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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | 1x 6x 6x 6x 6x 1x 5x 4x 4x 2x 2x 2x 5x 5x 5x | import { RefObject, useEffect } from 'react';
import { useApp } from '@playcanvas/react/hooks';
import { Script, XRTYPE_VR } from 'playcanvas';
/**
* Replays a one-shot script effect at the start of every VR session.
*
* `GSplatShaderEffect` zeroes its timeline on the script's `enable` event and switches itself off
* once the animation has played out, so re-enabling a finished effect runs it again. The `enabled`
* setter only fires the event on a change of state, which is why an effect still mid-play is taken
* back through disabled first.
*
* @param scriptRef - The script instance to replay, as handed back by `Script`'s ref.
* @param enabled - Whether the effect is in use at all. No session is watched while false.
*/
export const useRestartOnVr = (scriptRef: RefObject<Script | null>, enabled: boolean) => {
const app = useApp();
useEffect(() => {
const xr = app?.xr;
if (!xr || !enabled) {
return;
}
const restart = () => {
const script = scriptRef.current;
if (!script || xr.type !== XRTYPE_VR) {
return;
}
script.enabled = false;
script.enabled = true;
};
xr.on('start', restart);
return () => {
xr.off('start', restart);
};
}, [app, enabled, scriptRef]);
};
export default useRestartOnVr;
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