Generate Analog EQ filter plot on a background thread, and update sub…

…module

modules/CMakeLists.txt

@@ -17,6 +17,7 @@ target_link_libraries(juce_plugin_modules
     PRIVATE
         juce::juce_audio_utils
         juce::juce_dsp
+        chowdsp::chowdsp_logging
         chowdsp::chowdsp_plugin_base
         chowdsp::chowdsp_plugin_state
         chowdsp::chowdsp_plugin_utils

src/dsp/AnalogEQ/PultecEQWDF.cpp

@@ -45,7 +45,7 @@ void PultecEqWDF::setParameters (float treble_boost, float treble_boost_q, float
 
     // see sim/pultec_treble_boost_freq_curve_fit.py
     static constexpr auto A_r = gcem::sqrt (1.0e7f);
-    const auto g_val = chowdsp::Polynomials::estrin<3> ({ -4.96665892e-17f, 1.73050404e-12f, -2.05889893e-08f, 9.75043069e-05f }, treble_boost_freq);
+    const auto g_val = chowdsp::Polynomials::estrin<3> (chowdsp::Polynomial<float, 3> { { -4.96665892e-17f, 1.73050404e-12f, -2.05889893e-08f, 9.75043069e-05f } }, treble_boost_freq);
     const auto treble_boost_cap_val = g_val / A_r;
     const auto treble_boost_ind_val = chowdsp::Power::ipow<2> (A_r) * treble_boost_cap_val;
     C_treble_boost.setCapacitanceValue (treble_boost_cap_val);

src/dsp/Brickwall/BrickwallProcessor.cpp

@@ -7,6 +7,12 @@ void BrickwallProcessor::prepare (const juce::dsp::ProcessSpec& spec)
     filter.prepare (spec);
     filter.setQValue (chowdsp::CoefficientCalculators::butterworthQ<float>);
     postSpectrumAnalyserTask.prepareToPlay (spec.sampleRate, (int) spec.maximumBlockSize, (int) spec.numChannels);
+
+    const auto paddedChannelSize = chowdsp::Math::round_to_next_multiple (static_cast<size_t> (spec.maximumBlockSize),
+                                                                          chowdsp::SIMDUtils::defaultSIMDAlignment);
+    const auto requiredMemoryBytes = paddedChannelSize * sizeof (float) * 3 // per-band smoothed values
+                                     + paddedChannelSize * spec.numChannels * sizeof (float); // per-band fade buffers
+    arena.reset (requiredMemoryBytes + 32);
 }
 
 void BrickwallProcessor::reset()
@@ -20,7 +26,7 @@ void BrickwallProcessor::processBlock (const chowdsp::BufferView<float>& buffer)
 {
     filter.setFilterType (getFilterTypeIndex());
     filter.setCutoffFrequency (*params.cutoff);
-    filter.processBlock (buffer);
+    filter.processBlock (buffer, arena);
 
     if (extraState.isEditorOpen.load() && extraState.showSpectrum.get())
         postSpectrumAnalyserTask.processBlockInput (buffer.toAudioBuffer());

src/dsp/Brickwall/BrickwallProcessor.h

@@ -178,6 +178,8 @@ class BrickwallProcessor
         chowdsp::EllipticFilter<16, chowdsp::EllipticFilterType::Highpass>>;
     EQBand filter;
 
+    chowdsp::ArenaAllocator<> arena;
+
     gui::SpectrumAnalyserTask postSpectrumAnalyserTask;
 
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (BrickwallProcessor)

src/dsp/Waveshaper/SignalSmithWaveshaper.cpp

@@ -41,6 +41,9 @@ static constexpr auto TOL = chowdsp::ScientificRatio<1, -2>::value<double>;
 
 void SignalSmithWaveshaper::prepare (double sample_rate, int block_size, int numChannels)
 {
+    if (sample_rate == 0.0)
+        return;
+
     k_smooth.prepare (sample_rate, block_size);
     k_smooth.setRampLength (0.05);
     M_smooth.prepare (sample_rate, block_size);

src/dsp/Waveshaper/SplineWaveshaper.cpp

@@ -39,7 +39,7 @@ double evaluateSpline (const Spline& spline, double x)
     const auto splineSetIndex = juce::truncatePositiveToUnsignedInt (scaler * x + offset);
 
     const auto& ss = spline[splineSetIndex];
-    return chowdsp::Polynomials::estrin<3> ({ ss.d, ss.c, ss.b, ss.a }, x - ss.x);
+    return chowdsp::Polynomials::estrin<3> (chowdsp::Polynomial<double, 3> { { ss.d, ss.c, ss.b, ss.a } }, x - ss.x);
 }
 
 // ADAA reference: https://www.desmos.com/calculator/o36ytu5rro
@@ -135,7 +135,7 @@ double evaluateSpline (const VectorSpline& spline, double x)
     }
 
     const auto& ss = spline[splineSetIndex];
-    return chowdsp::Polynomials::estrin<3> ({ ss.d, ss.c, ss.b, ss.a }, x - ss.x);
+    return chowdsp::Polynomials::estrin<3> (chowdsp::Polynomial<double, 3> { { ss.d, ss.c, ss.b, ss.a } }, x - ss.x);
 }
 
 double evaluateSplineADAA (const std::vector<SplineADAASection>& spline, double x)

src/gui/AnalogEQ/AnalogEQPlot.cpp

@@ -19,7 +19,9 @@ namespace
     {
         using SpectrumDotSlider::SpectrumDotSlider;
         bool isSelected = false;
-        AnalogEQPlot::BandID bandID = AnalogEQPlot::BandID::None;
+        BandID bandID = BandID::None;
+        juce::dsp::FixedSizeFunction<16, void()> callback;
+
         void paint (juce::Graphics& g) override
         {
             SpectrumDotSlider::paint (g);
@@ -30,6 +32,12 @@ namespace
                 g.drawEllipse (getThumbBounds().expanded (2.0f), 1.0f);
             }
         }
+
+        void mouseDown (const juce::MouseEvent& event) override
+        {
+            callback();
+            SpectrumDotSlider::mouseDown (event);
+        }
     };
 
     template <typename T, typename B, typename... Args>
@@ -40,21 +48,55 @@ namespace
     }
 } // namespace
 
+AnalogEQPlot::BackgroundPlotter::BackgroundPlotter (chowdsp::SpectrumPlotBase& plotBase, juce::Component& parentComponent)
+    : parent (parentComponent),
+      filterPlotter (plotBase, chowdsp::GenericFilterPlotter::Params {
+                                   .sampleRate = sampleRate,
+                                   .freqSmoothOctaves = 1.0f / 12.0f,
+                                   .fftOrder = fftOrder,
+                               })
+{
+}
+
+AnalogEQPlot::BackgroundPlotter::~BackgroundPlotter()
+{
+    sharedTimeSliceThread->removeTimeSliceClient (this);
+    if (sharedTimeSliceThread->getNumClients() == 0)
+        sharedTimeSliceThread->stopThread (-1);
+}
+
+void AnalogEQPlot::BackgroundPlotter::start()
+{
+    useTimeSlice();
+    sharedTimeSliceThread->addTimeSliceClient (this);
+    if (! sharedTimeSliceThread->isThreadRunning())
+        sharedTimeSliceThread->startThread();
+}
+
+int AnalogEQPlot::BackgroundPlotter::useTimeSlice()
+{
+    if (chowdsp::AtomicHelpers::compareNegate (needsUpdate))
+    {
+        filterPlotter.updateFilterPlot();
+
+        juce::MessageManagerLock mml {};
+        parent.repaint();
+    }
+
+    return 30;
+}
+
 AnalogEQPlot::AnalogEQPlot (State& pluginState,
                             dsp::analog_eq::Params& pultecParams,
                             dsp::analog_eq::ExtraState& analogEqExtraState,
                             const chowdsp::HostContextProvider& hcp,
                             SpectrumAnalyserTask::PrePostPair spectrumAnalyserTasks)
     : chowdsp::SpectrumPlotBase (chowdsp::SpectrumPlotParams {
-        .minFrequencyHz = (float) minFrequency,
-        .maxFrequencyHz = (float) maxFrequency,
-        .minMagnitudeDB = -21.0f,
-        .maxMagnitudeDB = 21.0f }),
-      filterPlotter (*this, chowdsp::GenericFilterPlotter::Params {
-                                .sampleRate = sampleRate,
-                                .freqSmoothOctaves = 1.0f / 12.0f,
-                                .fftOrder = fftOrder,
-                            }),
+          .minFrequencyHz = (float) minFrequency,
+          .maxFrequencyHz = (float) maxFrequency,
+          .minMagnitudeDB = -21.0f,
+          .maxMagnitudeDB = 21.0f }),
+      plotter (*this, *this),
       extraState (analogEqExtraState),
       pultecEQ (pultecParams, extraState),
       chyron (pluginState, *pluginState.params.analogEQParams, hcp),
@@ -82,13 +124,14 @@ AnalogEQPlot::AnalogEQPlot (State& pluginState,
     };
 
     pultecEQ.prepare ({ sampleRate, (uint32_t) blockSize, 1 });
-    filterPlotter.runFilterCallback = [this] (const float* input, float* output, int numSamples)
+    plotter.filterPlotter.runFilterCallback = [this] (const float* input, float* output, int numSamples)
     {
         pultecEQ.reset();
         juce::FloatVectorOperations::multiply (output, input, 0.1f, numSamples);
         pultecEQ.processBlock (chowdsp::BufferView<float> { output, numSamples });
         juce::FloatVectorOperations::multiply (output, output, 10.0f, numSamples);
     };
+    plotter.start();
 
     pultecParams.doForAllParameters (
         [this, &pluginState] (juce::RangedAudioParameter& param, size_t)
@@ -103,23 +146,6 @@ AnalogEQPlot::AnalogEQPlot (State& pluginState,
                 };
         });
 
-    callbacks += {
-        pluginState.addParameterListener (*pultecParams.bassFreqParam, chowdsp::ParameterListenerThread::MessageThread, [this]
-                                          { setSelectedBand (BandID::Low); }),
-        pluginState.addParameterListener (*pultecParams.bassBoostParam, chowdsp::ParameterListenerThread::MessageThread, [this]
-                                          { setSelectedBand (BandID::Low); }),
-        pluginState.addParameterListener (*pultecParams.bassCutParam, chowdsp::ParameterListenerThread::MessageThread, [this]
-                                          { setSelectedBand (BandID::Low); }),
-        pluginState.addParameterListener (*pultecParams.trebleCutFreqParam, chowdsp::ParameterListenerThread::MessageThread, [this]
-                                          { setSelectedBand (BandID::High_Cut); }),
-        pluginState.addParameterListener (*pultecParams.trebleCutParam, chowdsp::ParameterListenerThread::MessageThread, [this]
-                                          { setSelectedBand (BandID::High_Cut); }),
-        pluginState.addParameterListener (*pultecParams.trebleBoostFreqParam, chowdsp::ParameterListenerThread::MessageThread, [this]
-                                          { setSelectedBand (BandID::High_Boost); }),
-        pluginState.addParameterListener (*pultecParams.trebleBoostParam, chowdsp::ParameterListenerThread::MessageThread, [this]
-                                          { setSelectedBand (BandID::High_Boost); }),
-    };
-
     plotPainter.painter = [this] (juce::Graphics& g)
     {
         drawMagnitudeLabels (g, *this, { -20.0f, -15.0f, -10.0f, -5.0f, 0.0f, 5.0f, 10.0f, 15.0f, 20.0f });
@@ -129,11 +155,19 @@ AnalogEQPlot::AnalogEQPlot (State& pluginState,
         gui::drawMagnitudeLines (*this, g, { -20.0f, -15.0f, -10.0f, -5.0f, 5.0f, 10.0f, 15.0f, 20.0f }, { 0.0f }, colours::majorLinesColour, colours::minorLinesColour);
 
         g.setColour (juce::Colours::red);
-        g.strokePath (filterPlotter.getPath(), juce::PathStrokeType { 1.5f });
+        const juce::ScopedLock pathLock { plotter.filterPlotter.pathMutex };
+        g.strokePath (plotter.filterPlotter.getPath(), juce::PathStrokeType { 1.5f });
     };
     plotPainter.setInterceptsMouseClicks (false, false);
     addAndMakeVisible (plotPainter);
 
+    const auto setBandID = [this] (SelectableDotSlider& slider, BandID id)
+    {
+        slider.bandID = id;
+        slider.callback = [this, id]
+        { setSelectedBand (id); };
+    };
+
     auto& lfControl = make_unique_component<SelectableDotSlider> (lowFreqControl,
                                                                   *pultecParams.bassFreqParam,
                                                                   pluginState,
@@ -153,7 +187,7 @@ AnalogEQPlot::AnalogEQPlot (State& pluginState,
                                                                   &hcp);
     lbControl.setColour (juce::Slider::thumbColourId, juce::Colours::goldenrod);
     lbControl.widthProportion = thumbSizeFactor;
-    lbControl.bandID = BandID::Low;
+    setBandID (lbControl, BandID::Low);
     lbControl.getXCoordinate = [this, &bassFreqParam = *pultecParams.bassFreqParam]
     {
         return getXCoordinateForFrequency (bassFreqParam.get() * 0.7f);
@@ -168,7 +202,7 @@ AnalogEQPlot::AnalogEQPlot (State& pluginState,
                                                                   &hcp);
     lcControl.setColour (juce::Slider::thumbColourId, juce::Colours::goldenrod);
     lcControl.widthProportion = thumbSizeFactor;
-    lcControl.bandID = BandID::Low;
+    setBandID (lcControl, BandID::Low);
     lcControl.getXCoordinate = [this, &bassFreqParam = *pultecParams.bassFreqParam]
     {
         return getXCoordinateForFrequency (bassFreqParam.get() * 1.0f / 0.7f);
@@ -182,7 +216,7 @@ AnalogEQPlot::AnalogEQPlot (State& pluginState,
                                                                       gui::SpectrumDotSlider::MagnitudeOriented);
     highBoostGain.setColour (juce::Slider::thumbColourId, juce::Colours::teal);
     highBoostGain.widthProportion = thumbSizeFactor;
-    highBoostGain.bandID = BandID::High_Boost;
+    setBandID (highBoostGain, BandID::High_Boost);
     highBoostGain.getXCoordinate = [this, &trebleBoostFreqParam = *pultecParams.trebleBoostFreqParam]
     {
         return getXCoordinateForFrequency (trebleBoostFreqParam.get());
@@ -196,7 +230,7 @@ AnalogEQPlot::AnalogEQPlot (State& pluginState,
                                                                       gui::SpectrumDotSlider::FrequencyOriented);
     highBoostFreq.setColour (juce::Slider::thumbColourId, juce::Colours::teal);
     highBoostFreq.widthProportion = thumbSizeFactor;
-    highBoostFreq.bandID = BandID::High_Boost;
+    setBandID (highBoostFreq, BandID::High_Boost);
     highBoostFreq.getYCoordinate = [this, &trebleBoostParam = *pultecParams.trebleBoostParam]
     {
         return getYCoordinateForDecibels (trebleBoostParam.get());
@@ -215,7 +249,7 @@ AnalogEQPlot::AnalogEQPlot (State& pluginState,
                                                                     gui::SpectrumDotSlider::MagnitudeOriented);
     highCutGain.setColour (juce::Slider::thumbColourId, juce::Colours::limegreen);
     highCutGain.widthProportion = thumbSizeFactor;
-    highCutGain.bandID = BandID::High_Cut;
+    setBandID (highCutGain, BandID::High_Cut);
     highCutGain.getXCoordinate = [this, &trebleCutFreqParam = *pultecParams.trebleCutFreqParam]
     {
         return getXCoordinateForFrequency (trebleCutFreqParam.get());
@@ -229,7 +263,7 @@ AnalogEQPlot::AnalogEQPlot (State& pluginState,
                                                                     gui::SpectrumDotSlider::FrequencyOriented);
     highCutFreq.setColour (juce::Slider::thumbColourId, juce::Colours::limegreen);
     highCutFreq.widthProportion = thumbSizeFactor;
-    highCutFreq.bandID = BandID::High_Cut;
+    setBandID (highCutFreq, BandID::High_Cut);
     highCutFreq.getYCoordinate = [this, &trebleCutParam = *pultecParams.trebleCutParam]
     {
         return getYCoordinateForDecibels (trebleCutParam.get());
@@ -256,12 +290,12 @@ AnalogEQPlot::~AnalogEQPlot()
 
 void AnalogEQPlot::updatePlot()
 {
-    filterPlotter.updateFilterPlot();
-    repaint();
+    plotter.needsUpdate.store (true, std::memory_order_release);
 }
 
 void AnalogEQPlot::setSelectedBand (BandID band)
 {
+    chyron.setSelectedBand (band);
     for (juce::Slider* slider : { lowFreqControl.get(),
                                   lowBoostControl.get(),
                                   lowCutControl.get(),
@@ -299,7 +333,7 @@ void AnalogEQPlot::resized()
 
 void AnalogEQPlot::mouseDown (const juce::MouseEvent& event)
 {
-    chyron.setSelectedBand (EQBand::None);
+    setSelectedBand (BandID::None);
     if (event.mods.isPopupMenu())
     {
         chowdsp::SharedLNFAllocator lnfAllocator;

src/gui/AnalogEQ/AnalogEQPlot.h

@@ -9,6 +9,14 @@ namespace gui::analog_eq
 {
 class DotSlider;
 
+enum class BandID
+{
+    None,
+    Low,
+    High_Cut,
+    High_Boost,
+};
+
 class AnalogEQPlot : public chowdsp::SpectrumPlotBase
 {
 public:
@@ -21,21 +29,25 @@ class AnalogEQPlot : public chowdsp::SpectrumPlotBase
 
     void resized() override;
 
-    enum class BandID
-    {
-        None,
-        Low,
-        High_Cut,
-        High_Boost,
-    };
-
 private:
     void mouseDown (const juce::MouseEvent& event) override;
 
     void updatePlot();
     void setSelectedBand (BandID bandID);
 
-    chowdsp::GenericFilterPlotter filterPlotter;
+    struct BackgroundPlotter : juce::TimeSliceClient
+    {
+        BackgroundPlotter (chowdsp::SpectrumPlotBase& plotBase, juce::Component& parent);
+        ~BackgroundPlotter() override;
+        void start();
+        int useTimeSlice() override;
+
+        std::atomic_bool needsUpdate { true };
+        juce::Component& parent;
+        chowdsp::GenericFilterPlotter filterPlotter;
+        juce::SharedResourcePointer<chowdsp::detail::TimeSliceBackgroundTask::TimeSliceThread> sharedTimeSliceThread;
+    } plotter;
+
     dsp::analog_eq::ExtraState& extraState;
     dsp::analog_eq::AnalogEQProcessor pultecEQ;