void createTrill(int key1, int key2, int velocity, int channel, int duration) {
static FunctionEvent tn; // a Temporary Note for copying into eventBuffer
// key1 should always be smaller than key2
int temp;
if (key1 > key2) {
temp = key1;
key1 = key2;
key2 = temp;
}
// setting the fields of the function note
tn.setFunction(TrillAlgorithm);
tn.setChannel(channel);
tn.setKeyno(key1);
tn.setVelocity(velocity);
// set extra parameters
tn.charValue(15) = 0; // 0 = play key1 next, 1 = play key2 next
tn.charValue(14) = key2; // secondary pitch
tn.intValue(10) = t_time; // initialization time
tn.setStatus(EVENT_STATUS_ACTIVE);
// start time of function and the duration between calling it
tn.setOnDur(t_time + duration, duration);
eventBuffer.insert(tn);
cout << "Trill = " << key1 << " to " << key2
<< "\tRate = " << duration
<< endl;
}
static void TrillAlgorithm(FunctionEvent& p, EventBuffer& midiOutput) {
static NoteEvent note; // temporary note before placing in buffer
int key1 = p.getKey(); // lower key of trill
int key2 = p.charValue(14); // upper key of trill
int state = p.charValue(15); // which note to play next
int starttime = p.intValue(10); // when trill was started
int i;
// turn off the trill if there is a note played inside the trill
int range1 = key1;
int range2 = key2;
if (range2 - range1 == 1) {
range1--;
range2++;
}
for (i=range1; i<=range2; i++) {
if (noteontimes[i] > starttime) {
p.off(midiOutput);
return;
}
}
// set the next note to play
int key = state ? key2 : key1;
state = !state;
p.charValue(15) = state;
// set the parameters for the output note:
note.setOnDur(t_time, p.getDur());
note.setVel(p.getVel());
note.setChan(p.getChan());
note.setKey(key);
// update the parameters for the gliss function:
p.setOnTime(p.getOnTime() + p.getDur());
int value = p.getVel() + velcorrection;
if (value < 100 && value > 3) {
p.setVel(value);
}
if (p.getDur() + trillcorrection > MINTRIGTIME) {
p.setDur(p.getDur() + trillcorrection);
}
note.activate();
note.action(midiOutput); // start right now, avoiding any buffer delay
midiOutput.insert(note); // the note off message is being buffered
}