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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_NEW "
title="NEW - [CTS] GTF-GL46.gtf32.GL3Tests.packed_pixels.packed_pixels tests fail on 32bit Mesa"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104395">bug 104395</a>
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<td>mattst88@gmail.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [CTS] GTF-GL46.gtf32.GL3Tests.packed_pixels.packed_pixels tests fail on 32bit Mesa"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104395#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [CTS] GTF-GL46.gtf32.GL3Tests.packed_pixels.packed_pixels tests fail on 32bit Mesa"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104395">bug 104395</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>This basically boils down to:
_mesa_lroundevenf(0.571428597f * 0xffffffffu)
returning wildly different results on 64-bit and 32-bit.
64-bit: result = 0x92492500
32-bit: result = 0x80000000
This happens even if I use the lrintf path directly instead of the SSE
intrinsics.
----------------------------------
How to arrive at this conclusion:
1. Simplify the test to do less work:
a. Comment out all "formats" other than GL_RED
b. Comment out all "types" other than GL_SHORT and GL_UNSIGNED_INT
3. Break in get_tex_rgba_uncompressed
We should be doing a R16_SNORM -> R32_UNORM conversion here
4. Note the conversion to RGBA32_FLOAT for transfer ops
5. Observe that texgetimage.c:546 _mesa_format_convert has the same float
source data in both 32-bit and 64-bit builds, but produces different R32_UNORM
result data.</pre>
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