This document describes non-standard additions to the Official OpenTTD NML Specifications which are present in this patchpack and the associated NML fork.
These additions MAY also be present in other patchpacks. They MAY be removed or moved in future, if necessary.
Not all standard NewGRF features are supported by NML, consequently not all non-standard additions to the specifications are supported by this patchpack's associated NML fork, or are listed in this document.
See the associated non-NML document for more details.
All of the non-standard features listed below will automatically emit suitable feature tests, conditionals, etc. such that NewGRFs which use these features will work correctly on OpenTTD versions which do not support these features, including standard trunk OpenTTD and older/other patchpack versions.
| Property | Value range | Comment |
|---|---|---|
| enable_programmable_pre_signals | 0 or 1 |
Enable programmable pre-signal graphics in railtype signals. Programmable pre-signals have a signal type (getbits(extra_callback_info2, 16, 8)) of 6. |
| enable_restricted_signals | 0 or 1 |
Enable restricted signal flag in railtype signals. When enabled, bit 24 of variable extra_callback_info2 is set if the signal is restricted (has a routing restriction program attached). When enabled, the "Show restricted electric signals using default graphics" client setting and signal post recolouring is not applied. This flag must only be set if a different sprite is returned when bit 24 of extra_callback_info2 is set. |
| Property | Value range | Comment |
|---|---|---|
| roadtype_extra_flags | bitmask(ROADTYPE_EXTRA_FLAG_XXX, ...) |
|
| Property | Value range | Comment |
|---|---|---|
| tramtype_extra_flags | bitmask(TRAMTYPE_EXTRA_FLAG_XXX, ...) |
|
| Type | Number of sprites | Comment | ||||||
|---|---|---|---|---|---|---|---|---|
| PROGRAMMABLE_PRE_SIGNAL | 32 |
Programmable pre-signals
Signal graphics come in groups of 16. These groups contain sprites in the same order as sprites 1275-1290 in trg1[r].grf and Action 5 type 4 (signals); red, then green, for each of: SW-facing, NE-facing, NW-facing, SE-facing, E-facing, W-facing, S-facing, N-facing.
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