WITH_BOOST define added

- some platforms don't support C++17 Special Mathmatical functions,
  most notibly macOS and llvm. This enables this to work by using
  boost for the bessel functions

.gitignore

@@ -1,5 +1,6 @@
 # ignore build artifacts
 build-*/*
+*.o
 
 # user config
 *.codekit
@@ -7,3 +8,4 @@ build-*/*
 *.pro.user.*
 *.stash
 *.autosave
+

xybrid/nodelib/resampler.cpp

@@ -1,10 +1,14 @@
 #include "resampler.h"
 using namespace Xybrid::NodeLib;
 
-#include <cmath>
+
 #include <iostream>
 #include <array>
-
+#ifdef WITH_BOOST
+#include <boost/math/special_functions/bessel.hpp>
+#else
+#include <cmath>
+#endif
 namespace {
     const constexpr double PI = 3.141592653589793238462643383279502884197169399375105820974;
 
@@ -18,17 +22,26 @@ namespace {
     }
 }
 
+
+
 // generate
 const std::array<std::array<double, LUT_TAPS>, LUT_STEPS> Xybrid::NodeLib::resamplerLUT = [] {
+#ifdef WITH_BOOST
+    double denom = boost::math::cyl_bessel_i(0, KAISER_BETA);
+#else
     double denom = std::cyl_bessel_i(0, KAISER_BETA);
-
+#endif
     std::array<std::array<double, LUT_TAPS>, LUT_STEPS> t;
     t[0] = {0, 0, 0, 1, 0, 0, 0, 0}; // we already know the ideal integer step
     for (size_t step = 1; step < LUT_STEPS; step++) {
         double sv = static_cast<double>(step) / LUT_STEPS;
         for (size_t tap = 0; tap < LUT_TAPS; tap++) {
             double x = static_cast<double>(tap) - sv;
+#ifdef WITH_BOOST
+              t[step][tap] = sinc(x-(LUT_TAPS/2-1)) * (boost::math::cyl_bessel_i(0, KAISER_BETA * std::sqrt(1 - std::pow(((2 * (x+1)) / (LUT_TAPS)) - 1, 2))) / denom);
+#else
             t[step][tap] = sinc(x-(LUT_TAPS/2-1)) * (std::cyl_bessel_i(0, KAISER_BETA * std::sqrt(1 - std::pow(((2 * (x+1)) / (LUT_TAPS)) - 1, 2))) / denom);
+#endif
             if (t[step][tap] != t[step][tap]) t[step][tap] = 0; // NaN guard
             //std::cout << "tap " << tap << ": " << t[step][tap] << " ";
         }

xybrid/xybrid.pro

@@ -17,6 +17,7 @@ TEMPLATE = app
 # deprecated API in order to know how to port your code away from it.
 DEFINES += QT_DEPRECATED_WARNINGS
 
+
 # You can also make your code fail to compile if you use deprecated APIs.
 # In order to do so, uncomment the following line.
 # You can also select to disable deprecated APIs only up to a certain version of Qt.
@@ -36,6 +37,24 @@ HEADERS += $$files(*.h, true) \
 FORMS += $$files(*.ui, true)
 RESOURCES += res/resources.qrc
 
+unix:!macx {
+
+}
+
+macx: {
+    DEFINES += WITH_BOOST
+    LIBS += -L/usr/local/Cellar/boost/1.70.0/lib/ -lboost_math_tr1
+    LIBS    += -framework OpenGL
+    QMAKE_CXXFLAGS += -I/usr/local/Cellar/boost/1.70.0/include/
+}
+
+# TODO: make this work.
+CONFIG (boost) {
+    DEFINES += WITH_BOOST
+    LIBS += -L$${BOOSTPATH}
+    QMAKE_CXXFLAGS += -I$${BOOSTINCLUDE}
+}
+
 # Default rules for deployment.
 qnx: target.path = /tmp/$${TARGET}/bin
 else: unix:!android: target.path = /opt/$${TARGET}/bin