jake/soundThing
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Mapped oscillator pulse width to modulation wheel.

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This commit is contained in:
Anachronaut
2026-03-14 09:23:08 -04:00
parent 48ee8c2c75
commit 801ea22d3e
3 changed files with 9 additions and 1 deletions
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2
include/synth.h
View File

@@ -3,7 +3,7 @@
#include <stdint.h> #include <stdint.h>
#define VOICE_COUNT 8 #define VOICE_COUNT 16
typedef enum { typedef enum {
WAVE_SINE, WAVE_SINE,

6
source/midi.c
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@@ -96,12 +96,18 @@ void *midiThread(void *arg)
synthNoteOff(m->synth, ev->data.note.note); synthNoteOff(m->synth, ev->data.note.note);
break; break;
case SND_SEQ_EVENT_CONTROLLER: case SND_SEQ_EVENT_CONTROLLER:
// This are controller parameter changes.
// Map the Mod Wheel to PWM:
if (ev->data.control.param == 1)
m->synth->dutyCycle = 0.05f + (ev->data.control.value / 127.0f) * 0.90f;
// This naively maps parameter 70 to the waveform in a way that does not play so nice with real pots.
if (ev->data.control.param == 70) if (ev->data.control.param == 70)
m->synth->waveform = ev->data.control.value % WAVE_COUNT; m->synth->waveform = ev->data.control.value % WAVE_COUNT;
break; break;
case SND_SEQ_EVENT_PITCHBEND: case SND_SEQ_EVENT_PITCHBEND:
m->synth->pitchBend = ev->data.control.value / 8191.0f; m->synth->pitchBend = ev->data.control.value / 8191.0f;
break; break;
} }
snd_seq_free_event(ev); snd_seq_free_event(ev);
ev = NULL; ev = NULL;

2
source/soundThing.c
View File

@@ -79,6 +79,8 @@ int main(void)
20, 55, 20, RAYWHITE); 20, 55, 20, RAYWHITE);
DrawText(TextFormat("MIDI: client %d port %d", gMidi.client, gMidi.port), DrawText(TextFormat("MIDI: client %d port %d", gMidi.client, gMidi.port),
20, 90, 20, GRAY); 20, 90, 20, GRAY);
if (gSynth.waveform == WAVE_PULSE)
DrawText(TextFormat("Duty Cycle: %.2f", gSynth.dutyCycle), 20, 280, 20, GREEN);
EndDrawing(); EndDrawing();
} }