don't segfault on closing

src/frontend/qt_sdl/main.cpp

@@ -464,15 +464,12 @@ void EmuThread::run()
     videoSettings.GL_ScaleFactor = Config::GL_ScaleFactor;
     videoSettings.GL_BetterPolygons = Config::GL_BetterPolygons;
 
-    bool hasOGL = mainWindow->hasOGL;
+    if (mainWindow->hasOGL)
-#ifdef OGLRENDERER_ENABLED
-    if (hasOGL)
     {
         initOpenGL();
         videoRenderer = Config::_3DRenderer;
     }
     else
-#endif
     {
         videoRenderer = 0;
     }
@@ -547,32 +544,26 @@ void EmuThread::run()
             // update render settings if needed
             if (videoSettingsDirty)
             {
-                if (hasOGL != mainWindow->hasOGL)
+                if (oglContext)
                 {
-                    hasOGL = mainWindow->hasOGL;
+                    oglContext->SetSwapInterval(Config::ScreenVSync ? Config::ScreenVSyncInterval : 0);
+                    videoRenderer = Config::_3DRenderer;
+                }
 #ifdef OGLRENDERER_ENABLED
-                    if (hasOGL)
-                        videoRenderer = Config::_3DRenderer;
-                    else
-#endif
-                        videoRenderer = 0;
-                }
                 else
+#endif
                 {
-                    videoRenderer = hasOGL ? Config::_3DRenderer : 0;
+                    videoRenderer = 0;
                 }                
 
+                videoRenderer = oglContext ? Config::_3DRenderer : 0;
+
                 videoSettingsDirty = false;
 
                 videoSettings.Soft_Threaded = Config::Threaded3D != 0;
                 videoSettings.GL_ScaleFactor = Config::GL_ScaleFactor;
                 videoSettings.GL_BetterPolygons = Config::GL_BetterPolygons;
 
-                if (hasOGL)
-                {
-                    oglContext->SetSwapInterval(Config::ScreenVSync ? Config::ScreenVSyncInterval : 0);
-                }
-
                 GPU::SetRenderSettings(videoRenderer, videoSettings);
             }
 
@@ -629,7 +620,7 @@ void EmuThread::run()
             if (ROMManager::GBASave)
                 ROMManager::GBASave->CheckFlush();
 
-            if (!hasOGL)
+            if (!oglContext)
             {
                 FrontBufferLock.lock();
                 FrontBuffer = GPU::FrontBuffer;
@@ -752,7 +743,7 @@ void EmuThread::run()
     NDS::DeInit();
     //Platform::LAN_DeInit();
 
-    if (hasOGL)
+    if (oglContext)
         deinitOpenGL();
 }
 
@@ -1831,6 +1822,15 @@ MainWindow::~MainWindow()
 {
 }
 
+void MainWindow::closeEvent(QCloseEvent* event)
+{
+    printf("close event\n");
+    emuThread->emuPause();
+    emuThread->deinitContext();
+
+    QMainWindow::closeEvent(event);
+}
+
 void MainWindow::createScreenPanel()
 {
     hasOGL = (Config::ScreenUseGL != 0) || (Config::_3DRenderer != 0);

src/frontend/qt_sdl/main.h

@@ -31,6 +31,7 @@
 #include <QTimer>
 #include <QMutex>
 #include <QScreen>
+#include <QCloseEvent>
 
 #include <atomic>
 
@@ -325,6 +326,8 @@ private slots:
     void onFullscreenToggled();
 
 private:
+    void closeEvent(QCloseEvent* event);
+
     QStringList currentROM;
     QStringList currentGBAROM;
     QList<QString> recentFileList;