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diff --git a/src/core/frontend/motion_emu.h b/src/core/frontend/motion_emu.h
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+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+#include "common/thread.h"
+#include "common/vector_math.h"
+
+class EmuWindow;
+
+namespace Motion {
+
+class MotionEmu final {
+public:
+ MotionEmu(EmuWindow& emu_window);
+ ~MotionEmu();
+
+ /**
+ * Signals that a motion sensor tilt has begun.
+ * @param x the x-coordinate of the cursor
+ * @param y the y-coordinate of the cursor
+ */
+ void BeginTilt(int x, int y);
+
+ /**
+ * Signals that a motion sensor tilt is occurring.
+ * @param x the x-coordinate of the cursor
+ * @param y the y-coordinate of the cursor
+ */
+ void Tilt(int x, int y);
+
+ /**
+ * Signals that a motion sensor tilt has ended.
+ */
+ void EndTilt();
+
+private:
+ Math::Vec2<int> mouse_origin;
+
+ std::mutex tilt_mutex;
+ Math::Vec2<float> tilt_direction;
+ float tilt_angle = 0;
+
+ bool is_tilting = false;
+
+ Common::Event shutdown_event;
+ std::thread motion_emu_thread;
+
+ void MotionEmuThread(EmuWindow& emu_window);
+};
+
+} // namespace Motion