sequenceDiagram
  participant G as Game
  participant S as Latency semaphore
  participant D as dxgi Present
  participant T as dxgi latency thread
  participant M as Metal queue
  G->>S: wait (count 1 -> 0)
  G->>D: Present(frame 7)
  D->>M: commit present, then signal event = 7
  D->>T: queue frame 7
  Note over G,D: before: Present released the semaphore<br/>here, so the game never waited
  G->>S: wait (blocks)
  T->>M: wait until event >= 7
  M-->>T: frame 7 finished on the GPU
  T->>S: release (count 0 -> 1)
  S-->>G: wait returns, start frame 8