Function advance

packages/shared/src/FrameLoop.ts:91–118

(dt: number)

}

function advance(dt: number) {
  const nextFrame = prevFrame

  for (let i = 0; i < currentFrame.length; i++) {
    const animation = currentFrame[i]
    priority = animation.priority

    // Animations may go idle before advancing.
    if (!animation.idle) {
      G.willAdvance(animation)
      animation.advance(dt)
      if (!animation.idle) {
        nextFrame.push(animation)
      }
    }
  }
  priority = 0

  // Reuse the `currentFrame` array to avoid garbage collection.
  prevFrame = currentFrame
  prevFrame.length = 0

  // Set `currentFrame` for next frame, so the `start` function
  // adds new animations to the proper array.
  currentFrame = nextFrame

  return currentFrame.length > 0
}

/** Like `Array.prototype.findIndex` but returns `arr.length` instead of `-1` */
function findIndex<T>(arr: T[], test: (value: T) => boolean) {