[Bug 74700] Dota2 shimmering artifacts on Mesa 10.0.1 on Iris Pro graphics

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74700

--- Comment #5 from Ian Romanick <idr at freedesktop.org> ---
(In reply to comment #3)
> I have observed that disabling GL_DITHER will
> remove this undesirable rendering.

I won't even ask how you noticed that...

> DOTA2 is rendering to a framebuffer bound to an
> RGB10_A2 texture when the corruption first appears
> to happen. The undesirable rendering appears on the
> alpha channel.

I think dithering is useless on 10-bit colors (because there are enough steps
in the gradient already), and it's actively harmful on 2-bit components
(because there aren't enough!).  Let's just always disable dithering on
RGB10_A2.  There may be a couple other color formats where we should also
disable it.

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