Difference between revisions of "ReadingOtherGRFParameters"

From GRFSpecs
Jump to navigationJump to search
m (Beautify wiki markup)
(if only assignment is valid, then put it directly into the syntax)
 
(3 intermediate revisions by one other user not shown)
Line 1: Line 1:
 
==Introduction==
 
==Introduction==
   
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> -+&lt;Sprite-number&gt; * &lt;Length&gt; 0D &lt;target&gt; &lt;operation&gt; &lt;param&gt; FE &lt;grfid&gt;+-</pre>
+
<pre> &lt;Sprite-number&gt; * &lt;Length&gt; 0D &lt;target&gt; 00 &lt;param&gt; FE &lt;GRFID&gt;</pre>
   
 
{| class="wikitable"
 
{| class="wikitable"
Line 20: Line 20:
 
|B
 
|B
 
|Target parameter
 
|Target parameter
|-
 
|&lt;operation&gt;
 
|B
 
|As for [[ActionD#operation|action D]], but only assignment is valid.
 
 
|-
 
|-
 
|&lt;param&gt;
 
|&lt;param&gt;
Line 33: Line 29:
 
|Defines a special variable access
 
|Defines a special variable access
 
|-
 
|-
|&lt;grfid&gt;
+
|&lt;GRFID&gt;
 
|D
 
|D
 
|The GRFID whose parameter you want to read
 
|The GRFID whose parameter you want to read
 
|}
 
|}
   
This will store parameter &lt;param&gt; of the GRF file with grfid &lt;grfid&gt; into the &lt;target&gt;
+
This will store parameter &lt;param&gt; of the GRF file with GRFID &lt;GRFID&gt; into the &lt;target&gt;
   
 
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.
   
If the GRF ID 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).
+
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).