gust_g1t: support for type 0x48 (3DS)

[smiRaphi]

None of the textures from Spirit Camera - The Cursed Memoir work
0x48_3ds_spirit_cam.zip

[VitaSmith]

Thanks. I'll try to take a look when I get a chance, but it could be a long while...

[eArmada8]

More information on 0x48 (and possibly 0x47, which is apparently the same format without the alpha):

0x48, according to Project_G1M, a form of ETC1 texture that is specific to the PICA200. The ETC1 texture (4 bytes per pixel, 4-bit alpha, etc1a4, I think?) is vertically flipped, endian swapped, tiled with linear 2x2 etc blocks - I think? This is based on the headers in Noesis (which itself is closed source) that Project_G1M depends on.

I attached a sample g1t, and decoded .dds files (using noesis to decode the textures to r8g8b8a8).
00000468.zip

I also found a program that can do 3ds texture conversion, and it has an ETC1 mode and ETC1A4 mode, which I suspect correspond to 0x47 and 0x48 respectively.

Thanks!