Missing OpengGL 4.2 function: glMemoryBarrier

[franolichdesign]

I'm learning OpenGL and SharpGL together so please forgive me if any aspect of my query is inaccurate.

I am trying to write a compute shader that updates a texture before that texture is used by a fragment shader. I cannot calculate the pixel colours within the fragment shader since a column of pixels are generated by an iterative algorithm i.e. a pixel colour cannot be determined independently of others.

It seems that after calling glDispatchCompute, I need to call glMemoryBarrier before using the texture since the compute shader would otherwise execute asynchronously. However I cannot find glMemoryBarrier (OpenGL 4.2) or the associated constants defined in the current version of SharpGL.OpenGL (3.1.1.0).

I have considered several solutions that I could implement but in all cases there are issues:

• Derive a class from OpenGL and add a MemoryBarrier method. This will not work since my class would not be used by SharpGL.WPF.OpenGLControl.
• Create a MemoryBarrier extension method for the OpenGL class. This does not work either as the extension method does not have access to private/protected members of OpenGL such as PreGLCall.
• Recompile SharpGL and relevant dependencies myself with an added MemoryBarrier method. While this should be straightforward from what I can tell, I would have to reapply my changes and recompile every time there is a new version of SharpGL.
• Make the required changes as above but also commit the changes to the SharpGL repository. I would be happy to do this but it would be my first code contribution to an open source project so any tips/guidelines would be most welcome - for example I have no idea what testing/verification procedures are in place for this project.

Alternatively, if it is easier for a project maintainer to release an updated version of SharpGL (and Nuget packages) with the added function, this would also be much appreciated.

Cheers,
Fran