Basic gamepad support through SDL (#407)

* Add basic gamepad support through SDL

* lightbar, vibration, code style changes

* okay fine

* one day clang format will finally pass

src/core/libraries/pad/pad.cpp

@@ -419,9 +419,15 @@ int PS4_SYSV_ABI scePadSetForceIntercepted() {
 }
 
 int PS4_SYSV_ABI scePadSetLightBar(s32 handle, const OrbisPadLightBarParam* pParam) {
-    LOG_ERROR(Lib_Pad, "(STUBBED) called");
+    if (pParam != nullptr) {
+        LOG_INFO(Lib_Pad, "scePadSetLightBar called handle = {} rgb = {} {} {}", handle, pParam->r,
+                 pParam->g, pParam->b);
+        auto* controller = Common::Singleton<Input::GameController>::Instance();
+        controller->SetLightBarRGB(pParam->r, pParam->g, pParam->b);
         return ORBIS_OK;
     }
+    return ORBIS_PAD_ERROR_INVALID_ARG;
+}
 
 int PS4_SYSV_ABI scePadSetLightBarBaseBrightness() {
     LOG_ERROR(Lib_Pad, "(STUBBED) called");
@@ -479,9 +485,15 @@ int PS4_SYSV_ABI scePadSetUserColor() {
 }
 
 int PS4_SYSV_ABI scePadSetVibration(s32 handle, const OrbisPadVibrationParam* pParam) {
-    LOG_DEBUG(Lib_Pad, "(STUBBED) called");
+    if (pParam != nullptr) {
+        LOG_INFO(Lib_Pad, "scePadSetVibration called handle = {} data = {} , {}", handle,
+                 pParam->smallMotor, pParam->largeMotor);
+        auto* controller = Common::Singleton<Input::GameController>::Instance();
+        controller->SetVibration(pParam->smallMotor, pParam->largeMotor);
         return ORBIS_OK;
     }
+    return ORBIS_PAD_ERROR_INVALID_ARG;
+}
 
 int PS4_SYSV_ABI scePadSetVibrationForce() {
     LOG_ERROR(Lib_Pad, "(STUBBED) called");

src/input/controller.cpp

@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <SDL3/SDL.h>
 #include "core/libraries/kernel/time_management.h"
 #include "core/libraries/pad/pad.h"
 #include "input/controller.h"
@@ -117,4 +118,29 @@ void GameController::Axis(int id, Input::Axis axis, int value) {
     AddState(state);
 }
 
+void GameController::SetLightBarRGB(u8 r, u8 g, u8 b) {
+    if (m_sdl_gamepad != nullptr) {
+        SDL_SetGamepadLED(m_sdl_gamepad, r, g, b);
+    }
+}
+
+bool GameController::SetVibration(u8 smallMotor, u8 largeMotor) {
+    if (m_sdl_gamepad != nullptr) {
+        return SDL_RumbleGamepad(m_sdl_gamepad, (smallMotor / 255.0f) * 0xFFFF,
+                                 (largeMotor / 255.0f) * 0xFFFF, -1) == 0;
+    }
+    return true;
+}
+
+void GameController::TryOpenSDLController() {
+    if (m_sdl_gamepad == nullptr || !SDL_GamepadConnected(m_sdl_gamepad)) {
+        int gamepad_count;
+        SDL_JoystickID* gamepads = SDL_GetGamepads(&gamepad_count);
+        m_sdl_gamepad = gamepad_count > 0 ? SDL_OpenGamepad(gamepads[0]) : nullptr;
+        SDL_free(gamepads);
+    }
+
+    SetLightBarRGB(0, 0, 255);
+}
+
 } // namespace Input

src/input/controller.h

@@ -6,6 +6,8 @@
 #include <mutex>
 #include "common/types.h"
 
+struct SDL_Gamepad;
+
 namespace Input {
 
 enum class Axis {
@@ -43,6 +45,9 @@ public:
     void CheckButton(int id, u32 button, bool isPressed);
     void AddState(const State& state);
     void Axis(int id, Input::Axis axis, int value);
+    void SetLightBarRGB(u8 r, u8 g, u8 b);
+    bool SetVibration(u8 smallMotor, u8 largeMotor);
+    void TryOpenSDLController();
 
 private:
     struct StateInternal {
@@ -57,6 +62,8 @@ private:
     u32 m_first_state = 0;
     std::array<State, MAX_STATES> m_states;
     std::array<StateInternal, MAX_STATES> m_private;
+
+    SDL_Gamepad* m_sdl_gamepad = nullptr;
 };
 
 } // namespace Input

src/sdl_window.cpp

@@ -43,6 +43,9 @@ WindowSDL::WindowSDL(s32 width_, s32 height_, Input::GameController* controller_
 
     SDL_SetWindowFullscreen(window, Config::isFullscreenMode());
 
+    SDL_InitSubSystem(SDL_INIT_GAMEPAD);
+    controller->TryOpenSDLController();
+
 #if defined(SDL_PLATFORM_WIN32)
     window_info.type = WindowSystemType::Windows;
     window_info.render_surface = SDL_GetPointerProperty(SDL_GetWindowProperties(window),
@@ -92,6 +95,11 @@ void WindowSDL::waitEvent() {
     case SDL_EVENT_KEY_UP:
         onKeyPress(&event);
         break;
+    case SDL_EVENT_GAMEPAD_BUTTON_DOWN:
+    case SDL_EVENT_GAMEPAD_BUTTON_UP:
+    case SDL_EVENT_GAMEPAD_AXIS_MOTION:
+        onGamepadEvent(&event);
+        break;
     case SDL_EVENT_QUIT:
         is_open = false;
         break;
@@ -276,4 +284,71 @@ void WindowSDL::onKeyPress(const SDL_Event* event) {
     }
 }
 
+void WindowSDL::onGamepadEvent(const SDL_Event* event) {
+    using Libraries::Pad::OrbisPadButtonDataOffset;
+
+    u32 button = 0;
+    Input::Axis axis = Input::Axis::AxisMax;
+    switch (event->type) {
+    case SDL_EVENT_GAMEPAD_BUTTON_DOWN:
+    case SDL_EVENT_GAMEPAD_BUTTON_UP:
+        button = sdlGamepadToOrbisButton(event->gbutton.button);
+        if (button != 0) {
+            controller->CheckButton(0, button, event->type == SDL_EVENT_GAMEPAD_BUTTON_DOWN);
+        }
+        break;
+    case SDL_EVENT_GAMEPAD_AXIS_MOTION:
+        axis = event->gaxis.axis == SDL_GAMEPAD_AXIS_LEFTX           ? Input::Axis::LeftX
+               : event->gaxis.axis == SDL_GAMEPAD_AXIS_LEFTY         ? Input::Axis::LeftY
+               : event->gaxis.axis == SDL_GAMEPAD_AXIS_RIGHTX        ? Input::Axis::RightX
+               : event->gaxis.axis == SDL_GAMEPAD_AXIS_RIGHTY        ? Input::Axis::RightY
+               : event->gaxis.axis == SDL_GAMEPAD_AXIS_LEFT_TRIGGER  ? Input::Axis::TriggerLeft
+               : event->gaxis.axis == SDL_GAMEPAD_AXIS_RIGHT_TRIGGER ? Input::Axis::TriggerRight
+                                                                     : Input::Axis::AxisMax;
+        if (axis != Input::Axis::AxisMax) {
+            controller->Axis(0, axis, Input::GetAxis(-0x8000, 0x8000, event->gaxis.value));
+        }
+        break;
+    }
+}
+
+int WindowSDL::sdlGamepadToOrbisButton(u8 button) {
+    using Libraries::Pad::OrbisPadButtonDataOffset;
+
+    switch (button) {
+    case SDL_GAMEPAD_BUTTON_DPAD_DOWN:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_DOWN;
+    case SDL_GAMEPAD_BUTTON_DPAD_UP:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_UP;
+    case SDL_GAMEPAD_BUTTON_DPAD_LEFT:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_LEFT;
+    case SDL_GAMEPAD_BUTTON_DPAD_RIGHT:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_RIGHT;
+    case SDL_GAMEPAD_BUTTON_SOUTH:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_CROSS;
+    case SDL_GAMEPAD_BUTTON_NORTH:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_TRIANGLE;
+    case SDL_GAMEPAD_BUTTON_WEST:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_SQUARE;
+    case SDL_GAMEPAD_BUTTON_EAST:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_CIRCLE;
+    case SDL_GAMEPAD_BUTTON_START:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_OPTIONS;
+    case SDL_GAMEPAD_BUTTON_TOUCHPAD:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_TOUCH_PAD;
+    case SDL_GAMEPAD_BUTTON_BACK:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_TOUCH_PAD;
+    case SDL_GAMEPAD_BUTTON_LEFT_SHOULDER:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_L1;
+    case SDL_GAMEPAD_BUTTON_RIGHT_SHOULDER:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_R1;
+    case SDL_GAMEPAD_BUTTON_LEFT_STICK:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_L3;
+    case SDL_GAMEPAD_BUTTON_RIGHT_STICK:
+        return OrbisPadButtonDataOffset::ORBIS_PAD_BUTTON_R3;
+    default:
+        return 0;
+    }
+}
+
 } // namespace Frontend

src/sdl_window.h

@@ -7,6 +7,7 @@
 #include "common/types.h"
 
 struct SDL_Window;
+struct SDL_Gamepad;
 union SDL_Event;
 
 namespace Input {
@@ -66,6 +67,9 @@ public:
 private:
     void onResize();
     void onKeyPress(const SDL_Event* event);
+    void onGamepadEvent(const SDL_Event* event);
+
+    int sdlGamepadToOrbisButton(u8 button);
 
 private:
     s32 width;