Need sample program or tutorial

I fail miserably to write a direct rendering program. I think DRI is
properly installed on my system, at least glxgears confirms Direct
rendering: Yes. My program initializes all kind of things but when it
comes to make something current I get probably confused between all
contexts and windows/drawables.

Is there anywhere a tutorial that tells me how to write a DRI client
program (not how to compile and install DRI) or a very simple program
that I could have a look at.

Appreciate any pointers.
Enno Fennema

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