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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);
}
/**
* A button device is an input device that returns bool as status.
* true for pressed; false for released.
*/
using ButtonDevice = InputDevice<bool>;
/**
* An analog device is an input device that returns a tuple of x and y coordinates as status. The
* coordinates are within the unit circle. x+ is defined as right direction, and y+ is defined as up
* direction
*/
using AnalogDevice = InputDevice<std::tuple<float, float>>;
} // namespace Input
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