Sparrow, the game framework I used in my iOS programming tutorial on creating an action game, has recently added a new feature to easily handle the higher screen resolutions provided by the retina display of the iPhone 4. I hope to update the tutorial to utilize this new feature in the near future. A new Sparrow Tutorial from the creators of this grame framework illustrates the process.
The process involves using tools that are included with the Sparrow Framework that will automatically create all the required textures from your high definition textures.
You can find the step-by-step tutorial from the creators of sparrow here:
How To Make HD Games With Sparrow
The new feature is in Sparrow 0.9 which can be found here.
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