separate EmuThread to its own file

src/frontend/qt_sdl/EmuThread.h

@@ -0,0 +1,134 @@
+/*
+    Copyright 2016-2023 melonDS team
+
+    This file is part of melonDS.
+
+    melonDS is free software: you can redistribute it and/or modify it under
+    the terms of the GNU General Public License as published by the Free
+    Software Foundation, either version 3 of the License, or (at your option)
+    any later version.
+
+    melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with melonDS. If not, see http://www.gnu.org/licenses/.
+*/
+
+#ifndef EMUTHREAD_H
+#define EMUTHREAD_H
+
+#include <QThread>
+#include <QMutex>
+
+#include <atomic>
+#include <variant>
+#include <optional>
+
+#include "NDSCart.h"
+#include "GBACart.h"
+
+using Keep = std::monostate;
+using UpdateConsoleNDSArgs = std::variant<Keep, std::unique_ptr<melonDS::NDSCart::CartCommon>>;
+using UpdateConsoleGBAArgs = std::variant<Keep, std::unique_ptr<melonDS::GBACart::CartCommon>>;
+namespace melonDS
+{
+class NDS;
+}
+
+class ScreenPanelGL;
+
+class EmuThread : public QThread
+{
+    Q_OBJECT
+    void run() override;
+
+public:
+    explicit EmuThread(QObject* parent = nullptr);
+
+    void changeWindowTitle(char* title);
+
+    // to be called from the UI thread
+    void emuRun();
+    void emuPause();
+    void emuUnpause();
+    void emuStop();
+    void emuFrameStep();
+
+    bool emuIsRunning();
+    bool emuIsActive();
+
+    void initContext();
+    void deinitContext();
+
+    int FrontBuffer = 0;
+    QMutex FrontBufferLock;
+
+    /// Applies the config in args.
+    /// Creates a new NDS console if needed,
+    /// modifies the existing one if possible.
+    /// @return \c true if the console was updated.
+    /// If this returns \c false, then the existing NDS console is not modified.
+    bool UpdateConsole(UpdateConsoleNDSArgs&& ndsargs, UpdateConsoleGBAArgs&& gbaargs) noexcept;
+    std::unique_ptr<melonDS::NDS> NDS; // TODO: Proper encapsulation and synchronization
+signals:
+    void windowUpdate();
+    void windowTitleChange(QString title);
+
+    void windowEmuStart();
+    void windowEmuStop();
+    void windowEmuPause();
+    void windowEmuReset();
+    void windowEmuFrameStep();
+
+    void windowLimitFPSChange();
+
+    void screenLayoutChange();
+
+    void windowFullscreenToggle();
+
+    void swapScreensToggle();
+    void screenEmphasisToggle();
+
+    void syncVolumeLevel();
+
+private:
+    std::unique_ptr<melonDS::NDS> CreateConsole(
+        std::unique_ptr<melonDS::NDSCart::CartCommon>&& ndscart,
+        std::unique_ptr<melonDS::GBACart::CartCommon>&& gbacart
+    ) noexcept;
+
+    enum EmuStatusKind
+    {
+        emuStatus_Exit,
+        emuStatus_Running,
+        emuStatus_Paused,
+        emuStatus_FrameStep,
+    };
+    std::atomic<EmuStatusKind> EmuStatus;
+
+    EmuStatusKind PrevEmuStatus;
+    EmuStatusKind EmuRunning;
+
+    constexpr static int EmuPauseStackRunning = 0;
+    constexpr static int EmuPauseStackPauseThreshold = 1;
+    int EmuPauseStack;
+
+    enum ContextRequestKind
+    {
+        contextRequest_None = 0,
+        contextRequest_InitGL,
+        contextRequest_DeInitGL
+    };
+    std::atomic<ContextRequestKind> ContextRequest = contextRequest_None;
+
+    ScreenPanelGL* screenGL;
+
+    int autoScreenSizing;
+
+    int videoRenderer;
+    bool videoSettingsDirty;
+};
+
+#endif // EMUTHREAD_H