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-rw-r--r--src/newgrf_sound.cpp13
1 files changed, 12 insertions, 1 deletions
diff --git a/src/newgrf_sound.cpp b/src/newgrf_sound.cpp
index cbb6d512f..e5ab65d90 100644
--- a/src/newgrf_sound.cpp
+++ b/src/newgrf_sound.cpp
@@ -51,6 +51,12 @@ uint GetNumSounds()
}
+/**
+ * Checks whether a NewGRF wants to play a different vehicle sound effect.
+ * @param v Vehicle to play sound effect for.
+ * @param event Trigger for the sound effect.
+ * @return false if the default sound effect shall be played instead.
+ */
bool PlayVehicleSound(const Vehicle *v, VehicleSoundEvent event)
{
const GRFFile *file = GetEngineGRF(v->engine_type);
@@ -63,10 +69,15 @@ bool PlayVehicleSound(const Vehicle *v, VehicleSoundEvent event)
if (!HasBit(EngInfo(v->engine_type)->callback_mask, CBM_VEHICLE_SOUND_EFFECT)) return false;
callback = GetVehicleCallback(CBID_VEHICLE_SOUND_EFFECT, event, 0, v->engine_type, v);
+ /* Play default sound if callback fails */
if (callback == CALLBACK_FAILED) return false;
+
if (callback >= ORIGINAL_SAMPLE_COUNT) {
callback -= ORIGINAL_SAMPLE_COUNT;
- if (callback > file->num_sounds) return false;
+
+ /* Play no sound if result is out of range */
+ if (callback > file->num_sounds) return true;
+
callback += file->sound_offset;
}