Time for action – adding retina support

This time we'll work with the class AppDelegate.cpp:

1. Go to AppDelegate.cpp (you'll find it in the Classes folder). Inside the applicationDidFinishLaunching method, and below the director->setAnimationInterval(1.0 / 60) line, add the following lines:

   auto screenSize = glview->getFrameSize();
   auto designSize = Size(768, 1024);
   glview->setDesignResolutionSize(designSize.width, designSize.height, ResolutionPolicy::EXACT_FIT);
   
   std::vector<std::string> searchPaths;
   if (screenSize.width > 768) {
       searchPaths.push_back("hd");
       director->setContentScaleFactor(2);
   } else  {
       searchPaths.push_back("sd");
       director->setContentScaleFactor(1);
   }
   auto fileUtils = FileUtils::getInstance();
   fileUtils->setSearchPaths(searchPaths);

2. Save the file.

What just happened?

An entire book could be written about this topic, although in this first example, we have a very simple implementation on how to support multiple screen sizes since we...