[vtkusers] Issues with QVTKOpenGLWidget and VTK8.2

[Geoff Woodcock]

Hi,

We have an application based on Qt and Vtk. It runs well on VTK8.1 However, after upgrading to VTK8.2, we experience problems when we first call vtkRenderer::Render(). This call ultimately ends up calling vtkOpenGLState::CheckState, and this fuction emits a lot of error messages which are listed below.

I understand that the vtkOpenGLState is not initialized properly, but I can't seem to figure out what the proper order of initialization is supposed to be. I am calling QSurfaceFormat::setDefaultFormat() before creating my QApplication object. The render window initialization is pretty straightforward:

     _vtkWidget = new QVTKOpenGLWidget((QWidget *)nullptr);
     _vtkWidget->setEnableHiDPI(true);

   // VTK Renderer
    _renderer = vtkSmartPointer<vtkRenderer>::New();
    _renderer->SetLayer(0);

    _rendererOverlay = vtkSmartPointer<vtkRenderer>::New();
    _rendererOverlay->SetLayer(1);

    // VTK/Qt wedded
    vtkNew<vtkGenericOpenGLRenderWindow> renderWindow;

    _qvtkWidget>SetRenderWindow(renderWindow);
    renderWindow->SetNumberOfLayers(2);
    renderWindow->AddRenderer(_renderer);
    renderWindow->AddRenderer(_rendererOverlay);

The vtkOpenGLState::Initialize function is never called


I have tried switching from QVTKOpenGLWidget to QVTKOpenGLNativeWidget, which fixes the state initialization problems (but I am unable to use it, since it causes problems with line drawing as documented here: https://gitlab.kitware.com/vtk/vtk/issues/17154).

So the code works with 8.1 and also works with QVTKOpenGLNativeWidget.

Can someone help me understand what I am doing wrong with the initialization?


Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 95
Error in cache state for GL_DEPTH_WRITEMASK

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 106
Error in cache state for GL_COLOR_WRITEMASK

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 124
Error in cache state for GL_CULL_FACE

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 131
Error in cache state for GL_MULTISAMPLE

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 144
Error in cache state for GL_STENCIL_TEST

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 162
Error in cache state for GL_VIEWPORT

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 173
Error in cache state for GL_SCISSOR_BOX

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 179
Error in cache state for GL_CULL_FACE_MODE

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 185
Error in cache state for GL_DEPTH_FUNC

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 191
Error in cache state for GL_BLEND_SRC_RGB

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 197
Error in cache state for GL_BLEND_SRC_ALPHA

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 203
Error in cache state for GL_BLEND_DST_RGB

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 209
Error in cache state for GL_BLEND_DST_ALPHA

Generic Warning: In d:\projects\flow-2\tools\conan\thirdparty\build\libvtk\rendering\opengl2\vtkopenglstate.cxx, line 222
Error in cache state for GL_COLOR_CLEAR_VALUE



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