55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
#include "dsp.h"
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#include "osc.h"
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#include <stdlib.h>
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#include <math.h>
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#ifndef TAU
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#define TAU (6.283185307179586)
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#endif
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float next_sample(synthesizer *synth)
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{
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osc *vco1 = &synth->vco1;
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osc *vco2 = &synth->vco2;
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osc *vco3 = &synth->vco3;
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float s = 0;
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// float freq = 220 + 30 * osc_process(lfo2, SAMPLE_RATE);
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// atomic_store(&data->vco1.freq_target, freq);
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s += osc_process(vco1);
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s += osc_process(vco2);
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s += osc_process(vco3);
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s *= (0.33);
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s *= 0.4;
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return s;
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}
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synthesizer *synth_create(float sample_rate)
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{
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synthesizer *synth = malloc(sizeof *synth);
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if (!synth)
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return NULL;
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synth->sr = sample_rate;
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for (int i = 0; i < 2048; i++) {
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synth->wavetable[i] = sin((float)i * TAU/2048);
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}
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float base = 220;
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osc_create(&synth->vco1, base, sample_rate, synth->wavetable);
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osc_create(&synth->vco2, base * 5.0/4.0 * 1.003, sample_rate, synth->wavetable);
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osc_create(&synth->vco3, base * 3.0/2.0 * 0.998, sample_rate, synth->wavetable);
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osc_create(&synth->lfo1, 440, sample_rate, synth->wavetable);
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osc_create(&synth->lfo2, 880, sample_rate, synth->wavetable);
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return synth;
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}
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void synth_destroy(synthesizer *s) {
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free(s);
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}
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