1 files changed, 62 insertions, 0 deletions

diff --git a/src/core/hid/input_interpreter.cpp b/src/core/hid/input_interpreter.cpp
new file mode 100644
index 000000000..c33d8a11a
--- /dev/null
+++ b/src/core/hid/input_interpreter.cpp
@@ -0,0 +1,62 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/core.h"
+#include "core/hid/input_interpreter.h"
+#include "core/hle/service/hid/controllers/npad.h"
+#include "core/hle/service/hid/hid.h"
+#include "core/hle/service/sm/sm.h"
+
+InputInterpreter::InputInterpreter(Core::System& system)
+    : npad{system.ServiceManager()
+               .GetService<Service::HID::Hid>("hid")
+               ->GetAppletResource()
+               ->GetController<Service::HID::Controller_NPad>(Service::HID::HidController::NPad)} {
+    ResetButtonStates();
+}
+
+InputInterpreter::~InputInterpreter() = default;
+
+void InputInterpreter::PollInput() {
+    const u32 button_state = npad.GetAndResetPressState();
+
+    previous_index = current_index;
+    current_index = (current_index + 1) % button_states.size();
+
+    button_states[current_index] = button_state;
+}
+
+void InputInterpreter::ResetButtonStates() {
+    previous_index = 0;
+    current_index = 0;
+
+    button_states[0] = 0xFFFFFFFF;
+
+    for (std::size_t i = 1; i < button_states.size(); ++i) {
+        button_states[i] = 0;
+    }
+}
+
+bool InputInterpreter::IsButtonPressed(HIDButton button) const {
+    return (button_states[current_index] & (1U << static_cast<u8>(button))) != 0;
+}
+
+bool InputInterpreter::IsButtonPressedOnce(HIDButton button) const {
+    const bool current_press =
+        (button_states[current_index] & (1U << static_cast<u8>(button))) != 0;
+    const bool previous_press =
+        (button_states[previous_index] & (1U << static_cast<u8>(button))) != 0;
+
+    return current_press && !previous_press;
+}
+
+bool InputInterpreter::IsButtonHeld(HIDButton button) const {
+    u32 held_buttons{button_states[0]};
+
+    for (std::size_t i = 1; i < button_states.size(); ++i) {
+        held_buttons &= button_states[i];
+    }
+
+    return (held_buttons & (1U << static_cast<u8>(button))) != 0;
+}