even more stuff

core/src/dsp/taps/windowed_sinc.h

@@ -0,0 +1,35 @@
+#pragma once
+#include "tap.h"
+#include "../math/sinc.h"
+#include "../math/freq_to_omega.h"
+#include "../window/nuttall.h"
+
+namespace dsp::taps {
+    template<class T, typename Func>
+    inline tap<T> windowedSinc(int count, double omega, Func window, double norm = 1.0) {
+        // Allocate taps
+        tap<T> taps = taps::alloc<T>(count);
+        
+        // Generate using window
+        double half = (double)count / 2.0;
+        double corr = norm * omega / DB_M_PI;
+        
+        for (int i = 0; i < count; i++) {
+            double t = (double)i - half + 0.5;
+            if constexpr (std::is_same_v<T, float>) {
+                taps.taps[i] = math::sinc(t * omega) * window(t - half, count) * corr;
+            }
+            if constexpr (std::is_same_v<T, complex_t>) {
+                complex_t cplx = { math::sinc(t * omega), 0.0f };
+                taps.taps[i] = cplx * window(t - half, count) * corr;
+            }
+        }
+
+        return taps;
+    }
+
+    template<class T, typename Func>
+    inline tap<T> windowedSinc(int count, double cutoff, double samplerate, Func window, double norm = 1.0) {
+        return windowedSinc<T>(count, math::freqToOmega(cutoff, samplerate), window, norm);
+    }
+}