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diff --git a/src/core/frontend/emu_window.h b/src/core/frontend/emu_window.h
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+++ b/src/core/frontend/emu_window.h
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+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <tuple>
+#include <utility>
+#include "common/common_types.h"
+#include "common/framebuffer_layout.h"
+#include "common/math_util.h"
+#include "core/hle/service/hid/hid.h"
+
+/**
+ * Abstraction class used to provide an interface between emulation code and the frontend
+ * (e.g. SDL, QGLWidget, GLFW, etc...).
+ *
+ * Design notes on the interaction between EmuWindow and the emulation core:
+ * - Generally, decisions on anything visible to the user should be left up to the GUI.
+ *   For example, the emulation core should not try to dictate some window title or size.
+ *   This stuff is not the core's business and only causes problems with regards to thread-safety
+ *   anyway.
+ * - Under certain circumstances, it may be desirable for the core to politely request the GUI
+ *   to set e.g. a minimum window size. However, the GUI should always be free to ignore any
+ *   such hints.
+ * - EmuWindow may expose some of its state as read-only to the emulation core, however care
+ *   should be taken to make sure the provided information is self-consistent. This requires
+ *   some sort of synchronization (most of this is still a TODO).
+ * - DO NOT TREAT THIS CLASS AS A GUI TOOLKIT ABSTRACTION LAYER. That's not what it is. Please
+ *   re-read the upper points again and think about it if you don't see this.
+ */
+class EmuWindow {
+public:
+    /// Data structure to store emuwindow configuration
+    struct WindowConfig {
+        bool fullscreen;
+        int res_width;
+        int res_height;
+        std::pair<unsigned, unsigned> min_client_area_size;
+    };
+
+    /// Swap buffers to display the next frame
+    virtual void SwapBuffers() = 0;
+
+    /// Polls window events
+    virtual void PollEvents() = 0;
+
+    /// Makes the graphics context current for the caller thread
+    virtual void MakeCurrent() = 0;
+
+    /// Releases (dunno if this is the "right" word) the GLFW context from the caller thread
+    virtual void DoneCurrent() = 0;
+
+    virtual void ReloadSetKeymaps() = 0;
+
+    /**
+     * Signals a button press action to the HID module.
+     * @param pad_state indicates which button to press
+     * @note only handles real buttons (A/B/X/Y/...), excluding analog inputs like the circle pad.
+     */
+    void ButtonPressed(Service::HID::PadState pad_state);
+
+    /**
+     * Signals a button release action to the HID module.
+     * @param pad_state indicates which button to press
+     * @note only handles real buttons (A/B/X/Y/...), excluding analog inputs like the circle pad.
+     */
+    void ButtonReleased(Service::HID::PadState pad_state);
+
+    /**
+     * Signals a circle pad change action to the HID module.
+     * @param x new x-coordinate of the circle pad, in the range [-1.0, 1.0]
+     * @param y new y-coordinate of the circle pad, in the range [-1.0, 1.0]
+     * @note the coordinates will be normalized if the radius is larger than 1
+     */
+    void CirclePadUpdated(float x, float y);
+
+    /**
+     * Signal that a touch pressed event has occurred (e.g. mouse click pressed)
+     * @param framebuffer_x Framebuffer x-coordinate that was pressed
+     * @param framebuffer_y Framebuffer y-coordinate that was pressed
+     */
+    void TouchPressed(unsigned framebuffer_x, unsigned framebuffer_y);
+
+    /// Signal that a touch released event has occurred (e.g. mouse click released)
+    void TouchReleased();
+
+    /**
+     * Signal that a touch movement event has occurred (e.g. mouse was moved over the emu window)
+     * @param framebuffer_x Framebuffer x-coordinate
+     * @param framebuffer_y Framebuffer y-coordinate
+     */
+    void TouchMoved(unsigned framebuffer_x, unsigned framebuffer_y);
+
+    /**
+     * Gets the current pad state (which buttons are pressed).
+     * @note This should be called by the core emu thread to get a state set by the window thread.
+     * @note This doesn't include analog input like circle pad direction
+     * @todo Fix this function to be thread-safe.
+     * @return PadState object indicating the current pad state
+     */
+    Service::HID::PadState GetPadState() const {
+        return pad_state;
+    }
+
+    /**
+     * Gets the current circle pad state.
+     * @note This should be called by the core emu thread to get a state set by the window thread.
+     * @todo Fix this function to be thread-safe.
+     * @return std::tuple of (x, y), where `x` and `y` are the circle pad coordinates
+     */
+    std::tuple<s16, s16> GetCirclePadState() const {
+        return std::make_tuple(circle_pad_x, circle_pad_y);
+    }
+
+    /**
+     * Gets the current touch screen state (touch X/Y coordinates and whether or not it is pressed).
+     * @note This should be called by the core emu thread to get a state set by the window thread.
+     * @todo Fix this function to be thread-safe.
+     * @return std::tuple of (x, y, pressed) where `x` and `y` are the touch coordinates and
+     *         `pressed` is true if the touch screen is currently being pressed
+     */
+    std::tuple<u16, u16, bool> GetTouchState() const {
+        return std::make_tuple(touch_x, touch_y, touch_pressed);
+    }
+
+    /**
+     * Gets the current accelerometer state (acceleration along each three axis).
+     * Axis explained:
+     *   +x is the same direction as LEFT on D-pad.
+     *   +y is normal to the touch screen, pointing outward.
+     *   +z is the same direction as UP on D-pad.
+     * Units:
+     *   1 unit of return value = 1/512 g (measured by hw test),
+     *   where g is the gravitational acceleration (9.8 m/sec2).
+     * @note This should be called by the core emu thread to get a state set by the window thread.
+     * @todo Implement accelerometer input in front-end.
+     * @return std::tuple of (x, y, z)
+     */
+    std::tuple<s16, s16, s16> GetAccelerometerState() const {
+        // stubbed
+        return std::make_tuple(0, -512, 0);
+    }
+
+    /**
+     * Gets the current gyroscope state (angular rates about each three axis).
+     * Axis explained:
+     *   +x is the same direction as LEFT on D-pad.
+     *   +y is normal to the touch screen, pointing outward.
+     *   +z is the same direction as UP on D-pad.
+     * Orientation is determined by right-hand rule.
+     * Units:
+     *   1 unit of return value = (1/coef) deg/sec,
+     *   where coef is the return value of GetGyroscopeRawToDpsCoefficient().
+     * @note This should be called by the core emu thread to get a state set by the window thread.
+     * @todo Implement gyroscope input in front-end.
+     * @return std::tuple of (x, y, z)
+     */
+    std::tuple<s16, s16, s16> GetGyroscopeState() const {
+        // stubbed
+        return std::make_tuple(0, 0, 0);
+    }
+
+    /**
+     * Gets the coefficient for units conversion of gyroscope state.
+     * The conversion formula is r = coefficient * v,
+     * where v is angular rate in deg/sec,
+     * and r is the gyroscope state.
+     * @return float-type coefficient
+     */
+    f32 GetGyroscopeRawToDpsCoefficient() const {
+        return 14.375f; // taken from hw test, and gyroscope's document
+    }
+
+    /**
+     * Returns currently active configuration.
+     * @note Accesses to the returned object need not be consistent because it may be modified in
+     * another thread
+     */
+    const WindowConfig& GetActiveConfig() const {
+        return active_config;
+    }
+
+    /**
+     * Requests the internal configuration to be replaced by the specified argument at some point in
+     * the future.
+     * @note This method is thread-safe, because it delays configuration changes to the GUI event
+     * loop. Hence there is no guarantee on when the requested configuration will be active.
+     */
+    void SetConfig(const WindowConfig& val) {
+        config = val;
+    }
+
+    /**
+      * Gets the framebuffer layout (width, height, and screen regions)
+      * @note This method is thread-safe
+      */
+    const Layout::FramebufferLayout& GetFramebufferLayout() const {
+        return framebuffer_layout;
+    }
+
+    /**
+     * Convenience method to update the current frame layout
+     * Read from the current settings to determine which layout to use.
+     */
+    void UpdateCurrentFramebufferLayout(unsigned width, unsigned height);
+
+protected:
+    EmuWindow() {
+        // TODO: Find a better place to set this.
+        config.min_client_area_size = std::make_pair(400u, 480u);
+        active_config = config;
+        pad_state.hex = 0;
+        touch_x = 0;
+        touch_y = 0;
+        circle_pad_x = 0;
+        circle_pad_y = 0;
+        touch_pressed = false;
+    }
+    virtual ~EmuWindow() {}
+
+    /**
+     * Processes any pending configuration changes from the last SetConfig call.
+     * This method invokes OnMinimalClientAreaChangeRequest if the corresponding configuration
+     * field changed.
+     * @note Implementations will usually want to call this from the GUI thread.
+     * @todo Actually call this in existing implementations.
+     */
+    void ProcessConfigurationChanges() {
+        // TODO: For proper thread safety, we should eventually implement a proper
+        // multiple-writer/single-reader queue...
+
+        if (config.min_client_area_size != active_config.min_client_area_size) {
+            OnMinimalClientAreaChangeRequest(config.min_client_area_size);
+            config.min_client_area_size = active_config.min_client_area_size;
+        }
+    }
+
+    /**
+     * Update framebuffer layout with the given parameter.
+     * @note EmuWindow implementations will usually use this in window resize event handlers.
+     */
+    void NotifyFramebufferLayoutChanged(const Layout::FramebufferLayout& layout) {
+        framebuffer_layout = layout;
+    }
+
+    /**
+     * Update internal client area size with the given parameter.
+     * @note EmuWindow implementations will usually use this in window resize event handlers.
+     */
+    void NotifyClientAreaSizeChanged(const std::pair<unsigned, unsigned>& size) {
+        client_area_width = size.first;
+        client_area_height = size.second;
+    }
+
+private:
+    /**
+     * Handler called when the minimal client area was requested to be changed via SetConfig.
+     * For the request to be honored, EmuWindow implementations will usually reimplement this
+     * function.
+     */
+    virtual void OnMinimalClientAreaChangeRequest(
+        const std::pair<unsigned, unsigned>& minimal_size) {
+        // By default, ignore this request and do nothing.
+    }
+
+    Layout::FramebufferLayout framebuffer_layout; ///< Current framebuffer layout
+
+    unsigned client_area_width;  ///< Current client width, should be set by window impl.
+    unsigned client_area_height; ///< Current client height, should be set by window impl.
+
+    WindowConfig config;        ///< Internal configuration (changes pending for being applied in
+                                /// ProcessConfigurationChanges)
+    WindowConfig active_config; ///< Internal active configuration
+
+    bool touch_pressed; ///< True if touchpad area is currently pressed, otherwise false
+
+    u16 touch_x; ///< Touchpad X-position in native 3DS pixel coordinates (0-320)
+    u16 touch_y; ///< Touchpad Y-position in native 3DS pixel coordinates (0-240)
+
+    s16 circle_pad_x; ///< Circle pad X-position in native 3DS pixel coordinates (-156 - 156)
+    s16 circle_pad_y; ///< Circle pad Y-position in native 3DS pixel coordinates (-156 - 156)
+
+    /**
+     * Clip the provided coordinates to be inside the touchscreen area.
+     */
+    std::tuple<unsigned, unsigned> ClipToTouchScreen(unsigned new_x, unsigned new_y);
+
+    Service::HID::PadState pad_state;
+};