Difference between revisions of "ReadingOtherGRFParameters"
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(if only assignment is valid, then put it directly into the syntax) |
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| − | '''''Reading another GRF file's parameters''''' |
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==Introduction== |
==Introduction== |
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| − | Since 2.0.1 alpha 16, it has been possible to use action D to read the parameters of other GRF files. With this, you can try to use the settings for another related GRF before falling back to a hard coded default. |
+ | Since TTDPatch 2.0.1 alpha 16, it has been possible to use action D to read the parameters of other GRF files. With this, you can try to use the settings for another related GRF before falling back to a hard coded default. |
| − | ==Format== |
+ | == Format == |
| − | <pre> |
+ | <pre> <Sprite-number> * <Length> 0D <target> 00 <param> FE <GRFID></pre> |
{| class="wikitable" |
{| class="wikitable" |
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|B |
|B |
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|Target parameter |
|Target parameter |
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| − | |- |
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| − | |<operation> |
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| − | |B |
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| − | |As for [[ActionD#operation|action D]], but only assignment is valid. |
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|<param> |
|<param> |
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|Defines a special variable access |
|Defines a special variable access |
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|- |
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| − | |< |
+ | |<GRFID> |
|D |
|D |
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|The GRFID whose parameter you want to read |
|The GRFID whose parameter you want to read |
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|} |
|} |
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| − | This will store parameter <param> of the GRF file with |
+ | This will store parameter <param> of the GRF file with GRFID <GRFID> into the <target> |
With parameter FE you can read the action 14 NewGRF version of another NewGRF in OpenTTD. It returns 0 if no NewGRF version has been set by an action 14. |
With parameter FE you can read the action 14 NewGRF version of another NewGRF in OpenTTD. It returns 0 if no NewGRF version has been set by an action 14. |
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| − | If the |
+ | If the GRFID cannot be found, or if the parameter is not defined, a value of 0 is used instead (no matter whether bit 7 of the operation is set or not). |
Latest revision as of 16:55, 18 March 2015
Introduction
Since TTDPatch 2.0.1 alpha 16, it has been possible to use action D to read the parameters of other GRF files. With this, you can try to use the settings for another related GRF before falling back to a hard coded default.
Format
<Sprite-number> * <Length> 0D <target> 00 <param> FE <GRFID>
| Element | Size | Description |
|---|---|---|
| 0D | B | Defines action 0D |
| <target> | B | Target parameter |
| <param> | B | Parameter number of the other GRF file that you want to read |
| FE | B | Defines a special variable access |
| <GRFID> | D | The GRFID whose parameter you want to read |
This will store parameter <param> of the GRF file with GRFID <GRFID> into the <target>
With parameter FE you can read the action 14 NewGRF version of another NewGRF in OpenTTD. It returns 0 if no NewGRF version has been set by an action 14.
If the GRFID cannot be found, or if the parameter is not defined, a value of 0 is used instead (no matter whether bit 7 of the operation is set or not).
