Comment 4 for bug 1504387

There appear to be two potential problems here. One is that Weston tries to use GL_EXT_abgr in ES even though it is not an ES extension. The second is that mesa advertises it and then falls over when you try to use it. If we weren't advertising it, Weston would fall back to other paths and be OK. I see two options:

 1) Actually support the extension even though it isn't technically an ES extension.
 2) Stop advertising it.

I'm going to hazard a guess and say that mesa is probably the only ES driver to support GL_EXT_abgr.

Thoughts?