go-gl/gl — pull request #137 by kiryl (2014-03-06 23:29:45+00:00)
Title: Implement bindings for debug output feature

This patch implements ARB_debug_output/KHR_debug. It's was an extension
before and now it's in core since OpenGL 4.3.

Interface is not totally match C version:
- no userParam passed to glDebugMessageCallback();
- glGetDebugMessageLog() imeplemented as GetNextDebugMessage();

Any suggestions about interface or implementation are welcome.