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/maths/juce_SpecialFunctions.h

@@ -0,0 +1,67 @@
+/*
+  ==============================================================================
+
+   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
+{
+
+/**
+    Contains miscellaneous filter design and windowing functions.
+
+    @tags{DSP}
+*/
+struct SpecialFunctions
+{
+    /** Computes the modified Bessel function of the first kind I0 for a
+        given double value x. Modified Bessel functions are useful to solve
+        various mathematical problems involving differential equations.
+    */
+    static double besselI0 (double x) noexcept;
+
+    /** Computes the complete elliptic integral of the first kind K for a
+        given double value k, and the associated complete elliptic integral
+        of the first kind Kp for the complementary modulus of k.
+    */
+    static void ellipticIntegralK (double k, double& K, double& Kp) noexcept;
+
+    /** Computes the Jacobian elliptic function cd for the elliptic
+        modulus k and the quarter-period units u.
+    */
+    static Complex<double> cde (Complex<double> u, double k) noexcept;
+
+    /** Computes the Jacobian elliptic function sn for the elliptic
+        modulus k and the quarter-period units u.
+    */
+    static Complex<double> sne (Complex<double> u, double k) noexcept;
+
+    /** Computes the inverse of the Jacobian elliptic function sn
+        for the elliptic modulus k and the quarter-period units u.
+    */
+    static Complex<double> asne (Complex<double> w, double k) noexcept;
+};
+
+} // namespace dsp
+} // namespace juce