[Bug 70601] [SNB Bisected]Piglit spec/ARB_texture_float/multisample-formats 2 GL_ARB_texture_float fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70601

Kenneth Graunke <kenneth at whitecape.org> changed:

           What    |Removed                     |Added
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                 CC|                            |eric at anholt.net,
                   |                            |stereotype441 at gmail.com

--- Comment #5 from Kenneth Graunke <kenneth at whitecape.org> ---
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?

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