1 files changed, 269 insertions, 0 deletions
diff --git a/src/yuzu_cmd/emu_window/emu_window_sdl3.cpp b/src/yuzu_cmd/emu_window/emu_window_sdl3.cpp
new file mode 100644
index 0000000000..cd390d29f9
--- /dev/null
+++ b/src/yuzu_cmd/emu_window/emu_window_sdl3.cpp
@@ -0,0 +1,269 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// SPDX-FileCopyrightText: 2016 Citra Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <SDL3/SDL.h>
+
+#include "common/logging.h"
+#include "common/scm_rev.h"
+#include "common/settings.h"
+#include "core/core.h"
+#include "core/perf_stats.h"
+#include "hid_core/hid_core.h"
+#include "input_common/drivers/keyboard.h"
+#include "input_common/drivers/mouse.h"
+#include "input_common/drivers/touch_screen.h"
+#include "input_common/main.h"
+#include "yuzu_cmd/emu_window/emu_window_sdl3.h"
+#include "yuzu_cmd/yuzu_icon.h"
+
+EmuWindow_SDL3::EmuWindow_SDL3(InputCommon::InputSubsystem* input_subsystem_, Core::System& system_)
+    : input_subsystem{input_subsystem_}, system{system_} {
+    input_subsystem->Initialize();
+    if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK | SDL_INIT_GAMEPAD)) {
+        LOG_CRITICAL(Frontend, "Failed to initialize SDL3: {}, Exiting...", SDL_GetError());
+        exit(1);
+    }
+}
+
+EmuWindow_SDL3::~EmuWindow_SDL3() {
+    system.HIDCore().UnloadInputDevices();
+    input_subsystem->Shutdown();
+    SDL_Quit();
+}
+
+InputCommon::MouseButton EmuWindow_SDL3::SDLButtonToMouseButton(u32 button) const {
+    switch (button) {
+    case SDL_BUTTON_LEFT:
+        return InputCommon::MouseButton::Left;
+    case SDL_BUTTON_RIGHT:
+        return InputCommon::MouseButton::Right;
+    case SDL_BUTTON_MIDDLE:
+        return InputCommon::MouseButton::Wheel;
+    case SDL_BUTTON_X1:
+        return InputCommon::MouseButton::Backward;
+    case SDL_BUTTON_X2:
+        return InputCommon::MouseButton::Forward;
+    default:
+        return InputCommon::MouseButton::Undefined;
+    }
+}
+
+/// @brief Translates pixel position to float position
+EmuWindow_SDL3::FloatPairNonHFA EmuWindow_SDL3::MouseToTouchPos(s32 touch_x, s32 touch_y) const {
+    int w = 0, h = 0;
+    SDL_GetWindowSize(render_window, &w, &h);
+    const float fx = float(touch_x) / w;
+    const float fy = float(touch_y) / h;
+    return {
+        std::clamp<float>(fx, 0.0f, 1.0f),
+        std::clamp<float>(fy, 0.0f, 1.0f),
+        0
+    };
+}
+
+void EmuWindow_SDL3::OnMouseButton(u32 button, u8 state, s32 x, s32 y) {
+    const auto mouse_button = SDLButtonToMouseButton(button);
+    if (state != 0) {
+        auto const [touch_x, touch_y, _] = MouseToTouchPos(x, y);
+        input_subsystem->GetMouse()->PressButton(x, y, mouse_button);
+        input_subsystem->GetMouse()->PressMouseButton(mouse_button);
+        input_subsystem->GetMouse()->PressTouchButton(touch_x, touch_y, mouse_button);
+    } else {
+        input_subsystem->GetMouse()->ReleaseButton(mouse_button);
+    }
+}
+
+void EmuWindow_SDL3::OnMouseMotion(s32 x, s32 y) {
+    auto const [touch_x, touch_y, _] = MouseToTouchPos(x, y);
+    input_subsystem->GetMouse()->Move(x, y, 0, 0);
+    input_subsystem->GetMouse()->MouseMove(touch_x, touch_y);
+    input_subsystem->GetMouse()->TouchMove(touch_x, touch_y);
+}
+
+void EmuWindow_SDL3::OnFingerDown(float x, float y, std::size_t id) {
+    input_subsystem->GetTouchScreen()->TouchPressed(x, y, id);
+}
+
+void EmuWindow_SDL3::OnFingerMotion(float x, float y, std::size_t id) {
+    input_subsystem->GetTouchScreen()->TouchMoved(x, y, id);
+}
+
+void EmuWindow_SDL3::OnFingerUp() {
+    input_subsystem->GetTouchScreen()->ReleaseAllTouch();
+}
+
+void EmuWindow_SDL3::OnKeyEvent(int key, u8 state) {
+    if (state != 0) {
+        input_subsystem->GetKeyboard()->PressKey(static_cast<std::size_t>(key));
+    } else {
+        input_subsystem->GetKeyboard()->ReleaseKey(static_cast<std::size_t>(key));
+    }
+}
+
+bool EmuWindow_SDL3::IsOpen() const {
+    return is_open;
+}
+
+bool EmuWindow_SDL3::IsShown() const {
+    return is_shown;
+}
+
+void EmuWindow_SDL3::OnResize() {
+    int width, height;
+    SDL_GetWindowSizeInPixels(render_window, &width, &height);
+    UpdateCurrentFramebufferLayout(width, height);
+}
+
+void EmuWindow_SDL3::ShowCursor(bool show_cursor) {
+    if (show_cursor) {
+        SDL_ShowCursor();
+    } else {
+        SDL_HideCursor();
+    }
+}
+
+void EmuWindow_SDL3::Fullscreen() {
+    SDL_DisplayMode display_mode;
+    switch (Settings::values.fullscreen_mode.GetValue()) {
+    case Settings::FullscreenMode::Exclusive:
+        // Set window size to render size before entering fullscreen in exclusive mode.
+        if (const SDL_DisplayMode* display_mode_ptr =
+                SDL_GetDesktopDisplayMode(SDL_GetDisplayForWindow(render_window))) {
+            display_mode = *display_mode_ptr;
+            SDL_SetWindowSize(render_window, display_mode.w, display_mode.h);
+            SDL_SetWindowFullscreenMode(render_window, &display_mode);
+        } else {
+            LOG_ERROR(Frontend, "SDL_GetDesktopDisplayMode failed: {}", SDL_GetError());
+        }
+
+        if (SDL_SetWindowFullscreen(render_window, true)) {
+            return;
+        }
+
+        LOG_ERROR(Frontend, "Fullscreening failed: {}", SDL_GetError());
+        LOG_INFO(Frontend, "Attempting to use borderless fullscreen...");
+        [[fallthrough]];
+    case Settings::FullscreenMode::Borderless:
+        SDL_SetWindowFullscreenMode(render_window, nullptr);
+        if (SDL_SetWindowFullscreen(render_window, true)) {
+            return;
+        }
+
+        LOG_ERROR(Frontend, "Borderless fullscreening failed: {}", SDL_GetError());
+        [[fallthrough]];
+    default:
+        // Fallback algorithm: Maximise window.
+        // Works on all systems (unless something is seriously wrong), so no fallback for this one.
+        LOG_INFO(Frontend, "Falling back on a maximised window...");
+        SDL_MaximizeWindow(render_window);
+        break;
+    }
+}
+
+void EmuWindow_SDL3::WaitEvent() {
+    // Called on main thread
+    SDL_Event event;
+
+    if (!SDL_WaitEvent(&event)) {
+        const char* error = SDL_GetError();
+        if (!error || strcmp(error, "") == 0) {
+            // https://github.com/libsdl-org/SDL/issues/5780
+            // Sometimes SDL will return without actually having hit an error condition;
+            // just ignore it in this case.
+            return;
+        }
+
+        LOG_CRITICAL(Frontend, "SDL_WaitEvent failed: {}", error);
+        exit(1);
+    }
+
+    switch (event.type) {
+    case SDL_EVENT_WINDOW_RESIZED:
+    case SDL_EVENT_WINDOW_PIXEL_SIZE_CHANGED:
+    case SDL_EVENT_WINDOW_MAXIMIZED:
+    case SDL_EVENT_WINDOW_RESTORED:
+        OnResize();
+        break;
+    case SDL_EVENT_WINDOW_MINIMIZED:
+        is_shown = false;
+        OnResize();
+        break;
+    case SDL_EVENT_WINDOW_EXPOSED:
+        is_shown = true;
+        OnResize();
+        break;
+    case SDL_EVENT_WINDOW_CLOSE_REQUESTED:
+        is_open = false;
+        break;
+    case SDL_EVENT_KEY_DOWN:
+    case SDL_EVENT_KEY_UP:
+        OnKeyEvent(static_cast<int>(event.key.scancode), event.key.down ? 1 : 0);
+        break;
+    case SDL_EVENT_MOUSE_MOTION:
+        // ignore if it came from touch
+        if (event.button.which != SDL_TOUCH_MOUSEID)
+            OnMouseMotion(event.motion.x, event.motion.y);
+        break;
+    case SDL_EVENT_MOUSE_BUTTON_DOWN:
+    case SDL_EVENT_MOUSE_BUTTON_UP:
+        // ignore if it came from touch
+        if (event.button.which != SDL_TOUCH_MOUSEID) {
+            OnMouseButton(event.button.button, event.button.down ? 1 : 0,
+                          static_cast<s32>(event.button.x), static_cast<s32>(event.button.y));
+        }
+        break;
+    case SDL_EVENT_FINGER_DOWN:
+        OnFingerDown(event.tfinger.x, event.tfinger.y,
+                     static_cast<std::size_t>(event.tfinger.touchID));
+        break;
+    case SDL_EVENT_FINGER_MOTION:
+        OnFingerMotion(event.tfinger.x, event.tfinger.y,
+                       static_cast<std::size_t>(event.tfinger.touchID));
+        break;
+    case SDL_EVENT_FINGER_UP:
+        OnFingerUp();
+        break;
+    case SDL_EVENT_QUIT:
+        is_open = false;
+        break;
+    default:
+        break;
+    }
+
+    const u32 current_time = SDL_GetTicks();
+    if (current_time > last_time + 2000) {
+        const auto results = system.GetAndResetPerfStats();
+        const auto title = fmt::format("{} | {}-{} | FPS: {:.0f} ({:.0f}%)",
+                                       Common::g_build_fullname,
+                                       Common::g_scm_branch,
+                                       Common::g_scm_desc,
+                                       results.average_game_fps,
+                                       results.emulation_speed * 100.0);
+        SDL_SetWindowTitle(render_window, title.c_str());
+        last_time = current_time;
+    }
+}
+
+// Credits to Samantas5855 and others for this function.
+void EmuWindow_SDL3::SetWindowIcon() {
+    SDL_IOStream* const yuzu_icon_stream = SDL_IOFromConstMem((void*)yuzu_icon, yuzu_icon_size);
+    if (yuzu_icon_stream == nullptr) {
+        LOG_WARNING(Frontend, "Failed to create Eden icon stream.");
+        return;
+    }
+    SDL_Surface* const window_icon = SDL_LoadBMP_IO(yuzu_icon_stream, true);
+    if (window_icon == nullptr) {
+        LOG_WARNING(Frontend, "Failed to read BMP from stream.");
+        return;
+    }
+    // The icon is attached to the window pointer
+    SDL_SetWindowIcon(render_window, window_icon);
+    SDL_DestroySurface(window_icon);
+}
+
+void EmuWindow_SDL3::OnMinimalClientAreaChangeRequest(std::pair<u32, u32> minimal_size) {
+    SDL_SetWindowMinimumSize(render_window, minimal_size.first, minimal_size.second);
+}