Hello Carsten,

>> I'm wondering if nobody ever did a readback of the Stencilbuffer, or
>
> it's quite possible, since the stencil is usually only needed when
> trying to achieve a specific effect and even then readback is often not
> required - for performance reason most people will usually try quite
> hard to leave the data on the GPU only ;)
>

how can I get access to the stencil data from the image?
I got the packed depth/stencil image, but how can I readout the stencil data?
Is there any functionality available for that?

>> if there is an simplier approach to reach this goal, that I'm missing
>> here.
>
> sorry, I've lost a bit track of this and what parts you got working in
> the meantime. What is the problem you are currently stuck on? The
> readback of the combined depth/stencil buffer or something before that
> (like setting up the FBO with the buffers you need) ?
>

The setup of the FBO should be ok by know, there are no warnings any
more, but I couldn't test it.
Frankly because I don't know how.

I need to read the stencil values out and there I could see, if it's
working or not.

Thanks a lot,
Constantin

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