early-access version 1255

src/input_common/CMakeLists.txt

@@ -0,0 +1,80 @@
+add_library(input_common STATIC
+    analog_from_button.cpp
+    analog_from_button.h
+    keyboard.cpp
+    keyboard.h
+    main.cpp
+    main.h
+    motion_from_button.cpp
+    motion_from_button.h
+    motion_input.cpp
+    motion_input.h
+    settings.cpp
+    settings.h
+    touch_from_button.cpp
+    touch_from_button.h
+    gcadapter/gc_adapter.cpp
+    gcadapter/gc_adapter.h
+    gcadapter/gc_poller.cpp
+    gcadapter/gc_poller.h
+    mouse/mouse_input.cpp
+    mouse/mouse_input.h
+    mouse/mouse_poller.cpp
+    mouse/mouse_poller.h
+    sdl/sdl.cpp
+    sdl/sdl.h
+    udp/client.cpp
+    udp/client.h
+    udp/protocol.cpp
+    udp/protocol.h
+    udp/udp.cpp
+    udp/udp.h
+)
+
+if (MSVC)
+    target_compile_options(input_common PRIVATE
+        /W4
+        /WX
+
+        # 'expression' : signed/unsigned mismatch
+        /we4018
+        # 'argument' : conversion from 'type1' to 'type2', possible loss of data (floating-point)
+        /we4244
+        # 'conversion' : conversion from 'type1' to 'type2', signed/unsigned mismatch
+        /we4245
+        # 'operator': conversion from 'type1:field_bits' to 'type2:field_bits', possible loss of data
+        /we4254
+        # 'var' : conversion from 'size_t' to 'type', possible loss of data
+        /we4267
+        # 'context' : truncation from 'type1' to 'type2'
+        /we4305
+    )
+else()
+    target_compile_options(input_common PRIVATE
+        -Werror
+        -Werror=conversion
+        -Werror=ignored-qualifiers
+        -Werror=implicit-fallthrough
+        -Werror=reorder
+        -Werror=shadow
+        -Werror=sign-compare
+        $<$<CXX_COMPILER_ID:GNU>:-Werror=unused-but-set-parameter>
+        $<$<CXX_COMPILER_ID:GNU>:-Werror=unused-but-set-variable>
+        -Werror=unused-variable
+    )
+endif()
+
+if(SDL2_FOUND)
+    target_sources(input_common PRIVATE
+        sdl/sdl_impl.cpp
+        sdl/sdl_impl.h
+    )
+    target_link_libraries(input_common PRIVATE SDL2)
+    target_compile_definitions(input_common PRIVATE HAVE_SDL2)
+endif()
+
+target_include_directories(input_common SYSTEM PRIVATE ${LIBUSB_INCLUDE_DIR})
+target_link_libraries(input_common PRIVATE ${LIBUSB_LIBRARIES})
+
+create_target_directory_groups(input_common)
+target_link_libraries(input_common PUBLIC core PRIVATE common Boost::boost)

src/input_common/analog_from_button.cpp

@@ -0,0 +1,180 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <chrono>
+#include <cmath>
+#include <thread>
+#include "common/math_util.h"
+#include "core/settings.h"
+#include "input_common/analog_from_button.h"
+
+namespace InputCommon {
+
+class Analog final : public Input::AnalogDevice {
+public:
+    using Button = std::unique_ptr<Input::ButtonDevice>;
+
+    Analog(Button up_, Button down_, Button left_, Button right_, Button modifier_,
+           float modifier_scale_, float modifier_angle_)
+        : up(std::move(up_)), down(std::move(down_)), left(std::move(left_)),
+          right(std::move(right_)), modifier(std::move(modifier_)), modifier_scale(modifier_scale_),
+          modifier_angle(modifier_angle_) {
+        update_thread = std::thread(&Analog::UpdateStatus, this);
+    }
+
+    ~Analog() override {
+        update_thread_running = false;
+        if (update_thread.joinable()) {
+            update_thread.join();
+        }
+    }
+
+    void MoveToDirection(bool enable, float to_angle) {
+        if (!enable) {
+            return;
+        }
+        constexpr float TAU = Common::PI * 2.0f;
+        // Use wider angle to ease the transition.
+        constexpr float aperture = TAU * 0.15f;
+        const float top_limit = to_angle + aperture;
+        const float bottom_limit = to_angle - aperture;
+
+        if ((angle > to_angle && angle <= top_limit) ||
+            (angle + TAU > to_angle && angle + TAU <= top_limit)) {
+            angle -= modifier_angle;
+            if (angle < 0) {
+                angle += TAU;
+            }
+        } else if ((angle >= bottom_limit && angle < to_angle) ||
+                   (angle - TAU >= bottom_limit && angle - TAU < to_angle)) {
+            angle += modifier_angle;
+            if (angle >= TAU) {
+                angle -= TAU;
+            }
+        } else {
+            angle = to_angle;
+        }
+    }
+
+    void UpdateStatus() {
+        while (update_thread_running) {
+            const float coef = modifier->GetStatus() ? modifier_scale : 1.0f;
+
+            bool r = right->GetStatus();
+            bool l = left->GetStatus();
+            bool u = up->GetStatus();
+            bool d = down->GetStatus();
+
+            // Eliminate contradictory movements
+            if (r && l) {
+                r = false;
+                l = false;
+            }
+            if (u && d) {
+                u = false;
+                d = false;
+            }
+
+            // Move to the right
+            MoveToDirection(r && !u && !d, 0.0f);
+
+            // Move to the upper right
+            MoveToDirection(r && u && !d, Common::PI * 0.25f);
+
+            // Move up
+            MoveToDirection(u && !l && !r, Common::PI * 0.5f);
+
+            // Move to the upper left
+            MoveToDirection(l && u && !d, Common::PI * 0.75f);
+
+            // Move to the left
+            MoveToDirection(l && !u && !d, Common::PI);
+
+            // Move to the bottom left
+            MoveToDirection(l && !u && d, Common::PI * 1.25f);
+
+            // Move down
+            MoveToDirection(d && !l && !r, Common::PI * 1.5f);
+
+            // Move to the bottom right
+            MoveToDirection(r && !u && d, Common::PI * 1.75f);
+
+            // Move if a key is pressed
+            if (r || l || u || d) {
+                amplitude = coef;
+            } else {
+                amplitude = 0;
+            }
+
+            // Delay the update rate to 100hz
+            std::this_thread::sleep_for(std::chrono::milliseconds(10));
+        }
+    }
+
+    std::tuple<float, float> GetStatus() const override {
+        if (Settings::values.emulate_analog_keyboard) {
+            return std::make_tuple(std::cos(angle) * amplitude, std::sin(angle) * amplitude);
+        }
+        constexpr float SQRT_HALF = 0.707106781f;
+        int x = 0, y = 0;
+        if (right->GetStatus()) {
+            ++x;
+        }
+        if (left->GetStatus()) {
+            --x;
+        }
+        if (up->GetStatus()) {
+            ++y;
+        }
+        if (down->GetStatus()) {
+            --y;
+        }
+        const float coef = modifier->GetStatus() ? modifier_scale : 1.0f;
+        return std::make_tuple(static_cast<float>(x) * coef * (y == 0 ? 1.0f : SQRT_HALF),
+                               static_cast<float>(y) * coef * (x == 0 ? 1.0f : SQRT_HALF));
+    }
+
+    bool GetAnalogDirectionStatus(Input::AnalogDirection direction) const override {
+        switch (direction) {
+        case Input::AnalogDirection::RIGHT:
+            return right->GetStatus();
+        case Input::AnalogDirection::LEFT:
+            return left->GetStatus();
+        case Input::AnalogDirection::UP:
+            return up->GetStatus();
+        case Input::AnalogDirection::DOWN:
+            return down->GetStatus();
+        }
+        return false;
+    }
+
+private:
+    Button up;
+    Button down;
+    Button left;
+    Button right;
+    Button modifier;
+    float modifier_scale;
+    float modifier_angle;
+    float angle{};
+    float amplitude{};
+    std::thread update_thread;
+    bool update_thread_running{true};
+};
+
+std::unique_ptr<Input::AnalogDevice> AnalogFromButton::Create(const Common::ParamPackage& params) {
+    const std::string null_engine = Common::ParamPackage{{"engine", "null"}}.Serialize();
+    auto up = Input::CreateDevice<Input::ButtonDevice>(params.Get("up", null_engine));
+    auto down = Input::CreateDevice<Input::ButtonDevice>(params.Get("down", null_engine));
+    auto left = Input::CreateDevice<Input::ButtonDevice>(params.Get("left", null_engine));
+    auto right = Input::CreateDevice<Input::ButtonDevice>(params.Get("right", null_engine));
+    auto modifier = Input::CreateDevice<Input::ButtonDevice>(params.Get("modifier", null_engine));
+    auto modifier_scale = params.Get("modifier_scale", 0.5f);
+    auto modifier_angle = params.Get("modifier_angle", 0.035f);
+    return std::make_unique<Analog>(std::move(up), std::move(down), std::move(left),
+                                    std::move(right), std::move(modifier), modifier_scale,
+                                    modifier_angle);
+}
+
+} // namespace InputCommon

src/input_common/analog_from_button.h

@@ -0,0 +1,31 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "core/frontend/input.h"
+
+namespace InputCommon {
+
+/**
+ * An analog device factory that takes direction button devices and combines them into a analog
+ * device.
+ */
+class AnalogFromButton final : public Input::Factory<Input::AnalogDevice> {
+public:
+    /**
+     * Creates an analog device from direction button devices
+     * @param params contains parameters for creating the device:
+     *     - "up": a serialized ParamPackage for creating a button device for up direction
+     *     - "down": a serialized ParamPackage for creating a button device for down direction
+     *     - "left": a serialized ParamPackage for creating a button device for left direction
+     *     - "right": a serialized ParamPackage  for creating a button device for right direction
+     *     - "modifier": a serialized ParamPackage for creating a button device as the modifier
+     *     - "modifier_scale": a float for the multiplier the modifier gives to the position
+     */
+    std::unique_ptr<Input::AnalogDevice> Create(const Common::ParamPackage& params) override;
+};
+
+} // namespace InputCommon

src/input_common/gcadapter/gc_adapter.cpp

@@ -0,0 +1,509 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <chrono>
+#include <thread>
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 4200) // nonstandard extension used : zero-sized array in struct/union
+#endif
+#include <libusb.h>
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
+#include "common/logging/log.h"
+#include "common/param_package.h"
+#include "input_common/gcadapter/gc_adapter.h"
+#include "input_common/settings.h"
+
+namespace GCAdapter {
+
+Adapter::Adapter() {
+    if (usb_adapter_handle != nullptr) {
+        return;
+    }
+    LOG_INFO(Input, "GC Adapter Initialization started");
+
+    const int init_res = libusb_init(&libusb_ctx);
+    if (init_res == LIBUSB_SUCCESS) {
+        adapter_scan_thread = std::thread(&Adapter::AdapterScanThread, this);
+    } else {
+        LOG_ERROR(Input, "libusb could not be initialized. failed with error = {}", init_res);
+    }
+}
+
+Adapter::~Adapter() {
+    Reset();
+}
+
+void Adapter::AdapterInputThread() {
+    LOG_DEBUG(Input, "GC Adapter input thread started");
+    s32 payload_size{};
+    AdapterPayload adapter_payload{};
+
+    if (adapter_scan_thread.joinable()) {
+        adapter_scan_thread.join();
+    }
+
+    while (adapter_input_thread_running) {
+        libusb_interrupt_transfer(usb_adapter_handle, input_endpoint, adapter_payload.data(),
+                                  static_cast<s32>(adapter_payload.size()), &payload_size, 16);
+        if (IsPayloadCorrect(adapter_payload, payload_size)) {
+            UpdateControllers(adapter_payload);
+            UpdateVibrations();
+        }
+        std::this_thread::yield();
+    }
+
+    if (restart_scan_thread) {
+        adapter_scan_thread = std::thread(&Adapter::AdapterScanThread, this);
+        restart_scan_thread = false;
+    }
+}
+
+bool Adapter::IsPayloadCorrect(const AdapterPayload& adapter_payload, s32 payload_size) {
+    if (payload_size != static_cast<s32>(adapter_payload.size()) ||
+        adapter_payload[0] != LIBUSB_DT_HID) {
+        LOG_DEBUG(Input, "Error reading payload (size: {}, type: {:02x})", payload_size,
+                  adapter_payload[0]);
+        if (input_error_counter++ > 20) {
+            LOG_ERROR(Input, "GC adapter timeout, Is the adapter connected?");
+            adapter_input_thread_running = false;
+            restart_scan_thread = true;
+        }
+        return false;
+    }
+
+    input_error_counter = 0;
+    return true;
+}
+
+void Adapter::UpdateControllers(const AdapterPayload& adapter_payload) {
+    for (std::size_t port = 0; port < pads.size(); ++port) {
+        const std::size_t offset = 1 + (9 * port);
+        const auto type = static_cast<ControllerTypes>(adapter_payload[offset] >> 4);
+        UpdatePadType(port, type);
+        if (DeviceConnected(port)) {
+            const u8 b1 = adapter_payload[offset + 1];
+            const u8 b2 = adapter_payload[offset + 2];
+            UpdateStateButtons(port, b1, b2);
+            UpdateStateAxes(port, adapter_payload);
+            if (configuring) {
+                UpdateYuzuSettings(port);
+            }
+        }
+    }
+}
+
+void Adapter::UpdatePadType(std::size_t port, ControllerTypes pad_type) {
+    if (pads[port].type == pad_type) {
+        return;
+    }
+    // Device changed reset device and set new type
+    ResetDevice(port);
+    pads[port].type = pad_type;
+}
+
+void Adapter::UpdateStateButtons(std::size_t port, u8 b1, u8 b2) {
+    if (port >= pads.size()) {
+        return;
+    }
+
+    static constexpr std::array<PadButton, 8> b1_buttons{
+        PadButton::ButtonA,    PadButton::ButtonB,     PadButton::ButtonX,    PadButton::ButtonY,
+        PadButton::ButtonLeft, PadButton::ButtonRight, PadButton::ButtonDown, PadButton::ButtonUp,
+    };
+
+    static constexpr std::array<PadButton, 4> b2_buttons{
+        PadButton::ButtonStart,
+        PadButton::TriggerZ,
+        PadButton::TriggerR,
+        PadButton::TriggerL,
+    };
+    pads[port].buttons = 0;
+    for (std::size_t i = 0; i < b1_buttons.size(); ++i) {
+        if ((b1 & (1U << i)) != 0) {
+            pads[port].buttons =
+                static_cast<u16>(pads[port].buttons | static_cast<u16>(b1_buttons[i]));
+            pads[port].last_button = b1_buttons[i];
+        }
+    }
+
+    for (std::size_t j = 0; j < b2_buttons.size(); ++j) {
+        if ((b2 & (1U << j)) != 0) {
+            pads[port].buttons =
+                static_cast<u16>(pads[port].buttons | static_cast<u16>(b2_buttons[j]));
+            pads[port].last_button = b2_buttons[j];
+        }
+    }
+}
+
+void Adapter::UpdateStateAxes(std::size_t port, const AdapterPayload& adapter_payload) {
+    if (port >= pads.size()) {
+        return;
+    }
+
+    const std::size_t offset = 1 + (9 * port);
+    static constexpr std::array<PadAxes, 6> axes{
+        PadAxes::StickX,    PadAxes::StickY,      PadAxes::SubstickX,
+        PadAxes::SubstickY, PadAxes::TriggerLeft, PadAxes::TriggerRight,
+    };
+
+    for (const PadAxes axis : axes) {
+        const auto index = static_cast<std::size_t>(axis);
+        const u8 axis_value = adapter_payload[offset + 3 + index];
+        if (pads[port].axis_origin[index] == 255) {
+            pads[port].axis_origin[index] = axis_value;
+        }
+        pads[port].axis_values[index] =
+            static_cast<s16>(axis_value - pads[port].axis_origin[index]);
+    }
+}
+
+void Adapter::UpdateYuzuSettings(std::size_t port) {
+    if (port >= pads.size()) {
+        return;
+    }
+
+    constexpr u8 axis_threshold = 50;
+    GCPadStatus pad_status = {.port = port};
+
+    if (pads[port].buttons != 0) {
+        pad_status.button = pads[port].last_button;
+        pad_queue.Push(pad_status);
+    }
+
+    // Accounting for a threshold here to ensure an intentional press
+    for (std::size_t i = 0; i < pads[port].axis_values.size(); ++i) {
+        const s16 value = pads[port].axis_values[i];
+
+        if (value > axis_threshold || value < -axis_threshold) {
+            pad_status.axis = static_cast<PadAxes>(i);
+            pad_status.axis_value = value;
+            pad_status.axis_threshold = axis_threshold;
+            pad_queue.Push(pad_status);
+        }
+    }
+}
+
+void Adapter::UpdateVibrations() {
+    // Use 8 states to keep the switching between on/off fast enough for
+    // a human to not notice the difference between switching from on/off
+    // More states = more rumble strengths = slower update time
+    constexpr u8 vibration_states = 8;
+
+    vibration_counter = (vibration_counter + 1) % vibration_states;
+
+    for (GCController& pad : pads) {
+        const bool vibrate = pad.rumble_amplitude > vibration_counter;
+        vibration_changed |= vibrate != pad.enable_vibration;
+        pad.enable_vibration = vibrate;
+    }
+    SendVibrations();
+}
+
+void Adapter::SendVibrations() {
+    if (!rumble_enabled || !vibration_changed) {
+        return;
+    }
+    s32 size{};
+    constexpr u8 rumble_command = 0x11;
+    const u8 p1 = pads[0].enable_vibration;
+    const u8 p2 = pads[1].enable_vibration;
+    const u8 p3 = pads[2].enable_vibration;
+    const u8 p4 = pads[3].enable_vibration;
+    std::array<u8, 5> payload = {rumble_command, p1, p2, p3, p4};
+    const int err = libusb_interrupt_transfer(usb_adapter_handle, output_endpoint, payload.data(),
+                                              static_cast<s32>(payload.size()), &size, 16);
+    if (err) {
+        LOG_DEBUG(Input, "Adapter libusb write failed: {}", libusb_error_name(err));
+        if (output_error_counter++ > 5) {
+            LOG_ERROR(Input, "GC adapter output timeout, Rumble disabled");
+            rumble_enabled = false;
+        }
+        return;
+    }
+    output_error_counter = 0;
+    vibration_changed = false;
+}
+
+bool Adapter::RumblePlay(std::size_t port, u8 amplitude) {
+    pads[port].rumble_amplitude = amplitude;
+
+    return rumble_enabled;
+}
+
+void Adapter::AdapterScanThread() {
+    adapter_scan_thread_running = true;
+    adapter_input_thread_running = false;
+    if (adapter_input_thread.joinable()) {
+        adapter_input_thread.join();
+    }
+    ClearLibusbHandle();
+    ResetDevices();
+    while (adapter_scan_thread_running && !adapter_input_thread_running) {
+        Setup();
+        std::this_thread::sleep_for(std::chrono::seconds(1));
+    }
+}
+
+void Adapter::Setup() {
+    usb_adapter_handle = libusb_open_device_with_vid_pid(libusb_ctx, 0x057e, 0x0337);
+
+    if (usb_adapter_handle == NULL) {
+        return;
+    }
+    if (!CheckDeviceAccess()) {
+        ClearLibusbHandle();
+        return;
+    }
+
+    libusb_device* device = libusb_get_device(usb_adapter_handle);
+
+    LOG_INFO(Input, "GC adapter is now connected");
+    // GC Adapter found and accessible, registering it
+    if (GetGCEndpoint(device)) {
+        adapter_scan_thread_running = false;
+        adapter_input_thread_running = true;
+        rumble_enabled = true;
+        input_error_counter = 0;
+        output_error_counter = 0;
+        adapter_input_thread = std::thread(&Adapter::AdapterInputThread, this);
+    }
+}
+
+bool Adapter::CheckDeviceAccess() {
+    // This fixes payload problems from offbrand GCAdapters
+    const s32 control_transfer_error =
+        libusb_control_transfer(usb_adapter_handle, 0x21, 11, 0x0001, 0, nullptr, 0, 1000);
+    if (control_transfer_error < 0) {
+        LOG_ERROR(Input, "libusb_control_transfer failed with error= {}", control_transfer_error);
+    }
+
+    s32 kernel_driver_error = libusb_kernel_driver_active(usb_adapter_handle, 0);
+    if (kernel_driver_error == 1) {
+        kernel_driver_error = libusb_detach_kernel_driver(usb_adapter_handle, 0);
+        if (kernel_driver_error != 0 && kernel_driver_error != LIBUSB_ERROR_NOT_SUPPORTED) {
+            LOG_ERROR(Input, "libusb_detach_kernel_driver failed with error = {}",
+                      kernel_driver_error);
+        }
+    }
+
+    if (kernel_driver_error && kernel_driver_error != LIBUSB_ERROR_NOT_SUPPORTED) {
+        libusb_close(usb_adapter_handle);
+        usb_adapter_handle = nullptr;
+        return false;
+    }
+
+    const int interface_claim_error = libusb_claim_interface(usb_adapter_handle, 0);
+    if (interface_claim_error) {
+        LOG_ERROR(Input, "libusb_claim_interface failed with error = {}", interface_claim_error);
+        libusb_close(usb_adapter_handle);
+        usb_adapter_handle = nullptr;
+        return false;
+    }
+
+    return true;
+}
+
+bool Adapter::GetGCEndpoint(libusb_device* device) {
+    libusb_config_descriptor* config = nullptr;
+    const int config_descriptor_return = libusb_get_config_descriptor(device, 0, &config);
+    if (config_descriptor_return != LIBUSB_SUCCESS) {
+        LOG_ERROR(Input, "libusb_get_config_descriptor failed with error = {}",
+                  config_descriptor_return);
+        return false;
+    }
+
+    for (u8 ic = 0; ic < config->bNumInterfaces; ic++) {
+        const libusb_interface* interfaceContainer = &config->interface[ic];
+        for (int i = 0; i < interfaceContainer->num_altsetting; i++) {
+            const libusb_interface_descriptor* interface = &interfaceContainer->altsetting[i];
+            for (u8 e = 0; e < interface->bNumEndpoints; e++) {
+                const libusb_endpoint_descriptor* endpoint = &interface->endpoint[e];
+                if ((endpoint->bEndpointAddress & LIBUSB_ENDPOINT_IN) != 0) {
+                    input_endpoint = endpoint->bEndpointAddress;
+                } else {
+                    output_endpoint = endpoint->bEndpointAddress;
+                }
+            }
+        }
+    }
+    // This transfer seems to be responsible for clearing the state of the adapter
+    // Used to clear the "busy" state of when the device is unexpectedly unplugged
+    unsigned char clear_payload = 0x13;
+    libusb_interrupt_transfer(usb_adapter_handle, output_endpoint, &clear_payload,
+                              sizeof(clear_payload), nullptr, 16);
+    return true;
+}
+
+void Adapter::JoinThreads() {
+    restart_scan_thread = false;
+    adapter_input_thread_running = false;
+    adapter_scan_thread_running = false;
+
+    if (adapter_scan_thread.joinable()) {
+        adapter_scan_thread.join();
+    }
+
+    if (adapter_input_thread.joinable()) {
+        adapter_input_thread.join();
+    }
+}
+
+void Adapter::ClearLibusbHandle() {
+    if (usb_adapter_handle) {
+        libusb_release_interface(usb_adapter_handle, 1);
+        libusb_close(usb_adapter_handle);
+        usb_adapter_handle = nullptr;
+    }
+}
+
+void Adapter::ResetDevices() {
+    for (std::size_t i = 0; i < pads.size(); ++i) {
+        ResetDevice(i);
+    }
+}
+
+void Adapter::ResetDevice(std::size_t port) {
+    pads[port].type = ControllerTypes::None;
+    pads[port].enable_vibration = false;
+    pads[port].rumble_amplitude = 0;
+    pads[port].buttons = 0;
+    pads[port].last_button = PadButton::Undefined;
+    pads[port].axis_values.fill(0);
+    pads[port].axis_origin.fill(255);
+}
+
+void Adapter::Reset() {
+    JoinThreads();
+    ClearLibusbHandle();
+    ResetDevices();
+
+    if (libusb_ctx) {
+        libusb_exit(libusb_ctx);
+    }
+}
+
+std::vector<Common::ParamPackage> Adapter::GetInputDevices() const {
+    std::vector<Common::ParamPackage> devices;
+    for (std::size_t port = 0; port < pads.size(); ++port) {
+        if (!DeviceConnected(port)) {
+            continue;
+        }
+        std::string name = fmt::format("Gamecube Controller {}", port + 1);
+        devices.emplace_back(Common::ParamPackage{
+            {"class", "gcpad"},
+            {"display", std::move(name)},
+            {"port", std::to_string(port)},
+        });
+    }
+    return devices;
+}
+
+InputCommon::ButtonMapping Adapter::GetButtonMappingForDevice(
+    const Common::ParamPackage& params) const {
+    // This list is missing ZL/ZR since those are not considered buttons.
+    // We will add those afterwards
+    // This list also excludes any button that can't be really mapped
+    static constexpr std::array<std::pair<Settings::NativeButton::Values, PadButton>, 12>
+        switch_to_gcadapter_button = {
+            std::pair{Settings::NativeButton::A, PadButton::ButtonA},
+            {Settings::NativeButton::B, PadButton::ButtonB},
+            {Settings::NativeButton::X, PadButton::ButtonX},
+            {Settings::NativeButton::Y, PadButton::ButtonY},
+            {Settings::NativeButton::Plus, PadButton::ButtonStart},
+            {Settings::NativeButton::DLeft, PadButton::ButtonLeft},
+            {Settings::NativeButton::DUp, PadButton::ButtonUp},
+            {Settings::NativeButton::DRight, PadButton::ButtonRight},
+            {Settings::NativeButton::DDown, PadButton::ButtonDown},
+            {Settings::NativeButton::SL, PadButton::TriggerL},
+            {Settings::NativeButton::SR, PadButton::TriggerR},
+            {Settings::NativeButton::R, PadButton::TriggerZ},
+        };
+    if (!params.Has("port")) {
+        return {};
+    }
+
+    InputCommon::ButtonMapping mapping{};
+    for (const auto& [switch_button, gcadapter_button] : switch_to_gcadapter_button) {
+        Common::ParamPackage button_params({{"engine", "gcpad"}});
+        button_params.Set("port", params.Get("port", 0));
+        button_params.Set("button", static_cast<int>(gcadapter_button));
+        mapping.insert_or_assign(switch_button, std::move(button_params));
+    }
+
+    // Add the missing bindings for ZL/ZR
+    static constexpr std::array<std::pair<Settings::NativeButton::Values, PadAxes>, 2>
+        switch_to_gcadapter_axis = {
+            std::pair{Settings::NativeButton::ZL, PadAxes::TriggerLeft},
+            {Settings::NativeButton::ZR, PadAxes::TriggerRight},
+        };
+    for (const auto& [switch_button, gcadapter_axis] : switch_to_gcadapter_axis) {
+        Common::ParamPackage button_params({{"engine", "gcpad"}});
+        button_params.Set("port", params.Get("port", 0));
+        button_params.Set("button", static_cast<s32>(PadButton::Stick));
+        button_params.Set("axis", static_cast<s32>(gcadapter_axis));
+        button_params.Set("threshold", 0.5f);
+        button_params.Set("direction", "+");
+        mapping.insert_or_assign(switch_button, std::move(button_params));
+    }
+    return mapping;
+}
+
+InputCommon::AnalogMapping Adapter::GetAnalogMappingForDevice(
+    const Common::ParamPackage& params) const {
+    if (!params.Has("port")) {
+        return {};
+    }
+
+    InputCommon::AnalogMapping mapping = {};
+    Common::ParamPackage left_analog_params;
+    left_analog_params.Set("engine", "gcpad");
+    left_analog_params.Set("port", params.Get("port", 0));
+    left_analog_params.Set("axis_x", static_cast<int>(PadAxes::StickX));
+    left_analog_params.Set("axis_y", static_cast<int>(PadAxes::StickY));
+    mapping.insert_or_assign(Settings::NativeAnalog::LStick, std::move(left_analog_params));
+    Common::ParamPackage right_analog_params;
+    right_analog_params.Set("engine", "gcpad");
+    right_analog_params.Set("port", params.Get("port", 0));
+    right_analog_params.Set("axis_x", static_cast<int>(PadAxes::SubstickX));
+    right_analog_params.Set("axis_y", static_cast<int>(PadAxes::SubstickY));
+    mapping.insert_or_assign(Settings::NativeAnalog::RStick, std::move(right_analog_params));
+    return mapping;
+}
+
+bool Adapter::DeviceConnected(std::size_t port) const {
+    return pads[port].type != ControllerTypes::None;
+}
+
+void Adapter::BeginConfiguration() {
+    pad_queue.Clear();
+    configuring = true;
+}
+
+void Adapter::EndConfiguration() {
+    pad_queue.Clear();
+    configuring = false;
+}
+
+Common::SPSCQueue<GCPadStatus>& Adapter::GetPadQueue() {
+    return pad_queue;
+}
+
+const Common::SPSCQueue<GCPadStatus>& Adapter::GetPadQueue() const {
+    return pad_queue;
+}
+
+GCController& Adapter::GetPadState(std::size_t port) {
+    return pads.at(port);
+}
+
+const GCController& Adapter::GetPadState(std::size_t port) const {
+    return pads.at(port);
+}
+
+} // namespace GCAdapter

src/input_common/gcadapter/gc_adapter.h

@@ -0,0 +1,167 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+#include <algorithm>
+#include <functional>
+#include <mutex>
+#include <thread>
+#include <unordered_map>
+#include "common/common_types.h"
+#include "common/threadsafe_queue.h"
+#include "input_common/main.h"
+
+struct libusb_context;
+struct libusb_device;
+struct libusb_device_handle;
+
+namespace GCAdapter {
+
+enum class PadButton {
+    Undefined = 0x0000,
+    ButtonLeft = 0x0001,
+    ButtonRight = 0x0002,
+    ButtonDown = 0x0004,
+    ButtonUp = 0x0008,
+    TriggerZ = 0x0010,
+    TriggerR = 0x0020,
+    TriggerL = 0x0040,
+    ButtonA = 0x0100,
+    ButtonB = 0x0200,
+    ButtonX = 0x0400,
+    ButtonY = 0x0800,
+    ButtonStart = 0x1000,
+    // Below is for compatibility with "AxisButton" type
+    Stick = 0x2000,
+};
+
+enum class PadAxes : u8 {
+    StickX,
+    StickY,
+    SubstickX,
+    SubstickY,
+    TriggerLeft,
+    TriggerRight,
+    Undefined,
+};
+
+enum class ControllerTypes {
+    None,
+    Wired,
+    Wireless,
+};
+
+struct GCPadStatus {
+    std::size_t port{};
+
+    PadButton button{PadButton::Undefined}; // Or-ed PAD_BUTTON_* and PAD_TRIGGER_* bits
+
+    PadAxes axis{PadAxes::Undefined};
+    s16 axis_value{};
+    u8 axis_threshold{50};
+};
+
+struct GCController {
+    ControllerTypes type{};
+    bool enable_vibration{};
+    u8 rumble_amplitude{};
+    u16 buttons{};
+    PadButton last_button{};
+    std::array<s16, 6> axis_values{};
+    std::array<u8, 6> axis_origin{};
+};
+
+class Adapter {
+public:
+    Adapter();
+    ~Adapter();
+
+    /// Request a vibration for a controller
+    bool RumblePlay(std::size_t port, u8 amplitude);
+
+    /// Used for polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    Common::SPSCQueue<GCPadStatus>& GetPadQueue();
+    const Common::SPSCQueue<GCPadStatus>& GetPadQueue() const;
+
+    GCController& GetPadState(std::size_t port);
+    const GCController& GetPadState(std::size_t port) const;
+
+    /// Returns true if there is a device connected to port
+    bool DeviceConnected(std::size_t port) const;
+
+    /// Used for automapping features
+    std::vector<Common::ParamPackage> GetInputDevices() const;
+    InputCommon::ButtonMapping GetButtonMappingForDevice(const Common::ParamPackage& params) const;
+    InputCommon::AnalogMapping GetAnalogMappingForDevice(const Common::ParamPackage& params) const;
+
+private:
+    using AdapterPayload = std::array<u8, 37>;
+
+    void UpdatePadType(std::size_t port, ControllerTypes pad_type);
+    void UpdateControllers(const AdapterPayload& adapter_payload);
+    void UpdateYuzuSettings(std::size_t port);
+    void UpdateStateButtons(std::size_t port, u8 b1, u8 b2);
+    void UpdateStateAxes(std::size_t port, const AdapterPayload& adapter_payload);
+    void UpdateVibrations();
+
+    void AdapterInputThread();
+
+    void AdapterScanThread();
+
+    bool IsPayloadCorrect(const AdapterPayload& adapter_payload, s32 payload_size);
+
+    // Updates vibration state of all controllers
+    void SendVibrations();
+
+    /// For use in initialization, querying devices to find the adapter
+    void Setup();
+
+    /// Resets status of all GC controller devices to a disconected state
+    void ResetDevices();
+
+    /// Resets status of device connected to a disconected state
+    void ResetDevice(std::size_t port);
+
+    /// Returns true if we successfully gain access to GC Adapter
+    bool CheckDeviceAccess();
+
+    /// Captures GC Adapter endpoint address
+    /// Returns true if the endpoind was set correctly
+    bool GetGCEndpoint(libusb_device* device);
+
+    /// For shutting down, clear all data, join all threads, release usb
+    void Reset();
+
+    // Join all threads
+    void JoinThreads();
+
+    // Release usb handles
+    void ClearLibusbHandle();
+
+    libusb_device_handle* usb_adapter_handle = nullptr;
+    std::array<GCController, 4> pads;
+    Common::SPSCQueue<GCPadStatus> pad_queue;
+
+    std::thread adapter_input_thread;
+    std::thread adapter_scan_thread;
+    bool adapter_input_thread_running;
+    bool adapter_scan_thread_running;
+    bool restart_scan_thread;
+
+    libusb_context* libusb_ctx;
+
+    u8 input_endpoint{0};
+    u8 output_endpoint{0};
+    u8 input_error_counter{0};
+    u8 output_error_counter{0};
+    int vibration_counter{0};
+
+    bool configuring{false};
+    bool rumble_enabled{true};
+    bool vibration_changed{true};
+};
+} // namespace GCAdapter

src/input_common/gcadapter/gc_poller.cpp

@@ -0,0 +1,346 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <atomic>
+#include <list>
+#include <mutex>
+#include <utility>
+#include "common/assert.h"
+#include "common/threadsafe_queue.h"
+#include "input_common/gcadapter/gc_adapter.h"
+#include "input_common/gcadapter/gc_poller.h"
+
+namespace InputCommon {
+
+class GCButton final : public Input::ButtonDevice {
+public:
+    explicit GCButton(u32 port_, s32 button_, const GCAdapter::Adapter* adapter)
+        : port(port_), button(button_), gcadapter(adapter) {}
+
+    ~GCButton() override;
+
+    bool GetStatus() const override {
+        if (gcadapter->DeviceConnected(port)) {
+            return (gcadapter->GetPadState(port).buttons & button) != 0;
+        }
+        return false;
+    }
+
+private:
+    const u32 port;
+    const s32 button;
+    const GCAdapter::Adapter* gcadapter;
+};
+
+class GCAxisButton final : public Input::ButtonDevice {
+public:
+    explicit GCAxisButton(u32 port_, u32 axis_, float threshold_, bool trigger_if_greater_,
+                          const GCAdapter::Adapter* adapter)
+        : port(port_), axis(axis_), threshold(threshold_), trigger_if_greater(trigger_if_greater_),
+          gcadapter(adapter) {}
+
+    bool GetStatus() const override {
+        if (gcadapter->DeviceConnected(port)) {
+            const float current_axis_value = gcadapter->GetPadState(port).axis_values.at(axis);
+            const float axis_value = current_axis_value / 128.0f;
+            if (trigger_if_greater) {
+                // TODO: Might be worthwile to set a slider for the trigger threshold. It is
+                // currently always set to 0.5 in configure_input_player.cpp ZL/ZR HandleClick
+                return axis_value > threshold;
+            }
+            return axis_value < -threshold;
+        }
+        return false;
+    }
+
+private:
+    const u32 port;
+    const u32 axis;
+    float threshold;
+    bool trigger_if_greater;
+    const GCAdapter::Adapter* gcadapter;
+};
+
+GCButtonFactory::GCButtonFactory(std::shared_ptr<GCAdapter::Adapter> adapter_)
+    : adapter(std::move(adapter_)) {}
+
+GCButton::~GCButton() = default;
+
+std::unique_ptr<Input::ButtonDevice> GCButtonFactory::Create(const Common::ParamPackage& params) {
+    const auto button_id = params.Get("button", 0);
+    const auto port = static_cast<u32>(params.Get("port", 0));
+
+    constexpr s32 PAD_STICK_ID = static_cast<s32>(GCAdapter::PadButton::Stick);
+
+    // button is not an axis/stick button
+    if (button_id != PAD_STICK_ID) {
+        return std::make_unique<GCButton>(port, button_id, adapter.get());
+    }
+
+    // For Axis buttons, used by the binary sticks.
+    if (button_id == PAD_STICK_ID) {
+        const int axis = params.Get("axis", 0);
+        const float threshold = params.Get("threshold", 0.25f);
+        const std::string direction_name = params.Get("direction", "");
+        bool trigger_if_greater;
+        if (direction_name == "+") {
+            trigger_if_greater = true;
+        } else if (direction_name == "-") {
+            trigger_if_greater = false;
+        } else {
+            trigger_if_greater = true;
+            LOG_ERROR(Input, "Unknown direction {}", direction_name);
+        }
+        return std::make_unique<GCAxisButton>(port, axis, threshold, trigger_if_greater,
+                                              adapter.get());
+    }
+
+    return nullptr;
+}
+
+Common::ParamPackage GCButtonFactory::GetNextInput() const {
+    Common::ParamPackage params;
+    GCAdapter::GCPadStatus pad;
+    auto& queue = adapter->GetPadQueue();
+    while (queue.Pop(pad)) {
+        // This while loop will break on the earliest detected button
+        params.Set("engine", "gcpad");
+        params.Set("port", static_cast<s32>(pad.port));
+        if (pad.button != GCAdapter::PadButton::Undefined) {
+            params.Set("button", static_cast<u16>(pad.button));
+        }
+
+        // For Axis button implementation
+        if (pad.axis != GCAdapter::PadAxes::Undefined) {
+            params.Set("axis", static_cast<u8>(pad.axis));
+            params.Set("button", static_cast<u16>(GCAdapter::PadButton::Stick));
+            params.Set("threshold", "0.25");
+            if (pad.axis_value > 0) {
+                params.Set("direction", "+");
+            } else {
+                params.Set("direction", "-");
+            }
+            break;
+        }
+    }
+    return params;
+}
+
+void GCButtonFactory::BeginConfiguration() {
+    polling = true;
+    adapter->BeginConfiguration();
+}
+
+void GCButtonFactory::EndConfiguration() {
+    polling = false;
+    adapter->EndConfiguration();
+}
+
+class GCAnalog final : public Input::AnalogDevice {
+public:
+    explicit GCAnalog(u32 port_, u32 axis_x_, u32 axis_y_, bool invert_x_, bool invert_y_,
+                      float deadzone_, float range_, const GCAdapter::Adapter* adapter)
+        : port(port_), axis_x(axis_x_), axis_y(axis_y_), invert_x(invert_x_), invert_y(invert_y_),
+          deadzone(deadzone_), range(range_), gcadapter(adapter) {}
+
+    float GetAxis(u32 axis) const {
+        if (gcadapter->DeviceConnected(port)) {
+            std::lock_guard lock{mutex};
+            const auto axis_value =
+                static_cast<float>(gcadapter->GetPadState(port).axis_values.at(axis));
+            return (axis_value) / (100.0f * range);
+        }
+        return 0.0f;
+    }
+
+    std::pair<float, float> GetAnalog(u32 analog_axis_x, u32 analog_axis_y) const {
+        float x = GetAxis(analog_axis_x);
+        float y = GetAxis(analog_axis_y);
+        if (invert_x) {
+            x = -x;
+        }
+        if (invert_y) {
+            y = -y;
+        }
+        // Make sure the coordinates are in the unit circle,
+        // otherwise normalize it.
+        float r = x * x + y * y;
+        if (r > 1.0f) {
+            r = std::sqrt(r);
+            x /= r;
+            y /= r;
+        }
+
+        return {x, y};
+    }
+
+    std::tuple<float, float> GetStatus() const override {
+        const auto [x, y] = GetAnalog(axis_x, axis_y);
+        const float r = std::sqrt((x * x) + (y * y));
+        if (r > deadzone) {
+            return {x / r * (r - deadzone) / (1 - deadzone),
+                    y / r * (r - deadzone) / (1 - deadzone)};
+        }
+        return {0.0f, 0.0f};
+    }
+
+    bool GetAnalogDirectionStatus(Input::AnalogDirection direction) const override {
+        const auto [x, y] = GetStatus();
+        const float directional_deadzone = 0.5f;
+        switch (direction) {
+        case Input::AnalogDirection::RIGHT:
+            return x > directional_deadzone;
+        case Input::AnalogDirection::LEFT:
+            return x < -directional_deadzone;
+        case Input::AnalogDirection::UP:
+            return y > directional_deadzone;
+        case Input::AnalogDirection::DOWN:
+            return y < -directional_deadzone;
+        }
+        return false;
+    }
+
+private:
+    const u32 port;
+    const u32 axis_x;
+    const u32 axis_y;
+    const bool invert_x;
+    const bool invert_y;
+    const float deadzone;
+    const float range;
+    const GCAdapter::Adapter* gcadapter;
+    mutable std::mutex mutex;
+};
+
+/// An analog device factory that creates analog devices from GC Adapter
+GCAnalogFactory::GCAnalogFactory(std::shared_ptr<GCAdapter::Adapter> adapter_)
+    : adapter(std::move(adapter_)) {}
+
+/**
+ * Creates analog device from joystick axes
+ * @param params contains parameters for creating the device:
+ *     - "port": the nth gcpad on the adapter
+ *     - "axis_x": the index of the axis to be bind as x-axis
+ *     - "axis_y": the index of the axis to be bind as y-axis
+ */
+std::unique_ptr<Input::AnalogDevice> GCAnalogFactory::Create(const Common::ParamPackage& params) {
+    const auto port = static_cast<u32>(params.Get("port", 0));
+    const auto axis_x = static_cast<u32>(params.Get("axis_x", 0));
+    const auto axis_y = static_cast<u32>(params.Get("axis_y", 1));
+    const auto deadzone = std::clamp(params.Get("deadzone", 0.0f), 0.0f, 1.0f);
+    const auto range = std::clamp(params.Get("range", 1.0f), 0.50f, 1.50f);
+    const std::string invert_x_value = params.Get("invert_x", "+");
+    const std::string invert_y_value = params.Get("invert_y", "+");
+    const bool invert_x = invert_x_value == "-";
+    const bool invert_y = invert_y_value == "-";
+
+    return std::make_unique<GCAnalog>(port, axis_x, axis_y, invert_x, invert_y, deadzone, range,
+                                      adapter.get());
+}
+
+void GCAnalogFactory::BeginConfiguration() {
+    polling = true;
+    adapter->BeginConfiguration();
+}
+
+void GCAnalogFactory::EndConfiguration() {
+    polling = false;
+    adapter->EndConfiguration();
+}
+
+Common::ParamPackage GCAnalogFactory::GetNextInput() {
+    GCAdapter::GCPadStatus pad;
+    Common::ParamPackage params;
+    auto& queue = adapter->GetPadQueue();
+    while (queue.Pop(pad)) {
+        if (pad.button != GCAdapter::PadButton::Undefined) {
+            params.Set("engine", "gcpad");
+            params.Set("port", static_cast<s32>(pad.port));
+            params.Set("button", static_cast<u16>(pad.button));
+            return params;
+        }
+        if (pad.axis == GCAdapter::PadAxes::Undefined ||
+            std::abs(static_cast<float>(pad.axis_value) / 128.0f) < 0.1f) {
+            continue;
+        }
+        // An analog device needs two axes, so we need to store the axis for later and wait for
+        // a second input event. The axes also must be from the same joystick.
+        const u8 axis = static_cast<u8>(pad.axis);
+        if (axis == 0 || axis == 1) {
+            analog_x_axis = 0;
+            analog_y_axis = 1;
+            controller_number = static_cast<s32>(pad.port);
+            break;
+        }
+        if (axis == 2 || axis == 3) {
+            analog_x_axis = 2;
+            analog_y_axis = 3;
+            controller_number = static_cast<s32>(pad.port);
+            break;
+        }
+
+        if (analog_x_axis == -1) {
+            analog_x_axis = axis;
+            controller_number = static_cast<s32>(pad.port);
+        } else if (analog_y_axis == -1 && analog_x_axis != axis &&
+                   controller_number == static_cast<s32>(pad.port)) {
+            analog_y_axis = axis;
+            break;
+        }
+    }
+    if (analog_x_axis != -1 && analog_y_axis != -1) {
+        params.Set("engine", "gcpad");
+        params.Set("port", controller_number);
+        params.Set("axis_x", analog_x_axis);
+        params.Set("axis_y", analog_y_axis);
+        params.Set("invert_x", "+");
+        params.Set("invert_y", "+");
+        analog_x_axis = -1;
+        analog_y_axis = -1;
+        controller_number = -1;
+        return params;
+    }
+    return params;
+}
+
+class GCVibration final : public Input::VibrationDevice {
+public:
+    explicit GCVibration(u32 port_, GCAdapter::Adapter* adapter)
+        : port(port_), gcadapter(adapter) {}
+
+    u8 GetStatus() const override {
+        return gcadapter->RumblePlay(port, 0);
+    }
+
+    bool SetRumblePlay(f32 amp_low, [[maybe_unused]] f32 freq_low, f32 amp_high,
+                       [[maybe_unused]] f32 freq_high) const override {
+        const auto mean_amplitude = (amp_low + amp_high) * 0.5f;
+        const auto processed_amplitude =
+            static_cast<u8>((mean_amplitude + std::pow(mean_amplitude, 0.3f)) * 0.5f * 0x8);
+
+        return gcadapter->RumblePlay(port, processed_amplitude);
+    }
+
+private:
+    const u32 port;
+    GCAdapter::Adapter* gcadapter;
+};
+
+/// An vibration device factory that creates vibration devices from GC Adapter
+GCVibrationFactory::GCVibrationFactory(std::shared_ptr<GCAdapter::Adapter> adapter_)
+    : adapter(std::move(adapter_)) {}
+
+/**
+ * Creates a vibration device from a joystick
+ * @param params contains parameters for creating the device:
+ *     - "port": the nth gcpad on the adapter
+ */
+std::unique_ptr<Input::VibrationDevice> GCVibrationFactory::Create(
+    const Common::ParamPackage& params) {
+    const auto port = static_cast<u32>(params.Get("port", 0));
+
+    return std::make_unique<GCVibration>(port, adapter.get());
+}
+
+} // namespace InputCommon

src/input_common/gcadapter/gc_poller.h

@@ -0,0 +1,78 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "core/frontend/input.h"
+#include "input_common/gcadapter/gc_adapter.h"
+
+namespace InputCommon {
+
+/**
+ * A button device factory representing a gcpad. It receives gcpad events and forward them
+ * to all button devices it created.
+ */
+class GCButtonFactory final : public Input::Factory<Input::ButtonDevice> {
+public:
+    explicit GCButtonFactory(std::shared_ptr<GCAdapter::Adapter> adapter_);
+
+    /**
+     * Creates a button device from a button press
+     * @param params contains parameters for creating the device:
+     *     - "code": the code of the key to bind with the button
+     */
+    std::unique_ptr<Input::ButtonDevice> Create(const Common::ParamPackage& params) override;
+
+    Common::ParamPackage GetNextInput() const;
+
+    /// For device input configuration/polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    bool IsPolling() const {
+        return polling;
+    }
+
+private:
+    std::shared_ptr<GCAdapter::Adapter> adapter;
+    bool polling = false;
+};
+
+/// An analog device factory that creates analog devices from GC Adapter
+class GCAnalogFactory final : public Input::Factory<Input::AnalogDevice> {
+public:
+    explicit GCAnalogFactory(std::shared_ptr<GCAdapter::Adapter> adapter_);
+
+    std::unique_ptr<Input::AnalogDevice> Create(const Common::ParamPackage& params) override;
+    Common::ParamPackage GetNextInput();
+
+    /// For device input configuration/polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    bool IsPolling() const {
+        return polling;
+    }
+
+private:
+    std::shared_ptr<GCAdapter::Adapter> adapter;
+    int analog_x_axis = -1;
+    int analog_y_axis = -1;
+    int controller_number = -1;
+    bool polling = false;
+};
+
+/// A vibration device factory creates vibration devices from GC Adapter
+class GCVibrationFactory final : public Input::Factory<Input::VibrationDevice> {
+public:
+    explicit GCVibrationFactory(std::shared_ptr<GCAdapter::Adapter> adapter_);
+
+    std::unique_ptr<Input::VibrationDevice> Create(const Common::ParamPackage& params) override;
+
+private:
+    std::shared_ptr<GCAdapter::Adapter> adapter;
+};
+
+} // namespace InputCommon

src/input_common/keyboard.cpp

@@ -0,0 +1,95 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <atomic>
+#include <list>
+#include <mutex>
+#include <utility>
+#include "input_common/keyboard.h"
+
+namespace InputCommon {
+
+class KeyButton final : public Input::ButtonDevice {
+public:
+    explicit KeyButton(std::shared_ptr<KeyButtonList> key_button_list_)
+        : key_button_list(std::move(key_button_list_)) {}
+
+    ~KeyButton() override;
+
+    bool GetStatus() const override {
+        return status.load();
+    }
+
+    friend class KeyButtonList;
+
+private:
+    std::shared_ptr<KeyButtonList> key_button_list;
+    std::atomic<bool> status{false};
+};
+
+struct KeyButtonPair {
+    int key_code;
+    KeyButton* key_button;
+};
+
+class KeyButtonList {
+public:
+    void AddKeyButton(int key_code, KeyButton* key_button) {
+        std::lock_guard guard{mutex};
+        list.push_back(KeyButtonPair{key_code, key_button});
+    }
+
+    void RemoveKeyButton(const KeyButton* key_button) {
+        std::lock_guard guard{mutex};
+        list.remove_if(
+            [key_button](const KeyButtonPair& pair) { return pair.key_button == key_button; });
+    }
+
+    void ChangeKeyStatus(int key_code, bool pressed) {
+        std::lock_guard guard{mutex};
+        for (const KeyButtonPair& pair : list) {
+            if (pair.key_code == key_code) {
+                pair.key_button->status.store(pressed);
+            }
+        }
+    }
+
+    void ChangeAllKeyStatus(bool pressed) {
+        std::lock_guard guard{mutex};
+        for (const KeyButtonPair& pair : list) {
+            pair.key_button->status.store(pressed);
+        }
+    }
+
+private:
+    std::mutex mutex;
+    std::list<KeyButtonPair> list;
+};
+
+Keyboard::Keyboard() : key_button_list{std::make_shared<KeyButtonList>()} {}
+
+KeyButton::~KeyButton() {
+    key_button_list->RemoveKeyButton(this);
+}
+
+std::unique_ptr<Input::ButtonDevice> Keyboard::Create(const Common::ParamPackage& params) {
+    const int key_code = params.Get("code", 0);
+    std::unique_ptr<KeyButton> button = std::make_unique<KeyButton>(key_button_list);
+    key_button_list->AddKeyButton(key_code, button.get());
+    return button;
+}
+
+void Keyboard::PressKey(int key_code) {
+    key_button_list->ChangeKeyStatus(key_code, true);
+}
+
+void Keyboard::ReleaseKey(int key_code) {
+    key_button_list->ChangeKeyStatus(key_code, false);
+}
+
+void Keyboard::ReleaseAllKeys() {
+    key_button_list->ChangeAllKeyStatus(false);
+}
+
+} // namespace InputCommon

src/input_common/keyboard.h

@@ -0,0 +1,47 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "core/frontend/input.h"
+
+namespace InputCommon {
+
+class KeyButtonList;
+
+/**
+ * A button device factory representing a keyboard. It receives keyboard events and forward them
+ * to all button devices it created.
+ */
+class Keyboard final : public Input::Factory<Input::ButtonDevice> {
+public:
+    Keyboard();
+
+    /**
+     * Creates a button device from a keyboard key
+     * @param params contains parameters for creating the device:
+     *     - "code": the code of the key to bind with the button
+     */
+    std::unique_ptr<Input::ButtonDevice> Create(const Common::ParamPackage& params) override;
+
+    /**
+     * Sets the status of all buttons bound with the key to pressed
+     * @param key_code the code of the key to press
+     */
+    void PressKey(int key_code);
+
+    /**
+     * Sets the status of all buttons bound with the key to released
+     * @param key_code the code of the key to release
+     */
+    void ReleaseKey(int key_code);
+
+    void ReleaseAllKeys();
+
+private:
+    std::shared_ptr<KeyButtonList> key_button_list;
+};
+
+} // namespace InputCommon

src/input_common/main.cpp

@@ -0,0 +1,322 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <memory>
+#include <thread>
+#include "common/param_package.h"
+#include "input_common/analog_from_button.h"
+#include "input_common/gcadapter/gc_adapter.h"
+#include "input_common/gcadapter/gc_poller.h"
+#include "input_common/keyboard.h"
+#include "input_common/main.h"
+#include "input_common/motion_from_button.h"
+#include "input_common/mouse/mouse_input.h"
+#include "input_common/mouse/mouse_poller.h"
+#include "input_common/touch_from_button.h"
+#include "input_common/udp/client.h"
+#include "input_common/udp/udp.h"
+#ifdef HAVE_SDL2
+#include "input_common/sdl/sdl.h"
+#endif
+
+namespace InputCommon {
+
+struct InputSubsystem::Impl {
+    void Initialize() {
+        gcadapter = std::make_shared<GCAdapter::Adapter>();
+        gcbuttons = std::make_shared<GCButtonFactory>(gcadapter);
+        Input::RegisterFactory<Input::ButtonDevice>("gcpad", gcbuttons);
+        gcanalog = std::make_shared<GCAnalogFactory>(gcadapter);
+        Input::RegisterFactory<Input::AnalogDevice>("gcpad", gcanalog);
+        gcvibration = std::make_shared<GCVibrationFactory>(gcadapter);
+        Input::RegisterFactory<Input::VibrationDevice>("gcpad", gcvibration);
+
+        keyboard = std::make_shared<Keyboard>();
+        Input::RegisterFactory<Input::ButtonDevice>("keyboard", keyboard);
+        Input::RegisterFactory<Input::AnalogDevice>("analog_from_button",
+                                                    std::make_shared<AnalogFromButton>());
+        Input::RegisterFactory<Input::MotionDevice>("keyboard",
+                                                    std::make_shared<MotionFromButton>());
+        Input::RegisterFactory<Input::TouchDevice>("touch_from_button",
+                                                   std::make_shared<TouchFromButtonFactory>());
+
+#ifdef HAVE_SDL2
+        sdl = SDL::Init();
+#endif
+
+        udp = std::make_shared<InputCommon::CemuhookUDP::Client>();
+        udpmotion = std::make_shared<UDPMotionFactory>(udp);
+        Input::RegisterFactory<Input::MotionDevice>("cemuhookudp", udpmotion);
+        udptouch = std::make_shared<UDPTouchFactory>(udp);
+        Input::RegisterFactory<Input::TouchDevice>("cemuhookudp", udptouch);
+
+        mouse = std::make_shared<MouseInput::Mouse>();
+        mousebuttons = std::make_shared<MouseButtonFactory>(mouse);
+        Input::RegisterFactory<Input::ButtonDevice>("mouse", mousebuttons);
+        mouseanalog = std::make_shared<MouseAnalogFactory>(mouse);
+        Input::RegisterFactory<Input::AnalogDevice>("mouse", mouseanalog);
+        mousemotion = std::make_shared<MouseMotionFactory>(mouse);
+        Input::RegisterFactory<Input::MotionDevice>("mouse", mousemotion);
+        mousetouch = std::make_shared<MouseTouchFactory>(mouse);
+        Input::RegisterFactory<Input::TouchDevice>("mouse", mousetouch);
+    }
+
+    void Shutdown() {
+        Input::UnregisterFactory<Input::ButtonDevice>("keyboard");
+        Input::UnregisterFactory<Input::MotionDevice>("keyboard");
+        keyboard.reset();
+        Input::UnregisterFactory<Input::AnalogDevice>("analog_from_button");
+        Input::UnregisterFactory<Input::TouchDevice>("touch_from_button");
+#ifdef HAVE_SDL2
+        sdl.reset();
+#endif
+        Input::UnregisterFactory<Input::ButtonDevice>("gcpad");
+        Input::UnregisterFactory<Input::AnalogDevice>("gcpad");
+        Input::UnregisterFactory<Input::VibrationDevice>("gcpad");
+
+        gcbuttons.reset();
+        gcanalog.reset();
+        gcvibration.reset();
+
+        Input::UnregisterFactory<Input::MotionDevice>("cemuhookudp");
+        Input::UnregisterFactory<Input::TouchDevice>("cemuhookudp");
+
+        udpmotion.reset();
+        udptouch.reset();
+
+        Input::UnregisterFactory<Input::ButtonDevice>("mouse");
+        Input::UnregisterFactory<Input::AnalogDevice>("mouse");
+        Input::UnregisterFactory<Input::MotionDevice>("mouse");
+        Input::UnregisterFactory<Input::TouchDevice>("mouse");
+
+        mousebuttons.reset();
+        mouseanalog.reset();
+        mousemotion.reset();
+        mousetouch.reset();
+    }
+
+    [[nodiscard]] std::vector<Common::ParamPackage> GetInputDevices() const {
+        std::vector<Common::ParamPackage> devices = {
+            Common::ParamPackage{{"display", "Any"}, {"class", "any"}},
+            Common::ParamPackage{{"display", "Keyboard/Mouse"}, {"class", "keyboard"}},
+        };
+#ifdef HAVE_SDL2
+        auto sdl_devices = sdl->GetInputDevices();
+        devices.insert(devices.end(), sdl_devices.begin(), sdl_devices.end());
+#endif
+        auto udp_devices = udp->GetInputDevices();
+        devices.insert(devices.end(), udp_devices.begin(), udp_devices.end());
+        auto gcpad_devices = gcadapter->GetInputDevices();
+        devices.insert(devices.end(), gcpad_devices.begin(), gcpad_devices.end());
+        return devices;
+    }
+
+    [[nodiscard]] AnalogMapping GetAnalogMappingForDevice(
+        const Common::ParamPackage& params) const {
+        if (!params.Has("class") || params.Get("class", "") == "any") {
+            return {};
+        }
+        if (params.Get("class", "") == "gcpad") {
+            return gcadapter->GetAnalogMappingForDevice(params);
+        }
+#ifdef HAVE_SDL2
+        if (params.Get("class", "") == "sdl") {
+            return sdl->GetAnalogMappingForDevice(params);
+        }
+#endif
+        return {};
+    }
+
+    [[nodiscard]] ButtonMapping GetButtonMappingForDevice(
+        const Common::ParamPackage& params) const {
+        if (!params.Has("class") || params.Get("class", "") == "any") {
+            return {};
+        }
+        if (params.Get("class", "") == "gcpad") {
+            return gcadapter->GetButtonMappingForDevice(params);
+        }
+#ifdef HAVE_SDL2
+        if (params.Get("class", "") == "sdl") {
+            return sdl->GetButtonMappingForDevice(params);
+        }
+#endif
+        return {};
+    }
+
+    [[nodiscard]] MotionMapping GetMotionMappingForDevice(
+        const Common::ParamPackage& params) const {
+        if (!params.Has("class") || params.Get("class", "") == "any") {
+            return {};
+        }
+        if (params.Get("class", "") == "cemuhookudp") {
+            // TODO return the correct motion device
+            return {};
+        }
+        return {};
+    }
+
+    std::shared_ptr<Keyboard> keyboard;
+#ifdef HAVE_SDL2
+    std::unique_ptr<SDL::State> sdl;
+#endif
+    std::shared_ptr<GCButtonFactory> gcbuttons;
+    std::shared_ptr<GCAnalogFactory> gcanalog;
+    std::shared_ptr<GCVibrationFactory> gcvibration;
+    std::shared_ptr<UDPMotionFactory> udpmotion;
+    std::shared_ptr<UDPTouchFactory> udptouch;
+    std::shared_ptr<MouseButtonFactory> mousebuttons;
+    std::shared_ptr<MouseAnalogFactory> mouseanalog;
+    std::shared_ptr<MouseMotionFactory> mousemotion;
+    std::shared_ptr<MouseTouchFactory> mousetouch;
+    std::shared_ptr<CemuhookUDP::Client> udp;
+    std::shared_ptr<GCAdapter::Adapter> gcadapter;
+    std::shared_ptr<MouseInput::Mouse> mouse;
+};
+
+InputSubsystem::InputSubsystem() : impl{std::make_unique<Impl>()} {}
+
+InputSubsystem::~InputSubsystem() = default;
+
+void InputSubsystem::Initialize() {
+    impl->Initialize();
+}
+
+void InputSubsystem::Shutdown() {
+    impl->Shutdown();
+}
+
+Keyboard* InputSubsystem::GetKeyboard() {
+    return impl->keyboard.get();
+}
+
+const Keyboard* InputSubsystem::GetKeyboard() const {
+    return impl->keyboard.get();
+}
+
+MouseInput::Mouse* InputSubsystem::GetMouse() {
+    return impl->mouse.get();
+}
+
+const MouseInput::Mouse* InputSubsystem::GetMouse() const {
+    return impl->mouse.get();
+}
+
+std::vector<Common::ParamPackage> InputSubsystem::GetInputDevices() const {
+    return impl->GetInputDevices();
+}
+
+AnalogMapping InputSubsystem::GetAnalogMappingForDevice(const Common::ParamPackage& device) const {
+    return impl->GetAnalogMappingForDevice(device);
+}
+
+ButtonMapping InputSubsystem::GetButtonMappingForDevice(const Common::ParamPackage& device) const {
+    return impl->GetButtonMappingForDevice(device);
+}
+
+MotionMapping InputSubsystem::GetMotionMappingForDevice(const Common::ParamPackage& device) const {
+    return impl->GetMotionMappingForDevice(device);
+}
+
+GCAnalogFactory* InputSubsystem::GetGCAnalogs() {
+    return impl->gcanalog.get();
+}
+
+const GCAnalogFactory* InputSubsystem::GetGCAnalogs() const {
+    return impl->gcanalog.get();
+}
+
+GCButtonFactory* InputSubsystem::GetGCButtons() {
+    return impl->gcbuttons.get();
+}
+
+const GCButtonFactory* InputSubsystem::GetGCButtons() const {
+    return impl->gcbuttons.get();
+}
+
+UDPMotionFactory* InputSubsystem::GetUDPMotions() {
+    return impl->udpmotion.get();
+}
+
+const UDPMotionFactory* InputSubsystem::GetUDPMotions() const {
+    return impl->udpmotion.get();
+}
+
+UDPTouchFactory* InputSubsystem::GetUDPTouch() {
+    return impl->udptouch.get();
+}
+
+const UDPTouchFactory* InputSubsystem::GetUDPTouch() const {
+    return impl->udptouch.get();
+}
+
+MouseButtonFactory* InputSubsystem::GetMouseButtons() {
+    return impl->mousebuttons.get();
+}
+
+const MouseButtonFactory* InputSubsystem::GetMouseButtons() const {
+    return impl->mousebuttons.get();
+}
+
+MouseAnalogFactory* InputSubsystem::GetMouseAnalogs() {
+    return impl->mouseanalog.get();
+}
+
+const MouseAnalogFactory* InputSubsystem::GetMouseAnalogs() const {
+    return impl->mouseanalog.get();
+}
+
+MouseMotionFactory* InputSubsystem::GetMouseMotions() {
+    return impl->mousemotion.get();
+}
+
+const MouseMotionFactory* InputSubsystem::GetMouseMotions() const {
+    return impl->mousemotion.get();
+}
+
+MouseTouchFactory* InputSubsystem::GetMouseTouch() {
+    return impl->mousetouch.get();
+}
+
+const MouseTouchFactory* InputSubsystem::GetMouseTouch() const {
+    return impl->mousetouch.get();
+}
+
+void InputSubsystem::ReloadInputDevices() {
+    if (!impl->udp) {
+        return;
+    }
+    impl->udp->ReloadSockets();
+}
+
+std::vector<std::unique_ptr<Polling::DevicePoller>> InputSubsystem::GetPollers(
+    Polling::DeviceType type) const {
+#ifdef HAVE_SDL2
+    return impl->sdl->GetPollers(type);
+#else
+    return {};
+#endif
+}
+
+std::string GenerateKeyboardParam(int key_code) {
+    Common::ParamPackage param{
+        {"engine", "keyboard"},
+        {"code", std::to_string(key_code)},
+    };
+    return param.Serialize();
+}
+
+std::string GenerateAnalogParamFromKeys(int key_up, int key_down, int key_left, int key_right,
+                                        int key_modifier, float modifier_scale) {
+    Common::ParamPackage circle_pad_param{
+        {"engine", "analog_from_button"},
+        {"up", GenerateKeyboardParam(key_up)},
+        {"down", GenerateKeyboardParam(key_down)},
+        {"left", GenerateKeyboardParam(key_left)},
+        {"right", GenerateKeyboardParam(key_right)},
+        {"modifier", GenerateKeyboardParam(key_modifier)},
+        {"modifier_scale", std::to_string(modifier_scale)},
+    };
+    return circle_pad_param.Serialize();
+}
+} // namespace InputCommon

src/input_common/main.h

@@ -0,0 +1,190 @@
+// 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 <unordered_map>
+#include <vector>
+
+namespace Common {
+class ParamPackage;
+}
+
+namespace Settings::NativeAnalog {
+enum Values : int;
+}
+
+namespace Settings::NativeButton {
+enum Values : int;
+}
+
+namespace Settings::NativeMotion {
+enum Values : int;
+}
+
+namespace MouseInput {
+class Mouse;
+}
+
+namespace InputCommon {
+namespace Polling {
+
+enum class DeviceType { Button, AnalogPreferred, Motion };
+
+/**
+ * A class that can be used to get inputs from an input device like controllers without having to
+ * poll the device's status yourself
+ */
+class DevicePoller {
+public:
+    virtual ~DevicePoller() = default;
+    /// Setup and start polling for inputs, should be called before GetNextInput
+    /// If a device_id is provided, events should be filtered to only include events from this
+    /// device id
+    virtual void Start(const std::string& device_id = "") = 0;
+    /// Stop polling
+    virtual void Stop() = 0;
+    /**
+     * Every call to this function returns the next input recorded since calling Start
+     * @return A ParamPackage of the recorded input, which can be used to create an InputDevice.
+     *         If there has been no input, the package is empty
+     */
+    virtual Common::ParamPackage GetNextInput() = 0;
+};
+} // namespace Polling
+
+class GCAnalogFactory;
+class GCButtonFactory;
+class UDPMotionFactory;
+class UDPTouchFactory;
+class MouseButtonFactory;
+class MouseAnalogFactory;
+class MouseMotionFactory;
+class MouseTouchFactory;
+class Keyboard;
+
+/**
+ * Given a ParamPackage for a Device returned from `GetInputDevices`, attempt to get the default
+ * mapping for the device. This is currently only implemented for the SDL backend devices.
+ */
+using AnalogMapping = std::unordered_map<Settings::NativeAnalog::Values, Common::ParamPackage>;
+using ButtonMapping = std::unordered_map<Settings::NativeButton::Values, Common::ParamPackage>;
+using MotionMapping = std::unordered_map<Settings::NativeMotion::Values, Common::ParamPackage>;
+
+class InputSubsystem {
+public:
+    explicit InputSubsystem();
+    ~InputSubsystem();
+
+    InputSubsystem(const InputSubsystem&) = delete;
+    InputSubsystem& operator=(const InputSubsystem&) = delete;
+
+    InputSubsystem(InputSubsystem&&) = delete;
+    InputSubsystem& operator=(InputSubsystem&&) = delete;
+
+    /// Initializes and registers all built-in input device factories.
+    void Initialize();
+
+    /// Unregisters all built-in input device factories and shuts them down.
+    void Shutdown();
+
+    /// Retrieves the underlying keyboard device.
+    [[nodiscard]] Keyboard* GetKeyboard();
+
+    /// Retrieves the underlying keyboard device.
+    [[nodiscard]] const Keyboard* GetKeyboard() const;
+
+    /// Retrieves the underlying mouse device.
+    [[nodiscard]] MouseInput::Mouse* GetMouse();
+
+    /// Retrieves the underlying mouse device.
+    [[nodiscard]] const MouseInput::Mouse* GetMouse() const;
+
+    /**
+     * Returns all available input devices that this Factory can create a new device with.
+     * Each returned ParamPackage should have a `display` field used for display, a class field for
+     * backends to determine if this backend is meant to service the request and any other
+     * information needed to identify this in the backend later.
+     */
+    [[nodiscard]] std::vector<Common::ParamPackage> GetInputDevices() const;
+
+    /// Retrieves the analog mappings for the given device.
+    [[nodiscard]] AnalogMapping GetAnalogMappingForDevice(const Common::ParamPackage& device) const;
+
+    /// Retrieves the button mappings for the given device.
+    [[nodiscard]] ButtonMapping GetButtonMappingForDevice(const Common::ParamPackage& device) const;
+
+    /// Retrieves the motion mappings for the given device.
+    [[nodiscard]] MotionMapping GetMotionMappingForDevice(const Common::ParamPackage& device) const;
+
+    /// Retrieves the underlying GameCube analog handler.
+    [[nodiscard]] GCAnalogFactory* GetGCAnalogs();
+
+    /// Retrieves the underlying GameCube analog handler.
+    [[nodiscard]] const GCAnalogFactory* GetGCAnalogs() const;
+
+    /// Retrieves the underlying GameCube button handler.
+    [[nodiscard]] GCButtonFactory* GetGCButtons();
+
+    /// Retrieves the underlying GameCube button handler.
+    [[nodiscard]] const GCButtonFactory* GetGCButtons() const;
+
+    /// Retrieves the underlying udp motion handler.
+    [[nodiscard]] UDPMotionFactory* GetUDPMotions();
+
+    /// Retrieves the underlying udp motion handler.
+    [[nodiscard]] const UDPMotionFactory* GetUDPMotions() const;
+
+    /// Retrieves the underlying udp touch handler.
+    [[nodiscard]] UDPTouchFactory* GetUDPTouch();
+
+    /// Retrieves the underlying udp touch handler.
+    [[nodiscard]] const UDPTouchFactory* GetUDPTouch() const;
+
+    /// Retrieves the underlying GameCube button handler.
+    [[nodiscard]] MouseButtonFactory* GetMouseButtons();
+
+    /// Retrieves the underlying GameCube button handler.
+    [[nodiscard]] const MouseButtonFactory* GetMouseButtons() const;
+
+    /// Retrieves the underlying udp touch handler.
+    [[nodiscard]] MouseAnalogFactory* GetMouseAnalogs();
+
+    /// Retrieves the underlying udp touch handler.
+    [[nodiscard]] const MouseAnalogFactory* GetMouseAnalogs() const;
+
+    /// Retrieves the underlying udp motion handler.
+    [[nodiscard]] MouseMotionFactory* GetMouseMotions();
+
+    /// Retrieves the underlying udp motion handler.
+    [[nodiscard]] const MouseMotionFactory* GetMouseMotions() const;
+
+    /// Retrieves the underlying udp touch handler.
+    [[nodiscard]] MouseTouchFactory* GetMouseTouch();
+
+    /// Retrieves the underlying udp touch handler.
+    [[nodiscard]] const MouseTouchFactory* GetMouseTouch() const;
+
+    /// Reloads the input devices
+    void ReloadInputDevices();
+
+    /// Get all DevicePoller from all backends for a specific device type
+    [[nodiscard]] std::vector<std::unique_ptr<Polling::DevicePoller>> GetPollers(
+        Polling::DeviceType type) const;
+
+private:
+    struct Impl;
+    std::unique_ptr<Impl> impl;
+};
+
+/// Generates a serialized param package for creating a keyboard button device
+std::string GenerateKeyboardParam(int key_code);
+
+/// Generates a serialized param package for creating an analog device taking input from keyboard
+std::string GenerateAnalogParamFromKeys(int key_up, int key_down, int key_left, int key_right,
+                                        int key_modifier, float modifier_scale);
+
+} // namespace InputCommon

src/input_common/motion_from_button.cpp

@@ -0,0 +1,34 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "input_common/motion_from_button.h"
+#include "input_common/motion_input.h"
+
+namespace InputCommon {
+
+class MotionKey final : public Input::MotionDevice {
+public:
+    using Button = std::unique_ptr<Input::ButtonDevice>;
+
+    explicit MotionKey(Button key_) : key(std::move(key_)) {}
+
+    Input::MotionStatus GetStatus() const override {
+
+        if (key->GetStatus()) {
+            return motion.GetRandomMotion(2, 6);
+        }
+        return motion.GetRandomMotion(0, 0);
+    }
+
+private:
+    Button key;
+    InputCommon::MotionInput motion{0.0f, 0.0f, 0.0f};
+};
+
+std::unique_ptr<Input::MotionDevice> MotionFromButton::Create(const Common::ParamPackage& params) {
+    auto key = Input::CreateDevice<Input::ButtonDevice>(params.Serialize());
+    return std::make_unique<MotionKey>(std::move(key));
+}
+
+} // namespace InputCommon

src/input_common/motion_from_button.h

@@ -0,0 +1,25 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/frontend/input.h"
+
+namespace InputCommon {
+
+/**
+ * An motion device factory that takes a keyboard button and uses it as a random
+ * motion device.
+ */
+class MotionFromButton final : public Input::Factory<Input::MotionDevice> {
+public:
+    /**
+     * Creates an motion device from button devices
+     * @param params contains parameters for creating the device:
+     *     - "key": a serialized ParamPackage for creating a button device
+     */
+    std::unique_ptr<Input::MotionDevice> Create(const Common::ParamPackage& params) override;
+};
+
+} // namespace InputCommon

src/input_common/motion_input.cpp

@@ -0,0 +1,301 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included
+
+#include <random>
+#include "common/math_util.h"
+#include "input_common/motion_input.h"
+
+namespace InputCommon {
+
+MotionInput::MotionInput(f32 new_kp, f32 new_ki, f32 new_kd) : kp(new_kp), ki(new_ki), kd(new_kd) {}
+
+void MotionInput::SetAcceleration(const Common::Vec3f& acceleration) {
+    accel = acceleration;
+}
+
+void MotionInput::SetGyroscope(const Common::Vec3f& gyroscope) {
+    gyro = gyroscope - gyro_drift;
+
+    // Auto adjust drift to minimize drift
+    if (!IsMoving(0.1f)) {
+        gyro_drift = (gyro_drift * 0.9999f) + (gyroscope * 0.0001f);
+    }
+
+    if (gyro.Length2() < gyro_threshold) {
+        gyro = {};
+    } else {
+        only_accelerometer = false;
+    }
+}
+
+void MotionInput::SetQuaternion(const Common::Quaternion<f32>& quaternion) {
+    quat = quaternion;
+}
+
+void MotionInput::SetGyroDrift(const Common::Vec3f& drift) {
+    gyro_drift = drift;
+}
+
+void MotionInput::SetGyroThreshold(f32 threshold) {
+    gyro_threshold = threshold;
+}
+
+void MotionInput::EnableReset(bool reset) {
+    reset_enabled = reset;
+}
+
+void MotionInput::ResetRotations() {
+    rotations = {};
+}
+
+bool MotionInput::IsMoving(f32 sensitivity) const {
+    return gyro.Length() >= sensitivity || accel.Length() <= 0.9f || accel.Length() >= 1.1f;
+}
+
+bool MotionInput::IsCalibrated(f32 sensitivity) const {
+    return real_error.Length() < sensitivity;
+}
+
+void MotionInput::UpdateRotation(u64 elapsed_time) {
+    const auto sample_period = static_cast<f32>(elapsed_time) / 1000000.0f;
+    if (sample_period > 0.1f) {
+        return;
+    }
+    rotations += gyro * sample_period;
+}
+
+void MotionInput::UpdateOrientation(u64 elapsed_time) {
+    if (!IsCalibrated(0.1f)) {
+        ResetOrientation();
+    }
+    // Short name local variable for readability
+    f32 q1 = quat.w;
+    f32 q2 = quat.xyz[0];
+    f32 q3 = quat.xyz[1];
+    f32 q4 = quat.xyz[2];
+    const auto sample_period = static_cast<f32>(elapsed_time) / 1000000.0f;
+
+    // Ignore invalid elapsed time
+    if (sample_period > 0.1f) {
+        return;
+    }
+
+    const auto normal_accel = accel.Normalized();
+    auto rad_gyro = gyro * Common::PI * 2;
+    const f32 swap = rad_gyro.x;
+    rad_gyro.x = rad_gyro.y;
+    rad_gyro.y = -swap;
+    rad_gyro.z = -rad_gyro.z;
+
+    // Clear gyro values if there is no gyro present
+    if (only_accelerometer) {
+        rad_gyro.x = 0;
+        rad_gyro.y = 0;
+        rad_gyro.z = 0;
+    }
+
+    // Ignore drift correction if acceleration is not reliable
+    if (accel.Length() >= 0.75f && accel.Length() <= 1.25f) {
+        const f32 ax = -normal_accel.x;
+        const f32 ay = normal_accel.y;
+        const f32 az = -normal_accel.z;
+
+        // Estimated direction of gravity
+        const f32 vx = 2.0f * (q2 * q4 - q1 * q3);
+        const f32 vy = 2.0f * (q1 * q2 + q3 * q4);
+        const f32 vz = q1 * q1 - q2 * q2 - q3 * q3 + q4 * q4;
+
+        // Error is cross product between estimated direction and measured direction of gravity
+        const Common::Vec3f new_real_error = {
+            az * vx - ax * vz,
+            ay * vz - az * vy,
+            ax * vy - ay * vx,
+        };
+
+        derivative_error = new_real_error - real_error;
+        real_error = new_real_error;
+
+        // Prevent integral windup
+        if (ki != 0.0f && !IsCalibrated(0.05f)) {
+            integral_error += real_error;
+        } else {
+            integral_error = {};
+        }
+
+        // Apply feedback terms
+        if (!only_accelerometer) {
+            rad_gyro += kp * real_error;
+            rad_gyro += ki * integral_error;
+            rad_gyro += kd * derivative_error;
+        } else {
+            // Give more weight to acelerometer values to compensate for the lack of gyro
+            rad_gyro += 35.0f * kp * real_error;
+            rad_gyro += 10.0f * ki * integral_error;
+            rad_gyro += 10.0f * kd * derivative_error;
+
+            // Emulate gyro values for games that need them
+            gyro.x = -rad_gyro.y;
+            gyro.y = rad_gyro.x;
+            gyro.z = -rad_gyro.z;
+            UpdateRotation(elapsed_time);
+        }
+    }
+
+    const f32 gx = rad_gyro.y;
+    const f32 gy = rad_gyro.x;
+    const f32 gz = rad_gyro.z;
+
+    // Integrate rate of change of quaternion
+    const f32 pa = q2;
+    const f32 pb = q3;
+    const f32 pc = q4;
+    q1 = q1 + (-q2 * gx - q3 * gy - q4 * gz) * (0.5f * sample_period);
+    q2 = pa + (q1 * gx + pb * gz - pc * gy) * (0.5f * sample_period);
+    q3 = pb + (q1 * gy - pa * gz + pc * gx) * (0.5f * sample_period);
+    q4 = pc + (q1 * gz + pa * gy - pb * gx) * (0.5f * sample_period);
+
+    quat.w = q1;
+    quat.xyz[0] = q2;
+    quat.xyz[1] = q3;
+    quat.xyz[2] = q4;
+    quat = quat.Normalized();
+}
+
+std::array<Common::Vec3f, 3> MotionInput::GetOrientation() const {
+    const Common::Quaternion<float> quad{
+        .xyz = {-quat.xyz[1], -quat.xyz[0], -quat.w},
+        .w = -quat.xyz[2],
+    };
+    const std::array<float, 16> matrix4x4 = quad.ToMatrix();
+
+    return {Common::Vec3f(matrix4x4[0], matrix4x4[1], -matrix4x4[2]),
+            Common::Vec3f(matrix4x4[4], matrix4x4[5], -matrix4x4[6]),
+            Common::Vec3f(-matrix4x4[8], -matrix4x4[9], matrix4x4[10])};
+}
+
+Common::Vec3f MotionInput::GetAcceleration() const {
+    return accel;
+}
+
+Common::Vec3f MotionInput::GetGyroscope() const {
+    return gyro;
+}
+
+Common::Quaternion<f32> MotionInput::GetQuaternion() const {
+    return quat;
+}
+
+Common::Vec3f MotionInput::GetRotations() const {
+    return rotations;
+}
+
+Input::MotionStatus MotionInput::GetMotion() const {
+    const Common::Vec3f gyroscope = GetGyroscope();
+    const Common::Vec3f accelerometer = GetAcceleration();
+    const Common::Vec3f rotation = GetRotations();
+    const std::array<Common::Vec3f, 3> orientation = GetOrientation();
+    return {accelerometer, gyroscope, rotation, orientation};
+}
+
+Input::MotionStatus MotionInput::GetRandomMotion(int accel_magnitude, int gyro_magnitude) const {
+    std::random_device device;
+    std::mt19937 gen(device());
+    std::uniform_int_distribution<s16> distribution(-1000, 1000);
+    const Common::Vec3f gyroscope{
+        static_cast<f32>(distribution(gen)) * 0.001f,
+        static_cast<f32>(distribution(gen)) * 0.001f,
+        static_cast<f32>(distribution(gen)) * 0.001f,
+    };
+    const Common::Vec3f accelerometer{
+        static_cast<f32>(distribution(gen)) * 0.001f,
+        static_cast<f32>(distribution(gen)) * 0.001f,
+        static_cast<f32>(distribution(gen)) * 0.001f,
+    };
+    constexpr Common::Vec3f rotation;
+    constexpr std::array orientation{
+        Common::Vec3f{1.0f, 0.0f, 0.0f},
+        Common::Vec3f{0.0f, 1.0f, 0.0f},
+        Common::Vec3f{0.0f, 0.0f, 1.0f},
+    };
+    return {accelerometer * accel_magnitude, gyroscope * gyro_magnitude, rotation, orientation};
+}
+
+void MotionInput::ResetOrientation() {
+    if (!reset_enabled || only_accelerometer) {
+        return;
+    }
+    if (!IsMoving(0.5f) && accel.z <= -0.9f) {
+        ++reset_counter;
+        if (reset_counter > 900) {
+            quat.w = 0;
+            quat.xyz[0] = 0;
+            quat.xyz[1] = 0;
+            quat.xyz[2] = -1;
+            SetOrientationFromAccelerometer();
+            integral_error = {};
+            reset_counter = 0;
+        }
+    } else {
+        reset_counter = 0;
+    }
+}
+
+void MotionInput::SetOrientationFromAccelerometer() {
+    int iterations = 0;
+    const f32 sample_period = 0.015f;
+
+    const auto normal_accel = accel.Normalized();
+
+    while (!IsCalibrated(0.01f) && ++iterations < 100) {
+        // Short name local variable for readability
+        f32 q1 = quat.w;
+        f32 q2 = quat.xyz[0];
+        f32 q3 = quat.xyz[1];
+        f32 q4 = quat.xyz[2];
+
+        Common::Vec3f rad_gyro;
+        const f32 ax = -normal_accel.x;
+        const f32 ay = normal_accel.y;
+        const f32 az = -normal_accel.z;
+
+        // Estimated direction of gravity
+        const f32 vx = 2.0f * (q2 * q4 - q1 * q3);
+        const f32 vy = 2.0f * (q1 * q2 + q3 * q4);
+        const f32 vz = q1 * q1 - q2 * q2 - q3 * q3 + q4 * q4;
+
+        // Error is cross product between estimated direction and measured direction of gravity
+        const Common::Vec3f new_real_error = {
+            az * vx - ax * vz,
+            ay * vz - az * vy,
+            ax * vy - ay * vx,
+        };
+
+        derivative_error = new_real_error - real_error;
+        real_error = new_real_error;
+
+        rad_gyro += 10.0f * kp * real_error;
+        rad_gyro += 5.0f * ki * integral_error;
+        rad_gyro += 10.0f * kd * derivative_error;
+
+        const f32 gx = rad_gyro.y;
+        const f32 gy = rad_gyro.x;
+        const f32 gz = rad_gyro.z;
+
+        // Integrate rate of change of quaternion
+        const f32 pa = q2;
+        const f32 pb = q3;
+        const f32 pc = q4;
+        q1 = q1 + (-q2 * gx - q3 * gy - q4 * gz) * (0.5f * sample_period);
+        q2 = pa + (q1 * gx + pb * gz - pc * gy) * (0.5f * sample_period);
+        q3 = pb + (q1 * gy - pa * gz + pc * gx) * (0.5f * sample_period);
+        q4 = pc + (q1 * gz + pa * gy - pb * gx) * (0.5f * sample_period);
+
+        quat.w = q1;
+        quat.xyz[0] = q2;
+        quat.xyz[1] = q3;
+        quat.xyz[2] = q4;
+        quat = quat.Normalized();
+    }
+}
+} // namespace InputCommon

src/input_common/motion_input.h

@@ -0,0 +1,74 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included
+
+#pragma once
+
+#include "common/common_types.h"
+#include "common/quaternion.h"
+#include "common/vector_math.h"
+#include "core/frontend/input.h"
+
+namespace InputCommon {
+
+class MotionInput {
+public:
+    explicit MotionInput(f32 new_kp, f32 new_ki, f32 new_kd);
+
+    MotionInput(const MotionInput&) = default;
+    MotionInput& operator=(const MotionInput&) = default;
+
+    MotionInput(MotionInput&&) = default;
+    MotionInput& operator=(MotionInput&&) = default;
+
+    void SetAcceleration(const Common::Vec3f& acceleration);
+    void SetGyroscope(const Common::Vec3f& gyroscope);
+    void SetQuaternion(const Common::Quaternion<f32>& quaternion);
+    void SetGyroDrift(const Common::Vec3f& drift);
+    void SetGyroThreshold(f32 threshold);
+
+    void EnableReset(bool reset);
+    void ResetRotations();
+
+    void UpdateRotation(u64 elapsed_time);
+    void UpdateOrientation(u64 elapsed_time);
+
+    [[nodiscard]] std::array<Common::Vec3f, 3> GetOrientation() const;
+    [[nodiscard]] Common::Vec3f GetAcceleration() const;
+    [[nodiscard]] Common::Vec3f GetGyroscope() const;
+    [[nodiscard]] Common::Vec3f GetRotations() const;
+    [[nodiscard]] Common::Quaternion<f32> GetQuaternion() const;
+    [[nodiscard]] Input::MotionStatus GetMotion() const;
+    [[nodiscard]] Input::MotionStatus GetRandomMotion(int accel_magnitude,
+                                                      int gyro_magnitude) const;
+
+    [[nodiscard]] bool IsMoving(f32 sensitivity) const;
+    [[nodiscard]] bool IsCalibrated(f32 sensitivity) const;
+
+private:
+    void ResetOrientation();
+    void SetOrientationFromAccelerometer();
+
+    // PID constants
+    f32 kp;
+    f32 ki;
+    f32 kd;
+
+    // PID errors
+    Common::Vec3f real_error;
+    Common::Vec3f integral_error;
+    Common::Vec3f derivative_error;
+
+    Common::Quaternion<f32> quat{{0.0f, 0.0f, -1.0f}, 0.0f};
+    Common::Vec3f rotations;
+    Common::Vec3f accel;
+    Common::Vec3f gyro;
+    Common::Vec3f gyro_drift;
+
+    f32 gyro_threshold = 0.0f;
+    u32 reset_counter = 0;
+    bool reset_enabled = true;
+    bool only_accelerometer = true;
+};
+
+} // namespace InputCommon

src/input_common/mouse/mouse_input.cpp

@@ -0,0 +1,129 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "input_common/mouse/mouse_input.h"
+
+namespace MouseInput {
+
+Mouse::Mouse() {
+    update_thread = std::thread(&Mouse::UpdateThread, this);
+}
+
+Mouse::~Mouse() {
+    update_thread_running = false;
+    if (update_thread.joinable()) {
+        update_thread.join();
+    }
+}
+
+void Mouse::UpdateThread() {
+    constexpr int update_time = 10;
+    while (update_thread_running) {
+        for (MouseInfo& info : mouse_info) {
+            const Common::Vec3f angular_direction{
+                -info.tilt_direction.y,
+                0.0f,
+                -info.tilt_direction.x,
+            };
+
+            info.motion.SetGyroscope(angular_direction * info.tilt_speed);
+            info.motion.UpdateRotation(update_time * 1000);
+            info.motion.UpdateOrientation(update_time * 1000);
+            info.tilt_speed = 0;
+            info.data.motion = info.motion.GetMotion();
+        }
+        if (configuring) {
+            UpdateYuzuSettings();
+        }
+        std::this_thread::sleep_for(std::chrono::milliseconds(update_time));
+    }
+}
+
+void Mouse::UpdateYuzuSettings() {
+    if (buttons == 0) {
+        return;
+    }
+
+    mouse_queue.Push(MouseStatus{
+        .button = last_button,
+    });
+}
+
+void Mouse::PressButton(int x, int y, int button_) {
+    const auto button_index = static_cast<std::size_t>(button_);
+    if (button_index >= mouse_info.size()) {
+        return;
+    }
+
+    const auto button = 1U << button_index;
+    buttons |= static_cast<u16>(button);
+    last_button = static_cast<MouseButton>(button_index);
+
+    mouse_info[button_index].mouse_origin = Common::MakeVec(x, y);
+    mouse_info[button_index].last_mouse_position = Common::MakeVec(x, y);
+    mouse_info[button_index].data.pressed = true;
+}
+
+void Mouse::MouseMove(int x, int y) {
+    for (MouseInfo& info : mouse_info) {
+        if (info.data.pressed) {
+            const auto mouse_move = Common::MakeVec(x, y) - info.mouse_origin;
+            const auto mouse_change = Common::MakeVec(x, y) - info.last_mouse_position;
+            info.last_mouse_position = Common::MakeVec(x, y);
+            info.data.axis = {mouse_move.x, -mouse_move.y};
+
+            if (mouse_change.x == 0 && mouse_change.y == 0) {
+                info.tilt_speed = 0;
+            } else {
+                info.tilt_direction = mouse_change.Cast<float>();
+                info.tilt_speed = info.tilt_direction.Normalize() * info.sensitivity;
+            }
+        }
+    }
+}
+
+void Mouse::ReleaseButton(int button_) {
+    const auto button_index = static_cast<std::size_t>(button_);
+    if (button_index >= mouse_info.size()) {
+        return;
+    }
+
+    const auto button = 1U << button_index;
+    buttons &= static_cast<u16>(0xFF - button);
+
+    mouse_info[button_index].tilt_speed = 0;
+    mouse_info[button_index].data.pressed = false;
+    mouse_info[button_index].data.axis = {0, 0};
+}
+
+void Mouse::BeginConfiguration() {
+    buttons = 0;
+    last_button = MouseButton::Undefined;
+    mouse_queue.Clear();
+    configuring = true;
+}
+
+void Mouse::EndConfiguration() {
+    buttons = 0;
+    last_button = MouseButton::Undefined;
+    mouse_queue.Clear();
+    configuring = false;
+}
+
+Common::SPSCQueue<MouseStatus>& Mouse::GetMouseQueue() {
+    return mouse_queue;
+}
+
+const Common::SPSCQueue<MouseStatus>& Mouse::GetMouseQueue() const {
+    return mouse_queue;
+}
+
+MouseData& Mouse::GetMouseState(std::size_t button) {
+    return mouse_info[button].data;
+}
+
+const MouseData& Mouse::GetMouseState(std::size_t button) const {
+    return mouse_info[button].data;
+}
+} // namespace MouseInput

src/input_common/mouse/mouse_input.h

@@ -0,0 +1,98 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <mutex>
+#include <thread>
+
+#include "common/common_types.h"
+#include "common/threadsafe_queue.h"
+#include "common/vector_math.h"
+#include "core/frontend/input.h"
+#include "input_common/motion_input.h"
+
+namespace MouseInput {
+
+enum class MouseButton {
+    Left,
+    Wheel,
+    Right,
+    Foward,
+    Backward,
+    Undefined,
+};
+
+struct MouseStatus {
+    MouseButton button{MouseButton::Undefined};
+};
+
+struct MouseData {
+    bool pressed{};
+    std::array<int, 2> axis{};
+    Input::MotionStatus motion{};
+    Input::TouchStatus touch{};
+};
+
+class Mouse {
+public:
+    Mouse();
+    ~Mouse();
+
+    /// Used for polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    /**
+     * Signals that a button is pressed.
+     * @param x the x-coordinate of the cursor
+     * @param y the y-coordinate of the cursor
+     * @param button_ the button pressed
+     */
+    void PressButton(int x, int y, int button_);
+
+    /**
+     * Signals that mouse has moved.
+     * @param x the x-coordinate of the cursor
+     * @param y the y-coordinate of the cursor
+     */
+    void MouseMove(int x, int y);
+
+    /**
+     * Signals that a motion sensor tilt has ended.
+     */
+    void ReleaseButton(int button_);
+
+    [[nodiscard]] Common::SPSCQueue<MouseStatus>& GetMouseQueue();
+    [[nodiscard]] const Common::SPSCQueue<MouseStatus>& GetMouseQueue() const;
+
+    [[nodiscard]] MouseData& GetMouseState(std::size_t button);
+    [[nodiscard]] const MouseData& GetMouseState(std::size_t button) const;
+
+private:
+    void UpdateThread();
+    void UpdateYuzuSettings();
+
+    struct MouseInfo {
+        InputCommon::MotionInput motion{0.0f, 0.0f, 0.0f};
+        Common::Vec2<int> mouse_origin;
+        Common::Vec2<int> last_mouse_position;
+        bool is_tilting = false;
+        float sensitivity{0.120f};
+
+        float tilt_speed = 0;
+        Common::Vec2<float> tilt_direction;
+        MouseData data;
+    };
+
+    u16 buttons{};
+    std::thread update_thread;
+    MouseButton last_button{MouseButton::Undefined};
+    std::array<MouseInfo, 5> mouse_info;
+    Common::SPSCQueue<MouseStatus> mouse_queue;
+    bool configuring{false};
+    bool update_thread_running{true};
+};
+} // namespace MouseInput

src/input_common/mouse/mouse_poller.cpp

@@ -0,0 +1,274 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <mutex>
+#include <utility>
+
+#include "common/threadsafe_queue.h"
+#include "input_common/mouse/mouse_input.h"
+#include "input_common/mouse/mouse_poller.h"
+
+namespace InputCommon {
+
+class MouseButton final : public Input::ButtonDevice {
+public:
+    explicit MouseButton(u32 button_, const MouseInput::Mouse* mouse_input_)
+        : button(button_), mouse_input(mouse_input_) {}
+
+    bool GetStatus() const override {
+        return mouse_input->GetMouseState(button).pressed;
+    }
+
+private:
+    const u32 button;
+    const MouseInput::Mouse* mouse_input;
+};
+
+MouseButtonFactory::MouseButtonFactory(std::shared_ptr<MouseInput::Mouse> mouse_input_)
+    : mouse_input(std::move(mouse_input_)) {}
+
+std::unique_ptr<Input::ButtonDevice> MouseButtonFactory::Create(
+    const Common::ParamPackage& params) {
+    const auto button_id = params.Get("button", 0);
+
+    return std::make_unique<MouseButton>(button_id, mouse_input.get());
+}
+
+Common::ParamPackage MouseButtonFactory::GetNextInput() const {
+    MouseInput::MouseStatus pad;
+    Common::ParamPackage params;
+    auto& queue = mouse_input->GetMouseQueue();
+    while (queue.Pop(pad)) {
+        // This while loop will break on the earliest detected button
+        if (pad.button != MouseInput::MouseButton::Undefined) {
+            params.Set("engine", "mouse");
+            params.Set("button", static_cast<u16>(pad.button));
+            return params;
+        }
+    }
+    return params;
+}
+
+void MouseButtonFactory::BeginConfiguration() {
+    polling = true;
+    mouse_input->BeginConfiguration();
+}
+
+void MouseButtonFactory::EndConfiguration() {
+    polling = false;
+    mouse_input->EndConfiguration();
+}
+
+class MouseAnalog final : public Input::AnalogDevice {
+public:
+    explicit MouseAnalog(u32 port_, u32 axis_x_, u32 axis_y_, bool invert_x_, bool invert_y_,
+                         float deadzone_, float range_, const MouseInput::Mouse* mouse_input_)
+        : button(port_), axis_x(axis_x_), axis_y(axis_y_), invert_x(invert_x_), invert_y(invert_y_),
+          deadzone(deadzone_), range(range_), mouse_input(mouse_input_) {}
+
+    float GetAxis(u32 axis) const {
+        std::lock_guard lock{mutex};
+        const auto axis_value =
+            static_cast<float>(mouse_input->GetMouseState(button).axis.at(axis));
+        return axis_value / (100.0f * range);
+    }
+
+    std::pair<float, float> GetAnalog(u32 analog_axis_x, u32 analog_axis_y) const {
+        float x = GetAxis(analog_axis_x);
+        float y = GetAxis(analog_axis_y);
+        if (invert_x) {
+            x = -x;
+        }
+        if (invert_y) {
+            y = -y;
+        }
+
+        // Make sure the coordinates are in the unit circle,
+        // otherwise normalize it.
+        float r = x * x + y * y;
+        if (r > 1.0f) {
+            r = std::sqrt(r);
+            x /= r;
+            y /= r;
+        }
+
+        return {x, y};
+    }
+
+    std::tuple<float, float> GetStatus() const override {
+        const auto [x, y] = GetAnalog(axis_x, axis_y);
+        const float r = std::sqrt((x * x) + (y * y));
+        if (r > deadzone) {
+            return {x / r * (r - deadzone) / (1 - deadzone),
+                    y / r * (r - deadzone) / (1 - deadzone)};
+        }
+        return {0.0f, 0.0f};
+    }
+
+private:
+    const u32 button;
+    const u32 axis_x;
+    const u32 axis_y;
+    const bool invert_x;
+    const bool invert_y;
+    const float deadzone;
+    const float range;
+    const MouseInput::Mouse* mouse_input;
+    mutable std::mutex mutex;
+};
+
+/// An analog device factory that creates analog devices from GC Adapter
+MouseAnalogFactory::MouseAnalogFactory(std::shared_ptr<MouseInput::Mouse> mouse_input_)
+    : mouse_input(std::move(mouse_input_)) {}
+
+/**
+ * Creates analog device from joystick axes
+ * @param params contains parameters for creating the device:
+ *     - "port": the nth gcpad on the adapter
+ *     - "axis_x": the index of the axis to be bind as x-axis
+ *     - "axis_y": the index of the axis to be bind as y-axis
+ */
+std::unique_ptr<Input::AnalogDevice> MouseAnalogFactory::Create(
+    const Common::ParamPackage& params) {
+    const auto port = static_cast<u32>(params.Get("port", 0));
+    const auto axis_x = static_cast<u32>(params.Get("axis_x", 0));
+    const auto axis_y = static_cast<u32>(params.Get("axis_y", 1));
+    const auto deadzone = std::clamp(params.Get("deadzone", 0.0f), 0.0f, 1.0f);
+    const auto range = std::clamp(params.Get("range", 1.0f), 0.50f, 1.50f);
+    const std::string invert_x_value = params.Get("invert_x", "+");
+    const std::string invert_y_value = params.Get("invert_y", "+");
+    const bool invert_x = invert_x_value == "-";
+    const bool invert_y = invert_y_value == "-";
+
+    return std::make_unique<MouseAnalog>(port, axis_x, axis_y, invert_x, invert_y, deadzone, range,
+                                         mouse_input.get());
+}
+
+void MouseAnalogFactory::BeginConfiguration() {
+    polling = true;
+    mouse_input->BeginConfiguration();
+}
+
+void MouseAnalogFactory::EndConfiguration() {
+    polling = false;
+    mouse_input->EndConfiguration();
+}
+
+Common::ParamPackage MouseAnalogFactory::GetNextInput() const {
+    MouseInput::MouseStatus pad;
+    Common::ParamPackage params;
+    auto& queue = mouse_input->GetMouseQueue();
+    while (queue.Pop(pad)) {
+        // This while loop will break on the earliest detected button
+        if (pad.button != MouseInput::MouseButton::Undefined) {
+            params.Set("engine", "mouse");
+            params.Set("port", static_cast<u16>(pad.button));
+            params.Set("axis_x", 0);
+            params.Set("axis_y", 1);
+            params.Set("invert_x", "+");
+            params.Set("invert_y", "+");
+            return params;
+        }
+    }
+    return params;
+}
+
+class MouseMotion final : public Input::MotionDevice {
+public:
+    explicit MouseMotion(u32 button_, const MouseInput::Mouse* mouse_input_)
+        : button(button_), mouse_input(mouse_input_) {}
+
+    Input::MotionStatus GetStatus() const override {
+        return mouse_input->GetMouseState(button).motion;
+    }
+
+private:
+    const u32 button;
+    const MouseInput::Mouse* mouse_input;
+};
+
+MouseMotionFactory::MouseMotionFactory(std::shared_ptr<MouseInput::Mouse> mouse_input_)
+    : mouse_input(std::move(mouse_input_)) {}
+
+std::unique_ptr<Input::MotionDevice> MouseMotionFactory::Create(
+    const Common::ParamPackage& params) {
+    const auto button_id = params.Get("button", 0);
+
+    return std::make_unique<MouseMotion>(button_id, mouse_input.get());
+}
+
+Common::ParamPackage MouseMotionFactory::GetNextInput() const {
+    MouseInput::MouseStatus pad;
+    Common::ParamPackage params;
+    auto& queue = mouse_input->GetMouseQueue();
+    while (queue.Pop(pad)) {
+        // This while loop will break on the earliest detected button
+        if (pad.button != MouseInput::MouseButton::Undefined) {
+            params.Set("engine", "mouse");
+            params.Set("button", static_cast<u16>(pad.button));
+            return params;
+        }
+    }
+    return params;
+}
+
+void MouseMotionFactory::BeginConfiguration() {
+    polling = true;
+    mouse_input->BeginConfiguration();
+}
+
+void MouseMotionFactory::EndConfiguration() {
+    polling = false;
+    mouse_input->EndConfiguration();
+}
+
+class MouseTouch final : public Input::TouchDevice {
+public:
+    explicit MouseTouch(u32 button_, const MouseInput::Mouse* mouse_input_)
+        : button(button_), mouse_input(mouse_input_) {}
+
+    Input::TouchStatus GetStatus() const override {
+        return mouse_input->GetMouseState(button).touch;
+    }
+
+private:
+    const u32 button;
+    const MouseInput::Mouse* mouse_input;
+};
+
+MouseTouchFactory::MouseTouchFactory(std::shared_ptr<MouseInput::Mouse> mouse_input_)
+    : mouse_input(std::move(mouse_input_)) {}
+
+std::unique_ptr<Input::TouchDevice> MouseTouchFactory::Create(const Common::ParamPackage& params) {
+    const auto button_id = params.Get("button", 0);
+
+    return std::make_unique<MouseTouch>(button_id, mouse_input.get());
+}
+
+Common::ParamPackage MouseTouchFactory::GetNextInput() const {
+    MouseInput::MouseStatus pad;
+    Common::ParamPackage params;
+    auto& queue = mouse_input->GetMouseQueue();
+    while (queue.Pop(pad)) {
+        // This while loop will break on the earliest detected button
+        if (pad.button != MouseInput::MouseButton::Undefined) {
+            params.Set("engine", "mouse");
+            params.Set("button", static_cast<u16>(pad.button));
+            return params;
+        }
+    }
+    return params;
+}
+
+void MouseTouchFactory::BeginConfiguration() {
+    polling = true;
+    mouse_input->BeginConfiguration();
+}
+
+void MouseTouchFactory::EndConfiguration() {
+    polling = false;
+    mouse_input->EndConfiguration();
+}
+
+} // namespace InputCommon

src/input_common/mouse/mouse_poller.h

@@ -0,0 +1,109 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "core/frontend/input.h"
+#include "input_common/mouse/mouse_input.h"
+
+namespace InputCommon {
+
+/**
+ * A button device factory representing a mouse. It receives mouse events and forward them
+ * to all button devices it created.
+ */
+class MouseButtonFactory final : public Input::Factory<Input::ButtonDevice> {
+public:
+    explicit MouseButtonFactory(std::shared_ptr<MouseInput::Mouse> mouse_input_);
+
+    /**
+     * Creates a button device from a button press
+     * @param params contains parameters for creating the device:
+     *     - "code": the code of the key to bind with the button
+     */
+    std::unique_ptr<Input::ButtonDevice> Create(const Common::ParamPackage& params) override;
+
+    Common::ParamPackage GetNextInput() const;
+
+    /// For device input configuration/polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    bool IsPolling() const {
+        return polling;
+    }
+
+private:
+    std::shared_ptr<MouseInput::Mouse> mouse_input;
+    bool polling = false;
+};
+
+/// An analog device factory that creates analog devices from mouse
+class MouseAnalogFactory final : public Input::Factory<Input::AnalogDevice> {
+public:
+    explicit MouseAnalogFactory(std::shared_ptr<MouseInput::Mouse> mouse_input_);
+
+    std::unique_ptr<Input::AnalogDevice> Create(const Common::ParamPackage& params) override;
+
+    Common::ParamPackage GetNextInput() const;
+
+    /// For device input configuration/polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    bool IsPolling() const {
+        return polling;
+    }
+
+private:
+    std::shared_ptr<MouseInput::Mouse> mouse_input;
+    bool polling = false;
+};
+
+/// A motion device factory that creates motion devices from mouse
+class MouseMotionFactory final : public Input::Factory<Input::MotionDevice> {
+public:
+    explicit MouseMotionFactory(std::shared_ptr<MouseInput::Mouse> mouse_input_);
+
+    std::unique_ptr<Input::MotionDevice> Create(const Common::ParamPackage& params) override;
+
+    Common::ParamPackage GetNextInput() const;
+
+    /// For device input configuration/polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    bool IsPolling() const {
+        return polling;
+    }
+
+private:
+    std::shared_ptr<MouseInput::Mouse> mouse_input;
+    bool polling = false;
+};
+
+/// An touch device factory that creates touch devices from mouse
+class MouseTouchFactory final : public Input::Factory<Input::TouchDevice> {
+public:
+    explicit MouseTouchFactory(std::shared_ptr<MouseInput::Mouse> mouse_input_);
+
+    std::unique_ptr<Input::TouchDevice> Create(const Common::ParamPackage& params) override;
+
+    Common::ParamPackage GetNextInput() const;
+
+    /// For device input configuration/polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    bool IsPolling() const {
+        return polling;
+    }
+
+private:
+    std::shared_ptr<MouseInput::Mouse> mouse_input;
+    bool polling = false;
+};
+
+} // namespace InputCommon

src/input_common/sdl/sdl.cpp

@@ -0,0 +1,19 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "input_common/sdl/sdl.h"
+#ifdef HAVE_SDL2
+#include "input_common/sdl/sdl_impl.h"
+#endif
+
+namespace InputCommon::SDL {
+
+std::unique_ptr<State> Init() {
+#ifdef HAVE_SDL2
+    return std::make_unique<SDLState>();
+#else
+    return std::make_unique<NullState>();
+#endif
+}
+} // namespace InputCommon::SDL

src/input_common/sdl/sdl.h

@@ -0,0 +1,48 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <vector>
+#include "common/param_package.h"
+#include "input_common/main.h"
+
+namespace InputCommon::Polling {
+class DevicePoller;
+enum class DeviceType;
+} // namespace InputCommon::Polling
+
+namespace InputCommon::SDL {
+
+class State {
+public:
+    using Pollers = std::vector<std::unique_ptr<Polling::DevicePoller>>;
+
+    /// Unregisters SDL device factories and shut them down.
+    virtual ~State() = default;
+
+    virtual Pollers GetPollers(Polling::DeviceType) {
+        return {};
+    }
+
+    virtual std::vector<Common::ParamPackage> GetInputDevices() {
+        return {};
+    }
+
+    virtual ButtonMapping GetButtonMappingForDevice(const Common::ParamPackage&) {
+        return {};
+    }
+    virtual AnalogMapping GetAnalogMappingForDevice(const Common::ParamPackage&) {
+        return {};
+    }
+};
+
+class NullState : public State {
+public:
+};
+
+std::unique_ptr<State> Init();
+
+} // namespace InputCommon::SDL

src/input_common/sdl/sdl_impl.h

@@ -0,0 +1,84 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <atomic>
+#include <memory>
+#include <mutex>
+#include <thread>
+#include <unordered_map>
+#include "common/common_types.h"
+#include "common/threadsafe_queue.h"
+#include "input_common/sdl/sdl.h"
+
+union SDL_Event;
+using SDL_Joystick = struct _SDL_Joystick;
+using SDL_JoystickID = s32;
+
+namespace InputCommon::SDL {
+
+class SDLAnalogFactory;
+class SDLButtonFactory;
+class SDLMotionFactory;
+class SDLVibrationFactory;
+class SDLJoystick;
+
+class SDLState : public State {
+public:
+    /// Initializes and registers SDL device factories
+    SDLState();
+
+    /// Unregisters SDL device factories and shut them down.
+    ~SDLState() override;
+
+    /// Handle SDL_Events for joysticks from SDL_PollEvent
+    void HandleGameControllerEvent(const SDL_Event& event);
+
+    /// Get the nth joystick with the corresponding GUID
+    std::shared_ptr<SDLJoystick> GetSDLJoystickBySDLID(SDL_JoystickID sdl_id);
+
+    /**
+     * Check how many identical joysticks (by guid) were connected before the one with sdl_id and so
+     * tie it to a SDLJoystick with the same guid and that port
+     */
+    std::shared_ptr<SDLJoystick> GetSDLJoystickByGUID(const std::string& guid, int port);
+
+    /// Get all DevicePoller that use the SDL backend for a specific device type
+    Pollers GetPollers(Polling::DeviceType type) override;
+
+    /// Used by the Pollers during config
+    std::atomic<bool> polling = false;
+    Common::SPSCQueue<SDL_Event> event_queue;
+
+    std::vector<Common::ParamPackage> GetInputDevices() override;
+
+    ButtonMapping GetButtonMappingForDevice(const Common::ParamPackage& params) override;
+    AnalogMapping GetAnalogMappingForDevice(const Common::ParamPackage& params) override;
+
+private:
+    void InitJoystick(int joystick_index);
+    void CloseJoystick(SDL_Joystick* sdl_joystick);
+
+    /// Needs to be called before SDL_QuitSubSystem.
+    void CloseJoysticks();
+
+    // Set to true if SDL supports game controller subsystem
+    bool has_gamecontroller = false;
+
+    /// Map of GUID of a list of corresponding virtual Joysticks
+    std::unordered_map<std::string, std::vector<std::shared_ptr<SDLJoystick>>> joystick_map;
+    std::mutex joystick_map_mutex;
+
+    std::shared_ptr<SDLButtonFactory> button_factory;
+    std::shared_ptr<SDLAnalogFactory> analog_factory;
+    std::shared_ptr<SDLVibrationFactory> vibration_factory;
+    std::shared_ptr<SDLMotionFactory> motion_factory;
+
+    bool start_thread = false;
+    std::atomic<bool> initialized = false;
+
+    std::thread poll_thread;
+};
+} // namespace InputCommon::SDL

src/input_common/settings.cpp

@@ -0,0 +1,47 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "input_common/settings.h"
+
+namespace Settings {
+namespace NativeButton {
+const std::array<const char*, NumButtons> mapping = {{
+    "button_a",      "button_b",     "button_x",     "button_y",    "button_lstick",
+    "button_rstick", "button_l",     "button_r",     "button_zl",   "button_zr",
+    "button_plus",   "button_minus", "button_dleft", "button_dup",  "button_dright",
+    "button_ddown",  "button_sl",    "button_sr",    "button_home", "button_screenshot",
+}};
+}
+
+namespace NativeAnalog {
+const std::array<const char*, NumAnalogs> mapping = {{
+    "lstick",
+    "rstick",
+}};
+}
+
+namespace NativeVibration {
+const std::array<const char*, NumVibrations> mapping = {{
+    "left_vibration_device",
+    "right_vibration_device",
+}};
+}
+
+namespace NativeMotion {
+const std::array<const char*, NumMotions> mapping = {{
+    "motionleft",
+    "motionright",
+}};
+}
+
+namespace NativeMouseButton {
+const std::array<const char*, NumMouseButtons> mapping = {{
+    "left",
+    "right",
+    "middle",
+    "forward",
+    "back",
+}};
+}
+} // namespace Settings

src/input_common/settings.h

@@ -0,0 +1,371 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <string>
+#include "common/common_types.h"
+
+namespace Settings {
+namespace NativeButton {
+enum Values : int {
+    A,
+    B,
+    X,
+    Y,
+    LStick,
+    RStick,
+    L,
+    R,
+    ZL,
+    ZR,
+    Plus,
+    Minus,
+
+    DLeft,
+    DUp,
+    DRight,
+    DDown,
+
+    SL,
+    SR,
+
+    Home,
+    Screenshot,
+
+    NumButtons,
+};
+
+constexpr int BUTTON_HID_BEGIN = A;
+constexpr int BUTTON_NS_BEGIN = Home;
+
+constexpr int BUTTON_HID_END = BUTTON_NS_BEGIN;
+constexpr int BUTTON_NS_END = NumButtons;
+
+constexpr int NUM_BUTTONS_HID = BUTTON_HID_END - BUTTON_HID_BEGIN;
+constexpr int NUM_BUTTONS_NS = BUTTON_NS_END - BUTTON_NS_BEGIN;
+
+extern const std::array<const char*, NumButtons> mapping;
+
+} // namespace NativeButton
+
+namespace NativeAnalog {
+enum Values : int {
+    LStick,
+    RStick,
+
+    NumAnalogs,
+};
+
+constexpr int STICK_HID_BEGIN = LStick;
+constexpr int STICK_HID_END = NumAnalogs;
+constexpr int NUM_STICKS_HID = NumAnalogs;
+
+extern const std::array<const char*, NumAnalogs> mapping;
+} // namespace NativeAnalog
+
+namespace NativeVibration {
+enum Values : int {
+    LeftVibrationDevice,
+    RightVibrationDevice,
+
+    NumVibrations,
+};
+
+constexpr int VIBRATION_HID_BEGIN = LeftVibrationDevice;
+constexpr int VIBRATION_HID_END = NumVibrations;
+constexpr int NUM_VIBRATIONS_HID = NumVibrations;
+
+extern const std::array<const char*, NumVibrations> mapping;
+}; // namespace NativeVibration
+
+namespace NativeMotion {
+enum Values : int {
+    MotionLeft,
+    MotionRight,
+
+    NumMotions,
+};
+
+constexpr int MOTION_HID_BEGIN = MotionLeft;
+constexpr int MOTION_HID_END = NumMotions;
+constexpr int NUM_MOTIONS_HID = NumMotions;
+
+extern const std::array<const char*, NumMotions> mapping;
+} // namespace NativeMotion
+
+namespace NativeMouseButton {
+enum Values {
+    Left,
+    Right,
+    Middle,
+    Forward,
+    Back,
+
+    NumMouseButtons,
+};
+
+constexpr int MOUSE_HID_BEGIN = Left;
+constexpr int MOUSE_HID_END = NumMouseButtons;
+constexpr int NUM_MOUSE_HID = NumMouseButtons;
+
+extern const std::array<const char*, NumMouseButtons> mapping;
+} // namespace NativeMouseButton
+
+namespace NativeKeyboard {
+enum Keys {
+    None,
+    Error,
+
+    A = 4,
+    B,
+    C,
+    D,
+    E,
+    F,
+    G,
+    H,
+    I,
+    J,
+    K,
+    L,
+    M,
+    N,
+    O,
+    P,
+    Q,
+    R,
+    S,
+    T,
+    U,
+    V,
+    W,
+    X,
+    Y,
+    Z,
+    N1,
+    N2,
+    N3,
+    N4,
+    N5,
+    N6,
+    N7,
+    N8,
+    N9,
+    N0,
+    Enter,
+    Escape,
+    Backspace,
+    Tab,
+    Space,
+    Minus,
+    Equal,
+    LeftBrace,
+    RightBrace,
+    Backslash,
+    Tilde,
+    Semicolon,
+    Apostrophe,
+    Grave,
+    Comma,
+    Dot,
+    Slash,
+    CapsLockKey,
+
+    F1,
+    F2,
+    F3,
+    F4,
+    F5,
+    F6,
+    F7,
+    F8,
+    F9,
+    F10,
+    F11,
+    F12,
+
+    SystemRequest,
+    ScrollLockKey,
+    Pause,
+    Insert,
+    Home,
+    PageUp,
+    Delete,
+    End,
+    PageDown,
+    Right,
+    Left,
+    Down,
+    Up,
+
+    NumLockKey,
+    KPSlash,
+    KPAsterisk,
+    KPMinus,
+    KPPlus,
+    KPEnter,
+    KP1,
+    KP2,
+    KP3,
+    KP4,
+    KP5,
+    KP6,
+    KP7,
+    KP8,
+    KP9,
+    KP0,
+    KPDot,
+
+    Key102,
+    Compose,
+    Power,
+    KPEqual,
+
+    F13,
+    F14,
+    F15,
+    F16,
+    F17,
+    F18,
+    F19,
+    F20,
+    F21,
+    F22,
+    F23,
+    F24,
+
+    Open,
+    Help,
+    Properties,
+    Front,
+    Stop,
+    Repeat,
+    Undo,
+    Cut,
+    Copy,
+    Paste,
+    Find,
+    Mute,
+    VolumeUp,
+    VolumeDown,
+    CapsLockActive,
+    NumLockActive,
+    ScrollLockActive,
+    KPComma,
+
+    KPLeftParenthesis,
+    KPRightParenthesis,
+
+    LeftControlKey = 0xE0,
+    LeftShiftKey,
+    LeftAltKey,
+    LeftMetaKey,
+    RightControlKey,
+    RightShiftKey,
+    RightAltKey,
+    RightMetaKey,
+
+    MediaPlayPause,
+    MediaStopCD,
+    MediaPrevious,
+    MediaNext,
+    MediaEject,
+    MediaVolumeUp,
+    MediaVolumeDown,
+    MediaMute,
+    MediaWebsite,
+    MediaBack,
+    MediaForward,
+    MediaStop,
+    MediaFind,
+    MediaScrollUp,
+    MediaScrollDown,
+    MediaEdit,
+    MediaSleep,
+    MediaCoffee,
+    MediaRefresh,
+    MediaCalculator,
+
+    NumKeyboardKeys,
+};
+
+static_assert(NumKeyboardKeys == 0xFC, "Incorrect number of keyboard keys.");
+
+enum Modifiers {
+    LeftControl,
+    LeftShift,
+    LeftAlt,
+    LeftMeta,
+    RightControl,
+    RightShift,
+    RightAlt,
+    RightMeta,
+    CapsLock,
+    ScrollLock,
+    NumLock,
+
+    NumKeyboardMods,
+};
+
+constexpr int KEYBOARD_KEYS_HID_BEGIN = None;
+constexpr int KEYBOARD_KEYS_HID_END = NumKeyboardKeys;
+constexpr int NUM_KEYBOARD_KEYS_HID = NumKeyboardKeys;
+
+constexpr int KEYBOARD_MODS_HID_BEGIN = LeftControl;
+constexpr int KEYBOARD_MODS_HID_END = NumKeyboardMods;
+constexpr int NUM_KEYBOARD_MODS_HID = NumKeyboardMods;
+
+} // namespace NativeKeyboard
+
+using AnalogsRaw = std::array<std::string, NativeAnalog::NumAnalogs>;
+using ButtonsRaw = std::array<std::string, NativeButton::NumButtons>;
+using MotionsRaw = std::array<std::string, NativeMotion::NumMotions>;
+using VibrationsRaw = std::array<std::string, NativeVibration::NumVibrations>;
+
+using MouseButtonsRaw = std::array<std::string, NativeMouseButton::NumMouseButtons>;
+using KeyboardKeysRaw = std::array<std::string, NativeKeyboard::NumKeyboardKeys>;
+using KeyboardModsRaw = std::array<std::string, NativeKeyboard::NumKeyboardMods>;
+
+constexpr u32 JOYCON_BODY_NEON_RED = 0xFF3C28;
+constexpr u32 JOYCON_BUTTONS_NEON_RED = 0x1E0A0A;
+constexpr u32 JOYCON_BODY_NEON_BLUE = 0x0AB9E6;
+constexpr u32 JOYCON_BUTTONS_NEON_BLUE = 0x001E1E;
+
+enum class ControllerType {
+    ProController,
+    DualJoyconDetached,
+    LeftJoycon,
+    RightJoycon,
+    Handheld,
+};
+
+struct PlayerInput {
+    bool connected;
+    ControllerType controller_type;
+    ButtonsRaw buttons;
+    AnalogsRaw analogs;
+    VibrationsRaw vibrations;
+    MotionsRaw motions;
+
+    bool vibration_enabled;
+    int vibration_strength;
+
+    u32 body_color_left;
+    u32 body_color_right;
+    u32 button_color_left;
+    u32 button_color_right;
+};
+
+struct TouchscreenInput {
+    bool enabled;
+    std::string device;
+
+    u32 finger;
+    u32 diameter_x;
+    u32 diameter_y;
+    u32 rotation_angle;
+};
+} // namespace Settings

src/input_common/touch_from_button.cpp

@@ -0,0 +1,51 @@
+// Copyright 2020 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/frontend/framebuffer_layout.h"
+#include "core/settings.h"
+#include "input_common/touch_from_button.h"
+
+namespace InputCommon {
+
+class TouchFromButtonDevice final : public Input::TouchDevice {
+public:
+    TouchFromButtonDevice() {
+        const auto button_index =
+            static_cast<std::size_t>(Settings::values.touch_from_button_map_index);
+        const auto& buttons = Settings::values.touch_from_button_maps[button_index].buttons;
+
+        for (const auto& config_entry : buttons) {
+            const Common::ParamPackage package{config_entry};
+            map.emplace_back(
+                Input::CreateDevice<Input::ButtonDevice>(config_entry),
+                std::clamp(package.Get("x", 0), 0, static_cast<int>(Layout::ScreenUndocked::Width)),
+                std::clamp(package.Get("y", 0), 0,
+                           static_cast<int>(Layout::ScreenUndocked::Height)));
+        }
+    }
+
+    std::tuple<float, float, bool> GetStatus() const override {
+        for (const auto& m : map) {
+            const bool state = std::get<0>(m)->GetStatus();
+            if (state) {
+                const float x = static_cast<float>(std::get<1>(m)) /
+                                static_cast<int>(Layout::ScreenUndocked::Width);
+                const float y = static_cast<float>(std::get<2>(m)) /
+                                static_cast<int>(Layout::ScreenUndocked::Height);
+                return {x, y, true};
+            }
+        }
+        return {};
+    }
+
+private:
+    // A vector of the mapped button, its x and its y-coordinate
+    std::vector<std::tuple<std::unique_ptr<Input::ButtonDevice>, int, int>> map;
+};
+
+std::unique_ptr<Input::TouchDevice> TouchFromButtonFactory::Create(const Common::ParamPackage&) {
+    return std::make_unique<TouchFromButtonDevice>();
+}
+
+} // namespace InputCommon

src/input_common/touch_from_button.h

@@ -0,0 +1,23 @@
+// Copyright 2020 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "core/frontend/input.h"
+
+namespace InputCommon {
+
+/**
+ * A touch device factory that takes a list of button devices and combines them into a touch device.
+ */
+class TouchFromButtonFactory final : public Input::Factory<Input::TouchDevice> {
+public:
+    /**
+     * Creates a touch device from a list of button devices
+     */
+    std::unique_ptr<Input::TouchDevice> Create(const Common::ParamPackage& params) override;
+};
+
+} // namespace InputCommon

src/input_common/udp/client.cpp

@@ -0,0 +1,465 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <chrono>
+#include <cstring>
+#include <functional>
+#include <thread>
+#include <boost/asio.hpp>
+#include "common/logging/log.h"
+#include "core/settings.h"
+#include "input_common/udp/client.h"
+#include "input_common/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, std::size_t pad_index_, u32 client_id_,
+                    SocketCallback callback_)
+        : callback(std::move(callback_)), timer(io_service),
+          socket(io_service, udp::endpoint(udp::v4(), 0)), client_id(client_id_),
+          pad_index(pad_index_) {
+        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:
+    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{1, {static_cast<u8>(pad_index), 0, 0, 0}};
+        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::Id,
+            static_cast<u8>(pad_index),
+            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;
+
+    u32 client_id{};
+    std::size_t pad_index{};
+
+    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();
+}
+
+Client::Client() {
+    LOG_INFO(Input, "Udp Initialization started");
+    ReloadSockets();
+}
+
+Client::~Client() {
+    Reset();
+}
+
+std::vector<Common::ParamPackage> Client::GetInputDevices() const {
+    std::vector<Common::ParamPackage> devices;
+    for (std::size_t client = 0; client < clients.size(); client++) {
+        if (!DeviceConnected(client)) {
+            continue;
+        }
+        std::string name = fmt::format("UDP Controller {}", client);
+        devices.emplace_back(Common::ParamPackage{
+            {"class", "cemuhookudp"},
+            {"display", std::move(name)},
+            {"port", std::to_string(client)},
+        });
+    }
+    return devices;
+}
+
+bool Client::DeviceConnected(std::size_t client) const {
+    // Use last timestamp to detect if the socket has stopped sending data
+    const auto now = std::chrono::steady_clock::now();
+    const auto time_difference =
+        static_cast<u64>(std::chrono::duration_cast<std::chrono::milliseconds>(
+                             now - clients[client].last_motion_update)
+                             .count());
+    return time_difference < 1000 && clients[client].active == 1;
+}
+
+void Client::ReloadSockets() {
+    Reset();
+
+    std::stringstream servers_ss(Settings::values.udp_input_servers);
+    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;
+        }
+
+        for (std::size_t pad = 0; pad < 4; ++pad) {
+            const std::size_t client_number =
+                GetClientNumber(udp_input_address, udp_input_port, pad);
+            if (client_number != max_udp_clients) {
+                LOG_ERROR(Input, "Duplicated UDP servers found");
+                continue;
+            }
+            StartCommunication(client++, udp_input_address, udp_input_port, pad, 24872);
+        }
+    }
+}
+
+std::size_t Client::GetClientNumber(std::string_view host, u16 port, std::size_t pad) 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 &&
+            clients[client].pad_index == pad) {
+            return client;
+        }
+    }
+    return max_udp_clients;
+}
+
+void Client::OnVersion([[maybe_unused]] Response::Version data) {
+    LOG_TRACE(Input, "Version packet received: {}", data.version);
+}
+
+void Client::OnPortInfo([[maybe_unused]] Response::PortInfo data) {
+    LOG_TRACE(Input, "PortInfo packet received: {}", data.model);
+}
+
+void Client::OnPadData(Response::PadData data, std::size_t client) {
+    LOG_TRACE(Input, "PadData packet received");
+    if (data.packet_counter == clients[client].packet_sequence) {
+        LOG_WARNING(
+            Input,
+            "PadData packet dropped because its stale info. Current count: {} Packet count: {}",
+            clients[client].packet_sequence, data.packet_counter);
+        return;
+    }
+    clients[client].active = static_cast<s8>(data.info.is_pad_active);
+    clients[client].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 - clients[client].last_motion_update)
+                             .count());
+    clients[client].last_motion_update = now;
+    const Common::Vec3f raw_gyroscope = {data.gyro.pitch, data.gyro.roll, -data.gyro.yaw};
+    clients[client].motion.SetAcceleration({data.accel.x, -data.accel.z, data.accel.y});
+    // 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
+    clients[client].motion.SetGyroscope(raw_gyroscope / 312.0f);
+    clients[client].motion.UpdateRotation(time_difference);
+    clients[client].motion.UpdateOrientation(time_difference);
+
+    {
+        std::lock_guard guard(clients[client].status.update_mutex);
+        clients[client].status.motion_status = clients[client].motion.GetMotion();
+
+        // TODO: add a setting for "click" touch. Click touch refers to a device that differentiates
+        // between a simple "tap" and a hard press that causes the touch screen to click.
+        const bool is_active = data.touch_1.is_active != 0;
+
+        float x = 0;
+        float y = 0;
+
+        if (is_active && clients[client].status.touch_calibration) {
+            const u16 min_x = clients[client].status.touch_calibration->min_x;
+            const u16 max_x = clients[client].status.touch_calibration->max_x;
+            const u16 min_y = clients[client].status.touch_calibration->min_y;
+            const u16 max_y = clients[client].status.touch_calibration->max_y;
+
+            x = static_cast<float>(std::clamp(static_cast<u16>(data.touch_1.x), min_x, max_x) -
+                                   min_x) /
+                static_cast<float>(max_x - min_x);
+            y = static_cast<float>(std::clamp(static_cast<u16>(data.touch_1.y), min_y, max_y) -
+                                   min_y) /
+                static_cast<float>(max_y - min_y);
+        }
+
+        clients[client].status.touch_status = {x, y, is_active};
+
+        if (configuring) {
+            const Common::Vec3f gyroscope = clients[client].motion.GetGyroscope();
+            const Common::Vec3f accelerometer = clients[client].motion.GetAcceleration();
+            UpdateYuzuSettings(client, accelerometer, gyroscope, is_active);
+        }
+    }
+}
+
+void Client::StartCommunication(std::size_t client, const std::string& host, u16 port,
+                                std::size_t pad_index, u32 client_id) {
+    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,
+             pad_index);
+    clients[client].host = host;
+    clients[client].port = port;
+    clients[client].pad_index = pad_index;
+    clients[client].active = 0;
+    clients[client].socket = std::make_unique<Socket>(host, port, pad_index, client_id, callback);
+    clients[client].thread = std::thread{SocketLoop, clients[client].socket.get()};
+    // Set motion parameters
+    // SetGyroThreshold value should be dependent on GyroscopeZeroDriftMode
+    // Real HW values are unknown, 0.0001 is an approximate to Standard
+    clients[client].motion.SetGyroThreshold(0.0001f);
+}
+
+void Client::Reset() {
+    for (auto& client : clients) {
+        if (client.thread.joinable()) {
+            client.active = -1;
+            client.socket->Stop();
+            client.thread.join();
+        }
+    }
+}
+
+void Client::UpdateYuzuSettings(std::size_t client, const Common::Vec3<float>& acc,
+                                const Common::Vec3<float>& gyro, bool touch) {
+    if (gyro.Length() > 0.2f) {
+        LOG_DEBUG(Input, "UDP Controller {}: gyro=({}, {}, {}), accel=({}, {}, {}), touch={}",
+                  client, gyro[0], gyro[1], gyro[2], acc[0], acc[1], acc[2], touch);
+    }
+    UDPPadStatus pad{
+        .host = clients[client].host,
+        .port = clients[client].port,
+        .pad_index = clients[client].pad_index,
+    };
+    if (touch) {
+        pad.touch = PadTouch::Click;
+        pad_queue.Push(pad);
+    }
+    for (size_t i = 0; i < 3; ++i) {
+        if (gyro[i] > 5.0f || gyro[i] < -5.0f) {
+            pad.motion = static_cast<PadMotion>(i);
+            pad.motion_value = gyro[i];
+            pad_queue.Push(pad);
+        }
+        if (acc[i] > 1.75f || acc[i] < -1.75f) {
+            pad.motion = static_cast<PadMotion>(i + 3);
+            pad.motion_value = acc[i];
+            pad_queue.Push(pad);
+        }
+    }
+}
+
+void Client::BeginConfiguration() {
+    pad_queue.Clear();
+    configuring = true;
+}
+
+void Client::EndConfiguration() {
+    pad_queue.Clear();
+    configuring = false;
+}
+
+DeviceStatus& Client::GetPadState(const std::string& host, u16 port, std::size_t pad) {
+    const std::size_t client_number = GetClientNumber(host, port, pad);
+    if (client_number == max_udp_clients) {
+        return clients[0].status;
+    }
+    return clients[client_number].status;
+}
+
+const DeviceStatus& Client::GetPadState(const std::string& host, u16 port, std::size_t pad) const {
+    const std::size_t client_number = GetClientNumber(host, port, pad);
+    if (client_number == max_udp_clients) {
+        return clients[0].status;
+    }
+    return clients[client_number].status;
+}
+
+Common::SPSCQueue<UDPPadStatus>& Client::GetPadQueue() {
+    return pad_queue;
+}
+
+const Common::SPSCQueue<UDPPadStatus>& Client::GetPadQueue() const {
+    return pad_queue;
+}
+
+void TestCommunication(const std::string& host, u16 port, std::size_t pad_index, u32 client_id,
+                       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, pad_index, client_id, std::move(callback)};
+        std::thread worker_thread{SocketLoop, &socket};
+        const bool result = success_event.WaitFor(std::chrono::seconds(5));
+        socket.Stop();
+        worker_thread.join();
+        if (result) {
+            success_callback();
+        } else {
+            failure_callback();
+        }
+    }).detach();
+}
+
+CalibrationConfigurationJob::CalibrationConfigurationJob(
+    const std::string& host, u16 port, std::size_t pad_index, u32 client_id,
+    std::function<void(Status)> status_callback,
+    std::function<void(u16, u16, u16, u16)> data_callback) {
+
+    std::thread([=, this] {
+        constexpr u16 CALIBRATION_THRESHOLD = 100;
+
+        u16 min_x{UINT16_MAX};
+        u16 min_y{UINT16_MAX};
+        u16 max_x{};
+        u16 max_y{};
+
+        Status current_status{Status::Initialized};
+        SocketCallback callback{[](Response::Version) {}, [](Response::PortInfo) {},
+                                [&](Response::PadData data) {
+                                    if (current_status == Status::Initialized) {
+                                        // Receiving data means the communication is ready now
+                                        current_status = Status::Ready;
+                                        status_callback(current_status);
+                                    }
+                                    if (data.touch_1.is_active == 0) {
+                                        return;
+                                    }
+                                    LOG_DEBUG(Input, "Current touch: {} {}", data.touch_1.x,
+                                              data.touch_1.y);
+                                    min_x = std::min(min_x, static_cast<u16>(data.touch_1.x));
+                                    min_y = std::min(min_y, static_cast<u16>(data.touch_1.y));
+                                    if (current_status == Status::Ready) {
+                                        // First touch - min data (min_x/min_y)
+                                        current_status = Status::Stage1Completed;
+                                        status_callback(current_status);
+                                    }
+                                    if (data.touch_1.x - min_x > CALIBRATION_THRESHOLD &&
+                                        data.touch_1.y - min_y > CALIBRATION_THRESHOLD) {
+                                        // Set the current position as max value and finishes
+                                        // configuration
+                                        max_x = data.touch_1.x;
+                                        max_y = data.touch_1.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, pad_index, client_id, 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

src/input_common/udp/client.h

@@ -0,0 +1,164 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <optional>
+#include <string>
+#include <thread>
+#include <tuple>
+#include "common/common_types.h"
+#include "common/param_package.h"
+#include "common/thread.h"
+#include "common/threadsafe_queue.h"
+#include "common/vector_math.h"
+#include "core/frontend/input.h"
+#include "input_common/motion_input.h"
+
+namespace InputCommon::CemuhookUDP {
+
+constexpr char DEFAULT_SRV[] = "127.0.0.1:26760";
+
+class Socket;
+
+namespace Response {
+struct PadData;
+struct PortInfo;
+struct Version;
+} // namespace Response
+
+enum class PadMotion {
+    GyroX,
+    GyroY,
+    GyroZ,
+    AccX,
+    AccY,
+    AccZ,
+    Undefined,
+};
+
+enum class PadTouch {
+    Click,
+    Undefined,
+};
+
+struct UDPPadStatus {
+    std::string host{"127.0.0.1"};
+    u16 port{26760};
+    std::size_t pad_index{};
+    PadTouch touch{PadTouch::Undefined};
+    PadMotion motion{PadMotion::Undefined};
+    f32 motion_value{0.0f};
+};
+
+struct DeviceStatus {
+    std::mutex update_mutex;
+    Input::MotionStatus motion_status;
+    std::tuple<float, float, bool> touch_status;
+
+    // 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;
+};
+
+class Client {
+public:
+    // Initialize the UDP client capture and read sequence
+    Client();
+
+    // Close and release the client
+    ~Client();
+
+    // Used for polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    std::vector<Common::ParamPackage> GetInputDevices() const;
+
+    bool DeviceConnected(std::size_t client) const;
+    void ReloadSockets();
+
+    Common::SPSCQueue<UDPPadStatus>& GetPadQueue();
+    const Common::SPSCQueue<UDPPadStatus>& GetPadQueue() const;
+
+    DeviceStatus& GetPadState(const std::string& host, u16 port, std::size_t pad);
+    const DeviceStatus& GetPadState(const std::string& host, u16 port, std::size_t pad) const;
+
+private:
+    struct ClientData {
+        std::string host{"127.0.0.1"};
+        u16 port{26760};
+        std::size_t pad_index{};
+        std::unique_ptr<Socket> socket;
+        DeviceStatus status;
+        std::thread thread;
+        u64 packet_sequence{};
+        s8 active{-1};
+
+        // Realtime values
+        // motion is initalized with PID values for drift correction on joycons
+        InputCommon::MotionInput motion{0.3f, 0.005f, 0.0f};
+        std::chrono::time_point<std::chrono::steady_clock> last_motion_update;
+    };
+
+    // 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, std::size_t pad) 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,
+                            std::size_t pad_index, u32 client_id);
+    void UpdateYuzuSettings(std::size_t client, const Common::Vec3<float>& acc,
+                            const Common::Vec3<float>& gyro, bool touch);
+
+    bool configuring = false;
+
+    // Allocate clients for 8 udp servers
+    const std::size_t max_udp_clients = 32;
+    std::array<ClientData, 4 * 8> clients;
+    Common::SPSCQueue<UDPPadStatus> pad_queue;
+};
+
+/// 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::size_t pad_index,
+                                         u32 client_id, 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, std::size_t pad_index, u32 client_id,
+                       const std::function<void()>& success_callback,
+                       const std::function<void()>& failure_callback);
+
+} // namespace InputCommon::CemuhookUDP

src/input_common/udp/protocol.cpp

@@ -0,0 +1,78 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <cstddef>
+#include <cstring>
+#include "common/logging/log.h"
+#include "input_common/udp/protocol.h"
+
+namespace InputCommon::CemuhookUDP {
+
+static constexpr std::size_t GetSizeOfResponseType(Type t) {
+    switch (t) {
+    case Type::Version:
+        return sizeof(Response::Version);
+    case Type::PortInfo:
+        return sizeof(Response::PortInfo);
+    case Type::PadData:
+        return sizeof(Response::PadData);
+    }
+    return 0;
+}
+
+namespace Response {
+
+/**
+ * Returns Type if the packet is valid, else none
+ *
+ * Note: Modifies the buffer to zero out the crc (since thats the easiest way to check without
+ * copying the buffer)
+ */
+std::optional<Type> Validate(u8* data, std::size_t size) {
+    if (size < sizeof(Header)) {
+        return std::nullopt;
+    }
+    Header header{};
+    std::memcpy(&header, data, sizeof(Header));
+    if (header.magic != SERVER_MAGIC) {
+        LOG_ERROR(Input, "UDP Packet has an unexpected magic value");
+        return std::nullopt;
+    }
+    if (header.protocol_version != PROTOCOL_VERSION) {
+        LOG_ERROR(Input, "UDP Packet protocol mismatch");
+        return std::nullopt;
+    }
+    if (header.type < Type::Version || header.type > Type::PadData) {
+        LOG_ERROR(Input, "UDP Packet is an unknown type");
+        return std::nullopt;
+    }
+
+    // Packet size must equal sizeof(Header) + sizeof(Data)
+    // and also verify that the packet info mentions the correct size. Since the spec includes the
+    // type of the packet as part of the data, we need to include it in size calculations here
+    // ie: payload_length == sizeof(T) + sizeof(Type)
+    const std::size_t data_len = GetSizeOfResponseType(header.type);
+    if (header.payload_length != data_len + sizeof(Type) || size < data_len + sizeof(Header)) {
+        LOG_ERROR(
+            Input,
+            "UDP Packet payload length doesn't match. Received: {} PayloadLength: {} Expected: {}",
+            size, header.payload_length, data_len + sizeof(Type));
+        return std::nullopt;
+    }
+
+    const u32 crc32 = header.crc;
+    boost::crc_32_type result;
+    // zero out the crc in the buffer and then run the crc against it
+    std::memset(&data[offsetof(Header, crc)], 0, sizeof(u32_le));
+
+    result.process_bytes(data, data_len + sizeof(Header));
+    if (crc32 != result.checksum()) {
+        LOG_ERROR(Input, "UDP Packet CRC check failed. Offset: {}", offsetof(Header, crc));
+        return std::nullopt;
+    }
+    return header.type;
+}
+} // namespace Response
+
+} // namespace InputCommon::CemuhookUDP

src/input_common/udp/protocol.h

@@ -0,0 +1,264 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <optional>
+#include <type_traits>
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable : 4701)
+#endif
+#include <boost/crc.hpp>
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
+#include "common/bit_field.h"
+#include "common/swap.h"
+
+namespace InputCommon::CemuhookUDP {
+
+constexpr std::size_t MAX_PACKET_SIZE = 100;
+constexpr u16 PROTOCOL_VERSION = 1001;
+constexpr u32 CLIENT_MAGIC = 0x43555344; // DSUC (but flipped for LE)
+constexpr u32 SERVER_MAGIC = 0x53555344; // DSUS (but flipped for LE)
+
+enum class Type : u32 {
+    Version = 0x00100000,
+    PortInfo = 0x00100001,
+    PadData = 0x00100002,
+};
+
+struct Header {
+    u32_le magic{};
+    u16_le protocol_version{};
+    u16_le payload_length{};
+    u32_le crc{};
+    u32_le id{};
+    ///> In the protocol, the type of the packet is not part of the header, but its convenient to
+    ///> include in the header so the callee doesn't have to duplicate the type twice when building
+    ///> the data
+    Type type{};
+};
+static_assert(sizeof(Header) == 20, "UDP Message Header struct has wrong size");
+static_assert(std::is_trivially_copyable_v<Header>, "UDP Message Header is not trivially copyable");
+
+using MacAddress = std::array<u8, 6>;
+constexpr MacAddress EMPTY_MAC_ADDRESS = {0, 0, 0, 0, 0, 0};
+
+#pragma pack(push, 1)
+template <typename T>
+struct Message {
+    Header header{};
+    T data;
+};
+#pragma pack(pop)
+
+template <typename T>
+constexpr Type GetMessageType();
+
+namespace Request {
+
+struct Version {};
+/**
+ * Requests the server to send information about what controllers are plugged into the ports
+ * In citra's case, we only have one controller, so for simplicity's sake, we can just send a
+ * request explicitly for the first controller port and leave it at that. In the future it would be
+ * nice to make this configurable
+ */
+constexpr u32 MAX_PORTS = 4;
+struct PortInfo {
+    u32_le pad_count{}; ///> Number of ports to request data for
+    std::array<u8, MAX_PORTS> port;
+};
+static_assert(std::is_trivially_copyable_v<PortInfo>,
+              "UDP Request PortInfo is not trivially copyable");
+
+/**
+ * Request the latest pad information from the server. If the server hasn't received this message
+ * from the client in a reasonable time frame, the server will stop sending updates. The default
+ * timeout seems to be 5 seconds.
+ */
+struct PadData {
+    enum class Flags : u8 {
+        AllPorts,
+        Id,
+        Mac,
+    };
+    /// Determines which method will be used as a look up for the controller
+    Flags flags{};
+    /// Index of the port of the controller to retrieve data about
+    u8 port_id{};
+    /// Mac address of the controller to retrieve data about
+    MacAddress mac;
+};
+static_assert(sizeof(PadData) == 8, "UDP Request PadData struct has wrong size");
+static_assert(std::is_trivially_copyable_v<PadData>,
+              "UDP Request PadData is not trivially copyable");
+
+/**
+ * Creates a message with the proper header data that can be sent to the server.
+ * @param data Request body to send
+ * @param client_id ID of the udp client (usually not checked on the server)
+ */
+template <typename T>
+Message<T> Create(const T data, const u32 client_id = 0) {
+    boost::crc_32_type crc;
+    Header header{
+        CLIENT_MAGIC, PROTOCOL_VERSION, sizeof(T) + sizeof(Type), 0, client_id, GetMessageType<T>(),
+    };
+    Message<T> message{header, data};
+    crc.process_bytes(&message, sizeof(Message<T>));
+    message.header.crc = crc.checksum();
+    return message;
+}
+} // namespace Request
+
+namespace Response {
+
+struct Version {
+    u16_le version{};
+};
+static_assert(sizeof(Version) == 2, "UDP Response Version struct has wrong size");
+static_assert(std::is_trivially_copyable_v<Version>,
+              "UDP Response Version is not trivially copyable");
+
+struct PortInfo {
+    u8 id{};
+    u8 state{};
+    u8 model{};
+    u8 connection_type{};
+    MacAddress mac;
+    u8 battery{};
+    u8 is_pad_active{};
+};
+static_assert(sizeof(PortInfo) == 12, "UDP Response PortInfo struct has wrong size");
+static_assert(std::is_trivially_copyable_v<PortInfo>,
+              "UDP Response PortInfo is not trivially copyable");
+
+#pragma pack(push, 1)
+struct PadData {
+    PortInfo info{};
+    u32_le packet_counter{};
+
+    u16_le digital_button{};
+    // The following union isn't trivially copyable but we don't use this input anyway.
+    // union DigitalButton {
+    //     u16_le button;
+    //     BitField<0, 1, u16> button_1;   // Share
+    //     BitField<1, 1, u16> button_2;   // L3
+    //     BitField<2, 1, u16> button_3;   // R3
+    //     BitField<3, 1, u16> button_4;   // Options
+    //     BitField<4, 1, u16> button_5;   // Up
+    //     BitField<5, 1, u16> button_6;   // Right
+    //     BitField<6, 1, u16> button_7;   // Down
+    //     BitField<7, 1, u16> button_8;   // Left
+    //     BitField<8, 1, u16> button_9;   // L2
+    //     BitField<9, 1, u16> button_10;  // R2
+    //     BitField<10, 1, u16> button_11; // L1
+    //     BitField<11, 1, u16> button_12; // R1
+    //     BitField<12, 1, u16> button_13; // Triangle
+    //     BitField<13, 1, u16> button_14; // Circle
+    //     BitField<14, 1, u16> button_15; // Cross
+    //     BitField<15, 1, u16> button_16; // Square
+    // } digital_button;
+
+    u8 home;
+    /// If the device supports a "click" on the touchpad, this will change to 1 when a click happens
+    u8 touch_hard_press{};
+    u8 left_stick_x{};
+    u8 left_stick_y{};
+    u8 right_stick_x{};
+    u8 right_stick_y{};
+
+    struct AnalogButton {
+        u8 button_8{};
+        u8 button_7{};
+        u8 button_6{};
+        u8 button_5{};
+        u8 button_12{};
+        u8 button_11{};
+        u8 button_10{};
+        u8 button_9{};
+        u8 button_16{};
+        u8 button_15{};
+        u8 button_14{};
+        u8 button_13{};
+    } analog_button;
+
+    struct TouchPad {
+        u8 is_active{};
+        u8 id{};
+        u16_le x{};
+        u16_le y{};
+    } touch_1, touch_2;
+
+    u64_le motion_timestamp;
+
+    struct Accelerometer {
+        float x{};
+        float y{};
+        float z{};
+    } accel;
+
+    struct Gyroscope {
+        float pitch{};
+        float yaw{};
+        float roll{};
+    } gyro;
+};
+#pragma pack(pop)
+
+static_assert(sizeof(PadData) == 80, "UDP Response PadData struct has wrong size ");
+static_assert(std::is_trivially_copyable_v<PadData>,
+              "UDP Response PadData is not trivially copyable");
+
+static_assert(sizeof(Message<PadData>) == MAX_PACKET_SIZE,
+              "UDP MAX_PACKET_SIZE is no longer larger than Message<PadData>");
+
+static_assert(sizeof(PadData::AnalogButton) == 12,
+              "UDP Response AnalogButton struct has wrong size ");
+static_assert(sizeof(PadData::TouchPad) == 6, "UDP Response TouchPad struct has wrong size ");
+static_assert(sizeof(PadData::Accelerometer) == 12,
+              "UDP Response Accelerometer struct has wrong size ");
+static_assert(sizeof(PadData::Gyroscope) == 12, "UDP Response Gyroscope struct has wrong size ");
+
+/**
+ * Create a Response Message from the data
+ * @param data array of bytes sent from the server
+ * @return boost::none if it failed to parse or Type if it succeeded. The client can then safely
+ * copy the data into the appropriate struct for that Type
+ */
+std::optional<Type> Validate(u8* data, std::size_t size);
+
+} // namespace Response
+
+template <>
+constexpr Type GetMessageType<Request::Version>() {
+    return Type::Version;
+}
+template <>
+constexpr Type GetMessageType<Request::PortInfo>() {
+    return Type::PortInfo;
+}
+template <>
+constexpr Type GetMessageType<Request::PadData>() {
+    return Type::PadData;
+}
+template <>
+constexpr Type GetMessageType<Response::Version>() {
+    return Type::Version;
+}
+template <>
+constexpr Type GetMessageType<Response::PortInfo>() {
+    return Type::PortInfo;
+}
+template <>
+constexpr Type GetMessageType<Response::PadData>() {
+    return Type::PadData;
+}
+} // namespace InputCommon::CemuhookUDP

src/input_common/udp/udp.cpp

@@ -0,0 +1,138 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <mutex>
+#include <utility>
+#include "common/assert.h"
+#include "common/threadsafe_queue.h"
+#include "input_common/udp/client.h"
+#include "input_common/udp/udp.h"
+
+namespace InputCommon {
+
+class UDPMotion final : public Input::MotionDevice {
+public:
+    explicit UDPMotion(std::string ip_, u16 port_, u16 pad_, CemuhookUDP::Client* client_)
+        : ip(std::move(ip_)), port(port_), pad(pad_), client(client_) {}
+
+    Input::MotionStatus GetStatus() const override {
+        return client->GetPadState(ip, port, pad).motion_status;
+    }
+
+private:
+    const std::string ip;
+    const u16 port;
+    const u16 pad;
+    CemuhookUDP::Client* client;
+    mutable std::mutex mutex;
+};
+
+/// A motion device factory that creates motion devices from JC Adapter
+UDPMotionFactory::UDPMotionFactory(std::shared_ptr<CemuhookUDP::Client> client_)
+    : client(std::move(client_)) {}
+
+/**
+ * Creates motion device
+ * @param params contains parameters for creating the device:
+ *     - "port": the nth jcpad on the adapter
+ */
+std::unique_ptr<Input::MotionDevice> UDPMotionFactory::Create(const Common::ParamPackage& params) {
+    auto ip = params.Get("ip", "127.0.0.1");
+    const auto port = static_cast<u16>(params.Get("port", 26760));
+    const auto pad = static_cast<u16>(params.Get("pad_index", 0));
+
+    return std::make_unique<UDPMotion>(std::move(ip), port, pad, client.get());
+}
+
+void UDPMotionFactory::BeginConfiguration() {
+    polling = true;
+    client->BeginConfiguration();
+}
+
+void UDPMotionFactory::EndConfiguration() {
+    polling = false;
+    client->EndConfiguration();
+}
+
+Common::ParamPackage UDPMotionFactory::GetNextInput() {
+    Common::ParamPackage params;
+    CemuhookUDP::UDPPadStatus pad;
+    auto& queue = client->GetPadQueue();
+    while (queue.Pop(pad)) {
+        if (pad.motion == CemuhookUDP::PadMotion::Undefined || std::abs(pad.motion_value) < 1) {
+            continue;
+        }
+        params.Set("engine", "cemuhookudp");
+        params.Set("ip", pad.host);
+        params.Set("port", static_cast<u16>(pad.port));
+        params.Set("pad_index", static_cast<u16>(pad.pad_index));
+        params.Set("motion", static_cast<u16>(pad.motion));
+        return params;
+    }
+    return params;
+}
+
+class UDPTouch final : public Input::TouchDevice {
+public:
+    explicit UDPTouch(std::string ip_, u16 port_, u16 pad_, CemuhookUDP::Client* client_)
+        : ip(std::move(ip_)), port(port_), pad(pad_), client(client_) {}
+
+    std::tuple<float, float, bool> GetStatus() const override {
+        return client->GetPadState(ip, port, pad).touch_status;
+    }
+
+private:
+    const std::string ip;
+    const u16 port;
+    const u16 pad;
+    CemuhookUDP::Client* client;
+    mutable std::mutex mutex;
+};
+
+/// A motion device factory that creates motion devices from JC Adapter
+UDPTouchFactory::UDPTouchFactory(std::shared_ptr<CemuhookUDP::Client> client_)
+    : client(std::move(client_)) {}
+
+/**
+ * Creates motion device
+ * @param params contains parameters for creating the device:
+ *     - "port": the nth jcpad on the adapter
+ */
+std::unique_ptr<Input::TouchDevice> UDPTouchFactory::Create(const Common::ParamPackage& params) {
+    auto ip = params.Get("ip", "127.0.0.1");
+    const auto port = static_cast<u16>(params.Get("port", 26760));
+    const auto pad = static_cast<u16>(params.Get("pad_index", 0));
+
+    return std::make_unique<UDPTouch>(std::move(ip), port, pad, client.get());
+}
+
+void UDPTouchFactory::BeginConfiguration() {
+    polling = true;
+    client->BeginConfiguration();
+}
+
+void UDPTouchFactory::EndConfiguration() {
+    polling = false;
+    client->EndConfiguration();
+}
+
+Common::ParamPackage UDPTouchFactory::GetNextInput() {
+    Common::ParamPackage params;
+    CemuhookUDP::UDPPadStatus pad;
+    auto& queue = client->GetPadQueue();
+    while (queue.Pop(pad)) {
+        if (pad.touch == CemuhookUDP::PadTouch::Undefined) {
+            continue;
+        }
+        params.Set("engine", "cemuhookudp");
+        params.Set("ip", pad.host);
+        params.Set("port", static_cast<u16>(pad.port));
+        params.Set("pad_index", static_cast<u16>(pad.pad_index));
+        params.Set("touch", static_cast<u16>(pad.touch));
+        return params;
+    }
+    return params;
+}
+
+} // namespace InputCommon

src/input_common/udp/udp.h

@@ -0,0 +1,57 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "core/frontend/input.h"
+#include "input_common/udp/client.h"
+
+namespace InputCommon {
+
+/// A motion device factory that creates motion devices from udp clients
+class UDPMotionFactory final : public Input::Factory<Input::MotionDevice> {
+public:
+    explicit UDPMotionFactory(std::shared_ptr<CemuhookUDP::Client> client_);
+
+    std::unique_ptr<Input::MotionDevice> Create(const Common::ParamPackage& params) override;
+
+    Common::ParamPackage GetNextInput();
+
+    /// For device input configuration/polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    bool IsPolling() const {
+        return polling;
+    }
+
+private:
+    std::shared_ptr<CemuhookUDP::Client> client;
+    bool polling = false;
+};
+
+/// A touch device factory that creates touch devices from udp clients
+class UDPTouchFactory final : public Input::Factory<Input::TouchDevice> {
+public:
+    explicit UDPTouchFactory(std::shared_ptr<CemuhookUDP::Client> client_);
+
+    std::unique_ptr<Input::TouchDevice> Create(const Common::ParamPackage& params) override;
+
+    Common::ParamPackage GetNextInput();
+
+    /// For device input configuration/polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    bool IsPolling() const {
+        return polling;
+    }
+
+private:
+    std::shared_ptr<CemuhookUDP::Client> client;
+    bool polling = false;
+};
+
+} // namespace InputCommon