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https://github.com/ninjamuffin99/Funkin.git
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Updates and fixes to Conductor for use with changing BPMs.
This commit is contained in:
EliteMasterEric
parent
93f653969a
commit
956277ff4e
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@ -1,23 +1,18 @@
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package funkin;
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import funkin.play.song.SongData.SongTimeChange;
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import funkin.util.Constants;
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import flixel.util.FlxSignal;
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import flixel.math.FlxMath;
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import funkin.SongLoad.SwagSong;
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import funkin.play.song.Song.SongDifficulty;
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typedef BPMChangeEvent =
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{
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var stepTime:Int;
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var songTime:Float;
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var bpm:Float;
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}
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import funkin.play.song.SongData.SongTimeChange;
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/**
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* A global source of truth for timing information.
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* A core class which handles musical timing throughout the game,
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* both in gameplay and in menus.
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*/
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class Conductor
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{
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static final STEPS_PER_BEAT:Int = 4;
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// onBeatHit is called every quarter note
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// onStepHit is called every sixteenth note
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// 4/4 = 4 beats per measure = 16 steps per measure
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@ -33,138 +28,6 @@ class Conductor
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// 60 BPM = 240 sixteenth notes per minute = 4 onStepHit per second
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// 7/8 = 3.5 beats per measure = 14 steps per measure
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/**
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* The current position in the song in milliseconds.
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* Updated every frame based on the audio position.
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*/
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public static var songPosition:Float;
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/**
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* Beats per minute of the current song at the current time.
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*/
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public static var bpm(get, null):Float;
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static function get_bpm():Float
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{
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if (bpmOverride != null) return bpmOverride;
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if (currentTimeChange == null) return 100;
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return currentTimeChange.bpm;
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}
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static var bpmOverride:Null<Float> = null;
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/**
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* Current position in the song, in whole measures.
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*/
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public static var currentMeasure(default, null):Int;
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/**
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* Current position in the song, in whole beats.
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**/
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public static var currentBeat(default, null):Int;
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/**
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* Current position in the song, in whole steps.
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*/
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public static var currentStep(default, null):Int;
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/**
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* Current position in the song, in steps and fractions of a step.
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*/
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public static var currentStepTime(default, null):Float;
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/**
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* Duration of a measure in milliseconds. Calculated based on bpm.
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*/
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public static var measureLengthMs(get, null):Float;
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static function get_measureLengthMs():Float
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{
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return beatLengthMs * timeSignatureNumerator;
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}
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/**
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* Duration of a beat (quarter note) in milliseconds. Calculated based on bpm.
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*/
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public static var beatLengthMs(get, null):Float;
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static function get_beatLengthMs():Float
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{
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// Tied directly to BPM.
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return ((60 / bpm) * 1000);
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}
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/**
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* Duration of a step (sixteenth) in milliseconds. Calculated based on bpm.
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*/
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public static var stepLengthMs(get, null):Float;
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static function get_stepLengthMs():Float
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{
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return beatLengthMs / STEPS_PER_BEAT;
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}
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/**
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* The numerator of the current time signature (number of notes in a measure)
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*/
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public static var timeSignatureNumerator(get, null):Int;
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static function get_timeSignatureNumerator():Int
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{
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if (currentTimeChange == null) return 4;
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return currentTimeChange.timeSignatureNum;
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}
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/**
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* The numerator of the current time signature (length of notes in a measure)
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*/
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public static var timeSignatureDenominator(get, null):Int;
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static function get_timeSignatureDenominator():Int
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{
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if (currentTimeChange == null) return 4;
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return currentTimeChange.timeSignatureDen;
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}
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public static var offset:Float = 0;
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// TODO: What's the difference between visualOffset and audioOffset?
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public static var visualOffset:Float = 0;
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public static var audioOffset:Float = 0;
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//
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// Signals
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//
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/**
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* Signal that is dispatched every measure.
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* At 120 BPM 4/4, this is dispatched every 2 seconds.
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* At 120 BPM 3/4, this is dispatched every 1.5 seconds.
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*/
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public static var measureHit(default, null):FlxSignal = new FlxSignal();
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/**
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* Signal that is dispatched every beat.
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* At 120 BPM 4/4, this is dispatched every 0.5 seconds.
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* At 120 BPM 3/4, this is dispatched every 0.5 seconds.
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*/
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public static var beatHit(default, null):FlxSignal = new FlxSignal();
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/**
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* Signal that is dispatched when a step is hit.
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* At 120 BPM 4/4, this is dispatched every 0.125 seconds.
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* At 120 BPM 3/4, this is dispatched every 0.125 seconds.
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*/
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public static var stepHit(default, null):FlxSignal = new FlxSignal();
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//
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// Internal Variables
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//
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/**
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* The list of time changes in the song.
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* There should be at least one time change (at the beginning of the song) to define the BPM.
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@ -176,11 +39,104 @@ class Conductor
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*/
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static var currentTimeChange:SongTimeChange;
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public static var lastSongPos:Float;
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/**
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* The current position in the song in milliseconds.
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* Updated every frame based on the audio position.
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*/
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public static var songPosition:Float = 0;
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/**
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* The number of beats (whole notes) in a measure.
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* Beats per minute of the current song at the current time.
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*/
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public static var bpm(get, null):Float;
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static function get_bpm():Float
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{
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if (bpmOverride != null) return bpmOverride;
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if (currentTimeChange == null) return Constants.DEFAULT_BPM;
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return currentTimeChange.bpm;
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}
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/**
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* The current value set by `forceBPM`.
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* If false, BPM is determined by time changes.
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*/
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static var bpmOverride:Null<Float> = null;
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/**
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* Duration of a measure in milliseconds. Calculated based on bpm.
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*/
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public static var measureLengthMs(get, null):Float;
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static function get_measureLengthMs():Float
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{
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return crochet * timeSignatureNumerator;
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}
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/**
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* Duration of a beat in milliseconds. Calculated based on bpm.
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*/
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public static var crochet(get, null):Float;
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static function get_crochet():Float
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{
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return ((Constants.SECS_PER_MIN / bpm) * Constants.MS_PER_SEC);
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}
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/**
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* Duration of a step (quarter) in milliseconds. Calculated based on bpm.
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*/
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public static var stepCrochet(get, null):Float;
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static function get_stepCrochet():Float
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{
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return crochet / timeSignatureNumerator;
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}
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public static var timeSignatureNumerator(get, null):Int;
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static function get_timeSignatureNumerator():Int
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{
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if (currentTimeChange == null) return Constants.DEFAULT_TIME_SIGNATURE_NUM;
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return currentTimeChange.timeSignatureNum;
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}
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public static var timeSignatureDenominator(get, null):Int;
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static function get_timeSignatureDenominator():Int
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{
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if (currentTimeChange == null) return Constants.DEFAULT_TIME_SIGNATURE_DEN;
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return currentTimeChange.timeSignatureDen;
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}
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/**
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* Current position in the song, in beats.
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**/
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public static var currentBeat(default, null):Int;
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/**
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* Current position in the song, in steps.
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*/
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public static var currentStep(default, null):Int;
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/**
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* Current position in the song, in steps and fractions of a step.
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*/
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public static var currentStepTime(default, null):Float;
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public static var beatHit(default, null):FlxSignal = new FlxSignal();
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public static var stepHit(default, null):FlxSignal = new FlxSignal();
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public static var lastSongPos:Float;
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public static var visualOffset:Float = 0;
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public static var audioOffset:Float = 0;
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public static var offset:Float = 0;
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// TODO: Add code to update this.
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public static var beatsPerMeasure(get, null):Int;
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static function get_beatsPerMeasure():Int
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@ -188,17 +144,16 @@ class Conductor
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return timeSignatureNumerator;
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}
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/**
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* The number of steps (quarter-notes) in a measure.
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*/
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public static var stepsPerMeasure(get, null):Int;
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static function get_stepsPerMeasure():Int
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{
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// This is always 4, b
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return timeSignatureNumerator * 4;
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// Is this always x4?
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return timeSignatureNumerator * Constants.STEPS_PER_BEAT;
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}
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function new() {}
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/**
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* Forcibly defines the current BPM of the song.
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* Useful for things like the chart editor that need to manipulate BPM in real time.
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@ -208,16 +163,11 @@ class Conductor
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* WARNING: Avoid this for things like setting the BPM of the title screen music,
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* you should have a metadata file for it instead.
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*/
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public static function forceBPM(?bpm:Float = null):Void
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public static function forceBPM(?bpm:Float = null)
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{
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if (bpm != null)
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{
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trace('[CONDUCTOR] Forcing BPM to ' + bpm);
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}
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if (bpm != null) trace('[CONDUCTOR] Forcing BPM to ' + bpm);
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else
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{
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trace('[CONDUCTOR] Resetting BPM to default');
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}
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Conductor.bpmOverride = bpm;
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}
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@ -228,13 +178,12 @@ class Conductor
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* @param songPosition The current position in the song in milliseconds.
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* Leave blank to use the FlxG.sound.music position.
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*/
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public static function update(songPosition:Float = null):Void
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public static function update(songPosition:Float = null)
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{
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if (songPosition == null) songPosition = (FlxG.sound.music != null) ? FlxG.sound.music.time + Conductor.offset : 0.0;
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var oldMeasure:Int = currentMeasure;
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var oldBeat:Int = currentBeat;
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var oldStep:Int = currentStep;
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var oldBeat = currentBeat;
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var oldStep = currentStep;
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Conductor.songPosition = songPosition;
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@ -252,14 +201,15 @@ class Conductor
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}
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else if (currentTimeChange != null)
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{
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currentStepTime = (currentTimeChange.beatTime * 4) + (songPosition - currentTimeChange.timeStamp) / stepLengthMs;
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// roundDecimal prevents representing 8 as 7.9999999
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currentStepTime = FlxMath.roundDecimal((currentTimeChange.beatTime * 4) + (songPosition - currentTimeChange.timeStamp) / stepCrochet, 6);
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currentStep = Math.floor(currentStepTime);
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currentBeat = Math.floor(currentStep / 4);
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}
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else
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{
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// Assume a constant BPM equal to the forced value.
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currentStepTime = (songPosition / stepLengthMs);
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currentStepTime = (songPosition / stepCrochet);
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currentStep = Math.floor(currentStepTime);
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currentBeat = Math.floor(currentStep / 4);
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}
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@ -274,40 +224,61 @@ class Conductor
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{
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beatHit.dispatch();
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}
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if (currentMeasure != oldMeasure)
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{
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measureHit.dispatch();
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}
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}
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public static function mapTimeChanges(songTimeChanges:Array<SongTimeChange>):Void
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public static function mapTimeChanges(songTimeChanges:Array<SongTimeChange>)
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{
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timeChanges = [];
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for (currentTimeChange in songTimeChanges)
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{
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// TODO: Maybe handle this different?
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// Do we care about BPM at negative timestamps?
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// Without any custom handling, `currentStepTime` becomes non-zero at `songPosition = 0`.
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if (currentTimeChange.timeStamp < 0.0) currentTimeChange.timeStamp = 0.0;
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if (currentTimeChange.beatTime == null)
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{
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if (currentTimeChange.timeStamp <= 0.0)
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{
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currentTimeChange.beatTime = 0.0;
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}
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else
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{
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// Calculate the beat time of this timestamp.
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currentTimeChange.beatTime = 0.0;
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if (currentTimeChange.timeStamp > 0.0 && timeChanges.length > 0)
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{
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var prevTimeChange:SongTimeChange = timeChanges[timeChanges.length - 1];
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currentTimeChange.beatTime = prevTimeChange.beatTime
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+ ((currentTimeChange.timeStamp - prevTimeChange.timeStamp) * prevTimeChange.bpm / Constants.SECS_PER_MIN / Constants.MS_PER_SEC);
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}
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}
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}
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timeChanges.push(currentTimeChange);
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}
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trace('Done mapping time changes: ' + timeChanges);
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// Done.
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// Update currentStepTime
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Conductor.update(Conductor.songPosition);
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}
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/**
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* Given a time in milliseconds, return a time in steps.
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*/
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public static function getTimeInSteps(ms:Float):Int
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public static function getTimeInSteps(ms:Float):Float
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{
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if (timeChanges.length == 0)
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{
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// Assume a constant BPM equal to the forced value.
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return Math.floor(ms / stepLengthMs);
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return Math.floor(ms / stepCrochet);
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}
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else
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{
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var resultStep:Int = 0;
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var resultStep:Float = 0;
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var lastTimeChange:SongTimeChange = timeChanges[0];
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for (timeChange in timeChanges)
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@ -324,9 +295,19 @@ class Conductor
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}
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}
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resultStep += Math.floor((ms - lastTimeChange.timeStamp) / stepLengthMs);
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resultStep += Math.floor((ms - lastTimeChange.timeStamp) / stepCrochet);
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return resultStep;
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}
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}
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public static function reset():Void
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{
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beatHit.removeAll();
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stepHit.removeAll();
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mapTimeChanges([]);
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forceBPM(null);
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update(0);
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}
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}
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