GLX_EXT_include_inferiors (was Re: compiz on aiglx)

[Ian Romanick]

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Kristian Høgsberg wrote:

> Overview
> 
>     This extension introduces a new FBConfig attribute,
>     GLX_INCLUDE_INFERIORS_EXT.  Creating a context with an FBConfig that has
>     GLX_INCLUDE_INFERIORS_EXT set will prevent inferiors (child windows) from
>     clipping output to the drawable currently associated with the context.

Would it be possible to elaborate on this a bit?  I'm not really sure
what this is even intended to do or why anyone would want to use it.
This isn't to say that I don't think it's useful, more to say that I
don't get it.

If I have window A and a child window B, what happens if I draw to
window A?  Does this just provide a guarantee that if B obscures pixel
x,y of A that I can later read back (e.g., using glReadPixels) x,y and
get the result that I drew?  Does this mean that result of drawing x,y
of A gets "broadcast" somehow to B?
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