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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Dota2 shimmering artifacts on Mesa 10.0.1 on Iris Pro graphics"
href="https://bugs.freedesktop.org/show_bug.cgi?id=74700#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Dota2 shimmering artifacts on Mesa 10.0.1 on Iris Pro graphics"
href="https://bugs.freedesktop.org/show_bug.cgi?id=74700">bug 74700</a>
from <span class="vcard"><a class="email" href="mailto:idr@freedesktop.org" title="Ian Romanick <idr@freedesktop.org>"> <span class="fn">Ian Romanick</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=74700#c3">comment #3</a>)
<span class="quote">> I have observed that disabling GL_DITHER will
> remove this undesirable rendering.</span >
I won't even ask how you noticed that...
<span class="quote">> 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.</span >
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.</pre>
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