AFSM (File Format)
The AFSM format controls AI behavior; it stands for AI Finite State Machine. AI-controlled creatures have a limited number of possible states they can be in. The AFSM file defines those states, and what triggers can cause it to advance to another state.
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This file format is almost completely documented We should have a list of possible states and trigger conditions and a short explanation of what they generally do on this page somewhere. Also, the float settings on conditions is unknown. |
Format
Header
The format first defines a list of states, then defines each trigger attached to each state. There are no state/trigger type IDs; rather, the name string itself is used as an identifier to fetch the corresponding AI function. It starts with a short header listing each state and then providing a trigger count. Note that the trigger count isn't actually used to parse the file; it's present merely because the game uses it to allocate space for each trigger ahead of time.
| Type | Count | Description |
|---|---|---|
| long | 1 | State count (SC) |
| string | SC | State names (each zero-terminated) |
| long | 1 | Condition count |
State Triggers
Following that, it iterates through each state, defining the triggers associated with each one. Triggers are composed of a target state index and a number of conditions; when all the conditions associated with a trigger are satisfied, it advances to the targeted state. The state trigger definitions are structured like this:
| Type | Count | Description |
|---|---|---|
| long | 1 | Trigger count (TC) |
| Trigger | TC | Triggers |
Trigger
| Type | Count | Description |
|---|---|---|
| long | 1 | Condition count (CC) |
| Trigger condition | CC | Conditions |
Condition
| Type | Count | Description |
|---|---|---|
| string | 1 | Condition name (zero terminated) |
| float | 1 | Unknown (possibly AI function parameter) |
| long | 1 | Target state index (note: this is ONLY present on the first condition for each trigger!) |