https://bugs.freedesktop.org/show_bug.cgi?id=57875

--- Comment #6 from Stefan Dösinger <stefandoesinger@gmx.at> ---
I can reproduce the bug, and after a quick investigation it seems to be a
legitimate problem how depth clamping is handled. The application enables it,
it enables it only if the extension is available and if I don't set the GPUs
CLIP_DISABLE flag but keep the extension the bugs go away(so having the
extension doesn't trigger a different codepath that is broken in some other
way).

Marek, in 09109c11d9efd78c0f87fc55911e03eda5fd980b you mention
GB_TILE_CONFIG.Z_EXTENDED. From looking at the code of this application and the
comments therein, I suspect the clamping part of GL_ARB_depth_clamp is required
here. Do you have some code left over from your previous DEPTH_CLAMP
experiments?

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