[Mesa-dev] [Bug 71199] [llvmpipe] piglit gl-1.4-polygon-offset regression

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71199

--- Comment #5 from Roland Scheidegger <sroland at vmware.com> ---
(In reply to José Fonseca from comment #4)
> 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)
> 

> 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" }

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...

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