288 lines
12 KiB
C#
288 lines
12 KiB
C#
// Animancer // https://kybernetik.com.au/animancer // Copyright 2018-2023 Kybernetik //
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using System;
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using System.Text;
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using UnityEngine;
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using UnityEngine.Animations;
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namespace Animancer
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{
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/// <summary>[Pro-Only]
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/// Base class for mixers which blend an array of child states together based on a <see cref="Parameter"/>.
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/// </summary>
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/// <remarks>
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/// Documentation: <see href="https://kybernetik.com.au/animancer/docs/manual/blending/mixers">Mixers</see>
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/// </remarks>
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/// https://kybernetik.com.au/animancer/api/Animancer/MixerState_1
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///
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public abstract class MixerState<TParameter> : ManualMixerState, ICopyable<MixerState<TParameter>>
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{
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/************************************************************************************************************************/
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#region Properties
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/************************************************************************************************************************/
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/// <summary>The parameter values at which each of the child states are used and blended.</summary>
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private TParameter[] _Thresholds = Array.Empty<TParameter>();
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/************************************************************************************************************************/
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private TParameter _Parameter;
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/// <summary>The value used to calculate the weights of the child states.</summary>
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/// <remarks>
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/// Setting this value takes effect immediately (during the next animation update) without any
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/// <see href="https://kybernetik.com.au/animancer/docs/manual/blending/mixers#smoothing">Smoothing</see>.
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/// </remarks>
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/// <exception cref="ArgumentOutOfRangeException">The value is NaN or Infinity.</exception>
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public TParameter Parameter
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{
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get => _Parameter;
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set
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{
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#if UNITY_ASSERTIONS
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var error = GetParameterError(value);
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if (error != null)
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throw new ArgumentOutOfRangeException(nameof(value), error);
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#endif
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_Parameter = value;
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WeightsAreDirty = true;
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RequireUpdate();
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}
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}
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/// <summary>
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/// Returns an error message if the given `parameter` value can't be assigned to the <see cref="Parameter"/>.
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/// Otherwise returns null.
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/// </summary>
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public abstract string GetParameterError(TParameter parameter);
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/************************************************************************************************************************/
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#endregion
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/************************************************************************************************************************/
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#region Thresholds
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/************************************************************************************************************************/
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/// <summary>
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/// Has the array of thresholds been initialized with a size at least equal to the
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/// <see cref="ManualMixerState.ChildCount"/>.
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/// </summary>
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public bool HasThresholds
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=> _Thresholds.Length >= ChildCount;
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/************************************************************************************************************************/
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/// <summary>Returns the value of the threshold associated with the specified `index`.</summary>
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public TParameter GetThreshold(int index)
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=> _Thresholds[index];
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/************************************************************************************************************************/
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/// <summary>Sets the value of the threshold associated with the specified `index`.</summary>
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public void SetThreshold(int index, TParameter threshold)
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{
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_Thresholds[index] = threshold;
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OnThresholdsChanged();
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}
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/************************************************************************************************************************/
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/// <summary>
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/// Assigns the specified array as the thresholds to use for blending.
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/// <para></para>
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/// WARNING: if you keep a reference to the `thresholds` array you must call <see cref="OnThresholdsChanged"/>
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/// whenever any changes are made to it, otherwise this mixer may not blend correctly.
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/// </summary>
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public void SetThresholds(params TParameter[] thresholds)
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{
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if (thresholds.Length < ChildCount)
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throw new ArgumentOutOfRangeException(nameof(thresholds),
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$"Threshold count ({thresholds.Length}) must not be less than child count ({ChildCount}).");
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_Thresholds = thresholds;
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OnThresholdsChanged();
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}
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/************************************************************************************************************************/
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/// <summary>
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/// If the <see cref="Array.Length"/> of the <see cref="_Thresholds"/> is below the
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/// <see cref="AnimancerNode.ChildCount"/>, this method assigns a new array with size equal to the
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/// <see cref="ManualMixerState.ChildCapacity"/> and returns true.
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/// </summary>
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public bool ValidateThresholdCount()
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{
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if (_Thresholds.Length >= ChildCount)
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return false;
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_Thresholds = new TParameter[ChildCapacity];
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return true;
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}
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/************************************************************************************************************************/
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/// <summary>
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/// Called whenever the thresholds are changed. By default this method simply indicates that the blend weights
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/// need recalculating but it can be overridden by child classes to perform validation checks or optimisations.
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/// </summary>
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public virtual void OnThresholdsChanged()
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{
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WeightsAreDirty = true;
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RequireUpdate();
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}
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/************************************************************************************************************************/
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/// <summary>
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/// Calls `calculate` for each of the <see cref="ManualMixerState.ChildStates"/> and stores the returned value
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/// as the threshold for that state.
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/// </summary>
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public void CalculateThresholds(Func<AnimancerState, TParameter> calculate)
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{
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ValidateThresholdCount();
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for (int i = ChildCount - 1; i >= 0; i--)
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_Thresholds[i] = calculate(GetChild(i));
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OnThresholdsChanged();
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}
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/************************************************************************************************************************/
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/// <summary>
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/// Stores the values of all parameters, calls <see cref="AnimancerNode.DestroyPlayable"/>, then restores the
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/// parameter values.
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/// </summary>
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public override void RecreatePlayable()
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{
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base.RecreatePlayable();
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WeightsAreDirty = true;
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RequireUpdate();
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}
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/************************************************************************************************************************/
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#endregion
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/************************************************************************************************************************/
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#region Initialization
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/************************************************************************************************************************/
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/// <inheritdoc/>
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protected override void OnChildCapacityChanged()
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{
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Array.Resize(ref _Thresholds, ChildCapacity);
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OnThresholdsChanged();
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}
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/************************************************************************************************************************/
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/// <summary>Assigns the `state` as a child of this mixer and assigns the `threshold` for it.</summary>
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public void Add(AnimancerState state, TParameter threshold)
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{
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Add(state);
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SetThreshold(state.Index, threshold);
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}
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/// <summary>
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/// Creates and returns a new <see cref="ClipState"/> to play the `clip` as a child of this mixer, and assigns
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/// the `threshold` for it.
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/// </summary>
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public ClipState Add(AnimationClip clip, TParameter threshold)
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{
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var state = Add(clip);
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SetThreshold(state.Index, threshold);
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return state;
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}
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/// <summary>
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/// Calls <see cref="AnimancerUtilities.CreateStateAndApply"/> then
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/// <see cref="Add(AnimancerState, TParameter)"/>.
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/// </summary>
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public AnimancerState Add(Animancer.ITransition transition, TParameter threshold)
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{
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var state = Add(transition);
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SetThreshold(state.Index, threshold);
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return state;
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}
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/// <summary>Calls one of the other <see cref="Add(object, TParameter)"/> overloads as appropriate.</summary>
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public AnimancerState Add(object child, TParameter threshold)
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{
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if (child is AnimationClip clip)
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return Add(clip, threshold);
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if (child is ITransition transition)
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return Add(transition, threshold);
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if (child is AnimancerState state)
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{
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Add(state, threshold);
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return state;
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}
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throw new ArgumentException($"Unable to add '{AnimancerUtilities.ToStringOrNull(child)}' as child of '{this}'.");
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}
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/************************************************************************************************************************/
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/// <inheritdoc/>
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void ICopyable<MixerState<TParameter>>.CopyFrom(MixerState<TParameter> copyFrom)
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{
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((ICopyable<ManualMixerState>)this).CopyFrom(copyFrom);
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var childCount = copyFrom.ChildCount;
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if (copyFrom._Thresholds != null)
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{
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_Thresholds = new TParameter[childCount];
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var count = Math.Min(childCount, copyFrom._Thresholds.Length);
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Array.Copy(copyFrom._Thresholds, _Thresholds, count);
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}
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Parameter = copyFrom.Parameter;
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}
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/************************************************************************************************************************/
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#endregion
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/************************************************************************************************************************/
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#region Descriptions
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/************************************************************************************************************************/
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/// <inheritdoc/>
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public override string GetDisplayKey(AnimancerState state) => $"[{state.Index}] {_Thresholds[state.Index]}";
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/************************************************************************************************************************/
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/// <inheritdoc/>
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protected override void AppendDetails(StringBuilder text, string separator)
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{
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text.Append(separator);
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text.Append($"{nameof(Parameter)}: ");
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AppendParameter(text, Parameter);
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text.Append(separator).Append("Thresholds: ");
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var thresholdCount = Math.Min(ChildCapacity, _Thresholds.Length);
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for (int i = 0; i < thresholdCount; i++)
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{
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if (i > 0)
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text.Append(", ");
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AppendParameter(text, _Thresholds[i]);
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}
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base.AppendDetails(text, separator);
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}
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/************************************************************************************************************************/
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/// <summary>Appends the `parameter` in a viewer-friendly format.</summary>
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public virtual void AppendParameter(StringBuilder description, TParameter parameter)
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{
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description.Append(parameter);
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}
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/************************************************************************************************************************/
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#endregion
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/************************************************************************************************************************/
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}
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}
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