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perf: allocation/scan hardening for weaker hardware

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Static-analysis follow-ups to the trace-backed fixes; each is cheap
insurance on machines where the profiled headroom doesn't exist.

- highway.js: _makeBundle now mutates one persistent per-instance
  object instead of allocating a fresh ~35-field bundle every rAF
  frame (xN under splitscreen). Object identity is stable and
  meaningless; array fields still swap reference on chart changes,
  which field-identity caches rely on. Contract documented in both
  CLAUDE.mds.
- highway.js: new bsearchTime (lower-bound on .time) windows the
  default 2D renderer's beat-line scan (was O(all beats) per frame);
  bundle.lowerBoundT / bundle.lowerBoundTime expose the searches to
  custom viz so they stop reimplementing visible-window culling.
- highway_3d: localStorage 'h3d_full_sus' polled at ~1 Hz instead of
  every frame (synchronous storage read on the hot path).
- highway_3d: drawLyrics caches the measureText row layout keyed on
  (lyrics ref, line index, shown count, font size, width) — per-frame
  work is now just drawing over cached widths.
- tests/js: bundle source-shape assertions widened to accept the
  assignment form ([:=]) alongside the old object-literal form.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
OmikronApex
2026-07-02 00:02:54 +02:00
co-authored by Claude Fable 5
parent 5239665e2b
commit 77547af110
10 changed files with 208 additions and 128 deletions
Download Patch File Download Diff File Expand all files Collapse all files
plugins/highway_3d/screen.js
+56 -30
View File
@@ -4677,10 +4677,12 @@
// the full look (re-enable the rail bloom) per browser, no rebuild:
// localStorage.h3d_full_sus = '1' // re-enable rail bloom halo
// delete localStorage.h3d_full_sus // back to lean default
// Read once per frame at the top of update() so the flag takes effect
// live. The bloom pool/material/gaussian texture are kept intact
// Polled at ~1 Hz at the top of update() (perf: localStorage reads
// are synchronous) so the console flag still takes effect live.
// The bloom pool/material/gaussian texture are kept intact
// (still pinned by the bloom unit tests and used by the opt-out path).
let _leanSus = true;
let _leanSusPollCounter = 0;
// Lifecycle flags
let _isReady = false;
@@ -6250,6 +6252,12 @@
return boxH;
}
// Lyrics layout cache — measureText per syllable + row wrapping
// only changes when the displayed line(s), font size, or canvas
// width change, not per frame. Keyed below; the per-frame work is
// just drawing over the cached widths.
let _lyrRowsCache = null;
function drawLyrics(lyrics, currentTime, ctx, W, H) {
if (!lyrics._lines) {
const lines = [];
@@ -6297,37 +6305,51 @@
const sylText = s => { const t = s.w || ''; return (t.endsWith('+') || t.endsWith('-')) ? t.slice(0, -1) : t; };
ctx.font = `bold ${fontSize}px sans-serif`;
const spaceWidth = ctx.measureText(' ').width;
const maxWidth = W * 0.8;
let rows, spaceWidth, bgWidth;
const _lc = _lyrRowsCache;
if (_lc && _lc.lyricsRef === lyrics && _lc.idx === currentIdx
&& _lc.shown === linesToShow.length
&& _lc.fontSize === fontSize && _lc.W === W) {
rows = _lc.rows; spaceWidth = _lc.spaceWidth; bgWidth = _lc.bgWidth;
} else {
spaceWidth = ctx.measureText(' ').width;
const maxWidth = W * 0.8;
const rows = [];
for (const authoredLine of linesToShow) {
let row = [], rowWidth = 0;
for (const wordSyls of authoredLine.words) {
const parts = [];
let wordWidth = 0;
for (const s of wordSyls) {
const text = sylText(s);
const w = ctx.measureText(text).width;
parts.push({ syl: s, text, width: w });
wordWidth += w;
rows = [];
for (const authoredLine of linesToShow) {
let row = [], rowWidth = 0;
for (const wordSyls of authoredLine.words) {
const parts = [];
let wordWidth = 0;
for (const s of wordSyls) {
const text = sylText(s);
const w = ctx.measureText(text).width;
parts.push({ syl: s, text, width: w });
wordWidth += w;
}
const advance = wordWidth + spaceWidth;
if (row.length > 0 && rowWidth + advance > maxWidth) { rows.push(row); row = []; rowWidth = 0; }
row.push({ parts, advance });
rowWidth += advance;
}
const advance = wordWidth + spaceWidth;
if (row.length > 0 && rowWidth + advance > maxWidth) { rows.push(row); row = []; rowWidth = 0; }
row.push({ parts, advance });
rowWidth += advance;
if (row.length) rows.push(row);
}
if (row.length) rows.push(row);
bgWidth = 0;
for (const row of rows) {
const rw = row.reduce((s, w) => s + w.advance, 0) - spaceWidth;
if (rw > bgWidth) bgWidth = rw;
}
bgWidth = Math.min(bgWidth + 30, W * 0.85);
_lyrRowsCache = {
lyricsRef: lyrics, idx: currentIdx,
shown: linesToShow.length, fontSize, W,
rows, spaceWidth, bgWidth,
};
}
const rowHeight = fontSize + 6;
const totalHeight = rows.length * rowHeight + 10;
let bgWidth = 0;
for (const row of rows) {
const rw = row.reduce((s, w) => s + w.advance, 0) - spaceWidth;
if (rw > bgWidth) bgWidth = rw;
}
bgWidth = Math.min(bgWidth + 30, W * 0.85);
ctx.fillStyle = 'rgba(0,0,0,0.7)';
ctx.beginPath();
@@ -9958,10 +9980,14 @@
// Lean sustain rendering is the default (see declaration above):
// the trail/ribbon outline always draws; only the additive rail
// bloom halo is dropped. The full look (with bloom) is an opt-out.
// Cheap per-frame read so the console flag takes effect live.
try {
_leanSus = localStorage.getItem('h3d_full_sus') !== '1';
} catch (_) { _leanSus = true; }
// localStorage.getItem is a synchronous storage read — polled at
// ~1 Hz instead of every frame; the console flag still takes
// effect live (within a second).
if ((_leanSusPollCounter++ % 60) === 0) {
try {
_leanSus = localStorage.getItem('h3d_full_sus') !== '1';
} catch (_) { _leanSus = true; }
}
// Materialize the text-size multiplier from the user's slider.
// textSize ∈ [0,1]; _textSizeMul ∈ [0.5, 1.5] with 0.5 ↦ 1.0×
// so default behaviour matches what the renderer did pre-slider.