Mesa (master): docs: document another viewperf bug in Maya-03

[Brian Paul]

Module: Mesa
Branch: master
Commit: 286e50a87d6dc2cd9e6d020a6d41eb7cdc506c9d
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=286e50a87d6dc2cd9e6d020a6d41eb7cdc506c9d

Author: Brian Paul <brianp at vmware.com>
Date:   Fri Apr 13 14:31:16 2012 -0600

docs: document another viewperf bug in Maya-03

---

 docs/viewperf.html |   31 +++++++++++++++++++++++++++++++
 1 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/docs/viewperf.html b/docs/viewperf.html
index c294255..1005eae 100644
--- a/docs/viewperf.html
+++ b/docs/viewperf.html
@@ -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>