https://developer.apple.com/documentation/metal/heaps/image_filter_graph_with_heaps_and_fences?language=objc
https://developer.apple.com/documentation/metal/reducing_the_memory_footprint_of_metal_apps?language=objc
https://developer.apple.com/documentation/metal/setting_resource_storage_modes/choosing_a_resource_storage_mode_in_ios_and_tvos?language=objc
https://developer.apple.com/documentation/metal/setting_resource_storage_modes?language=objc
https://developer.apple.com/documentation/metal/synchronization?language=objc
metal docs--Synchronization&memory management
原文：https://www.cnblogs.com/minggoddess/p/11093091.html