Prepare the coeffs initially in filter-based effects

src/sfizz/effects/Eq.cpp

@@ -36,6 +36,7 @@ namespace fx {
     void Eq::setSampleRate(double sampleRate)
     {
         _filter.init(sampleRate);
+        prepareFilter();
     }
 
     void Eq::setSamplesPerBlock(int samplesPerBlock)
@@ -46,6 +47,7 @@ namespace fx {
     void Eq::clear()
     {
         _filter.clear();
+        prepareFilter();
     }
 
     void Eq::process(const float* const inputs[], float* const outputs[], unsigned nframes)
@@ -93,5 +95,10 @@ namespace fx {
         return absl::make_unique<Eq>(desc);
     }
 
+    void Eq::prepareFilter()
+    {
+        _filter.prepare(_desc.frequency, _desc.bandwidth, _desc.gain);
+    }
+
 } // namespace fx
 } // namespace sfz

src/sfizz/effects/Eq.h

@@ -45,6 +45,9 @@ namespace fx {
           */
         static std::unique_ptr<Effect> makeInstance(absl::Span<const Opcode> members);
 
+    private:
+        void prepareFilter();
+
     private:
         sfz::FilterEq _filter;
         EQDescription _desc;

src/sfizz/effects/Filter.cpp

@@ -38,6 +38,7 @@ namespace fx {
     void Filter::setSampleRate(double sampleRate)
     {
         _filter.init(sampleRate);
+        prepareFilter();
     }
 
     void Filter::setSamplesPerBlock(int samplesPerBlock)
@@ -48,6 +49,7 @@ namespace fx {
     void Filter::clear()
     {
         _filter.clear();
+        prepareFilter();
     }
 
     void Filter::process(const float* const inputs[], float* const outputs[], unsigned nframes)
@@ -96,5 +98,10 @@ namespace fx {
         return absl::make_unique<Filter>(desc);
     }
 
+    void Filter::prepareFilter()
+    {
+        _filter.prepare(_desc.cutoff, _desc.resonance, _desc.gain);
+    }
+
 } // namespace fx
 } // namespace sfz

src/sfizz/effects/Filter.h

@@ -45,6 +45,9 @@ namespace fx {
           */
         static std::unique_ptr<Effect> makeInstance(absl::Span<const Opcode> members);
 
+    private:
+        void prepareFilter();
+
     private:
         sfz::Filter _filter;
         FilterDescription _desc;