import { WrapAroundEnding, ZeroCurvatureEnding, ZeroSlopeEnding, LoopPingPong, LoopOnce, LoopRepeat, NormalAnimationBlendMode, AdditiveAnimationBlendMode } from '../constants.js';
class AnimationAction {
constructor( mixer, clip, localRoot = null, blendMode = clip.blendMode ) {
this._mixer = mixer;
this._clip = clip;
this._localRoot = localRoot;
this.blendMode = blendMode;
const tracks = clip.tracks,
nTracks = tracks.length,
interpolants = new Array( nTracks );
const interpolantSettings = {
endingStart: ZeroCurvatureEnding,
endingEnd: ZeroCurvatureEnding
};
for ( let i = 0; i !== nTracks; ++ i ) {
const interpolant = tracks[ i ].createInterpolant( null );
interpolants[ i ] = interpolant;
interpolant.settings = interpolantSettings;
}
this._interpolantSettings = interpolantSettings;
this._interpolants = interpolants; // bound by the mixer
// inside: PropertyMixer (managed by the mixer)
this._propertyBindings = new Array( nTracks );
this._cacheIndex = null; // for the memory manager
this._byClipCacheIndex = null; // for the memory manager
this._timeScaleInterpolant = null;
this._weightInterpolant = null;
this.loop = LoopRepeat;
this._loopCount = - 1;
// global mixer time when the action is to be started
// it's set back to 'null' upon start of the action
this._startTime = null;
// scaled local time of the action
// gets clamped or wrapped to 0..clip.duration according to loop
this.time = 0;
this.timeScale = 1;
this._effectiveTimeScale = 1;
this.weight = 1;
this._effectiveWeight = 1;
this.repetitions = Infinity; // no. of repetitions when looping
this.paused = false; // true -> zero effective time scale
this.enabled = true; // false -> zero effective weight
this.clampWhenFinished = false;// keep feeding the last frame?
this.zeroSlopeAtStart = true;// for smooth interpolation w/o separate
this.zeroSlopeAtEnd = true;// clips for start, loop and end
}
// State & Scheduling
play() {
this._mixer._activateAction( this );
return this;
}
stop() {
this._mixer._deactivateAction( this );
return this.reset();
}
reset() {
this.paused = false;
this.enabled = true;
this.time = 0; // restart clip
this._loopCount = - 1;// forget previous loops
this._startTime = null;// forget scheduling
return this.stopFading().stopWarping();
}
isRunning() {
return this.enabled && ! this.paused && this.timeScale !== 0 &&
this._startTime === null && this._mixer._isActiveAction( this );
}
// return true when play has been called
isScheduled() {
return this._mixer._isActiveAction( this );
}
startAt( time ) {
this._startTime = time;
return this;
}
setLoop( mode, repetitions ) {
this.loop = mode;
this.repetitions = repetitions;
return this;
}
// Weight
// set the weight stopping any scheduled fading
// although .enabled = false yields an effective weight of zero, this
// method does *not* change .enabled, because it would be confusing
setEffectiveWeight( weight ) {
this.weight = weight;
// note: same logic as when updated at runtime
this._effectiveWeight = this.enabled ? weight : 0;
return this.stopFading();
}
// return the weight considering fading and .enabled
getEffectiveWeight() {
return this._effectiveWeight;
}
fadeIn( duration ) {
return this._scheduleFading( duration, 0, 1 );
}
fadeOut( duration ) {
return this._scheduleFading( duration, 1, 0 );
}
crossFadeFrom( fadeOutAction, duration, warp ) {
fadeOutAction.fadeOut( duration );
this.fadeIn( duration );
if ( warp ) {
const fadeInDuration = this._clip.duration,
fadeOutDuration = fadeOutAction._clip.duration,
startEndRatio = fadeOutDuration / fadeInDuration,
endStartRatio = fadeInDuration / fadeOutDuration;
fadeOutAction.warp( 1.0, startEndRatio, duration );
this.warp( endStartRatio, 1.0, duration );
}
return this;
}
crossFadeTo( fadeInAction, duration, warp ) {
return fadeInAction.crossFadeFrom( this, duration, warp );
}
stopFading() {
const weightInterpolant = this._weightInterpolant;
if ( weightInterpolant !== null ) {
this._weightInterpolant = null;
this._mixer._takeBackControlInterpolant( weightInterpolant );
}
return this;
}
// Time Scale Control
// set the time scale stopping any scheduled warping
// although .paused = true yields an effective time scale of zero, this
// method does *not* change .paused, because it would be confusing
setEffectiveTimeScale( timeScale ) {
this.timeScale = timeScale;
this._effectiveTimeScale = this.paused ? 0 : timeScale;
return this.stopWarping();
}
// return the time scale considering warping and .paused
getEffectiveTimeScale() {
return this._effectiveTimeScale;
}
setDuration( duration ) {
this.timeScale = this._clip.duration / duration;
return this.stopWarping();
}
syncWith( action ) {
this.time = action.time;
this.timeScale = action.timeScale;
return this.stopWarping();
}
halt( duration ) {
return this.warp( this._effectiveTimeScale, 0, duration );
}
warp( startTimeScale, endTimeScale, duration ) {
const mixer = this._mixer,
now = mixer.time,
timeScale = this.timeScale;
let interpolant = this._timeScaleInterpolant;
if ( interpolant === null ) {
interpolant = mixer._lendControlInterpolant();
this._timeScaleInterpolant = interpolant;
}
const times = interpolant.parameterPositions,
values = interpolant.sampleValues;
times[ 0 ] = now;
times[ 1 ] = now + duration;
values[ 0 ] = startTimeScale / timeScale;
values[ 1 ] = endTimeScale / timeScale;
return this;
}
stopWarping() {
const timeScaleInterpolant = this._timeScaleInterpolant;
if ( timeScaleInterpolant !== null ) {
this._timeScaleInterpolant = null;
this._mixer._takeBackControlInterpolant( timeScaleInterpolant );
}
return this;
}
// Object Accessors
getMixer() {
return this._mixer;
}
getClip() {
return this._clip;
}
getRoot() {
return this._localRoot || this._mixer._root;
}
// Interna
_update( time, deltaTime, timeDirection, accuIndex ) {
// called by the mixer
if ( ! this.enabled ) {
// call ._updateWeight() to update ._effectiveWeight
this._updateWeight( time );
return;
}
const startTime = this._startTime;
if ( startTime !== null ) {
// check for scheduled start of action
const timeRunning = ( time - startTime ) * timeDirection;
if ( timeRunning < 0 || timeDirection === 0 ) {
deltaTime = 0;
} else {
this._startTime = null; // unschedule
deltaTime = timeDirection * timeRunning;
}
}
// apply time scale and advance time
deltaTime *= this._updateTimeScale( time );
const clipTime = this._updateTime( deltaTime );
// note: _updateTime may disable the action resulting in
// an effective weight of 0
const weight = this._updateWeight( time );
if ( weight > 0 ) {
const interpolants = this._interpolants;
const propertyMixers = this._propertyBindings;
switch ( this.blendMode ) {
case AdditiveAnimationBlendMode:
for ( let j = 0, m = interpolants.length; j !== m; ++ j ) {
interpolants[ j ].evaluate( clipTime );
propertyMixers[ j ].accumulateAdditive( weight );
}
break;
case NormalAnimationBlendMode:
default:
for ( let j = 0, m = interpolants.length; j !== m; ++ j ) {
interpolants[ j ].evaluate( clipTime );
propertyMixers[ j ].accumulate( accuIndex, weight );
}
}
}
}
_updateWeight( time ) {
let weight = 0;
if ( this.enabled ) {
weight = this.weight;
const interpolant = this._weightInterpolant;
if ( interpolant !== null ) {
const interpolantValue = interpolant.evaluate( time )[ 0 ];
weight *= interpolantValue;
if ( time > interpolant.parameterPositions[ 1 ] ) {
this.stopFading();
if ( interpolantValue === 0 ) {
// faded out, disable
this.enabled = false;
}
}
}
}
this._effectiveWeight = weight;
return weight;
}
_updateTimeScale( time ) {
let timeScale = 0;
if ( ! this.paused ) {
timeScale = this.timeScale;
const interpolant = this._timeScaleInterpolant;
if ( interpolant !== null ) {
const interpolantValue = interpolant.evaluate( time )[ 0 ];
timeScale *= interpolantValue;
if ( time > interpolant.parameterPositions[ 1 ] ) {
this.stopWarping();
if ( timeScale === 0 ) {
// motion has halted, pause
this.paused = true;
} else {
// warp done - apply final time scale
this.timeScale = timeScale;
}
}
}
}
this._effectiveTimeScale = timeScale;
return timeScale;
}
_updateTime( deltaTime ) {
const duration = this._clip.duration;
const loop = this.loop;
let time = this.time + deltaTime;
let loopCount = this._loopCount;
const pingPong = ( loop === LoopPingPong );
if ( deltaTime === 0 ) {
if ( loopCount === - 1 ) return time;
return ( pingPong && ( loopCount & 1 ) === 1 ) ? duration - time : time;
}
if ( loop === LoopOnce ) {
if ( loopCount === - 1 ) {
// just started
this._loopCount = 0;
this._setEndings( true, true, false );
}
handle_stop: {
if ( time >= duration ) {
time = duration;
} else if ( time < 0 ) {
time = 0;
} else {
this.time = time;
break handle_stop;
}
if ( this.clampWhenFinished ) this.paused = true;
else this.enabled = false;
this.time = time;
this._mixer.dispatchEvent( {
type: 'finished', action: this,
direction: deltaTime < 0 ? - 1 : 1
} );
}
} else { // repetitive Repeat or PingPong
if ( loopCount === - 1 ) {
// just started
if ( deltaTime >= 0 ) {
loopCount = 0;
this._setEndings( true, this.repetitions === 0, pingPong );
} else {
// when looping in reverse direction, the initial
// transition through zero counts as a repetition,
// so leave loopCount at -1
this._setEndings( this.repetitions === 0, true, pingPong );
}
}
if ( time >= duration || time < 0 ) {
// wrap around
const loopDelta = Math.floor( time / duration ); // signed
time -= duration * loopDelta;
loopCount += Math.abs( loopDelta );
const pending = this.repetitions - loopCount;
if ( pending <= 0 ) {
// have to stop (switch state, clamp time, fire event)
if ( this.clampWhenFinished ) this.paused = true;
else this.enabled = false;
time = deltaTime > 0 ? duration : 0;
this.time = time;
this._mixer.dispatchEvent( {
type: 'finished', action: this,
direction: deltaTime > 0 ? 1 : - 1
} );
} else {
// keep running
if ( pending === 1 ) {
// entering the last round
const atStart = deltaTime < 0;
this._setEndings( atStart, ! atStart, pingPong );
} else {
this._setEndings( false, false, pingPong );
}
this._loopCount = loopCount;
this.time = time;
this._mixer.dispatchEvent( {
type: 'loop', action: this, loopDelta: loopDelta
} );
}
} else {
this.time = time;
}
if ( pingPong && ( loopCount & 1 ) === 1 ) {
// invert time for the "pong round"
return duration - time;
}
}
return time;
}
_setEndings( atStart, atEnd, pingPong ) {
const settings = this._interpolantSettings;
if ( pingPong ) {
settings.endingStart = ZeroSlopeEnding;
settings.endingEnd = ZeroSlopeEnding;
} else {
// assuming for LoopOnce atStart == atEnd == true
if ( atStart ) {
settings.endingStart = this.zeroSlopeAtStart ? ZeroSlopeEnding : ZeroCurvatureEnding;
} else {
settings.endingStart = WrapAroundEnding;
}
if ( atEnd ) {
settings.endingEnd = this.zeroSlopeAtEnd ? ZeroSlopeEnding : ZeroCurvatureEnding;
} else {
settings.endingEnd = WrapAroundEnding;
}
}
}
_scheduleFading( duration, weightNow, weightThen ) {
const mixer = this._mixer, now = mixer.time;
let interpolant = this._weightInterpolant;
if ( interpolant === null ) {
interpolant = mixer._lendControlInterpolant();
this._weightInterpolant = interpolant;
}
const times = interpolant.parameterPositions,
values = interpolant.sampleValues;
times[ 0 ] = now;
values[ 0 ] = weightNow;
times[ 1 ] = now + duration;
values[ 1 ] = weightThen;
return this;
}
}
export { AnimationAction };
