ReadingOtherGRFParameters: Difference between revisions
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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. |
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==Format== |
== Format == |
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<pre> |
<pre> <Sprite-number> * <Length> 0D <target> 00 <param> FE <GRFID></pre> |
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|B |
|B |
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|Target parameter |
|Target parameter |
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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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|< |
|<GRFID> |
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|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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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> |
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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). |
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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).