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// This file is part of the 64k demo project.
// It implements the tracker runtime logic.
#include "tracker.h"
#include "audio/synth.h"
#include <cstring>
#include <vector>
static uint32_t g_last_trigger_idx = 0;
struct ManagedSpectrogram {
int synth_id;
float* data;
bool active;
};
// Simple pool for dynamic spectrograms
static ManagedSpectrogram g_spec_pool[MAX_SPECTROGRAMS];
void tracker_init() {
g_last_trigger_idx = 0;
for (int i = 0; i < MAX_SPECTROGRAMS; ++i) {
g_spec_pool[i].synth_id = -1;
g_spec_pool[i].data = nullptr;
g_spec_pool[i].active = false;
}
}
static int get_free_pool_slot() {
for (int i = 0; i < MAX_SPECTROGRAMS; ++i) {
if (!g_spec_pool[i].active)
return i;
}
// If no free slot, find one where the synth voice is inactive
// (In a real implementation, we'd check if any voice is still using this)
// For now, just wrap around or return -1
return -1;
}
void tracker_update(float time_sec) {
while (g_last_trigger_idx < g_tracker_score.num_triggers) {
const TrackerPatternTrigger& trigger =
g_tracker_score.triggers[g_last_trigger_idx];
if (trigger.time_sec > time_sec)
break;
// Trigger pattern!
const TrackerPattern& pattern = g_tracker_patterns[trigger.pattern_id];
// Generate spectrogram for the pattern
int dest_num_frames = 0;
std::vector<float> pattern_data;
float beat_to_sec = 60.0f / g_tracker_score.bpm;
for (uint32_t i = 0; i < pattern.num_events; ++i) {
const TrackerEvent& event = pattern.events[i];
const NoteParams& params = g_tracker_samples[event.sample_id];
int note_frames = 0;
std::vector<float> note_data =
generate_note_spectrogram(params, ¬e_frames);
int frame_offset = (int)(event.beat * beat_to_sec * 32000.0f / DCT_SIZE);
paste_spectrogram(pattern_data, &dest_num_frames, note_data, note_frames,
frame_offset);
}
// Register with synth
int slot = get_free_pool_slot();
if (slot != -1) {
// Clean up old if needed
if (g_spec_pool[slot].synth_id != -1) {
synth_unregister_spectrogram(g_spec_pool[slot].synth_id);
delete[] g_spec_pool[slot].data;
}
g_spec_pool[slot].data = new float[pattern_data.size()];
memcpy(g_spec_pool[slot].data, pattern_data.data(),
pattern_data.size() * sizeof(float));
Spectrogram spec;
spec.spectral_data_a = g_spec_pool[slot].data;
spec.spectral_data_b = g_spec_pool[slot].data;
spec.num_frames = dest_num_frames;
g_spec_pool[slot].synth_id = synth_register_spectrogram(&spec);
g_spec_pool[slot].active = true;
synth_trigger_voice(g_spec_pool[slot].synth_id, 1.0f, 0.0f);
}
g_last_trigger_idx++;
}
}
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