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eugene.chepurnykh's picture

Get OpenGL version before Application.Run.

Posted Wednesday, 23 September, 2009 - 13:05 by eugene.chepurnykh in

Does anybody knows, is it possible to get OpenGL version before Application.Run.
There is a requirement - check OpenGL version before application run. Who knows any tricks for that?

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the Fiddler's picture

Re: Get OpenGL version before Application.Run.

Posted Wednesday, 23 September, 2009 - 13:34 by the Fiddler

To check the OpenGL version you need to create an OpenGL context. To create an OpenGL context, you need to create a window.

Possible solutions (both should work but I have tested neither):

  • Create a GLControl, query the version and destroy the control before you call Application.Run.
  • Create a NativeWindow, create a GraphicsContext using its WindowInfo, query the version and destroy both the context and the window prior to calling Application.Run.
eugene.chepurnykh's picture

Re: Get OpenGL version before Application.Run.

Posted Wednesday, 23 September, 2009 - 15:25 by eugene.chepurnykh

To Fiddler:

Thank you. The answer was so simple.... I've tried to make WinGLControl, created context and windowInfo, executed MakeCurrent - but nothing good at the end.

This is fully working code.

        string version = string.Empty;
         try
            {
                GLControl control = new GLControl();
                version = GL.GetString(StringName.Version);
            }
            catch (Exception ex)
            {
                return false;
            }
the Fiddler's picture

Re: Get OpenGL version before Application.Run.

Posted Wednesday, 23 September, 2009 - 15:29 by the Fiddler

Don't forget to dispose the GLControl and reclaim the resources it uses:

         string version = string.Empty;
         try
         {
             using (GLControl control = new GLControl())
             {
                 version = GL.GetString(StringName.Version);
             }
         }
         catch (Exception ex)
         {
             return false;
         }
eugene.chepurnykh's picture

Re: Get OpenGL version before Application.Run.

Posted Wednesday, 23 September, 2009 - 16:23 by eugene.chepurnykh

Thank you again. Another part of rexeg mystery.
If somebody wants to parse Version of OpenGL I suggest next pattern:

           const string REGEX_VERSION_PATTERN = @"(\d+)\.(\d+)\.*(\d*)";
 
            Regex regex = new Regex(REGEX_VERSION_PATTERN);
            Match match = regex.Match(version);
            if (!match.Success || match.Groups.Count < 3)
            {
                return false;
            }
            int majourVersion = Convert.ToInt32(match.Groups[1].Value);
            int minorVersion = Convert.ToInt32(match.Groups[2].Value);
            if (majourVersion < GlobalConsts.OPENGL_LIB_MIN_MAJOUR_VERSION 
                && minorVersion < GlobalConsts.OPENGL_LIB_MIN_MINOR_VERSION)
            {
                return false;
            }