@thi.ng/vectors/buffer.js

Optimized 2d/3d/4d and arbitrary length vector operations, support for memory mapping/layouts

import { SIZEOF, typedArray } from "@thi.ng/api/typedarray";
const mapBuffer = (type, buf, num, size, byteOffset = 0, byteStride = size * SIZEOF[type]) => {
  const res = [];
  for (; num-- > 0; byteOffset += byteStride) {
    res.push(typedArray(type, buf, byteOffset, size));
  }
  return res;
};
const intoBuffer = (type, buf, src, byteOffset, byteStride) => {
  const view = typedArray(type, buf);
  const size = SIZEOF[type];
  byteOffset /= size;
  byteStride /= size;
  for (let x of src) {
    view.set(x, byteOffset);
    byteOffset += byteStride;
  }
};
const mapStridedBuffer = (ctor, buf, num, start, cstride, estride) => {
  const res = [];
  while (num-- > 0) {
    res.push(new ctor(buf, start, cstride));
    start += estride;
  }
  return res;
};
const intoStridedBuffer = (set, buf, src, start, cstride, estride) => {
  for (let v of src) {
    set(buf, v, start, 0, cstride, 1);
    start += estride;
  }
  return buf;
};
export {
  intoBuffer,
  intoStridedBuffer,
  mapBuffer,
  mapStridedBuffer
};