I just commited this. usage: 1. start a GL demo 2. use 'xwininfo' to get the app's window ID 3. run 'glxsnoop <window id>' 4. press z/s/b/f to view the app's z, stencil, back, front buffer
I tested with the 7.0.2 i915 DRI driver and it doesn't work, unfortunately. Nor will it work with the Xlib driver (obviously).
With NVIDIA's driver it works as expected, mostly. Sometimes viewing the Z or stencil buffer results in a corrupted image (sample attached). Not sure if this is just a bug or I'm just getting lucky when it does work.
-Brian
<<inline: glxsnoop.png>>
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