4 files changed, 210 insertions, 23 deletions

diff --git a/src/common/emu_window.cpp b/src/common/emu_window.cpp
index b2807354a..08270dd88 100644
--- a/src/common/emu_window.cpp
+++ b/src/common/emu_window.cpp
@@ -11,12 +11,28 @@
 #include "emu_window.h"
 #include "video_core/video_core.h"
 
-void EmuWindow::KeyPressed(KeyMap::HostDeviceKey key) {
-    pad_state.hex |= KeyMap::GetPadKey(key).hex;
+void EmuWindow::ButtonPressed(Service::HID::PadState pad) {
+    pad_state.hex |= pad.hex;
 }
 
-void EmuWindow::KeyReleased(KeyMap::HostDeviceKey key) {
-    pad_state.hex &= ~KeyMap::GetPadKey(key).hex;
+void EmuWindow::ButtonReleased(Service::HID::PadState pad) {
+    pad_state.hex &= ~pad.hex;
+}
+
+void EmuWindow::CirclePadUpdated(float x, float y) {
+    constexpr int MAX_CIRCLEPAD_POS = 0x9C; // Max value for a circle pad position
+
+    // Make sure the coordinates are in the unit circle,
+    // otherwise normalize it.
+    float r = x * x + y * y;
+    if (r > 1) {
+        r = std::sqrt(r);
+        x /= r;
+        y /= r;
+    }
+
+    circle_pad_x = static_cast<s16>(x * MAX_CIRCLEPAD_POS);
+    circle_pad_y = static_cast<s16>(y * MAX_CIRCLEPAD_POS);
 }
 
 /**
diff --git a/src/common/emu_window.h b/src/common/emu_window.h
index 7c3486dea..0ae3ea2af 100644
--- a/src/common/emu_window.h
+++ b/src/common/emu_window.h
@@ -12,10 +12,6 @@
 
 #include "core/hle/service/hid/hid.h"
 
-namespace KeyMap {
-struct HostDeviceKey;
-}
-
 /**
  * Abstraction class used to provide an interface between emulation code and the frontend
  * (e.g. SDL, QGLWidget, GLFW, etc...).
@@ -76,11 +72,27 @@ public:
 
     virtual void ReloadSetKeymaps() = 0;
 
-    /// Signals a key press action to the HID module
-    void KeyPressed(KeyMap::HostDeviceKey key);
+    /**
+     * Signals a button press action to the HID module.
+     * @param pad_state indicates which button to press
+     * @note only handle real buttons (A/B/X/Y/...), excluding analog input like 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 handle real buttons (A/B/X/Y/...), excluding analog input like circle pad.
+     */
+    void ButtonReleased(Service::HID::PadState pad_state);
 
-    /// Signals a key release action to the HID module
-    void KeyReleased(KeyMap::HostDeviceKey key);
+    /**
+     * 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)
@@ -100,8 +112,9 @@ public:
     void TouchMoved(unsigned framebuffer_x, unsigned framebuffer_y);
 
     /**
-     * Gets the current pad state (which buttons are pressed and the circle pad direction).
+     * 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
      */
@@ -110,6 +123,16 @@ public:
     }
 
     /**
+     * Gets the current cirle 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.
@@ -200,6 +223,8 @@ protected:
         pad_state.hex = 0;
         touch_x = 0;
         touch_y = 0;
+        circle_pad_x = 0;
+        circle_pad_y = 0;
         touch_pressed = false;
     }
     virtual ~EmuWindow() {}
@@ -260,6 +285,9 @@ private:
     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.
     */
diff --git a/src/common/key_map.cpp b/src/common/key_map.cpp
index 844d5df68..c8f168aa1 100644
--- a/src/common/key_map.cpp
+++ b/src/common/key_map.cpp
@@ -2,24 +2,124 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include "key_map.h"
 #include <map>
 
+#include "common/emu_window.h"
+#include "common/key_map.h"
+
 namespace KeyMap {
 
-static std::map<HostDeviceKey, Service::HID::PadState> key_map;
+// TODO (wwylele): currently we treat c-stick as four direction buttons
+//     and map it directly to EmuWindow::ButtonPressed.
+//     It should go the analog input way like circle pad does.
+const std::array<KeyTarget, Settings::NativeInput::NUM_INPUTS> mapping_targets = {{
+    Service::HID::PAD_A, Service::HID::PAD_B, Service::HID::PAD_X, Service::HID::PAD_Y,
+    Service::HID::PAD_L, Service::HID::PAD_R, Service::HID::PAD_ZL, Service::HID::PAD_ZR,
+    Service::HID::PAD_START, Service::HID::PAD_SELECT, Service::HID::PAD_NONE,
+    Service::HID::PAD_UP, Service::HID::PAD_DOWN, Service::HID::PAD_LEFT, Service::HID::PAD_RIGHT,
+    Service::HID::PAD_C_UP, Service::HID::PAD_C_DOWN, Service::HID::PAD_C_LEFT, Service::HID::PAD_C_RIGHT,
+
+    IndirectTarget::CIRCLE_PAD_UP,
+    IndirectTarget::CIRCLE_PAD_DOWN,
+    IndirectTarget::CIRCLE_PAD_LEFT,
+    IndirectTarget::CIRCLE_PAD_RIGHT,
+}};
+
+static std::map<HostDeviceKey, KeyTarget> key_map;
 static int next_device_id = 0;
 
+static bool circle_pad_up = false, circle_pad_down = false, circle_pad_left = false, circle_pad_right = false;
+
+static void UpdateCirclePad(EmuWindow& emu_window) {
+    constexpr float SQRT_HALF = 0.707106781;
+    int x = 0, y = 0;
+
+    if (circle_pad_right)
+        ++x;
+    if (circle_pad_left)
+        --x;
+    if (circle_pad_up)
+        ++y;
+    if (circle_pad_down)
+        --y;
+    // TODO: apply modifier here
+    emu_window.CirclePadUpdated(x * (y == 0 ? 1.0 : SQRT_HALF), y * (x == 0 ? 1.0 : SQRT_HALF));
+}
+
 int NewDeviceId() {
     return next_device_id++;
 }
 
-void SetKeyMapping(HostDeviceKey key, Service::HID::PadState padState) {
-    key_map[key].hex = padState.hex;
+void SetKeyMapping(HostDeviceKey key, KeyTarget target) {
+    key_map[key] = target;
 }
 
-Service::HID::PadState GetPadKey(HostDeviceKey key) {
-    return key_map[key];
+void ClearKeyMapping(int device_id) {
+    auto iter = key_map.begin();
+    while (iter != key_map.end()) {
+        if (iter->first.device_id == device_id)
+            key_map.erase(iter++);
+        else
+            ++iter;
+    }
+}
+
+void PressKey(EmuWindow& emu_window, HostDeviceKey key) {
+    auto target = key_map.find(key);
+    if (target == key_map.end())
+        return;
+
+    if (target->second.direct) {
+        emu_window.ButtonPressed({{target->second.target.direct_target_hex}});
+    } else {
+        switch (target->second.target.indirect_target) {
+        case IndirectTarget::CIRCLE_PAD_UP:
+            circle_pad_up = true;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CIRCLE_PAD_DOWN:
+            circle_pad_down = true;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CIRCLE_PAD_LEFT:
+            circle_pad_left = true;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CIRCLE_PAD_RIGHT:
+            circle_pad_right = true;
+            UpdateCirclePad(emu_window);
+            break;
+        }
+    }
+}
+
+void ReleaseKey(EmuWindow& emu_window,HostDeviceKey key) {
+    auto target = key_map.find(key);
+    if (target == key_map.end())
+        return;
+
+    if (target->second.direct) {
+        emu_window.ButtonReleased({{target->second.target.direct_target_hex}});
+    } else {
+        switch (target->second.target.indirect_target) {
+        case IndirectTarget::CIRCLE_PAD_UP:
+            circle_pad_up = false;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CIRCLE_PAD_DOWN:
+            circle_pad_down = false;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CIRCLE_PAD_LEFT:
+            circle_pad_left = false;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CIRCLE_PAD_RIGHT:
+            circle_pad_right = false;
+            UpdateCirclePad(emu_window);
+            break;
+        }
+    }
 }
 
 }
diff --git a/src/common/key_map.h b/src/common/key_map.h
index 68f7e2f99..0438a14e0 100644
--- a/src/common/key_map.h
+++ b/src/common/key_map.h
@@ -4,11 +4,42 @@
 
 #pragma once
 
+#include <array>
 #include <tuple>
 #include "core/hle/service/hid/hid.h"
 
+class EmuWindow;
+
 namespace KeyMap {
 
+enum class IndirectTarget {
+    CIRCLE_PAD_UP, CIRCLE_PAD_DOWN, CIRCLE_PAD_LEFT, CIRCLE_PAD_RIGHT,
+};
+
+/**
+ * Represents a key mapping target. It can be a PadState that represents 3DS real buttons,
+ * or an IndirectTarget.
+ */
+struct KeyTarget {
+    bool direct;
+    union {
+        u32 direct_target_hex;
+        IndirectTarget indirect_target;
+    } target;
+
+    KeyTarget() : direct(true) {
+        target.direct_target_hex = 0;
+    }
+
+    KeyTarget(Service::HID::PadState pad) : direct(true) {
+        target.direct_target_hex = pad.hex;
+    }
+
+    KeyTarget(IndirectTarget i) : direct(false) {
+        target.indirect_target = i;
+    }
+};
+
 /**
  * Represents a key for a specific host device.
  */
@@ -27,19 +58,31 @@ struct HostDeviceKey {
     }
 };
 
+extern const std::array<KeyTarget, Settings::NativeInput::NUM_INPUTS> mapping_targets;
+
 /**
  * Generates a new device id, which uniquely identifies a host device within KeyMap.
  */
 int NewDeviceId();
 
 /**
- * Maps a device-specific key to a PadState.
+ * Maps a device-specific key to a target (a PadState or an IndirectTarget).
+ */
+void SetKeyMapping(HostDeviceKey key, KeyTarget target);
+
+/**
+ * Clears all key mappings belonging to one device.
+ */
+void ClearKeyMapping(int device_id);
+
+/**
+ * Maps a key press actions and call the corresponding function in EmuWindow
  */
-void SetKeyMapping(HostDeviceKey key, Service::HID::PadState padState);
+void PressKey(EmuWindow& emu_window, HostDeviceKey key);
 
 /**
- * Gets the PadState that's mapped to the provided device-specific key.
+ * Maps a key release actions and call the corresponding function in EmuWindow
  */
-Service::HID::PadState GetPadKey(HostDeviceKey key);
+void ReleaseKey(EmuWindow& emu_window, HostDeviceKey key);
 
 }