reverse every other line of the array

snake.cpp

// calculate x and y positioning of the pixel selected

auto y = pixel / 16;
auto shouldSnake = y % 2 == 0;
auto prevPixels = y * 16;
  
auto regularX = (pixel % 16);
auto snakeX = (15 - regularX);
  
auto x = shouldSnake ? snakeX : regularX;
auto snakePixelId = x + (lineOffset);