Hi Michael, in osgCompute it is very easy to set up this example. Ok let's go through all the steps you have to do:
GMan wrote: > 1 - render the scene to the framebuffer Like Art already said you have to render the scene with a camera. Before that you need to attach a osgCuda::Texture2D to it which is nothing more than an extended osg::Texture2D. (If you are not familiar with that stuff you can take a look at the osgprerender example of OSG.) GMan wrote: > > 2 - copy the image to a PBO (pixel buffer object) > 3 - map this PBO so that its memory is accessible from CUDA This is already provided by osgCuda::Textures. You have to call the map()-function available for all osgCompute::Buffers (osgCuda::Texture2D is a osgCompute::Buffer as well). The map function returns a pointer to the GPU memory and hides the memory copy as well as the mapping for you. For all types of buffers (e.g. osgCuda::Geometry) this is exactly the function to call in order to receive a pointer to the device or host memory. This requires an internal memory copy on the GPU and cannot be removed by a zero copy function since you want to map texture memory on the GPU. GMan wrote: > > 4 - run CUDA to process the image, writing to memory mapped from a second PBO > Now you have to call your own kernel module. You can also look at our osgTexDemo example. GMan wrote: > > 6 - copy from result PBO to a texture > 7 - display the texture > You need to specify an output osgCuda::Texture2D (You can use the same texture as for your camera if your algorithm allows this). However, to render the result back to your screen you render a screen sized quad with this texture attached. For this step see also our osgTexDemo example. I hope this answers your question. Best regards, Jens -- SVT Group ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=17680#17680 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
