[Bug 86663] [radeonsi] Black squares in Sanctum 2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86663

--- Comment #4 from Daniel Scharrer <daniel at constexpr.org> ---
Created attachment 109946
  --> https://bugs.freedesktop.org/attachment.cgi?id=109946&action=edit
Deadfall Adventures menu screen

I have also noticed similar black squares in the menu screen of Deadfall
Adventures. In that case, changing the texture quality to the lowest setting
gets rid of them. Changing all other video settings from highest to lowest
reduces the size of the squares from ~104² pixels to 50² pixels.

I guess the root cause might just be single NaN/negative fragments that then
get propagated by a subsequent screen-space filter into a whole square?

Neither game has any VGPR register spilling warnings in their console output so
it's not that.

Oh, and this is all with Mesa 10.5.0-devel (git-fecae46), but I remember also
seeing this with older versions.

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