Hi! There are 2 scenarios of to implement GPU-based compositing. In the early days you did this via OpenGL and the final picture was influenced a lot on the specific hardware you ran it on (What OpenGL feature is implemented and how). Nowadays this is still an issue with OpenGL, but the cracks are smaller. The second scenario is to use something like Cuda, Steam or OpenCL. These are compute libraries and will ensure that all calculations are done in the same manner among devices. Also universities and other parties in our industry use it for this. Farms are already being migrated to OpenCL farms. As they are cheaper in hardware costs.
BTW. renderfarm.fi should be capable of running OpenCL as this is proposal is implemented! OpenCL has some limitations. We testdrive the approach by only using OpenCL for these nodes. But due to graphical memory boundaries it was only possible to use resolutions up to 4k on a 1Gb card and the code that needed to be done is not easilly maintainble. The OpenCL code was visible in the node itself and IMO you shouldn't need a core blender developer to create a node. In the future I see that we will get multiscoptic video and higher resolutions and complexer nodes (an accurate 3d blur in stead of the vector blur) and node systems (framenumber based switch: calculate this via vector blur in the begin of the scene and calculate this via 3d blur later in the scene). To solve these limitation you need something as tile based compositing and a memory manager for OpenCL and the node internals should be restructures. Without these you will not be able to get a production stable OpenCL. The Compositor has technical 3 parts. The nodes editor, the nodes themselves and the Execution engine. The tiled based node system influences the execution engine for 90%, the nodes needs to be restructured internally, and the nodes editor should only be influenced for a tiny part. As a result of this proposal the redesign of the compositor editor and implementing other nodes will become much easier. Also the OpenCL components can be used to add OpenCL to other area's in Blender (like the renderer or simulations). Jeroen On 01/15/2011 01:02 AM, Mike Pan wrote: > > From a user's perspective, it seems a few node (blur, defocus, vector blur) > is responsible for over 90% of the node-compositing time in a real > production, accelerating these will probably have a far larger impact/effort > ratio than overhauling the entire framework. > > also, sorry about the LinkedIn spam earlier today. > > -mike pan > > > On Fri, Jan 14, 2011 at 11:27 AM, Roger Wickes From IPhone< > [email protected]> wrote: > >> And next gen cpus are incorporating the arch from what i read >> >> Sent from my iPhone >> >> On Jan 14, 2011, at 8:17 AM, Xavier Thomas<[email protected]> >> wrote: >> >>> Beside, OpenCL does not specially mean GPU. OpenCL can be executed by CPU >>> and even be accelerated by multiple CPU/Cores >>> >>> 2011/1/14 Knapp<[email protected]> >>> >>>>> While some of the GPU based stuff nowadays looks very spectacular, I >>>>> personally still feel hesitant - I don't think CPUs (and especially >>>>> multiprocessing) should be left by the wayside. Not only due to the >>>>> increasing prevalence of multicore systems nowadays, but also for >>>>> render farms, which are very largely CPU based. >>>>> >>>>> cheers >>>>> >>>>> Matt >>>> Yes, but for how long will that remain true?? >>>> >> http://www.tomshardware.com/news/nvda-china-super-computer-gpu,11545.html >>>> Douglas E Knapp >>>> >>>> Creative Commons Film Group, Helping people make open source movies >>>> with open source software! >>>> http://douglas.bespin.org/CommonsFilmGroup/phpBB3/index.php >>>> >>>> Massage in Gelsenkirchen-Buer: >>>> http://douglas.bespin.org/tcm/ztab1.htm >>>> Please link to me and trade links with me! >>>> >>>> Open Source Sci-Fi mmoRPG Game project. >>>> http://sf-journey-creations.wikispot.org/Front_Page >>>> http://code.google.com/p/perspectiveproject/ >>>> _______________________________________________ >>>> Bf-committers mailing list >>>> [email protected] >>>> http://lists.blender.org/mailman/listinfo/bf-committers >>>> >>> _______________________________________________ >>> Bf-committers mailing list >>> [email protected] >>> http://lists.blender.org/mailman/listinfo/bf-committers >> _______________________________________________ >> Bf-committers mailing list >> [email protected] >> http://lists.blender.org/mailman/listinfo/bf-committers >> > _______________________________________________ > Bf-committers mailing list > [email protected] > http://lists.blender.org/mailman/listinfo/bf-committers > -- Met vriendelijke groet, Jeroen Bakker *At Mind BV * Telefoon: 06 50 611 262 E-mail: [email protected] <mailto:[email protected]> _______________________________________________ Bf-committers mailing list [email protected] http://lists.blender.org/mailman/listinfo/bf-committers
