polyphony checkpoint

src/synth/Synth.cpp

@@ -0,0 +1,87 @@
+
+#include "Synth.hpp"
+
+Synth::Synth(ConfigService* config, LoggerService* logger, ScopeBuffer* scope, NoteQueue* queue) :
+    config_(config), logger_(logger), scope_(scope), noteQueue_(queue) {
+
+    voices_.fill(Voice(config_, logger_));
+
+}
+
+void Synth::handleNoteEvent(const NoteEvent& event) {
+
+    Voice* v = findVoiceByNote(event.note);
+    if(v != nullptr) v->noteOff();
+
+    if(event.type == NoteEventType::NoteOn) {
+
+        v = findFreeVoice();
+        if(v != nullptr) v->noteOn(event.note, event.velocity);
+    }
+    
+}
+
+void Synth::process(float* out, size_t nFrames) {
+
+    NoteEvent noteEvent;
+    while(noteQueue_->pop(noteEvent)) {
+        handleNoteEvent(noteEvent);
+    }
+
+    // size_t lowestVoice = 0;
+    // float lowestFreq = 100000.0f;
+    // for(size_t i = 0; i < voices_.size(); i++) {
+    //     if(!voices_[i].isActive()) continue;
+    //     float currentFreq = voices_[i].frequency();
+    //     if(currentFreq < lowestFreq) {
+    //         lowestVoice = i;
+    //         lowestFreq = currentFreq;
+    //     }
+    // }
+
+    float sampleOut = 0.0f;
+    for(size_t i = 0; i < nFrames; i++) {
+
+        float mix = 0.0f;
+        for(size_t j = 0; j < voices_.size(); j++) {
+            bool temp = false;
+            if(!voices_[j].isActive()) continue;
+            mix += voices_[j].process(temp);
+            // if(j == lowestVoice) triggered = temp;
+        }
+        mix = tanh(mix/4.0f); // prevent clipping
+
+        sampleOut = mix;
+        out[2*i] = sampleOut;
+        out[2*i+1] = sampleOut;
+
+        // if(scope_) scope_->push(sampleOut);
+        // if(triggered && !once) {
+        //     scope_->setTrigger(i);
+        //     once = true;
+        // }
+
+    }
+
+
+}
+
+Voice* Synth::findFreeVoice() {
+
+    for(Voice& v : voices_) {
+        if(!v.isActive()) {
+            return &v;
+        }
+    }
+    return nullptr;
+}
+
+Voice* Synth::findVoiceByNote(uint8_t note) {
+
+    for(Voice& v : voices_) {
+        if(v.isActive() && v.note() == note) {
+            return &v;
+        }
+    }
+    return nullptr;
+}