Serialize admitted device-native work against device destruction.

Retain resource as a dependency of encoder's eventual command buffer.

Allocate and begin one general Metal 4 command buffer.

End recording and transfer native memory and dependencies to one-shot work.

Publish encoder's ended native ownership as one command-buffer wrapper.

Enqueue queue's newest ready shared-event signal, retaining it on failure.

Whether queue owns no signal, submitted, or native-retirement obligation.

Unroot queue only after backend quiescence was proved under its lock.

Retire completed submissions and every now-eligible native ownership.

Service queue from the process custodian registry without caller access.

Transfer one native owner after revalidating its queue under the lock.

Transfer resource's native ownership before logically invalidating it.

Wait for the Metal 4 shared-event frontier most recently submitted.

Commit finished Metal work and retain its dependencies to queue's frontier.

after-commit performs the drawable signal and presentation handshake before the completion event is enqueued. Presentation is the only caller of that backend-local extension; ordinary callers use submit. #T9K4RC

Return a persistent completion-and-ledger barrier for device destruction.

Return device's persistent one-native-call-at-a-time teardown.

Create one shared Metal buffer and add its allocation to device residency.

Copy a one-dimensional numeric array into shared Metal memory.

data holds single-floats or unsigned 8-, 16-, 32-, or 64-bit integers; offset is aligned to the element size.

Create one resident two-dimensional Metal texture.

Translate a MetalFX texture usage mask into the portable usage vocabulary.