DSP: Revamp DSP module

modules/juce_dsp/widgets/juce_Chorus.cpp

@@ -0,0 +1,131 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE 6 technical preview.
+   Copyright (c) 2020 - Raw Material Software Limited
+
+   You may use this code under the terms of the GPL v3
+   (see www.gnu.org/licenses).
+
+   For this technical preview, this file is not subject to commercial licensing.
+
+   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
+   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
+   DISCLAIMED.
+
+  ==============================================================================
+*/
+
+namespace juce
+{
+namespace dsp
+{
+
+//==============================================================================
+template <typename SampleType>
+Chorus<SampleType>::Chorus()
+{
+    auto oscFunction = [] (SampleType x) { return std::sin (x); };
+    osc.initialise (oscFunction);
+
+    dryWet.setMixingRule (DryWetMixingRule::linear);
+}
+
+template <typename SampleType>
+void Chorus<SampleType>::setRate (SampleType newRateHz)
+{
+    jassert (isPositiveAndBelow (newRateHz, static_cast<SampleType> (100.0)));
+
+    rate = newRateHz;
+    update();
+}
+
+template <typename SampleType>
+void Chorus<SampleType>::setDepth (SampleType newDepth)
+{
+    jassert (isPositiveAndNotGreaterThan (newDepth, static_cast<SampleType> (1.0)));
+
+    depth = newDepth;
+    update();
+}
+
+template <typename SampleType>
+void Chorus<SampleType>::setCentreDelay (SampleType newDelayMs)
+{
+    jassert (isPositiveAndBelow (newDelayMs, static_cast<SampleType> (100.0)));
+
+    centreDelay = jlimit (static_cast<SampleType> (1.0), static_cast<SampleType> (100.0), newDelayMs);
+}
+
+template <typename SampleType>
+void Chorus<SampleType>::setFeedback (SampleType newFeedback)
+{
+    jassert (newFeedback >= static_cast<SampleType> (-1.0) && newFeedback <= static_cast<SampleType> (1.0));
+
+    feedback = newFeedback;
+    update();
+}
+
+template <typename SampleType>
+void Chorus<SampleType>::setMix (SampleType newMix)
+{
+    jassert (isPositiveAndNotGreaterThan (newMix, static_cast<SampleType> (1.0)));
+
+    mix = newMix;
+    update();
+}
+
+//==============================================================================
+template <typename SampleType>
+void Chorus<SampleType>::prepare (const ProcessSpec& spec)
+{
+    jassert (spec.sampleRate > 0);
+    jassert (spec.numChannels > 0);
+
+    sampleRate = spec.sampleRate;
+
+    delay.prepare (spec);
+
+    dryWet.prepare (spec);
+    feedbackVolume.resize (spec.numChannels);
+    lastOutput.resize (spec.numChannels);
+
+    osc.prepare (spec);
+    bufferDelayTimes.setSize (1, (int) spec.maximumBlockSize, false, false, true);
+
+    update();
+    reset();
+}
+
+template <typename SampleType>
+void Chorus<SampleType>::reset()
+{
+    std::fill (lastOutput.begin(), lastOutput.end(), static_cast<SampleType> (0));
+
+    delay.reset();
+    osc.reset();
+    dryWet.reset();
+
+    oscVolume.reset (sampleRate, 0.05);
+
+    for (auto& vol : feedbackVolume)
+        vol.reset (sampleRate, 0.05);
+}
+
+template <typename SampleType>
+void Chorus<SampleType>::update()
+{
+    osc.setFrequency (rate);
+    oscVolume.setTargetValue (depth * (SampleType) 0.5);
+    dryWet.setWetMixProportion (mix);
+
+    for (auto& vol : feedbackVolume)
+        vol.setTargetValue (feedback);
+}
+
+//==============================================================================
+template class Chorus<float>;
+template class Chorus<double>;
+
+} // namespace dsp
+} // namespace juce