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do less work when not drawing

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This commit is contained in:
Felix Roos 2023-01-15 23:11:49 +01:00
parent 800989419b
commit 5aa983b45b
5 changed files with 283 additions and 282 deletions
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7
packages/react/src/hooks/useStrudel.mjs
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@ -30,6 +30,7 @@ function useStrudel({
const [pattern, setPattern] = useState();
const [started, setStarted] = useState(false);
const isDirty = code !== activeCode;
const shouldPaint = useCallback((pat) => !!(pat?.context?.onPaint && drawContext), [drawContext]);
// TODO: make sure this hook reruns when scheduler.started changes
const { scheduler, evaluate, start, stop, pause } = useMemo(
@ -93,14 +94,14 @@ function useStrudel({
const drawFirstFrame = useCallback(
(pat) => {
if (drawContext && onDraw) {
if (shouldPaint(pat)) {
const [_, lookahead] = drawTime;
const haps = pat.queryArc(0, lookahead);
// draw at -0.001 to avoid activating haps at 0
onDraw(pat, -0.001, haps, drawTime);
}
},
[drawContext, drawTime, onDraw],
[drawTime, onDraw, shouldPaint],
);
const inited = useRef();
@ -130,7 +131,7 @@ function useStrudel({
usePatternFrame({
pattern,
started: drawContext && started,
started: shouldPaint(pattern) && started,
getTime: () => scheduler.now(),
drawTime,
onDraw,