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  1. Qt
  2. QTBUG-139733

[Regression 6.8.3 -> 6.8.4] A transparent Window cannot be rendered properly if backend is OpenGL

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    • Windows
    • e413c726c (tqtc/lts-6.8)

      A minimal snippet:

      import QtQuick

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    color: "transparent"
    flags: Qt.FramelessWindowHint

    Text {
        anchors.centerIn: parent
        text: "Hello World!"
        font.pixelSize: 30
    }
}

      With 6.8.4, the default Direct3D result looks like:

      Transparent background with text visible. Perfect.

      With 6.8.4, the result of 

      QQuickView::setGraphicsApi(QSGRendererInterface::OpenGL);

      looks like:

      Well, you can't see anything. It is completely black.

      The problem does not happen back in 6.8.3. Both OpenGL and Direct3D render the window as expected.

        1. image-2025-09-03-12-07-20-719.png
          49 kB
          Luqiao Chen
        2. image-2025-09-03-12-08-23-982.png
          3 kB
          Luqiao Chen
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            owolff Oliver Wolff
            luqiaochen Luqiao Chen
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              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes