/** @param last May be null. */
private TrackEntry trackEntry(
int trackIndex, Animation animation, boolean loop, TrackEntry last) {
TrackEntry entry = trackEntryPool.obtain();
entry.trackIndex = trackIndex;
entry.animation = animation;
entry.loop = loop;
entry.eventThreshold = 0;
entry.attachmentThreshold = 0;
entry.drawOrderThreshold = 0;
entry.animationStart = 0;
entry.animationEnd = animation.getDuration();
entry.animationLast = -1;
entry.nextAnimationLast = -1;
entry.delay = 0;
entry.trackTime = 0;
entry.trackLast = -1;
entry.nextTrackLast = -1;
entry.trackEnd = Float.MAX_VALUE;
entry.timeScale = 1;
entry.alpha = 1;
entry.mixAlpha = 1;
entry.mixTime = 0;
entry.mixDuration = last == null ? 0 : data.getMix(last.animation, animation);
return entry;
}
/**
* Increments each track entry {@link TrackEntry#getTrackTime()}, setting queued animations as
* current if needed.
*/
public void update(float delta) {
delta *= timeScale;
for (int i = 0, n = tracks.size; i < n; i++) {
TrackEntry current = tracks.get(i);
if (current == null) continue;
current.animationLast = current.nextAnimationLast;
current.trackLast = current.nextTrackLast;
float currentDelta = delta * current.timeScale;
if (current.delay > 0) {
current.delay -= currentDelta;
if (current.delay > 0) continue;
currentDelta = -current.delay;
current.delay = 0;
}
TrackEntry next = current.next;
if (next != null) {
// When the next entry's delay is passed, change to the next entry, preserving leftover
// time.
float nextTime = current.trackLast - next.delay;
if (nextTime >= 0) {
next.delay = 0;
next.trackTime = nextTime + delta * next.timeScale;
current.trackTime += currentDelta;
setCurrent(i, next, true);
while (next.mixingFrom != null) {
next.mixTime += currentDelta;
next = next.mixingFrom;
}
continue;
}
} else {
// Clear the track when there is no next entry, the track end time is reached, and there is
// no mixingFrom.
if (current.trackLast >= current.trackEnd && current.mixingFrom == null) {
tracks.set(i, null);
queue.end(current);
disposeNext(current);
continue;
}
}
updateMixingFrom(current, delta);
current.trackTime += currentDelta;
}
queue.drain();
}
private void updateMixingFrom(TrackEntry entry, float delta) {
TrackEntry from = entry.mixingFrom;
if (from == null) return;
updateMixingFrom(from, delta);
if (entry.mixTime >= entry.mixDuration && from.mixingFrom == null && entry.mixTime > 0) {
entry.mixingFrom = null;
queue.end(from);
return;
}
from.animationLast = from.nextAnimationLast;
from.trackLast = from.nextTrackLast;
from.trackTime += delta * from.timeScale;
entry.mixTime += delta * entry.timeScale;
}
private void setCurrent(int index, TrackEntry current, boolean interrupt) {
TrackEntry from = expandToIndex(index);
tracks.set(index, current);
if (from != null) {
if (interrupt) queue.interrupt(from);
current.mixingFrom = from;
current.mixTime = 0;
from.timelinesRotation.clear(); // Reset rotation for mixing out, in case entry was mixed in.
// If not completely mixed in, set mixAlpha so mixing out happens from current mix to zero.
if (from.mixingFrom != null && from.mixDuration > 0)
current.mixAlpha *= Math.min(from.mixTime / from.mixDuration, 1);
}
queue.start(current);
}