[Interest] Problem with float texture rendering in QOpenGLWidget on Ivy Bridge/Haswell Intel GPUs on Windows

Elvis Stansvik elvstone at gmail.com
Wed Jun 21 15:16:07 CEST 2017

2017-06-21 14:23 GMT+02:00 Viktor Engelmann <viktor.engelmann at qt.io>:
> On 21.06.2017 13:22, Elvis Stansvik wrote:
>> ...
>> However, I was hesitant to create a Qt bug report as I'm not at all
>> sure yet that it's a Qt problem. There's still a possibility that it's
>> a bug in the VTK rendering engine (though it does work when VTK is
>> configured to use GLEW).
> I actually guess it's a driver issue, but it would be nice to have a
> dedicated bug report anyways, so we'd have a central point for tracking
> the knowledge on the issue (at least, we could mark said bug reports as
> duplicates of the new one, improving our statistics ;-) )

Alright. I'll make a report then.

But just to be clear, the same VTK test case works fine on the same
machine when running with "plain" VTK classes, where the rendering is
set up using GLEW. It is only when running the test case with
QVTKOpenGLWidget (which derives QOpenGLWidget) that the problem

So I'm not sure it's a driver issue, or rather: If it is a driver
issue, it must be one that manifests itself only when using

>> ...
>> The problem only seem to occur on Windows. It's working fine on my own
>> Kubuntu 16.04 laptop (HD 4400 GPU).
> yes, our bug reports also only affect windows (mostly 32 bit windows 7)

Okay. My test system is Windows 7 as well (with latest available Intel
driver), although others on the vtk-developers list could reproduce on
Windows 8.1.


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