intial work on creating a device interface

CMakeLists.txt

@@ -511,6 +511,8 @@ set(VIDEO_CORE src/video_core/amdgpu/liverpool.cpp
 
 set(INPUT src/input/controller.cpp
           src/input/controller.h
+          src/input/devices/devices.h
+          src/input/devices/sdl_keyboard.cpp
 )
 
 set(EMULATOR src/emulator.cpp

src/input/controller.cpp

@@ -10,6 +10,7 @@ namespace Input {
 GameController::GameController() {
     m_states_num = 0;
     m_last_state = State();
+    m_device = std::make_unique<SDLKeyboard>();
 }
 
 void GameController::ReadState(State* state, bool* isConnected, int* connectedCount) {

src/input/controller.h

@@ -5,6 +5,7 @@
 
 #include <mutex>
 #include "common/types.h"
+#include "devices/devices.h"
 
 namespace Input {
 
@@ -57,6 +58,7 @@ private:
     u32 m_first_state = 0;
     std::array<State, MAX_STATES> m_states;
     std::array<StateInternal, MAX_STATES> m_private;
+    std::unique_ptr<InputDevices> m_device;
 };
 
 } // namespace Input

src/input/devices/devices.h

@@ -0,0 +1,41 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <unordered_map>
+#include <common/types.h>
+
+namespace Input {
+
+struct InputMappings {
+    using Scancode = u32;
+    using Container = std::unordered_map<Scancode, u32>;
+
+    u32 getMapping(Scancode scancode) const {
+        auto it = container.find(scancode);
+        return it != container.end() ? it->second : -1;
+    }
+
+    void setMapping(Scancode scancode, u32 key) {
+        container[scancode] = key;
+    }
+
+private:
+    Container container;
+};
+
+class InputDevices {
+
+public:
+    virtual ~InputDevices() = default;
+    virtual InputMappings GetMappings() = 0;
+};
+
+class SDLKeyboard : public InputDevices {
+public:
+    virtual ~SDLKeyboard();
+    virtual InputMappings GetMappings() override;
+};
+
+} // namespace Input

src/input/devices/sdl_keyboard.cpp

@@ -0,0 +1,19 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <SDL3/SDL_keycode.h>
+#include "core/libraries/pad/pad.h"
+#include "devices.h"
+
+namespace Input {
+
+SDLKeyboard::~SDLKeyboard() {}
+
+InputMappings SDLKeyboard::GetMappings() {
+    using Libraries::Pad::OrbisPadButtonDataOffset;
+    InputMappings mappings;
+    mappings.setMapping(SDLK_UP, OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_UP);
+    // TODO the rest
+    return mappings;
+}
+} // namespace Input