I’m not entirely clear if this extension is accepted by all the vendors. It is described at Apple’s site and I think they are the one who worked on it.
Some of us are waiting for a EXT or ARB version or better yet, put it ion the core already (damn it!)
I heard the EXT version is different and comes from a HP based extensions.
Differences are the texture coordinates management ([0, 1] as always) and allowing all the texture wrapping modes.
I read that on a ARB meeting note but I am not sure.
This is not true. EXT_texture_rectangle has the same features/limitations as NV_texture_rectangle, i.e. texture coordinates are also in [0…w], [0…h]. Even the token definitions are the same.