minblep.hpp

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#pragma once
#include <dsp/common.hpp>
 
 
namespace rack {
namespace dsp {
 

void minBlepImpulse(int z, int o, float* output);
 
 
template <int Z, int O, typename T = float>
struct MinBlepGenerator {
    T buf[2 * Z] = {};
    int pos = 0;
    float impulse[2 * Z * O + 1];
 
    MinBlepGenerator() {
        minBlepImpulse(Z, O, impulse);
        impulse[2 * Z * O] = 1.f;
    }

    void insertDiscontinuity(float p, T x) {
        if (!(-1 < p && p <= 0))
            return;
        for (int j = 0; j < 2 * Z; j++) {
            float minBlepIndex = ((float)j - p) * O;
            int index = (pos + j) % (2 * Z);
            buf[index] += x * (-1.f + math::interpolateLinear(impulse, minBlepIndex));
        }
    }
 
    T process() {
        T v = buf[pos];
        buf[pos] = T(0);
        pos = (pos + 1) % (2 * Z);
        return v;
    }
};
 
 
} // namespace dsp
} // namespace rack