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  1. Qt
  2. QTBUG-80508

QSGGuiThreadRenderLoop uses single context for all windows

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    • 331e2effa7 (qt/qtdeclarative/dev)

    Description

      QSGGuiThreadRenderLoop::renderWindow uses a single shared QOpenGLContext for all windows, that is set up on first creation with:

              gl->setFormat(window->requestedFormat());
        gl->setScreen(window->screen());

      This is a problem is subsequent windows are rendered where the screen or surface format doesn't match. For example if the first window doesn't have an alpha, while the second window does, the GL context (on macOS e.g.) is setup without an NSOpenGLPFAAlphaSize, resulting in the second window not being transparent but instead black.

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          Bug - A problem which impairs or prevents the functions of the product. QTBUG-106707 WebAssembly: Can't use multiple canvases/screens for multiple QQuickViews

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          resulted from

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-75101 When a window is has a transparent background then it will not be rendered correctly and will be rendered black instead

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          For Gerrit Dashboard: QTBUG-80508
          # Subject Branch Project Status CR V
          434340,7 Make basic render loop use a dedicated QRhi per window dev qt/qtdeclarative Status: MERGED +2 0

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              lagocs Laszlo Agocs
              vestbo Tor Arne Vestbø
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                Resolved:

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