recreate mailbox to use a queue instead

src/citra_qt/bootmanager.cpp

@@ -260,9 +260,14 @@ void GRenderWindow::InitRenderTarget() {
     // TODO: One of these flags might be interesting: WA_OpaquePaintEvent, WA_NoBackground,
     // WA_DontShowOnScreen, WA_DeleteOnClose
     core_context = CreateSharedContext();
+    resize(Core::kScreenTopWidth, Core::kScreenTopHeight + Core::kScreenBottomHeight);
     BackupGeometry();
 }
 
+void GRenderWindow::initializeGL() {
+    context()->format().setSwapInterval(1);
+}
+
 void GRenderWindow::CaptureScreenshot(u32 res_scale, const QString& screenshot_path) {
     if (res_scale == 0)
         res_scale = VideoCore::GetResolutionScaleFactor();
@@ -294,7 +299,7 @@ void GRenderWindow::OnEmulationStopping() {
 }
 
 void GRenderWindow::paintGL() {
-    VideoCore::g_renderer->Present();
+    VideoCore::g_renderer->TryPresent(100);
     update();
 }
 

src/citra_qt/bootmanager.h

@@ -130,6 +130,7 @@ public:
     void PollEvents() override;
     std::unique_ptr<Frontend::GraphicsContext> CreateSharedContext() const override;
 
+    void initializeGL() override;
     void paintGL() override;
 
     void BackupGeometry();