From 3eb0824c6477bc7720b3ed0ac49f58a34cfa0546 Mon Sep 17 00:00:00 2001
From: Grant Shangreaux <grant@unabridgedsoftware.com>
Date: Fri, 17 Dec 2021 20:41:38 -0600
Subject: Add: more detailed Risset's Bell implementation

also hooks duration up to the main synth to control the length of the
Instrument notes that get played, since they aren't subject to the
ADSR envelope
---
 klangfarbrs/src/instrument.rs | 26 +++++++++++++++++++++++++-
 klangfarbrs/src/lib.rs        | 13 +++++++++----
 2 files changed, 34 insertions(+), 5 deletions(-)

(limited to 'klangfarbrs')

diff --git a/klangfarbrs/src/instrument.rs b/klangfarbrs/src/instrument.rs
index bf08fe4..3170464 100644
--- a/klangfarbrs/src/instrument.rs
+++ b/klangfarbrs/src/instrument.rs
@@ -1,4 +1,4 @@
-use super::{ Partial, Sample, Hz, SamplesPerSecond };
+use super::{ Partial, Millisecond, Sample, Hz, SamplesPerSecond };
 
 pub struct Instrument {
     pub partials: Vec<Partial>,
@@ -13,6 +13,28 @@ impl Instrument {
         }
     }
 
+    pub fn bell(base_freq: Hz, duration: Millisecond, sample_rate: SamplesPerSecond) -> Self {
+        let bell_partials = vec![
+            (1.0, 1.0, 0.56, 0.0),
+            (0.67, 0.9, 0.56, 1.0),
+            (1.0, 0.65, 0.82, 0.0),
+            (1.8, 0.55, 0.92, 1.7),
+            (2.67, 0.325, 1.19, 0.0),
+            (1.67, 0.35, 1.7, 0.0),
+            (1.46, 0.25, 2.0, 0.0),
+            (1.33, 0.2, 2.74, 0.0),
+            (1.33, 0.15, 3.0, 0.0),
+            (1.0, 0.1, 3.76, 0.0),
+            (1.33, 0.075, 4.07, 0.0),
+        ];
+
+        Self {
+            partials: bell_partials.iter()
+                .map(|&p| Partial::new(p.0, p.1, p.2, p.3, sample_rate, duration, base_freq))
+                .collect()
+        }
+    }
+
     pub fn sample(&mut self) -> Sample {
         match self.next() {
             Some(s) => { s },
@@ -52,3 +74,5 @@ mod tests {
         assert_eq!(inst.last(), Some(0.0));
     }
 }
+
+// Partial::new(1.0, 1.0, p, 0.0, sample_rate, 2000, base_freq)
diff --git a/klangfarbrs/src/lib.rs b/klangfarbrs/src/lib.rs
index de3322a..aa133e7 100644
--- a/klangfarbrs/src/lib.rs
+++ b/klangfarbrs/src/lib.rs
@@ -82,14 +82,14 @@ impl MonoSynth {
 
         Self {
             osc: Osc::new(freq, sprt),
-            instrument: Instrument::new(freq, vec![0.56, 0.92, 1.19, 1.7, 2.0, 2.74, 3.0, 3.76, 4.07], sprt),
+            instrument: Instrument::bell(freq, 10000, sprt),
             sample_rate: sprt,
             frequency: freq,
             apply_bend: false,
             phasor_bend: Vector2::new(0.0, 0.0),
             play_instrument: false,
             continuous: true,
-            duration: 0,
+            duration: 5000,
             envelope: Envelope::new(30, 500, 0.5, 1000, sprt),
             cutoff: 0.0,
             frequency_modulation: false,
@@ -184,6 +184,11 @@ impl MonoSynth {
         self.fm_depth = fm_depth
     }
 
+    #[export]
+    fn duration(&mut self, _owner: &Node, duration: Millisecond) {
+        self.duration = duration
+    }
+
     #[export]
     fn set_attack(&mut self, _owner: &Node, attack: Millisecond) {
         self.attack = attack
@@ -215,7 +220,7 @@ impl MonoSynth {
     #[export]
     fn trigger(&mut self, _owner: &Node,
     ) {
-        self.instrument = Instrument::new(self.frequency, vec![0.56, 0.92, 1.19, 1.7, 2.0, 2.74, 3.0, 3.76, 4.07], self.sample_rate);
+        self.instrument = Instrument::bell(self.frequency, self.duration, self.sample_rate);
         self.envelope = Envelope::new(self.attack, self.decay, self.sustain, self.release, self.sample_rate);
     }
 
@@ -244,7 +249,7 @@ impl MonoSynth {
             //     self.phasor.phase = next_phase;
             // }
 
-            if !self.continuous {
+            if !self.continuous && !self.play_instrument {
                 sample *= match self.envelope.next() {
                     Some(a) => a,
                     None => 0.0,
-- 
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