Hi Michael,
GMan wrote: > > 1 - render the scene to the framebuffer > Setup a camera with FRAME_BUFFER_OBJECT as rendering target. Then use the texture you have added to the camera as input into your CUDA environment. > > 2 - copy the image to a PBO (pixel buffer object) > 3 - map this PBO so that its memory is accessible from CUDA > I am not sure if osgCompute gives you this possibility on the fly, however in the osgPPU::Unit::DrawCallback::drawImplementation() method, you can find the functions calls to use in osg to map a texture into CUDA space. > > 4 - run CUDA to process the image, writing to memory mapped from a second > PBO > It is up to you what you implement here > > 6 - copy from result PBO to a texture > Again you can find in the same method as above the function calls to do this. > > 7 - display the texture > Render a screen sized quad with the resulting texture. For the mapping step, upto CUDA2.2, I think, mapping of OpenGL texture into CUDA space is not fast. Only the newest drivers and CUDA implementation allows to do some kind of zero copy to efficiently map textures into cuda space. However, you have to take a look into newest cuda to see if it realy works, like I said. Next, I think if you just want to postprocess textures it would be easier for you to take a look into osgPPU. It can do exactly the things you want to do manually. Even more the newest osgppu version has CUDA support, so you can process the textures in CUDA and not only in GLSL. Take a look into CUDA examples of osgPPU. osgCompute is a good library to do general computations inside of OSG's scene graph. So for example you want to process vertices or maybe do some simulation, then this is where you require osgCompute. I am not sure how well osgCompute provides you with support for simple texture processing. I guess, you can use it for this kind of computations, however it could be that you have to take care of specifying inputs, outputs, and render the results. However, it would be nice to hear from the authors of osgCompute how to solve your needs with this library. cheers, art ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=17663#17663 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
