Frontend: emulate motion sensor

src/core/frontend/motion_emu.h

@@ -0,0 +1,52 @@
+// 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