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-rw-r--r--newgrf_engine.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/newgrf_engine.c b/newgrf_engine.c
index de61aa01a..5c386ccc9 100644
--- a/newgrf_engine.c
+++ b/newgrf_engine.c
@@ -800,6 +800,52 @@ uint16 GetVehicleCallback(uint16 callback, uint32 param1, uint32 param2, EngineI
return group->g.callback.result;
}
+/**
+ * Evaluate a newgrf callback for vehicles with a different vehicle for parent scope.
+ * @param callback The callback to evalute
+ * @param param1 First parameter of the callback
+ * @param param2 Second parameter of the callback
+ * @param engine Engine type of the vehicle to evaluate the callback for
+ * @param v The vehicle to evaluate the callback for, or NULL if it doesnt exist yet
+ * @param parent The vehicle to use for parent scope
+ * @return The value the callback returned, or CALLBACK_FAILED if it failed
+ */
+uint16 GetVehicleCallbackParent(uint16 callback, uint32 param1, uint32 param2, EngineID engine, const Vehicle *v, const Vehicle *parent)
+{
+ const SpriteGroup *group;
+ ResolverObject object;
+ CargoID cargo;
+
+ NewVehicleResolver(&object, v);
+
+ object.callback = callback;
+ object.callback_param1 = param1;
+ object.callback_param2 = param2;
+
+ object.u.vehicle.parent = parent;
+
+ cargo = (v == NULL) ? GC_PURCHASE : _global_cargo_id[_opt.landscape][v->cargo_type];
+
+ group = engine_custom_sprites[engine][cargo];
+
+ if (v != NULL && v->type == VEH_Train) {
+ const SpriteGroup *overset = GetWagonOverrideSpriteSet(engine, v->u.rail.first_engine);
+
+ if (overset != NULL) group = overset;
+ }
+
+ group = Resolve(group, &object);
+
+ if ((group == NULL || group->type != SGT_CALLBACK) && cargo != GC_DEFAULT) {
+ // This group is empty but perhaps there'll be a default one.
+ group = Resolve(engine_custom_sprites[engine][GC_DEFAULT], &object);
+ }
+
+ if (group == NULL || group->type != SGT_CALLBACK)
+ return CALLBACK_FAILED;
+
+ return group->g.callback.result;
+}
static void DoTriggerVehicle(Vehicle *v, VehicleTrigger trigger, byte base_random_bits, bool first)
{