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) 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? Thanks, Guy.
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