stereo ping pong for delay

notes

@@ -33,9 +33,14 @@ parameters {
 TODO {
     settings dialog {
         about-license info
+        
+        probably some audio engine settings {
+            working sample rate
+            buffer sizes and such
+        }
     }
     
-    ping-pong for delay
+    - ping-pong for delay
     
     revert-to-saved menu action
     

xybrid/data/audioframe.h

@@ -47,6 +47,7 @@ namespace Xybrid::Data {
             r *= m;
         }
 
+        inline AudioFrame flip() { return {r, l}; }
         inline AudioFrame clamp(double m = 1.0) { return { std::clamp(l, -m, m), std::clamp(r, -m, m) }; }
 
         static AudioFrame gainBalanceMult(double gain, double balance = 0.0);

xybrid/nodes/effect/delay.cpp

@@ -84,6 +84,7 @@ void Delay::process() {
         if (!buf.areIndexesValid()) buf.normalizeIndexes(); // make sure we can actually reach the point we need
         int i = frames + buf.firstIndex();
         buf[i] += (fCurrent * delayMult) + (fOut * fbMult);
+        if (pingPong) buf[i] = buf[i].flip();
 
         if (oc) (*out)[f] = fCurrent + fOut;
         if (wc) (*wout)[f] = fOut;
@@ -93,6 +94,7 @@ void Delay::process() {
 void Delay::saveData(QCborMap& m) const {
     m[qs("time")] = delayTime;
     m[qs("inBeats")] = timeInBeats;
+    m[qs("pingPong")] = pingPong;
     m[qs("amount")] = amount;
     m[qs("feedback")] = feedback;
 }
@@ -100,6 +102,7 @@ void Delay::saveData(QCborMap& m) const {
 void Delay::loadData(const QCborMap& m) {
     delayTime = m.value("time").toDouble(delayTime);
     timeInBeats = m.value("inBeats").toBool(timeInBeats);
+    pingPong = m.value("pingPong").toBool(pingPong);
     amount = m.value("amount").toDouble(amount);
     feedback = m.value("feedback").toDouble(feedback);
 }
@@ -109,7 +112,9 @@ void Delay::onGadgetCreated() {
     auto l = new LayoutGadget(obj);
 
     (new KnobGadget(l))->bind(delayTime)->setLabel(qs("Time"))->setRange(0.0, 5.0, 0.001)->setDefault(0.5);
-    (new ToggleGadget(l))->bind(timeInBeats)->setColor({191, 127, 255})->setToolTip(qs("BPM-relative"));
+    auto l2 = (new LayoutGadget(l, true))->setMetrics(0, 4);
+    (new ToggleGadget(l2))->bind(timeInBeats)->setColor({191, 127, 255})->setToolTip(qs("BPM-relative"));
+    (new ToggleGadget(l2))->bind(pingPong)->setColor({127, 191, 255})->setToolTip(qs("Stereo ping-pong"));
     //l->addSpacer();
     (new KnobGadget(l))->bind(amount)->setLabel(qs("Level"))->setTextFunc(KnobGadget::textPercent)->setDefault(0.5);
     //l->addSpacer();

xybrid/nodes/effect/delay.h

@@ -12,6 +12,8 @@ namespace Xybrid::Effects {
         double delayTime = 0.5;
         bool timeInBeats = false;
 
+        bool pingPong = false;
+
         double amount = 0.5;
         double feedback = 0.0;