call as the second parameter as a means of providing
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context (useful when the function is not a lambda function). The
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third parameter is default 1 (not multi-threaded). If the third
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parameter threadCount is set to a value greater than 1, then
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threadCount threads will be used. Note that multi-threading is
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based on splitting the task of calling the function across sections
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of entities. Thus if there are only a small amount of entities in
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the manager, then using multiple threads may not have as great of a
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speed-up.
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Example:
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\code{.cpp}
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Context c; // some class/struct with data
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manager.forMatchingSignature<TypeList<C0, C1, T0>>([]
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(std::size_t ID,
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void* context,
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C0* component0, C1* component1)
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{
|
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// Lambda function contents here
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},
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&c, // "Context" object passed to the function
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4 // four threads
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);
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\endcode
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Note, the ID given to the function is not permanent. An entity's ID
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may change when cleanup() is called.
|
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*/
|
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template <typename Signature, typename Function>
|
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void forMatchingSignature(Function&& function,
|
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void* context = nullptr,
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std::size_t threadCount = 1)
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{
|
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using SignatureComponents =
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typename EC::Meta::Matching<Signature, ComponentsList>::type;
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using Helper =
|
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EC::Meta::Morph<
|
|
SignatureComponents,
|
|
ForMatchingSignatureHelper<> >;
|
|
|
|
BitsetType signatureBitset =
|
|
BitsetType::template generateBitset<Signature>();
|
|
if(threadCount <= 1)
|
|
{
|
|
for(std::size_t i = 0; i < currentSize; ++i)
|
|
{
|
|
if(!std::get<bool>(entities[i]))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
if((signatureBitset & std::get<BitsetType>(entities[i]))
|
|
== signatureBitset)
|
|
{
|
|
Helper::call(i, *this,
|
|
std::forward<Function>(function), context);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
std::vector<std::thread> threads(threadCount);
|
|
std::size_t s = currentSize / threadCount;
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
std::size_t begin = s * i;
|
|
std::size_t end;
|
|
if(i == threadCount - 1)
|
|
{
|
|
end = currentSize;
|
|
}
|
|
else
|
|
{
|
|
end = s * (i + 1);
|
|
}
|
|
threads[i] = std::thread(
|
|
[this, &function, &signatureBitset, &context]
|
|
(std::size_t begin,
|
|
std::size_t end) {
|
|
for(std::size_t i = begin; i < end; ++i)
|
|
{
|
|
if(!std::get<bool>(this->entities[i]))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
if((signatureBitset
|
|
& std::get<BitsetType>(entities[i]))
|
|
== signatureBitset)
|
|
{
|
|
Helper::call(i, *this,
|
|
std::forward<Function>(function), context);
|
|
}
|
|
}
|
|
},
|
|
begin,
|
|
end);
|
|
}
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
threads[i].join();
|
|
}
|
|
}
|
|
}
|
|
|
|
/*!
|
|
\brief Calls the given function on all Entities matching the given
|
|
Signature.
|
|
|
|
The function pointer given to this function must accept std::size_t
|
|
as its first parameter, void* as its second parameter, and
|
|
Component pointers for the rest of the parameters. Tags specified in
|
|
the Signature are only used as filters and will not be given as a
|
|
parameter to the function.
|
|
|
|
The second parameter is default nullptr and will be passed to the
|
|
function call as the second parameter as a means of providing
|
|
context (useful when the function is not a lambda function). The
|
|
third parameter is default 1 (not multi-threaded). If the third
|
|
parameter threadCount is set to a value greater than 1, then
|
|
threadCount threads will be used. Note that multi-threading is based
|
|
on splitting the task of calling the function across sections of
|
|
entities. Thus if there are only a small amount of entities in the
|
|
manager, then using multiple threads may not have as great of a
|
|
speed-up.
|
|
|
|
Example:
|
|
\code{.cpp}
|
|
Context c; // some class/struct with data
|
|
auto function = []
|
|
(std::size_t ID,
|
|
void* context,
|
|
C0* component0, C1* component1)
|
|
{
|
|
// Lambda function contents here
|
|
};
|
|
manager.forMatchingSignaturePtr<TypeList<C0, C1, T0>>(
|
|
&function, // ptr
|
|
&c, // "Context" object passed to the function
|
|
4 // four threads
|
|
);
|
|
\endcode
|
|
Note, the ID given to the function is not permanent. An entity's ID
|
|
may change when cleanup() is called.
|
|
*/
|
|
template <typename Signature, typename Function>
|
|
void forMatchingSignaturePtr(Function* function,
|
|
void* context = nullptr,
|
|
std::size_t threadCount = 1)
|
|
{
|
|
using SignatureComponents =
|
|
typename EC::Meta::Matching<Signature, ComponentsList>::type;
|
|
using Helper =
|
|
EC::Meta::Morph<
|
|
SignatureComponents,
|
|
ForMatchingSignatureHelper<> >;
|
|
|
|
BitsetType signatureBitset =
|
|
BitsetType::template generateBitset<Signature>();
|
|
if(threadCount <= 1)
|
|
{
|
|
for(std::size_t i = 0; i < currentSize; ++i)
|
|
{
|
|
if(!std::get<bool>(entities[i]))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
if((signatureBitset & std::get<BitsetType>(entities[i]))
|
|
== signatureBitset)
|
|
{
|
|
Helper::callPtr(i, *this, function, context);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
std::vector<std::thread> threads(threadCount);
|
|
std::size_t s = currentSize / threadCount;
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
std::size_t begin = s * i;
|
|
std::size_t end;
|
|
if(i == threadCount - 1)
|
|
{
|
|
end = currentSize;
|
|
}
|
|
else
|
|
{
|
|
end = s * (i + 1);
|
|
}
|
|
threads[i] = std::thread(
|
|
[this, &function, &signatureBitset, &context]
|
|
(std::size_t begin,
|
|
std::size_t end) {
|
|
for(std::size_t i = begin; i < end; ++i)
|
|
{
|
|
if(!std::get<bool>(this->entities[i]))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
if((signatureBitset
|
|
& std::get<BitsetType>(entities[i]))
|
|
== signatureBitset)
|
|
{
|
|
Helper::callPtr(i, *this, function, context);
|
|
}
|
|
}
|
|
},
|
|
begin,
|
|
end);
|
|
}
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
threads[i].join();
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
private:
|
|
std::map<std::size_t, std::tuple<
|
|
BitsetType,
|
|
void*,
|
|
std::function<void(
|
|
std::size_t,
|
|
std::vector<std::size_t>,
|
|
void*)> > >
|
|
forMatchingFunctions;
|
|
std::size_t functionIndex = 0;
|
|
|
|
public:
|
|
/*!
|
|
\brief Stores a function in the manager to be called later.
|
|
|
|
As an alternative to calling functions directly with
|
|
forMatchingSignature(), functions can be stored in the manager to
|
|
be called later with callForMatchingFunctions() and
|
|
callForMatchingFunction, and removed with
|
|
clearForMatchingFunctions() and removeForMatchingFunction().
|
|
|
|
The syntax for the Function is the same as with
|
|
forMatchingSignature().
|
|
|
|
Note that functions will be called in the same order they are
|
|
inserted if called by callForMatchingFunctions() unless the
|
|
internal functionIndex counter has wrapped around (is a
|
|
std::size_t). Calling clearForMatchingFunctions() will reset this
|
|
counter to zero.
|
|
|
|
Note that the context pointer provided here (default nullptr) will
|
|
be provided to the stored function when called.
|
|
|
|
Example:
|
|
\code{.cpp}
|
|
manager.addForMatchingFunction<TypeList<C0, C1, T0>>([]
|
|
(std::size_t ID,
|
|
void* context,
|
|
C0* component0, C1* component1)
|
|
{
|
|
// Lambda function contents here
|
|
});
|
|
|
|
// call all stored functions
|
|
manager.callForMatchingFunctions();
|
|
|
|
// remove all stored functions
|
|
manager.clearForMatchingFunctions();
|
|
\endcode
|
|
|
|
\return The index of the function, used for deletion with
|
|
deleteForMatchingFunction() or filtering with
|
|
keepSomeMatchingFunctions() or removeSomeMatchingFunctions(),
|
|
or calling with callForMatchingFunction().
|
|
*/
|
|
template <typename Signature, typename Function>
|
|
std::size_t addForMatchingFunction(
|
|
Function&& function,
|
|
void* context = nullptr)
|
|
{
|
|
while(forMatchingFunctions.find(functionIndex)
|
|
!= forMatchingFunctions.end())
|
|
{
|
|
++functionIndex;
|
|
}
|
|
|
|
using SignatureComponents =
|
|
typename EC::Meta::Matching<Signature, ComponentsList>::type;
|
|
using Helper =
|
|
EC::Meta::Morph<
|
|
SignatureComponents,
|
|
ForMatchingSignatureHelper<> >;
|
|
|
|
Helper helper;
|
|
BitsetType signatureBitset =
|
|
BitsetType::template generateBitset<Signature>();
|
|
|
|
forMatchingFunctions.emplace(std::make_pair(
|
|
functionIndex,
|
|
std::make_tuple(
|
|
signatureBitset,
|
|
context,
|
|
[function, helper, this]
|
|
(std::size_t threadCount,
|
|
std::vector<std::size_t> matching,
|
|
void* context)
|
|
{
|
|
if(threadCount <= 1)
|
|
{
|
|
for(auto eid : matching)
|
|
{
|
|
if(isAlive(eid))
|
|
{
|
|
helper.callInstancePtr(
|
|
eid, *this, &function, context);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
std::vector<std::thread> threads(threadCount);
|
|
std::size_t s = matching.size() / threadCount;
|
|
for(std::size_t i = 0; i < threadCount; ++ i)
|
|
{
|
|
std::size_t begin = s * i;
|
|
std::size_t end;
|
|
if(i == threadCount - 1)
|
|
{
|
|
end = matching.size();
|
|
}
|
|
else
|
|
{
|
|
end = s * (i + 1);
|
|
}
|
|
threads[i] = std::thread(
|
|
[this, &function, &helper, &context]
|
|
(std::size_t begin,
|
|
std::size_t end) {
|
|
for(std::size_t i = begin; i < end; ++i)
|
|
{
|
|
if(isAlive(i))
|
|
{
|
|
helper.callInstancePtr(
|
|
i, *this, &function, context);
|
|
}
|
|
}
|
|
},
|
|
begin, end);
|
|
}
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
threads[i].join();
|
|
}
|
|
}
|
|
})));
|
|
|
|
return functionIndex++;
|
|
}
|
|
|
|
private:
|
|
std::vector<std::vector<std::size_t> > getMatchingEntities(
|
|
std::vector<BitsetType*> bitsets, std::size_t threadCount = 1)
|
|
{
|
|
std::vector<std::vector<std::size_t> > matchingV(bitsets.size());
|
|
|
|
if(threadCount <= 1)
|
|
{
|
|
for(std::size_t i = 0; i < currentSize; ++i)
|
|
{
|
|
if(!isAlive(i))
|
|
{
|
|
continue;
|
|
}
|
|
for(std::size_t j = 0; j < bitsets.size(); ++j)
|
|
{
|
|
if(((*bitsets[j]) & std::get<BitsetType>(entities[i]))
|
|
== (*bitsets[j]))
|
|
{
|
|
matchingV[j].push_back(i);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
std::vector<std::thread> threads(threadCount);
|
|
std::size_t s = currentSize / threadCount;
|
|
std::mutex mutex;
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
std::size_t begin = s * i;
|
|
std::size_t end;
|
|
if(i == threadCount - 1)
|
|
{
|
|
end = currentSize;
|
|
}
|
|
else
|
|
{
|
|
end = s * (i + 1);
|
|
}
|
|
threads[i] = std::thread(
|
|
[this, &matchingV, &bitsets, &mutex]
|
|
(std::size_t begin, std::size_t end)
|
|
{
|
|
for(std::size_t j = begin; j < end; ++j)
|
|
{
|
|
if(!isAlive(j))
|
|
{
|
|
continue;
|
|
}
|
|
for(std::size_t k = 0; k < bitsets.size(); ++k)
|
|
{
|
|
if(((*bitsets[k]) &
|
|
std::get<BitsetType>(entities[j]))
|
|
== (*bitsets[k]))
|
|
{
|
|
std::lock_guard<std::mutex> guard(mutex);
|
|
matchingV[k].push_back(j);
|
|
}
|
|
}
|
|
}
|
|
}, begin, end);
|
|
}
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
threads[i].join();
|
|
}
|
|
}
|
|
|
|
return matchingV;
|
|
}
|
|
|
|
public:
|
|
|
|
/*!
|
|
\brief Call all stored functions.
|
|
|
|
The first (and only) parameter can be optionally used to specify the
|
|
number of threads to use when calling the functions. Otherwise, this
|
|
function is by default not multi-threaded.
|
|
Note that multi-threading is based on splitting the task of calling
|
|
the functions across sections of entities. Thus if there are only
|
|
a small amount of entities in the manager, then using multiple
|
|
threads may not have as great of a speed-up.
|
|
|
|
Example:
|
|
\code{.cpp}
|
|
manager.addForMatchingFunction<TypeList<C0, C1, T0>>([]
|
|
(std::size_t ID,
|
|
void* context,
|
|
C0* component0, C1* component1) {
|
|
// Lambda function contents here
|
|
});
|
|
|
|
// call all stored functions
|
|
manager.callForMatchingFunctions();
|
|
|
|
// call all stored functions with 4 threads
|
|
manager.callForMatchingFunctions(4);
|
|
|
|
// remove all stored functions
|
|
manager.clearForMatchingFunctions();
|
|
\endcode
|
|
*/
|
|
void callForMatchingFunctions(std::size_t threadCount = 1)
|
|
{
|
|
std::vector<BitsetType*> bitsets;
|
|
for(auto iter = forMatchingFunctions.begin();
|
|
iter != forMatchingFunctions.end();
|
|
++iter)
|
|
{
|
|
bitsets.push_back(&std::get<BitsetType>(iter->second));
|
|
}
|
|
|
|
std::vector<std::vector<std::size_t> > matching =
|
|
getMatchingEntities(bitsets, threadCount);
|
|
|
|
std::size_t i = 0;
|
|
for(auto iter = forMatchingFunctions.begin();
|
|
iter != forMatchingFunctions.end();
|
|
++iter)
|
|
{
|
|
std::get<2>(iter->second)(
|
|
threadCount, matching[i++], std::get<1>(iter->second));
|
|
}
|
|
}
|
|
|
|
/*!
|
|
\brief Call a specific stored function.
|
|
|
|
A second parameter can be optionally used to specify the number
|
|
of threads to use when calling the function. Otherwise, this
|
|
function is by default not multi-threaded.
|
|
Note that multi-threading is based on splitting the task of calling
|
|
the function across sections of entities. Thus if there are only
|
|
a small amount of entities in the manager, then using multiple
|
|
threads may not have as great of a speed-up.
|
|
|
|
Example:
|
|
\code{.cpp}
|
|
std::size_t id =
|
|
manager.addForMatchingFunction<TypeList<C0, C1, T0>>(
|
|
[] (std::size_t ID, void* context, C0* c0, C1* c1) {
|
|
// Lambda function contents here
|
|
});
|
|
|
|
// call the previously added function
|
|
manager.callForMatchingFunction(id);
|
|
|
|
// call the previously added function with 4 threads
|
|
manager.callForMatchingFunction(id, 4);
|
|
\endcode
|
|
|
|
\return False if a function with the given id does not exist.
|
|
*/
|
|
bool callForMatchingFunction(std::size_t id,
|
|
std::size_t threadCount = 1)
|
|
{
|
|
auto iter = forMatchingFunctions.find(id);
|
|
if(iter == forMatchingFunctions.end())
|
|
{
|
|
return false;
|
|
}
|
|
std::vector<std::vector<std::size_t> > matching =
|
|
getMatchingEntities(std::vector<BitsetType*>{
|
|
&std::get<BitsetType>(iter->second)}, threadCount);
|
|
std::get<2>(iter->second)(
|
|
threadCount, matching[0], std::get<1>(iter->second));
|
|
return true;
|
|
}
|
|
|
|
/*!
|
|
\brief Remove all stored functions.
|
|
|
|
Also resets the index counter of stored functions to 0.
|
|
|
|
Example:
|
|
\code{.cpp}
|
|
manager.addForMatchingFunction<TypeList<C0, C1, T0>>([]
|
|
(std::size_t ID,
|
|
void* context,
|
|
C0* component0, C1* component1)
|
|
{
|
|
// Lambda function contents here
|
|
});
|
|
|
|
// call all stored functions
|
|
manager.callForMatchingFunctions();
|
|
|
|
// remove all stored functions
|
|
manager.clearForMatchingFunctions();
|
|
\endcode
|
|
*/
|
|
void clearForMatchingFunctions()
|
|
{
|
|
forMatchingFunctions.clear();
|
|
functionIndex = 0;
|
|
}
|
|
|
|
/*!
|
|
\brief Removes a function that has the given id.
|
|
|
|
\return True if a function was erased.
|
|
*/
|
|
bool removeForMatchingFunction(std::size_t id)
|
|
{
|
|
return forMatchingFunctions.erase(id) == 1;
|
|
}
|
|
|
|
/*!
|
|
\brief Removes all functions that do not have the index specified
|
|
in argument "list".
|
|
|
|
The given List must be iterable.
|
|
This is the only requirement, so a set could also be given.
|
|
|
|
\return The number of functions deleted.
|
|
*/
|
|
template <typename List>
|
|
std::size_t keepSomeMatchingFunctions(List list)
|
|
{
|
|
std::size_t deletedCount = 0;
|
|
for(auto iter = forMatchingFunctions.begin();
|
|
iter != forMatchingFunctions.end();)
|
|
{
|
|
if(std::find(list.begin(), list.end(), iter->first)
|
|
== list.end())
|
|
{
|
|
iter = forMatchingFunctions.erase(iter);
|
|
++deletedCount;
|
|
}
|
|
else
|
|
{
|
|
++iter;
|
|
}
|
|
}
|
|
|
|
return deletedCount;
|
|
}
|
|
|
|
/*!
|
|
\brief Removes all functions that do not have the index specified
|
|
in argument "list".
|
|
|
|
This function allows for passing an initializer list.
|
|
|
|
\return The number of functions deleted.
|
|
*/
|
|
std::size_t keepSomeMatchingFunctions(
|
|
std::initializer_list<std::size_t> list)
|
|
{
|
|
return keepSomeMatchingFunctions<decltype(list)>(list);
|
|
}
|
|
|
|
/*!
|
|
\brief Removes all functions that do have the index specified
|
|
in argument "list".
|
|
|
|
The given List must be iterable.
|
|
This is the only requirement, so a set could also be given.
|
|
|
|
\return The number of functions deleted.
|
|
*/
|
|
template <typename List>
|
|
std::size_t removeSomeMatchingFunctions(List list)
|
|
{
|
|
std::size_t deletedCount = 0;
|
|
for(auto listIter = list.begin();
|
|
listIter != list.end();
|
|
++listIter)
|
|
{
|
|
deletedCount += forMatchingFunctions.erase(*listIter);
|
|
}
|
|
|
|
return deletedCount;
|
|
}
|
|
|
|
/*!
|
|
\brief Removes all functions that do have the index specified
|
|
in argument "list".
|
|
|
|
This function allows for passing an initializer list.
|
|
|
|
\return The number of functions deleted.
|
|
*/
|
|
std::size_t removeSomeMatchingFunctions(
|
|
std::initializer_list<std::size_t> list)
|
|
{
|
|
return removeSomeMatchingFunctions<decltype(list)>(list);
|
|
}
|
|
|
|
/*!
|
|
\brief Deletes the specified function.
|
|
|
|
The index of a function is returned from addForMatchingFunction()
|
|
so there is no other way to get the index of a function.
|
|
|
|
\return True if function existed and has been deleted.
|
|
*/
|
|
bool deleteForMatchingFunction(std::size_t index)
|
|
{
|
|
return forMatchingFunctions.erase(index) == 1;
|
|
}
|
|
|
|
/*!
|
|
\brief Sets the context pointer of a stored function
|
|
|
|
\return True if id is valid and context was updated
|
|
*/
|
|
bool changeForMatchingFunctionContext(std::size_t id, void* context)
|
|
{
|
|
auto f = forMatchingFunctions.find(id);
|
|
if(f != forMatchingFunctions.end())
|
|
{
|
|
std::get<1>(f->second) = context;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/*!
|
|
\brief Call multiple functions with mulitple signatures on all
|
|
living entities.
|
|
|
|
(Living entities as in entities that have not been marked for
|
|
deletion.)
|
|
|
|
This function requires the first template parameter to be a
|
|
EC::Meta::TypeList of signatures. Note that a signature is a
|
|
EC::Meta::TypeList of components and tags, meaning that SigList
|
|
is a TypeList of TypeLists.
|
|
|
|
The second template parameter can be inferred from the function
|
|
parameter which should be a tuple of functions. The function
|
|
at any index in the tuple should match with a signature of the
|
|
same index in the SigList. Behavior is undefined if there are
|
|
less functions than signatures.
|
|
|
|
See the Unit Test of this function in src/test/ECTest.cpp for
|
|
usage examples.
|
|
|
|
The second parameter (default nullptr) will be provided to every
|
|
function call as a void* (context).
|
|
|
|
This function was created for the use case where there are many
|
|
entities in the system which can cause multiple calls to
|
|
forMatchingSignature to be slow due to the overhead of iterating
|
|
through the entire list of entities on each invocation.
|
|
This function instead iterates through all entities once,
|
|
storing matching entities in a vector of vectors (for each
|
|
signature and function pair) and then calling functions with
|
|
the matching list of entities.
|
|
|
|
Note that multi-threaded or not, functions will be called in order
|
|
of signatures. The first function signature pair will be called
|
|
first, then the second, third, and so on.
|
|
If this function is called with more than 1 thread specified, then
|
|
the order of entities called is not guaranteed. Otherwise entities
|
|
will be called in consecutive order by their ID.
|
|
*/
|
|
template <typename SigList, typename FTuple>
|
|
void forMatchingSignatures(
|
|
FTuple fTuple,
|
|
void* context = nullptr,
|
|
const std::size_t threadCount = 1)
|
|
{
|
|
std::vector<std::vector<std::size_t> > multiMatchingEntities(
|
|
SigList::size);
|
|
BitsetType signatureBitsets[SigList::size];
|
|
|
|
// generate bitsets for each signature
|
|
EC::Meta::forEachWithIndex<SigList>(
|
|
[&signatureBitsets] (auto signature, const auto index) {
|
|
signatureBitsets[index] =
|
|
BitsetType::template generateBitset
|
|
<decltype(signature)>();
|
|
});
|
|
|
|
// find and store entities matching signatures
|
|
if(threadCount <= 1)
|
|
{
|
|
for(std::size_t eid = 0; eid < currentSize; ++eid)
|
|
{
|
|
if(!isAlive(eid))
|
|
{
|
|
continue;
|
|
}
|
|
for(std::size_t i = 0; i < SigList::size; ++i)
|
|
{
|
|
if((signatureBitsets[i]
|
|
& std::get<BitsetType>(entities[eid]))
|
|
== signatureBitsets[i])
|
|
{
|
|
multiMatchingEntities[i].push_back(eid);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
std::vector<std::thread> threads(threadCount);
|
|
std::mutex mutexes[SigList::size];
|
|
std::size_t s = currentSize / threadCount;
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
std::size_t begin = s * i;
|
|
std::size_t end;
|
|
if(i == threadCount - 1)
|
|
{
|
|
end = currentSize;
|
|
}
|
|
else
|
|
{
|
|
end = s * (i + 1);
|
|
}
|
|
threads[i] = std::thread(
|
|
[this, &mutexes, &multiMatchingEntities, &signatureBitsets]
|
|
(std::size_t begin, std::size_t end)
|
|
{
|
|
for(std::size_t j = begin; j < end; ++j)
|
|
{
|
|
if(!isAlive(j))
|
|
{
|
|
continue;
|
|
}
|
|
for(std::size_t k = 0; k < SigList::size; ++k)
|
|
{
|
|
if((signatureBitsets[k]
|
|
& std::get<BitsetType>(entities[j]))
|
|
== signatureBitsets[k])
|
|
{
|
|
std::lock_guard<std::mutex> guard(
|
|
mutexes[k]);
|
|
multiMatchingEntities[k].push_back(j);
|
|
}
|
|
}
|
|
}
|
|
}, begin, end);
|
|
}
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
threads[i].join();
|
|
}
|
|
}
|
|
|
|
// call functions on matching entities
|
|
EC::Meta::forEachDoubleTuple(
|
|
EC::Meta::Morph<SigList, std::tuple<> >{},
|
|
fTuple,
|
|
[this, &multiMatchingEntities, &threadCount, &context]
|
|
(auto sig, auto func, auto index)
|
|
{
|
|
using SignatureComponents =
|
|
typename EC::Meta::Matching<
|
|
decltype(sig), ComponentsList>::type;
|
|
using Helper =
|
|
EC::Meta::Morph<
|
|
SignatureComponents,
|
|
ForMatchingSignatureHelper<> >;
|
|
if(threadCount <= 1)
|
|
{
|
|
for(const auto& id : multiMatchingEntities[index])
|
|
{
|
|
if(isAlive(id))
|
|
{
|
|
Helper::call(id, *this, func, context);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
std::vector<std::thread> threads(threadCount);
|
|
std::size_t s = multiMatchingEntities[index].size()
|
|
/ threadCount;
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
std::size_t begin = s * i;
|
|
std::size_t end;
|
|
if(i == threadCount - 1)
|
|
{
|
|
end = multiMatchingEntities[index].size();
|
|
}
|
|
else
|
|
{
|
|
end = s * (i + 1);
|
|
}
|
|
threads[i] = std::thread(
|
|
[this, &multiMatchingEntities, &index, &func,
|
|
&context]
|
|
(std::size_t begin, std::size_t end)
|
|
{
|
|
for(std::size_t j = begin; j < end;
|
|
++j)
|
|
{
|
|
if(isAlive(multiMatchingEntities[index][j]))
|
|
{
|
|
Helper::call(
|
|
multiMatchingEntities[index][j],
|
|
*this,
|
|
func,
|
|
context);
|
|
}
|
|
}
|
|
}, begin, end);
|
|
}
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
threads[i].join();
|
|
}
|
|
}
|
|
}
|
|
);
|
|
}
|
|
|
|
/*!
|
|
\brief Call multiple functions with mulitple signatures on all
|
|
living entities.
|
|
|
|
(Living entities as in entities that have not been marked for
|
|
deletion.)
|
|
|
|
Note that this function requires the tuple of functions to hold
|
|
pointers to functions, not just functions.
|
|
|
|
This function requires the first template parameter to be a
|
|
EC::Meta::TypeList of signatures. Note that a signature is a
|
|
EC::Meta::TypeList of components and tags, meaning that SigList
|
|
is a TypeList of TypeLists.
|
|
|
|
The second template parameter can be inferred from the function
|
|
parameter which should be a tuple of functions. The function
|
|
at any index in the tuple should match with a signature of the
|
|
same index in the SigList. Behavior is undefined if there are
|
|
less functions than signatures.
|
|
|
|
See the Unit Test of this function in src/test/ECTest.cpp for
|
|
usage examples.
|
|
|
|
The second parameter (default nullptr) will be provided to every
|
|
function call as a void* (context).
|
|
|
|
This function was created for the use case where there are many
|
|
entities in the system which can cause multiple calls to
|
|
forMatchingSignature to be slow due to the overhead of iterating
|
|
through the entire list of entities on each invocation.
|
|
This function instead iterates through all entities once,
|
|
storing matching entities in a vector of vectors (for each
|
|
signature and function pair) and then calling functions with
|
|
the matching list of entities.
|
|
|
|
Note that multi-threaded or not, functions will be called in order
|
|
of signatures. The first function signature pair will be called
|
|
first, then the second, third, and so on.
|
|
If this function is called with more than 1 thread specified, then
|
|
the order of entities called is not guaranteed. Otherwise entities
|
|
will be called in consecutive order by their ID.
|
|
*/
|
|
template <typename SigList, typename FTuple>
|
|
void forMatchingSignaturesPtr(FTuple fTuple,
|
|
void* context = nullptr,
|
|
std::size_t threadCount = 1)
|
|
{
|
|
std::vector<std::vector<std::size_t> > multiMatchingEntities(
|
|
SigList::size);
|
|
BitsetType signatureBitsets[SigList::size];
|
|
|
|
// generate bitsets for each signature
|
|
EC::Meta::forEachWithIndex<SigList>(
|
|
[&signatureBitsets] (auto signature, const auto index) {
|
|
signatureBitsets[index] =
|
|
BitsetType::template generateBitset
|
|
<decltype(signature)>();
|
|
});
|
|
|
|
// find and store entities matching signatures
|
|
if(threadCount <= 1)
|
|
{
|
|
for(std::size_t eid = 0; eid < currentSize; ++eid)
|
|
{
|
|
if(!isAlive(eid))
|
|
{
|
|
continue;
|
|
}
|
|
for(std::size_t i = 0; i < SigList::size; ++i)
|
|
{
|
|
if((signatureBitsets[i]
|
|
& std::get<BitsetType>(entities[eid]))
|
|
== signatureBitsets[i])
|
|
{
|
|
multiMatchingEntities[i].push_back(eid);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
std::vector<std::thread> threads(threadCount);
|
|
std::mutex mutexes[SigList::size];
|
|
std::size_t s = currentSize / threadCount;
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
std::size_t begin = s * i;
|
|
std::size_t end;
|
|
if(i == threadCount - 1)
|
|
{
|
|
end = currentSize;
|
|
}
|
|
else
|
|
{
|
|
end = s * (i + 1);
|
|
}
|
|
threads[i] = std::thread(
|
|
[this, &mutexes, &multiMatchingEntities, &signatureBitsets]
|
|
(std::size_t begin, std::size_t end)
|
|
{
|
|
for(std::size_t j = begin; j < end; ++j)
|
|
{
|
|
if(!isAlive(j))
|
|
{
|
|
continue;
|
|
}
|
|
for(std::size_t k = 0; k < SigList::size; ++k)
|
|
{
|
|
if((signatureBitsets[k]
|
|
& std::get<BitsetType>(entities[j]))
|
|
== signatureBitsets[k])
|
|
{
|
|
std::lock_guard<std::mutex> guard(
|
|
mutexes[k]);
|
|
multiMatchingEntities[k].push_back(j);
|
|
}
|
|
}
|
|
}
|
|
}, begin, end);
|
|
}
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
threads[i].join();
|
|
}
|
|
}
|
|
|
|
// call functions on matching entities
|
|
EC::Meta::forEachDoubleTuple(
|
|
EC::Meta::Morph<SigList, std::tuple<> >{},
|
|
fTuple,
|
|
[this, &multiMatchingEntities, &threadCount, &context]
|
|
(auto sig, auto func, auto index)
|
|
{
|
|
using SignatureComponents =
|
|
typename EC::Meta::Matching<
|
|
decltype(sig), ComponentsList>::type;
|
|
using Helper =
|
|
EC::Meta::Morph<
|
|
SignatureComponents,
|
|
ForMatchingSignatureHelper<> >;
|
|
if(threadCount <= 1)
|
|
{
|
|
for(const auto& id : multiMatchingEntities[index])
|
|
{
|
|
if(isAlive(id))
|
|
{
|
|
Helper::callPtr(id, *this, func, context);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
std::vector<std::thread> threads(threadCount);
|
|
std::size_t s = multiMatchingEntities[index].size()
|
|
/ threadCount;
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
std::size_t begin = s * i;
|
|
std::size_t end;
|
|
if(i == threadCount - 1)
|
|
{
|
|
end = multiMatchingEntities[index].size();
|
|
}
|
|
else
|
|
{
|
|
end = s * (i + 1);
|
|
}
|
|
threads[i] = std::thread(
|
|
[this, &multiMatchingEntities, &index, &func,
|
|
&context]
|
|
(std::size_t begin, std::size_t end)
|
|
{
|
|
for(std::size_t j = begin; j < end;
|
|
++j)
|
|
{
|
|
if(isAlive(multiMatchingEntities[index][j]))
|
|
{
|
|
Helper::callPtr(
|
|
multiMatchingEntities[index][j],
|
|
*this,
|
|
func,
|
|
context);
|
|
}
|
|
}
|
|
}, begin, end);
|
|
}
|
|
for(std::size_t i = 0; i < threadCount; ++i)
|
|
{
|
|
threads[i].join();
|
|
}
|
|
}
|
|
}
|
|
);
|
|
}
|
|
|
|
/*!
|
|
\brief Resets the Manager, removing all entities.
|
|
|
|
Some data may persist but will be overwritten when new entities
|
|
are added. Thus, do not depend on data to persist after a call to
|
|
reset().
|
|
*/
|
|
void reset()
|
|
{
|
|
clearForMatchingFunctions();
|
|
|
|
currentSize = 0;
|
|
currentCapacity = 0;
|
|
deletedSet.clear();
|
|
resize(EC_INIT_ENTITIES_SIZE);
|
|
}
|
|
};
|
|
}
|
|
|
|
#endif
|
|
|