@thi.ng/soa/aos.js

SOA & AOS memory mapped structured views with optional & extensible serialization

import { SIZEOF } from "@thi.ng/api/typedarray";
import { align } from "@thi.ng/binary/align";
import { SOA } from "./soa.js";
import { prepareSpec } from "./utils.js";
const aos = (num, specs, buf, byteOffset = 0) => {
  let total = 0;
  let maxSize = 0;
  const offsets = {};
  const soaSpecs = {};
  for (let id in specs) {
    const spec = prepareSpec(specs[id]);
    const tsize = SIZEOF[spec.type];
    maxSize = Math.max(maxSize, tsize);
    total = align(total, tsize);
    offsets[id] = total;
    total += tsize * spec.size;
    soaSpecs[id] = spec;
  }
  total = align(total, maxSize);
  buf = buf || new ArrayBuffer(total * num + byteOffset);
  for (let id in soaSpecs) {
    const spec = soaSpecs[id];
    const tsize = SIZEOF[spec.type];
    spec.stride = total / tsize;
    spec.buf = buf;
    spec.byteOffset = byteOffset + offsets[id];
  }
  return new SOA(num, soaSpecs);
};
export {
  aos
};