Cocos2d-x by Example：Beginner's Guide（Second Edition）

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Time for action – adding retina support

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

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);

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 are only targeting iPads. Here we are saying: "Hey AppDelegate, I designed this game for a 768 x 1024 screen."

All the values for positioning and font size were chosen for that screen size. If the screen is larger, make sure you grab the files from the hd folder and change the scale by which you will multiply all my positioning and font sizes. If the screen has the same size I designed the game for, use the files in the sd folder and set the scale to 1. (Android adds even more complexity to this, but we'll tackle that in later in the book.)

FileUtils will look for every file you load for your game first inside Resources | sd (or hd). If it doesn't find them there, it will try to find them in Resources. This is a good thing because files shared by both versions may be added only once to the project, inside Resources. That is what we'll do now with the sound files.