So in our update method, you will find the following lines of code:

if (_player->getVector().x > 0) {
  _background->setPositionX(_background->getPosition().x -  _player->getVector().x * 0.25f);

First, we move the _background sprite, which contains the cityscape texture repeated three times along the x axis, and we move it at one-fourth of the speed of the _player sprite.

The _background sprite scrolls to the left, and as soon as the first cityscape texture is off the screen, we shift the entire _background container to the right at precisely the spot where the second cityscape texture would appear if allowed to continue. We get this value by subtracting where the sprite would be from the total width of the sprite:

float diffx;
  
if (_background->getPositionX() < -_background ->getContentSize().width) {
  diffx = fabs(_background->getPositionX()) - _background...