GC Adapter Implementation

src/core/hle/service/hid/controllers/npad.cpp

@@ -93,7 +93,10 @@ u32 Controller_NPad::IndexToNPad(std::size_t index) {
     };
 }
 
-Controller_NPad::Controller_NPad(Core::System& system) : ControllerBase(system), system(system) {}
+Controller_NPad::Controller_NPad(Core::System& system)
+    : ControllerBase(system), system(system) {
+}
+
 Controller_NPad::~Controller_NPad() = default;
 
 void Controller_NPad::InitNewlyAddedControler(std::size_t controller_idx) {
@@ -194,7 +197,8 @@ void Controller_NPad::OnInit() {
 
     std::transform(
         Settings::values.players.begin(), Settings::values.players.end(),
-        connected_controllers.begin(), [](const Settings::PlayerInput& player) {
+        connected_controllers.begin(), [](const Settings::PlayerInput& player)
+        {
             return ControllerHolder{MapSettingsTypeToNPad(player.type), player.connected};
         });
 
@@ -238,7 +242,8 @@ void Controller_NPad::OnLoadInputDevices() {
     }
 }
 
-void Controller_NPad::OnRelease() {}
+void Controller_NPad::OnRelease() {
+}
 
 void Controller_NPad::RequestPadStateUpdate(u32 npad_id) {
     const auto controller_idx = NPadIdToIndex(npad_id);
@@ -276,16 +281,20 @@ void Controller_NPad::RequestPadStateUpdate(u32 npad_id) {
     pad_state.d_down.Assign(button_state[DDown - BUTTON_HID_BEGIN]->GetStatus());
 
     pad_state.l_stick_right.Assign(
-        analog_state[static_cast<std::size_t>(JoystickId::Joystick_Left)]->GetAnalogDirectionStatus(
+        analog_state[static_cast<std::size_t>(JoystickId::Joystick_Left)]->
+        GetAnalogDirectionStatus(
             Input::AnalogDirection::RIGHT));
     pad_state.l_stick_left.Assign(
-        analog_state[static_cast<std::size_t>(JoystickId::Joystick_Left)]->GetAnalogDirectionStatus(
+        analog_state[static_cast<std::size_t>(JoystickId::Joystick_Left)]->
+        GetAnalogDirectionStatus(
             Input::AnalogDirection::LEFT));
     pad_state.l_stick_up.Assign(
-        analog_state[static_cast<std::size_t>(JoystickId::Joystick_Left)]->GetAnalogDirectionStatus(
+        analog_state[static_cast<std::size_t>(JoystickId::Joystick_Left)]->
+        GetAnalogDirectionStatus(
             Input::AnalogDirection::UP));
     pad_state.l_stick_down.Assign(
-        analog_state[static_cast<std::size_t>(JoystickId::Joystick_Left)]->GetAnalogDirectionStatus(
+        analog_state[static_cast<std::size_t>(JoystickId::Joystick_Left)]->
+        GetAnalogDirectionStatus(
             Input::AnalogDirection::DOWN));
 
     pad_state.r_stick_right.Assign(
@@ -459,7 +468,8 @@ void Controller_NPad::SetSupportedNPadIdTypes(u8* data, std::size_t length) {
             continue;
         }
         const auto requested_controller =
-            i <= MAX_NPAD_ID ? MapSettingsTypeToNPad(Settings::values.players[i].type)
+            i <= MAX_NPAD_ID
+                ? MapSettingsTypeToNPad(Settings::values.players[i].type)
                 : NPadControllerType::Handheld;
         if (!IsControllerSupported(requested_controller)) {
             const auto is_handheld = requested_controller == NPadControllerType::Handheld;

src/input_common/CMakeLists.txt

@@ -7,6 +7,10 @@ add_library(input_common STATIC
     main.h
     motion_emu.cpp
     motion_emu.h
+    gcadapter/gc_adapter.cpp
+    gcadapter/gc_adapter.h
+    gcadapter/gc_poller.cpp
+    gcadapter/gc_poller.h
     sdl/sdl.cpp
     sdl/sdl.h
     udp/client.cpp
@@ -26,5 +30,7 @@ if(SDL2_FOUND)
     target_compile_definitions(input_common PRIVATE HAVE_SDL2)
 endif()
 
+target_link_libraries(input_common PUBLIC ${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

@@ -14,7 +14,8 @@ public:
            float modifier_scale_)
         : 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_scale(modifier_scale_) {
+    }
 
     std::tuple<float, float> GetStatus() const override {
         constexpr float SQRT_HALF = 0.707106781f;

src/input_common/gcadapter/gc_adapter.cpp

@@ -0,0 +1,350 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+//*
+#include "common/logging/log.h"
+#include "common/threadsafe_queue.h"
+#include "input_common/gcadapter/gc_adapter.h"
+
+Common::SPSCQueue<GCPadStatus> pad_queue[4];
+struct GCState state[4];
+
+namespace GCAdapter {
+
+static libusb_device_handle* usb_adapter_handle = nullptr;
+static u8 adapter_controllers_status[4] = {
+    ControllerTypes::CONTROLLER_NONE, ControllerTypes::CONTROLLER_NONE,
+    ControllerTypes::CONTROLLER_NONE, ControllerTypes::CONTROLLER_NONE};
+
+static std::mutex s_mutex;
+
+static std::thread adapter_input_thread;
+static bool adapter_thread_running;
+
+static std::mutex initialization_mutex;
+static std::thread detect_thread;
+static bool detect_thread_running = false;
+
+static libusb_context* libusb_ctx;
+
+static u8 input_endpoint = 0;
+
+static bool configuring = false;
+
+GCPadStatus CheckStatus(int port, u8 adapter_payload[37]) {
+    GCPadStatus pad = {};
+    bool get_origin = false;
+
+    u8 type = adapter_payload[1 + (9 * port)] >> 4;
+    if (type)
+        get_origin = true;
+
+    adapter_controllers_status[port] = type;
+
+    if (adapter_controllers_status[port] != ControllerTypes::CONTROLLER_NONE) {
+        u8 b1 = adapter_payload[1 + (9 * port) + 1];
+        u8 b2 = adapter_payload[1 + (9 * port) + 2];
+
+        if (b1 & (1 << 0))
+            pad.button |= PAD_BUTTON_A;
+        if (b1 & (1 << 1))
+            pad.button |= PAD_BUTTON_B;
+        if (b1 & (1 << 2))
+            pad.button |= PAD_BUTTON_X;
+        if (b1 & (1 << 3))
+            pad.button |= PAD_BUTTON_Y;
+
+        if (b1 & (1 << 4))
+            pad.button |= PAD_BUTTON_LEFT;
+        if (b1 & (1 << 5))
+            pad.button |= PAD_BUTTON_RIGHT;
+        if (b1 & (1 << 6))
+            pad.button |= PAD_BUTTON_DOWN;
+        if (b1 & (1 << 7))
+            pad.button |= PAD_BUTTON_UP;
+
+        if (b2 & (1 << 0))
+            pad.button |= PAD_BUTTON_START;
+        if (b2 & (1 << 1))
+            pad.button |= PAD_TRIGGER_Z;
+        if (b2 & (1 << 2))
+            pad.button |= PAD_TRIGGER_R;
+        if (b2 & (1 << 3))
+            pad.button |= PAD_TRIGGER_L;
+
+        if (get_origin)
+            pad.button |= PAD_GET_ORIGIN;
+
+        pad.stickX = adapter_payload[1 + (9 * port) + 3];
+        pad.stickY = adapter_payload[1 + (9 * port) + 4];
+        pad.substickX = adapter_payload[1 + (9 * port) + 5];
+        pad.substickY = adapter_payload[1 + (9 * port) + 6];
+        pad.triggerLeft = adapter_payload[1 + (9 * port) + 7];
+        pad.triggerRight = adapter_payload[1 + (9 * port) + 8];
+    }
+    return pad;
+}
+
+void PadToState(GCPadStatus pad, GCState& state) {
+    //std::lock_guard lock{s_mutex};
+    state.buttons.insert_or_assign(PAD_BUTTON_A, pad.button & PAD_BUTTON_A);
+    state.buttons.insert_or_assign(PAD_BUTTON_B, pad.button & PAD_BUTTON_B);
+    state.buttons.insert_or_assign(PAD_BUTTON_X, pad.button & PAD_BUTTON_X);
+    state.buttons.insert_or_assign(PAD_BUTTON_Y, pad.button & PAD_BUTTON_Y);
+    state.buttons.insert_or_assign(PAD_BUTTON_LEFT, pad.button & PAD_BUTTON_LEFT);
+    state.buttons.insert_or_assign(PAD_BUTTON_RIGHT, pad.button & PAD_BUTTON_RIGHT);
+    state.buttons.insert_or_assign(PAD_BUTTON_DOWN, pad.button & PAD_BUTTON_DOWN);
+    state.buttons.insert_or_assign(PAD_BUTTON_UP, pad.button & PAD_BUTTON_UP);
+    state.buttons.insert_or_assign(PAD_BUTTON_START, pad.button & PAD_BUTTON_START);
+    state.buttons.insert_or_assign(PAD_TRIGGER_Z, pad.button & PAD_TRIGGER_Z);
+    state.buttons.insert_or_assign(PAD_TRIGGER_L, pad.button & PAD_TRIGGER_L);
+    state.buttons.insert_or_assign(PAD_TRIGGER_R, pad.button & PAD_TRIGGER_R);
+    state.axes.insert_or_assign(STICK_X, pad.stickX);
+    state.axes.insert_or_assign(STICK_Y, pad.stickY);
+    state.axes.insert_or_assign(SUBSTICK_X, pad.substickX);
+    state.axes.insert_or_assign(SUBSTICK_Y, pad.substickY);
+    state.axes.insert_or_assign(TRIGGER_LEFT, pad.triggerLeft);
+    state.axes.insert_or_assign(TRIGGER_RIGHT, pad.triggerRight);
+}
+
+static void Read() {
+    LOG_INFO(Input, "GC Adapter Read() thread started");
+
+    int payload_size_in;
+    u8 adapter_payload[37];
+    while (adapter_thread_running) {
+        libusb_interrupt_transfer(usb_adapter_handle, input_endpoint, adapter_payload,
+                                  sizeof(adapter_payload), &payload_size_in, 32);
+
+        int payload_size = 0;
+        u8 controller_payload_copy[37];
+
+        {
+            std::lock_guard<std::mutex> lk(s_mutex);
+            std::copy(std::begin(adapter_payload), std::end(adapter_payload),
+                      std::begin(controller_payload_copy));
+            payload_size = payload_size_in;
+        }
+        
+        GCPadStatus pad[4];
+        if (payload_size != sizeof(controller_payload_copy) ||
+            controller_payload_copy[0] != LIBUSB_DT_HID) {
+            LOG_ERROR(Input, "error reading payload (size: %d, type: %02x)", payload_size,
+                      controller_payload_copy[0]);
+        } else {
+            for (int i = 0; i < 4; i++)
+                pad[i] = CheckStatus(i, controller_payload_copy);
+        }
+        for (int port = 0; port < 4; port++) {
+            if (DeviceConnected(port) && configuring) {
+                if (pad[port].button != PAD_GET_ORIGIN)
+                    pad_queue[port].Push(pad[port]);
+
+                // Accounting for a threshold here because of some controller variance
+                if (pad[port].stickX > pad[port].MAIN_STICK_CENTER_X + pad[port].THRESHOLD ||
+                    pad[port].stickX < pad[port].MAIN_STICK_CENTER_X - pad[port].THRESHOLD) {
+                    pad[port].axis_which = STICK_X;
+                    pad[port].axis_value = pad[port].stickX;
+                    pad_queue[port].Push(pad[port]);
+                }
+                if (pad[port].stickY > pad[port].MAIN_STICK_CENTER_Y + pad[port].THRESHOLD ||
+                    pad[port].stickY < pad[port].MAIN_STICK_CENTER_Y - pad[port].THRESHOLD) {
+                    pad[port].axis_which = STICK_Y;
+                    pad[port].axis_value = pad[port].stickY;
+                    pad_queue[port].Push(pad[port]);
+                }
+                if (pad[port].substickX > pad[port].C_STICK_CENTER_X + pad[port].THRESHOLD ||
+                    pad[port].substickX < pad[port].C_STICK_CENTER_X - pad[port].THRESHOLD) {
+                    pad[port].axis_which = SUBSTICK_X;
+                    pad[port].axis_value = pad[port].substickX;
+                    pad_queue[port].Push(pad[port]);
+                }
+                if (pad[port].substickY > pad[port].C_STICK_CENTER_Y + pad[port].THRESHOLD ||
+                    pad[port].substickY < pad[port].C_STICK_CENTER_Y - pad[port].THRESHOLD) {
+                    pad[port].axis_which = SUBSTICK_Y;
+                    pad[port].axis_value = pad[port].substickY;
+                    pad_queue[port].Push(pad[port]);
+                }
+            }
+            PadToState(pad[port], state[port]);
+        }
+        std::this_thread::yield();
+    }
+}
+
+static void ScanThreadFunc() {
+    LOG_INFO(Input, "GC Adapter scanning thread started");
+
+    while (detect_thread_running) {
+        if (usb_adapter_handle == nullptr) {
+            std::lock_guard<std::mutex> lk(initialization_mutex);
+            Setup();
+        }
+        Sleep(500);
+    }
+}
+
+void Init() {
+
+    if (usb_adapter_handle != nullptr)
+        return;
+    LOG_INFO(Input, "GC Adapter Initialization started");
+
+    current_status = NO_ADAPTER_DETECTED;
+    libusb_init(&libusb_ctx);
+
+    StartScanThread();
+}
+
+void StartScanThread() {
+    if (detect_thread_running)
+        return;
+    if (!libusb_ctx)
+        return;
+
+    detect_thread_running = true;
+    detect_thread = std::thread(ScanThreadFunc);
+}
+
+void StopScanThread() {
+    detect_thread.join();
+}
+
+static void Setup() {
+    // Reset the error status in case the adapter gets unplugged
+    if (current_status < 0)
+        current_status = NO_ADAPTER_DETECTED;
+
+    for (int i = 0; i < 4; i++)
+        adapter_controllers_status[i] = ControllerTypes::CONTROLLER_NONE;
+    
+    libusb_device** devs; // pointer to list of connected usb devices
+
+    int cnt = libusb_get_device_list(libusb_ctx, &devs); //get the list of devices
+
+    for (int i = 0; i < cnt; i++) {
+        if (CheckDeviceAccess(devs[i])) {
+            // GC Adapter found, registering it
+            GetGCEndpoint(devs[i]);
+            break;
+        }
+    }
+}
+
+static bool CheckDeviceAccess(libusb_device* device) {
+    libusb_device_descriptor desc;
+    int ret = libusb_get_device_descriptor(device, &desc);
+    if (ret) {
+        // could not acquire the descriptor, no point in trying to use it.
+        LOG_ERROR(Input, "libusb_get_device_descriptor failed with error: %d", ret);
+        return false;
+    }
+
+    if (desc.idVendor != 0x057e || desc.idProduct != 0x0337) {
+        // This isn’t the device we are looking for.
+        return false;
+    }
+    ret = libusb_open(device, &usb_adapter_handle);
+
+    if (ret == LIBUSB_ERROR_ACCESS) {
+        LOG_ERROR(Input,
+            "Yuzu can not gain access to this device: ID %04X:%04X.",
+            desc.idVendor, desc.idProduct);
+        return false;
+    }
+    if (ret) {
+        LOG_ERROR(Input, "libusb_open failed to open device with error = %d", ret);
+        return false;
+    }
+
+    ret = libusb_kernel_driver_active(usb_adapter_handle, 0);
+    if (ret == 1) {
+        ret = libusb_detach_kernel_driver(usb_adapter_handle, 0);
+        if (ret != 0 && ret != LIBUSB_ERROR_NOT_SUPPORTED)
+            LOG_ERROR(Input, "libusb_detach_kernel_driver failed with error = %d", ret);
+    }
+
+    if (ret != 0 && ret != LIBUSB_ERROR_NOT_SUPPORTED) {
+        libusb_close(usb_adapter_handle);
+        usb_adapter_handle = nullptr;
+        return false;
+    }
+
+    ret = libusb_claim_interface(usb_adapter_handle, 0);
+    if (ret) {
+        LOG_ERROR(Input, "libusb_claim_interface failed with error = %d", ret);
+        libusb_close(usb_adapter_handle);
+        usb_adapter_handle = nullptr;
+        return false;
+    }
+
+    return true;
+}
+
+static void GetGCEndpoint(libusb_device* device) {
+    libusb_config_descriptor* config = nullptr;
+    libusb_get_config_descriptor(device, 0, &config);
+    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)
+                    input_endpoint = endpoint->bEndpointAddress;
+            }
+        }
+    }
+
+    adapter_thread_running = true;
+    current_status = ADAPTER_DETECTED;
+
+    adapter_input_thread = std::thread(Read); // Read input
+}
+
+void Shutdown() {
+    StopScanThread();
+    Reset();
+
+    current_status = NO_ADAPTER_DETECTED;
+}
+
+static void Reset() {
+    std::unique_lock<std::mutex> lock(initialization_mutex, std::defer_lock);
+    if (!lock.try_lock())
+        return;
+    if (current_status != ADAPTER_DETECTED)
+        return;
+
+    if (adapter_thread_running)
+        adapter_input_thread.join();
+
+    for (int i = 0; i < 4; i++)
+        adapter_controllers_status[i] = ControllerTypes::CONTROLLER_NONE;
+
+    current_status = NO_ADAPTER_DETECTED;
+
+    if (usb_adapter_handle) {
+        libusb_release_interface(usb_adapter_handle, 0);
+        libusb_close(usb_adapter_handle);
+        usb_adapter_handle = nullptr;
+    }
+}
+
+bool DeviceConnected(int port) {
+    return adapter_controllers_status[port] != ControllerTypes::CONTROLLER_NONE;
+}
+
+void ResetDeviceType(int port) {
+    adapter_controllers_status[port] = ControllerTypes::CONTROLLER_NONE;
+}
+
+void BeginConfiguration() {
+    configuring = true;
+}
+
+void EndConfiguration() {
+    configuring = false;
+}
+
+} // end of namespace GCAdapter

src/input_common/gcadapter/gc_adapter.h

@@ -0,0 +1,116 @@
+#pragma once
+#include <algorithm>
+#include <libusb.h>
+#include <mutex>
+#include <functional>
+#include "common/common_types.h"
+
+
+enum {
+    PAD_USE_ORIGIN = 0x0080,
+    PAD_GET_ORIGIN = 0x2000,
+    PAD_ERR_STATUS = 0x8000,
+};
+
+enum PadButton {
+    PAD_BUTTON_LEFT = 0x0001,
+    PAD_BUTTON_RIGHT = 0x0002,
+    PAD_BUTTON_DOWN = 0x0004,
+    PAD_BUTTON_UP = 0x0008,
+    PAD_TRIGGER_Z = 0x0010,
+    PAD_TRIGGER_R = 0x0020,
+    PAD_TRIGGER_L = 0x0040,
+    PAD_BUTTON_A = 0x0100,
+    PAD_BUTTON_B = 0x0200,
+    PAD_BUTTON_X = 0x0400,
+    PAD_BUTTON_Y = 0x0800,
+    PAD_BUTTON_START = 0x1000,
+    // Below is for compatibility with "AxisButton" type
+    PAD_STICK = 0x2000,
+
+};
+
+enum PadAxes { STICK_X, STICK_Y, SUBSTICK_X, SUBSTICK_Y, TRIGGER_LEFT, TRIGGER_RIGHT };
+
+struct GCPadStatus {
+    u16 button;      // Or-ed PAD_BUTTON_* and PAD_TRIGGER_* bits
+    u8 stickX;       // 0 <= stickX       <= 255
+    u8 stickY;       // 0 <= stickY       <= 255
+    u8 substickX;    // 0 <= substickX    <= 255
+    u8 substickY;    // 0 <= substickY    <= 255
+    u8 triggerLeft;  // 0 <= triggerLeft  <= 255
+    u8 triggerRight; // 0 <= triggerRight <= 255
+    bool isConnected{true};
+
+    static const u8 MAIN_STICK_CENTER_X = 0x80;
+    static const u8 MAIN_STICK_CENTER_Y = 0x80;
+    static const u8 MAIN_STICK_RADIUS = 0x7f;
+    static const u8 C_STICK_CENTER_X = 0x80;
+    static const u8 C_STICK_CENTER_Y = 0x80;
+    static const u8 C_STICK_RADIUS = 0x7f;
+
+    static const u8 TRIGGER_CENTER = 20;
+    static const u8 THRESHOLD = 10;
+    u8 port;
+    u8 axis_which = 255;
+    u8 axis_value = 255;
+};
+
+struct GCState {
+    std::unordered_map<int, bool> buttons;
+    std::unordered_map<int, u16> axes;
+};
+
+
+namespace GCAdapter {
+enum ControllerTypes {
+    CONTROLLER_NONE = 0,
+    CONTROLLER_WIRED = 1,
+    CONTROLLER_WIRELESS = 2
+};
+
+enum {
+    NO_ADAPTER_DETECTED = 0,
+    ADAPTER_DETECTED = 1,
+};
+
+// Current adapter status: detected/not detected/in error (holds the error code)
+static int current_status = NO_ADAPTER_DETECTED;
+
+GCPadStatus CheckStatus(int port, u8 adapter_payload[37]);
+/// Initialize the GC Adapter capture and read sequence
+void Init();
+
+/// Close the adapter read thread and release the adapter
+void Shutdown();
+
+/// Begin scanning for the GC Adapter.
+void StartScanThread();
+
+/// Stop scanning for the adapter
+void StopScanThread();
+
+/// Returns true if there is a device connected to port
+bool DeviceConnected(int port);
+
+/// Resets status of device connected to port
+void ResetDeviceType(int port);
+
+/// Returns true if we successfully gain access to GC Adapter
+bool CheckDeviceAccess(libusb_device* device);
+
+/// Captures GC Adapter endpoint address,
+void GetGCEndpoint(libusb_device* device);
+
+/// For shutting down, clear all data, join all threads, release usb
+void Reset();
+
+/// For use in initialization, querying devices to find the adapter
+void Setup();
+
+/// Used for polling
+void BeginConfiguration();
+
+void EndConfiguration();
+
+} // end of namespace GCAdapter

src/input_common/gcadapter/gc_poller.cpp

@@ -0,0 +1,310 @@
+#include <atomic>
+#include <list>
+#include <mutex>
+#include <utility>
+#include "input_common/gcadapter/gc_poller.h"
+#include "input_common/gcadapter/gc_adapter.h"
+#include "common/threadsafe_queue.h"
+
+// Using extern as to avoid multply defined symbols.
+extern Common::SPSCQueue<GCPadStatus> pad_queue[4];
+extern struct GCState state[4];
+
+namespace InputCommon {
+
+class GCButton final : public Input::ButtonDevice {
+public:
+    explicit GCButton(int port_, int button_, int axis_)
+        : port(port_), button(button_) {
+    }
+
+    ~GCButton() override;
+
+    bool GetStatus() const override {
+        return state[port].buttons.at(button);
+    }
+
+private:
+    const int port;
+    const int button;
+};
+
+class GCAxisButton final : public Input::ButtonDevice {
+public:
+    explicit GCAxisButton(int port_, int axis_, float threshold_,
+                          bool trigger_if_greater_)
+        : port(port_), axis(axis_), threshold(threshold_),
+          trigger_if_greater(trigger_if_greater_) {
+    }
+
+
+    bool GetStatus() const override {
+        const float axis_value = (state[port].axes.at(axis) - 128.0f) / 128.0f;
+        if (trigger_if_greater) {
+            return axis_value > 0.10f; //TODO(ameerj) : Fix threshold.
+        }
+        return axis_value < -0.10f;
+    }
+
+private:
+    const int port;
+    const int axis;
+    float threshold;
+    bool trigger_if_greater;
+};
+
+GCButtonFactory::GCButtonFactory() {
+    GCAdapter::Init();
+}
+
+GCButton::~GCButton() {
+    GCAdapter::Shutdown();
+}
+
+std::unique_ptr<Input::ButtonDevice> GCButtonFactory::Create(const Common::ParamPackage& params) {
+    int button_id = params.Get("button", 0);
+    int port = params.Get("port", 0);
+    // For Axis buttons, used by the binary sticks.
+    if (params.Has("axis")) {
+        const int axis = params.Get("axis", 0);
+        const float threshold = params.Get("threshold", 0.5f);
+        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);
+    }
+
+    std::unique_ptr<GCButton> button =
+        std::make_unique<GCButton>(port, button_id, params.Get("axis", 0));
+    return std::move(button);
+}
+
+Common::ParamPackage GCButtonFactory::GetNextInput() {
+    Common::ParamPackage params;
+    GCPadStatus pad;
+    for (int i = 0; i < 4; i++) {
+        while (pad_queue[i].Pop(pad)) {
+            // This while loop will break on the earliest detected button
+            params.Set("engine", "gcpad");
+            params.Set("port", i);
+            // I was debating whether to keep these verbose for ease of reading
+            // or to use a while loop shifting the bits to test and set the value.
+            if (pad.button & PAD_BUTTON_A) {
+                params.Set("button", PAD_BUTTON_A);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_B) {
+                params.Set("button", PAD_BUTTON_B);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_X) {
+                params.Set("button", PAD_BUTTON_X);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_Y) {
+                params.Set("button", PAD_BUTTON_Y);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_DOWN) {
+                params.Set("button", PAD_BUTTON_DOWN);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_LEFT) {
+                params.Set("button", PAD_BUTTON_LEFT);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_RIGHT) {
+                params.Set("button", PAD_BUTTON_RIGHT);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_UP) {
+                params.Set("button", PAD_BUTTON_UP);
+                break;
+            }
+            if (pad.button & PAD_TRIGGER_L) {
+                params.Set("button", PAD_TRIGGER_L);
+                break;
+            }
+            if (pad.button & PAD_TRIGGER_R) {
+                params.Set("button", PAD_TRIGGER_R);
+                break;
+            }
+            if (pad.button & PAD_TRIGGER_Z) {
+                params.Set("button", PAD_TRIGGER_Z);
+                break;
+            }
+            if (pad.button & PAD_BUTTON_START) {
+                params.Set("button", PAD_BUTTON_START);
+                break;
+            }
+            // For Axis button implementation
+            if (pad.axis_which != 255) {
+                params.Set("axis", pad.axis_which);
+                params.Set("button", PAD_STICK);
+                if (pad.axis_value > 128) {
+                    params.Set("direction", "+");
+                    params.Set("threshold", "0.5");
+                } else {
+                    params.Set("direction", "-");
+                    params.Set("threshold", "-0.5");
+                }
+                break;
+            }
+        }
+    }
+    return params;
+}
+
+void GCButtonFactory::BeginConfiguration() {
+    polling = true;
+    for (int i = 0; i < 4; i++)
+        pad_queue[i].Clear();
+    GCAdapter::BeginConfiguration();
+}
+
+void GCButtonFactory::EndConfiguration() {
+    polling = false;
+
+    for (int i = 0; i < 4; i++)
+        pad_queue[i].Clear();
+    GCAdapter::EndConfiguration();
+}
+
+class GCAnalog final : public Input::AnalogDevice {
+public:
+    GCAnalog(int port_, int axis_x_, int axis_y_, float deadzone_)
+        : port(port_), axis_x(axis_x_), axis_y(axis_y_), deadzone(deadzone_) {
+    }
+
+    float GetAxis(int axis) const {
+        std::lock_guard lock{mutex};
+        // division is not by a perfect 128 to account for some variance in center location
+        // e.g. my device idled at 131 in X, 120 in Y, and full range of motion was in range [20-230]
+        return (state[port].axes.at(axis) - 128.0f) / 95.0f;
+    }
+
+    std::tuple<float, float> GetAnalog(int axis_x, int axis_y) const {
+        float x = GetAxis(axis_x);
+        float y = GetAxis(axis_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 std::make_tuple(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 std::make_tuple(x / r * (r - deadzone) / (1 - deadzone),
+                                   y / r * (r - deadzone) / (1 - deadzone));
+        }
+        return std::make_tuple<float, float>(0.0f, 0.0f);
+    }
+
+    bool GetAnalogDirectionStatus(Input::AnalogDirection direction) const override {
+        const auto [x, y] = GetStatus();
+        const float directional_deadzone = 0.4f;
+        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 int port;
+    const int axis_x;
+    const int axis_y;
+    const float deadzone;
+    mutable std::mutex mutex;
+};
+
+
+/// An analog device factory that creates analog devices from GC Adapter
+GCAnalogFactory::GCAnalogFactory() {};
+
+
+/**
+* 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 std::string guid = params.Get("guid", "0");
+    const int port = params.Get("port", 0);
+    const int axis_x = params.Get("axis_x", 0);
+    const int axis_y = params.Get("axis_y", 1);
+    const float deadzone = std::clamp(params.Get("deadzone", 0.0f), 0.0f, .99f);
+
+    return std::make_unique<GCAnalog>(port, axis_x, axis_y, deadzone);
+}
+
+void GCAnalogFactory::BeginConfiguration() {
+    polling = true;
+    for (int i = 0; i < 4; i++)
+        pad_queue[i].Clear();
+    GCAdapter::BeginConfiguration();
+}
+
+void GCAnalogFactory::EndConfiguration() {
+    polling = false;
+    for (int i = 0; i < 4; i++)
+        pad_queue[i].Clear();
+    GCAdapter::EndConfiguration();
+}
+
+Common::ParamPackage GCAnalogFactory::GetNextInput() {
+    GCPadStatus pad;
+    for (int i = 0; i < 4; i++) {
+        while (pad_queue[i].Pop(pad)) {
+            if (pad.axis_which == 255 || std::abs((pad.axis_value - 128.0f) / 128.0f) < 0.1) {
+                continue;
+            }
+            // An analog device needs two axes, so we need to store the axis for later and wait for
+            // a second SDL event. The axes also must be from the same joystick.
+            const int axis = pad.axis_which;
+            if (analog_x_axis == -1) {
+                analog_x_axis = axis;
+                controller_number = i;
+            } else if (analog_y_axis == -1 && analog_x_axis != axis && controller_number == i) {
+                analog_y_axis = axis;
+            }
+        }
+    }
+    Common::ParamPackage params;
+    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);
+        analog_x_axis = -1;
+        analog_y_axis = -1;
+        controller_number = -1;
+        return params;
+    }
+    return params;
+}
+} // namespace InputCommon

src/input_common/gcadapter/gc_poller.h

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <memory>
+#include "core/frontend/input.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:
+    GCButtonFactory();
+
+    /**
+     * 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();
+
+    /// For device input configuration/polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    bool IsPolling() {
+        return polling;
+    }
+
+private:
+    bool polling = false;
+};
+
+/// An analog device factory that creates analog devices from GC Adapter
+class GCAnalogFactory final : public Input::Factory<Input::AnalogDevice> {
+public:
+    GCAnalogFactory();
+    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() {
+        return polling;
+    }
+
+private:
+    int analog_x_axis = -1;
+    int analog_y_axis = -1;
+    int controller_number = -1;
+    bool polling = false;
+};
+} // namespace InputCommon

src/input_common/keyboard.cpp

@@ -13,7 +13,8 @@ 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_)) {}
+        : key_button_list(std::move(key_button_list_)) {
+    }
 
     ~KeyButton() override;
 
@@ -49,8 +50,10 @@ public:
     void ChangeKeyStatus(int key_code, bool pressed) {
         std::lock_guard guard{mutex};
         for (const KeyButtonPair& pair : list) {
-            if (pair.key_code == key_code)
+            if (pair.key_code == key_code) {
                 pair.key_button->status.store(pressed);
+                break;
+            }
         }
     }
 
@@ -66,7 +69,9 @@ private:
     std::list<KeyButtonPair> list;
 };
 
-Keyboard::Keyboard() : key_button_list{std::make_shared<KeyButtonList>()} {}
+Keyboard::Keyboard()
+    : key_button_list{std::make_shared<KeyButtonList>()} {
+}
 
 KeyButton::~KeyButton() {
     key_button_list->RemoveKeyButton(this);
@@ -76,7 +81,7 @@ std::unique_ptr<Input::ButtonDevice> Keyboard::Create(const Common::ParamPackage
     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;
+    return std::move(button);
 }
 
 void Keyboard::PressKey(int key_code) {

src/input_common/main.cpp

@@ -4,8 +4,11 @@
 
 #include <memory>
 #include <thread>
+#include <libusb.h>
+#include <iostream>
 #include "common/param_package.h"
 #include "input_common/analog_from_button.h"
+#include "input_common/gcadapter/gc_poller.h"
 #include "input_common/keyboard.h"
 #include "input_common/main.h"
 #include "input_common/motion_emu.h"
@@ -22,8 +25,15 @@ static std::shared_ptr<MotionEmu> motion_emu;
 static std::unique_ptr<SDL::State> sdl;
 #endif
 static std::unique_ptr<CemuhookUDP::State> udp;
+static std::shared_ptr<GCButtonFactory> gcbuttons;
+static std::shared_ptr<GCAnalogFactory> gcanalog;
 
 void Init() {
+    gcbuttons = std::make_shared<GCButtonFactory>();
+    Input::RegisterFactory<Input::ButtonDevice>("gcpad", gcbuttons);
+    gcanalog = std::make_shared<GCAnalogFactory>();
+    Input::RegisterFactory<Input::AnalogDevice>("gcpad", gcanalog);
+
     keyboard = std::make_shared<Keyboard>();
     Input::RegisterFactory<Input::ButtonDevice>("keyboard", keyboard);
     Input::RegisterFactory<Input::AnalogDevice>("analog_from_button",
@@ -34,8 +44,10 @@ void Init() {
 #ifdef HAVE_SDL2
     sdl = SDL::Init();
 #endif
+    /*
 
     udp = CemuhookUDP::Init();
+    */
 }
 
 void Shutdown() {
@@ -48,6 +60,8 @@ void Shutdown() {
     sdl.reset();
 #endif
     udp.reset();
+    Input::UnregisterFactory<Input::ButtonDevice>("gcpad");
+    gcbuttons.reset();
 }
 
 Keyboard* GetKeyboard() {
@@ -58,6 +72,14 @@ MotionEmu* GetMotionEmu() {
     return motion_emu.get();
 }
 
+GCButtonFactory* GetGCButtons() {
+    return gcbuttons.get();
+}
+
+GCAnalogFactory* GetGCAnalogs() {
+    return gcanalog.get();
+}
+
 std::string GenerateKeyboardParam(int key_code) {
     Common::ParamPackage param{
         {"engine", "keyboard"},
@@ -88,7 +110,6 @@ std::vector<std::unique_ptr<DevicePoller>> GetPollers(DeviceType type) {
 #ifdef HAVE_SDL2
     pollers = sdl->GetPollers(type);
 #endif
-
     return pollers;
 }
 

src/input_common/main.h

@@ -7,6 +7,8 @@
 #include <memory>
 #include <string>
 #include <vector>
+#include "input_common/gcadapter/gc_poller.h"
+#include "input_common/gcadapter/gc_adapter.h"
 
 namespace Common {
 class ParamPackage;
@@ -30,6 +32,13 @@ class MotionEmu;
 /// Gets the motion emulation factory.
 MotionEmu* GetMotionEmu();
 
+class GCButtonFactory;
+class GCAnalogFactory;
+
+GCButtonFactory* GetGCButtons();
+GCAnalogFactory* GetGCAnalogs();
+
+
 /// Generates a serialized param package for creating a keyboard button device
 std::string GenerateKeyboardParam(int key_code);
 

src/input_common/motion_emu.cpp

@@ -22,7 +22,8 @@ public:
         : update_millisecond(update_millisecond),
           update_duration(std::chrono::duration_cast<std::chrono::steady_clock::duration>(
               std::chrono::milliseconds(update_millisecond))),
-          sensitivity(sensitivity), motion_emu_thread(&MotionEmuDevice::MotionEmuThread, this) {}
+          sensitivity(sensitivity), motion_emu_thread(&MotionEmuDevice::MotionEmuThread, this) {
+    }
 
     ~MotionEmuDevice() {
         if (motion_emu_thread.joinable()) {
@@ -145,7 +146,7 @@ std::unique_ptr<Input::MotionDevice> MotionEmu::Create(const Common::ParamPackag
     // Previously created device is disconnected here. Having two motion devices for 3DS is not
     // expected.
     current_device = device_wrapper->device;
-    return device_wrapper;
+    return std::move(device_wrapper);
 }
 
 void MotionEmu::BeginTilt(int x, int y) {

src/input_common/sdl/sdl_impl.cpp

@@ -49,7 +49,8 @@ static int SDLEventWatcher(void* user_data, SDL_Event* event) {
 class SDLJoystick {
 public:
     SDLJoystick(std::string guid_, int port_, SDL_Joystick* joystick)
-        : guid{std::move(guid_)}, port{port_}, sdl_joystick{joystick, &SDL_JoystickClose} {}
+        : guid{std::move(guid_)}, port{port_}, sdl_joystick{joystick, &SDL_JoystickClose} {
+    }
 
     void SetButton(int button, bool value) {
         std::lock_guard lock{mutex};
@@ -97,6 +98,7 @@ public:
         std::lock_guard lock{mutex};
         return (state.hats.at(hat) & direction) != 0;
     }
+
     /**
      * The guid of the joystick
      */
@@ -125,6 +127,7 @@ private:
         std::unordered_map<int, Sint16> axes;
         std::unordered_map<int, Uint8> hats;
     } state;
+
     std::string guid;
     int port;
     std::unique_ptr<SDL_Joystick, decltype(&SDL_JoystickClose)> sdl_joystick;
@@ -155,7 +158,8 @@ std::shared_ptr<SDLJoystick> SDLState::GetSDLJoystickBySDLID(SDL_JoystickID sdl_
     if (map_it != joystick_map.end()) {
         const auto vec_it =
             std::find_if(map_it->second.begin(), map_it->second.end(),
-                         [&sdl_joystick](const std::shared_ptr<SDLJoystick>& joystick) {
+                         [&sdl_joystick](const std::shared_ptr<SDLJoystick>& joystick)
+                         {
                              return sdl_joystick == joystick->GetSDLJoystick();
                          });
         if (vec_it != map_it->second.end()) {
@@ -166,7 +170,8 @@ std::shared_ptr<SDLJoystick> SDLState::GetSDLJoystickBySDLID(SDL_JoystickID sdl_
 
         // Search for a SDLJoystick without a mapped SDL_Joystick...
         const auto nullptr_it = std::find_if(map_it->second.begin(), map_it->second.end(),
-                                             [](const std::shared_ptr<SDLJoystick>& joystick) {
+                                             [](const std::shared_ptr<SDLJoystick>& joystick)
+                                             {
                                                  return !joystick->GetSDLJoystick();
                                              });
         if (nullptr_it != map_it->second.end()) {
@@ -223,7 +228,8 @@ void SDLState::CloseJoystick(SDL_Joystick* sdl_joystick) {
         const auto& joystick_guid_list = joystick_map[guid];
         const auto joystick_it =
             std::find_if(joystick_guid_list.begin(), joystick_guid_list.end(),
-                         [&sdl_joystick](const std::shared_ptr<SDLJoystick>& joystick) {
+                         [&sdl_joystick](const std::shared_ptr<SDLJoystick>& joystick)
+                         {
                              return joystick->GetSDLJoystick() == sdl_joystick;
                          });
         joystick = *joystick_it;
@@ -279,7 +285,8 @@ void SDLState::CloseJoysticks() {
 class SDLButton final : public Input::ButtonDevice {
 public:
     explicit SDLButton(std::shared_ptr<SDLJoystick> joystick_, int button_)
-        : joystick(std::move(joystick_)), button(button_) {}
+        : joystick(std::move(joystick_)), button(button_) {
+    }
 
     bool GetStatus() const override {
         return joystick->GetButton(button);
@@ -293,7 +300,8 @@ private:
 class SDLDirectionButton final : public Input::ButtonDevice {
 public:
     explicit SDLDirectionButton(std::shared_ptr<SDLJoystick> joystick_, int hat_, Uint8 direction_)
-        : joystick(std::move(joystick_)), hat(hat_), direction(direction_) {}
+        : joystick(std::move(joystick_)), hat(hat_), direction(direction_) {
+    }
 
     bool GetStatus() const override {
         return joystick->GetHatDirection(hat, direction);
@@ -310,7 +318,8 @@ public:
     explicit SDLAxisButton(std::shared_ptr<SDLJoystick> joystick_, int axis_, float threshold_,
                            bool trigger_if_greater_)
         : joystick(std::move(joystick_)), axis(axis_), threshold(threshold_),
-          trigger_if_greater(trigger_if_greater_) {}
+          trigger_if_greater(trigger_if_greater_) {
+    }
 
     bool GetStatus() const override {
         const float axis_value = joystick->GetAxis(axis);
@@ -330,7 +339,8 @@ private:
 class SDLAnalog final : public Input::AnalogDevice {
 public:
     SDLAnalog(std::shared_ptr<SDLJoystick> joystick_, int axis_x_, int axis_y_, float deadzone_)
-        : joystick(std::move(joystick_)), axis_x(axis_x_), axis_y(axis_y_), deadzone(deadzone_) {}
+        : joystick(std::move(joystick_)), axis_x(axis_x_), axis_y(axis_y_), deadzone(deadzone_) {
+    }
 
     std::tuple<float, float> GetStatus() const override {
         const auto [x, y] = joystick->GetAnalog(axis_x, axis_y);
@@ -368,7 +378,9 @@ private:
 /// A button device factory that creates button devices from SDL joystick
 class SDLButtonFactory final : public Input::Factory<Input::ButtonDevice> {
 public:
-    explicit SDLButtonFactory(SDLState& state_) : state(state_) {}
+    explicit SDLButtonFactory(SDLState& state_)
+        : state(state_) {
+    }
 
     /**
      * Creates a button device from a joystick button
@@ -443,7 +455,10 @@ private:
 /// An analog device factory that creates analog devices from SDL joystick
 class SDLAnalogFactory final : public Input::Factory<Input::AnalogDevice> {
 public:
-    explicit SDLAnalogFactory(SDLState& state_) : state(state_) {}
+    explicit SDLAnalogFactory(SDLState& state_)
+        : state(state_) {
+    }
+
     /**
      * Creates analog device from joystick axes
      * @param params contains parameters for creating the device:
@@ -490,7 +505,8 @@ SDLState::SDLState() {
 
     initialized = true;
     if (start_thread) {
-        poll_thread = std::thread([this] {
+        poll_thread = std::thread([this]
+        {
             using namespace std::chrono_literals;
             while (initialized) {
                 SDL_PumpEvents();
@@ -576,7 +592,9 @@ namespace Polling {
 
 class SDLPoller : public InputCommon::Polling::DevicePoller {
 public:
-    explicit SDLPoller(SDLState& state_) : state(state_) {}
+    explicit SDLPoller(SDLState& state_)
+        : state(state_) {
+    }
 
     void Start() override {
         state.event_queue.Clear();
@@ -593,7 +611,9 @@ protected:
 
 class SDLButtonPoller final : public SDLPoller {
 public:
-    explicit SDLButtonPoller(SDLState& state_) : SDLPoller(state_) {}
+    explicit SDLButtonPoller(SDLState& state_)
+        : SDLPoller(state_) {
+    }
 
     Common::ParamPackage GetNextInput() override {
         SDL_Event event;
@@ -602,8 +622,7 @@ public:
             case SDL_JOYAXISMOTION:
                 if (std::abs(event.jaxis.value / 32767.0) < 0.5) {
                     break;
-                }
-                [[fallthrough]];
+                }[[fallthrough]];
             case SDL_JOYBUTTONUP:
             case SDL_JOYHATMOTION:
                 return SDLEventToButtonParamPackage(state, event);
@@ -615,7 +634,9 @@ public:
 
 class SDLAnalogPoller final : public SDLPoller {
 public:
-    explicit SDLAnalogPoller(SDLState& state_) : SDLPoller(state_) {}
+    explicit SDLAnalogPoller(SDLState& state_)
+        : SDLPoller(state_) {
+    }
 
     void Start() override {
         SDLPoller::Start();

src/input_common/udp/client.cpp

@@ -59,7 +59,8 @@ public:
     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) {
+            [this](const boost::system::error_code& error, std::size_t bytes_transferred)
+            {
                 HandleReceive(error, bytes_transferred);
             });
     }
@@ -211,9 +212,15 @@ void Client::StartCommunication(const std::string& host, u16 port, u8 pad_index,
 void TestCommunication(const std::string& host, u16 port, u8 pad_index, u32 client_id,
                        std::function<void()> success_callback,
                        std::function<void()> failure_callback) {
-    std::thread([=] {
+    std::thread([=]
+        {
             Common::Event success_event;
-        SocketCallback callback{[](Response::Version version) {}, [](Response::PortInfo info) {},
+            SocketCallback callback{[](Response::Version version)
+                                    {
+                                    },
+                                    [](Response::PortInfo info)
+                                    {
+                                    },
                                     [&](Response::PadData data) { success_event.Set(); }};
             Socket socket{host, port, pad_index, client_id, std::move(callback)};
             std::thread worker_thread{SocketLoop, &socket};
@@ -234,7 +241,8 @@ CalibrationConfigurationJob::CalibrationConfigurationJob(
     std::function<void(Status)> status_callback,
     std::function<void(u16, u16, u16, u16)> data_callback) {
 
-    std::thread([=] {
+    std::thread([=]
+        {
             constexpr u16 CALIBRATION_THRESHOLD = 100;
 
             u16 min_x{UINT16_MAX};
@@ -243,8 +251,14 @@ CalibrationConfigurationJob::CalibrationConfigurationJob(
             u16 max_y{};
 
             Status current_status{Status::Initialized};
-        SocketCallback callback{[](Response::Version version) {}, [](Response::PortInfo info) {},
-                                [&](Response::PadData data) {
+            SocketCallback callback{[](Response::Version version)
+                                    {
+                                    },
+                                    [](Response::PortInfo info)
+                                    {
+                                    },
+                                    [&](Response::PadData data)
+                                    {
                                         if (current_status == Status::Initialized) {
                                             // Receiving data means the communication is ready now
                                             current_status = Status::Ready;

src/input_common/udp/client.h

@@ -40,6 +40,7 @@ struct DeviceStatus {
         u16 max_x{};
         u16 max_y{};
     };
+
     std::optional<CalibrationData> touch_calibration;
 };
 
@@ -72,6 +73,7 @@ public:
         Stage1Completed,
         Completed,
     };
+
     /**
      * Constructs and starts the job with the specified parameter.
      *

src/input_common/udp/protocol.h

@@ -35,6 +35,7 @@ struct Header {
     ///> 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");
 
@@ -54,7 +55,9 @@ constexpr Type GetMessageType();
 
 namespace Request {
 
-struct Version {};
+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
@@ -62,10 +65,12 @@ struct Version {};
  * 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");
 
@@ -80,6 +85,7 @@ struct PadData {
         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
@@ -87,6 +93,7 @@ struct PadData {
     /// 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");
@@ -114,6 +121,7 @@ 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");
@@ -127,6 +135,7 @@ struct PortInfo {
     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");
@@ -232,22 +241,27 @@ 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;

src/input_common/udp/udp.cpp

@@ -16,7 +16,10 @@ namespace InputCommon::CemuhookUDP {
 
 class UDPTouchDevice final : public Input::TouchDevice {
 public:
-    explicit UDPTouchDevice(std::shared_ptr<DeviceStatus> status_) : status(std::move(status_)) {}
+    explicit UDPTouchDevice(std::shared_ptr<DeviceStatus> status_)
+        : status(std::move(status_)) {
+    }
+
     std::tuple<float, float, bool> GetStatus() const override {
         std::lock_guard guard(status->update_mutex);
         return status->touch_status;
@@ -28,7 +31,10 @@ private:
 
 class UDPMotionDevice final : public Input::MotionDevice {
 public:
-    explicit UDPMotionDevice(std::shared_ptr<DeviceStatus> status_) : status(std::move(status_)) {}
+    explicit UDPMotionDevice(std::shared_ptr<DeviceStatus> status_)
+        : status(std::move(status_)) {
+    }
+
     std::tuple<Common::Vec3<float>, Common::Vec3<float>> GetStatus() const override {
         std::lock_guard guard(status->update_mutex);
         return status->motion_status;
@@ -40,7 +46,9 @@ private:
 
 class UDPTouchFactory final : public Input::Factory<Input::TouchDevice> {
 public:
-    explicit UDPTouchFactory(std::shared_ptr<DeviceStatus> status_) : status(std::move(status_)) {}
+    explicit UDPTouchFactory(std::shared_ptr<DeviceStatus> status_)
+        : status(std::move(status_)) {
+    }
 
     std::unique_ptr<Input::TouchDevice> Create(const Common::ParamPackage& params) override {
         {
@@ -61,7 +69,9 @@ private:
 
 class UDPMotionFactory final : public Input::Factory<Input::MotionDevice> {
 public:
-    explicit UDPMotionFactory(std::shared_ptr<DeviceStatus> status_) : status(std::move(status_)) {}
+    explicit UDPMotionFactory(std::shared_ptr<DeviceStatus> status_)
+        : status(std::move(status_)) {
+    }
 
     std::unique_ptr<Input::MotionDevice> Create(const Common::ParamPackage& params) override {
         return std::make_unique<UDPMotionDevice>(status);

src/yuzu/configuration/configure_input_player.cpp

@@ -70,6 +70,20 @@ static QString ButtonToText(const Common::ParamPackage& param) {
         return GetKeyName(param.Get("code", 0));
     }
 
+    if (param.Get("engine", "") == "gcpad") {
+        if (param.Has("axis")) {
+            const QString axis_str = QString::fromStdString(param.Get("axis", ""));
+            const QString direction_str = QString::fromStdString(param.Get("direction", ""));
+
+            return QObject::tr("Axis %1%2").arg(axis_str, direction_str);
+        }
+        if (param.Has("button")) {
+            const QString button_str = QString::number(int(std::log2(param.Get("button", 0))));
+            return QObject::tr("Button %1").arg(button_str);
+        }
+        return GetKeyName(param.Get("code", 0));
+    }
+
     if (param.Get("engine", "") == "sdl") {
         if (param.Has("hat")) {
             const QString hat_str = QString::fromStdString(param.Get("hat", ""));
@@ -106,7 +120,7 @@ static QString AnalogToText(const Common::ParamPackage& param, const std::string
         return ButtonToText(Common::ParamPackage{param.Get(dir, "")});
     }
 
-    if (param.Get("engine", "") == "sdl") {
+    if (param.Get("engine", "") == "sdl" || param.Get("engine", "") == "gcpad") {
         if (dir == "modifier") {
             return QObject::tr("[unused]");
         }
@@ -247,9 +261,11 @@ ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, std::size_t player_i
         }
 
         button->setContextMenuPolicy(Qt::CustomContextMenu);
-        connect(button, &QPushButton::clicked, [=] {
+        connect(button, &QPushButton::clicked, [=]
+        {
             HandleClick(button_map[button_id],
-                        [=](Common::ParamPackage params) {
+                        [=](Common::ParamPackage params)
+                        {
                             // Workaround for ZL & ZR for analog triggers like on XBOX controllors.
                             // Analog triggers (from controllers like the XBOX controller) would not
                             // work due to a different range of their signals (from 0 to 255 on
@@ -267,13 +283,16 @@ ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, std::size_t player_i
                         },
                         InputCommon::Polling::DeviceType::Button);
         });
-        connect(button, &QPushButton::customContextMenuRequested, [=](const QPoint& menu_location) {
+        connect(button, &QPushButton::customContextMenuRequested, [=](const QPoint& menu_location)
+        {
             QMenu context_menu;
-            context_menu.addAction(tr("Clear"), [&] {
+            context_menu.addAction(tr("Clear"), [&]
+            {
                 buttons_param[button_id].Clear();
                 button_map[button_id]->setText(tr("[not set]"));
             });
-            context_menu.addAction(tr("Restore Default"), [&] {
+            context_menu.addAction(tr("Restore Default"), [&]
+            {
                 buttons_param[button_id] = Common::ParamPackage{
                     InputCommon::GenerateKeyboardParam(Config::default_buttons[button_id])};
                 button_map[button_id]->setText(ButtonToText(buttons_param[button_id]));
@@ -290,22 +309,27 @@ ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, std::size_t player_i
             }
 
             analog_button->setContextMenuPolicy(Qt::CustomContextMenu);
-            connect(analog_button, &QPushButton::clicked, [=]() {
+            connect(analog_button, &QPushButton::clicked, [=]()
+            {
                 HandleClick(analog_map_buttons[analog_id][sub_button_id],
-                            [=](const Common::ParamPackage& params) {
+                            [=](const Common::ParamPackage& params)
+                            {
                                 SetAnalogButton(params, analogs_param[analog_id],
                                                 analog_sub_buttons[sub_button_id]);
                             },
                             InputCommon::Polling::DeviceType::Button);
             });
             connect(analog_button, &QPushButton::customContextMenuRequested,
-                    [=](const QPoint& menu_location) {
+                    [=](const QPoint& menu_location)
+                    {
                         QMenu context_menu;
-                        context_menu.addAction(tr("Clear"), [&] {
+                        context_menu.addAction(tr("Clear"), [&]
+                        {
                             analogs_param[analog_id].Erase(analog_sub_buttons[sub_button_id]);
                             analog_map_buttons[analog_id][sub_button_id]->setText(tr("[not set]"));
                         });
-                        context_menu.addAction(tr("Restore Default"), [&] {
+                        context_menu.addAction(tr("Restore Default"), [&]
+                        {
                             Common::ParamPackage params{InputCommon::GenerateKeyboardParam(
                                 Config::default_analogs[analog_id][sub_button_id])};
                             SetAnalogButton(params, analogs_param[analog_id],
@@ -317,7 +341,8 @@ ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, std::size_t player_i
                             menu_location));
                     });
         }
-        connect(analog_map_stick[analog_id], &QPushButton::clicked, [=] {
+        connect(analog_map_stick[analog_id], &QPushButton::clicked, [=]
+        {
             if (QMessageBox::information(
                     this, tr("Information"),
                     tr("After pressing OK, first move your joystick horizontally, "
@@ -330,9 +355,11 @@ ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, std::size_t player_i
             }
         });
 
-        connect(analog_map_deadzone_and_modifier_slider[analog_id], &QSlider::valueChanged, [=] {
+        connect(analog_map_deadzone_and_modifier_slider[analog_id], &QSlider::valueChanged, [=]
+        {
             const float slider_value = analog_map_deadzone_and_modifier_slider[analog_id]->value();
-            if (analogs_param[analog_id].Get("engine", "") == "sdl") {
+            if (analogs_param[analog_id].Get("engine", "") == "sdl" ||
+                analogs_param[analog_id].Get("engine", "") == "gcpad") {
                 analog_map_deadzone_and_modifier_slider_label[analog_id]->setText(
                     tr("Deadzone: %1%").arg(slider_value));
                 analogs_param[analog_id].Set("deadzone", slider_value / 100.0f);
@@ -350,8 +377,23 @@ ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, std::size_t player_i
     timeout_timer->setSingleShot(true);
     connect(timeout_timer.get(), &QTimer::timeout, [this] { SetPollingResult({}, true); });
 
-    connect(poll_timer.get(), &QTimer::timeout, [this] {
+    connect(poll_timer.get(), &QTimer::timeout, [this]
+    {
         Common::ParamPackage params;
+        if (InputCommon::GetGCButtons()->IsPolling()) {
+            params = InputCommon::GetGCButtons()->GetNextInput();
+            if (params.Has("engine")) {
+                SetPollingResult(params, false);
+                return;
+            }
+        }
+        if (InputCommon::GetGCAnalogs()->IsPolling()) {
+            params = InputCommon::GetGCAnalogs()->GetNextInput();
+            if (params.Has("engine")) {
+                SetPollingResult(params, false);
+                return;
+            }
+        }
         for (auto& poller : device_pollers) {
             params = poller->GetNextInput();
             if (params.Has("engine")) {
@@ -534,7 +576,7 @@ void ConfigureInputPlayer::UpdateButtonLabels() {
             analog_map_deadzone_and_modifier_slider_label[analog_id];
 
         if (param.Has("engine")) {
-            if (param.Get("engine", "") == "sdl") {
+            if (param.Get("engine", "") == "sdl" || param.Get("engine", "") == "gcpad") {
                 if (!param.Has("deadzone")) {
                     param.Set("deadzone", 0.1f);
                 }
@@ -583,6 +625,10 @@ void ConfigureInputPlayer::HandleClick(
 
     grabKeyboard();
     grabMouse();
+    if (type == InputCommon::Polling::DeviceType::Button)
+        InputCommon::GetGCButtons()->BeginConfiguration();
+    else
+        InputCommon::GetGCAnalogs()->BeginConfiguration();
     timeout_timer->start(5000); // Cancel after 5 seconds
     poll_timer->start(200);     // Check for new inputs every 200ms
 }
@@ -596,6 +642,9 @@ void ConfigureInputPlayer::SetPollingResult(const Common::ParamPackage& params,
         poller->Stop();
     }
 
+    InputCommon::GetGCButtons()->EndConfiguration();
+    InputCommon::GetGCAnalogs()->EndConfiguration();
+
     if (!abort) {
         (*input_setter)(params);
     }