fix macOS build (following Projucer changes made in Windows, which removed /Applications/JUCE/modules from its headers). move JUCE headers under source control, so that Windows and macOS can both build against same version of JUCE. remove AUv3 target (I think it's an iOS thing, so it will never work with this macOS fluidsynth dylib).

modules/juce_dsp/maths/juce_LookupTable.cpp

@@ -0,0 +1,157 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2017 - ROLI Ltd.
+
+   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 5 End-User License
+   Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
+   27th April 2017).
+
+   End User License Agreement: www.juce.com/juce-5-licence
+   Privacy Policy: www.juce.com/juce-5-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
+{
+
+template <typename FloatType>
+LookupTable<FloatType>::LookupTable()
+{
+    data.resize (1);
+}
+
+template <typename FloatType>
+LookupTable<FloatType>::LookupTable (const std::function<FloatType (size_t)>& functionToApproximate,
+                                     size_t numPointsToUse)
+{
+    initialise (functionToApproximate, numPointsToUse);
+}
+
+//==============================================================================
+template <typename FloatType>
+void LookupTable<FloatType>::initialise (const std::function<FloatType (size_t)>& functionToApproximate,
+                                         size_t numPointsToUse)
+{
+    data.resize (static_cast<int> (getRequiredBufferSize (numPointsToUse)));
+
+    for (size_t i = 0; i < numPointsToUse; ++i)
+    {
+        auto value = functionToApproximate (i);
+
+        jassert (! std::isnan (value));
+        jassert (! std::isinf (value));
+        // Make sure functionToApproximate returns a sensible value for the entire specified range.
+        // E.g., this won't work for zero:  [] (size_t i) { return 1.0f / i; }
+
+        data.getReference (static_cast<int> (i)) = value;
+    }
+
+    prepare();
+}
+
+template <typename FloatType>
+void LookupTable<FloatType>::prepare() noexcept
+{
+    auto guardIndex = static_cast<int> (getGuardIndex());
+    data.getReference (guardIndex) = data.getUnchecked (guardIndex - 1);
+}
+
+template <typename FloatType>
+void LookupTableTransform<FloatType>::initialise (const std::function<FloatType (FloatType)>& functionToApproximate,
+                                                  FloatType minInputValueToUse,
+                                                  FloatType maxInputValueToUse,
+                                                  size_t numPoints)
+{
+    jassert (maxInputValueToUse > minInputValueToUse);
+
+    minInputValue = minInputValueToUse;
+    maxInputValue = maxInputValueToUse;
+    scaler = FloatType (numPoints - 1) / (maxInputValueToUse - minInputValueToUse);
+    offset = -minInputValueToUse * scaler;
+
+    const auto initFn = [functionToApproximate, minInputValueToUse, maxInputValueToUse, numPoints] (size_t i)
+    {
+        return functionToApproximate (
+            jlimit (
+                minInputValueToUse, maxInputValueToUse,
+                jmap (FloatType (i), FloatType (0), FloatType (numPoints - 1), minInputValueToUse, maxInputValueToUse))
+            );
+    };
+
+    lookupTable.initialise (initFn, numPoints);
+}
+
+//==============================================================================
+template <typename FloatType>
+double LookupTableTransform<FloatType>::calculateMaxRelativeError (const std::function<FloatType (FloatType)>& functionToApproximate,
+                                                                   FloatType minInputValue,
+                                                                   FloatType maxInputValue,
+                                                                   size_t numPoints,
+                                                                   size_t numTestPoints)
+{
+    jassert (maxInputValue > minInputValue);
+
+    if (numTestPoints == 0)
+        numTestPoints = 100 * numPoints;    // use default
+
+    LookupTableTransform transform (functionToApproximate, minInputValue, maxInputValue, numPoints);
+
+    double maxError = 0;
+
+    for (size_t i = 0; i < numTestPoints; ++i)
+    {
+        auto inputValue = jmap (FloatType (i), FloatType (0), FloatType (numTestPoints - 1), minInputValue, maxInputValue);
+        auto approximatedOutputValue = transform.processSample (inputValue);
+        auto referenceOutputValue = functionToApproximate (inputValue);
+
+        maxError = jmax (maxError, calculateRelativeDifference ((double) referenceOutputValue, (double) approximatedOutputValue));
+    }
+
+    return maxError;
+}
+
+//==============================================================================
+template <typename FloatType>
+double LookupTableTransform<FloatType>::calculateRelativeDifference (double x, double y) noexcept
+{
+    static const auto eps = std::numeric_limits<double>::min();
+
+    auto absX = std::abs (x);
+    auto absY = std::abs (y);
+    auto absDiff = std::abs (x - y);
+
+    if (absX < eps)
+    {
+        if (absY >= eps)
+            return absDiff / absY;
+
+        return absDiff;    // return the absolute error if both numbers are too close to zero
+    }
+
+    return absDiff / std::min (absX, absY);
+}
+
+//==============================================================================
+template class LookupTable<float>;
+template class LookupTable<double>;
+
+template class LookupTableTransform<float>;
+template class LookupTableTransform<double>;
+
+} // namespace dsp
+} // namespace juce