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  1. Qt
  2. QTBUG-66668

REG->5.11Beta1 : Windows: Quick nano browser example crashes

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    • Icon: Bug Bug
    • Resolution: Fixed
    • Icon: P1: Critical P1: Critical
    • 5.11.0 RC 1, 6.2
    • 5.11.0 Beta 1
    • WebEngine
    • None
    • Windows 10, MSVC17/64bit
    • e5e0bb2631e6b0e207a6c98e1a328c8da958be9c 099cdde2717aa09800e2915eac2d2c76e6216d5f 

      [5440:10416:0226/094132.047:ERROR:gl_surface_wgl.cc(372)] wglCreatePbufferARB not available.
[5440:10416:0226/094132.047:ERROR:gl_surface_qt.cpp(751)] Requested OpenGL implementation is not supported. Implementation: 1

      This happens for both -opengl desktop and -opengl dynamic builds. There's an ordering problem in how we initialize our OpenGL extensions.

      The logic in GpuInit::InitializeInProcess() (see https://code.woboq.org/qt5/qtwebengine/src/3rdparty/chromium/gpu/ipc/service/gpu_init.cc.html ) is the following:

        if (!gl::init::InitializeGLNoExtensionsOneOff()) {
    VLOG(1) << "gl::init::InitializeGLNoExtensionsOneOff failed";
    return;
  }
// ..
  gpu::CollectContextGraphicsInfo(&gpu_info_);
  gpu_feature_info_ = gpu::ComputeGpuFeatureInfo(gpu_info_, command_line);
// ..
  if (!gl::init::InitializeExtensionSettingsOneOffPlatform()) {
    VLOG(1) << "gl::init::InitializeExtensionSettingsOneOffPlatform failed";
  }

      THat is, we first initialize OpenGL without extensions, then try to query GPU features, and then only initialize extensions.

      However, ComputeGpuFeatureInfo does create an OpenGL surface for querying the extensions, and on Windows this OpenGL context requires wglCreatePbufferARB to be available (see GLSurfaceQtWGL::Initialize).

        1. NanoBrowserCrashScreenShot.jpg
          NanoBrowserCrashScreenShot.jpg
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        2. qtbug66668_qtdiag.txt
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        3. qtbug66668_stack.txt
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            qt_webengine_team Qt WebEngine Team
            kleint Friedemann Kleint
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              Created:
              Updated:
              Resolved:

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