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/processors/juce_Panner.h

@@ -0,0 +1,121 @@
+/*
+  ==============================================================================
+
+   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
+{
+
+enum class PannerRule
+{
+    linear,          // regular 6 dB or linear panning rule, allows the panned sound to be
+                     // perceived as having a constant level when summed to mono
+    balanced,        // both left and right are 1 when pan value is 0, with left decreasing
+                     // to 0 above this value and right decreasing to 0 below it
+    sin3dB,          // alternate version of the regular 3 dB panning rule with a sine curve
+    sin4p5dB,        // alternate version of the regular 4.5 dB panning rule with a sine curve
+    sin6dB,          // alternate version of the regular 6 dB panning rule with a sine curve
+    squareRoot3dB,   // regular 3 dB or constant power panning rule, allows the panned sound
+                     // to be perceived as having a constant level regardless of the pan position
+    squareRoot4p5dB  // regular 4.5 dB panning rule, a compromise option between 3 dB and 6 dB panning rules
+};
+
+/**
+    A processor to perform panning operations on stereo buffers.
+
+    @tags{DSP}
+*/
+template <typename SampleType>
+class Panner
+{
+public:
+    //==============================================================================
+    using Rule = PannerRule;
+
+    //==============================================================================
+    /** Constructor. */
+    Panner();
+
+    //==============================================================================
+    /** Sets the panning rule. */
+    void setRule (Rule newRule);
+
+    /** Sets the current panning value, between -1 (full left) and 1 (full right). */
+    void setPan (SampleType newPan);
+
+    //==============================================================================
+    /** Initialises the processor. */
+    void prepare (const ProcessSpec& spec);
+
+    /** Resets the internal state variables of the processor. */
+    void reset();
+
+    //==============================================================================
+    /** Processes the input and output samples supplied in the processing context. */
+    template <typename ProcessContext>
+    void process (const ProcessContext& context) noexcept
+    {
+        const auto& inputBlock = context.getInputBlock();
+        auto& outputBlock      = context.getOutputBlock();
+
+        const auto numInputChannels  = inputBlock.getNumChannels();
+        const auto numOutputChannels = outputBlock.getNumChannels();
+        const auto numSamples        = outputBlock.getNumSamples();
+
+        jassertquiet (inputBlock.getNumSamples() == numSamples);
+
+        if (numOutputChannels != 2 || numInputChannels == 0 || numInputChannels > 2)
+            return;
+
+        if (numInputChannels == 2)
+        {
+            outputBlock.copyFrom (inputBlock);
+        }
+        else
+        {
+            outputBlock.getSingleChannelBlock (0).copyFrom (inputBlock);
+            outputBlock.getSingleChannelBlock (1).copyFrom (inputBlock);
+        }
+
+        if (context.isBypassed)
+            return;
+
+        outputBlock.getSingleChannelBlock (0).multiplyBy (leftVolume);
+        outputBlock.getSingleChannelBlock (1).multiplyBy (rightVolume);
+    }
+
+private:
+    //==============================================================================
+    void update();
+
+    //==============================================================================
+    Rule currentRule = Rule::balanced;
+    SampleType pan = 0.0;
+    SmoothedValue<SampleType> leftVolume, rightVolume;
+    double sampleRate = 44100.0;
+};
+
+} // namespace dsp
+} // namespace juce