Hello,
We recently noticed that copying pixel data from a meta texture to memory is a lot slower on the new iPhones equipped with the A14 Bionic.
We tracked down the guilty function on MTLTexture and found that getBytes(_:bytesPerRow:from:mipmapLevel: runs 8 to 20 times slower than 2 years old iPhones (iPhone XR). To measure how long it takes, we used signposts.
We've created a dummy demo project where we convert a MTLTexture to a CVPixelBuffer in this project: https://github.com/alikaragoz/UsingARenderPipelineToRenderPrimitives
The interesting part is located at this line: https://github.com/alikaragoz/UsingARenderPipelineToRenderPrimitives/blob/41f7f4385a490e889b94ee2c8913ce532a43aacb/Renderer/MetalUtils.swift#L40
Do you guys have an idea about what could be the issue?
ali
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