git subrepo clone --branch=sono6good https://github.com/essej/JUCE.git deps/juce

subrepo:
  subdir:   "deps/juce"
  merged:   "b13f9084e"
upstream:
  origin:   "https://github.com/essej/JUCE.git"
  branch:   "sono6good"
  commit:   "b13f9084e"
git-subrepo:
  version:  "0.4.3"
  origin:   "https://github.com/ingydotnet/git-subrepo.git"
  commit:   "2f68596"

deps/juce/modules/juce_dsp/widgets/juce_Bias.h

@@ -0,0 +1,159 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2020 - Raw Material Software Limited
+
+   JUCE is an open source library subject to commercial or open-source
+   licensing.
+
+   By using JUCE, you agree to the terms of both the JUCE 6 End-User License
+   Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
+
+   End User License Agreement: www.juce.com/juce-6-licence
+   Privacy Policy: www.juce.com/juce-privacy-policy
+
+   Or: You may also use this code under the terms of the GPL v3 (see
+   www.gnu.org/licenses).
+
+   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
+{
+
+/**
+    Adds a DC offset (voltage bias) to the audio samples.
+
+    This is a useful preprocessor for asymmetric waveshaping when a waveshaper is
+    bookended by a bias on input and a DC-offset removing high pass filter on output.
+
+    This is an extremely simple bias implementation that simply adds a value to a signal.
+    More complicated bias behaviours exist in real circuits - for your homework ;).
+
+    @tags{DSP}
+*/
+template <typename FloatType>
+class Bias
+{
+public:
+    Bias() noexcept = default;
+
+    //==============================================================================
+    /** Sets the DC bias
+        @param newBias DC offset in range [-1, 1]
+    */
+    void setBias (FloatType newBias) noexcept
+    {
+        jassert (newBias >= static_cast<FloatType> (-1) && newBias <= static_cast<FloatType> (1));
+        bias.setTargetValue (newBias);
+    }
+
+    //==============================================================================
+    /** Returns the DC bias
+        @return DC bias, which should be in the range [-1, 1]
+    */
+    FloatType getBias() const noexcept              { return bias.getTargetValue(); }
+
+    /** Sets the length of the ramp used for smoothing gain changes. */
+    void setRampDurationSeconds (double newDurationSeconds) noexcept
+    {
+        if (rampDurationSeconds != newDurationSeconds)
+        {
+            rampDurationSeconds = newDurationSeconds;
+            updateRamp();
+        }
+    }
+
+    double getRampDurationSeconds() const noexcept  { return rampDurationSeconds; }
+
+    //==============================================================================
+    /** Called before processing starts */
+    void prepare (const ProcessSpec& spec) noexcept
+    {
+        sampleRate = spec.sampleRate;
+        updateRamp();
+    }
+
+    void reset() noexcept
+    {
+        bias.reset (sampleRate, rampDurationSeconds);
+    }
+
+    //==============================================================================
+    /** Returns the result of processing a single sample. */
+    template <typename SampleType>
+    SampleType processSample (SampleType inputSample) noexcept
+    {
+        return inputSample + bias.getNextValue();
+    }
+
+    //==============================================================================
+    /** Processes the input and output buffers supplied in the processing context. */
+    template <typename ProcessContext>
+    void process (const ProcessContext& context) noexcept
+    {
+        auto&& inBlock  = context.getInputBlock();
+        auto&& outBlock = context.getOutputBlock();
+
+        jassert (inBlock.getNumChannels() == outBlock.getNumChannels());
+        jassert (inBlock.getNumSamples()  == outBlock.getNumSamples());
+
+        auto len         = inBlock.getNumSamples();
+        auto numChannels = inBlock.getNumChannels();
+
+        if (context.isBypassed)
+        {
+            bias.skip (static_cast<int> (len));
+
+            if (context.usesSeparateInputAndOutputBlocks())
+                outBlock.copyFrom (inBlock);
+
+            return;
+        }
+
+        if (numChannels == 1)
+        {
+            auto* src = inBlock.getChannelPointer (0);
+            auto* dst = outBlock.getChannelPointer (0);
+
+            for (size_t i = 0; i < len; ++i)
+                dst[i] = src[i] + bias.getNextValue();
+        }
+        else
+        {
+            JUCE_BEGIN_IGNORE_WARNINGS_MSVC (6255 6386)
+            auto* biases = static_cast<FloatType*> (alloca (sizeof (FloatType) * len));
+
+            for (size_t i = 0; i < len; ++i)
+                biases[i] = bias.getNextValue();
+
+            for (size_t chan = 0; chan < numChannels; ++chan)
+                FloatVectorOperations::add (outBlock.getChannelPointer (chan),
+                                            inBlock.getChannelPointer (chan),
+                                            biases, static_cast<int> (len));
+            JUCE_END_IGNORE_WARNINGS_MSVC
+        }
+    }
+
+
+private:
+    //==============================================================================
+    SmoothedValue<FloatType> bias;
+    double sampleRate = 0, rampDurationSeconds = 0;
+
+    void updateRamp() noexcept
+    {
+        if (sampleRate > 0)
+            bias.reset (sampleRate, rampDurationSeconds);
+    }
+};
+
+} // namespace dsp
+} // namespace juce