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-rw-r--r--src/core/frontend/input.h97
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diff --git a/src/core/frontend/input.h b/src/core/frontend/input.h
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+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <string>
+#include <tuple>
+#include <unordered_map>
+#include <utility>
+#include "common/logging/log.h"
+#include "common/param_package.h"
+
+namespace Input {
+
+/// An abstract class template for an input device (a button, an analog input, etc.).
+template <typename StatusType>
+class InputDevice {
+public:
+ virtual ~InputDevice() = default;
+ virtual StatusType GetStatus() const {
+ return {};
+ }
+};
+
+/// An abstract class template for a factory that can create input devices.
+template <typename InputDeviceType>
+class Factory {
+public:
+ virtual ~Factory() = default;
+ virtual std::unique_ptr<InputDeviceType> Create(const Common::ParamPackage&) = 0;
+};
+
+namespace Impl {
+
+template <typename InputDeviceType>
+using FactoryListType = std::unordered_map<std::string, std::shared_ptr<Factory<InputDeviceType>>>;
+
+template <typename InputDeviceType>
+struct FactoryList {
+ static FactoryListType<InputDeviceType> list;
+};
+
+template <typename InputDeviceType>
+FactoryListType<InputDeviceType> FactoryList<InputDeviceType>::list;
+
+} // namespace Impl
+
+/**
+ * Registers an input device factory.
+ * @tparam InputDeviceType the type of input devices the factory can create
+ * @param name the name of the factory. Will be used to match the "engine" parameter when creating
+ * a device
+ * @param factory the factory object to register
+ */
+template <typename InputDeviceType>
+void RegisterFactory(const std::string& name, std::shared_ptr<Factory<InputDeviceType>> factory) {
+ auto pair = std::make_pair(name, std::move(factory));
+ if (!Impl::FactoryList<InputDeviceType>::list.insert(std::move(pair)).second) {
+ LOG_ERROR(Input, "Factory %s already registered", name.c_str());
+ }
+}
+
+/**
+ * Unregisters an input device factory.
+ * @tparam InputDeviceType the type of input devices the factory can create
+ * @param name the name of the factory to unregister
+ */
+template <typename InputDeviceType>
+void UnregisterFactory(const std::string& name) {
+ if (Impl::FactoryList<InputDeviceType>::list.erase(name) == 0) {
+ LOG_ERROR(Input, "Factory %s not registered", name.c_str());
+ }
+}
+
+/**
+ * Create an input device from given paramters.
+ * @tparam InputDeviceType the type of input devices to create
+ * @param params a serialized ParamPackage string contains all parameters for creating the device
+ */
+template <typename InputDeviceType>
+std::unique_ptr<InputDeviceType> CreateDevice(const std::string& params) {
+ const Common::ParamPackage package(params);
+ const std::string engine = package.Get("engine", "null");
+ const auto& factory_list = Impl::FactoryList<InputDeviceType>::list;
+ const auto pair = factory_list.find(engine);
+ if (pair == factory_list.end()) {
+ if (engine != "null") {
+ LOG_ERROR(Input, "Unknown engine name: %s", engine.c_str());
+ }
+ return std::make_unique<InputDeviceType>();
+ }
+ return pair->second->Create(package);
+}
+
+} // namespace Input