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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [llvmpipe] piglit gl-1.4-polygon-offset regression"
href="https://bugs.freedesktop.org/show_bug.cgi?id=71199#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [llvmpipe] piglit gl-1.4-polygon-offset regression"
href="https://bugs.freedesktop.org/show_bug.cgi?id=71199">bug 71199</a>
from <span class="vcard"><a class="email" href="mailto:sroland@vmware.com" title="Roland Scheidegger <sroland@vmware.com>"> <span class="fn">Roland Scheidegger</span></a>
</span></b>
<pre>(In reply to José Fonseca from <a href="show_bug.cgi?id=71199#c4">comment #4</a>)
<span class="quote">> This test was renamed, but the issue is still there:
>
> $ ./bin/gl-1.4-polygon-offset -auto
> Actual MRD is too small (may cause incorrect results)
> Ideal MRD at near plane is 1.192095e-07 (nominally 2 bits)
> Actual MRD at near plane is 5.960464e-08 (nominally 1 bit)
> Ideal MRD at infinity is 3.061179e-08 (nominally 1 bit)
> Actual MRD at infinity is 5.960464e-08 (nominally 1 bit)
> </span >
<span class="quote">> Yes, they do somehow:
>
> $ glxinfo | grep '^OpenGL \(vendor\|renderer\) string:'
> OpenGL vendor string: NVIDIA Corporation
> OpenGL renderer string: Quadro K1000M/PCIe/SSE2
> $ ./bin/gl-1.4-polygon-offset -auto
> Ideal MRD at near plane is 1.192089e-07 (nominally 2 bits)
> Actual MRD at near plane is 1.192093e-07 (nominally 2 bits)
> Ideal MRD at infinity is 1.499423e-08 (nominally 0 bits)
> Actual MRD at infinity is 1.192093e-07 (nominally 2 bits)
>
> PIGLIT: {"result": "pass" }</span >
Interestingly even the ideal MRD is different, suggesting differences in basic
vertex transform math, or different rounding when converting to unorm z?
This test is too weird for me...</pre>
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