First attempt at interpolation

osc/src/message.rs

@@ -21,6 +21,9 @@ pub enum Message {
     MetronomePosition {
         position: f32, // 0.0 - 1.0 position within current beat
     },
+    Tempo {
+        bpm: f32,
+    },
 }
 
 impl Message {
@@ -59,6 +62,9 @@ impl Message {
             Message::MetronomePosition { position } => {
                 state.set_metronome_position(*position);
             }
+            Message::Tempo { bpm } => {
+                state.set_tempo(*bpm);
+            }
         }
     }
 
@@ -117,6 +123,11 @@ impl Message {
                     position: *position,
                 }));
             }
+        } else if addr == "/looper/tempo" {
+            if let Some(rosc::OscType::Float(bpm)) = args.first() {
+                log::trace!("Tempo: bpm={bpm}");
+                return Ok(Some(Message::Tempo { bpm: *bpm }));
+            }
         }
         // Unknown or unsupported message
         Ok(None)
@@ -168,6 +179,14 @@ impl Message {
                     args: vec![rosc::OscType::Float(position)],
                 })
             }
+            Message::Tempo { bpm } => {
+                let address = "/looper/tempo".to_string();
+
+                rosc::OscPacket::Message(rosc::OscMessage {
+                    addr: address,
+                    args: vec![rosc::OscType::Float(bpm)],
+                })
+            }
         }
     }
-}
+}

osc/src/state.rs

@@ -23,10 +23,11 @@ pub struct State {
     pub rows: usize,
     pub metronome_position: f32, // 0.0 - 1.0 position within current beat
     pub metronome_timestamp: std::time::Instant, // When position was last updated
+    pub tempo: f32, // BPM
 }
 
 impl State {
-    pub fn new(columns: usize, rows: usize) -> Self {
+    pub fn new(columns: usize, rows: usize, tempo: f32) -> Self {
         let cells = (0..columns)
             .map(|_| {
                 vec![
@@ -47,6 +48,7 @@ impl State {
             rows,
             metronome_position: 0.0,
             metronome_timestamp: std::time::Instant::now(),
+            tempo,
         }
     }
 
@@ -79,12 +81,18 @@ impl State {
             Message::MetronomePosition { position } => {
                 self.set_metronome_position(*position);
             }
+            Message::Tempo { bpm } => {
+                self.set_tempo(*bpm);
+            }
         }
     }
 
     pub fn create_state_dump(&self) -> Vec<Message> {
         let mut messages = Vec::new();
 
+        // Send tempo
+        messages.push(Message::Tempo { bpm: self.tempo });
+
         // Send current selections
         messages.push(Message::SelectedColumnChanged {
             column: self.selected_column,
@@ -140,4 +148,8 @@ impl State {
         self.metronome_position = position;
         self.metronome_timestamp = std::time::Instant::now();
     }
-}
+
+    pub fn set_tempo(&mut self, bpm: f32) {
+        self.tempo = bpm;
+    }
+}