Cycling 74 » Topic: background elimination / substraction in open gl http://cycling74.com/forums/topic/background-elimination-substraction-in-open-gl/feed Wed, 19 Jun 2013 23:09:31 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/background-elimination-substraction-in-open-gl/#post-57469 <![CDATA[background elimination / substraction in open gl]]> http://cycling74.com/forums/topic/background-elimination-substraction-in-open-gl/#post-57469 Mon, 06 Jun 2011 09:47:59 +0000 ćwiek hi!
i started to work on video tracking, and i would like to free my cpu, during background substraction. i'v made a simple patch in opengl, but something is still eating my whole 1 core, of Phenom II X6. i thought, that it will be done in gpu, but it isn't. can you help me with optimization?

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]]> http://cycling74.com/forums/topic/background-elimination-substraction-in-open-gl/#post-205904 <![CDATA[Re: background elimination / substraction in open gl]]> http://cycling74.com/forums/topic/background-elimination-substraction-in-open-gl/#post-205904 Mon, 06 Jun 2011 15:50:11 +0000 Rob Ramirez more than likely, it’s all those matrix-readbacks. every time you send a blue patchcord into a jit.matrix, the CPU is tasked with doing a readback from the GPU. get rid of those and see if your cpu utilization goes down (or FPS goes up)

]]> http://cycling74.com/forums/topic/background-elimination-substraction-in-open-gl/#post-205905 <![CDATA[Re: background elimination / substraction in open gl]]> http://cycling74.com/forums/topic/background-elimination-substraction-in-open-gl/#post-205905 Mon, 06 Jun 2011 15:59:09 +0000 cap10subtext This would be my first step to optimize: always cheaper to do grab as uyvy when possible and get rid of all those preview windows.

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]]> http://cycling74.com/forums/topic/background-elimination-substraction-in-open-gl/#post-205906 <![CDATA[Re: background elimination / substraction in open gl]]> http://cycling74.com/forums/topic/background-elimination-substraction-in-open-gl/#post-205906 Fri, 17 Jun 2011 13:52:05 +0000 ćwiek megathanks!you saved my live second time :)

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