Here is a simple project which just creates a CCRenderTexture and renders some text into it: https://github.com/pfedor/cocos2dx-bug
Here is what the output looks like on my iPad: http://i.imgur.com/nGElz.jpg (file also attached.)
Notice that the fourth row of characters has a horizontal line of weird artifacts striking across it. There are also two similar vertical lines, though they’re harder to see, one going down from the third “1” in the top row and the second one starting at the last-but-one “9” in the top row.
I’ve observed this problem both in the Simulator and on the device, with or without enableRetinaDisplay(), on iOS 5.1 and 6.0, with Xcode 4.4.1 and 4.5.
The problem is not limited to rendering of text, I’ve observed similar fault lines when drawing lines into a CCRenderTexture.
The problem seems specific to CCRenderTexture since when I rendered the exact same text just by creating a CCLabelTTF and adding it to the layer there were no such artifacts.
Looking forward to hearing your thoughts.
nGElz.jpg (707.8 KB)