Feature: Support for Buffy The Vampire Slayer: Chaos Bleeds

[joshbarrass]

As discussed briefly in #31, support for the Xbox/GC version(s) of this game would be great.

EDB version for this game is known to be 170.

I've done some brief testing with the Xbox version of the game as starting point for this.

What works:

• Filelist.bin extraction seems to work perfectly.
• Entities/meshes seems to work perfectly when using the same mesh type as Hero's Tail (EDB version 240).
• Texture extraction is working, but (for the Xbox version at least) does not work if the data_size field is used in EXGeoTexture. An additional condition was added for this.

What doesn't work:

• Map extraction. The entities for the map can be extracted, but at this point the program crashes. This is presumably the same as the two Sphinx games.

What hasn't been tested:

• Spreadsheet extraction.

[joshbarrass]

I've pushed the changes I made to get it this far to my fork, in case this helps (though there are no substantial changes so far).

[joshbarrass]

I've managed to make some progress on fixing the texture extraction. Every file I've tried reports a data size of 88, which is not correct, so the calculated data size must be used instead. This allows the correct amount of data to be read, but produces a corrupted texture. By comparing with copies of the texture I already have, I've found that the frame offsets are all out by 84. Changing this line from

edb.seek(std::io::SeekFrom::Start(frame_offset.offset_absolute()))?;

to

edb.seek(std::io::SeekFrom::Start(frame_offset.offset_absolute() + 84))?;

(see the full changes in my fork) will allow textures to be extracted correctly for every EDB file I have tried in this game.

Every data size coming out as 88 and the modification to the frame offset being +84 seems quite close. It would be interesting to try a few more files and see if any of them have data sizes that aren't 88, and whether this affects the frame offset. Maybe this is another offset parameter? I'm not too versed in the structure of these files, so it would be good to get some input from someone else.

[joshbarrass]

Ah, I added another case to texture.rs to not create the data_size field (as is already done for PC and PS2) when working with Chaos Bleeds (version == 170 && platform == Platform::Xbox). This removes the need to manually correct the offset, and the textures can be extracted properly with little additional modification.