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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #1 from Daniel Scharrer <daniel at constexpr.org> ---
(I fail at bugzilla today :/)

On some maps in Sanctum 2 I'm getting black squares in some spots.

The squares always seem to be the same screen-space size (120×120 pixels, some
are wider/taller but that could just be overlapping squares), but are centered
around fixed positions in the game world and not aligned to a screen-space
grid.

Moving the camera or character can cause some of them to disappear/reappear.

The squares don't just cover the world geometry, but also the user interface
including the hud and menu, and even loading screens.

This happens with and without R600_DEBUG=nohyperz. It does not happen with
fglrx 14.9.

It doesn't happen on all maps, but for those affected (e.g. Trainstation) it is
100% reproducible.

Lowering texture quality in the game's options reduces the number of black
squares. For the screenshots I had all other settings at their lowest value
(except bloom turned on as that is required for the game to render correctly,
even on other drivers).

I have tried to create an apitrace showing the problem but glretrace crashes
inside glDrawRangeElements() shortly before getting to the buggy part when
replaying with either radeonsi or fglrx. I can still provide it if anyone is
interested, but it's probably not appropriate to link here.

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