[Bug 95412] black overlay on The Talos principle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95412

--- Comment #2 from Grazvydas Ignotas <notasas at gmail.com> ---
The game calls glClipControl(origin = GL_LOWER_LEFT, depth = GL_ZERO_TO_ONE)

Then gen6_clip_state.c sets the GEN6_CLIP_API_D3D bit, and that seems to cause
the issue. I wonder if that bit actually means GL_ZERO_TO_ONE, the
documentation isn't very clear, and only SNB doc lists the description for '1'
value, newer ones don't.

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