Finish Linux x86_64 build

src/lucina3ds/emu_window/emu_window_sdl2_gl.h

@@ -0,0 +1,39 @@
+// Copyright 2023 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "lucina3ds/emu_window/emu_window_sdl2.h"
+
+struct SDL_Window;
+
+namespace Core {
+class System;
+}
+
+class EmuWindow_SDL2_GL : public EmuWindow_SDL2 {
+public:
+    explicit EmuWindow_SDL2_GL(Core::System& system_, bool fullscreen, bool is_secondary);
+    ~EmuWindow_SDL2_GL();
+
+    void Present() override;
+    std::unique_ptr<GraphicsContext> CreateSharedContext() const override;
+    void MakeCurrent() override;
+    void DoneCurrent() override;
+    void SaveContext() override;
+    void RestoreContext() override;
+
+private:
+    using SDL_GLContext = void*;
+
+    /// The OpenGL context associated with the window
+    SDL_GLContext window_context;
+
+    /// Used by SaveContext and RestoreContext
+    SDL_GLContext last_saved_context;
+
+    /// The OpenGL context associated with the core
+    std::unique_ptr<Frontend::GraphicsContext> core_context;
+};