QWindow with Vulkan surface stalls during resize

[MnogoZnaet]

Pyqt6Ads

bandicam.2026-02-03.22-02-50-709.mp4

Default Pyqt6

bandicam.2026-02-03.22-15-03-324.mp4

Default pyqt has the same issue, but there are multiple tricks to make it work smoothly, for instance keep widget hot, by firing empty event next frame its created QTimer.singleShot(1, lambda: None), but with Pyqt6Ads it doesn't work. Also I tried many other workarounds, like add eventFilter on Ads resizing events, call repaint, update, processEvents. Added QPixmap of single pixel, none of this help

Vulkan surface code in pyqt is super simple, nothing fancy

class VulkanWindow(QWindow):
    def __init__(self):
        super().__init__()
        self.setFlags(Qt.WindowType.FramelessWindowHint)
        self.setSurfaceType(QSurface.SurfaceType.VulkanSurface)

class ViewportWidget(QWidget):
    def __init__(self):
        super().__init__()
        self._vulkan_window = VulkanWindow()
        self._container = QWidget.createWindowContainer(self._vulkan_window, self)
        self.viewport_hwnd = int(self._vulkan_window.winId())

then i pass hwnd to vulkan.

[githubuser0xFFFF]

Is this a Qt ADS issue. It looks more like a Qt issue. Hiw about disabling obaque resizing?

[MnogoZnaet]

Is this a Qt ADS issue. It looks more like a Qt issue. Hiw about disabling obaque resizing?

With default Qt it works fine, you can see that on second video

[githubuser0xFFFF]

Have you tried disabling opaque resizing?

[MnogoZnaet]

Have you tried disabling opaque resizing?

Unfortunatly that's not an option for game engines, resizing should be responsive and not deffered when resizing ends