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(svn r26294) -Change: [NewGRF] Make vehicle variable 61 return 'not available' instead of zero when using it in invalid callback contexts.

release/1.4
frosch 2014-02-03 21:10:04 +00:00
parent 9ff5aa4b7b
commit 9e5fc88499
1 changed files with 7 additions and 3 deletions
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10
src/newgrf_engine.cpp
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@ -651,13 +651,16 @@ static uint32 VehicleGetVariable(Vehicle *v, const VehicleScopeResolver *object,
}
case 0x61: // Get variable of n-th vehicle in chain [signed number relative to vehicle]
if (!v->IsGroundVehicle() || parameter == 0x61) return 0;
if (!v->IsGroundVehicle() || parameter == 0x61) {
/* Not available */
break;
}
/* Only allow callbacks that don't change properties to avoid circular dependencies. */
if (object->ro.callback == CBID_NO_CALLBACK || object->ro.callback == CBID_RANDOM_TRIGGER || object->ro.callback == CBID_TRAIN_ALLOW_WAGON_ATTACH ||
object->ro.callback == CBID_VEHICLE_START_STOP_CHECK || object->ro.callback == CBID_VEHICLE_32DAY_CALLBACK || object->ro.callback == CBID_VEHICLE_COLOUR_MAPPING) {
Vehicle *u = v->Move((int32)GetRegister(0x10F));
if (u == NULL) return 0;
if (u == NULL) return 0; // available, but zero
if (parameter == 0x5F) {
/* This seems to be the only variable that makes sense to access via var 61, but is not handled by VehicleGetVariable */
@ -666,7 +669,8 @@ static uint32 VehicleGetVariable(Vehicle *v, const VehicleScopeResolver *object,
return VehicleGetVariable(u, object, parameter, GetRegister(0x10E), available);
}
}
return 0;
/* Not available */
break;
case 0x62: { // Curvature/position difference for n-th vehicle in chain [signed number relative to vehicle]
/* Format: zzyyxxFD