8 files changed, 207 insertions, 23 deletions

diff --git a/src/core/hle/service/hid/hid.cpp b/src/core/hle/service/hid/hid.cpp
index b19e831fe..64d01cdd7 100644
--- a/src/core/hle/service/hid/hid.cpp
+++ b/src/core/hle/service/hid/hid.cpp
@@ -53,30 +53,29 @@ static std::array<std::unique_ptr<Input::ButtonDevice>, Settings::NativeButton::
     buttons;
 static std::unique_ptr<Input::AnalogDevice> circle_pad;
 
-static PadState GetCirclePadDirectionState(s16 circle_pad_x, s16 circle_pad_y) {
+DirectionState GetStickDirectionState(s16 circle_pad_x, s16 circle_pad_y) {
     // 30 degree and 60 degree are angular thresholds for directions
     constexpr float TAN30 = 0.577350269f;
     constexpr float TAN60 = 1 / TAN30;
     // a circle pad radius greater than 40 will trigger circle pad direction
     constexpr int CIRCLE_PAD_THRESHOLD_SQUARE = 40 * 40;
-    PadState state;
-    state.hex = 0;
+    DirectionState state{false, false, false, false};
 
     if (circle_pad_x * circle_pad_x + circle_pad_y * circle_pad_y > CIRCLE_PAD_THRESHOLD_SQUARE) {
         float t = std::abs(static_cast<float>(circle_pad_y) / circle_pad_x);
 
         if (circle_pad_x != 0 && t < TAN60) {
             if (circle_pad_x > 0)
-                state.circle_right.Assign(1);
+                state.right = true;
             else
-                state.circle_left.Assign(1);
+                state.left = true;
         }
 
         if (circle_pad_x == 0 || t > TAN30) {
             if (circle_pad_y > 0)
-                state.circle_up.Assign(1);
+                state.up = true;
             else
-                state.circle_down.Assign(1);
+                state.down = true;
         }
     }
 
@@ -125,7 +124,11 @@ static void UpdatePadCallback(u64 userdata, int cycles_late) {
     constexpr int MAX_CIRCLEPAD_POS = 0x9C; // Max value for a circle pad position
     s16 circle_pad_x = static_cast<s16>(circle_pad_x_f * MAX_CIRCLEPAD_POS);
     s16 circle_pad_y = static_cast<s16>(circle_pad_y_f * MAX_CIRCLEPAD_POS);
-    state.hex |= GetCirclePadDirectionState(circle_pad_x, circle_pad_y).hex;
+    const DirectionState direction = GetStickDirectionState(circle_pad_x, circle_pad_y);
+    state.circle_up.Assign(direction.up);
+    state.circle_down.Assign(direction.down);
+    state.circle_left.Assign(direction.left);
+    state.circle_right.Assign(direction.right);
 
     mem->pad.current_state.hex = state.hex;
     mem->pad.index = next_pad_index;
diff --git a/src/core/hle/service/hid/hid.h b/src/core/hle/service/hid/hid.h
index b505cdcd5..1ef972e70 100644
--- a/src/core/hle/service/hid/hid.h
+++ b/src/core/hle/service/hid/hid.h
@@ -176,6 +176,16 @@ ASSERT_REG_POSITION(touch.index_reset_ticks, 0x2A);
 #undef ASSERT_REG_POSITION
 #endif // !defined(_MSC_VER)
 
+struct DirectionState {
+    bool up;
+    bool down;
+    bool left;
+    bool right;
+};
+
+/// Translates analog stick axes to directions. This is exposed for ir_rst module to use.
+DirectionState GetStickDirectionState(s16 circle_pad_x, s16 circle_pad_y);
+
 /**
  * HID::GetIPCHandles service function
  *  Inputs:
diff --git a/src/core/hle/service/ir/ir.cpp b/src/core/hle/service/ir/ir.cpp
index 7ac34a990..f06dd552f 100644
--- a/src/core/hle/service/ir/ir.cpp
+++ b/src/core/hle/service/ir/ir.cpp
@@ -25,6 +25,11 @@ void Shutdown() {
     ShutdownRST();
 }
 
+void ReloadInputDevices() {
+    ReloadInputDevicesUser();
+    ReloadInputDevicesRST();
+}
+
 } // namespace IR
 
 } // namespace Service
diff --git a/src/core/hle/service/ir/ir.h b/src/core/hle/service/ir/ir.h
index c741498e2..6be3e950c 100644
--- a/src/core/hle/service/ir/ir.h
+++ b/src/core/hle/service/ir/ir.h
@@ -16,5 +16,8 @@ void Init();
 /// Shutdown IR service
 void Shutdown();
 
+/// Reload input devices. Used when input configuration changed
+void ReloadInputDevices();
+
 } // namespace IR
 } // namespace Service
diff --git a/src/core/hle/service/ir/ir_rst.cpp b/src/core/hle/service/ir/ir_rst.cpp
index 3f1275c53..53807cd91 100644
--- a/src/core/hle/service/ir/ir_rst.cpp
+++ b/src/core/hle/service/ir/ir_rst.cpp
@@ -2,16 +2,135 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <atomic>
+#include "common/bit_field.h"
+#include "core/core_timing.h"
+#include "core/frontend/input.h"
 #include "core/hle/kernel/event.h"
 #include "core/hle/kernel/shared_memory.h"
+#include "core/hle/service/hid/hid.h"
 #include "core/hle/service/ir/ir.h"
 #include "core/hle/service/ir/ir_rst.h"
+#include "core/settings.h"
 
 namespace Service {
 namespace IR {
 
-static Kernel::SharedPtr<Kernel::Event> handle_event;
+union PadState {
+    u32_le hex;
+
+    BitField<14, 1, u32_le> zl;
+    BitField<15, 1, u32_le> zr;
+
+    BitField<24, 1, u32_le> c_stick_right;
+    BitField<25, 1, u32_le> c_stick_left;
+    BitField<26, 1, u32_le> c_stick_up;
+    BitField<27, 1, u32_le> c_stick_down;
+};
+
+struct PadDataEntry {
+    PadState current_state;
+    PadState delta_additions;
+    PadState delta_removals;
+
+    s16_le c_stick_x;
+    s16_le c_stick_y;
+};
+
+struct SharedMem {
+    u64_le index_reset_ticks;          ///< CPU tick count for when HID module updated entry index 0
+    u64_le index_reset_ticks_previous; ///< Previous `index_reset_ticks`
+    u32_le index;
+    INSERT_PADDING_WORDS(1);
+    std::array<PadDataEntry, 8> entries; ///< Last 8 pad entries
+};
+
+static_assert(sizeof(SharedMem) == 0x98, "SharedMem has wrong size!");
+
+static Kernel::SharedPtr<Kernel::Event> update_event;
 static Kernel::SharedPtr<Kernel::SharedMemory> shared_memory;
+static u32 next_pad_index;
+static int update_callback_id;
+static std::unique_ptr<Input::ButtonDevice> zl_button;
+static std::unique_ptr<Input::ButtonDevice> zr_button;
+static std::unique_ptr<Input::AnalogDevice> c_stick;
+static std::atomic<bool> is_device_reload_pending;
+static bool raw_c_stick;
+static int update_period;
+
+static void LoadInputDevices() {
+    zl_button = Input::CreateDevice<Input::ButtonDevice>(
+        Settings::values.buttons[Settings::NativeButton::ZL]);
+    zr_button = Input::CreateDevice<Input::ButtonDevice>(
+        Settings::values.buttons[Settings::NativeButton::ZR]);
+    c_stick = Input::CreateDevice<Input::AnalogDevice>(
+        Settings::values.analogs[Settings::NativeAnalog::CStick]);
+}
+
+static void UnloadInputDevices() {
+    zl_button = nullptr;
+    zr_button = nullptr;
+    c_stick = nullptr;
+}
+
+static void UpdateCallback(u64 userdata, int cycles_late) {
+    SharedMem* mem = reinterpret_cast<SharedMem*>(shared_memory->GetPointer());
+
+    if (is_device_reload_pending.exchange(false))
+        LoadInputDevices();
+
+    PadState state;
+    state.zl.Assign(zl_button->GetStatus());
+    state.zr.Assign(zr_button->GetStatus());
+
+    // Get current c-stick position and update c-stick direction
+    float c_stick_x_f, c_stick_y_f;
+    std::tie(c_stick_x_f, c_stick_y_f) = c_stick->GetStatus();
+    constexpr int MAX_CSTICK_RADIUS = 0x9C; // Max value for a c-stick radius
+    const s16 c_stick_x = static_cast<s16>(c_stick_x_f * MAX_CSTICK_RADIUS);
+    const s16 c_stick_y = static_cast<s16>(c_stick_y_f * MAX_CSTICK_RADIUS);
+
+    if (!raw_c_stick) {
+        const HID::DirectionState direction = HID::GetStickDirectionState(c_stick_x, c_stick_y);
+        state.c_stick_up.Assign(direction.up);
+        state.c_stick_down.Assign(direction.down);
+        state.c_stick_left.Assign(direction.left);
+        state.c_stick_right.Assign(direction.right);
+    }
+
+    // TODO (wwylele): implement raw C-stick data for raw_c_stick = true
+
+    const u32 last_entry_index = mem->index;
+    mem->index = next_pad_index;
+    next_pad_index = (next_pad_index + 1) % mem->entries.size();
+
+    // Get the previous Pad state
+    PadState old_state{mem->entries[last_entry_index].current_state};
+
+    // Compute bitmask with 1s for bits different from the old state
+    PadState changed = {state.hex ^ old_state.hex};
+
+    // Get the current Pad entry
+    PadDataEntry& pad_entry = mem->entries[mem->index];
+
+    // Update entry properties
+    pad_entry.current_state.hex = state.hex;
+    pad_entry.delta_additions.hex = changed.hex & state.hex;
+    pad_entry.delta_removals.hex = changed.hex & old_state.hex;
+    pad_entry.c_stick_x = c_stick_x;
+    pad_entry.c_stick_y = c_stick_y;
+
+    // If we just updated index 0, provide a new timestamp
+    if (mem->index == 0) {
+        mem->index_reset_ticks_previous = mem->index_reset_ticks;
+        mem->index_reset_ticks = CoreTiming::GetTicks();
+    }
+
+    update_event->Signal();
+
+    // Reschedule recurrent event
+    CoreTiming::ScheduleEvent(msToCycles(update_period) - cycles_late, update_callback_id);
+}
 
 /**
  * IR::GetHandles service function
@@ -22,18 +141,52 @@ static Kernel::SharedPtr<Kernel::SharedMemory> shared_memory;
  *      4 : Event handle
  */
 static void GetHandles(Interface* self) {
-    u32* cmd_buff = Kernel::GetCommandBuffer();
+    IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x01, 0, 0);
+    IPC::RequestBuilder rb = rp.MakeBuilder(1, 3);
+    rb.Push(RESULT_SUCCESS);
+    rb.PushMoveHandles(Kernel::g_handle_table.Create(Service::IR::shared_memory).MoveFrom(),
+                       Kernel::g_handle_table.Create(Service::IR::update_event).MoveFrom());
+}
+
+/**
+ * IR::Initialize service function
+ *  Inputs:
+ *      1 : pad state update period in ms
+ *      2 : bool output raw c-stick data
+ */
+static void Initialize(Interface* self) {
+    IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x02, 2, 0);
+    update_period = static_cast<int>(rp.Pop<u32>());
+    raw_c_stick = rp.Pop<bool>();
 
-    cmd_buff[1] = RESULT_SUCCESS.raw;
-    cmd_buff[2] = 0x4000000;
-    cmd_buff[3] = Kernel::g_handle_table.Create(Service::IR::shared_memory).MoveFrom();
-    cmd_buff[4] = Kernel::g_handle_table.Create(Service::IR::handle_event).MoveFrom();
+    if (raw_c_stick)
+        LOG_ERROR(Service_IR, "raw C-stick data is not implemented!");
+
+    next_pad_index = 0;
+    is_device_reload_pending.store(true);
+    CoreTiming::ScheduleEvent(msToCycles(update_period), update_callback_id);
+
+    IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
+    rb.Push(RESULT_SUCCESS);
+
+    LOG_DEBUG(Service_IR, "called. update_period=%d, raw_c_stick=%d", update_period, raw_c_stick);
+}
+
+static void Shutdown(Interface* self) {
+    IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x03, 1, 0);
+
+    CoreTiming::UnscheduleEvent(update_callback_id, 0);
+    UnloadInputDevices();
+
+    IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
+    rb.Push(RESULT_SUCCESS);
+    LOG_DEBUG(Service_IR, "called");
 }
 
 const Interface::FunctionInfo FunctionTable[] = {
     {0x00010000, GetHandles, "GetHandles"},
-    {0x00020080, nullptr, "Initialize"},
-    {0x00030000, nullptr, "Shutdown"},
+    {0x00020080, Initialize, "Initialize"},
+    {0x00030000, Shutdown, "Shutdown"},
     {0x00090000, nullptr, "WriteToTwoFields"},
 };
 
@@ -43,17 +196,24 @@ IR_RST_Interface::IR_RST_Interface() {
 
 void InitRST() {
     using namespace Kernel;
-
+    // Note: these two kernel objects are even available before Initialize service function is
+    // called.
     shared_memory =
-        SharedMemory::Create(nullptr, 0x1000, MemoryPermission::ReadWrite,
-                             MemoryPermission::ReadWrite, 0, MemoryRegion::BASE, "IR:SharedMemory");
+        SharedMemory::Create(nullptr, 0x1000, MemoryPermission::ReadWrite, MemoryPermission::Read,
+                             0, MemoryRegion::BASE, "IRRST:SharedMemory");
+    update_event = Event::Create(ResetType::OneShot, "IRRST:UpdateEvent");
 
-    handle_event = Event::Create(ResetType::OneShot, "IR:HandleEvent");
+    update_callback_id = CoreTiming::RegisterEvent("IRRST:UpdateCallBack", UpdateCallback);
 }
 
 void ShutdownRST() {
     shared_memory = nullptr;
-    handle_event = nullptr;
+    update_event = nullptr;
+    UnloadInputDevices();
+}
+
+void ReloadInputDevicesRST() {
+    is_device_reload_pending.store(true);
 }
 
 } // namespace IR
diff --git a/src/core/hle/service/ir/ir_rst.h b/src/core/hle/service/ir/ir_rst.h
index 75b732627..d932bb7e5 100644
--- a/src/core/hle/service/ir/ir_rst.h
+++ b/src/core/hle/service/ir/ir_rst.h
@@ -21,5 +21,8 @@ public:
 void InitRST();
 void ShutdownRST();
 
+/// Reload input devices. Used when input configuration changed
+void ReloadInputDevicesRST();
+
 } // namespace IR
 } // namespace Service
diff --git a/src/core/hle/service/ir/ir_user.cpp b/src/core/hle/service/ir/ir_user.cpp
index bccf6bce7..226af0083 100644
--- a/src/core/hle/service/ir/ir_user.cpp
+++ b/src/core/hle/service/ir/ir_user.cpp
@@ -542,7 +542,7 @@ void ShutdownUser() {
     receive_event = nullptr;
 }
 
-void ReloadInputDevices() {
+void ReloadInputDevicesUser() {
     if (extra_hid)
         extra_hid->RequestInputDevicesReload();
 }
diff --git a/src/core/hle/service/ir/ir_user.h b/src/core/hle/service/ir/ir_user.h
index 2401346e8..930650406 100644
--- a/src/core/hle/service/ir/ir_user.h
+++ b/src/core/hle/service/ir/ir_user.h
@@ -52,7 +52,7 @@ void InitUser();
 void ShutdownUser();
 
 /// Reload input devices. Used when input configuration changed
-void ReloadInputDevices();
+void ReloadInputDevicesUser();
 
 } // namespace IR
 } // namespace Service