mirror of https://github.com/notwa/baku
87 lines
2.2 KiB
Plaintext
87 lines
2.2 KiB
Plaintext
Bomberman 64 (U):
|
|
|
|
80225A74 main game loop (the branch, specifically)
|
|
802259F4 main game loop (first jal)
|
|
800655F8 copyright screen wait timer (and seemingly has other uses)
|
|
$12C gets written by 80238DDC (generic?)
|
|
start of function: 80238D98
|
|
wrapper function: 8023900C
|
|
calls where A0 (frame time) > 1:
|
|
RA: 800434B4 (A0=$14)
|
|
RA: 8004356C (A0=$12C)
|
|
A0=$12C is set at 80043568, so change that to 1 and...
|
|
|
|
decomp routine struct: 8014B808
|
|
LW ($4) might be ROM offset?
|
|
LW ($8) is current offset into compressed file?
|
|
rom$162008 start of compressed file?
|
|
rom$160000 points to that start (confirmed, it adds 0x00160000 from A2 at 80226758)
|
|
rom$163B62 start of second file (again, starts with decomp length)
|
|
breakpoint at 80292C90 to only see raw bytes being written (in V0)
|
|
for compression format details, refer to:
|
|
https://github.com/PartyPlanner64/PartyPlanner64/wiki/Compression#compression-type-1
|
|
ring-buffer?: 80305000
|
|
|
|
seems like the rom is split into 0x20000 chunks (128 KiB, 1 megabit)
|
|
first chunk is at 0x120000?
|
|
err wait, that doesn't work for 0x200000; it's 0x40000 long!
|
|
|
|
anyway back at the rom:$160000
|
|
let's tear apart this header.
|
|
it's entirely s32s, so that's simple enough.
|
|
first word: $00002008
|
|
this is the offset from this position into the first (compressed) file.
|
|
next: $00000400
|
|
not sure what this is. number of entries in this header? always seems to be 0x400.
|
|
next: $00000000
|
|
offset to first file. added to the initial 0x2008.
|
|
next: $00000016
|
|
size of first file.
|
|
next: $00000016
|
|
offset of second file. added to the initial 0x2008.
|
|
next: $00001B44
|
|
this is the compressed size of the second file.
|
|
next: the rest of the entries follow this pattern of (offset, size).
|
|
(except $FFFFFFFF means no file)
|
|
|
|
now what's the data at rom$162008?
|
|
first byte: $09
|
|
i think this is the number of entries in this sub-header,
|
|
except it's not. maybe it indicates the type of something?
|
|
|
|
rom$162008:
|
|
09
|
|
00 20 01
|
|
00 21 02
|
|
00 23 03
|
|
00 25 04
|
|
00 26 05
|
|
00 1F 06
|
|
00 22 07
|
|
00 00 2F 80
|
|
|
|
rom$182008:
|
|
0A
|
|
00 28 01
|
|
00 29 02
|
|
00 2A 03
|
|
00 2B 04
|
|
00 2C 05
|
|
00 2D 06
|
|
00 2E 07
|
|
00 2F 08
|
|
00 30 09
|
|
00 31 0A
|
|
00 (halfword padding?)
|
|
00 00 79 80
|
|
|
|
rom$1A2008:
|
|
07
|
|
00 38 01
|
|
00 39 02
|
|
00 3A 03
|
|
00 3B 04
|
|
00 3C 05
|
|
00 3D 06
|
|
00 3E 07
|