fixed bug with expiring loop sounds for global animations when playing

When playing the game, loop sounds are automatically expired if they
are not "refreshed" at regular intervals (to prevent playing sounds
for game elements that do not exist on the playfield anymore).

However, this also affects loop sounds for global animations played
during the game, so special care has to be taken to prevent them from
accidentally being expired, too.

diff --git a/src/anim.c b/src/anim.c
index 1623cdc4685b6da6d5c8ae52c862e3256e41aa56..fbc88c351e5e33ca498db163bb57dde6117794a2 100644 (file)
--- a/src/anim.c
+++ b/src/anim.c
@@ -959,6 +959,28 @@ static void StopGlobalAnimSoundAndMusic(struct GlobalAnimPartControlInfo *part)
   StopGlobalAnimMusic(part);
 }
 
+static void PlayGlobalAnimSoundIfLoop(struct GlobalAnimPartControlInfo *part)
+{
+  // when drawing animations to fading buffer, do not play sounds
+  if (drawing_to_fading_buffer)
+    return;
+
+  // loop sounds only expire when playing
+  if (game_status != GAME_MODE_PLAYING)
+    return;
+
+  // check if any sound is defined for this animation part
+  if (part->sound == SND_UNDEFINED)
+    return;
+
+  // normal (non-loop) sounds do not expire when playing
+  if (!IS_LOOP_SOUND(part->sound))
+    return;
+
+  // prevent expiring loop sounds when playing
+  PlayGlobalAnimSound(part);
+}
+
 static boolean isClickablePart(struct GlobalAnimPartControlInfo *part, int mask)
 {
   struct GraphicInfo *c = &part->control_info;
@@ -1229,6 +1251,9 @@ int HandleGlobalAnim_Part(struct GlobalAnimPartControlInfo *part, int state)
     return ANIM_STATE_WAITING;
   }
 
+  // special case to prevent expiring loop sounds when playing
+  PlayGlobalAnimSoundIfLoop(part);
+
   if (!DelayReachedExt(&part->step_delay, part->step_delay_value,
                       anim_sync_frame))
     return ANIM_STATE_RUNNING;