NML:Changes 0.3

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Introduction

Between NML 0.2.x and NML 0.3.x (and their corresponding nightlies) the generated NewGRF version by NML changed from v7 to v8. This brings lot of advantages, but requires a few changes to existing NML files. NewGRFs thus will require a minimum OpenTTD version of 1.2.0 (r23166).

Callbacks

NML 0.3 only supports the new style callbacks. Thus all callback_flag properties have been removed as have the callback flag constants *CBF*. For a complete list of affected constants see the related commit

Industry availability

In NewGRF v8 the availability property has been changed to an industry probability, so that more fine-grained control of the availability of an industry becomes feasible. Thus the corresponding constants of the callback have been changed:

  • CB_RESULT_IND_ALLOW is replaced by CB_RESULT_IND_PROBABILITY_FROM_PROPERTY
  • CB_RESULT_IND_DISALLOW is replaced by CB_RESULT_IND_NO_CONSTRUCTION