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anathema's picture

GL.GetString(StringName.Version) returning wrong value

Posted Sunday, 9 January, 2011 - 11:10 by anathema
Project:The Open Toolkit library
Version:all versions
Component:Code
Category:support request
Priority:normal
Assigned:Unassigned
Status:closed
Description

Raising this as a support request rather than a bug, as I suspect it's me doing something wrong :-)

Running the above code returns a string of "2.1.2" on my system, and getting ShadingLanguageVersion returns "1.20 NVIDIA via Cg compiler". The thing is, my card supports OpenGL 3.2.0 and GLSL 1.50...

I've confirmed that glview returns the correct values. Anyone know what's going on here? :-)


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c2woody's picture

#1

Posted Sunday, 9 January, 2011 - 12:31 by c2woody

What context did you request?

anathema's picture

#2

Posted Sunday, 9 January, 2011 - 12:47 by anathema

I just created a GLControl with the parameter-less constructor:

GLControl glc = new GLControl();
glc.MakeCurrent();
string version = GL.GetString(StringName.Version);

the Fiddler's picture

#3

Posted Sunday, 9 January, 2011 - 12:58 by the Fiddler

Since 3.1+ is not backwards compatible with 2.1, drivers will give you a 2.1 context unless you request a higher one (otherwise existing applications would break). For instance, GL.GetString(StringName.Version) is not even valid in 3.1. You need to use:

int major, minor;
GL.GetInteger(GetPName.Major, out major);
GL.GetInteger(GetPName.Minor, out minor);

OpenTK provides constructors that allow you to specify the desired OpenGL version.

anathema's picture

#4

Posted Sunday, 9 January, 2011 - 13:08 by anathema
Status:open» closed

Ah :-) I thought it might be something like that. Many thanks!

c2woody's picture

#5

Posted Sunday, 9 January, 2011 - 13:18 by c2woody
Quote:

For instance, GL.GetString(StringName.Version) is not even valid in 3.1.

Can't find any source for that, it is fully supported in forward compatible contexts (except the EXTENSIONS checking) and works fine.

The returned string depends on the requested context though, as The Fiddler wrote the default context is 1.x/2.x compatible and thus the returned version is limited.

the Fiddler's picture

#6

Posted Sunday, 9 January, 2011 - 14:23 by the Fiddler

Ah, you are right. GL.GetString(StringName.Extensions) is the deprecated one, not Version.