Hi, Guy wrote: > Hello, > > First I know my question has nothing to do with OSG, but a lot of OSG > users might come across this subject and any guidance would be most > appreciated. > > The questions I ask regard the nVidia textures memory and how to access it. > > > > 1. I'd like to pass data from nVidia texture memory to other card, on > the PCI-Express bus. Is it possible and how to get Texture memory > address and to map it to PCIE address? Or if there is a possibility to > make the card render to memory address which is already mapped to PCIE > address? > > > > 2. I'd like to run some image processing code on the whole screen (no > matter what applications are running on and what they display). > > For that matter, I need to get the screen "image", run my algorithm and > display the result full screen. > > The problems with that are: > > 2.1 After one frame that *I* draw, the next time I'll get the screen > image it might include changes *I* have done to the data. > > 2.2 Getting the screen data is slow. > > > > So the more complicate way to do it is to make all the applications > running, draw to an off-screen memory buffer, process that buffer and > display it. > > Or "plug-in" image processing code, somewhere on the card, after the > driver drawing call functions and before the data it presented on screen. > > > > My questions are: > > 1. Is it possible to access the display buffer data on the nVidia card > "just before" it is displayed on screen? (plug-in my code) Sorry, I have no idea.
> > 2. Would setting the apps drawing to n'th nVidia virtual desktop to that > trick? And then again, does the nVidia card has address of memory buffer > for each n'th virtual desktop? Not sure about how the data flows, but this sounds a lot like what "compiz" does on Linux. Basically all apps draw to OpenGL textures and the results can be modified before it is displayed. Maybe if you look at how they do it you might get some ideas. > > > > Thanks, > > Guy. > cheers jp > > > > ------------------------------------------------------------------------ > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- This message is subject to the CSIR's copyright terms and conditions, e-mail legal notice, and implemented Open Document Format (ODF) standard. The full disclaimer details can be found at http://www.csir.co.za/disclaimer.html. This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. MailScanner thanks Transtec Computers for their support. _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
