Callback: Ambient sound effects: Difference between revisions
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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 [[Action11|Action 11]]. |
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 [[Action11|Action 11]]. |
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To decide whether to play a sound, and what sound to play, Var.Action 2 variable 10 holds the following information: |
To decide whether to play a sound, and what sound to play, Var.Action 2 variable 10 holds the following information: |
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* {{grf|7}} For GRF version 7 and below: THRRxxxt |
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* {{grf|8}} For GRF version 8 and above: xTHHRRtt |
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|T||Tile class, 0=bare land, 4=trees, 6=water |
|T||Tile class, 0=bare land, 4=trees, 6=water |
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|HH|| |
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{{grf|7}} Height of north corner of tile (multiple of 8)<br/> |
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{{grf|8}} Height of lowest corner of tile (multiple of 1) |
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|RR||8 random bits |
|RR||8 random bits |
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|xxx||Reserved |
|xxx||Reserved |
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|tt|| |
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* Bits 0..2: Terrain type: 0 normal (grass), 1 desert, 2 rainforest, 4 on or above snowline. |
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* Bits 3..5: {{grf|8}} Water class: 0 - undefined / land; 1 - sea; 2 - canal; 3 - river. |
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Revision as of 20:35, 8 November 2011
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:
- GRFv7 For GRF version 7 and below: THRRxxxt
- GRFv8 For GRF version 8 and above: xTHHRRtt
| Field | Meaning |
|---|---|
| T | Tile class, 0=bare land, 4=trees, 6=water |
| HH |
GRFv7 Height of north corner of tile (multiple of 8) |
| RR | 8 random bits |
| xxx | Reserved |
| tt |
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This callback must be enabled by bit 4 in action D var 9E.