Callback: Extra information about layout in the build gui
From GRFSpecs
Jump to navigationJump to searchExtra information about airport layout in the build gui (155)
This callback allows you to display some extra text in the build airport gui.
| Return value | Version | Meaning |
|---|---|---|
| 0000..03FF | D0xx text to display. | |
| 0400 | GRFv≥8 | Display no text (same as callback failure). |
| 040F |  15  |
Display text using text ID from register 0x100 (not limited to D0xx texts). |
This callback is always called when available, you do not need to set a bit in any action0 property to enable it. Available for OpenTTD since r20272
