init

dsp.c

@@ -0,0 +1,55 @@
+#include "dsp.h"
+#include "osc.h"
+#include <stdlib.h>
+#include <math.h>
+
+#ifndef TAU
+#define TAU (6.283185307179586)
+#endif
+
+float next_sample(synthesizer *synth)
+{
+    osc *vco1 = &synth->vco1;
+    osc *vco2 = &synth->vco2;
+    osc *vco3 = &synth->vco3;
+
+    float s = 0;
+
+    // float freq = 220 + 30 * osc_process(lfo2, SAMPLE_RATE);
+    // atomic_store(&data->vco1.freq_target, freq);
+
+    s += osc_process(vco1);
+    s += osc_process(vco2);
+    s += osc_process(vco3);
+
+    s *= (0.33);
+    s *= 0.4;
+
+    return s;
+}
+
+synthesizer *synth_create(float sample_rate)
+{
+    synthesizer *synth = malloc(sizeof *synth);
+    if (!synth)
+        return NULL;
+
+    synth->sr = sample_rate;
+
+    for (int i = 0; i < 2048; i++) {
+        synth->wavetable[i] = sin((float)i * TAU/2048);
+    }
+
+    float base = 220;
+    osc_create(&synth->vco1, base, sample_rate, synth->wavetable);
+    osc_create(&synth->vco2, base * 5.0/4.0 * 1.003, sample_rate, synth->wavetable);
+    osc_create(&synth->vco3, base * 3.0/2.0 * 0.998, sample_rate, synth->wavetable);
+    osc_create(&synth->lfo1, 440, sample_rate, synth->wavetable);
+    osc_create(&synth->lfo2, 880, sample_rate, synth->wavetable);
+
+    return synth;
+}
+
+void synth_destroy(synthesizer *s) {
+    free(s);
+}