I see region support in MTLBuffer to MTLTexture upload calls, but I’d like to upload an entire level of same-sized mips in 1 call. Calling these routines once for every image x 2048 layers x every mip is a lot of commands. If I could do this once for each mip size, that seems more efficient, though a longer command for Metal to complete.

I was working on a macOS ObjC++ tool that allocated and then replaced a single MTLTexture, and noted that all of the textures were leaked. This project was built with CMake, and I found out the Xcode defaults ARC to off. ARC has been around long enough that I can't think of many ObjC or Swift projects that would work without it. This default should probably be changed. The workaround for now, is in all CMakeLists.txt files, to set the following:   XCODE_ATTRIBUTE_CLANG_ENABLE_OBJC_ARC YES