3 files changed, 67 insertions, 36 deletions

diff --git a/src/input_common/gcadapter/gc_adapter.cpp b/src/input_common/gcadapter/gc_adapter.cpp
index 38210ffcb..898a278a9 100644
--- a/src/input_common/gcadapter/gc_adapter.cpp
+++ b/src/input_common/gcadapter/gc_adapter.cpp
@@ -25,6 +25,7 @@ Adapter::Adapter() {
     LOG_INFO(Input, "GC Adapter Initialization started");
 
     current_status = NO_ADAPTER_DETECTED;
+    get_origin.fill(true);
 
     const int init_res = libusb_init(&libusb_ctx);
     if (init_res == LIBUSB_SUCCESS) {
@@ -36,13 +37,8 @@ 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;
-    }
-
     adapter_controllers_status[port] = type;
 
     static constexpr std::array<PadButton, 8> b1_buttons{
@@ -58,6 +54,11 @@ GCPadStatus Adapter::GetPadStatus(std::size_t port, const std::array<u8, 37>& ad
         PadButton::PAD_TRIGGER_L,
     };
 
+    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];
@@ -74,16 +75,22 @@ GCPadStatus Adapter::GetPadStatus(std::size_t port, const std::array<u8, 37>& ad
             }
         }
 
-        if (get_origin) {
-            pad.button |= PAD_GET_ORIGIN;
-        }
-
         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].stick_x = pad.stick_x;
+            origin_status[port].stick_y = pad.stick_y;
+            origin_status[port].substick_x = pad.substick_x;
+            origin_status[port].substick_y = pad.substick_y;
+            origin_status[port].trigger_left = pad.trigger_left;
+            origin_status[port].trigger_right = pad.trigger_right;
+            get_origin[port] = false;
+        }
     }
     return pad;
 }
@@ -132,31 +139,31 @@ void Adapter::Read() {
         for (std::size_t port = 0; port < pads.size(); ++port) {
             pads[port] = GetPadStatus(port, adapter_payload_copy);
             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) {
+                if (pads[port].stick_x > origin_status[port].stick_x + pads[port].THRESHOLD ||
+                    pads[port].stick_x < origin_status[port].stick_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) {
+                if (pads[port].stick_y > origin_status[port].stick_y + pads[port].THRESHOLD ||
+                    pads[port].stick_y < origin_status[port].stick_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) {
+                if (pads[port].substick_x > origin_status[port].substick_x + pads[port].THRESHOLD ||
+                    pads[port].substick_x < origin_status[port].substick_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) {
+                if (pads[port].substick_y > origin_status[port].substick_y + pads[port].THRESHOLD ||
+                    pads[port].substick_y < origin_status[port].substick_y - pads[port].THRESHOLD) {
                     pads[port].axis = GCAdapter::PadAxes::SubstickY;
                     pads[port].axis_value = pads[port].substick_y;
                     pad_queue[port].Push(pads[port]);
@@ -237,6 +244,9 @@ void Adapter::Setup() {
         }
         libusb_free_device_list(devices, 1);
     }
+    // Break out of the ScanThreadFunc() loop that is constantly looking for the device
+    // Assumes user has GC adapter plugged in before launch to use the adapter
+    detect_thread_running = false;
 }
 
 bool Adapter::CheckDeviceAccess(libusb_device* device) {
@@ -345,6 +355,7 @@ void Adapter::Reset() {
     adapter_input_thread.join();
 
     adapter_controllers_status.fill(ControllerTypes::None);
+    get_origin.fill(true);
     current_status = NO_ADAPTER_DETECTED;
 
     if (usb_adapter_handle) {
@@ -367,6 +378,7 @@ void Adapter::ResetDeviceType(std::size_t port) {
 }
 
 void Adapter::BeginConfiguration() {
+    get_origin.fill(true);
     for (auto& pq : pad_queue) {
         pq.Clear();
     }
@@ -396,4 +408,25 @@ const std::array<GCState, 4>& Adapter::GetPadState() const {
     return state;
 }
 
+int Adapter::GetOriginValue(int port, int axis) const {
+    const auto& status = origin_status[port];
+
+    switch (static_cast<PadAxes>(axis)) {
+    case PadAxes::StickX:
+        return status.stick_x;
+    case PadAxes::StickY:
+        return status.stick_y;
+    case PadAxes::SubstickX:
+        return status.substick_x;
+    case PadAxes::SubstickY:
+        return status.substick_y;
+    case PadAxes::TriggerLeft:
+        return status.trigger_left;
+    case PadAxes::TriggerRight:
+        return status.trigger_right;
+    default:
+        return 0;
+    }
+}
+
 } // namespace GCAdapter
diff --git a/src/input_common/gcadapter/gc_adapter.h b/src/input_common/gcadapter/gc_adapter.h
index e2cdd6255..3586c8bda 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,
@@ -109,6 +103,8 @@ 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);
 
@@ -159,6 +155,8 @@ private:
 
     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;
 };
 
 } // 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