mirror of https://github.com/ppy/osu
241 lines
11 KiB
C#
241 lines
11 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using osu.Framework.Graphics;
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using osu.Game.Beatmaps;
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using osu.Game.Rulesets.Objects;
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using osu.Game.Rulesets.Osu.Objects;
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using osuTK;
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namespace osu.Game.Rulesets.Osu.Beatmaps
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{
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public class OsuBeatmapProcessor : BeatmapProcessor
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{
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private const int stack_distance = 3;
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public OsuBeatmapProcessor(IBeatmap beatmap)
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: base(beatmap)
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{
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}
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public override void PostProcess()
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{
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base.PostProcess();
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var osuBeatmap = (Beatmap<OsuHitObject>)Beatmap;
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if (osuBeatmap.HitObjects.Count > 0)
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{
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// Reset stacking
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foreach (var h in osuBeatmap.HitObjects)
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h.StackHeight = 0;
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if (Beatmap.BeatmapInfo.BeatmapVersion >= 6)
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applyStacking(osuBeatmap, 0, osuBeatmap.HitObjects.Count - 1);
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else
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applyStackingOld(osuBeatmap);
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}
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}
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private void applyStacking(Beatmap<OsuHitObject> beatmap, int startIndex, int endIndex)
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{
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if (startIndex > endIndex) throw new ArgumentOutOfRangeException(nameof(startIndex), $"{nameof(startIndex)} cannot be greater than {nameof(endIndex)}.");
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if (startIndex < 0) throw new ArgumentOutOfRangeException(nameof(startIndex), $"{nameof(startIndex)} cannot be less than 0.");
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if (endIndex < 0) throw new ArgumentOutOfRangeException(nameof(endIndex), $"{nameof(endIndex)} cannot be less than 0.");
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int extendedEndIndex = endIndex;
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if (endIndex < beatmap.HitObjects.Count - 1)
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{
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// Extend the end index to include objects they are stacked on
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for (int i = endIndex; i >= startIndex; i--)
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{
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int stackBaseIndex = i;
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for (int n = stackBaseIndex + 1; n < beatmap.HitObjects.Count; n++)
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{
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OsuHitObject stackBaseObject = beatmap.HitObjects[stackBaseIndex];
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if (stackBaseObject is Spinner) break;
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OsuHitObject objectN = beatmap.HitObjects[n];
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if (objectN is Spinner)
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continue;
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double endTime = stackBaseObject.GetEndTime();
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double stackThreshold = objectN.TimePreempt * beatmap.BeatmapInfo.StackLeniency;
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if (objectN.StartTime - endTime > stackThreshold)
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// We are no longer within stacking range of the next object.
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break;
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if (Vector2Extensions.Distance(stackBaseObject.Position, objectN.Position) < stack_distance
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|| (stackBaseObject is Slider && Vector2Extensions.Distance(stackBaseObject.EndPosition, objectN.Position) < stack_distance))
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{
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stackBaseIndex = n;
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// HitObjects after the specified update range haven't been reset yet
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objectN.StackHeight = 0;
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}
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}
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if (stackBaseIndex > extendedEndIndex)
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{
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extendedEndIndex = stackBaseIndex;
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if (extendedEndIndex == beatmap.HitObjects.Count - 1)
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break;
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}
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}
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}
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// Reverse pass for stack calculation.
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int extendedStartIndex = startIndex;
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for (int i = extendedEndIndex; i > startIndex; i--)
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{
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int n = i;
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/* We should check every note which has not yet got a stack.
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* Consider the case we have two interwound stacks and this will make sense.
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*
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* o <-1 o <-2
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* o <-3 o <-4
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*
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* We first process starting from 4 and handle 2,
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* then we come backwards on the i loop iteration until we reach 3 and handle 1.
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* 2 and 1 will be ignored in the i loop because they already have a stack value.
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*/
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OsuHitObject objectI = beatmap.HitObjects[i];
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if (objectI.StackHeight != 0 || objectI is Spinner) continue;
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double stackThreshold = objectI.TimePreempt * beatmap.BeatmapInfo.StackLeniency;
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/* If this object is a hitcircle, then we enter this "special" case.
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* It either ends with a stack of hitcircles only, or a stack of hitcircles that are underneath a slider.
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* Any other case is handled by the "is Slider" code below this.
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*/
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if (objectI is HitCircle)
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{
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while (--n >= 0)
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{
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OsuHitObject objectN = beatmap.HitObjects[n];
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if (objectN is Spinner) continue;
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double endTime = objectN.GetEndTime();
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if (objectI.StartTime - endTime > stackThreshold)
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// We are no longer within stacking range of the previous object.
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break;
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// HitObjects before the specified update range haven't been reset yet
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if (n < extendedStartIndex)
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{
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objectN.StackHeight = 0;
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extendedStartIndex = n;
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}
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/* This is a special case where hticircles are moved DOWN and RIGHT (negative stacking) if they are under the *last* slider in a stacked pattern.
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* o==o <- slider is at original location
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* o <- hitCircle has stack of -1
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* o <- hitCircle has stack of -2
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*/
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if (objectN is Slider && Vector2Extensions.Distance(objectN.EndPosition, objectI.Position) < stack_distance)
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{
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int offset = objectI.StackHeight - objectN.StackHeight + 1;
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for (int j = n + 1; j <= i; j++)
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{
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// For each object which was declared under this slider, we will offset it to appear *below* the slider end (rather than above).
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OsuHitObject objectJ = beatmap.HitObjects[j];
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if (Vector2Extensions.Distance(objectN.EndPosition, objectJ.Position) < stack_distance)
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objectJ.StackHeight -= offset;
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}
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// We have hit a slider. We should restart calculation using this as the new base.
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// Breaking here will mean that the slider still has StackCount of 0, so will be handled in the i-outer-loop.
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break;
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}
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if (Vector2Extensions.Distance(objectN.Position, objectI.Position) < stack_distance)
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{
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// Keep processing as if there are no sliders. If we come across a slider, this gets cancelled out.
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//NOTE: Sliders with start positions stacking are a special case that is also handled here.
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objectN.StackHeight = objectI.StackHeight + 1;
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objectI = objectN;
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}
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}
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}
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else if (objectI is Slider)
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{
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/* We have hit the first slider in a possible stack.
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* From this point on, we ALWAYS stack positive regardless.
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*/
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while (--n >= startIndex)
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{
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OsuHitObject objectN = beatmap.HitObjects[n];
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if (objectN is Spinner) continue;
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if (objectI.StartTime - objectN.StartTime > stackThreshold)
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// We are no longer within stacking range of the previous object.
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break;
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if (Vector2Extensions.Distance(objectN.EndPosition, objectI.Position) < stack_distance)
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{
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objectN.StackHeight = objectI.StackHeight + 1;
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objectI = objectN;
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}
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}
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}
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}
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}
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private void applyStackingOld(Beatmap<OsuHitObject> beatmap)
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{
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for (int i = 0; i < beatmap.HitObjects.Count; i++)
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{
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OsuHitObject currHitObject = beatmap.HitObjects[i];
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if (currHitObject.StackHeight != 0 && !(currHitObject is Slider))
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continue;
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double startTime = currHitObject.GetEndTime();
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int sliderStack = 0;
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for (int j = i + 1; j < beatmap.HitObjects.Count; j++)
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{
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double stackThreshold = beatmap.HitObjects[i].TimePreempt * beatmap.BeatmapInfo.StackLeniency;
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if (beatmap.HitObjects[j].StartTime - stackThreshold > startTime)
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break;
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// The start position of the hitobject, or the position at the end of the path if the hitobject is a slider
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Vector2 position2 = currHitObject is Slider currSlider
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? currSlider.Position + currSlider.Path.PositionAt(1)
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: currHitObject.Position;
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// Note the use of `StartTime` in the code below doesn't match stable's use of `EndTime`.
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// This is because in the stable implementation, `UpdateCalculations` is not called on the inner-loop hitobject (j)
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// and therefore it does not have a correct `EndTime`, but instead the default of `EndTime = StartTime`.
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//
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// Effects of this can be seen on https://osu.ppy.sh/beatmapsets/243#osu/1146 at sliders around 86647 ms, where
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// if we use `EndTime` here it would result in unexpected stacking.
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if (Vector2Extensions.Distance(beatmap.HitObjects[j].Position, currHitObject.Position) < stack_distance)
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{
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currHitObject.StackHeight++;
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startTime = beatmap.HitObjects[j].StartTime;
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}
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else if (Vector2Extensions.Distance(beatmap.HitObjects[j].Position, position2) < stack_distance)
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{
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// Case for sliders - bump notes down and right, rather than up and left.
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sliderStack++;
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beatmap.HitObjects[j].StackHeight -= sliderStack;
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startTime = beatmap.HitObjects[j].StartTime;
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}
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}
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}
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}
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}
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}
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