Godot: Parse the packed data of a GridMap

parse-grid-map.js

const data = new Uint32Array([65531, 65528, 0, 65531, 65529, 0, 65531, 65530, 0, 65531, 65531, 0, 65531, 65532, 0, 65531, 65533, 0, 65531, 65534, 0, 65531, 65535, 0, 65531, 0, 0, 65531, 1, 0, 65531, 2, 0, 65531, 3, 0, 65531, 4, 0, 65531, 5, 0, 65531, 6, 0, 65532, 65528, 0, 65532, 65529, 0, 65532, 65530, 0, 65532, 65531, 0, 65532, 65532, 0, 65532, 65533, 0, 65532, 65534, 0, 65532, 65535, 0, 65532, 0, 0, 65532, 1, 0, 65532, 2, 0, 65532, 3, 0, 65532, 4, 0, 65532, 5, 0, 65532, 6, 0, 65533, 65528, 0, 65533, 65529, 0, 65533, 65530, 0, 65533, 65531, 0, 65533, 65532, 0, 65533, 65533, 0, 65533, 65534, 0, 65533, 65535, 0, 65533, 0, 0, 65533, 1, 0, 65533, 2, 0, 65533, 3, 0, 65533, 4, 0, 65533, 5, 0, 65533, 6, 0, 65534, 65528, 0, 65534, 65529, 0, 65534, 65530, 0, 65534, 65531, 0, 65534, 65532, 0, 65534, 65533, 0, 65534, 65534, 0, 65534, 65535, 0, 65534, 0, 0, 65534, 1, 0, 65534, 2, 0, 65534, 3, 0, 65534, 4, 0, 65534, 5, 0, 65534, 6, 0, 65535, 65528, 0, 65535, 65529, 0, 65535, 65530, 0, 65535, 65531, 0, 65535, 65532, 0, 65535, 65533, 0, 65535, 65534, 0, 65535, 65535, 0, 65535, 0, 0, 65535, 1, 0, 65535, 2, 0, 65535, 3, 0, 65535, 4, 0, 65535, 5, 0, 65535, 6, 0, 0, 65528, 0, 0, 65529, 0, 0, 65530, 0, 0, 65531, 0, 0, 65532, 0, 0, 65533, 0, 0, 65534, 0, 0, 65535, 0, 0, 0, 0, 0, 1, 0, 0, 2, 0, 0, 3, 0, 0, 4, 0, 0, 5, 0, 0, 6, 0, 1, 65528, 0, 1, 65529, 0, 1, 65530, 0, 1, 65531, 0, 1, 65532, 0, 1, 65533, 0, 1, 65534, 0, 1, 65535, 0, 1, 0, 0, 1, 1, 0, 1, 2, 0, 1, 3, 0, 1, 4, 0, 1, 5, 0, 1, 6, 0, 2, 65528, 0, 2, 65529, 0, 2, 65530, 0, 2, 65531, 0, 2, 65532, 0, 2, 65533, 0, 2, 65534, 0, 2, 65535, 0, 2, 0, 0, 2, 1, 0, 2, 2, 0, 2, 3, 0, 2, 4, 0, 2, 5, 0, 2, 6, 0, 3, 65528, 0, 3, 65529, 0, 3, 65530, 0, 3, 65531, 0, 3, 65532, 0, 3, 65533, 0, 3, 65534, 0, 3, 65535, 0, 3, 0, 0, 3, 1, 0, 3, 2, 0, 3, 3, 0, 3, 4, 0, 3, 5, 0, 3, 6, 0, 4, 65528, 0, 4, 65529, 0, 4, 65530, 0, 4, 65531, 0, 4, 65532, 0, 4, 65533, 0, 4, 65534, 0, 4, 65535, 0, 4, 0, 0, 4, 1, 0, 4, 2, 0, 4, 3, 0, 4, 4, 0, 4, 5, 0, 4, 6, 0, 5, 65528, 0, 5, 65529, 0, 5, 65530, 0, 5, 65531, 0, 5, 65532, 0, 5, 65533, 0, 5, 65534, 0, 5, 65535, 0, 5, 0, 0, 5, 1, 0, 5, 2, 0, 5, 3, 0, 5, 4, 0, 5, 5, 0, 5, 6, 0, 6, 65528, 0, 6, 65529, 0, 6, 65530, 0, 6, 65531, 0, 6, 65532, 0, 6, 65533, 0, 6, 65534, 0, 6, 65535, 0, 6, 0, 0, 6, 1, 0, 6, 2, 0, 6, 3, 0, 6, 4, 0, 6, 5, 0, 6, 6, 0, 7, 65528, 1441796, 7, 65529, 1441796, 7, 65530, 1441796, 7, 65531, 1441796, 7, 65532, 1441796, 7, 65533, 1441796, 7, 65534, 1441796, 7, 65535, 1441796, 7, 0, 1441796, 7, 1, 1441796, 7, 2, 1441796, 7, 3, 1441796, 7, 4, 1441796, 7, 5, 1441796, 7, 6, 1441796, 65532, 7, 4, 65533, 7, 4, 65534, 7, 4, 65535, 7, 4, 0, 7, 4, 1, 7, 4, 2, 7, 4, 3, 7, 4, 4, 7, 4, 5, 7, 4, 6, 7, 4, 65530, 65528, 1441796, 65530, 65529, 1441796, 65530, 65530, 1441796, 65530, 65531, 1441796, 65530, 65532, 1441796, 65530, 65533, 1441796, 65530, 65534, 1441796, 65530, 65535, 1441796, 65530, 0, 1441796, 65530, 1, 1441796, 65530, 2, 1441796, 65530, 3, 1441796, 65530, 4, 1441796, 65530, 5, 1441796, 65530, 6, 1441796, 65531, 7, 4, 65531, 65527, 4, 65532, 65527, 4, 65533, 65527, 4, 65534, 65527, 4, 65535, 65527, 4, 0, 65527, 4, 1, 65527, 4, 2, 65527, 4, 3, 65527, 4, 4, 65527, 4, 5, 65527, 4, 6, 65527, 4, 7, 7, 1048579, 65530, 7, 3, 7, 65527, 655363, 65530, 65527, 1441795, 131079, 2, 655363, 65543, 5, 655363]);
const dataView = new DataView(data.buffer);

/**
  Parses the Key of a GridView element
  @param {number} idx
  @param {DataView} dataView
*/
function parseKey(idx, dataView) {
  return {
    x: dataView.getInt16(idx, true),
    y: dataView.getInt16(idx + 2, true),
    z: dataView.getInt16(idx + 4, true),
  }
}

/**
  Parses the Key of a GridView element
  @param {number} idx
  @param {DataView} dataView
*/
function parseCell(idx, dataView) {
  const part = dataView.getUint16(idx + 2, true);
  return {
    item: dataView.getUint16(idx, true),
    rot: part & 0x1F,
    layer: part >> 5
  }
}

for(let i=0; i< dataView.byteLength / 12; i+= 1) {

  const key = parseKey(i * 12, dataView);
  const cell = parseCell(i * 12 + 8, dataView);

  console.log({key, cell});
}