Enemy AI

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Notes on Enemy AI are currently incomplete; eventually, data will be decoded and added into Temporal Flux for functionality. Enemy AI information will be updated as new stuff comes.

Offsets

Directly from Geiger's Offsets.txt
___________________________________________________________________
0C8B08 0C8D07 PTR No No Pointers to Enemy AI (local) 6/21/2004
0C8D08 0CCBC8 AI No No Enemy AI 7/14/2003
___________________________________________________________________



Summary

Enemy AI is divided into two blocks that terminate with FF.

AAAAAAAAFF
BBBBBBBBFF

The first block contains actions that the enemy performs on its own. The second block contains reactions when the enemy is attacked.

Each block can be broken down into sections that alternate between Condition and Action.


Condition

Conditions are a multiple of 4 bytes, each of which is a boolean statement. All must be true for the following Action section to be executed. The section is terminated by $FE.

Action

Actions can contain one or more commands to perform. An enemy's attack meter must refill first before it can continue with the next command. The section is terminated by $FE.

Conditions

There is a total of 41 Conditions ($00-28)

00 ?? ?? ?? nothing.  continue with following Action
01 hh ?? ?? check health.  hh - 03=50%
02 ?? ?? ??
03 ?? mm ?? unknown.  mm - monster index
04 ?? mm ?? check if monster is alive.  mm - monster index
05 nn ?? ?? check number of enemies.  nn - minimum? number of enemies that must exist for the following Action to be executed
06 ?? ?? ??
07 nn ?? ?? check times attacked.  nn - number of times the enemy must be attacked for the following Action section to be executed
08 ?? ?? ??
09 ?? ?? ??
0A ?? ?? ??
0B ?? ?? ??
0C ?? ?? ??
0D ?? ?? ??
0E ?? ?? ??
0F ?? ?? ??
10 ?? ?? ?? (only used once for Enemy $F8 R Series?)
11 ?? ?? ??
12 ?? tt ?? if hit with tech.  tt - tech index
13 ?? ?? ??
14 ?? ?? ??
15 ee ?? ?? if hit by attack.  ee - 80=lightning
16 ?? ?? ?? (possibly unused)
17 cc ?? ?? load random number.  cc - chance to execute following Action
18 ii ?? ?? if hit by specific weapon.  ii - weapon index
19 ?? ?? ??
1A mm nn ?? if  number monsters alive?? -- mm monster index, nn number needed to be alive
1B nn ?? ?? if num pc's  (alive?) -- number of pc's
1C ?? ?? ??
1D ?? ?? ??
1E ?? ?? ??
1F ?? ?? ?? check distance.
20 ?? ?? ?? check if defeated.
21 ?? ?? ??
22 ?? ?? ??
23 ?? ?? ?? (same as 18)
24 ?? ?? ?? (same as 18)
25 ?? ?? ?? (same as 18)
26 ?? ?? ?? (same as 18)
27 ?? ?? ?? (same as 18)
28 ?? ?? ?? (same as 18)


Older data not 100% confirmed:


05 XX 00 00 - number of enemies atleast XX
40 00 XX 01 - If monster XX is dead...byte 2/4 unexplored
09 00 00 00 - Physical Counter.
10 00 00 00 - Always Counter.
11 00 00 00 - Magical Counter.
15 XX 00 00 - Elemental Counter - 20 Ice, 10 Fire, 80 Lightning, 40 Shadow, 00 Physical. (02 and 04 have been used, only saw them skimming the listings)
1F 04 XX 00 - Is enemy distant (non-zero) or up close (zero)?

Actions

There is a total of 23 Actions ($00-16)

00 ?? ?? ??  wander mode.
01 aa ww ??  attack mode.  aa - attack index ww - who to attack: 05 random pc 06 nearest pc 08 pc using unknown hp conditions
02 tt ww ?? ?? ss  tech mode.  tt - tech index ww - who to attack: 05 random pc 06 nearest pc 08 pc using unknown hp conditions ss - battle enemy message string
03 (nothing, no routines)
04  random action.  uses a random number to determine which action in current section to start on.
05 ?? ??  unknown.  not confirmed if it is a 3 byte command.  unused?
06 (nothing, no routines)
07 mm aa hh  become monster.  mm - monster to turn into aa - animation? hh - hp
08 (nothing, no routines)
09 ??  display flashes for distant attack?
0A aa ss  run away.  aa - action to show ss - battle enemy message string
0B oo vv mm ss  set stat.  oo - offset from enemy stat set start vv - value to set/bitwise OR mm - mode, 00 set value 01 bitwise OR ss - battle enemy message string
0C oo vv ss  stat math.  oo - offset from enemy stat set start vv - multipurpose byte, 80 subtract flag, 7F amount to add/sub ss - battle enemy message string
0D ?? ss  unknown, state change?  ss - battle enemy message string
0E (nothing, no routines)
0F ss  display text.  ss - battle enemy message string
10 vv ee ss  revive support enemies.  vv - unk. stored to 7E000E ee - battle sound effect ss - battle enemy message string
11 ?? ?? ?? ?? ?? ?? ?? ?? ??
12 ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ss  unknown. ss - battle enemy message string
13 ?? ??  unknown.  not confirmed if it is a 3 byte command.  unused?
14 oo vv oo vv oo vv oo vv ss  multi stat math.  oo - offset from enemy stat set start vv - multipurpose byte, 80 subtract flag, 7F amount to add/sub ss - battle enemy message string
15 ?? ?? ?? ?? oo vv oo vv oo vv oo vv oo vv ss  multi stat math.  oo - offset from enemy stat set start vv - multipurpose byte, 80 subtract flag, 7F amount to add/sub ss - battle enemy message string
16 ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ??


Older data not 100% confirmed:


00 WW XX YY            - wander mode YY is how you wander, WW animation related?
02 WW 05 XX YY ZZ      - Spell WW, Message ZZ, XX YY for double/triple?

Supplemental Material

From: Offsets (Chrono Trigger)