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rename enum values, move event count to voice

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This commit is contained in:
Chris
2025-08-13 18:16:44 +02:00
parent 989ea9ba8f
commit e4f12dede3
1 changed files with 49 additions and 20 deletions
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69
synth/voice_allocator.h
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@@ -9,10 +9,10 @@ using namespace std;
namespace trnr {
enum midi_event_type {
note_on = 0,
note_off,
pitch_wheel,
mod_wheel
NOTE_ON = 0,
NOTE_OFF,
PITCH_WHEEL,
MOD_WHEEL
};
struct midi_event {
@@ -23,6 +23,34 @@ struct midi_event {
double data;
};
inline void make_note_on(midi_event& ev, int _midi_note, float _velocity, int _offset = 0)
{
ev.type = midi_event_type::NOTE_ON;
ev.midi_note = _midi_note;
ev.velocity = _velocity;
ev.offset = _offset;
}
inline void make_note_off(midi_event& ev, int _midi_note, float _velocity, int _offset = 0)
{
ev.type = midi_event_type::NOTE_OFF;
ev.midi_note = _midi_note;
ev.velocity = _velocity;
ev.offset = _offset;
}
inline void make_pitch_wheel(midi_event& ev, double _pitch, int _offset = 0)
{
ev.type = midi_event_type::PITCH_WHEEL;
ev.data = _pitch;
}
inline void make_mod_wheel(midi_event& ev, double _mod, int _offset = 0)
{
ev.type = midi_event_type::PITCH_WHEEL;
ev.data = _mod;
}
#ifndef MAX_VOICES
#define MAX_VOICES 16
#endif
@@ -38,18 +66,18 @@ struct voice_state {
bool trigger;
float velocity;
array<midi_event, MAX_EVENTS_PER_VOICE> events;
size_t event_count = 0;
};
struct voice_allocator {
array<voice_state, MAX_VOICES> voices;
array<size_t, MAX_EVENTS_PER_VOICE> counts;
int active_voice_count = 1;
size_t index_to_steal = 0;
};
inline void voice_allocator_init(voice_allocator& va)
{
for (size_t i = 0; i < MAX_VOICES; ++i) { va.counts[i] = 0; }
for (size_t i = 0; i < MAX_VOICES; ++i) { va.voices[i].event_count = 0; }
}
inline void voice_allocator_process_block(voice_allocator& va, const vector<midi_event>& midi_events)
@@ -57,16 +85,17 @@ inline void voice_allocator_process_block(voice_allocator& va, const vector<midi
// reset voice events and counts
for (int i = 0; i < MAX_VOICES; i++) {
for (int j = 0; j < MAX_EVENTS_PER_VOICE; j++) { va.voices[i].events[j] = midi_event {}; }
va.voices[i].event_count = 0;
}
for (const auto& ev : midi_events) {
switch (ev.type) {
case note_on: {
case NOTE_ON: {
bool found = false;
// attempt to find a free voice
for (size_t i = 0; i < va.active_voice_count; ++i) {
if (!va.voices[i].is_busy) {
va.voices[i].events[va.counts[i]++] = ev;
va.voices[i].events[va.voices[i].event_count++] = ev;
found = true;
break;
}
@@ -77,7 +106,7 @@ inline void voice_allocator_process_block(voice_allocator& va, const vector<midi
// try to find a voice that is not gated
for (size_t i = 0; i < va.active_voice_count; ++i) {
if (!va.voices[i].gate) {
va.voices[i].events[va.counts[i]++] = ev;
va.voices[i].events[va.voices[i].event_count++] = ev;
found = true;
break;
}
@@ -86,20 +115,20 @@ inline void voice_allocator_process_block(voice_allocator& va, const vector<midi
if (found) break;
// if all voices are gated, steal one round-robin
va.voices[va.index_to_steal].events[va.counts[va.index_to_steal]++] = ev;
va.voices[va.index_to_steal].events[va.voices[va.index_to_steal].event_count++] = ev;
va.index_to_steal++;
if (va.index_to_steal >= va.active_voice_count) va.index_to_steal = 0;
break;
}
case note_off: {
case NOTE_OFF: {
for (size_t i = 0; i < va.active_voice_count; ++i) {
if (va.voices[i].midi_note == ev.midi_note) va.voices[i].events[va.counts[i]++] = ev;
if (va.voices[i].midi_note == ev.midi_note) va.voices[i].events[va.voices[i].event_count++] = ev;
}
break;
}
case pitch_wheel:
case mod_wheel: {
for (size_t i = 0; i < va.active_voice_count; ++i) { va.voices[i].events[va.counts[i]++] = ev; }
case PITCH_WHEEL:
case MOD_WHEEL: {
for (size_t i = 0; i < va.active_voice_count; ++i) { va.voices[i].events[va.voices[i].event_count++] = ev; }
break;
}
}
@@ -114,24 +143,24 @@ inline void voice_process_event_for_frame(voice_state& v, size_t frame)
const midi_event& ev = v.events[i];
if (ev.offset == frame) {
best_event = &ev;
if (ev.type == note_on) break;
if (ev.type == NOTE_ON) break;
}
}
if (best_event) switch (best_event->type) {
case note_on:
case NOTE_ON:
v.midi_note = best_event->midi_note;
v.velocity = best_event->velocity;
v.is_busy = true;
v.gate = true;
v.trigger = true;
break;
case note_off:
case NOTE_OFF:
v.gate = false;
break;
// TODO: handle pitch wheel and mod wheel events
case pitch_wheel:
case mod_wheel:
case PITCH_WHEEL:
case MOD_WHEEL:
break;
}
}