Hello Elvis, Haswell and Ivy Bridge indeed ring a bell here. We have a lot of WebEngine bug reports that affect these GPUs only. Can you create a bug report please?
OpenGL 3.2 context raises an eyebrow here, because just yesterday I have seen a qtdiag output from a Debian 7 machine (2013 isn't THAT long ago) with mesa 8.0.5, which only supports OpenGL 3.0. Kind regards On 21.06.2017 11:38, Elvis Stansvik wrote: > This may or may not be a Qt issue. > > I'm trying to help the VTK folks narrow down a problem with their new > QVTKOpenGLWidget, which is a newly-introduced QOpenGLWidget-based > class for letting VTK render into a QOpenGLWidget. > > The problem manifests itself as volume renderings not showing up on > Windows machines with Ivy Bridge (e.g HD4000) and Haswell (e.g. > HD4600) Intel GPUs when using the new class. VTKs volume rendering is > done using float textures. > > Volume renderings works fine on the same machines when using "plain" > VTK. This is when VTK itself sets up the OpenGL context (using GLEW I > believe), but apart from that, the rendering pipeline is exactly the > same I think. This is what leads me to believe that the issue is > something specific to QOpenGLWidget, or to how VTK uses it. > > VTK requests a OpenGL 3.2 core context, and through some debugging, > I've verified that VTK is actually getting the context that it is > requesting. > > The issue is reported by me, here at VTKs GitLab: > > https://gitlab.kitware.com/vtk/vtk/issues/17058 > > The report contains some more information, such as the generated > fragment shader that VTKs volume rendering backend is using, and a GL > report from the problematic machine. > > Does this specific issue (float texture rendering not showing up on > these semi-old Intel GPUs) ring a bell to anyone else? > > Many thanks for any tips/pointers/leads on how to debug this. > > I'm really interested in getting this issue in VTK fixed, since > laptops with these GPUs are quite common. It's also affecting recent > versions of ParaView, which has (just like me) recently ported to the > new QVTKOpenGLWidget. > > Elvis > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest -- Viktor Engelmann Software Engineer The Qt Company GmbH Rudower Chaussee 13 D-12489 Berlin viktor.engelm...@qt.io +49 151 26784521 http://qt.io Geschäftsführer: Mika Pälsi, Juha Varelius, Mika Harjuaho Sitz der Gesellschaft: Berlin, Registergericht: Amtsgericht Charlottenburg, HRB 144331 B The Future is Written with Qt www.qtworldsummit.com _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
