Some splitting of code

Source/SynthVoice/Distortion.h

@@ -0,0 +1,54 @@
+#pragma once
+#include "../SynthVoice.h"
+
+void NeuralSynthVoice::renderDistortion(
+    int numSamples,
+    int numCh,
+    juce::dsp::AudioBlock<float> &block) {
+// ================================================================
+// Distortion + tone (post LPF/Peak)
+// ================================================================
+    const float driveDb = shared.distortionDrive ? shared.distortionDrive->load() : 0.0f;
+    const float bias    = juce::jlimit (-1.0f, 1.0f,  shared.distortionBias ? shared.distortionBias->load() : 0.0f);
+    const float toneHz  = juce::jlimit (100.0f, 8000.0f, shared.distortionTone ? shared.distortionTone->load() : 3000.0f);
+    const int   shape   = (int) std::lround (juce::jlimit (0.0f, 2.0f,
+                            shared.distortionShape ? shared.distortionShape->load() : 0.0f));
+    const float mix     = shared.distortionMix ? shared.distortionMix->load() : 0.0f;
+
+    auto& pre  = chain.get<distortionPreGain>();
+    auto& sh   = chain.get<distortionIndex>();
+    auto& tone = chain.get<distortionPostLPF>();
+
+    pre.setGainDecibels (driveDb);
+
+    // Explicit std::function target (works on MSVC)
+    if (shape == 0)      sh.functionToUse = std::function<float(float)>{ [bias](float x) noexcept { return std::tanh (x + bias); } };
+    else if (shape == 1) sh.functionToUse = std::function<float(float)>{ [bias](float x) noexcept { return juce::jlimit (-1.0f, 1.0f, x + bias); } };
+    else                 sh.functionToUse = std::function<float(float)>{ [bias](float x) noexcept { return std::atan (x + bias) * (2.0f / juce::MathConstants<float>::pi); } };
+
+    tone.coefficients = juce::dsp::IIR::Coefficients<float>::makePeakFilter (
+        spec.sampleRate, toneHz, 0.707f,
+        juce::Decibels::decibelsToGain (shared.highGainDbls ? shared.highGainDbls->load() : 0.0f));
+
+    if (shared.distortionOn && shared.distortionOn->load() > 0.5f)
+    {
+        // Wet/dry blend around the shaper
+        juce::AudioBuffer<float> dryCopy (tempBuffer.getNumChannels(), numSamples);
+        for (int ch = 0; ch < numCh; ++ch)
+            dryCopy.copyFrom (ch, 0, tempBuffer, ch, 0, numSamples);
+
+        // pre -> shaper -> tone
+        pre.process  (juce::dsp::ProcessContextReplacing<float> (block));
+        sh.process   (juce::dsp::ProcessContextReplacing<float> (block));
+        tone.process (juce::dsp::ProcessContextReplacing<float> (block));
+
+        const float wet = mix, dry = 1.0f - mix;
+        for (int ch = 0; ch < numCh; ++ch)
+        {
+            auto* d = dryCopy.getReadPointer (ch);
+            auto* w = tempBuffer.getWritePointer (ch);
+            for (int i = 0; i < numSamples; ++i)
+                w[i] = dry * d[i] + wet * w[i];
+        }
+    }
+}