ThreadWaitType
public enum ThreadWaitType : Equatable, HashableA type indicating how the current thread should wait for work scheduled on the GPU to complete.
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                  The thread does not wait for the work to complete. Useful when the output of the work is used with the GPU pipeline. DeclarationSwift case none
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                  The thread waits until the work is complete. DeclarationSwift case passive
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                  The thread waits for the work to complete with minimal latency, which may require additional CPU resources. DeclarationSwift case active
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                  The thread waits for the work while trying to prevent the GPU from going into sleep mode. DeclarationSwift case aggressive