445 lines
20 KiB
C#
445 lines
20 KiB
C#
using System;
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using System.Collections.Generic;
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using Cinemachine.Utility;
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using UnityEngine;
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namespace Cinemachine
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{
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/// <summary>
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/// Property applied to CinemachineImpulseManager.EnvelopeDefinition.
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/// Used for custom drawing in the inspector. This attribute is obsolete and not used.
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/// </summary>
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public sealed class CinemachineImpulseEnvelopePropertyAttribute : PropertyAttribute {}
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/// <summary>
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/// Property applied to CinemachineImpulseManager Channels.
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/// Used for custom drawing in the inspector.
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/// </summary>
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public sealed class CinemachineImpulseChannelPropertyAttribute : PropertyAttribute {}
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/// <summary>
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/// This is a singleton object that manages all Impulse Events generated by the Cinemachine
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/// Impulse module. This singleton owns and manages all ImpulseEvent objectss.
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/// </summary>
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[DocumentationSorting(DocumentationSortingAttribute.Level.API)]
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public class CinemachineImpulseManager
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{
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private CinemachineImpulseManager() {}
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private static CinemachineImpulseManager sInstance = null;
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/// <summary>Get the singleton instance</summary>
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public static CinemachineImpulseManager Instance
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{
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get
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{
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if (sInstance == null)
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sInstance = new CinemachineImpulseManager();
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return sInstance;
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}
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}
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[RuntimeInitializeOnLoadMethod]
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static void InitializeModule()
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{
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if (sInstance != null)
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sInstance.Clear();
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}
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const float Epsilon = UnityVectorExtensions.Epsilon;
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/// <summary>This defines the time-envelope of the signal.
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/// Thie raw signal will be scaled to fit inside the envelope.</summary>
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[Serializable]
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public struct EnvelopeDefinition
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{
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/// <summary>Normalized curve defining the shape of the start of the envelope.</summary>
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[Tooltip("Normalized curve defining the shape of the start of the envelope. If blank a default curve will be used")]
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public AnimationCurve m_AttackShape;
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/// <summary>Normalized curve defining the shape of the end of the envelope.</summary>
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[Tooltip("Normalized curve defining the shape of the end of the envelope. If blank a default curve will be used")]
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public AnimationCurve m_DecayShape;
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/// <summary>Duration in seconds of the attack. Attack curve will be scaled to fit. Must be >= 0</summary>
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[Tooltip("Duration in seconds of the attack. Attack curve will be scaled to fit. Must be >= 0.")]
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public float m_AttackTime; // Must be >= 0
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/// <summary>Duration in seconds of the central fully-scaled part of the envelope. Must be >= 0.</summary>
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[Tooltip("Duration in seconds of the central fully-scaled part of the envelope. Must be >= 0.")]
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public float m_SustainTime; // Must be >= 0
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/// <summary>Duration in seconds of the decay. Decay curve will be scaled to fit. Must be >= 0.</summary>
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[Tooltip("Duration in seconds of the decay. Decay curve will be scaled to fit. Must be >= 0.")]
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public float m_DecayTime; // Must be >= 0
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/// <summary>If checked, signal amplitude scaling will also be applied to the time envelope of the signal. Bigger signals will last longer</summary>
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[Tooltip("If checked, signal amplitude scaling will also be applied to the time envelope of the signal. Stronger signals will last longer.")]
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public bool m_ScaleWithImpact;
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/// <summary>If true, then duration is infinite.</summary>
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[Tooltip("If true, then duration is infinite.")]
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public bool m_HoldForever;
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/// <summary>Get an envelope with default values.</summary>
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/// <returns>An event with default values</returns>
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public static EnvelopeDefinition Default()
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{
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return new EnvelopeDefinition { m_DecayTime = 0.7f, m_SustainTime = 0.2f, m_ScaleWithImpact = true };
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}
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/// <summary>Duration of the envelope, in seconds. If negative, then duration is infinite.</summary>
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public float Duration
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{
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get
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{
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if (m_HoldForever)
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return -1;
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return m_AttackTime + m_SustainTime + m_DecayTime;
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}
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}
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/// <summary>
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/// Get the value of the tenvelope at a given time relative to the envelope start.
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/// </summary>
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/// <param name="offset">Time in seconds from the envelope start</param>
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/// <returns>Envelope amplitude. This will range from 0...1</returns>
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public float GetValueAt(float offset)
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{
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if (offset >= 0)
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{
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if (offset < m_AttackTime && m_AttackTime > Epsilon)
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{
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if (m_AttackShape == null || m_AttackShape.length < 2)
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return Damper.Damp(1, m_AttackTime, offset);
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return m_AttackShape.Evaluate(offset / m_AttackTime);
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}
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offset -= m_AttackTime;
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if (m_HoldForever || offset < m_SustainTime)
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return 1;
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offset -= m_SustainTime;
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if (offset < m_DecayTime && m_DecayTime > Epsilon)
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{
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if (m_DecayShape == null || m_DecayShape.length < 2)
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return 1 - Damper.Damp(1, m_DecayTime, offset);
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return m_DecayShape.Evaluate(offset / m_DecayTime);
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}
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}
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return 0;
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}
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/// <summary>
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/// Change the envelope so that it stops at a specific offset from its start time.
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/// Use this to extend or cut short an existing envelope, while respecting the
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/// attack and decay as much as possible.
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/// </summary>
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/// <param name="offset">When to stop the envelope</param>
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/// <param name="forceNoDecay">If true, enevlope will not decay, but cut off instantly</param>
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public void ChangeStopTime(float offset, bool forceNoDecay)
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{
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if (offset < 0)
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offset = 0;
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if (offset < m_AttackTime)
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m_AttackTime = 0; // How to prevent pop? GML
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m_SustainTime = offset - m_AttackTime;
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if (forceNoDecay)
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m_DecayTime = 0;
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}
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/// <summary>
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/// Set the envelop times to 0 and the shapes to default.
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/// </summary>
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public void Clear()
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{
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m_AttackShape = m_DecayShape = null;
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m_AttackTime = m_SustainTime = m_DecayTime = 0;
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}
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/// <summary>
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/// Call from OnValidate to ensure that envelope values are sane
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/// </summary>
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public void Validate()
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{
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m_AttackTime = Mathf.Max(0, m_AttackTime);
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m_DecayTime = Mathf.Max(0, m_DecayTime);
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m_SustainTime = Mathf.Max(0, m_SustainTime);
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}
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}
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internal static float EvaluateDissipationScale(float spread, float normalizedDistance)
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{
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const float kMin = -0.8f;
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const float kMax = 0.8f;
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var b = kMin + (kMax - kMin) * (1f - spread);
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b = (1f - b) * 0.5f;
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var t = Mathf.Clamp01(normalizedDistance) / ((((1f/Mathf.Clamp01(b)) - 2f) * (1f - normalizedDistance)) + 1f);
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return 1 - SplineHelpers.Bezier1(t, 0, 0, 1, 1);
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}
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/// <summary>Describes an event that generates an impulse signal on one or more channels.
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/// The event has a location in space, a start time, a duration, and a signal. The signal
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/// will dissipate as the distance from the event location increases.</summary>
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public class ImpulseEvent
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{
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/// <summary>Start time of the event.</summary>
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public float m_StartTime;
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/// <summary>Time-envelope of the signal.</summary>
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public EnvelopeDefinition m_Envelope;
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/// <summary>Raw signal source. The ouput of this will be scaled to fit in the envelope.</summary>
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public ISignalSource6D m_SignalSource;
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/// <summary>Worldspace origin of the signal.</summary>
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public Vector3 m_Position;
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/// <summary>Radius around the signal origin that has full signal value. Distance dissipation begins after this distance.</summary>
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public float m_Radius;
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/// <summary>How the signal behaves as the listener moves away from the origin.</summary>
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public enum DirectionMode
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{
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/// <summary>Signal direction remains constant everywhere.</summary>
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Fixed,
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/// <summary>Signal is rotated in the direction of the source.</summary>
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RotateTowardSource
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}
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/// <summary>How the signal direction behaves as the listener moves away from the source.</summary>
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public DirectionMode m_DirectionMode = DirectionMode.Fixed;
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/// <summary>Channels on which this event will broadcast its signal.</summary>
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public int m_Channel;
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/// <summary>How the signal dissipates with distance.</summary>
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public enum DissipationMode
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{
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/// <summary>Simple linear interpolation to zero over the dissipation distance.</summary>
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LinearDecay,
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/// <summary>Ease-in-ease-out dissipation over the dissipation distance.</summary>
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SoftDecay,
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/// <summary>Half-life decay, hard out from full and ease into 0 over the dissipation distance.</summary>
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ExponentialDecay
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}
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/// <summary>How the signal dissipates with distance.</summary>
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public DissipationMode m_DissipationMode;
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/// <summary>Distance over which the dissipation occurs. Must be >= 0.</summary>
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public float m_DissipationDistance;
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/// <summary>
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/// How the effect fades with distance. 0 = no dissipation, 1 = rapid dissipation, -1 = off (legacy mode)
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/// </summary>
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public float m_CustomDissipation;
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/// <summary>
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/// The speed (m/s) at which the impulse propagates through space. High speeds
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/// allow listeners to react instantaneously, while slower speeds allow listeres in the
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/// scene to react as if to a wave spreading from the source.
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/// </summary>
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public float m_PropagationSpeed;
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/// <summary>Returns true if the event is no longer generating a signal because its time has expired</summary>
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public bool Expired
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{
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get
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{
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var d = m_Envelope.Duration;
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var maxDistance = m_Radius + m_DissipationDistance;
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float time = Instance.CurrentTime - maxDistance / Mathf.Max(1, m_PropagationSpeed);
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return d > 0 && m_StartTime + d <= time;
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}
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}
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/// <summary>Cancel the event at the supplied time</summary>
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/// <param name="time">The time at which to cancel the event</param>
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/// <param name="forceNoDecay">If true, event will be cut immediately at the time,
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/// otherwise its envelope's decay curve will begin at the cancel time</param>
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public void Cancel(float time, bool forceNoDecay)
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{
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m_Envelope.m_HoldForever = false;
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m_Envelope.ChangeStopTime(time - m_StartTime, forceNoDecay);
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}
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/// <summary>Calculate the the decay applicable at a given distance from the impact point</summary>
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/// <param name="distance">The distance over which to perform the decay</param>
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/// <returns>Scale factor 0...1</returns>
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public float DistanceDecay(float distance)
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{
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float radius = Mathf.Max(m_Radius, 0);
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if (distance < radius)
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return 1;
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distance -= radius;
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if (distance >= m_DissipationDistance)
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return 0;
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if (m_CustomDissipation >= 0)
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return EvaluateDissipationScale(m_CustomDissipation, distance / m_DissipationDistance);
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switch (m_DissipationMode)
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{
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default:
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case DissipationMode.LinearDecay:
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return Mathf.Lerp(1, 0, distance / m_DissipationDistance);
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case DissipationMode.SoftDecay:
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return 0.5f * (1 + Mathf.Cos(Mathf.PI * (distance / m_DissipationDistance)));
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case DissipationMode.ExponentialDecay:
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return 1 - Damper.Damp(1, m_DissipationDistance, distance);
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}
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}
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/// <summary>Get the signal that a listener at a given position would perceive</summary>
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/// <param name="listenerPosition">The listener's position in world space</param>
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/// <param name="use2D">True if distance calculation should ignore Z</param>
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/// <param name="pos">The position impulse signal</param>
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/// <param name="rot">The rotation impulse signal</param>
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/// <returns>true if non-trivial signal is returned</returns>
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public bool GetDecayedSignal(
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Vector3 listenerPosition, bool use2D, out Vector3 pos, out Quaternion rot)
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{
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if (m_SignalSource != null)
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{
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float distance = use2D ? Vector2.Distance(listenerPosition, m_Position)
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: Vector3.Distance(listenerPosition, m_Position);
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float time = Instance.CurrentTime - m_StartTime
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- distance / Mathf.Max(1, m_PropagationSpeed);
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float scale = m_Envelope.GetValueAt(time) * DistanceDecay(distance);
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if (scale != 0)
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{
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m_SignalSource.GetSignal(time, out pos, out rot);
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pos *= scale;
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rot = Quaternion.SlerpUnclamped(Quaternion.identity, rot, scale);
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if (m_DirectionMode == DirectionMode.RotateTowardSource && distance > Epsilon)
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{
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Quaternion q = Quaternion.FromToRotation(Vector3.up, listenerPosition - m_Position);
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if (m_Radius > Epsilon)
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{
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float t = Mathf.Clamp01(distance / m_Radius);
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q = Quaternion.Slerp(
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q, Quaternion.identity, Mathf.Cos(Mathf.PI * t / 2));
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}
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pos = q * pos;
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}
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return true;
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}
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}
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pos = Vector3.zero;
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rot = Quaternion.identity;
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return false;
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}
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/// <summary>Reset the event to a default state</summary>
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public void Clear()
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{
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m_Envelope.Clear();
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m_StartTime = 0;
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m_SignalSource = null;
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m_Position = Vector3.zero;
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m_Channel = 0;
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m_Radius = 0;
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m_DissipationDistance = 100;
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m_DissipationMode = DissipationMode.ExponentialDecay;
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m_CustomDissipation = -1;
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}
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/// <summary>Don't create them yourself. Use CinemachineImpulseManager.NewImpulseEvent().</summary>
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internal ImpulseEvent() {}
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}
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List<ImpulseEvent> m_ExpiredEvents;
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List<ImpulseEvent> m_ActiveEvents;
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/// <summary>Get the signal perceived by a listener at a geven location</summary>
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/// <param name="listenerLocation">Where the listener is, in world coords</param>
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/// <param name="distance2D">True if distance calculation should ignore Z</param>
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/// <param name="channelMask">Only Impulse signals on channels in this mask will be considered</param>
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/// <param name="pos">The combined position impulse signal resulting from all signals active on the specified channels</param>
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/// <param name="rot">The combined rotation impulse signal resulting from all signals active on the specified channels</param>
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/// <returns>true if non-trivial signal is returned</returns>
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public bool GetImpulseAt(
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Vector3 listenerLocation, bool distance2D, int channelMask,
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out Vector3 pos, out Quaternion rot)
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{
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bool nontrivialResult = false;
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pos = Vector3.zero;
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rot = Quaternion.identity;
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if (m_ActiveEvents != null)
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{
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for (int i = m_ActiveEvents.Count - 1; i >= 0; --i)
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{
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ImpulseEvent e = m_ActiveEvents[i];
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// Prune invalid or expired events
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if (e == null || e.Expired)
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{
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m_ActiveEvents.RemoveAt(i);
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if (e != null)
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{
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// Recycle it
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if (m_ExpiredEvents == null)
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m_ExpiredEvents = new List<ImpulseEvent>();
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e.Clear();
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m_ExpiredEvents.Add(e);
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}
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}
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else if ((e.m_Channel & channelMask) != 0)
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{
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Vector3 pos0 = Vector3.zero;
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Quaternion rot0 = Quaternion.identity;
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if (e.GetDecayedSignal(listenerLocation, distance2D, out pos0, out rot0))
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{
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nontrivialResult = true;
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pos += pos0;
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rot *= rot0;
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}
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}
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}
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}
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return nontrivialResult;
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}
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/// <summary>Set this to ignore time scaling so impulses can progress while the game is paused</summary>
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public bool IgnoreTimeScale;
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/// <summary>
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/// This is the Impulse system's current time.
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/// Takes into accoount whether impulse is ignoring time scale.
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/// </summary>
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public float CurrentTime => IgnoreTimeScale ? Time.realtimeSinceStartup : CinemachineCore.CurrentTime;
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/// <summary>Get a new ImpulseEvent</summary>
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/// <returns>A newly-created impulse event. May be recycled from expired events</returns>
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public ImpulseEvent NewImpulseEvent()
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{
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ImpulseEvent e;
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if (m_ExpiredEvents == null || m_ExpiredEvents.Count == 0)
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return new ImpulseEvent() { m_CustomDissipation = -1 };
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e = m_ExpiredEvents[m_ExpiredEvents.Count-1];
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m_ExpiredEvents.RemoveAt(m_ExpiredEvents.Count-1);
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return e;
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}
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/// <summary>Activate an impulse event, so that it may begin broadcasting its signal</summary>
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/// Events will be automatically removed after they expire.
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/// You can tweak the ImpulseEvent fields dynamically if you keep a pointer to it.
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/// <param name="e">The event to add to the current active events</param>
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public void AddImpulseEvent(ImpulseEvent e)
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{
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if (m_ActiveEvents == null)
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m_ActiveEvents = new List<ImpulseEvent>();
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if (e != null)
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{
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e.m_StartTime = CurrentTime;
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m_ActiveEvents.Add(e);
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}
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}
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/// <summary>Immediately terminate all active impulse signals</summary>
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public void Clear()
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{
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if (m_ActiveEvents != null)
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{
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for (int i = 0; i < m_ActiveEvents.Count; ++i)
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m_ActiveEvents[i].Clear();
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m_ActiveEvents.Clear();
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}
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}
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}
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}
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