Compact sequences of delays globally instead of locally per row

src/reskit/soundtrack/engines/echo.rs

@@ -385,7 +385,7 @@ fn apply_effects_to_channel( channel: &mut Channel, effects: &LinkedHashSet<Effe
 /**
  * Replace concurrent sequences of waits with single larger waits. This reduces the ESF stream size.
  */
-fn compact_delays( events: Vec<EchoEvent> ) -> Result<Vec<EchoEvent>, Box<dyn Error>> {
+pub fn compact_delays( events: Vec<EchoEvent> ) -> Result<Vec<EchoEvent>, Box<dyn Error>> {
     let mut new_events: Vec<EchoEvent> = Vec::new();
 
     let mut current_sequence: Vec<EchoEvent> = Vec::new();
@@ -435,8 +435,8 @@ fn compact_delays( events: Vec<EchoEvent> ) -> Result<Vec<EchoEvent>, Box<dyn Er
 /**
  * Get the delays due at the end of a row. These delays are what flushes the tick to Echo so that it can play.
  */
-fn get_delays( channels: &mut [Channel], ticks_to_wait: u8 ) -> Result<Vec<EchoEvent>, Box<dyn Error>> {
-    let mut events: Vec<EchoEvent> = Vec::new();
+fn get_delays( events: Vec<EchoEvent>, channels: &mut [Channel], ticks_to_wait: u8 ) -> Result<Vec<EchoEvent>, Box<dyn Error>> {
+    let mut events: Vec<EchoEvent> = events;
 
     // 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.
@@ -469,7 +469,7 @@ fn get_delays( channels: &mut [Channel], ticks_to_wait: u8 ) -> Result<Vec<EchoE
         events.push( get_delay( ticks_to_wait )? );
     }
 
-    Ok( compact_delays( events )? )
+    Ok( events )
 }
 
 /**
@@ -488,5 +488,5 @@ pub fn get_events_for_row( channels: &mut [Channel], subrows: Vec<&PatternRow>,
         events.extend( get_events_for_channel( &mut channels[ i ], subrows[ i ] )? );
     }
 
-    Ok( get_delays( channels, ticks_to_wait )? )
+    Ok( get_delays( events, channels, ticks_to_wait )? )
 }

src/reskit/soundtrack/formats/dmf.rs

@@ -3,7 +3,7 @@ use flate2::read::ZlibDecoder;
 use linked_hash_set::LinkedHashSet;
 use samplerate::convert;
 use uuid::Uuid;
-use crate::reskit::{utility::{get_string, get_u8, skip, get_u32, get_i8, get_i32, get_u16, get_i16, Ring, print_warning, print_info}, soundtrack::{types::{SampleFormat, PsgEnvelope, Note, Sample, PsgSettings, PatternRow, Effect, DcsgChannelMode, NoiseType, Channel}, engines::echo::{EchoFormat, EchoEvent, ESF_FM_1, ESF_FM_2, ESF_FM_3, ESF_FM_4, ESF_FM_5, ESF_PSG_1, ESF_FM_6, ESF_PSG_2, ESF_PSG_3, ESF_PSG_4, get_events_for_row}}};
+use crate::reskit::{utility::{get_string, get_u8, skip, get_u32, get_i8, get_i32, get_u16, get_i16, Ring, print_warning, print_info}, soundtrack::{types::{SampleFormat, PsgEnvelope, Note, Sample, PsgSettings, PatternRow, Effect, DcsgChannelMode, NoiseType, Channel}, engines::echo::{EchoFormat, EchoEvent, ESF_FM_1, ESF_FM_2, ESF_FM_3, ESF_FM_4, ESF_FM_5, ESF_PSG_1, ESF_FM_6, ESF_PSG_2, ESF_PSG_3, ESF_PSG_4, get_events_for_row, compact_delays}}};
 
 const DMF_MAGIC_NUMBER: &'static str = ".DelekDefleMask.";
 const DMF_SUPPORTED_VERSION: u8 = 27;
@@ -942,6 +942,7 @@ impl EchoFormat for DmfModule {
 
         // Iterate for each row, for each channel
         // Recall items are stored as self.channel_patterns[ channel ][ row_number ]
+        let mut all_events: Vec<EchoEvent> = Vec::new();
         for row_number in 0..self.rows_per_pattern {
             let events_this_row: Vec<EchoEvent> = get_events_for_row(
                 &mut channels,
@@ -961,9 +962,13 @@ impl EchoFormat for DmfModule {
             )?;
 
             // Transfer ESF events to the main stream
-            for event in events_this_row {
-                esf.extend( event );
+            all_events.extend( events_this_row );
         }
+
+        // Compact sequences of delays to save rom space
+        let all_events = compact_delays( all_events )?;
+        for event in all_events {
+            esf.extend( event );
         }
 
         Ok( esf )