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docs: use math notation for example matrices

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Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10281>
This commit is contained in:
Erik Faye-Lund
2021-04-15 16:23:34 +02:00
committed by Marge Bot
parent 525f7b6a23
commit e6e002fc34
1 changed files with 14 additions and 10 deletions
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24
docs/viewperf.rst
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@@ -130,21 +130,25 @@ This test makes some unusual calls to glRotate. For example:
These unusual values lead to invalid modelview matrices. For example,
the last glRotate command above produces this matrix with Mesa:
::
.. math::
1.08536e+24 2.55321e-23 -0.000160389 0
5.96937e-25 1.08536e+24 103408 0
103408 -0.000160389 1.74755e+09 0
0 0 0 nan
\begin{matrix}
1.08536 \times 10^{24} & 2.55321 \times 10^{-23} & -0.000160389 & 0\\
5.96937 \times 10^{25} & 1.08536 \times 10^{24} & 103408 & 0\\
103408 & -0.000160389 & 1.74755\times 10^{9} & 0\\
0 & 0 & 0 & nan
\end{matrix}
and with NVIDIA's OpenGL:
::
.. math::
1.4013e-45 0 -nan 0
0 1.4013e-45 1.4013e-45 0
1.4013e-45 -nan 1.4013e-45 0
0 0 0 1.4013e-45
\begin{matrix}
1.4013 \times 10^{-45} & 0 & -nan & 0\\
0 & 1.4013 \times 10^{-45} & 1.4013 \times 10^{-45} & 0\\
1.4013 \times 10^{-45} & -nan & 1.4013 \times 10^{-45} & 0\\
0 & 0 & 0 & 1.4013 \times 10^{-45}
\end{matrix}
This causes the object in question to be drawn in a strange orientation
and with a semi-random color (between white and black) since GL_FOG is