1 files changed, 152 insertions, 0 deletions
diff --git a/src/core/frontend/key_map.cpp b/src/core/frontend/key_map.cpp
new file mode 100644
index 000000000..15f0e079c
--- /dev/null
+++ b/src/core/frontend/key_map.cpp
@@ -0,0 +1,152 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <map>
+#include "core/frontend/emu_window.h"
+#include "core/frontend/key_map.h"
+
+namespace KeyMap {
+
+// 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::CirclePadUp,
+    IndirectTarget::CirclePadDown,
+    IndirectTarget::CirclePadLeft,
+    IndirectTarget::CirclePadRight,
+    IndirectTarget::CirclePadModifier,
+}};
+
+static std::map<HostDeviceKey, KeyTarget> key_map;
+static int next_device_id = 0;
+
+static bool circle_pad_up = false;
+static bool circle_pad_down = false;
+static bool circle_pad_left = false;
+static bool circle_pad_right = false;
+static bool circle_pad_modifier = false;
+
+static void UpdateCirclePad(EmuWindow& emu_window) {
+    constexpr float SQRT_HALF = 0.707106781f;
+    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;
+
+    float modifier = circle_pad_modifier ? Settings::values.pad_circle_modifier_scale : 1.0f;
+    emu_window.CirclePadUpdated(x * modifier * (y == 0 ? 1.0f : SQRT_HALF),
+                                y * modifier * (x == 0 ? 1.0f : SQRT_HALF));
+}
+
+int NewDeviceId() {
+    return next_device_id++;
+}
+
+void SetKeyMapping(HostDeviceKey key, KeyTarget target) {
+    key_map[key] = target;
+}
+
+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::CirclePadUp:
+            circle_pad_up = true;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CirclePadDown:
+            circle_pad_down = true;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CirclePadLeft:
+            circle_pad_left = true;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CirclePadRight:
+            circle_pad_right = true;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CirclePadModifier:
+            circle_pad_modifier = 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::CirclePadUp:
+            circle_pad_up = false;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CirclePadDown:
+            circle_pad_down = false;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CirclePadLeft:
+            circle_pad_left = false;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CirclePadRight:
+            circle_pad_right = false;
+            UpdateCirclePad(emu_window);
+            break;
+        case IndirectTarget::CirclePadModifier:
+            circle_pad_modifier = false;
+            UpdateCirclePad(emu_window);
+            break;
+        }
+    }
+}
+}