From 623bf9336865de8ff68bc8d2387a67e2ee412e6e Mon Sep 17 00:00:00 2001
From: Felix Roos <flix91@gmail.com>
Date: Fri, 6 Jun 2025 08:50:02 +0200
Subject: [PATCH] panning

---
 packages/superdough/dough.mjs    | 25 +++++++++++++++++++------
 packages/superdough/worklets.mjs |  4 ++--
 2 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/packages/superdough/dough.mjs b/packages/superdough/dough.mjs
index bd226cc72..e6190f140 100644
--- a/packages/superdough/dough.mjs
+++ b/packages/superdough/dough.mjs
@@ -370,6 +370,7 @@ const defaultDefaultValues = {
   velocity: 1,
   fft: 8,
   z: 'triangle',
+  pan: 0.5,
 };
 
 let getDefaultValue = (key) => defaultDefaultValues[key];
@@ -402,6 +403,8 @@ const getFrequency = (value) => {
 };
 
 export class DoughVoice {
+  l = 0;
+  r = 0;
   constructor(value) {
     // params without defaults:
     /*
@@ -464,6 +467,7 @@ export class DoughVoice {
     this.i = this.i ?? getDefaultValue('i');
     this.velocity = this.velocity ?? getDefaultValue('velocity');
     this.fft = this.fft ?? getDefaultValue('fft');
+    this.pan = this.pan ?? getDefaultValue('pan');
 
     [this.attack, this.decay, this.sustain, this.release] = getADSRValues([
       this.attack,
@@ -517,7 +521,15 @@ export class DoughVoice {
     s = s * env;
 
     s = s * this.postgain * 0.2;
-    return s;
+
+    if (this.pan === 0.5) {
+      this.l = this.r = s; // mono
+    } else {
+      // stereo
+      const pos = (this.pan * Math.PI) / 2;
+      this.l = s * Math.cos(pos);
+      this.r = s * Math.sin(pos);
+    }
   }
 }
 
@@ -527,8 +539,7 @@ export class Dough {
   voices = []; // DoughVoice[]
   vid = 0;
   q = [];
-  l = 0; // tbd
-  r = 0; // tbd
+  channels = [0, 0];
   t = 0;
   // sampleRate: number, currentTime: number (seconds)
   constructor(sampleRate = 48000, currentTime = 0) {
@@ -588,11 +599,13 @@ export class Dough {
       this.q.shift();
     }
     // add active voices
-    let sum = 0;
+    this.channels[0] = 0;
+    this.channels[1] = 0;
     for (let v = 0; v < this.voices.length; v++) {
-      sum += this.voices[v].update(this.t / this.sampleRate);
+      this.voices[v].update(this.t / this.sampleRate);
+      this.channels[0] += this.voices[v].l;
+      this.channels[1] += this.voices[v].r;
     }
     this.t++;
-    return sum;
   }
 }
diff --git a/packages/superdough/worklets.mjs b/packages/superdough/worklets.mjs
index 2edcc6f53..d8f189779 100644
--- a/packages/superdough/worklets.mjs
+++ b/packages/superdough/worklets.mjs
@@ -909,10 +909,10 @@ class DoughProcessor extends AudioWorkletProcessor {
     }
     const output = outputs[0];
     for (let i = 0; i < output[0].length; i++) {
-      const out = this.dough.update();
+      this.dough.update();
       for (let c = 0; c < output.length; c++) {
         //prevent speaker blowout via clipping if threshold exceeds
-        output[c][i] = clamp(out, -1, 1);
+        output[c][i] = clamp(this.dough.channels[c], -1, 1);
       }
     }
     return true; // keep the audio processing going