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1a144edf
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2022-04-13T17:15:29
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Metal:ReadPixels AMD Copy Texture to Buffer optimization
On AMD GPUs it's faster to copy a texture to a buffer
for read back than to read via a texture.
For reading from a normal texture 24-27ms -> 6-9ms
For reading from a IOSurface texture 17-20ms -> 7-10ms
Bug: angleproject:7117
Change-Id: I7c7f276a3121e87f5c52a1a4287d13203a6b1b37
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3584423
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kyle Piddington <kpiddington@apple.com>
Commit-Queue: Gregg Tavares <gman@chromium.org>
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