@pixi/utils/lib/data/interleaveTypedArrays.mjs

Collection of utilities used by PixiJS

import { getBufferType } from './getBufferType.mjs';

const map = { Float32Array, Uint32Array, Int32Array, Uint8Array };
function interleaveTypedArrays(arrays, sizes) {
  let outSize = 0;
  let stride = 0;
  const views = {};
  for (let i = 0; i < arrays.length; i++) {
    stride += sizes[i];
    outSize += arrays[i].length;
  }
  const buffer = new ArrayBuffer(outSize * 4);
  let out = null;
  let littleOffset = 0;
  for (let i = 0; i < arrays.length; i++) {
    const size = sizes[i];
    const array = arrays[i];
    const type = getBufferType(array);
    if (!views[type]) {
      views[type] = new map[type](buffer);
    }
    out = views[type];
    for (let j = 0; j < array.length; j++) {
      const indexStart = (j / size | 0) * stride + littleOffset;
      const index = j % size;
      out[indexStart + index] = array[j];
    }
    littleOffset += size;
  }
  return new Float32Array(buffer);
}

export { interleaveTypedArrays };
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