Add TransferBuffer and AsyncRead support to Metal.
* Implements onTransferPixelsFrom, onTransferPixelsTo, onFinishFlush and
checkFinishProcs.
* Adds a bind() method for allocating dynamic buffer memory that can
be used by the GPU prior to mapping on the CPU
Bug: skia:8243
Change-Id: I366ec47bf1155797d9a9b0c9f33870e50c95e914
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/244301
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
6 files changed