SCI: queuing signal, if signal not passed to scripts

fixes laura bow 1 when knocking at the door in the attic, scripts wait for 0xb in that case, sound resource sets 0xb and then immediately ends. This resulted in the scripts only getting the termination signal, so they waited endlessly. (bug #3042981)

svn-id: r52043

1 files changed, 12 insertions, 2 deletions

diff --git a/engines/sci/sound/midiparser_sci.cpp b/engines/sci/sound/midiparser_sci.cpp
index 6ec28a8b02..769df73365 100644
--- a/engines/sci/sound/midiparser_sci.cpp
+++ b/engines/sci/sound/midiparser_sci.cpp
@@ -445,7 +445,12 @@ void MidiParser_SCI::parseNextEvent(EventInfo &info) {
 	}
 	if (_signalSet) {
 		_signalSet = false;
-		_pSnd->signal = _signalToSet;
+		if (!_pSnd->signal) {
+			_pSnd->signal = _signalToSet;
+		} else {
+			// signal already set and waiting for getting to scripts, queue new one
+			_pSnd->signalQueue.push_back(_signalToSet);
+		}
 		debugC(4, kDebugLevelSound, "signal %04x", _signalToSet);
 	}
 
@@ -608,7 +613,12 @@ void MidiParser_SCI::parseNextEvent(EventInfo &info) {
 					jumpToTick(_loopTick);
 				} else {
 					_pSnd->status = kSoundStopped;
-					_pSnd->signal = SIGNAL_OFFSET;
+					if (!_pSnd->signal) {
+						_pSnd->signal = SIGNAL_OFFSET;
+					} else {
+						// signal already set and waiting for getting to scripts, queue new one
+						_pSnd->signalQueue.push_back(SIGNAL_OFFSET);
+					}
 
 					debugC(4, kDebugLevelSound, "signal EOT");
 				}