9 files changed, 289 insertions, 228 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b71071271..967968226 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -328,6 +328,12 @@ elseif(SDL2_FOUND)
     target_link_libraries(SDL2 INTERFACE "${SDL2_LIBRARIES}")
 endif()
 
+# Ensure libusb is properly configured (based on dolphin libusb include)
+find_package(LibUSB)
+add_subdirectory(externals/libusb)
+set(LIBUSB_LIBRARIES usb)
+
+
 # Prefer the -pthread flag on Linux.
 set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads REQUIRED)
diff --git a/src/input_common/gcadapter/gc_adapter.cpp b/src/input_common/gcadapter/gc_adapter.cpp
index dc04116ce..0696a96c7 100644
--- a/src/input_common/gcadapter/gc_adapter.cpp
+++ b/src/input_common/gcadapter/gc_adapter.cpp
@@ -3,45 +3,41 @@
 // 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 {
+Adapter* Adapter::adapter_instance{nullptr};
 
-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;
+Adapter::Adapter() {
+    if (usb_adapter_handle != nullptr) {
+        return;
+    }
+    LOG_INFO(Input, "GC Adapter Initialization started");
 
-static libusb_context* libusb_ctx;
+    current_status = NO_ADAPTER_DETECTED;
+    libusb_init(&libusb_ctx);
 
-static u8 input_endpoint = 0;
+    StartScanThread();
+}
 
-static bool configuring = false;
+Adapter* Adapter::GetInstance() {
+    if (!adapter_instance) {
+        adapter_instance = new Adapter;
+    }
+    return adapter_instance;
+}
 
-GCPadStatus CheckStatus(int port, u8 adapter_payload[37]) {
+GCPadStatus Adapter::CheckStatus(int port, u8 adapter_payload[37]) {
     GCPadStatus pad = {};
     bool get_origin = false;
 
-    u8 type = adapter_payload[1 + (9 * port)] >> 4;
-    if (type)
+    ControllerTypes type = ControllerTypes(adapter_payload[1 + (9 * port)] >> 4);
+    if (type != ControllerTypes::None)
         get_origin = true;
 
     adapter_controllers_status[port] = type;
 
-    if (adapter_controllers_status[port] != ControllerTypes::CONTROLLER_NONE) {
+    if (adapter_controllers_status[port] != ControllerTypes::None) {
         u8 b1 = adapter_payload[1 + (9 * port) + 1];
         u8 b2 = adapter_payload[1 + (9 * port) + 2];
 
@@ -88,18 +84,17 @@ GCPadStatus CheckStatus(int port, u8 adapter_payload[37]) {
             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];
+        pad.stick_x = adapter_payload[1 + (9 * port) + 3];
+        pad.stick_y = adapter_payload[1 + (9 * port) + 4];
+        pad.substick_x = adapter_payload[1 + (9 * port) + 5];
+        pad.substick_y = adapter_payload[1 + (9 * port) + 6];
+        pad.trigger_left = adapter_payload[1 + (9 * port) + 7];
+        pad.trigger_right = adapter_payload[1 + (9 * port) + 8];
     }
     return pad;
 }
 
-void PadToState(GCPadStatus pad, GCState& state) {
-    // std::lock_guard lock{s_mutex};
+void Adapter::PadToState(GCPadStatus pad, GCState& state) {
     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);
@@ -112,15 +107,15 @@ void PadToState(GCPadStatus pad, GCState& state) {
     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);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::StickX), pad.stick_x);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::StickY), pad.stick_y);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::SubstickX), pad.substick_x);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::SubstickY), pad.substick_y);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::TriggerLeft), pad.trigger_left);
+    state.axes.insert_or_assign(static_cast<u8>(PadAxes::TriggerRight), pad.trigger_right);
 }
 
-static void Read() {
+void Adapter::Read() {
     LOG_INFO(Input, "GC Adapter Read() thread started");
 
     int payload_size_in;
@@ -145,8 +140,9 @@ static void Read() {
             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++) {
+                pad[port] = CheckStatus(port, controller_payload_copy);
+            }
         }
         for (int port = 0; port < 4; port++) {
             if (DeviceConnected(port) && configuring) {
@@ -155,28 +151,36 @@ static void Read() {
                 }
 
                 // 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;
+                if (pad[port].stick_x >
+                        pad_constants.MAIN_STICK_CENTER_X + pad_constants.THRESHOLD ||
+                    pad[port].stick_x <
+                        pad_constants.MAIN_STICK_CENTER_X - pad_constants.THRESHOLD) {
+                    pad[port].axis = GCAdapter::PadAxes::StickX;
+                    pad[port].axis_value = pad[port].stick_x;
                     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;
+                if (pad[port].stick_y >
+                        pad_constants.MAIN_STICK_CENTER_Y + pad_constants.THRESHOLD ||
+                    pad[port].stick_y <
+                        pad_constants.MAIN_STICK_CENTER_Y - pad_constants.THRESHOLD) {
+                    pad[port].axis = GCAdapter::PadAxes::StickY;
+                    pad[port].axis_value = pad[port].stick_y;
                     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;
+                if (pad[port].substick_x >
+                        pad_constants.C_STICK_CENTER_X + pad_constants.THRESHOLD ||
+                    pad[port].substick_x <
+                        pad_constants.C_STICK_CENTER_X - pad_constants.THRESHOLD) {
+                    pad[port].axis = GCAdapter::PadAxes::SubstickX;
+                    pad[port].axis_value = pad[port].substick_x;
                     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;
+                if (pad[port].substick_y >
+                        pad_constants.C_STICK_CENTER_Y + pad_constants.THRESHOLD ||
+                    pad[port].substick_y <
+                        pad_constants.C_STICK_CENTER_Y - pad_constants.THRESHOLD) {
+                    pad[port].axis = GCAdapter::PadAxes::SubstickY;
+                    pad[port].axis_value = pad[port].substick_y;
                     pad_queue[port].Push(pad[port]);
                 }
             }
@@ -186,7 +190,7 @@ static void Read() {
     }
 }
 
-static void ScanThreadFunc() {
+void Adapter::ScanThreadFunc() {
     LOG_INFO(Input, "GC Adapter scanning thread started");
 
     while (detect_thread_running) {
@@ -198,20 +202,7 @@ static void ScanThreadFunc() {
     }
 }
 
-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() {
+void Adapter::StartScanThread() {
     if (detect_thread_running) {
         return;
     }
@@ -220,21 +211,21 @@ void StartScanThread() {
     }
 
     detect_thread_running = true;
-    detect_thread = std::thread(ScanThreadFunc);
+    detect_thread = std::thread([=] { ScanThreadFunc(); });
 }
 
-void StopScanThread() {
+void Adapter::StopScanThread() {
     detect_thread.join();
 }
 
-static void Setup() {
+void Adapter::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;
+        adapter_controllers_status[i] = ControllerTypes::None;
     }
 
     libusb_device** devs; // pointer to list of connected usb devices
@@ -250,7 +241,7 @@ static void Setup() {
     }
 }
 
-static bool CheckDeviceAccess(libusb_device* device) {
+bool Adapter::CheckDeviceAccess(libusb_device* device) {
     libusb_device_descriptor desc;
     int ret = libusb_get_device_descriptor(device, &desc);
     if (ret) {
@@ -300,7 +291,7 @@ static bool CheckDeviceAccess(libusb_device* device) {
     return true;
 }
 
-static void GetGCEndpoint(libusb_device* device) {
+void Adapter::GetGCEndpoint(libusb_device* device) {
     libusb_config_descriptor* config = nullptr;
     libusb_get_config_descriptor(device, 0, &config);
     for (u8 ic = 0; ic < config->bNumInterfaces; ic++) {
@@ -318,18 +309,17 @@ static void GetGCEndpoint(libusb_device* device) {
 
     adapter_thread_running = true;
     current_status = ADAPTER_DETECTED;
-
-    adapter_input_thread = std::thread(Read); // Read input
+    adapter_input_thread = std::thread([=] { Read(); }); // Read input
 }
 
-void Shutdown() {
+Adapter::~Adapter() {
     StopScanThread();
     Reset();
 
     current_status = NO_ADAPTER_DETECTED;
 }
 
-static void Reset() {
+void Adapter::Reset() {
     std::unique_lock<std::mutex> lock(initialization_mutex, std::defer_lock);
     if (!lock.try_lock()) {
         return;
@@ -343,7 +333,7 @@ static void Reset() {
     }
 
     for (int i = 0; i < 4; i++) {
-        adapter_controllers_status[i] = ControllerTypes::CONTROLLER_NONE;
+        adapter_controllers_status[i] = ControllerTypes::None;
     }
 
     current_status = NO_ADAPTER_DETECTED;
@@ -355,20 +345,28 @@ static void Reset() {
     }
 }
 
-bool DeviceConnected(int port) {
-    return adapter_controllers_status[port] != ControllerTypes::CONTROLLER_NONE;
+bool Adapter::DeviceConnected(int port) {
+    return adapter_controllers_status[port] != ControllerTypes::None;
 }
 
-void ResetDeviceType(int port) {
-    adapter_controllers_status[port] = ControllerTypes::CONTROLLER_NONE;
+void Adapter::ResetDeviceType(int port) {
+    adapter_controllers_status[port] = ControllerTypes::None;
 }
 
-void BeginConfiguration() {
+void Adapter::BeginConfiguration() {
     configuring = true;
 }
 
-void EndConfiguration() {
+void Adapter::EndConfiguration() {
     configuring = false;
 }
 
+std::array<Common::SPSCQueue<GCPadStatus>, 4>& Adapter::GetPadQueue() {
+    return pad_queue;
+}
+
+std::array<GCState, 4>& Adapter::GetPadState() {
+    return state;
+}
+
 } // end of namespace GCAdapter
diff --git a/src/input_common/gcadapter/gc_adapter.h b/src/input_common/gcadapter/gc_adapter.h
index 05ee73c65..3d5c41f9a 100644
--- a/src/input_common/gcadapter/gc_adapter.h
+++ b/src/input_common/gcadapter/gc_adapter.h
@@ -8,6 +8,9 @@
 #include <mutex>
 #include <libusb.h>
 #include "common/common_types.h"
+#include "common/threadsafe_queue.h"
+
+namespace GCAdapter {
 
 enum {
     PAD_USE_ORIGIN = 0x0080,
@@ -33,29 +36,38 @@ enum PadButton {
 
 };
 
-enum PadAxes { STICK_X, STICK_Y, SUBSTICK_X, SUBSTICK_Y, TRIGGER_LEFT, TRIGGER_RIGHT };
+enum class PadAxes : u8 {
+    StickX,
+    StickY,
+    SubstickX,
+    SubstickY,
+    TriggerLeft,
+    TriggerRight,
+    Undefined,
+};
+const struct GCPadConstants {
+    const u8 MAIN_STICK_CENTER_X = 0x80;
+    const u8 MAIN_STICK_CENTER_Y = 0x80;
+    const u8 MAIN_STICK_RADIUS = 0x7f;
+    const u8 C_STICK_CENTER_X = 0x80;
+    const u8 C_STICK_CENTER_Y = 0x80;
+    const u8 C_STICK_RADIUS = 0x7f;
+
+    const u8 TRIGGER_CENTER = 20;
+    const u8 THRESHOLD = 10;
+} pad_constants;
 
 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;
+    u16 button;       // Or-ed PAD_BUTTON_* and PAD_TRIGGER_* bits
+    u8 stick_x;       // 0 <= stick_x       <= 255
+    u8 stick_y;       // 0 <= stick_y       <= 255
+    u8 substick_x;    // 0 <= substick_x    <= 255
+    u8 substick_y;    // 0 <= substick_y    <= 255
+    u8 trigger_left;  // 0 <= trigger_left  <= 255
+    u8 trigger_right; // 0 <= trigger_right <= 255
+
     u8 port;
-    u8 axis_which = 255;
+    PadAxes axis = PadAxes::Undefined;
     u8 axis_value = 255;
 };
 
@@ -64,51 +76,88 @@ struct GCState {
     std::unordered_map<int, u16> axes;
 };
 
-namespace GCAdapter {
-enum ControllerTypes { CONTROLLER_NONE = 0, CONTROLLER_WIRED = 1, CONTROLLER_WIRELESS = 2 };
+enum class ControllerTypes { None, Wired, Wireless };
 
 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;
+/// Singleton Adapter class
+class Adapter {
+public:
+    /// For retreiving the singleton instance
+    static Adapter* GetInstance();
+
+    /// Used for polling
+    void BeginConfiguration();
+    void EndConfiguration();
+
+    std::array<Common::SPSCQueue<GCPadStatus>, 4>& GetPadQueue();
+    std::array<GCState, 4>& GetPadState();
+
+private:
+    /// Singleton instance.
+    static Adapter* adapter_instance;
+
+    /// Initialize the GC Adapter capture and read sequence
+    Adapter();
 
-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
+    ~Adapter();
 
-/// Close the adapter read thread and release the adapter
-void Shutdown();
+    GCPadStatus CheckStatus(int port, u8 adapter_payload[37]);
 
-/// Begin scanning for the GC Adapter.
-void StartScanThread();
+    void PadToState(GCPadStatus pad, GCState& state);
 
-/// Stop scanning for the adapter
-void StopScanThread();
+    void Read();
+    void ScanThreadFunc();
+    /// Begin scanning for the GC Adapter.
+    void StartScanThread();
 
-/// Returns true if there is a device connected to port
-bool DeviceConnected(int port);
+    /// Stop scanning for the adapter
+    void StopScanThread();
 
-/// Resets status of device connected to port
-void ResetDeviceType(int port);
+    /// Returns true if there is a device connected to port
+    bool DeviceConnected(int port);
 
-/// Returns true if we successfully gain access to GC Adapter
-bool CheckDeviceAccess(libusb_device* device);
+    /// Resets status of device connected to port
+    void ResetDeviceType(int port);
 
-/// Captures GC Adapter endpoint address,
-void GetGCEndpoint(libusb_device* device);
+    /// Returns true if we successfully gain access to GC Adapter
+    bool CheckDeviceAccess(libusb_device* device);
 
-/// For shutting down, clear all data, join all threads, release usb
-void Reset();
+    /// Captures GC Adapter endpoint address,
+    void GetGCEndpoint(libusb_device* device);
 
-/// For use in initialization, querying devices to find the adapter
-void Setup();
+    /// For shutting down, clear all data, join all threads, release usb
+    void Reset();
 
-/// Used for polling
-void BeginConfiguration();
+    /// For use in initialization, querying devices to find the adapter
+    void Setup();
 
-void EndConfiguration();
+    int current_status = NO_ADAPTER_DETECTED;
+    libusb_device_handle* usb_adapter_handle = nullptr;
+    ControllerTypes adapter_controllers_status[4] = {ControllerTypes::None, ControllerTypes::None,
+                                                     ControllerTypes::None, ControllerTypes::None};
+
+    std::mutex s_mutex;
+
+    std::thread adapter_input_thread;
+    bool adapter_thread_running;
+
+    std::mutex initialization_mutex;
+    std::thread detect_thread;
+    bool detect_thread_running = false;
+
+    libusb_context* libusb_ctx;
+
+    u8 input_endpoint = 0;
+
+    bool configuring = false;
+
+    std::array<Common::SPSCQueue<GCPadStatus>, 4> pad_queue;
+    std::array<GCState, 4> state;
+};
 
 } // end of namespace GCAdapter
diff --git a/src/input_common/gcadapter/gc_poller.cpp b/src/input_common/gcadapter/gc_poller.cpp
index 51b3362d6..0e591baca 100644
--- a/src/input_common/gcadapter/gc_poller.cpp
+++ b/src/input_common/gcadapter/gc_poller.cpp
@@ -10,35 +10,34 @@
 #include "input_common/gcadapter/gc_adapter.h"
 #include "input_common/gcadapter/gc_poller.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_) {}
+    explicit GCButton(int port_, int button_, int axis_, GCAdapter::Adapter* adapter)
+        : port(port_), button(button_), gcadapter(adapter) {}
 
     ~GCButton() override;
 
     bool GetStatus() const override {
-        return state[port].buttons.at(button);
+        return gcadapter->GetPadState()[port].buttons.at(button);
     }
 
 private:
     const int port;
     const int button;
+    GCAdapter::Adapter* gcadapter;
 };
 
 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_) {
-    }
+    explicit GCAxisButton(int port_, int axis_, float threshold_, bool trigger_if_greater_,
+                          GCAdapter::Adapter* adapter)
+        : port(port_), axis(axis_), threshold(threshold_), trigger_if_greater(trigger_if_greater_),
+          gcadapter(adapter) {}
 
     bool GetStatus() const override {
-        const float axis_value = (state[port].axes.at(axis) - 128.0f) / 128.0f;
+        const float axis_value = (gcadapter->GetPadState()[port].axes.at(axis) - 128.0f) / 128.0f;
         if (trigger_if_greater) {
             return axis_value > 0.10f; // TODO(ameerj) : Fix threshold.
         }
@@ -50,14 +49,15 @@ private:
     const int axis;
     float threshold;
     bool trigger_if_greater;
+    GCAdapter::Adapter* gcadapter;
 };
 
 GCButtonFactory::GCButtonFactory() {
-    GCAdapter::Init();
+    adapter = GCAdapter::Adapter::GetInstance();
 }
 
 GCButton::~GCButton() {
-    GCAdapter::Shutdown();
+    // GCAdapter::Shutdown();
 }
 
 std::unique_ptr<Input::ButtonDevice> GCButtonFactory::Create(const Common::ParamPackage& params) {
@@ -77,76 +77,76 @@ std::unique_ptr<Input::ButtonDevice> GCButtonFactory::Create(const Common::Param
             trigger_if_greater = true;
             LOG_ERROR(Input, "Unknown direction {}", direction_name);
         }
-        return std::make_unique<GCAxisButton>(port, axis, threshold, trigger_if_greater);
+        return std::make_unique<GCAxisButton>(port, axis, threshold, trigger_if_greater, adapter);
     }
 
     std::unique_ptr<GCButton> button =
-        std::make_unique<GCButton>(port, button_id, params.Get("axis", 0));
+        std::make_unique<GCButton>(port, button_id, params.Get("axis", 0), adapter);
     return std::move(button);
 }
 
 Common::ParamPackage GCButtonFactory::GetNextInput() {
     Common::ParamPackage params;
-    GCPadStatus pad;
+    GCAdapter::GCPadStatus pad;
     for (int i = 0; i < 4; i++) {
-        while (pad_queue[i].Pop(pad)) {
+        while (adapter->GetPadQueue()[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);
+            if (pad.button & GCAdapter::PAD_BUTTON_A) {
+                params.Set("button", GCAdapter::PAD_BUTTON_A);
                 break;
             }
-            if (pad.button & PAD_BUTTON_B) {
-                params.Set("button", PAD_BUTTON_B);
+            if (pad.button & GCAdapter::PAD_BUTTON_B) {
+                params.Set("button", GCAdapter::PAD_BUTTON_B);
                 break;
             }
-            if (pad.button & PAD_BUTTON_X) {
-                params.Set("button", PAD_BUTTON_X);
+            if (pad.button & GCAdapter::PAD_BUTTON_X) {
+                params.Set("button", GCAdapter::PAD_BUTTON_X);
                 break;
             }
-            if (pad.button & PAD_BUTTON_Y) {
-                params.Set("button", PAD_BUTTON_Y);
+            if (pad.button & GCAdapter::PAD_BUTTON_Y) {
+                params.Set("button", GCAdapter::PAD_BUTTON_Y);
                 break;
             }
-            if (pad.button & PAD_BUTTON_DOWN) {
-                params.Set("button", PAD_BUTTON_DOWN);
+            if (pad.button & GCAdapter::PAD_BUTTON_DOWN) {
+                params.Set("button", GCAdapter::PAD_BUTTON_DOWN);
                 break;
             }
-            if (pad.button & PAD_BUTTON_LEFT) {
-                params.Set("button", PAD_BUTTON_LEFT);
+            if (pad.button & GCAdapter::PAD_BUTTON_LEFT) {
+                params.Set("button", GCAdapter::PAD_BUTTON_LEFT);
                 break;
             }
-            if (pad.button & PAD_BUTTON_RIGHT) {
-                params.Set("button", PAD_BUTTON_RIGHT);
+            if (pad.button & GCAdapter::PAD_BUTTON_RIGHT) {
+                params.Set("button", GCAdapter::PAD_BUTTON_RIGHT);
                 break;
             }
-            if (pad.button & PAD_BUTTON_UP) {
-                params.Set("button", PAD_BUTTON_UP);
+            if (pad.button & GCAdapter::PAD_BUTTON_UP) {
+                params.Set("button", GCAdapter::PAD_BUTTON_UP);
                 break;
             }
-            if (pad.button & PAD_TRIGGER_L) {
-                params.Set("button", PAD_TRIGGER_L);
+            if (pad.button & GCAdapter::PAD_TRIGGER_L) {
+                params.Set("button", GCAdapter::PAD_TRIGGER_L);
                 break;
             }
-            if (pad.button & PAD_TRIGGER_R) {
-                params.Set("button", PAD_TRIGGER_R);
+            if (pad.button & GCAdapter::PAD_TRIGGER_R) {
+                params.Set("button", GCAdapter::PAD_TRIGGER_R);
                 break;
             }
-            if (pad.button & PAD_TRIGGER_Z) {
-                params.Set("button", PAD_TRIGGER_Z);
+            if (pad.button & GCAdapter::PAD_TRIGGER_Z) {
+                params.Set("button", GCAdapter::PAD_TRIGGER_Z);
                 break;
             }
-            if (pad.button & PAD_BUTTON_START) {
-                params.Set("button", PAD_BUTTON_START);
+            if (pad.button & GCAdapter::PAD_BUTTON_START) {
+                params.Set("button", GCAdapter::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 != GCAdapter::PadAxes::Undefined) {
+                params.Set("axis", static_cast<u8>(pad.axis));
+                params.Set("button", GCAdapter::PAD_STICK);
                 if (pad.axis_value > 128) {
                     params.Set("direction", "+");
                     params.Set("threshold", "0.5");
@@ -164,30 +164,30 @@ Common::ParamPackage GCButtonFactory::GetNextInput() {
 void GCButtonFactory::BeginConfiguration() {
     polling = true;
     for (int i = 0; i < 4; i++) {
-        pad_queue[i].Clear();
+        adapter->GetPadQueue()[i].Clear();
     }
-    GCAdapter::BeginConfiguration();
+    adapter->BeginConfiguration();
 }
 
 void GCButtonFactory::EndConfiguration() {
     polling = false;
     for (int i = 0; i < 4; i++) {
-        pad_queue[i].Clear();
+        adapter->GetPadQueue()[i].Clear();
     }
-    GCAdapter::EndConfiguration();
+    adapter->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_) {}
+    GCAnalog(int port_, int axis_x_, int axis_y_, float deadzone_, GCAdapter::Adapter* adapter)
+        : port(port_), axis_x(axis_x_), axis_y(axis_y_), deadzone(deadzone_), gcadapter(adapter) {}
 
     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;
+        return (gcadapter->GetPadState()[port].axes.at(axis) - 128.0f) / 95.0f;
     }
 
     std::tuple<float, float> GetAnalog(int axis_x, int axis_y) const {
@@ -238,10 +238,13 @@ private:
     const int axis_y;
     const float deadzone;
     mutable std::mutex mutex;
+    GCAdapter::Adapter* gcadapter;
 };
 
 /// An analog device factory that creates analog devices from GC Adapter
-GCAnalogFactory::GCAnalogFactory(){};
+GCAnalogFactory::GCAnalogFactory() {
+    adapter = GCAdapter::Adapter::GetInstance();
+};
 
 /**
  * Creates analog device from joystick axes
@@ -257,35 +260,36 @@ std::unique_ptr<Input::AnalogDevice> GCAnalogFactory::Create(const Common::Param
     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);
+    return std::make_unique<GCAnalog>(port, axis_x, axis_y, deadzone, adapter);
 }
 
 void GCAnalogFactory::BeginConfiguration() {
     polling = true;
     for (int i = 0; i < 4; i++) {
-        pad_queue[i].Clear();
+        adapter->GetPadQueue()[i].Clear();
     }
-    GCAdapter::BeginConfiguration();
+    adapter->BeginConfiguration();
 }
 
 void GCAnalogFactory::EndConfiguration() {
     polling = false;
     for (int i = 0; i < 4; i++) {
-        pad_queue[i].Clear();
+        adapter->GetPadQueue()[i].Clear();
     }
-    GCAdapter::EndConfiguration();
+    adapter->EndConfiguration();
 }
 
 Common::ParamPackage GCAnalogFactory::GetNextInput() {
-    GCPadStatus pad;
+    GCAdapter::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) {
+        while (adapter->GetPadQueue()[i].Pop(pad)) {
+            if (pad.axis == GCAdapter::PadAxes::Undefined ||
+                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;
+            const u8 axis = static_cast<u8>(pad.axis);
             if (analog_x_axis == -1) {
                 analog_x_axis = axis;
                 controller_number = i;
@@ -307,4 +311,5 @@ Common::ParamPackage GCAnalogFactory::GetNextInput() {
     }
     return params;
 }
+
 } // namespace InputCommon
diff --git a/src/input_common/gcadapter/gc_poller.h b/src/input_common/gcadapter/gc_poller.h
index 43aa9e93a..29b8c0b7c 100644
--- a/src/input_common/gcadapter/gc_poller.h
+++ b/src/input_common/gcadapter/gc_poller.h
@@ -35,6 +35,7 @@ public:
     }
 
 private:
+    GCAdapter::Adapter* adapter;
     bool polling = false;
 };
 
@@ -54,9 +55,11 @@ public:
     }
 
 private:
+    GCAdapter::Adapter* adapter;
     int analog_x_axis = -1;
     int analog_y_axis = -1;
     int controller_number = -1;
     bool polling = false;
 };
+
 } // namespace InputCommon
diff --git a/src/input_common/main.cpp b/src/input_common/main.cpp
index 7fc0e2db4..536e5c80a 100644
--- a/src/input_common/main.cpp
+++ b/src/input_common/main.cpp
@@ -2,11 +2,13 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <iostream>
 #include <memory>
 #include <thread>
 #include <libusb.h>
 #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"
diff --git a/src/input_common/main.h b/src/input_common/main.h
index 9e1528c88..c26222f21 100644
--- a/src/input_common/main.h
+++ b/src/input_common/main.h
@@ -32,10 +32,8 @@ 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
diff --git a/src/input_common/udp/client.cpp b/src/input_common/udp/client.cpp
index 4c9794ce2..da5227058 100644
--- a/src/input_common/udp/client.cpp
+++ b/src/input_common/udp/client.cpp
@@ -225,7 +225,8 @@ void TestCommunication(const std::string& host, u16 port, u8 pad_index, u32 clie
         } else {
             failure_callback();
         }
-    }).detach();
+    })
+        .detach();
 }
 
 CalibrationConfigurationJob::CalibrationConfigurationJob(
@@ -279,7 +280,8 @@ CalibrationConfigurationJob::CalibrationConfigurationJob(
         complete_event.Wait();
         socket.Stop();
         worker_thread.join();
-    }).detach();
+    })
+        .detach();
 }
 
 CalibrationConfigurationJob::~CalibrationConfigurationJob() {
diff --git a/src/yuzu/configuration/configure_input_player.cpp b/src/yuzu/configuration/configure_input_player.cpp
index c1a0c423b..c7d3f4510 100644
--- a/src/yuzu/configuration/configure_input_player.cpp
+++ b/src/yuzu/configuration/configure_input_player.cpp
@@ -262,25 +262,24 @@ ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, std::size_t player_i
 
         button->setContextMenuPolicy(Qt::CustomContextMenu);
         connect(button, &QPushButton::clicked, [=] {
-            HandleClick(
-                button_map[button_id],
-                [=](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
-                    // analog triggers instead of -32768 to 32768 on analog joysticks). The
-                    // SDL driver misinterprets analog triggers as analog joysticks.
-                    // TODO: reinterpret the signal range for analog triggers to map the
-                    // values correctly. This is required for the correct emulation of the
-                    // analog triggers of the GameCube controller.
-                    if (button_id == Settings::NativeButton::ZL ||
-                        button_id == Settings::NativeButton::ZR) {
-                        params.Set("direction", "+");
-                        params.Set("threshold", "0.5");
-                    }
-                    buttons_param[button_id] = std::move(params);
-                },
-                InputCommon::Polling::DeviceType::Button);
+            HandleClick(button_map[button_id],
+                        [=](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
+                            // analog triggers instead of -32768 to 32768 on analog joysticks). The
+                            // SDL driver misinterprets analog triggers as analog joysticks.
+                            // TODO: reinterpret the signal range for analog triggers to map the
+                            // values correctly. This is required for the correct emulation of the
+                            // analog triggers of the GameCube controller.
+                            if (button_id == Settings::NativeButton::ZL ||
+                                button_id == Settings::NativeButton::ZR) {
+                                params.Set("direction", "+");
+                                params.Set("threshold", "0.5");
+                            }
+                            buttons_param[button_id] = std::move(params);
+                        },
+                        InputCommon::Polling::DeviceType::Button);
         });
         connect(button, &QPushButton::customContextMenuRequested, [=](const QPoint& menu_location) {
             QMenu context_menu;
@@ -306,13 +305,12 @@ ConfigureInputPlayer::ConfigureInputPlayer(QWidget* parent, std::size_t player_i
 
             analog_button->setContextMenuPolicy(Qt::CustomContextMenu);
             connect(analog_button, &QPushButton::clicked, [=]() {
-                HandleClick(
-                    analog_map_buttons[analog_id][sub_button_id],
-                    [=](const Common::ParamPackage& params) {
-                        SetAnalogButton(params, analogs_param[analog_id],
-                                        analog_sub_buttons[sub_button_id]);
-                    },
-                    InputCommon::Polling::DeviceType::Button);
+                HandleClick(analog_map_buttons[analog_id][sub_button_id],
+                            [=](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) {