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  1. Qt
  2. QTBUG-33919

Windows/Desktop OpenGL: QGLWidget has transparent background instead of a full opaque one as in 5.1.1 if configured with QGL::AlphaChannel

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Details

    • Bug
    • Resolution: Out of scope
    • Not Evaluated
    • None
    • 5.2.0 Alpha
    • GUI: OpenGL
    • None
    • Windows 7 Ultimate 64Bit
      Intel Core i7-2720QM with NVidia Quadro 3000M
      Qt 5.2 Alpha built with VS2012 Express in 64Bit
      Desktop OpenGL

    Description

      Compiled with 5.2 Alpha the window is fully transparent and you can see the desktop.

      Another strange effect happens if you change the window state of the widget to full screen (Qt::WindowFullScreen). It turns to full opaque black (as in 5.1.1)

      Code to reproduce :

      int main(int argc, char *argv[]) {
   QApplication a(argc, argv);

   QGLFormat glFormat(QGL::Rgba | QGL::DoubleBuffer | QGL::DepthBuffer | QGL::AlphaChannel);
   QGLWidget widget(glFormat, NULL, NULL, 0);

   widget.activateWindow();
   widget.show();

   return a.exec();
}

      Attachments

        Issue Links

          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-28214 Cannot make transparent (translucent) background for QQuickView

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

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-34376 Windows/Desktop OpenGL: QGLWidget based main window is invisible if configured with format QGL::AlphaChannel and Qt::FramelessWindowHint

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
          replaces

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-36739 QWindow with OpenGL alpha blending becomes translucent

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed
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              peppe Giuseppe D'Angelo
              dirkneuber Dirk Neuber
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              Dates

                Created:
                Updated:
                Resolved:

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