3 files changed, 75 insertions, 181 deletions

diff --git a/src/input_common/gcadapter/gc_adapter.cpp b/src/input_common/gcadapter/gc_adapter.cpp
index 38210ffcb..02d06876f 100644
--- a/src/input_common/gcadapter/gc_adapter.cpp
+++ b/src/input_common/gcadapter/gc_adapter.cpp
@@ -24,11 +24,9 @@ Adapter::Adapter() {
     }
     LOG_INFO(Input, "GC Adapter Initialization started");
 
-    current_status = NO_ADAPTER_DETECTED;
-
     const int init_res = libusb_init(&libusb_ctx);
     if (init_res == LIBUSB_SUCCESS) {
-        StartScanThread();
+        Setup();
     } else {
         LOG_ERROR(Input, "libusb could not be initialized. failed with error = {}", init_res);
     }
@@ -36,14 +34,9 @@ Adapter::Adapter() {
 
 GCPadStatus Adapter::GetPadStatus(std::size_t port, const std::array<u8, 37>& adapter_payload) {
     GCPadStatus pad = {};
-    bool get_origin = false;
-
-    ControllerTypes type = ControllerTypes(adapter_payload[1 + (9 * port)] >> 4);
-    if (type != ControllerTypes::None) {
-        get_origin = true;
-    }
+    const std::size_t offset = 1 + (9 * port);
 
-    adapter_controllers_status[port] = type;
+    adapter_controllers_status[port] = static_cast<ControllerTypes>(adapter_payload[offset] >> 4);
 
     static constexpr std::array<PadButton, 8> b1_buttons{
         PadButton::PAD_BUTTON_A,    PadButton::PAD_BUTTON_B,    PadButton::PAD_BUTTON_X,
@@ -58,9 +51,19 @@ GCPadStatus Adapter::GetPadStatus(std::size_t port, const std::array<u8, 37>& ad
         PadButton::PAD_TRIGGER_L,
     };
 
+    static constexpr std::array<PadAxes, 6> axes{
+        PadAxes::StickX,    PadAxes::StickY,      PadAxes::SubstickX,
+        PadAxes::SubstickY, PadAxes::TriggerLeft, PadAxes::TriggerRight,
+    };
+
+    if (adapter_controllers_status[port] == ControllerTypes::None && !get_origin[port]) {
+        // Controller may have been disconnected, recalibrate if reconnected.
+        get_origin[port] = true;
+    }
+
     if (adapter_controllers_status[port] != ControllerTypes::None) {
-        const u8 b1 = adapter_payload[1 + (9 * port) + 1];
-        const u8 b2 = adapter_payload[1 + (9 * port) + 2];
+        const u8 b1 = adapter_payload[offset + 1];
+        const u8 b2 = adapter_payload[offset + 2];
 
         for (std::size_t i = 0; i < b1_buttons.size(); ++i) {
             if ((b1 & (1U << i)) != 0) {
@@ -73,17 +76,15 @@ GCPadStatus Adapter::GetPadStatus(std::size_t port, const std::array<u8, 37>& ad
                 pad.button |= static_cast<u16>(b2_buttons[j]);
             }
         }
-
-        if (get_origin) {
-            pad.button |= PAD_GET_ORIGIN;
+        for (PadAxes axis : axes) {
+            const std::size_t index = static_cast<std::size_t>(axis);
+            pad.axis_values[index] = adapter_payload[offset + 3 + index];
         }
 
-        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];
+        if (get_origin[port]) {
+            origin_status[port].axis_values = pad.axis_values;
+            get_origin[port] = false;
+        }
     }
     return pad;
 }
@@ -94,82 +95,47 @@ void Adapter::PadToState(const GCPadStatus& pad, GCState& state) {
         state.buttons.insert_or_assign(button_value, pad.button & button_value);
     }
 
-    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);
+    for (size_t i = 0; i < pad.axis_values.size(); ++i) {
+        state.axes.insert_or_assign(static_cast<u8>(i), pad.axis_values[i]);
+    }
 }
 
 void Adapter::Read() {
     LOG_DEBUG(Input, "GC Adapter Read() thread started");
 
-    int payload_size_in, payload_size_copy;
+    int payload_size;
     std::array<u8, 37> adapter_payload;
-    std::array<u8, 37> adapter_payload_copy;
     std::array<GCPadStatus, 4> pads;
 
     while (adapter_thread_running) {
         libusb_interrupt_transfer(usb_adapter_handle, input_endpoint, adapter_payload.data(),
-                                  sizeof(adapter_payload), &payload_size_in, 16);
-        payload_size_copy = 0;
-        // this mutex might be redundant?
-        {
-            std::lock_guard<std::mutex> lk(s_mutex);
-            std::copy(std::begin(adapter_payload), std::end(adapter_payload),
-                      std::begin(adapter_payload_copy));
-            payload_size_copy = payload_size_in;
-        }
+                                  sizeof(adapter_payload), &payload_size, 16);
 
-        if (payload_size_copy != sizeof(adapter_payload_copy) ||
-            adapter_payload_copy[0] != LIBUSB_DT_HID) {
-            LOG_ERROR(Input, "error reading payload (size: {}, type: {:02x})", payload_size_copy,
-                      adapter_payload_copy[0]);
+        if (payload_size != sizeof(adapter_payload) || adapter_payload[0] != LIBUSB_DT_HID) {
+            LOG_ERROR(Input,
+                      "Error reading payload (size: {}, type: {:02x}) Is the adapter connected?",
+                      payload_size, adapter_payload[0]);
             adapter_thread_running = false; // error reading from adapter, stop reading.
             break;
         }
         for (std::size_t port = 0; port < pads.size(); ++port) {
-            pads[port] = GetPadStatus(port, adapter_payload_copy);
+            pads[port] = GetPadStatus(port, adapter_payload);
             if (DeviceConnected(port) && configuring) {
-                if (pads[port].button != PAD_GET_ORIGIN) {
+                if (pads[port].button != 0) {
                     pad_queue[port].Push(pads[port]);
                 }
 
-                // Accounting for a threshold here because of some controller variance
-                if (pads[port].stick_x > pads[port].MAIN_STICK_CENTER_X + pads[port].THRESHOLD ||
-                    pads[port].stick_x < pads[port].MAIN_STICK_CENTER_X - pads[port].THRESHOLD) {
-                    pads[port].axis = GCAdapter::PadAxes::StickX;
-                    pads[port].axis_value = pads[port].stick_x;
-                    pad_queue[port].Push(pads[port]);
-                }
-                if (pads[port].stick_y > pads[port].MAIN_STICK_CENTER_Y + pads[port].THRESHOLD ||
-                    pads[port].stick_y < pads[port].MAIN_STICK_CENTER_Y - pads[port].THRESHOLD) {
-                    pads[port].axis = GCAdapter::PadAxes::StickY;
-                    pads[port].axis_value = pads[port].stick_y;
-                    pad_queue[port].Push(pads[port]);
-                }
-                if (pads[port].substick_x > pads[port].C_STICK_CENTER_X + pads[port].THRESHOLD ||
-                    pads[port].substick_x < pads[port].C_STICK_CENTER_X - pads[port].THRESHOLD) {
-                    pads[port].axis = GCAdapter::PadAxes::SubstickX;
-                    pads[port].axis_value = pads[port].substick_x;
-                    pad_queue[port].Push(pads[port]);
-                }
-                if (pads[port].substick_y > pads[port].C_STICK_CENTER_Y + pads[port].THRESHOLD ||
-                    pads[port].substick_y < pads[port].C_STICK_CENTER_Y - pads[port].THRESHOLD) {
-                    pads[port].axis = GCAdapter::PadAxes::SubstickY;
-                    pads[port].axis_value = pads[port].substick_y;
-                    pad_queue[port].Push(pads[port]);
-                }
-                if (pads[port].trigger_left > pads[port].TRIGGER_THRESHOLD) {
-                    pads[port].axis = GCAdapter::PadAxes::TriggerLeft;
-                    pads[port].axis_value = pads[port].trigger_left;
-                    pad_queue[port].Push(pads[port]);
-                }
-                if (pads[port].trigger_right > pads[port].TRIGGER_THRESHOLD) {
-                    pads[port].axis = GCAdapter::PadAxes::TriggerRight;
-                    pads[port].axis_value = pads[port].trigger_right;
-                    pad_queue[port].Push(pads[port]);
+                // Accounting for a threshold here to ensure an intentional press
+                for (size_t i = 0; i < pads[port].axis_values.size(); ++i) {
+                    const u8 value = pads[port].axis_values[i];
+                    const u8 origin = origin_status[port].axis_values[i];
+
+                    if (value > origin + pads[port].THRESHOLD ||
+                        value < origin - pads[port].THRESHOLD) {
+                        pads[port].axis = static_cast<PadAxes>(i);
+                        pads[port].axis_value = pads[port].axis_values[i];
+                        pad_queue[port].Push(pads[port]);
+                    }
                 }
             }
             PadToState(pads[port], state[port]);
@@ -178,42 +144,11 @@ void Adapter::Read() {
     }
 }
 
-void Adapter::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();
-        }
-        std::this_thread::sleep_for(std::chrono::milliseconds(500));
-    }
-}
-
-void Adapter::StartScanThread() {
-    if (detect_thread_running) {
-        return;
-    }
-    if (!libusb_ctx) {
-        return;
-    }
-
-    detect_thread_running = true;
-    detect_thread = std::thread(&Adapter::ScanThreadFunc, this);
-}
-
-void Adapter::StopScanThread() {
-    detect_thread_running = false;
-    detect_thread.join();
-}
-
 void Adapter::Setup() {
-    // Reset the error status in case the adapter gets unplugged
-    if (current_status < 0) {
-        current_status = NO_ADAPTER_DETECTED;
-    }
-
+    // Initialize all controllers as unplugged
     adapter_controllers_status.fill(ControllerTypes::None);
+    // Initialize all ports to store axis origin values
+    get_origin.fill(true);
 
     // pointer to list of connected usb devices
     libusb_device** devices{};
@@ -222,8 +157,6 @@ void Adapter::Setup() {
     const ssize_t device_count = libusb_get_device_list(libusb_ctx, &devices);
     if (device_count < 0) {
         LOG_ERROR(Input, "libusb_get_device_list failed with error: {}", device_count);
-        detect_thread_running = false; // Stop the loop constantly checking for gc adapter
-        // TODO: For hotplug+gc adapter checkbox implementation, revert this.
         return;
     }
 
@@ -321,31 +254,21 @@ void Adapter::GetGCEndpoint(libusb_device* device) {
                               sizeof(clear_payload), nullptr, 16);
 
     adapter_thread_running = true;
-    current_status = ADAPTER_DETECTED;
     adapter_input_thread = std::thread([=] { Read(); }); // Read input
 }
 
 Adapter::~Adapter() {
-    StopScanThread();
     Reset();
 }
 
 void Adapter::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_thread_running = false;
     }
     adapter_input_thread.join();
 
     adapter_controllers_status.fill(ControllerTypes::None);
-    current_status = NO_ADAPTER_DETECTED;
+    get_origin.fill(true);
 
     if (usb_adapter_handle) {
         libusb_release_interface(usb_adapter_handle, 1);
@@ -367,6 +290,7 @@ void Adapter::ResetDeviceType(std::size_t port) {
 }
 
 void Adapter::BeginConfiguration() {
+    get_origin.fill(true);
     for (auto& pq : pad_queue) {
         pq.Clear();
     }
@@ -396,4 +320,8 @@ const std::array<GCState, 4>& Adapter::GetPadState() const {
     return state;
 }
 
+int Adapter::GetOriginValue(int port, int axis) const {
+    return origin_status[port].axis_values[axis];
+}
+
 } // namespace GCAdapter
diff --git a/src/input_common/gcadapter/gc_adapter.h b/src/input_common/gcadapter/gc_adapter.h
index e2cdd6255..bed81915c 100644
--- a/src/input_common/gcadapter/gc_adapter.h
+++ b/src/input_common/gcadapter/gc_adapter.h
@@ -17,12 +17,6 @@ struct libusb_device_handle;
 
 namespace GCAdapter {
 
-enum {
-    PAD_USE_ORIGIN = 0x0080,
-    PAD_GET_ORIGIN = 0x2000,
-    PAD_ERR_STATUS = 0x8000,
-};
-
 enum class PadButton {
     PAD_BUTTON_LEFT = 0x0001,
     PAD_BUTTON_RIGHT = 0x0002,
@@ -53,24 +47,10 @@ enum class PadAxes : u8 {
 };
 
 struct GCPadStatus {
-    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
-
-    static constexpr u8 MAIN_STICK_CENTER_X = 0x80;
-    static constexpr u8 MAIN_STICK_CENTER_Y = 0x80;
-    static constexpr u8 MAIN_STICK_RADIUS = 0x7f;
-    static constexpr u8 C_STICK_CENTER_X = 0x80;
-    static constexpr u8 C_STICK_CENTER_Y = 0x80;
-    static constexpr u8 C_STICK_RADIUS = 0x7f;
-    static constexpr u8 THRESHOLD = 10;
-
-    // 256/4, at least a quarter press to count as a press. For polling mostly
-    static constexpr u8 TRIGGER_THRESHOLD = 64;
+    u16 button{}; // Or-ed PAD_BUTTON_* and PAD_TRIGGER_* bits
+
+    std::array<u8, 6> axis_values{};    // Triggers and sticks, following indices defined in PadAxes
+    static constexpr u8 THRESHOLD = 50; // Threshold for axis press for polling
 
     u8 port{};
     PadAxes axis{PadAxes::Undefined};
@@ -84,11 +64,6 @@ struct GCState {
 
 enum class ControllerTypes { None, Wired, Wireless };
 
-enum {
-    NO_ADAPTER_DETECTED = 0,
-    ADAPTER_DETECTED = 1,
-};
-
 class Adapter {
 public:
     /// Initialize the GC Adapter capture and read sequence
@@ -109,18 +84,14 @@ public:
     std::array<GCState, 4>& GetPadState();
     const std::array<GCState, 4>& GetPadState() const;
 
+    int GetOriginValue(int port, int axis) const;
+
 private:
     GCPadStatus GetPadStatus(std::size_t port, const std::array<u8, 37>& adapter_payload);
 
     void PadToState(const GCPadStatus& pad, GCState& state);
 
     void Read();
-    void ScanThreadFunc();
-    /// Begin scanning for the GC Adapter.
-    void StartScanThread();
-
-    /// Stop scanning for the adapter
-    void StopScanThread();
 
     /// Resets status of device connected to port
     void ResetDeviceType(std::size_t port);
@@ -137,19 +108,11 @@ private:
     /// For use in initialization, querying devices to find the adapter
     void Setup();
 
-    int current_status = NO_ADAPTER_DETECTED;
     libusb_device_handle* usb_adapter_handle = nullptr;
-    std::array<ControllerTypes, 4> adapter_controllers_status{};
-
-    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;
@@ -157,8 +120,11 @@ private:
 
     bool configuring = false;
 
-    std::array<Common::SPSCQueue<GCPadStatus>, 4> pad_queue;
     std::array<GCState, 4> state;
+    std::array<bool, 4> get_origin;
+    std::array<GCPadStatus, 4> origin_status;
+    std::array<Common::SPSCQueue<GCPadStatus>, 4> pad_queue;
+    std::array<ControllerTypes, 4> adapter_controllers_status{};
 };
 
 } // namespace GCAdapter
diff --git a/src/input_common/gcadapter/gc_poller.cpp b/src/input_common/gcadapter/gc_poller.cpp
index b20419ec3..96e22d3ad 100644
--- a/src/input_common/gcadapter/gc_poller.cpp
+++ b/src/input_common/gcadapter/gc_poller.cpp
@@ -38,18 +38,12 @@ public:
     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) {
-        // L/R triggers range is only in positive direction beginning near 0
-        // 0.0 threshold equates to near half trigger press, but threshold accounts for variability.
-        if (axis > 3) {
-            threshold *= -0.5;
-        }
-    }
+          gcadapter(adapter), origin_value(adapter->GetOriginValue(port_, axis_)) {}
 
     bool GetStatus() const override {
         if (gcadapter->DeviceConnected(port)) {
-            const float axis_value =
-                (gcadapter->GetPadState()[port].axes.at(axis) - 128.0f) / 128.0f;
+            const float current_axis_value = gcadapter->GetPadState()[port].axes.at(axis);
+            const float axis_value = (current_axis_value - origin_value) / 128.0f;
             if (trigger_if_greater) {
                 // TODO: Might be worthwile to set a slider for the trigger threshold. It is
                 // currently always set to 0.5 in configure_input_player.cpp ZL/ZR HandleClick
@@ -66,6 +60,7 @@ private:
     float threshold;
     bool trigger_if_greater;
     GCAdapter::Adapter* gcadapter;
+    const float origin_value;
 };
 
 GCButtonFactory::GCButtonFactory(std::shared_ptr<GCAdapter::Adapter> adapter_)
@@ -155,15 +150,18 @@ void GCButtonFactory::EndConfiguration() {
 class GCAnalog final : public Input::AnalogDevice {
 public:
     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) {}
+        : port(port_), axis_x(axis_x_), axis_y(axis_y_), deadzone(deadzone_), gcadapter(adapter),
+          origin_value_x(adapter->GetOriginValue(port_, axis_x_)),
+          origin_value_y(adapter->GetOriginValue(port_, axis_y_)) {}
 
     float GetAxis(int axis) const {
         if (gcadapter->DeviceConnected(port)) {
             std::lock_guard lock{mutex};
+            const auto origin_value = axis % 2 == 0 ? origin_value_x : origin_value_y;
             // 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 (gcadapter->GetPadState()[port].axes.at(axis) - 128.0f) / 95.0f;
+            return (gcadapter->GetPadState()[port].axes.at(axis) - origin_value) / 95.0f;
         }
         return 0.0f;
     }
@@ -215,8 +213,10 @@ private:
     const int axis_x;
     const int axis_y;
     const float deadzone;
-    mutable std::mutex mutex;
     GCAdapter::Adapter* gcadapter;
+    const float origin_value_x;
+    const float origin_value_y;
+    mutable std::mutex mutex;
 };
 
 /// An analog device factory that creates analog devices from GC Adapter