99 lines
8.8 KiB
Plaintext
99 lines
8.8 KiB
Plaintext
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Extrapolation º using System;
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using UnityEngine;
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// Extension methods responsible for managing extrapolation time
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namespace UnityEngine.Timeline
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{
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static class Extrapolation
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{
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/// <summary>
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/// The minimum amount of extrapolation time to apply
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/// </summary>
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internal static readonly double kMinExtrapolationTime = TimeUtility.kTimeEpsilon * 1000;
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// Calculates the extrapolation times
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internal static void CalculateExtrapolationTimes(this TrackAsset asset)
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{
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TimelineClip[] clips = asset.clips;
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if (clips == null || clips.Length == 0)
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return;
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// extrapolation not supported
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if (!clips[0].SupportsExtrapolation())
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return;
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var orderedClips = SortClipsByStartTime(clips);
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if (orderedClips.Length > 0)
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{
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// post extrapolation is the minimum time to the next clip
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for (int i = 0; i < orderedClips.Length; i++)
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{
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double minTime = double.PositiveInfinity;
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for (int j = 0; j < orderedClips.Length; j++)
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{
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if (i == j)
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continue;
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double deltaTime = orderedClips[j].start - orderedClips[i].end;
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if (deltaTime >= -TimeUtility.kTimeEpsilon && deltaTime < minTime)
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minTime = Math.Min(minTime, deltaTime);
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// check for overlapped clips
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if (orderedClips[j].start <= orderedClips[i].end && orderedClips[j].end > orderedClips[i].end)
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minTime = 0;
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}
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minTime = minTime <= kMinExtrapolationTime ? 0 : minTime;
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orderedClips[i].SetPostExtrapolationTime(minTime);
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}
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// the first clip gets pre-extrapolation, then it's only respected if there is no post extrapolation
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orderedClips[0].SetPreExtrapolationTime(Math.Max(0, orderedClips[0].start));
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for (int i = 1; i < orderedClips.Length; i++)
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{
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double preTime = 0;
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int prevClip = -1;
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for (int j = 0; j < i; j++)
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{
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// overlap, no pre-time
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if (orderedClips[j].end > orderedClips[i].start)
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{
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prevClip = -1;
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preTime = 0;
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break;
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}
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double gap = orderedClips[i].start - orderedClips[j].end;
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if (prevClip == -1 || gap < preTime)
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{
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preTime = gap;
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prevClip = j;
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}
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}
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// check for a post extrapolation time
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if (prevClip >= 0)
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{
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if (orderedClips[prevClip].postExtrapolationMode != TimelineClip.ClipExtrapolation.None)
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preTime = 0;
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}
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preTime = preTime <= kMinExtrapolationTime ? 0 : preTime;
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orderedClips[i].SetPreExtrapolationTime(preTime);
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}
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}
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}
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static TimelineClip[] SortClipsByStartTime(TimelineClip[] clips)
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{
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var orderedClips = new TimelineClip[clips.Length];
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Array.Copy(clips, orderedClips, clips.Length);
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Array.Sort(orderedClips, (clip1, clip2) => clip1.start.CompareTo(clip2.start));
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