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98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
// Copyright 2017 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <memory>
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#include <string>
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#include <tuple>
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#include <unordered_map>
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#include <utility>
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#include "common/logging/log.h"
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#include "common/param_package.h"
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namespace Input {
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/// An abstract class template for an input device (a button, an analog input, etc.).
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template <typename StatusType>
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class InputDevice {
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public:
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virtual ~InputDevice() = default;
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virtual StatusType GetStatus() const {
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return {};
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}
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};
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/// An abstract class template for a factory that can create input devices.
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template <typename InputDeviceType>
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class Factory {
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public:
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virtual ~Factory() = default;
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virtual std::unique_ptr<InputDeviceType> Create(const Common::ParamPackage&) = 0;
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};
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namespace Impl {
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template <typename InputDeviceType>
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using FactoryListType = std::unordered_map<std::string, std::shared_ptr<Factory<InputDeviceType>>>;
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template <typename InputDeviceType>
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struct FactoryList {
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static FactoryListType<InputDeviceType> list;
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};
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template <typename InputDeviceType>
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FactoryListType<InputDeviceType> FactoryList<InputDeviceType>::list;
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} // namespace Impl
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/**
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* Registers an input device factory.
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* @tparam InputDeviceType the type of input devices the factory can create
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* @param name the name of the factory. Will be used to match the "engine" parameter when creating
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* a device
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* @param factory the factory object to register
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*/
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template <typename InputDeviceType>
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void RegisterFactory(const std::string& name, std::shared_ptr<Factory<InputDeviceType>> factory) {
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auto pair = std::make_pair(name, std::move(factory));
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if (!Impl::FactoryList<InputDeviceType>::list.insert(std::move(pair)).second) {
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LOG_ERROR(Input, "Factory %s already registered", name.c_str());
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}
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}
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/**
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* Unregisters an input device factory.
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* @tparam InputDeviceType the type of input devices the factory can create
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* @param name the name of the factory to unregister
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*/
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template <typename InputDeviceType>
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void UnregisterFactory(const std::string& name) {
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if (Impl::FactoryList<InputDeviceType>::list.erase(name) == 0) {
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LOG_ERROR(Input, "Factory %s not registered", name.c_str());
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}
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}
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/**
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* Create an input device from given paramters.
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* @tparam InputDeviceType the type of input devices to create
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* @param params a serialized ParamPackage string contains all parameters for creating the device
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*/
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template <typename InputDeviceType>
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std::unique_ptr<InputDeviceType> CreateDevice(const std::string& params) {
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const Common::ParamPackage package(params);
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const std::string engine = package.Get("engine", "null");
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const auto& factory_list = Impl::FactoryList<InputDeviceType>::list;
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const auto pair = factory_list.find(engine);
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if (pair == factory_list.end()) {
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if (engine != "null") {
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LOG_ERROR(Input, "Unknown engine name: %s", engine.c_str());
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}
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return std::make_unique<InputDeviceType>();
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}
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return pair->second->Create(package);
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}
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} // namespace Input
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