Texture format

Engine supports maximum size of 256x256 pixels. On Windows textures use .pc extension, on Dreamcast they use .DC extension, and on Playstation2 they use .ps2 extension

Offset	Size	Description
0x0	0x4	Magic, T54 4D 21 1A (TM!\x1A)
0x4	0x2	version, set to 2 for .ps2 files, 3 for .pc, 4 for .dc, 5 for .ps2 (w. aplha?)
0x6	0x2	width
0x8	0x2	height
0xA	0x2	first pixel
0xC	??	Compressed data, until EOF

• compressed image data starts at 0xA, see pc_unpack.py for implementation details

Version 2 (PS2)

• Not much is known, other that it's vastly different to PC & DC versions

Version 3 (PC)

• Each pixel is written on 2 bytes, little endian, after converting to big endian the algorithm looks like this:
• If the 15th bit is 1, then stream data as long as each compressed pixel 15th bit is set
  • Else
    • If 14th bit is set copy previously unpacked data
      • bits 11-13 - number of pixels to repeat - 2, so if this number is set to 7, then repeat 9 pixels, minimum 2 pixels
      • bits 0-10 - offset - back head for copying that many pixels
      • else - add transparent pixels
        • bits 0-13 - how many transparent pixels to add
• 00 00 marks the end of compressed data

Version 4 (DC)

• Uses the same compression as version 3, but the resulting files are swizzled for Dreamcast GPU, so untwiddling is needed

Version 5(PS2)

• Same as version 3, with red and blue channels swapped

Unpacked image data (PC and DC)

Uncompressed image data uses 2 bytes for each pixel, in A1 R5 G5 B5 format. In some places game uses additional file with greyscale alpha channel to compensate for 1bit alpha (5 bits instead of 1).