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doesnotcompute

Reversing DXT endianess

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I'm trying to write a DXT compressed image (just DXT1 for now) so that it can be read on a big endian system (XBox 360) and I seem to be having some problems.

I know the block structure contains two 16-bit RGB colors followed by a 4x4 2-bit lookup table. I'm assuming I'm supposed to reverse the byte order of the two colors, but I'm not sure what I'm supposed to do with the table. Do I leave it alone, swap every pair of two bytes, swap all four bytes as if it were a 32-bit integer? I've tried just about every variation I can think of, but I'm not getting correct results so I just wanted to see if anyone knows correct procedure (which I may or may not have already tried and somehow gotten wrong).

Thanks!

EDIT: Looks like reversing every 2 byte pair did the trick. Not sure why it didn't seem to be working at first, may have been testing stale data.

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