the naming for that in OF is not very correct, we'll change it in a future release surely but it's just rectangular textures. it is an extension that supports non power of 2 texture sizes but in new hardware it's really not needed anymore. it also makes the texture coordinates be in screen coordinates rather than 0..1. and it's sometimes limited in the features that you can use when using it so it's usually better to just disable it unless you are using some older hardware
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