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136 lines
4.3 KiB
C++
136 lines
4.3 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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#include "common/vector_math.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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/**
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* A button device is an input device that returns bool as status.
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* true for pressed; false for released.
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*/
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using ButtonDevice = InputDevice<bool>;
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/**
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* An analog device is an input device that returns a tuple of x and y coordinates as status. The
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* coordinates are within the unit circle. x+ is defined as right direction, and y+ is defined as up
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* direction
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*/
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using AnalogDevice = InputDevice<std::tuple<float, float>>;
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/**
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* A motion device is an input device that returns a tuple of accelerometer state vector and
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* gyroscope state vector.
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*
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* For both vectors:
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* x+ is the same direction as LEFT on D-pad.
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* y+ is normal to the touch screen, pointing outward.
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* z+ is the same direction as UP on D-pad.
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*
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* For accelerometer state vector
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* Units: g (gravitational acceleration)
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*
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* For gyroscope state vector:
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* Orientation is determined by right-hand rule.
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* Units: deg/sec
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*/
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using MotionDevice = InputDevice<std::tuple<Math::Vec3<float>, Math::Vec3<float>>>;
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/**
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* A touch device is an input device that returns a tuple of two floats and a bool. The floats are
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* x and y coordinates in the range 0.0 - 1.0, and the bool indicates whether it is pressed.
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*/
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using TouchDevice = InputDevice<std::tuple<float, float, bool>>;
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} // namespace Input
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