Fix arpeggio to work better with the new way to handle note offsets

Ok, not really related to memory management, but was something that needed doing and it's easier to test things when things work properly

src/core/InstrumentFunctions.cpp

@@ -260,8 +260,10 @@ void InstrumentFunctionNoteStacking::processNote( NotePlayHandle * _n )
 
 				// create sub-note-play-handle, only note is
 				// different
-				NotePlayHandleManager::acquire( _n->instrumentTrack(), _n->offset(), _n->frames(), note_copy,
-									_n, -1, NotePlayHandle::OriginNoteStacking );
+				engine::mixer()->addPlayHandle( 
+						NotePlayHandleManager::acquire( _n->instrumentTrack(), _n->offset(), _n->frames(), note_copy,
+									_n, -1, NotePlayHandle::OriginNoteStacking )
+						);
 			}
 		}
 	}
@@ -377,7 +379,7 @@ void InstrumentFunctionArpeggio::processNote( NotePlayHandle * _n )
 						cnphv.first()->totalFramesPlayed() :
 						_n->totalFramesPlayed() ) + arp_frames - 1;
 	// used for loop
-	f_cnt_t frames_processed = 0;
+	f_cnt_t frames_processed = ( m_arpModeModel.value() != FreeMode ) ? cnphv.first()->noteOffset() : _n->noteOffset();
 
 	while( frames_processed < engine::mixer()->framesPerPeriod() )
 	{
@@ -471,12 +473,14 @@ void InstrumentFunctionArpeggio::processNote( NotePlayHandle * _n )
 
 		// create sub-note-play-handle, only ptr to note is different
 		// and is_arp_note=true
-		NotePlayHandleManager::acquire( _n->instrumentTrack(),
-							( ( m_arpModeModel.value() != FreeMode ) ?  cnphv.first()->offset() : _n->offset() ) + frames_processed,
+		engine::mixer()->addPlayHandle(
+				NotePlayHandleManager::acquire( _n->instrumentTrack(),
+							frames_processed,
 							gated_frames,
 							note( MidiTime( 0 ), MidiTime( 0 ), sub_note_key, (volume_t) qRound( _n->getVolume() * vol_level ),
 									_n->getPanning(), _n->detuning() ),
-							_n, -1, NotePlayHandle::OriginArpeggio );
+							_n, -1, NotePlayHandle::OriginArpeggio )
+				);
 
 		// update counters
 		frames_processed += arp_frames;

src/core/NotePlayHandle.cpp

@@ -145,10 +145,6 @@ void NotePlayHandle::done()
 		m_instrumentTrack->m_notes[key()] = NULL;
 	}
 
-	foreach( NotePlayHandle * n, m_subNotes )
-	{
-		NotePlayHandleManager::release( n );
-	}
 	m_subNotes.clear();
 
 	delete m_filter;
@@ -295,14 +291,15 @@ void NotePlayHandle::play( sampleFrame * _working_buffer )
 	}
 
 	// play sub-notes (e.g. chords)
-	foreach( NotePlayHandle * n, m_subNotes )
+	// handled by mixer now
+/*	foreach( NotePlayHandle * n, m_subNotes )
 	{
 		n->play( _working_buffer );
 		if( n->isFinished() )
 		{
 			NotePlayHandleManager::release( n );
 		}
-	}
+	}*/
 
 	// update internal data
 	m_totalFramesPlayed += framesThisPeriod;
@@ -363,7 +360,9 @@ void NotePlayHandle::noteOff( const f_cnt_t _s )
 	// first note-off all sub-notes
 	foreach( NotePlayHandle * n, m_subNotes )
 	{
+		n->lock();
 		n->noteOff( _s );
+		n->unlock();
 	}
 
 	// then set some variables indicating release-state
@@ -549,7 +548,7 @@ void NotePlayHandle::resize( const bpm_t _new_tempo )
 NotePlayHandleList NotePlayHandleManager::s_nphCache;
 NotePlayHandleList NotePlayHandleManager::s_available;
 QMutex NotePlayHandleManager::s_mutex;
-
+QAtomicInt NotePlayHandleManager::s_availableIndex;
 
 void NotePlayHandleManager::init()
 {
@@ -565,6 +564,7 @@ void NotePlayHandleManager::init()
 		s_available += n;
 		++n;
 	}
+	s_availableIndex = INITIAL_NPH_CACHE - 1;
 }
 
 
@@ -576,14 +576,12 @@ NotePlayHandle * NotePlayHandleManager::acquire( InstrumentTrack* instrumentTrac
 				int midiEventChannel,
 				NotePlayHandle::Origin origin )
 {
-	if( s_available.isEmpty() )
+	if( s_availableIndex < 0 )
 	{
 		extend( NPH_CACHE_INCREMENT );
 	}
 	
-	s_mutex.lock();
-		NotePlayHandle * nph = s_available.takeFirst();
-	s_mutex.unlock();
+	NotePlayHandle * nph = s_available.at( s_availableIndex.fetchAndAddOrdered( -1 ) );
 	
 	new( (void*)nph ) NotePlayHandle( instrumentTrack, offset, frames, noteToPlay, parent, midiEventChannel, origin );
 	return nph;
@@ -593,9 +591,7 @@ NotePlayHandle * NotePlayHandleManager::acquire( InstrumentTrack* instrumentTrac
 void NotePlayHandleManager::release( NotePlayHandle * nph )
 {
 	nph->done();
-	s_mutex.lock();
-		s_available += nph;
-	s_mutex.unlock();
+	s_available[ s_availableIndex.fetchAndAddOrdered( 1 ) + 1 ] = nph;
 }
 
 
@@ -603,12 +599,11 @@ void NotePlayHandleManager::extend( int i )
 {
 	NotePlayHandle * n = MM_ALLOC( NotePlayHandle, i );
 
-	s_mutex.lock();
 	for( int j=0; j < i; ++j )
 	{
 		s_nphCache += n;
 		s_available += n;
+		s_availableIndex.ref();
 		++n;
 	}
-	s_mutex.unlock();
 }