Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-46219

Crash when using multisampling with software OpenGL on Windows

    XMLWordPrintable

Details

    Description

      If you set the preferred number of samples using QSurfaceFormat::​setSamples() and run the application with Software OpenGL on Windows, then the application crashes with

      int __cdecl GDI::choosePixelFormat(struct HDC__ *,const class QSurfaceFormat &,const struct QWindowsOpenGLAdditionalFormat &,struct tagPIXELFORMATDESCRIPTOR *): Attempted to use GDI functions with a non-opengl32.dll library
      QWindowsGLContext::QWindowsGLContext: Unable find a suitable pixel format.
      QOpenGLWidget: Failed to create context
      QOpenGLFunctions created with non-current context
      ASSERT: "QOpenGLFunctions::isInitialized(d_ptr)" in file c:\work\build\qt5_workdir\w\s\qtbase\include\qtgui\../../src/gui/opengl/qopenglfunctions.h, line 1058
      

      This problem came up when an application with dynamic loading of graphics driver was run in an environment with only software OpenGL.

      The attached simplified example application reproduces the problem.

      Attachments

        1. qtbug46219.zip
          0.8 kB
          Qt Support
        No reviews matched the request. Check your Options in the drop-down menu of this sections header.

        Activity

          People

            lagocs Laszlo Agocs
            qtcomsupport Qt Support
            Votes:
            0 Vote for this issue
            Watchers:
            4 Start watching this issue

            Dates

              Created:
              Updated:
              Resolved:

              Gerrit Reviews

                There are no open Gerrit changes