Add the polyphony parameter

vst/SfizzVstController.cpp

@@ -22,6 +22,10 @@ tresult PLUGIN_API SfizzVstControllerNoUi::initialize(FUnknown* context)
         kParamVolumeRange.createParameter(
             Steinberg::String("Volume"), pid++, Steinberg::String("dB"),
             0, Vst::ParameterInfo::kCanAutomate, Vst::kRootUnitId));
+    parameters.addParameter(
+        kParamNumVoicesRange.createParameter(
+            Steinberg::String("Polyphony"), pid++, nullptr,
+            0, Vst::ParameterInfo::kNoFlags, Vst::kRootUnitId));
 
     // MIDI controllers
     for (unsigned i = 0; i < kNumControllerParams; ++i) {
@@ -85,19 +89,35 @@ tresult PLUGIN_API SfizzVstController::setParamNormalized(Vst::ParamID tag, Vst:
     if (r != kResultTrue)
         return r;
 
-    float *slot = nullptr;
+    float *slotF32 = nullptr;
+    int32 *slotI32 = nullptr;
     float value = 0;
 
     switch (tag) {
     case kPidVolume: {
-        slot = &_state.volume;
+        slotF32 = &_state.volume;
         value = kParamVolumeRange.denormalize(normValue);
         break;
     }
+    case kPidNumVoices: {
+        slotI32 = &_state.numVoices;
+        value = kParamNumVoicesRange.denormalize(normValue);
+        break;
+    }
     }
 
-    if (slot && *slot != value) {
-        *slot = value;
+    bool update = false;
+
+    if (slotF32 && *slotF32 != value) {
+        *slotF32 = value;
+        update = true;
+    }
+    else if (slotI32 && *slotI32 != (int32)value) {
+        *slotI32 = (int32)value;
+        update = true;
+    }
+
+    if (update) {
         for (StateListener* listener : _stateListeners)
             listener->onStateChanged();
     }
@@ -137,6 +157,7 @@ tresult PLUGIN_API SfizzVstController::setComponentState(IBStream* state)
     _state = s;
 
     setParamNormalized(kPidVolume, kParamVolumeRange.normalize(s.volume));
+    setParamNormalized(kPidNumVoices, kParamNumVoicesRange.normalize(s.numVoices));
 
     for (StateListener* listener : _stateListeners)
         listener->onStateChanged();

vst/SfizzVstEditor.cpp

@@ -76,6 +76,11 @@ void SfizzVstEditor::valueChanged(CControl* ctl)
         controller->performEdit(kPidVolume, valueNorm);
         break;
 
+    case kTagSetNumVoices:
+        controller->setParamNormalized(kPidNumVoices, valueNorm);
+        controller->performEdit(kPidNumVoices, valueNorm);
+        break;
+
     default:
         if (tag >= kTagFirstChangePanel && tag <= kTagLastChangePanel)
             setActivePanel(tag - kTagFirstChangePanel);
@@ -90,6 +95,7 @@ void SfizzVstEditor::enterOrLeaveEdit(CControl* ctl, bool enter)
 
     switch (tag) {
     case kTagSetVolume: id = kPidVolume; break;
+    case kTagSetNumVoices: id = kPidNumVoices; break;
     default: return;
     }
 
@@ -231,21 +237,23 @@ void SfizzVstEditor::createFrameContents()
         label->setHoriAlign(kLeftText);
         panel->addView(label);
         slider = new SimpleSlider(rightSide(), this, kTagSetVolume);
-        adjustMinMaxToRangeParam(slider, kPidVolume);
         panel->addView(slider);
+        adjustMinMaxToRangeParam(slider, kPidVolume);
         _volumeSlider = slider;
 
-        // row.top += interRow;
-        // row.bottom += interRow;
+        row.top += interRow;
+        row.bottom += interRow;
 
-        // label = new CTextLabel(leftSide(), "Polyphony");
-        // label->setFontColor(CColor(0x00, 0x00, 0x00));
-        // label->setFrameColor(CColor(0x00, 0x00, 0x00, 0x00));
-        // label->setBackColor(CColor(0x00, 0x00, 0x00, 0x00));
-        // label->setHoriAlign(kLeftText);
-        // panel->addView(label);
-        // slider = new SimpleSlider(rightSide(), this, -1);
-        // panel->addView(slider);
+        label = new CTextLabel(leftSide(), "Polyphony");
+        label->setFontColor(CColor(0x00, 0x00, 0x00));
+        label->setFrameColor(CColor(0x00, 0x00, 0x00, 0x00));
+        label->setBackColor(CColor(0x00, 0x00, 0x00, 0x00));
+        label->setHoriAlign(kLeftText);
+        panel->addView(label);
+        slider = new SimpleSlider(rightSide(), this, kTagSetNumVoices);
+        panel->addView(slider);
+        adjustMinMaxToRangeParam(slider, kPidNumVoices);
+        _numVoicesSlider = slider;
 
         // row.top += interRow;
         // row.bottom += interRow;
@@ -331,6 +339,8 @@ void SfizzVstEditor::updateStateDisplay()
         _fileLabel->setText(("File: " + state.sfzFile).c_str());
     if (_volumeSlider)
         _volumeSlider->setValue(state.volume);
+    if (_numVoicesSlider)
+        _numVoicesSlider->setValue(state.numVoices);
 
     setActivePanel(uiState.activePanel);
 }

vst/SfizzVstEditor.h

@@ -62,6 +62,7 @@ private:
     enum {
         kTagLoadSfzFile,
         kTagSetVolume,
+        kTagSetNumVoices,
         kTagFirstChangePanel,
         kTagLastChangePanel = kTagFirstChangePanel + kNumPanels - 1,
     };
@@ -69,4 +70,5 @@ private:
     CBitmap _logo;
     CTextLabel* _fileLabel = nullptr;
     CSliderBase *_volumeSlider = nullptr;
+    CSliderBase *_numVoicesSlider = nullptr;
 };

vst/SfizzVstProcessor.cpp

@@ -80,6 +80,7 @@ void SfizzVstProcessor::syncStateToSynth()
 
     synth->loadSfzFile(_state.sfzFile);
     synth->setVolume(_state.volume);
+    synth->setNumVoices(_state.numVoices);
 }
 
 tresult PLUGIN_API SfizzVstProcessor::canProcessSampleSize(int32 symbolicSampleSize)
@@ -173,6 +174,21 @@ void SfizzVstProcessor::processParameterChanges(Vst::IParameterChanges& pc)
             if (pointCount > 0 && vq->getPoint(pointCount - 1, sampleOffset, value) == kResultTrue)
                 _state.volume = kParamVolumeRange.denormalize(value);
             break;
+        case kPidNumVoices:
+            if (pointCount > 0 && vq->getPoint(pointCount - 1, sampleOffset, value) == kResultTrue) {
+                Vst::IMessage* msg = allocateMessage();
+                if (!msg)
+                    break;
+                msg->setMessageID("SetNumVoices");
+                Vst::IAttributeList* attr = msg->getAttributes();
+                attr->setInt("NumVoices", kParamNumVoicesRange.denormalize(value));
+                if (!_fifoToWorker.push(msg)) {
+                    msg->release();
+                    break;
+                }
+                _semaToWorker.post();
+            }
+            break;
         }
     }
 }
@@ -296,6 +312,13 @@ void SfizzVstProcessor::doBackgroundWork()
                 _synth->loadSfzFile(_state.sfzFile);
             }
         }
+        else if (!std::strcmp(id, "SetNumVoices")) {
+            int64 value;
+            if (attr->getInt("NumVoices", value) == kResultTrue) {
+                _state.numVoices = value;
+                _synth->setNumVoices(value);
+            }
+        }
 
         msg->release();
     }

vst/SfizzVstState.cpp

@@ -24,6 +24,9 @@ tresult SfizzVstState::load(IBStream* state)
     if (!s.readFloat(volume))
         return kResultFalse;
 
+    if (!s.readInt32(numVoices))
+        return kResultFalse;
+
     return kResultTrue;
 }
 
@@ -40,6 +43,9 @@ tresult SfizzVstState::store(IBStream* state) const
     if (!s.writeFloat(volume))
         return kResultFalse;
 
+    if (!s.writeInt32(numVoices))
+        return kResultFalse;
+
     return kResultTrue;
 }
 

vst/SfizzVstState.h

@@ -19,6 +19,7 @@ enum {
 // parameters
 enum {
     kPidVolume,
+    kPidNumVoices,
     kPidMidiCC0,
     kPidMidiCCLast = kPidMidiCC0 + kNumControllerParams - 1,
     kPidMidiAftertouch,
@@ -30,6 +31,7 @@ class SfizzVstState {
 public:
     std::string sfzFile;
     float volume = 0;
+    int numVoices = 64;
 
     static constexpr uint64 currentStateVersion = 0;
 
@@ -72,3 +74,4 @@ struct SfizzParameterRange {
 };
 
 static constexpr SfizzParameterRange kParamVolumeRange(0.0, -60.0, +6.0);
+static constexpr SfizzParameterRange kParamNumVoicesRange(64.0, 1.0, 256.0);