Re: [osg-users] [osgPPU] FFT users?
Hi Art, Hi Jason, Ok thanks for your answer, I will try with CUDA so. Cheers, Josselin. This message was sent using IMP, the Internet Messaging Program. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPPU] FFT users?
Art Tevs wrote: Just grab it and put instead of the kernel used in that example your FFT code and it should work. There is just one drawback, when using Cuda within OpenGL, the performance. The memory space of Cuda and OpenGL is not shared, hence it costs you some time to copy a texture into cuda space and copy it then back. However I am not sure if there were new extensions to speed up the copy process. I believe there were some extensions added to support this for OpenCL (clCreateFromGLTexture2D, etc). Chances are if these are supported for OpenCL, they're also there for CUDA (you might need CUDA 3.0 for this, though). Also, possibly look at the NV_copy_image extension. --"J" ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPPU] FFT users?
Hi Josselin, I've used Cuda's FFT library with osgPPU in some of my projects last year. Actually exactly for that purpose I've developed the osgPPU::UnitModule which can run any module as a unit on the input data. There is a CUDA example with osgPPU, showing how to use it. Just grab it and put instead of the kernel used in that example your FFT code and it should work. There is just one drawback, when using Cuda within OpenGL, the performance. The memory space of Cuda and OpenGL is not shared, hence it costs you some time to copy a texture into cuda space and copy it then back. However I am not sure if there were new extensions to speed up the copy process. cheers, art josselin wrote: > Hi, > > I just would like to know if someone already used a fft algorithm with > osgPPU (for image processing), with pixel shaders or CUDA? > > Or maybe could you tell me if it's difficult to use CUDA in osgPPU? > I'm quite experimented with PPU but not with CUDA, and I would like to > know how it could be difficult to use the FFT librairy of CUDA > (http://developer.download.nvidia.com/compute/cuda/2_0/docs/CUFFT_Library_2.0.pdf). > > Thanks in avance, > Josselin. > > > This message was sent using IMP, the Internet Messaging Program. > > ___ > osg-users mailing list > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- > Post generated by Mail2Forum -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=24695#24695 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] [osgPPU] FFT users?
Hi, I just would like to know if someone already used a fft algorithm with osgPPU (for image processing), with pixel shaders or CUDA? Or maybe could you tell me if it's difficult to use CUDA in osgPPU? I'm quite experimented with PPU but not with CUDA, and I would like to know how it could be difficult to use the FFT librairy of CUDA (http://developer.download.nvidia.com/compute/cuda/2_0/docs/CUFFT_Library_2.0.pdf). Thanks in avance, Josselin. This message was sent using IMP, the Internet Messaging Program. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
