[vtkusers] Need information about "Invalid pixel format, no opengl support" message.

Mon Mar 14 10:00:34 EDT 2016

The old OpenGL backend will work with OpenGL version 1.1, while the new
OpenGL backend requires something closer to OpenGL version 2.1 to 3.2 (or
later).

Windows only comes with OpenGL version 1.4 (a software renderer). It is up
to the hardware providers to supply hardware drivers. Pretty much anything
released by Nvidia/AMD/Intel in the past 5 years will support  OpenGL 3.2
or later. Earlier than that and it becomes a bit more hit or miss.

Yes it depends on the graphics card. But since Intel started building in
OpenGL support into their CPUs you can generally count on all recent
(IvyBridge maybe SandyBridge or later) systems having sufficient OpenGL
support for  the new backend.  There is a method
renderWindow->SupportsOpenGL() that will test if a system meets the minimum
requirements for the new backend,

I mentioned  "one provided to VTK" because sometimes developers create
their own opengl context (the context determines what level of OpenGL is
provided)  and then tell VTK to use it. That will only work  if they give
VTK a context that includes support for 3.2. Normally VTK  creates its own
context so it makes sure to create the right one.

I  do not know much about Qt.

Thanks
Ken

On Mon, Mar 14, 2016 at 4:16 AM, Rakesh Patil <rakesh.p at tataelxsi.co.in>
wrote:

> Hi Ken Martin,
>
>
> I believe I understood the core reason as why this message is displayed. I
> need some more details.
>
>
> 1) In what way OpenGL backend is different from the OpenGL2 backend for
> VTK 6.3. Knowing that QVTKWidget will be deprecated, what pre-requisite
> conditions needs to be considered to stick myself working with QVTKWidget
> on various system?
>
> 2) What exactly do you mean, when you say *"**one was provided to VTK
> that did not include opengl support"*. I guess all the latest Windows OS
> do come with OpenGL version greater than 1.1. So I think all the drivers
> must have OpenGL support right? Correct me if I am wrong.
>
> 3) Does this functionality really vary from one graphics card to another?
> I mean does it depend on the graphics card also? If so, how will I know
> whether my graphics card supports OpenGL backend or OpenGL2 backend?
>
>
> Thank You
>
>
> Warm Regards
>
> Rakesh Patil
> ------------------------------
> *From:* Ken Martin <ken.martin at kitware.com>
> *Sent:* Saturday, March 12, 2016 1:03 AM
> *To:* Rakesh Patil
> *Cc:* vtkusers at vtk.org
> *Subject:* Re: [vtkusers] Need information about "Invalid pixel format,
> no opengl support" message.
>
> I believe you gave the specs for your desktop as opposed to the laptop.
>
> That message occurs on windows on the old OpenGL backend (and the OpenGL2
> backend for VTK 6.3)  It indicates that VTK tried to setup a device context
> for rendering but the device did not support opengl, either because VTK
> failed to find a suitable device or because on was provided to VTK that did
> not include opengl support.
>
> Thanks
> Ken
>
>
>
> On Wed, Mar 9, 2016 at 7:22 AM, Rakesh Patil <rakesh.p at tataelxsi.co.in>
> wrote:
>
>> Hi VTK users,
>>
>>
>> I am facing a strange issue. I am using QVTKWidget in my application and
>> it works very well on my desktop computer. The same code when I try to
>> compile on my laptop it throws me this error message:
>>
>>
>> "Invalid pixel format, no opengl support"
>>
>>
>> I would like to know what are the scenarios in which VTK throws
>> this message. Whether there is any dependency on various versions of
>> Windows OS? I believe it should not be.  Below is the system information
>> where I get this error:
>>
>>
>> OS Name: Microsoft Windows 8.1 Pro
>> Version: 6.3.9600 Build 9600
>> OS Manufacturer: Microsoft Corporation
>> System Manufacturer: Dell Inc.
>> System Model: Precision T1700
>> System Type: x64-based PC
>> Processor Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz, 3592 Mhz, 4 Core(s),
>> 8 Logical Processor(s)
>> Installed Physical Memory (RAM): 32.0 GB
>> Total Virtual Memory: 36.7 GB
>> Display adapter: NVIDIA Quadro K620
>>
>> Note: I am not using QVTKWidget2. Kindly give some feedback as early as
>> possible.
>>
>> Thank You
>>
>> Warm Regards
>>
>> Rakesh Patil
>>
>>
>>
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the VTK FAQ at:
>> http://www.vtk.org/Wiki/VTK_FAQ
>>
>> Search the list archives at: http://markmail.org/search/?q=vtkusers
>>
>> Follow this link to subscribe/unsubscribe:
>> http://public.kitware.com/mailman/listinfo/vtkusers
>>
>>
>
>
> --
> Ken Martin PhD
> Chairman & CFO
> Kitware Inc.
> 28 Corporate Drive
> Clifton Park NY 12065
> 518 371 3971
>
> This communication, including all attachments, contains confidential and
> legally privileged information, and it is intended only for the use of the
> addressee.  Access to this email by anyone else is unauthorized. If you are
> not the intended recipient, any disclosure, copying, distribution or any
> action taken in reliance on it is prohibited and may be unlawful. If you
> received this communication in error please notify us immediately and
> destroy the original message.  Thank you.
>

-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

This communication, including all attachments, contains confidential and
legally privileged information, and it is intended only for the use of the
addressee.  Access to this email by anyone else is unauthorized. If you are
not the intended recipient, any disclosure, copying, distribution or any
action taken in reliance on it is prohibited and may be unlawful. If you
received this communication in error please notify us immediately and
destroy the original message.  Thank you.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://public.kitware.com/pipermail/vtkusers/attachments/20160314/3d6c9565/attachment.html>