Small refactor

src/reskit/soundtrack/engines/echo.rs

@@ -433,25 +433,13 @@ fn compact_delays( events: Vec<EchoEvent> ) -> Result<Vec<EchoEvent>, Box<dyn Er
 }
 
 /**
- * For an entire row across all channels, generate the events that apply to the row as a whole. This usually means applying
- * the waits so that the row can be flushed to Echo and played - ESF ticks are until the nearest wait or stop event.
+ * Get the delays due at the end of a row. These delays are what flushes the tick to Echo so that it can play.
  */
-pub fn get_events_for_row( channels: &mut [Channel], subrows: Vec<&PatternRow>, ticks_to_wait: u8 ) -> Result<Vec<EchoEvent>, Box<dyn Error>> {
+fn get_delays( channels: &mut [Channel], ticks_to_wait: u8 ) -> Result<Vec<EchoEvent>, Box<dyn Error>> {
     let mut events: Vec<EchoEvent> = Vec::new();
 
-    // Get events for each subrow (part of the total row for each channel)
-    for i in 0..channels.len() {
-        // Apply effects to channel's current state
-        events.extend( apply_effects_to_channel( &mut channels[ i ], &subrows[ i ].effects )? );
-
-        // Get the ESF events for this channel's part of the row
-        events.extend( get_events_for_channel( &mut channels[ i ], subrows[ i ] )? );
-    }
-
     // All portamento effects deploy per tick, not per row. So we need to aggregate all portamentos across all
     // channels for this row, then flush them once per `ticks_to_wait` for this row.
-    // So let's say portamentos are defined on FM1 and FM5 and ticks_to_wait is 3. The generated events are:
-    // [ freq_shift_fm1, freq_shift_fm5, wait 1 tick, freq_shift_fm1, freq_shift_fm5, wait 1 tick, freq_shift_fm1, freq_shift_fm5, wait 1 tick ]
     let mut active_portamentos: Vec<(usize, Effect)> = Vec::new();
     for channel_id in 0..channels.len() {
         let channel = &channels[ channel_id ];
@@ -464,6 +452,9 @@ pub fn get_events_for_row( channels: &mut [Channel], subrows: Vec<&PatternRow>,
         }
     }
 
+    // Do we have any active portamentos? If so, push them according to the portamento wait pattern.
+    // So let's say portamentos are defined on FM1 and FM5 and ticks_to_wait is 3. The generated events are:
+    // [ freq_shift_fm1, freq_shift_fm5, wait 1 tick, freq_shift_fm1, freq_shift_fm5, wait 1 tick, freq_shift_fm1, freq_shift_fm5, wait 1 tick ]
     if !active_portamentos.is_empty() {
         for _tick in 0..ticks_to_wait {
             for ( channel_id, portamento ) in &active_portamentos {
@@ -479,4 +470,23 @@ pub fn get_events_for_row( channels: &mut [Channel], subrows: Vec<&PatternRow>,
     }
 
     Ok( compact_delays( events )? )
+}
+
+/**
+ * For an entire row across all channels, generate the events that apply to the row as a whole. This usually means applying
+ * the waits so that the row can be flushed to Echo and played - ESF ticks are until the nearest wait or stop event.
+ */
+pub fn get_events_for_row( channels: &mut [Channel], subrows: Vec<&PatternRow>, ticks_to_wait: u8 ) -> Result<Vec<EchoEvent>, Box<dyn Error>> {
+    let mut events: Vec<EchoEvent> = Vec::new();
+
+    // Get events for each subrow (part of the total row for each channel)
+    for i in 0..channels.len() {
+        // Apply effects to channel's current state
+        events.extend( apply_effects_to_channel( &mut channels[ i ], &subrows[ i ].effects )? );
+
+        // Get the ESF events for this channel's part of the row
+        events.extend( get_events_for_channel( &mut channels[ i ], subrows[ i ] )? );
+    }
+
+    Ok( get_delays( channels, ticks_to_wait )? )
 }