@slippi/slippi-js/dist/utils/rollbackCounter.esm.js

Official Project Slippi Javascript SDK

class RollbackCounter {
  constructor() {
    this.rollbackFrames = {};
    this.rollbackFrameCount = 0;
    this.rollbackPlayerIdx = null;
    // for keeping track of rollbacks by following a single player
    this.lastFrameWasRollback = false;
    this.currentRollbackLength = 0;
    this.rollbackLengths = [];
  }
  checkIfRollbackFrame(currentFrame, playerIdx) {
    if (this.rollbackPlayerIdx === null) {
      // we only want to follow a single player to avoid double counting. So we use whoever is on first.
      this.rollbackPlayerIdx = playerIdx;
    } else if (this.rollbackPlayerIdx !== playerIdx) {
      return;
    }
    if (currentFrame && currentFrame.players) {
      // frame already exists for currentFrameNumber so we must be rolling back
      // Note: We detect during PreFrameUpdate, but new versions have a
      // FrameStart command that has already initialized the frame, so we must
      // check for player data too.
      if (this.rollbackFrames[currentFrame.frame]) {
        this.rollbackFrames[currentFrame.frame].push(currentFrame);
      } else {
        this.rollbackFrames[currentFrame.frame] = [currentFrame];
      }
      this.rollbackFrameCount++;
      this.currentRollbackLength++;
      this.lastFrameWasRollback = true;
    } else if (this.lastFrameWasRollback) {
      this.rollbackLengths.push(this.currentRollbackLength);
      this.currentRollbackLength = 0;
      this.lastFrameWasRollback = false;
    }
    return this.lastFrameWasRollback;
  }
  getFrames() {
    return this.rollbackFrames;
  }
  getCount() {
    return this.rollbackFrameCount;
  }
  getLengths() {
    return this.rollbackLengths;
  }
}

export { RollbackCounter };
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