2 files changed, 491 insertions, 0 deletions
diff --git a/src/input_common/drivers/udp_client.cpp b/src/input_common/drivers/udp_client.cpp
new file mode 100644
index 000000000..6fcc3a01b
--- /dev/null
+++ b/src/input_common/drivers/udp_client.cpp
@@ -0,0 +1,364 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <random>
+#include <boost/asio.hpp>
+
+#include "common/logging/log.h"
+#include "common/param_package.h"
+#include "common/settings.h"
+#include "input_common/drivers/udp_client.h"
+#include "input_common/helpers/udp_protocol.h"
+
+using boost::asio::ip::udp;
+
+namespace InputCommon::CemuhookUDP {
+
+struct SocketCallback {
+    std::function<void(Response::Version)> version;
+    std::function<void(Response::PortInfo)> port_info;
+    std::function<void(Response::PadData)> pad_data;
+};
+
+class Socket {
+public:
+    using clock = std::chrono::system_clock;
+
+    explicit Socket(const std::string& host, u16 port, SocketCallback callback_)
+        : callback(std::move(callback_)), timer(io_service),
+          socket(io_service, udp::endpoint(udp::v4(), 0)), client_id(GenerateRandomClientId()) {
+        boost::system::error_code ec{};
+        auto ipv4 = boost::asio::ip::make_address_v4(host, ec);
+        if (ec.value() != boost::system::errc::success) {
+            LOG_ERROR(Input, "Invalid IPv4 address \"{}\" provided to socket", host);
+            ipv4 = boost::asio::ip::address_v4{};
+        }
+
+        send_endpoint = {udp::endpoint(ipv4, port)};
+    }
+
+    void Stop() {
+        io_service.stop();
+    }
+
+    void Loop() {
+        io_service.run();
+    }
+
+    void StartSend(const clock::time_point& from) {
+        timer.expires_at(from + std::chrono::seconds(3));
+        timer.async_wait([this](const boost::system::error_code& error) { HandleSend(error); });
+    }
+
+    void StartReceive() {
+        socket.async_receive_from(
+            boost::asio::buffer(receive_buffer), receive_endpoint,
+            [this](const boost::system::error_code& error, std::size_t bytes_transferred) {
+                HandleReceive(error, bytes_transferred);
+            });
+    }
+
+private:
+    u32 GenerateRandomClientId() const {
+        std::random_device device;
+        return device();
+    }
+
+    void HandleReceive(const boost::system::error_code&, std::size_t bytes_transferred) {
+        if (auto type = Response::Validate(receive_buffer.data(), bytes_transferred)) {
+            switch (*type) {
+            case Type::Version: {
+                Response::Version version;
+                std::memcpy(&version, &receive_buffer[sizeof(Header)], sizeof(Response::Version));
+                callback.version(std::move(version));
+                break;
+            }
+            case Type::PortInfo: {
+                Response::PortInfo port_info;
+                std::memcpy(&port_info, &receive_buffer[sizeof(Header)],
+                            sizeof(Response::PortInfo));
+                callback.port_info(std::move(port_info));
+                break;
+            }
+            case Type::PadData: {
+                Response::PadData pad_data;
+                std::memcpy(&pad_data, &receive_buffer[sizeof(Header)], sizeof(Response::PadData));
+                callback.pad_data(std::move(pad_data));
+                break;
+            }
+            }
+        }
+        StartReceive();
+    }
+
+    void HandleSend(const boost::system::error_code&) {
+        boost::system::error_code _ignored{};
+        // Send a request for getting port info for the pad
+        const Request::PortInfo port_info{4, {0, 1, 2, 3}};
+        const auto port_message = Request::Create(port_info, client_id);
+        std::memcpy(&send_buffer1, &port_message, PORT_INFO_SIZE);
+        socket.send_to(boost::asio::buffer(send_buffer1), send_endpoint, {}, _ignored);
+
+        // Send a request for getting pad data for the pad
+        const Request::PadData pad_data{
+            Request::PadData::Flags::AllPorts,
+            0,
+            EMPTY_MAC_ADDRESS,
+        };
+        const auto pad_message = Request::Create(pad_data, client_id);
+        std::memcpy(send_buffer2.data(), &pad_message, PAD_DATA_SIZE);
+        socket.send_to(boost::asio::buffer(send_buffer2), send_endpoint, {}, _ignored);
+        StartSend(timer.expiry());
+    }
+
+    SocketCallback callback;
+    boost::asio::io_service io_service;
+    boost::asio::basic_waitable_timer<clock> timer;
+    udp::socket socket;
+
+    const u32 client_id;
+
+    static constexpr std::size_t PORT_INFO_SIZE = sizeof(Message<Request::PortInfo>);
+    static constexpr std::size_t PAD_DATA_SIZE = sizeof(Message<Request::PadData>);
+    std::array<u8, PORT_INFO_SIZE> send_buffer1;
+    std::array<u8, PAD_DATA_SIZE> send_buffer2;
+    udp::endpoint send_endpoint;
+
+    std::array<u8, MAX_PACKET_SIZE> receive_buffer;
+    udp::endpoint receive_endpoint;
+};
+
+static void SocketLoop(Socket* socket) {
+    socket->StartReceive();
+    socket->StartSend(Socket::clock::now());
+    socket->Loop();
+}
+
+UDPClient::UDPClient(const std::string& input_engine_) : InputEngine(input_engine_) {
+    LOG_INFO(Input, "Udp Initialization started");
+    ReloadSockets();
+}
+
+UDPClient::~UDPClient() {
+    Reset();
+}
+
+UDPClient::ClientConnection::ClientConnection() = default;
+
+UDPClient::ClientConnection::~ClientConnection() = default;
+
+void UDPClient::ReloadSockets() {
+    Reset();
+
+    std::stringstream servers_ss(Settings::values.udp_input_servers.GetValue());
+    std::string server_token;
+    std::size_t client = 0;
+    while (std::getline(servers_ss, server_token, ',')) {
+        if (client == MAX_UDP_CLIENTS) {
+            break;
+        }
+        std::stringstream server_ss(server_token);
+        std::string token;
+        std::getline(server_ss, token, ':');
+        std::string udp_input_address = token;
+        std::getline(server_ss, token, ':');
+        char* temp;
+        const u16 udp_input_port = static_cast<u16>(std::strtol(token.c_str(), &temp, 0));
+        if (*temp != '\0') {
+            LOG_ERROR(Input, "Port number is not valid {}", token);
+            continue;
+        }
+
+        const std::size_t client_number = GetClientNumber(udp_input_address, udp_input_port);
+        if (client_number != MAX_UDP_CLIENTS) {
+            LOG_ERROR(Input, "Duplicated UDP servers found");
+            continue;
+        }
+        StartCommunication(client++, udp_input_address, udp_input_port);
+    }
+}
+
+std::size_t UDPClient::GetClientNumber(std::string_view host, u16 port) const {
+    for (std::size_t client = 0; client < clients.size(); client++) {
+        if (clients[client].active == -1) {
+            continue;
+        }
+        if (clients[client].host == host && clients[client].port == port) {
+            return client;
+        }
+    }
+    return MAX_UDP_CLIENTS;
+}
+
+void UDPClient::OnVersion([[maybe_unused]] Response::Version data) {
+    LOG_TRACE(Input, "Version packet received: {}", data.version);
+}
+
+void UDPClient::OnPortInfo([[maybe_unused]] Response::PortInfo data) {
+    LOG_TRACE(Input, "PortInfo packet received: {}", data.model);
+}
+
+void UDPClient::OnPadData(Response::PadData data, std::size_t client) {
+    const std::size_t pad_index = (client * PADS_PER_CLIENT) + data.info.id;
+
+    if (pad_index >= pads.size()) {
+        LOG_ERROR(Input, "Invalid pad id {}", data.info.id);
+        return;
+    }
+
+    LOG_TRACE(Input, "PadData packet received");
+    if (data.packet_counter == pads[pad_index].packet_sequence) {
+        LOG_WARNING(
+            Input,
+            "PadData packet dropped because its stale info. Current count: {} Packet count: {}",
+            pads[pad_index].packet_sequence, data.packet_counter);
+        pads[pad_index].connected = false;
+        return;
+    }
+
+    clients[client].active = 1;
+    pads[pad_index].connected = true;
+    pads[pad_index].packet_sequence = data.packet_counter;
+
+    const auto now = std::chrono::steady_clock::now();
+    const auto time_difference = static_cast<u64>(
+        std::chrono::duration_cast<std::chrono::microseconds>(now - pads[pad_index].last_update)
+            .count());
+    pads[pad_index].last_update = now;
+
+    // Gyroscope values are not it the correct scale from better joy.
+    // Dividing by 312 allows us to make one full turn = 1 turn
+    // This must be a configurable valued called sensitivity
+    const float gyro_scale = 1.0f / 312.0f;
+
+    const BasicMotion motion{
+        .gyro_x = data.gyro.pitch * gyro_scale,
+        .gyro_y = data.gyro.roll * gyro_scale,
+        .gyro_z = -data.gyro.yaw * gyro_scale,
+        .accel_x = data.accel.x,
+        .accel_y = -data.accel.z,
+        .accel_z = data.accel.y,
+        .delta_timestamp = time_difference,
+    };
+    const PadIdentifier identifier = GetPadIdentifier(pad_index);
+    SetMotion(identifier, 0, motion);
+}
+
+void UDPClient::StartCommunication(std::size_t client, const std::string& host, u16 port) {
+    SocketCallback callback{[this](Response::Version version) { OnVersion(version); },
+                            [this](Response::PortInfo info) { OnPortInfo(info); },
+                            [this, client](Response::PadData data) { OnPadData(data, client); }};
+    LOG_INFO(Input, "Starting communication with UDP input server on {}:{}", host, port);
+    clients[client].host = host;
+    clients[client].port = port;
+    clients[client].active = 0;
+    clients[client].socket = std::make_unique<Socket>(host, port, callback);
+    clients[client].thread = std::thread{SocketLoop, clients[client].socket.get()};
+    for (std::size_t index = 0; index < PADS_PER_CLIENT; ++index) {
+        const PadIdentifier identifier = GetPadIdentifier(client * PADS_PER_CLIENT + index);
+        PreSetController(identifier);
+    }
+}
+
+const PadIdentifier UDPClient::GetPadIdentifier(std::size_t pad_index) const {
+    const std::size_t client = pad_index / PADS_PER_CLIENT;
+    return {
+        .guid = Common::UUID{clients[client].host},
+        .port = static_cast<std::size_t>(clients[client].port),
+        .pad = pad_index,
+    };
+}
+
+void UDPClient::Reset() {
+    for (auto& client : clients) {
+        if (client.thread.joinable()) {
+            client.active = -1;
+            client.socket->Stop();
+            client.thread.join();
+        }
+    }
+}
+
+void TestCommunication(const std::string& host, u16 port,
+                       const std::function<void()>& success_callback,
+                       const std::function<void()>& failure_callback) {
+    std::thread([=] {
+        Common::Event success_event;
+        SocketCallback callback{
+            .version = [](Response::Version) {},
+            .port_info = [](Response::PortInfo) {},
+            .pad_data = [&](Response::PadData) { success_event.Set(); },
+        };
+        Socket socket{host, port, std::move(callback)};
+        std::thread worker_thread{SocketLoop, &socket};
+        const bool result =
+            success_event.WaitUntil(std::chrono::steady_clock::now() + std::chrono::seconds(10));
+        socket.Stop();
+        worker_thread.join();
+        if (result) {
+            success_callback();
+        } else {
+            failure_callback();
+        }
+    }).detach();
+}
+
+CalibrationConfigurationJob::CalibrationConfigurationJob(
+    const std::string& host, u16 port, std::function<void(Status)> status_callback,
+    std::function<void(u16, u16, u16, u16)> data_callback) {
+
+    std::thread([=, this] {
+        Status current_status{Status::Initialized};
+        SocketCallback callback{
+            [](Response::Version) {}, [](Response::PortInfo) {},
+            [&](Response::PadData data) {
+                static constexpr u16 CALIBRATION_THRESHOLD = 100;
+                static constexpr u16 MAX_VALUE = UINT16_MAX;
+
+                if (current_status == Status::Initialized) {
+                    // Receiving data means the communication is ready now
+                    current_status = Status::Ready;
+                    status_callback(current_status);
+                }
+                const auto& touchpad_0 = data.touch[0];
+                if (touchpad_0.is_active == 0) {
+                    return;
+                }
+                LOG_DEBUG(Input, "Current touch: {} {}", touchpad_0.x, touchpad_0.y);
+                const u16 min_x = std::min(MAX_VALUE, static_cast<u16>(touchpad_0.x));
+                const u16 min_y = std::min(MAX_VALUE, static_cast<u16>(touchpad_0.y));
+                if (current_status == Status::Ready) {
+                    // First touch - min data (min_x/min_y)
+                    current_status = Status::Stage1Completed;
+                    status_callback(current_status);
+                }
+                if (touchpad_0.x - min_x > CALIBRATION_THRESHOLD &&
+                    touchpad_0.y - min_y > CALIBRATION_THRESHOLD) {
+                    // Set the current position as max value and finishes configuration
+                    const u16 max_x = touchpad_0.x;
+                    const u16 max_y = touchpad_0.y;
+                    current_status = Status::Completed;
+                    data_callback(min_x, min_y, max_x, max_y);
+                    status_callback(current_status);
+
+                    complete_event.Set();
+                }
+            }};
+        Socket socket{host, port, std::move(callback)};
+        std::thread worker_thread{SocketLoop, &socket};
+        complete_event.Wait();
+        socket.Stop();
+        worker_thread.join();
+    }).detach();
+}
+
+CalibrationConfigurationJob::~CalibrationConfigurationJob() {
+    Stop();
+}
+
+void CalibrationConfigurationJob::Stop() {
+    complete_event.Set();
+}
+
+} // namespace InputCommon::CemuhookUDP
diff --git a/src/input_common/drivers/udp_client.h b/src/input_common/drivers/udp_client.h
new file mode 100644
index 000000000..58b2e921d
--- /dev/null
+++ b/src/input_common/drivers/udp_client.h
@@ -0,0 +1,127 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included
+
+#pragma once
+
+#include <optional>
+
+#include "common/common_types.h"
+#include "common/thread.h"
+#include "input_common/input_engine.h"
+
+namespace InputCommon::CemuhookUDP {
+
+class Socket;
+
+namespace Response {
+struct PadData;
+struct PortInfo;
+struct TouchPad;
+struct Version;
+} // namespace Response
+
+enum class PadTouch {
+    Click,
+    Undefined,
+};
+
+struct UDPPadStatus {
+    std::string host{"127.0.0.1"};
+    u16 port{26760};
+    std::size_t pad_index{};
+};
+
+struct DeviceStatus {
+    std::mutex update_mutex;
+
+    // calibration data for scaling the device's touch area to 3ds
+    struct CalibrationData {
+        u16 min_x{};
+        u16 min_y{};
+        u16 max_x{};
+        u16 max_y{};
+    };
+    std::optional<CalibrationData> touch_calibration;
+};
+
+/**
+ * A button device factory representing a keyboard. It receives keyboard events and forward them
+ * to all button devices it created.
+ */
+class UDPClient final : public InputCommon::InputEngine {
+public:
+    explicit UDPClient(const std::string& input_engine_);
+    ~UDPClient();
+
+    void ReloadSockets();
+
+private:
+    struct PadData {
+        std::size_t pad_index{};
+        bool connected{};
+        DeviceStatus status;
+        u64 packet_sequence{};
+
+        std::chrono::time_point<std::chrono::steady_clock> last_update;
+    };
+
+    struct ClientConnection {
+        ClientConnection();
+        ~ClientConnection();
+        std::string host{"127.0.0.1"};
+        u16 port{26760};
+        s8 active{-1};
+        std::unique_ptr<Socket> socket;
+        std::thread thread;
+    };
+
+    // For shutting down, clear all data, join all threads, release usb
+    void Reset();
+
+    // Translates configuration to client number
+    std::size_t GetClientNumber(std::string_view host, u16 port) const;
+
+    void OnVersion(Response::Version);
+    void OnPortInfo(Response::PortInfo);
+    void OnPadData(Response::PadData, std::size_t client);
+    void StartCommunication(std::size_t client, const std::string& host, u16 port);
+    const PadIdentifier GetPadIdentifier(std::size_t pad_index) const;
+
+    // Allocate clients for 8 udp servers
+    static constexpr std::size_t MAX_UDP_CLIENTS = 8;
+    static constexpr std::size_t PADS_PER_CLIENT = 4;
+    std::array<PadData, MAX_UDP_CLIENTS * PADS_PER_CLIENT> pads{};
+    std::array<ClientConnection, MAX_UDP_CLIENTS> clients{};
+};
+
+/// An async job allowing configuration of the touchpad calibration.
+class CalibrationConfigurationJob {
+public:
+    enum class Status {
+        Initialized,
+        Ready,
+        Stage1Completed,
+        Completed,
+    };
+    /**
+     * Constructs and starts the job with the specified parameter.
+     *
+     * @param status_callback Callback for job status updates
+     * @param data_callback Called when calibration data is ready
+     */
+    explicit CalibrationConfigurationJob(const std::string& host, u16 port,
+                                         std::function<void(Status)> status_callback,
+                                         std::function<void(u16, u16, u16, u16)> data_callback);
+    ~CalibrationConfigurationJob();
+    void Stop();
+
+private:
+    Common::Event complete_event;
+};
+
+void TestCommunication(const std::string& host, u16 port,
+                       const std::function<void()>& success_callback,
+                       const std::function<void()>& failure_callback);
+
+} // namespace InputCommon::CemuhookUDP