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/// Each VR service may have some code which needs to run on the main thread, /// for example window creation on MacOS is only supported on the main thread. /// Implementations of this trait will usually be neither `Sync` nor `Send`. pub trait VRMainThreadHeartbeat { /// Run the heartbeat on the main thread. fn heartbeat(&mut self); /// Is the heartbeat expecting to be called every frame? fn heart_racing(&self) -> bool; }