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[QUESTION] MoP BLP question

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relaxok:
Guys - anybody know what the current status of the BLP format is in MoP (5.x) data?

You've got textures like:
InterfaceGluesModelsUI_SCOURGESILVERPINETREE01CANOPYSKIN.BLP

According to the usual header format, this is DXT5 compressed texture but the alpha depth field is '72', which can't be the alpha bit depth, so is used for some other data now?  

In WOTLK this exact texture had 8 for that field.

The 2nd 4bits are still 8, so maybe this field is actually 2 x nibbles of data?

What is the first 4 bits for?

I'm curious how you can specify anything related to the alpha channel when it comes to DXT/BC[x] compression.. AFAIK it has no options..

happyhack:
if i remember well, there was "72 alpha depth" blp textures in earlier versions of wow already, anyway I use it as DXT5, it just works.

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