[osg-submissions] Enhanced statistics

[Karl Heijdenberg]

Hi all,

I have done some work in our OSG project to be able to display more
and better statistics. The changes that I have done is compatible with
the latest svn version (2007-11-16) and version 2.2.0. I hope this
work can be of interest for the community and if it is considered good
enough it would be great to have it added permanently to the
OpenSceneGraph.

To use the statistics, replace the original source files with the
files in the attached osg_stats.tgz archive:

I have taken some example screen shots of the statistics.

In example1.jpg I use osgviewer to display two osg example models.

The upper part of the statistics shows a continuously updated graph
which displays the load over the last 240 frames. As you can see a
couple of frames ago there was some extra load to the graphics. This
was due to the wireframe mode that was active to during that time.

Below the load graph you can see the event and update stats for the
eight latest frames (hard to see since its almost no work done there).
Last frame is drawn furthest to the left side and the eighth last
frame furthest to the right.

The outlined box below the event and update stats shows statistics for
the one and only camera used for the osgviewer. The name of the camera
would have been written next to 'Camera:' if it had been set to the
object (see example2.jpg). The light blue statistics displays the
number of vertices, drawables, lights and bins after the cull process
for the camera. It also displays the number of GL primitives of each
present type. Since there only are TRIANLGE_STRIPS in the view of
example1.jpg thats the only information displayed. See example2.jpg
and example3.jpg for statistics with more GL primitives.

Below the camera statistics there are statistics presented for the
whole scene (in the purple outlined box) within a view. If there had
been more than one view the scene stats for the next view would have
been presented to the right of the first one. The same thing applies
to the name of the view (as for the camera) which would have been
displayed after the 'Scene stats for view ' text if it had been set to
the view object.

In example2.jpg there is one master camera for the right half of the
image and a slave camera for the left half of the image. Each camera
has its own statistics box. (example2.jpg uses a composite viewer to
set up the cameras).

No total scene stats are shown in the example2.jpg since 's' only has
been pressed two times not three.

The viewer will loop these display modes when you press 's' in your viewer:

1) Frame rate stats is displayed.
2) 1 + Viewer stats is displayed.
3) 1 + 2 + Scene stats is displayed.
4  All stats will be removed.

example3.jpg is an example of a scene from our graphics engine
developed at Saab Aerosystems.

One thing that I think have to be rethought is the allocation of
attributeMapList elements in osg/Stats class where I changed the
allocation from 25 to 240 attributeMapList elements which is not good
from a memory perspective. I had to do this though to be able to store
frameTime for enough frames in the past for the load graph. There is
probably a more efficient way to index frames back in time than with
this memory expensive structure. It is also slow to look up values
from. A ring buffer could eventually be used instead.

Regards Karl
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