[osg-users] Crasch in extension->createShader when using remote desktop (Windows)

[Andrew Cunningham]

Hi,
I connect using Microsoft RDP from Windows 10 to Windows 10 and from Mac OS
X 10.15 to Windows 10 and I can verify that my shaders work fine using OSG
3.6.4 when running my application over RDP.
The Windows 10 machine I am connecting to is using an nVidia graphics card
and as far as OSG is concerned it sees OpenGL as if I was running "locally"

However, if you are connecting to a Windows 7 machine ( even if it has the
same nVidia card), however, it all falls apart. Using RDP OSG only sees the
default MS Windows OpenGL, v1.1... thus shaders won't work and OSG 3.6.4 is
non-functional.

Andrew

On Tue, Dec 17, 2019 at 6:30 AM Anders Backman <andersb at cs.umu.se> wrote:

> Hi all.
> Using OSG 3.6.4, Windows 10.
>
> Not sure what the current state of the world regarding Remote Desktop and
> OpenGL is.
> Perhaps someone can share some light onto this.
>
> If I run an application that use shaders over remote desktop from one
> windows machine to another I get:
>
> c:\build\VS2017\x64\osg\bin>osgsimpleshaders.exe
> Windows Error #127: [Screen #0] ChooseMatchingPixelFormat() -
> wglChoosePixelFormatARB extension not found, trying GDI. Reason: The
> specified procedure could not be found.
>
> Rendering in software: pixelFormatIndex 3
> Warning: detected OpenGL error 'invalid enumerant' at Before
> Renderer::compile
>
> > crash.
>
> This does not happen when using fixed functionality only, for example
> running osgviewer with some standard obj-model works just fine.
> However, as soon as a shader is requested, OSG crashes:
>
> _glShaderHandle = _extensions->glCreateShader( shader->getType() );
>
>   Exception thrown at 0x0000000000000000 in agxViewer.exe: 0xC0000005:
> Access violation executing location 0x0000000000000000.
>
>
>   0000000000000000() Unknown
> > osg160-osg.dll!osg::Shader::PerContextShader::PerContextShader(const
> osg::Shader * shader, unsigned int contextID) Line 533 C++
>   osg160-osg.dll!osg::Shader::ShaderObjects::createPerContextShader(const
> std::basic_string<char,std::char_traits<char>,std::allocator<char> > &
> defineStr) Line 426 C++
>   osg160-osg.dll!osg::Shader::getPCS(osg::State & state) Line 470 C++
>
> Anyone with more info on this?
> Is there any way around this?
>
> --
> __________________________________________
> Anders Backman, HPC2N
> 90187 Umeå University, Sweden
> anders at cs.umu.se http://www.hpc2n.umu.se
> Cell: +46-70-392 64 67
> _______________________________________________
> osg-users mailing list
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>
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