[Nouveau] [Bug 91056] The Bard's Tale (2005, native) has rendering issues

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91056

--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Created attachment 116707
  --> https://bugs.freedesktop.org/attachment.cgi?id=116707&action=edit
provisional fix

OK, so this patch appears to fix it. The shaders at the end of that opt trace
have

00000028: b5000409 08000780     add rn f32 $r2 $r2 neg c0[$a1]
00000040: b500060d 08004780     add rn f32 $r3 $r3 neg c0[$a1+0x4]

etc in them. Which seems innocuous enough, but... something about it is bad.
Perhaps the neg + indirect. Perhaps just indirect. Perhaps... who knows. Needs
testing.

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