Callback: Ambient sound effects
Ambient sound effects (144)
This callback is a generic callback for feature 0C (new sounds) used for playing ambient sound effects.
The 15-bit return value is the sound effect number. Values from 0 to 72 (dec) are TTD's built-in sound effects, values beyond that refer to the sounds from Action 11.
To decide whether to play a sound, and what sound to play, Var.Action 2 variable 10 holds the following information:
- GRFv≤7 For GRF version 7 and below: THRRxxxt
- GRFv≥8 For GRF version 8 and above: xTHHRRtt
|T||Tile class, 0=bare land, 4=trees, 6=water|
GRFv≤7 Height of north corner of tile (multiple of 8)
|RR||8 random bits|
This callback must be enabled by bit 4 in action D var 9E.