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<body><span class="vcard"><a class="email" href="mailto:kenneth@whitecape.org" title="Kenneth Graunke <kenneth@whitecape.org>"> <span class="fn">Kenneth Graunke</span></a>
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<a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - [SNB Bisected]Piglit spec/ARB_texture_float/multisample-formats 2 GL_ARB_texture_float fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70601">bug 70601</a>
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<td>eric@anholt.net, stereotype441@gmail.com
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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - [SNB Bisected]Piglit spec/ARB_texture_float/multisample-formats 2 GL_ARB_texture_float fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70601#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - [SNB Bisected]Piglit spec/ARB_texture_float/multisample-formats 2 GL_ARB_texture_float fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70601">bug 70601</a>
from <span class="vcard"><a class="email" href="mailto:kenneth@whitecape.org" title="Kenneth Graunke <kenneth@whitecape.org>"> <span class="fn">Kenneth Graunke</span></a>
</span></b>
<pre>Hey Paul,
I'm really stumped by this bug. On Sandybridge, performing a BLORP blit from
either I32_FLOAT or L32_FLOAT to R32_FLOAT appears to subtly break - the
rendered image looks mostly correct, but it's all blocky, and fails at the
edges. (See the images attached to the bug.) The 16-bit formats appear to
work fine.
Forcing the source and destination buffers to both be R32_FLOAT appears (via
the attached patch) makes it work correctly as well. This makes no sense to
me, as sampling from I32_FLOAT should just return <R, R, R, R>, and writing to
a R32_FLOAT buffer should ignore all but the R component anyway...
Do you have any ideas?</pre>
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