Hi Brad, This is the type of thing that I'd need to test directly the type of thing your are myself to grok what is going on so really can't add anything w.r.t specifics on what is going on at your end.
What I do know is that the OSG will be incrementing frame numbers sequentially, if it wasn't we'd be having lots of problems in lots of other places in the OSG. In the case of DrawThreadPerContext there are two SceneView and associated rendering backend data structures per context to handle the parallel cull and draw traversals that this threading model supports. I don't know if this has any baring on what's happening at your end. Robert. On Thu, Mar 3, 2011 at 6:19 PM, Brad Colbert <bcolb...@rscusa.com> wrote: > Robert, > > Touching back on this thread: I guess my question is if frame number > skipping is the designed behavior? If so, then I'll just have to figure out > a way to deal with it, if it is not, then I can dig in a little deeper to > figure out why it's skipping. Any suggestions will help. > > -B > > > -----Original Message----- > From: osg-users-boun...@lists.openscenegraph.org > [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Brad Colbert > Sent: Thursday, February 03, 2011 10:27 AM > To: 'OpenSceneGraph Users' > Subject: Re: [osg-users] Why does Draw skip frame number as reported from > FrameStamp::getFrameNumber()? > > One more update: > > I modified the code slightly in both the Pre and Post draw callbacks to > compare frame numbers. I would expect that they would have the same number, > but they do not at times. > > I also added a bit of code to the PostDraw to compare the last frame number > to the current. The results are not what I would expect. > > Again, this is DrawThreadPerContext. > > Output snipet: > > Pre 0x7fffe5f49f90 : 1501 > Pos 0x7fffe66f6ea0 : 1501 > > Pre 0x7fffe5f49f90 : 1502 > Pos 0x7fffe66f6ea0 : 1503 ** Not Next ** previous frame was 1501 > > Pre 0x7fffe5f49f90 : 1503 > Pos 0x7fffe66f6ea0 : 1503 ** Not Next ** previous frame was 1503 > > Pre 0x7fffe5f49f90 : 1504 > Pos 0x7fffe66f6ea0 : 1504 > > Pre 0x7fffe5f49f90 : 1505 > Pos 0x7fffe66f6ea0 : 1506 ** Not Next ** previous frame was 1504 > > -B > > > -----Original Message----- > From: osg-users-boun...@lists.openscenegraph.org > [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Brad Colbert > Sent: Thursday, February 03, 2011 10:11 AM > To: 'OpenSceneGraph Users' > Subject: Re: [osg-users] Why does Draw skip frame number as reported from > FrameStamp::getFrameNumber()? > > Simplifying my example, my PostDrawCallback now simply prints the pointer > value of *this (to determine that it's the same PostDrawCallback instance) > and the frame number and I get the following (snipet): > > 0x2a9a400:896 > 0x2a9a400:896 > 0x2a9a400:898 > 0x2a9a400:899 > 0x2a9a400:899 > 0x2a9a400:901 > 0x2a9a400:902 > 0x2a9a400:902 > 0x2a9a400:904 > > Clearly it's the same callback, there is only one camera, and the frame > number is repeating and skipping. > > -B > > > -----Original Message----- > From: osg-users-boun...@lists.openscenegraph.org > [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Robert > Osfield > Sent: Thursday, February 03, 2011 9:14 AM > To: OpenSceneGraph Users > Subject: Re: [osg-users] Why does Draw skip frame number as reported from > FrameStamp::getFrameNumber()? > > Hi Brad, > > I couldn't make sense of your original email and same with this one, > I'm confused by the role of your map and would suspect that your > method is the cause of the odd output. > > The way I'd check the current frame number is to simply have a draw > callback directly output the frame number. > > Robert. > > On Thu, Feb 3, 2011 at 5:07 PM, Brad Colbert <bcolb...@rscusa.com> wrote: >> I'm resending this with a new Subject: line. Worried that it was a little >> too cryptic. >> >> I'm trying to understand how the threading works in OSG when >> DrawThreadPerContext with respect to which process is on which frame at >> which time. It appears to me that the draw frame is skipping values in the >> frame count, as reported from FrameStamp::getFrameNumber(). >> >> My test code fills a map<int,bool> (the int is the frame time, and bool is >> just there ;) ) in a cull traversal by using the following code: >> >> // >> const osg::FrameStamp* frameStamp = cv->getFrameStamp(); >> >> frameMap[frameStamp->getFrameNumber()] = true; >> >> >> // >> And in a PostDrawCallback on a camera I'm printing out the current frame # : >> the frames #'s in the map, and then I clear the current frame number entry: >> >> // Get the current frame number >> osg::FrameStamp* frameStamp = renderInfo.getState()->getFrameStamp(); >> >> int frameNumber = frameStamp->getFrameNumber(); >> >> std::cout << frameNumber << " : "; >> >> std::map<int, bool>::const_iterator framei = frameMap.begin(); >> >> for (; framei != frameMap.end(); framei++ ) >> std::cout << framei->first << ", "; >> >> std::cout << "\n\n"; >> >> frameMap.erase( frameNumber ); >> >> >> The following is the output on the console. Again, the first number is the >> current frame number in the PostDrawCallback of the camera. The following >> numbers, on the same line, are the frame numbers placed in the map during >> the cull traversal. >> >> >> 746 : >> >> 747 : >> >> 749 : 748, 749, >> >> 750 : 748, 750, >> >> 751 : 748, 751, >> >> 752 : 748, 752, >> >> 753 : 748, 753, >> >> 754 : 748, >> >> 755 : 748, 755, >> >> 756 : 748, >> >> 757 : 748, 756, 757, >> >> 758 : 748, 756, 758, >> >> 759 : 748, 756, 759, >> >> 759 : 748, 756, >> >> 761 : 748, 756, 760, 761, >> >> >> My question is, why is the draw skipping frame numbers? >> >> --- >> Brad Colbert >> Renaissance Sciences Corporation >> >> _______________________________________________ >> osg-users mailing list >> osg-users@lists.openscenegraph.org >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
