Correct-er implemenation of psg3/psg4 relationship in deflemask

src/reskit/soundtrack/engines/echo/engine.rs

@@ -309,9 +309,10 @@ pub fn get_events_for_channel( channels: &mut [Channel], active_channel: usize,
     // Key on or key off note
     if let Some( note ) = &row.note {
         if let Note::NoteOff = note {
-            channels[ active_channel ].active_note = None;
+            channels[ active_channel ].note_keyed = false;
             events.push( vec![ ESF_NOTE_OFF | channels[ active_channel ].id ] );
         } else {
+            channels[ active_channel ].note_keyed = true;
             channels[ active_channel ].active_note = Some(
                 OctaveFrequency {
                     octave: note.get_octave()?,
@@ -334,16 +335,24 @@ pub fn get_events_for_channel( channels: &mut [Channel], active_channel: usize,
                     if let Effect::DcsgNoiseMode { mode, noise_type: _ } = dcsg_noise_mode {
                         if mode == &DcsgChannelMode::Ch3Frequency {
                             let index = channels.iter().position( | channel | channel.id == ESF_PSG_3 ).ok_or( "internal error: where is psg3??" )?;
-                            // Copy over the active note to psg3
+                            // Issue a set frequency for psg3 but don't tell the channel state (matches behaviour in deflemask)
-                            channels[ index ].active_note = channels[ active_channel ].active_note;
+                            events.push( vec![
+                                ESF_SET_FREQUENCY | channels[ index ].id,
+                                ( 0x000F & channels[ active_channel ].active_note.ok_or( "internal error: wtf happened here (1)??" )?.frequency ) as u8,
+                                ( ( 0x3F0 & channels[ active_channel ].active_note.ok_or( "internal error: wtf happened here (2)??" )?.frequency ) >> 4 ) as u8
+                            ] );
                         }
                     } else {
                         return Err( "internal error: wtf happened here (3)??" )?
                     }
                 } else {
                     let index = channels.iter().position( | channel | channel.id == ESF_PSG_3 ).ok_or( "internal error: where is psg3??" )?;
-                    // Copy over the active note to psg3
+                    // Issue a set frequency for psg3 but don't tell the channel state (matches behaviour in deflemask)
-                    channels[ index ].active_note = channels[ active_channel ].active_note;
+                    events.push( vec![
+                        ESF_SET_FREQUENCY | channels[ index ].id,
+                        ( 0x000F & channels[ active_channel ].active_note.ok_or( "internal error: wtf happened here (1)??" )?.frequency ) as u8,
+                        ( ( 0x3F0 & channels[ active_channel ].active_note.ok_or( "internal error: wtf happened here (2)??" )?.frequency ) >> 4 ) as u8
+                    ] );
                 }
 
                 if let Some( noise_generator_setting ) = get_noise_generator_setting( note, dcsg_noise_mode )? {
@@ -554,6 +563,18 @@ pub fn compact_delays( events: Vec<EchoEvent> ) -> Result<Vec<EchoEvent>, Box<dy
  * for the next event.
  */
 pub fn get_portamento( channel: &mut Channel, portamento_effect: &Effect ) -> Result<EchoEvent, Box<dyn Error>> {
+    if channel.id != ESF_FM_6_PCM && channel.id != ESF_PSG_4 {
+        // A portamento was called for on this channel, and if none was provided, we need to start with C, octave 0
+        // This replicates the behaviour in deflemask
+        if let None = channel.active_note {
+            channel.active_note = match channel.id {
+                ESF_FM_1..=ESF_FM_3 | ESF_FM_4..=ESF_FM_6 => Some( OctaveFrequency { octave: 0, frequency: get_fm_semitone_frequency( ESF_SEMITONE_C )? } ),
+                ESF_PSG_1..=ESF_PSG_3 => Some( OctaveFrequency { octave: 0, frequency: get_psg_semitone_frequency( 0, ESF_SEMITONE_C )? } ),
+                invalid_channel => return Err( format!( "internal error: get_note: invalid default portamento setting channel {:#04X}", invalid_channel ) )?
+            }
+        }
+    }
+
     Ok(
         if channel.id == ESF_FM_6_PCM || channel.id == ESF_PSG_4 {
             // Generate no events if channel is set to pcm
@@ -639,8 +660,8 @@ pub fn get_note_cut( channel: &mut Channel, note_cut_effect: &Effect, tick: u8 )
     };
 
     if tick >= after_ticks {
-        if channel.active_note.is_some() {
+        channel.note_keyed = false;
-            channel.active_note = None;
+
         // Consume the note cut after we are done with it - it does not remain active
         channel.active_effects = channel.active_effects
                                         .clone()
@@ -649,7 +670,6 @@ pub fn get_note_cut( channel: &mut Channel, note_cut_effect: &Effect, tick: u8 )
                                         .collect();
         return Ok( vec![ ESF_NOTE_OFF | channel.id ] );
     }
-    }
 
     // Nothing to generate this tick
     Ok( vec![] )

src/reskit/soundtrack/types.rs

@@ -98,6 +98,7 @@ pub struct Channel {
     pub id: u8,
     pub active_instrument: Option<u16>,
     pub active_note: Option<OctaveFrequency>,
+    pub note_keyed: bool,
     pub current_volume: Option<u8>,
     pub active_effects: LinkedHashSet<Effect>
 }
@@ -144,6 +145,7 @@ impl Channel {
             id,
             active_instrument: None,
             active_note: None,
+            note_keyed: false,
             current_volume: None,
             active_effects: LinkedHashSet::new()
         }