[core/hle/services/am] nuke ButtonPoller and Mouse thread (#4229)

Signed-off-by: lizzie <lizzie@eden-emu.dev>

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------

doesn't even do anything now, please check if controller i/o is affected by this change
this should also fix latency issues with the mouse
the ButtonPoller thread isn't longer required since we update the state immediately with the .on_change callback registered

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4229
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>

src/core/hle/service/am/button_poller.cpp

@@ -41,7 +41,6 @@ ButtonPoller::ButtonPoller(Core::System& system, WindowSystem& window_system) {
     Core::HID::ControllerUpdateCallback engine_callback{
         .on_change = [this, &window_system](Core::HID::ControllerTriggerType type) {
             if (type == Core::HID::ControllerTriggerType::Button) {
-                std::unique_lock lk{m_mutex};
                 OnButtonStateChanged(window_system);
             }
         },
@@ -52,29 +51,11 @@ ButtonPoller::ButtonPoller(Core::System& system, WindowSystem& window_system) {
     m_handheld_key = m_handheld->SetCallback(engine_callback);
     m_player1 = system.HIDCore().GetEmulatedController(Core::HID::NpadIdType::Player1);
     m_player1_key = m_player1->SetCallback(engine_callback);
-
-    m_thread = std::jthread([this, &window_system](std::stop_token stop_token) {
-        Common::SetCurrentThreadName("ButtonPoller");
-        while (!stop_token.stop_requested()) {
-            using namespace std::chrono_literals;
-            std::unique_lock lk{m_mutex};
-            m_cv.wait_for(lk, 50ms);
-            if (stop_token.stop_requested())
-                break;
-            OnButtonStateChanged(window_system);
-            std::this_thread::sleep_for(5ms);
-        }
-    });
 }
 
 ButtonPoller::~ButtonPoller() {
     m_handheld->DeleteCallback(m_handheld_key);
     m_player1->DeleteCallback(m_player1_key);
-    m_cv.notify_all();
-    if (m_thread.joinable()) {
-        m_thread.request_stop();
-        m_thread.join();
-    }
 }
 
 void ButtonPoller::OnButtonStateChanged(WindowSystem& window_system) {

src/core/hle/service/am/button_poller.h

@@ -33,9 +33,6 @@ public:
     void OnButtonStateChanged(WindowSystem& window_system);
 
 private:
-    std::mutex m_mutex;
-    std::condition_variable m_cv;
-    std::jthread m_thread;
     std::optional<std::chrono::steady_clock::time_point> m_home_button_press_start{};
     std::optional<std::chrono::steady_clock::time_point> m_capture_button_press_start{};
     std::optional<std::chrono::steady_clock::time_point> m_power_button_press_start{};

src/input_common/drivers/mouse.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
@@ -72,15 +72,6 @@ Mouse::Mouse(std::string input_engine_) : InputEngine(std::move(input_engine_))
     wheel_position = {};
     last_mouse_change = {};
     last_motion_change = {};
-
-    update_thread = std::jthread([this](std::stop_token stop_token) {
-        Common::SetCurrentThreadName("Mouse");
-        while (!stop_token.stop_requested()) {
-            UpdateStickInput();
-            UpdateMotionInput();
-            std::this_thread::sleep_for(std::chrono::milliseconds(update_time));
-        }
-    });
 }
 
 void Mouse::UpdateStickInput() {
@@ -185,6 +176,11 @@ void Mouse::Move(int x, int y, int center_x, int center_y) {
     }
 }
 
+void Mouse::NotifyChanged() {
+    UpdateStickInput();
+    UpdateMotionInput();
+}
+
 void Mouse::MouseMove(f32 touch_x, f32 touch_y) {
     SetAxis(real_mouse_identifier, mouse_axis_x, touch_x);
     SetAxis(real_mouse_identifier, mouse_axis_y, touch_y);

src/input_common/drivers/mouse.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
@@ -93,6 +93,9 @@ public:
 
     void ReleaseAllButtons();
 
+    /// @brief Notifies we changed something about the mouse state and we must update
+    void NotifyChanged();
+
     std::vector<Common::ParamPackage> GetInputDevices() const override;
     AnalogMapping GetAnalogMappingForDevice(const Common::ParamPackage& params) override;
     Common::Input::ButtonNames GetUIName(const Common::ParamPackage& params) const override;
@@ -110,7 +113,6 @@ private:
     Common::Vec3<float> last_motion_change;
     Common::Vec2<int> wheel_position;
     bool button_pressed = false;
-    std::jthread update_thread;
 };
 
 } // namespace InputCommon

src/yuzu/bootmanager.cpp

@@ -487,6 +487,7 @@ void GRenderWindow::mousePressEvent(QMouseEvent* event) {
     input_subsystem->GetMouse()->PressMouseButton(button);
     input_subsystem->GetMouse()->PressButton(pos.x(), pos.y(), button);
     input_subsystem->GetMouse()->PressTouchButton(touch_x, touch_y, button);
+    input_subsystem->GetMouse()->NotifyChanged();
 
     emit MouseActivity();
 }
@@ -507,6 +508,7 @@ void GRenderWindow::mouseMoveEvent(QMouseEvent* event) {
     input_subsystem->GetMouse()->MouseMove(touch_x, touch_y);
     input_subsystem->GetMouse()->TouchMove(touch_x, touch_y);
     input_subsystem->GetMouse()->Move(pos.x(), pos.y(), center_x, center_y);
+    input_subsystem->GetMouse()->NotifyChanged();
 
     // Center mouse for mouse panning
     if (Settings::values.mouse_panning && !Settings::values.mouse_enabled) {
@@ -532,6 +534,7 @@ void GRenderWindow::mouseReleaseEvent(QMouseEvent* event) {
 
     const auto button = QtButtonToMouseButton(event->button());
     input_subsystem->GetMouse()->ReleaseButton(button);
+    input_subsystem->GetMouse()->NotifyChanged();
 }
 
 void GRenderWindow::ConstrainMouse() {
@@ -564,6 +567,7 @@ void GRenderWindow::wheelEvent(QWheelEvent* event) {
     const int x = event->angleDelta().x();
     const int y = event->angleDelta().y();
     input_subsystem->GetMouse()->MouseWheelChange(x, y);
+    input_subsystem->GetMouse()->NotifyChanged();
 }
 
 void GRenderWindow::TouchBeginEvent(const QTouchEvent* event) {
@@ -710,8 +714,9 @@ bool GRenderWindow::event(QEvent* event) {
 void GRenderWindow::focusOutEvent(QFocusEvent* event) {
     QWidget::focusOutEvent(event);
     input_subsystem->GetKeyboard()->ReleaseAllKeys();
-    input_subsystem->GetMouse()->ReleaseAllButtons();
     input_subsystem->GetTouchScreen()->ReleaseAllTouch();
+    input_subsystem->GetMouse()->ReleaseAllButtons();
+    input_subsystem->GetMouse()->NotifyChanged();
 }
 
 void GRenderWindow::resizeEvent(QResizeEvent* event) {

src/yuzu/configuration/configure_input_player.cpp

@@ -1546,12 +1546,14 @@ void ConfigureInputPlayer::mousePressEvent(QMouseEvent* event) {
 
     const auto button = GRenderWindow::QtButtonToMouseButton(event->button());
     input_subsystem->GetMouse()->PressButton(0, 0, button);
+    input_subsystem->GetMouse()->NotifyChanged();
 }
 
 void ConfigureInputPlayer::wheelEvent(QWheelEvent* event) {
     const int x = event->angleDelta().x();
     const int y = event->angleDelta().y();
     input_subsystem->GetMouse()->MouseWheelChange(x, y);
+    input_subsystem->GetMouse()->NotifyChanged();
 }
 
 void ConfigureInputPlayer::keyPressEvent(QKeyEvent* event) {

src/yuzu/configuration/configure_ringcon.cpp

@@ -378,6 +378,7 @@ void ConfigureRingController::mousePressEvent(QMouseEvent* event) {
 
     const auto button = GRenderWindow::QtButtonToMouseButton(event->button());
     input_subsystem->GetMouse()->PressButton(0, 0, button);
+    input_subsystem->GetMouse()->NotifyChanged();
 }
 
 void ConfigureRingController::keyPressEvent(QKeyEvent* event) {

src/yuzu_cmd/emu_window/emu_window_sdl3.cpp

@@ -74,6 +74,7 @@ void EmuWindow_SDL3::OnMouseButton(u32 button, u8 state, s32 x, s32 y) {
     } else {
         input_subsystem->GetMouse()->ReleaseButton(mouse_button);
     }
+    input_subsystem->GetMouse()->NotifyChanged();
 }
 
 void EmuWindow_SDL3::OnMouseMotion(s32 x, s32 y) {
@@ -81,6 +82,7 @@ void EmuWindow_SDL3::OnMouseMotion(s32 x, s32 y) {
     input_subsystem->GetMouse()->Move(x, y, 0, 0);
     input_subsystem->GetMouse()->MouseMove(touch_x, touch_y);
     input_subsystem->GetMouse()->TouchMove(touch_x, touch_y);
+    input_subsystem->GetMouse()->NotifyChanged();
 }
 
 void EmuWindow_SDL3::OnFingerDown(float x, float y, std::size_t id) {