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-rw-r--r--src/newgrf_commons.cpp2
-rw-r--r--src/newgrf_commons.h3
2 files changed, 4 insertions, 1 deletions
diff --git a/src/newgrf_commons.cpp b/src/newgrf_commons.cpp
index 6ffd879e0..173997d99 100644
--- a/src/newgrf_commons.cpp
+++ b/src/newgrf_commons.cpp
@@ -105,7 +105,7 @@ uint16 OverrideManagerBase::AddEntityID(byte grf_local_id, uint32 grfid, byte su
for (id = max_offset; id < max_new_entities; id++) {
map = &mapping_ID[id];
- if (map->entity_id == 0 && map->grfid == 0) {
+ if (CheckValidNewID(id) && map->entity_id == 0 && map->grfid == 0) {
map->entity_id = grf_local_id;
map->grfid = grfid;
map->substitute_id = substitute_id;
diff --git a/src/newgrf_commons.h b/src/newgrf_commons.h
index 25933117e..51ebd93b8 100644
--- a/src/newgrf_commons.h
+++ b/src/newgrf_commons.h
@@ -33,6 +33,7 @@ protected:
uint16 max_new_entities; ///< what is the amount of entities, old and new summed
uint16 invalid_ID; ///< ID used to dected invalid entities;
+ virtual bool CheckValidNewID(uint16 testid) { return true; }
public:
EntityIDMapping *mapping_ID; ///< mapping of ids from grf files. Public out of convenience
@@ -76,6 +77,8 @@ public:
struct IndustryTileSpec;
class IndustryTileOverrideManager : public OverrideManagerBase {
+protected:
+ virtual bool CheckValidNewID(uint16 testid) { return testid != 0xFF; }
public:
IndustryTileOverrideManager(uint16 offset, uint16 maximum, uint16 invalid) :
OverrideManagerBase(offset, maximum, invalid) {}