ReadingOtherGRFParameters

Reading another GRF file's parameters

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.

Format

 -+<Sprite-number> * <Length> 0D <target> <operation> <param> FE <grfid>+-

Element	Size	Description
0D	B	Defines action 0D
<target>	B	Target parameter
<operation>	B	As for action D, but only assignment is valid.
<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 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).