DXVA2 Native vs DXVA2 Copy-back

dadin...@gmail.com

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Mar 28, 2016, 4:11:28 PM3/28/16

to Graphics-dev

hi

when it comes to hardware accelerated html5 avc does google chrome use dxva2 native or dxva2 copy-back ?

or is both possible ? if so is there a way to influence that behaviour ?

thanks

dadin...@gmail.com

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Apr 8, 2016, 8:04:48 AM4/8/16

to Graphics-dev, dadin...@gmail.com

hi

how can it be possible that no one knows that ?

thx

Dale Curtis

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Apr 8, 2016, 1:37:57 PM4/8/16

to dadin...@gmail.com, Graphics-dev, ana...@chromium.org, John Bauman

We use the MFT on supported platforms and DXVA on older ones. The behavior in older cases is a copy-back style approach, but jbauman@ has recently added code to avoid these copies in some cases.

- dale

dadin...@gmail.com

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Apr 8, 2016, 2:40:22 PM4/8/16

to Graphics-dev, dadin...@gmail.com, ana...@chromium.org, jba...@chromium.org

Thanks very much !

Does any kind of a copy-back take place if MFT is being used ?

John Bauman

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Apr 8, 2016, 4:09:32 PM4/8/16

to dadin...@gmail.com, Graphics-dev, ana...@chromium.org

No, the data essentially always stays on the GPU if we're using the MFT.

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