@woosh/meep-engine/src/core/binary/split_by_3.js

Pure JavaScript game engine. Fully featured and production ready.

/**
 * method to separate bits from a given integer 3 positions apart
 * we only look at the first 10 bits
 *
 * @example when input is ABC, output bits are 00A00B00C
 * @param {number} a
 * @returns {number}
 */
export function split_by_3(a) {
    let x = a;
    x = (x | x << 16) & 0x30000ff;
    x = (x | x << 8) & 0x0300f00f;
    x = (x | x << 4) & 0x30c30c3;
    x = (x | x << 2) & 0x9249249;
    return x;
}