12 files changed, 405 insertions, 39 deletions

diff --git a/src/citra/emu_window/emu_window_glfw.cpp b/src/citra/emu_window/emu_window_glfw.cpp
index 02f524e03..b911e60c5 100644
--- a/src/citra/emu_window/emu_window_glfw.cpp
+++ b/src/citra/emu_window/emu_window_glfw.cpp
@@ -8,18 +8,55 @@
 
 #include "citra/emu_window/emu_window_glfw.h"
 
-static void OnKeyEvent(GLFWwindow* win, int key, int action) {
-    // TODO(bunnei): ImplementMe
-}
+static const std::pair<int, HID_User::PadState> default_key_map[] = {
+    { GLFW_KEY_A, HID_User::PAD_A },
+    { GLFW_KEY_B, HID_User::PAD_B },
+    { GLFW_KEY_BACKSLASH, HID_User::PAD_SELECT },
+    { GLFW_KEY_ENTER, HID_User::PAD_START },
+    { GLFW_KEY_RIGHT, HID_User::PAD_RIGHT },
+    { GLFW_KEY_LEFT, HID_User::PAD_LEFT },
+    { GLFW_KEY_UP, HID_User::PAD_UP },
+    { GLFW_KEY_DOWN, HID_User::PAD_DOWN },
+    { GLFW_KEY_R, HID_User::PAD_R },
+    { GLFW_KEY_L, HID_User::PAD_L },
+    { GLFW_KEY_X, HID_User::PAD_X },
+    { GLFW_KEY_Y, HID_User::PAD_Y },
+    { GLFW_KEY_H, HID_User::PAD_CIRCLE_RIGHT },
+    { GLFW_KEY_F, HID_User::PAD_CIRCLE_LEFT },
+    { GLFW_KEY_T, HID_User::PAD_CIRCLE_UP },
+    { GLFW_KEY_G, HID_User::PAD_CIRCLE_DOWN },
+};
+
+/// Called by GLFW when a key event occurs
+void EmuWindow_GLFW::OnKeyEvent(GLFWwindow* win, int key, int scancode, int action, int mods) {
+
+    if (!VideoCore::g_emu_window) {
+        return;
+    }
+
+    int keyboard_id = ((EmuWindow_GLFW*)VideoCore::g_emu_window)->keyboard_id;
+
+    if (action == GLFW_PRESS) {
+        EmuWindow::KeyPressed({key, keyboard_id});
+    }
 
-static void OnWindowSizeEvent(GLFWwindow* win, int width, int height) {
-    EmuWindow_GLFW* emu_window = (EmuWindow_GLFW*)glfwGetWindowUserPointer(win);
-    emu_window->SetClientAreaWidth(width);
-    emu_window->SetClientAreaHeight(height);
+    if (action == GLFW_RELEASE) {
+        EmuWindow::KeyReleased({key, keyboard_id});
+    }
+    HID_User::PadUpdateComplete();
 }
 
 /// EmuWindow_GLFW constructor
 EmuWindow_GLFW::EmuWindow_GLFW() {
+
+    // Register a new ID for the default keyboard
+    keyboard_id = KeyMap::NewDeviceId();
+
+    // Set default key mappings for keyboard
+    for (auto mapping : default_key_map) {
+        KeyMap::SetKeyMapping({mapping.first, keyboard_id}, mapping.second);
+    }
+
     // Initialize the window
     if(glfwInit() != GL_TRUE) {
         printf("Failed to initialize GLFW! Exiting...");
@@ -45,8 +82,7 @@ EmuWindow_GLFW::EmuWindow_GLFW() {
     
     // Setup callbacks
     glfwSetWindowUserPointer(m_render_window, this);
-    //glfwSetKeyCallback(m_render_window, OnKeyEvent);
-    //glfwSetWindowSizeCallback(m_render_window, OnWindowSizeEvent);
+    glfwSetKeyCallback(m_render_window, OnKeyEvent);
 
     DoneCurrent();
 }
diff --git a/src/citra/emu_window/emu_window_glfw.h b/src/citra/emu_window/emu_window_glfw.h
index c1b41203b..29325bb75 100644
--- a/src/citra/emu_window/emu_window_glfw.h
+++ b/src/citra/emu_window/emu_window_glfw.h
@@ -25,8 +25,9 @@ public:
     /// Releases (dunno if this is the "right" word) the GLFW context from the caller thread
     void DoneCurrent();
 
-	GLFWwindow* m_render_window;    ///< Internal GLFW render window
+    static void OnKeyEvent(GLFWwindow* win, int key, int scancode, int action, int mods);
 
 private:
-
+    GLFWwindow* m_render_window; ///< Internal GLFW render window
+    int keyboard_id;             ///< Device id of keyboard for use with KeyMap
 };
diff --git a/src/citra_qt/bootmanager.cpp b/src/citra_qt/bootmanager.cpp
index 573060d30..657e39bea 100644
--- a/src/citra_qt/bootmanager.cpp
+++ b/src/citra_qt/bootmanager.cpp
@@ -109,8 +109,35 @@ EmuThread& GRenderWindow::GetEmuThread()
     return emu_thread;
 }
 
+static const std::pair<int, HID_User::PadState> default_key_map[] = {
+    { Qt::Key_A, HID_User::PAD_A },
+    { Qt::Key_B, HID_User::PAD_B },
+    { Qt::Key_Backslash, HID_User::PAD_SELECT },
+    { Qt::Key_Enter, HID_User::PAD_START },
+    { Qt::Key_Right, HID_User::PAD_RIGHT },
+    { Qt::Key_Left, HID_User::PAD_LEFT },
+    { Qt::Key_Up, HID_User::PAD_UP },
+    { Qt::Key_Down, HID_User::PAD_DOWN },
+    { Qt::Key_R, HID_User::PAD_R },
+    { Qt::Key_L, HID_User::PAD_L },
+    { Qt::Key_X, HID_User::PAD_X },
+    { Qt::Key_Y, HID_User::PAD_Y },
+    { Qt::Key_H, HID_User::PAD_CIRCLE_RIGHT },
+    { Qt::Key_F, HID_User::PAD_CIRCLE_LEFT },
+    { Qt::Key_T, HID_User::PAD_CIRCLE_UP },
+    { Qt::Key_G, HID_User::PAD_CIRCLE_DOWN },
+};
+
 GRenderWindow::GRenderWindow(QWidget* parent) : QWidget(parent), emu_thread(this)
 {
+    // Register a new ID for the default keyboard
+    keyboard_id = KeyMap::NewDeviceId();
+
+    // Set default key mappings for keyboard
+    for (auto mapping : default_key_map) {
+        KeyMap::SetKeyMapping({mapping.first, keyboard_id}, mapping.second);
+    }
+
     // TODO: One of these flags might be interesting: WA_OpaquePaintEvent, WA_NoBackground, WA_DontShowOnScreen, WA_DeleteOnClose
     QGLFormat fmt;
     fmt.setProfile(QGLFormat::CoreProfile);
@@ -209,27 +236,13 @@ QByteArray GRenderWindow::saveGeometry()
 
 void GRenderWindow::keyPressEvent(QKeyEvent* event)
 {
-    /*
-    bool key_processed = false;
-    for (unsigned int channel = 0; channel < 4 && controller_interface(); ++channel)
-        if (controller_interface()->SetControllerStatus(channel, event->key(), input_common::GCController::PRESSED))
-            key_processed = true;
-
-    if (!key_processed)
-        QWidget::keyPressEvent(event);
-    */
+    EmuWindow::KeyPressed({event->key(), keyboard_id});
+    HID_User::PadUpdateComplete();
 }
 
 void GRenderWindow::keyReleaseEvent(QKeyEvent* event)
 {
-    /*
-    bool key_processed = false;
-    for (unsigned int channel = 0; channel < 4 && controller_interface(); ++channel)
-        if (controller_interface()->SetControllerStatus(channel, event->key(), input_common::GCController::RELEASED))
-            key_processed = true;
-
-    if (!key_processed)
-        QWidget::keyPressEvent(event);
-    */
+    EmuWindow::KeyReleased({event->key(), keyboard_id});
+    HID_User::PadUpdateComplete();
 }
 
diff --git a/src/citra_qt/bootmanager.hxx b/src/citra_qt/bootmanager.hxx
index 51cb781e9..eedf19471 100644
--- a/src/citra_qt/bootmanager.hxx
+++ b/src/citra_qt/bootmanager.hxx
@@ -116,4 +116,6 @@ private:
     EmuThread emu_thread;
 
     QByteArray geometry;
+
+    int keyboard_id;
 };
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 3a82f5b80..9d5a90762 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -4,10 +4,12 @@ configure_file("${CMAKE_CURRENT_SOURCE_DIR}/scm_rev.cpp.in" "${CMAKE_CURRENT_SOU
 set(SRCS
             break_points.cpp
             console_listener.cpp
+            emu_window.cpp
             extended_trace.cpp
             file_search.cpp
             file_util.cpp
             hash.cpp
+            key_map.cpp
             log_manager.cpp
             math_util.cpp
             mem_arena.cpp
@@ -39,6 +41,7 @@ set(HEADERS
             file_search.h
             file_util.h
             hash.h
+            key_map.h
             linear_disk_cache.h
             log.h
             log_manager.h
diff --git a/src/common/emu_window.cpp b/src/common/emu_window.cpp
new file mode 100644
index 000000000..7a2c50ac8
--- /dev/null
+++ b/src/common/emu_window.cpp
@@ -0,0 +1,17 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include "emu_window.h"
+
+void EmuWindow::KeyPressed(KeyMap::HostDeviceKey key) {
+    HID_User::PadState mapped_key = KeyMap::GetPadKey(key);
+
+    HID_User::PadButtonPress(mapped_key);
+}
+
+void EmuWindow::KeyReleased(KeyMap::HostDeviceKey key) {
+    HID_User::PadState mapped_key = KeyMap::GetPadKey(key);
+
+    HID_User::PadButtonRelease(mapped_key);
+}
diff --git a/src/common/emu_window.h b/src/common/emu_window.h
index 5e2c33d7a..23f178fdf 100644
--- a/src/common/emu_window.h
+++ b/src/common/emu_window.h
@@ -7,6 +7,8 @@
 #include "common/common.h"
 #include "common/scm_rev.h"
 
+#include "common/key_map.h"
+
 // Abstraction class used to provide an interface between emulation code and the frontend (e.g. SDL, 
 //  QGLWidget, GLFW, etc...)
 class EmuWindow
@@ -32,6 +34,12 @@ public:
     /// Releases (dunno if this is the "right" word) the GLFW context from the caller thread
     virtual void DoneCurrent() = 0;
 
+    /// Signals a key press action to the HID module
+    static void KeyPressed(KeyMap::HostDeviceKey key);
+
+    /// Signals a key release action to the HID module
+    static void KeyReleased(KeyMap::HostDeviceKey key);
+
     Config GetConfig() const { 
         return m_config;
     }
diff --git a/src/common/key_map.cpp b/src/common/key_map.cpp
new file mode 100644
index 000000000..309caab98
--- /dev/null
+++ b/src/common/key_map.cpp
@@ -0,0 +1,25 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include "key_map.h"
+#include <map>
+
+namespace KeyMap {
+
+static std::map<HostDeviceKey, HID_User::PadState> key_map;
+static int next_device_id = 0;
+
+int NewDeviceId() {
+    return next_device_id++;
+}
+
+void SetKeyMapping(HostDeviceKey key, HID_User::PadState padState) {
+    key_map[key].hex = padState.hex;
+}
+
+HID_User::PadState GetPadKey(HostDeviceKey key) {
+    return key_map[key];
+}
+
+}
diff --git a/src/common/key_map.h b/src/common/key_map.h
new file mode 100644
index 000000000..b5acfbab0
--- /dev/null
+++ b/src/common/key_map.h
@@ -0,0 +1,45 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "core/hle/service/hid.h"
+
+namespace KeyMap {
+
+/**
+ * Represents a key for a specific host device.
+ */
+struct HostDeviceKey {
+    int key_code;
+    int device_id; ///< Uniquely identifies a host device
+
+    bool operator < (const HostDeviceKey &other) const {
+        if (device_id == other.device_id) {
+            return key_code < other.key_code;
+        }
+        return device_id < other.device_id;
+    }
+
+    bool operator == (const HostDeviceKey &other) const {
+        return device_id == other.device_id && key_code == other.key_code;
+    }
+};
+
+/**
+ * Generates a new device id, which uniquely identifies a host device within KeyMap.
+ */
+int NewDeviceId();
+
+/**
+ * Maps a device-specific key to a PadState.
+ */
+void SetKeyMapping(HostDeviceKey key, HID_User::PadState padState);
+
+/**
+ * Gets the PadState that's mapped to the provided device-specific key.
+ */
+HID_User::PadState GetPadKey(HostDeviceKey key);
+
+}
diff --git a/src/core/hle/service/hid.cpp b/src/core/hle/service/hid.cpp
index 4e470795f..b6ec1b8ff 100644
--- a/src/core/hle/service/hid.cpp
+++ b/src/core/hle/service/hid.cpp
@@ -14,7 +14,128 @@
 
 namespace HID_User {
 
-Handle g_shared_mem = 0; ///< Handle to shared memory region designated to HID_User service
+// Handle to shared memory region designated to HID_User service
+static Handle shared_mem = 0;
+
+// Event handles
+static Handle event_pad_or_touch_1 = 0;
+static Handle event_pad_or_touch_2 = 0;
+static Handle event_accelerometer = 0;
+static Handle event_gyroscope = 0;
+static Handle event_debug_pad = 0;
+
+// Next Pad state update information
+static PadState next_state = {{0}};
+static u32 next_index = 0;
+static s16 next_circle_x = 0;
+static s16 next_circle_y = 0;
+
+/**
+ * Gets a pointer to the PadData structure inside HID shared memory
+ */
+static inline PadData* GetPadData() {
+    if (0 == shared_mem)
+        return nullptr;
+
+    return reinterpret_cast<PadData*>(Kernel::GetSharedMemoryPointer(shared_mem, 0));
+}
+
+/**
+ * Circle Pad from keys.
+ *
+ * This is implemented as "pushed all the way to an edge (max) or centered (0)".
+ *
+ * Indicate the circle pad is pushed completely to the edge in 1 of 8 directions.
+ */
+void UpdateNextCirclePadState() {
+    static const s16 max_value = 0x9C;
+    next_circle_x = next_state.circle_left ? -max_value : 0x0;
+    next_circle_x += next_state.circle_right ? max_value : 0x0;
+    next_circle_y = next_state.circle_down ? -max_value : 0x0;
+    next_circle_y += next_state.circle_up ? max_value : 0x0;
+}
+
+/**
+ * Sets a Pad state (button or button combo) as pressed
+ */
+void PadButtonPress(PadState pad_state) {
+    next_state.hex |= pad_state.hex;
+    UpdateNextCirclePadState();
+}
+
+/**
+ * Sets a Pad state (button or button combo) as released
+ */
+void PadButtonRelease(PadState pad_state) {
+    next_state.hex &= ~pad_state.hex;
+    UpdateNextCirclePadState();
+}
+
+/**
+ * Called after all Pad changes to be included in this update have been made,
+ * including both Pad key changes and analog circle Pad changes.
+ */
+void PadUpdateComplete() {
+    PadData* pad_data = GetPadData();
+
+    // Update PadData struct
+    pad_data->current_state.hex = next_state.hex;
+    pad_data->index = next_index;
+    next_index = (next_index + 1) % pad_data->entries.size();
+
+    // Get the previous Pad state
+    u32 last_entry_index = (pad_data->index - 1) % pad_data->entries.size();
+    PadState old_state = pad_data->entries[last_entry_index].current_state;
+
+    // Compute bitmask with 1s for bits different from the old state
+    PadState changed;
+    changed.hex = (next_state.hex ^ old_state.hex);
+
+    // Compute what was added
+    PadState additions;
+    additions.hex = changed.hex & next_state.hex;
+
+    // Compute what was removed
+    PadState removals;
+    removals.hex = changed.hex & old_state.hex;
+
+    // Get the current Pad entry
+    PadDataEntry* current_pad_entry = &pad_data->entries[pad_data->index];
+
+    // Update entry properties
+    current_pad_entry->current_state.hex = next_state.hex;
+    current_pad_entry->delta_additions.hex = additions.hex;
+    current_pad_entry->delta_removals.hex = removals.hex;
+
+    // Set circle Pad
+    current_pad_entry->circle_pad_x = next_circle_x;
+    current_pad_entry->circle_pad_y = next_circle_y;
+
+    // If we just updated index 0, provide a new timestamp
+    if (pad_data->index == 0) {
+        pad_data->index_reset_ticks_previous = pad_data->index_reset_ticks;
+        pad_data->index_reset_ticks = (s64)Core::g_app_core->GetTicks();
+    }
+
+    // Signal both handles when there's an update to Pad or touch
+    Kernel::SignalEvent(event_pad_or_touch_1);
+    Kernel::SignalEvent(event_pad_or_touch_2);
+}
+
+
+// TODO(peachum):
+// Add a method for setting analog input from joystick device for the circle Pad.
+//
+// This method should:
+//     * Be called after both PadButton<Press, Release>().
+//     * Be called before PadUpdateComplete()
+//     * Set current PadEntry.circle_pad_<axis> using analog data
+//     * Set PadData.raw_circle_pad_data
+//     * Set PadData.current_state.circle_right = 1 if current PadEntry.circle_pad_x >= 41
+//     * Set PadData.current_state.circle_up = 1 if current PadEntry.circle_pad_y >= 41
+//     * Set PadData.current_state.circle_left = 1 if current PadEntry.circle_pad_x <= -41
+//     * Set PadData.current_state.circle_right = 1 if current PadEntry.circle_pad_y <= -41
+
 
 /**
  * HID_User::GetIPCHandles service function
@@ -34,12 +155,12 @@ void GetIPCHandles(Service::Interface* self) {
     u32* cmd_buff = Service::GetCommandBuffer();
 
     cmd_buff[1] = 0; // No error
-    cmd_buff[3] = g_shared_mem;
-    cmd_buff[4] = Kernel::CreateEvent(RESETTYPE_ONESHOT, "HID_User:EventA");
-    cmd_buff[5] = Kernel::CreateEvent(RESETTYPE_ONESHOT, "HID_User:EventB");
-    cmd_buff[6] = Kernel::CreateEvent(RESETTYPE_ONESHOT, "HID_User:EventC");
-    cmd_buff[7] = Kernel::CreateEvent(RESETTYPE_ONESHOT, "HID_User:EventGyroscope");
-    cmd_buff[8] = Kernel::CreateEvent(RESETTYPE_ONESHOT, "HID_User:EventD");
+    cmd_buff[3] = shared_mem;
+    cmd_buff[4] = event_pad_or_touch_1;
+    cmd_buff[5] = event_pad_or_touch_2;
+    cmd_buff[6] = event_accelerometer;
+    cmd_buff[7] = event_gyroscope;
+    cmd_buff[8] = event_debug_pad;
 
     DEBUG_LOG(KERNEL, "called");
 }
@@ -57,11 +178,19 @@ const Interface::FunctionInfo FunctionTable[] = {
     {0x00170000, nullptr,       "GetSoundVolume"},
 };
 
+
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // Interface class
 
 Interface::Interface() {
-    g_shared_mem = Kernel::CreateSharedMemory("HID_User:SharedMem"); // Create shared memory object
+    shared_mem = Kernel::CreateSharedMemory("HID_User:SharedMem"); // Create shared memory object
+
+    // Create event handles
+    event_pad_or_touch_1 = Kernel::CreateEvent(RESETTYPE_ONESHOT, "HID_User:EventPadOrTouch1");
+    event_pad_or_touch_2 = Kernel::CreateEvent(RESETTYPE_ONESHOT, "HID_User:EventPadOrTouch2");
+    event_accelerometer = Kernel::CreateEvent(RESETTYPE_ONESHOT, "HID_User:EventAccelerometer");
+    event_gyroscope = Kernel::CreateEvent(RESETTYPE_ONESHOT, "HID_User:EventGyroscope");
+    event_debug_pad = Kernel::CreateEvent(RESETTYPE_ONESHOT, "HID_User:EventDebugPad");
 
     Register(FunctionTable, ARRAY_SIZE(FunctionTable));
 }
diff --git a/src/core/hle/service/hid.h b/src/core/hle/service/hid.h
index b17fcfa86..a077e25cd 100644
--- a/src/core/hle/service/hid.h
+++ b/src/core/hle/service/hid.h
@@ -5,15 +5,101 @@
 #pragma once
 
 #include "core/hle/service/service.h"
+#include "common/bit_field.h"
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // Namespace HID_User
 
-// This service is used for interfacing to physical user controls... perhaps "Human Interface 
-// Devices"? Uses include game pad controls, accelerometers, gyroscopes, etc.
+// This service is used for interfacing to physical user controls.
+// Uses include game pad controls, touchscreen, accelerometers, gyroscopes, and debug pad.
 
 namespace HID_User {
 
+/** 
+ * Structure of a Pad controller state.
+ */
+struct PadState {
+    union {
+        u32 hex;
+
+        BitField<0, 1, u32> a;
+        BitField<1, 1, u32> b;
+        BitField<2, 1, u32> select;
+        BitField<3, 1, u32> start;
+        BitField<4, 1, u32> right;
+        BitField<5, 1, u32> left;
+        BitField<6, 1, u32> up;
+        BitField<7, 1, u32> down;
+        BitField<8, 1, u32> r;
+        BitField<9, 1, u32> l;
+        BitField<10, 1, u32> x;
+        BitField<11, 1, u32> y;
+
+        BitField<28, 1, u32> circle_right;
+        BitField<29, 1, u32> circle_left;
+        BitField<30, 1, u32> circle_up;
+        BitField<31, 1, u32> circle_down;
+    };
+};
+
+/**
+ * Structure of a single entry in the PadData's Pad state history array.
+ */
+struct PadDataEntry {
+    PadState current_state;
+    PadState delta_additions;
+    PadState delta_removals;
+
+    s16 circle_pad_x;
+    s16 circle_pad_y;
+};
+
+/**
+ * Structure of all data related to the 3DS Pad.
+ */
+struct PadData {
+    s64 index_reset_ticks;
+    s64 index_reset_ticks_previous;
+    u32 index; // the index of the last updated Pad state history element
+
+    u32 pad1;
+    u32 pad2;
+
+    PadState current_state; // same as entries[index].current_state
+    u32 raw_circle_pad_data;
+
+    u32 pad3;
+
+    std::array<PadDataEntry, 8> entries; // Pad state history
+};
+
+// Pre-defined PadStates for single button presses
+const PadState PAD_NONE         = {{0}};
+const PadState PAD_A            = {{1u << 0}};
+const PadState PAD_B            = {{1u << 1}};
+const PadState PAD_SELECT       = {{1u << 2}};
+const PadState PAD_START        = {{1u << 3}};
+const PadState PAD_RIGHT        = {{1u << 4}};
+const PadState PAD_LEFT         = {{1u << 5}};
+const PadState PAD_UP           = {{1u << 6}};
+const PadState PAD_DOWN         = {{1u << 7}};
+const PadState PAD_R            = {{1u << 8}};
+const PadState PAD_L            = {{1u << 9}};
+const PadState PAD_X            = {{1u << 10}};
+const PadState PAD_Y            = {{1u << 11}};
+const PadState PAD_CIRCLE_RIGHT = {{1u << 28}};
+const PadState PAD_CIRCLE_LEFT  = {{1u << 29}};
+const PadState PAD_CIRCLE_UP    = {{1u << 30}};
+const PadState PAD_CIRCLE_DOWN  = {{1u << 31}};
+
+// Methods for updating the HID module's state
+void PadButtonPress(PadState pad_state);
+void PadButtonRelease(PadState pad_state);
+void PadUpdateComplete();
+
+/**
+ * HID service interface.
+ */
 class Interface : public Service::Interface {
 public:
 
diff --git a/src/video_core/video_core.h b/src/video_core/video_core.h
index d227b6aa4..5e8129b5a 100644
--- a/src/video_core/video_core.h
+++ b/src/video_core/video_core.h
@@ -27,6 +27,7 @@ static const int kScreenBottomHeight    = 240;  ///< 3DS bottom screen height
 
 extern RendererBase*   g_renderer;              ///< Renderer plugin
 extern int             g_current_frame;         ///< Current frame
+extern EmuWindow*      g_emu_window;            ///< Emu window
 
 /// Start the video core
 void Start();