* use GL shim window instead of offscreen surface

* disable vsync by default (we'll take care of it later)

src/frontend/qt_sdl/main.cpp

@@ -268,7 +268,7 @@ void EmuThread::initOpenGL()
     QOpenGLContext* windowctx = mainWindow->getOGLContext();
     QSurfaceFormat format = windowctx->format();
 
-    oglSurface = new QOffscreenSurface();
+    /*oglSurface = new QOffscreenSurface();
     oglSurface->setFormat(format);
     oglSurface->create();
     if (!oglSurface->isValid())
@@ -277,7 +277,8 @@ void EmuThread::initOpenGL()
         printf("oglSurface shat itself :(\n");
         delete oglSurface;
         return;
-    }
+    }*/
+    oglSurface = new GLShim(format);
 
     oglContext = new QOpenGLContext();//oglSurface);
     oglContext->setFormat(oglSurface->format());
@@ -957,6 +958,19 @@ void ScreenPanelGL::onScreenLayoutChanged()
 }
 
 
+GLShim::GLShim(QSurfaceFormat& format) : QWindow()
+{
+    setSurfaceType(QSurface::OpenGLSurface);
+    setFormat(format);
+    create();
+    hide();
+}
+
+GLShim::~GLShim()
+{
+}
+
+
 MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent)
 {
     setWindowTitle("melonDS " MELONDS_VERSION);
@@ -1835,6 +1849,7 @@ int main(int argc, char** argv)
     format.setStencilBufferSize(8);
     format.setVersion(3, 2);
     format.setProfile(QSurfaceFormat::CoreProfile);
+    format.setSwapInterval(0);
     QSurfaceFormat::setDefaultFormat(format);
 
     audioSync = SDL_CreateCond();

src/frontend/qt_sdl/main.h

@@ -21,6 +21,7 @@
 
 #include <QThread>
 #include <QWidget>
+#include <QWindow>
 #include <QMainWindow>
 #include <QImage>
 #include <QActionGroup>
@@ -74,7 +75,7 @@ private:
     int PrevEmuStatus;
     int EmuRunning;
 
-    QOffscreenSurface* oglSurface;
+    QSurface* oglSurface;
     QOpenGLContext* oglContext;
 };
 
@@ -162,6 +163,16 @@ private:
 };
 
 
+class GLShim : public QWindow
+{
+    Q_OBJECT
+
+public:
+    explicit GLShim(QSurfaceFormat& format);
+    ~GLShim();
+};
+
+
 class MainWindow : public QMainWindow
 {
     Q_OBJECT