On Jun 26, 2007, at 10:27 AM, Brian wrote:
I think that I am running into a texture memory issue, but I would
like to verify if that is the case or not. Is there a way built
into OSG (still using 1.2) to query this information?
hi brian,
the real trick isn't whether or not osg can tell you, but whether the
graphics driver will. you can go through and measure the overall
texture data in-use in an osg scene, and even, through clever cull-
callbacks, in-frame. however, this will only tell you how much raw
memory is potentially required for the textures. what you don't learn
is how those textures are actually paged in/out by the graphics
hardware, and how much graphics memory is really available to use as
texture memory on the card in the first place.
so to tell if you're running into a texture bottleneck in particular,
you've got to do some profiling, and watch how much time is spent in
texture downloads, per-frame. this can be aided with tools like those
from nvidia:
http://developer.nvidia.com/object/nvperfhud_home.html
and there are also some great tools on the mac as well, specifically
DriverMonitor.
bob
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