feat(devtools): tape v2 sparse touch track#164
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Tapes recorded only buttons + analog, and replay force-dropped touch (`touch = undefined`) — touch interactions were unrecordable and unreplayable, which blocks deterministic testing of any touch UX. Tape v2 adds a sparse `touch: [frameIndex, packed[]][]` track (contacts vary per frame mid-drag, so RLE degenerates; idle frames cost zero bytes). The recorder ring allocates lazily on the first frame that has contacts — every touch-free session (all of PSP) records exactly as before and still exports v:1 byte-identical. Replay now owns all three tracks: a v2 tape drives touches() frame-exact, a v1 tape replays every frame as no-contacts, and live hardware contacts never leak into either. hosts/sim: ScriptEvent gains a level-triggered `touch` track (same convention as hold/analog; [] releases), scriptToMasks expands it to packed words, and touchGlide() emits a per-frame linear glide on the 60 Hz grid so a fling is one line in a scenario. runScenario feeds the third frame arg. tools/tape: record grows --touch "f:id,x,y;f:-" (level-triggered); replay and tree now feed all three expanded tracks — this also fixes the analog track being silently dropped in CLI replays. Tests: sparse export shape, v1 byte-stability, v2 replay determinism + live-leak suppression, expandTapeTouch round-trip, script touch levels, touchGlide grid math. Sim suite stays green. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This was referenced Jul 23, 2026
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Part 3/6 of the touch-input series (stacked on #163).
What
framework/src/devtools.ts): sparsetouch: [frameIndex, packed[]][]track using the__packTouchwire words. Sparse-by-frame beats RLE for drags and costs zero bytes on idle frames.v:1byte-identical to pre-touch tapes.touches()frame-exact, v1 tapes replay as no-contacts, and live hardware contacts are never leaked into a replay (previously guaranteed by force-dropping touch; now guaranteed with the track).hosts/sim/sim.ts):ScriptEvent.touch(level-triggered likehold/analog,[]releases), expansion inscriptToMasks, andtouchGlide(x0,y0,x1,y1,t0,t1)— a one-line per-frame glide on the 60 Hz grid for fling journeys.runScenariofeeds the third frame argument.tools/tape.ts):record --touch "f:id,x,y[+id,x,y];f:-"; replay/tree feed all three expanded tracks — incidentally fixing CLI replays silently dropping the analog track.Tests
6 new devtools cases (sparse export shape, v1 byte-stability, v2 replay + live-leak suppression, round-trip, v1 expansion) + script-expansion/glide cases;
tests/sim.test.tsregression green;tsc --noEmitclean.Unblocks: sim touch journeys for VirtualList/OSK (parts 4–5) and scripted Vita touch goldens (part 6).
🤖 Generated with Claude Code