template wizardry resulting in a mono version of SVFilter for synth use

notes

@@ -35,9 +35,7 @@ TODO {
         about-license info
     }
     
-    - fix overrun-by-1 on sample preview
-    
-    templatize svfilter and have mono version for synth use
+    - templatize svfilter and have mono version for synth use
     
     revert-to-saved menu action
     

xybrid/nodelib/svfilter.cpp

@@ -4,10 +4,15 @@
 #include "audio/audioengine.h"
 
 using Xybrid::NodeLib::SVFilter;
+using Xybrid::NodeLib::GenericSVFilter;
 using Xybrid::Data::AudioFrame;
 using namespace Xybrid::Audio;
 
-void SVFilter::process(AudioFrame in, double cutoff, double resonance, int ovs) {
+template class Xybrid::NodeLib::GenericSVFilter<AudioFrame>;
+template class Xybrid::NodeLib::GenericSVFilter<double>;
+
+template<typename DT>
+void GenericSVFilter<DT>::process(DT in, double cutoff, double resonance, int ovs) {
     if (ovs <= 0) return;
     cutoff = std::max(cutoff, 1.0);
     resonance = std::max(resonance, 0.01);

xybrid/nodelib/svfilter.h

@@ -7,32 +7,44 @@
 
 namespace Xybrid::NodeLib {
     /// 12db Chamberlin State Variable Filter
-    class SVFilter {
-        //
+    template<typename DT> class GenericSVFilter {
     public:
         /// Default oversampling level. Enough to mostly eliminate artifacting at high cutoff.
         static const constexpr int DEFAULT_OVERSAMP = 3;
 
-        Data::AudioFrame low = 0.0;
-        Data::AudioFrame high = 0.0;
-        Data::AudioFrame band = 0.0;
-        Data::AudioFrame notch = 0.0;
+        DT low = 0.0;
+        DT high = 0.0;
+        DT band = 0.0;
+        DT notch = 0.0;
 
-        SVFilter() = default;
-        ~SVFilter() = default;
+        GenericSVFilter() = default;
+        ~GenericSVFilter() = default;
         // nothing used here should care about taking the raw approach
-        inline SVFilter(const SVFilter& o) { std::memcpy(static_cast<void*>(this), static_cast<const void*>(&o), sizeof(SVFilter)); }
-        inline SVFilter& operator=(const SVFilter& o) { std::memcpy(static_cast<void*>(this), static_cast<const void*>(&o), sizeof(SVFilter)); return *this; }
+        inline GenericSVFilter<DT>(const GenericSVFilter<DT>& o) { std::memcpy(static_cast<void*>(this), static_cast<const void*>(&o), sizeof(o)); }
+        inline GenericSVFilter<DT>& operator=(const GenericSVFilter<DT>& o) { std::memcpy(static_cast<void*>(this), static_cast<const void*>(&o), sizeof(o)); return *this; }
 
-        void process(Data::AudioFrame in, double cutoff, double resonance, int oversamp = DEFAULT_OVERSAMP);
+        void process(DT in, double cutoff, double resonance, int oversamp = DEFAULT_OVERSAMP);
         inline void reset() { low = 0.0; high = 0.0; band = 0.0; notch = 0.0; }
-        inline void normalize(double m = 1.0) {
-            low = low.clamp(m);
-            high = high.clamp(m);
-            band = band.clamp(m);
-            notch = notch.clamp(m);
+        inline void normalize(double m) {
+            if constexpr (std::is_arithmetic_v<DT>) {
+                low = std::clamp(low, -m, m);
+                high = std::clamp(high, -m, m);
+                band = std::clamp(band, -m, m);
+                notch = std::clamp(notch, -m, m);
+            } else {
+                low = low.clamp(m);
+                high = high.clamp(m);
+                band = band.clamp(m);
+                notch = notch.clamp(m);
+            }
         }
 
         static inline double scaledResonance(double r) { return std::pow(10, r*5); }
+
     };
+
+    /// 12db Chamberlin State Variable Filter
+    typedef GenericSVFilter<Data::AudioFrame> SVFilter;
+    /// 12db Chamberlin State Variable Filter (mono version)
+    typedef GenericSVFilter<double> SVFilterM;
 }