lingo3d/lib/systems/utils/deferredRenderSystemWithData.js

Lingo3D is a React/Vue 3d game development framework that ships with a complete visual editor

import { onBeforeRender } from "../../events/onBeforeRender";
import Appendable from "../../display/core/Appendable";
export default (cb) => {
    const queued = new Map();
    const processed = new Map();
    const execute = () => {
        if (processed.size === 0)
            for (const [target, data] of queued)
                processed.set(target, data);
        for (const [target, data] of processed) {
            processed.delete(target);
            if (cb(target, data))
                break;
        }
    };
    let handle;
    const start = () => (handle = onBeforeRender(execute));
    const deleteSystem = (item) => {
        if (!queued.delete(item))
            return;
        processed.delete(item);
        item instanceof Appendable && item.$deleteSystemSet.delete(deleteSystem);
        queued.size === 0 && handle?.cancel();
    };
    return [
        (item, data) => {
            if (queued.has(item)) {
                queued.set(item, data);
                return;
            }
            queued.set(item, data);
            item instanceof Appendable &&
                item.$deleteSystemSet.add(deleteSystem);
            if (queued.size === 1)
                start();
        },
        deleteSystem
    ];
};
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