[vtk-developers] OpenGL backend - 1.1 vs 2.0

[Andras Lasso]

VTK's OpenGL2 backend works very well through RDP - including volume rendering, even using a client without GPU. The only limitation (an important one) is that you have to start your application before connecting through RDP.

The only thing to figure out is how to convince applications to start “normally” when connected through RDP.

Andras

From: vtk-developers [mailto:vtk-developers-bounces at vtk.org] On Behalf Of Ken Martin
Sent: Wednesday, May 10, 2017 8:51 AM
To: Vladimir Engelgardt <v.engelgardt at gmail.com>
Cc: VTK Developers <vtk-developers at vtk.org>
Subject: Re: [vtk-developers] OpenGL backend - 1.1 vs 2.0

If you have to support RDP (as opposed to other solutions), and you have to support clients that lack a GPU etc, then you could build your application against Mesa (with OpenSWR or llvm as the renderer) and I believe it should work everywhere including RDP.

Ideally at run time we could detect this and pick Mesa/Hardware but I don't think anyone has had time to dig into how difficult that would be.

From what I could find nvidia only supports hardware RDP on their professional cards. It would certainly be nice if vendors would do what they can to support modern OpenGL more broadly in cases like this.





On Wed, May 10, 2017 at 6:14 AM, Vladimir Engelgardt <v.engelgardt at gmail.com<mailto:v.engelgardt at gmail.com>> wrote:
Hi,

Problem description: Application uses VTK 7.0 (OpenGL 2 module) for
rendering on Windows platform. But the problem is, that OpenGL 2 has limited
support over Microsoft's Remote Desktop. RDP is a must for our application
(VNC, TeamViewer is not an option). On Win 10 there is an option called 'Use
hardware drivers over RDP' and it works, but for limited set of video
adapters - AMD, Integrated Graphics from Intel and NVIDIA (Tesla, Grid
only).

Is there any workaround for this problem, i.e. detect GL version at runtime
and use 1.1 or 2.0? If no, we are going to switch for OpenGL 1.1.

We concern about OpenGL 1.1 support in future versions of VTK. Is it going
to be supported and how long?

Best Regards,
Vladimir.



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