mdx-m3-viewer/src/common/convertbitrange.ts

A browser WebGL model viewer. Mainly focused on models of the games Warcraft 3 and Starcraft 2.

/**
 * Returns a number, which when multiplied with a number of fromBits bits, will convert it to a toBits bits number.
 * 
 * For example, 7 * convertBitRange(3, 8) == 255.
 * 
 * In other words, if we look at the bits, 111 is the same to 3 bits as 11111111 is to 8 bits.
 */
export default function convertBitRange(fromBits: number, toBits: number) {
  return ((1 << toBits) - 1) / ((1 << fromBits) - 1);
}