docs: document another viewperf bug in Maya-03

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Brian Paul 2012-04-13 14:31:16 -06:00
parent f2509df95c
commit 286e50a87d
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@ -152,7 +152,38 @@ If the fallback texture created in _mesa_get_fallback_texture() is
initialized to be full white instead of full black the rendering appears
correct.
However, we have no plans to implement this work-around in Mesa.
</p>
<h2>Maya-03 test 2</h2>
<p>
This test makes some unusual calls to glRotate. For example:
</p>
<pre>
glRotate(50, 50, 50, 1);
glRotate(100, 100, 100, 1);
glRotate(52, 52, 52, 1);
</pre>
<p>
These unusual values lead to invalid modelview matrices.
For example, the last glRotate command above produces this matrix with Mesa:
<pre>
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
</pre>
and with NVIDIA's OpenGL:
<pre>
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
</pre>
<p>
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 enabled.
</p>