A native destination with a lifetime and frame clock.

Test whether two compatible scalars are equal.

Return the native lifecycle state of CANVAS.

Return true when the caller is CANVAS's native event/frame thread.

Logical conjunction of tests and raw truth values.

Run FUNCTION with a timestamp on CANVAS's native frame/event thread. The initial native implementation is synchronous: the caller waits for the function's values. The protocol leaves room for a real frame scheduler.

Return INSTRUMENT's input and visual stacking priority.

Publish INSTRUMENT's already-owned state at VIEWER's frame boundary.

Encode INSTRUMENT into VIEWER's final PASS at PHYSICAL-EXTENT.

Handle EVENT for INSTRUMENT and return true when world input must stop.

Release INSTRUMENT while VIEWER's GPU device is live.

Return VIEWER's live mutation owner, or NIL before native startup.

Attach INSTRUMENT at VIEWER's frame boundary in explicit priority order. ADD consumes a newly offered INSTRUMENT on both success and terminal rejection. Once VIEWER begins stopping, the rejected instrument is released exactly once before APPLICATION-ATTACHMENT-CLOSED is signalled.

Run FUNCTION as CONTROLLER's sole teardown, or observe its published result. A concurrent caller waits while the owner runs. A later caller receives the same values or signals the same condition without running FUNCTION again.

Detach and release INSTRUMENT at a frame boundary. Return true when it was attached. Release is synchronous with the caller and therefore cannot overlap a native frame which still borrows the instrument.

Named release failures reported without replacing an active transfer.

An application attachment was offered after terminal teardown began.

Logical disjunction of tests and raw truth values.

Prepare COMPOSITOR for immutable MIRROR REVISION outside a render pass.

A direct GPU target for an ordered LUV-GPU-MEDIUM drawing stream. An embedded mirror retains an immutable prepared CPU revision for the game's final pass; a standalone mirror renders into its native canvas drawable.

Publish frame-boundary instruments, then borrow VIEWER's renderer. An instrument operation may transactionally replace the complete renderer cohort and retire the previous one. No frame may borrow that previous cohort before the operation boundary, or it would encode through resources which the same canvas thread…

Logical negation of one test or raw truth value.

Return cached M-x entries read from TABLES. Each command appears once even when command-table inheritance exposes it in several layers. OWNER-FRAME, when supplied, excludes commands which that application currently disables. Commands with required arguments remain out until M-x has an argument-prompting interaction…

Return the command tables whose executable vocabulary M-x shows. The default is OWNER-FRAME's complete table. Applications may either pass an explicit list to MAKE-EMBEDDED-COMMAND-MENU or specialize this protocol when their semantic layers should remain separately inspectable.