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Refactor conductor (crochet->lengthMs)
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EliteMasterEric
parent
6ac4db48d9
commit
f6c38f9bdd
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@ -1,9 +1,8 @@
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package funkin;
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import flixel.util.FlxSignal;
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import funkin.SongLoad.SwagSong;
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import funkin.play.song.Song.SongDifficulty;
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import funkin.play.song.SongData.SongTimeChange;
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import flixel.util.FlxSignal;
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import funkin.play.song.Song.SongDifficulty;
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typedef BPMChangeEvent =
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{
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@ -12,18 +11,27 @@ typedef BPMChangeEvent =
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var bpm:Float;
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}
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/**
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* A global source of truth for timing information.
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*/
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class Conductor
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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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*/
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static var timeChanges:Array<SongTimeChange> = [];
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static final STEPS_PER_BEAT:Int = 4;
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/**
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* The current time change.
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*/
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static var currentTimeChange:SongTimeChange;
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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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// 120 BPM = 120 quarter notes per minute = 2 onBeatHit per second
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// 120 BPM = 480 sixteenth notes per minute = 8 onStepHit per second
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// 60 BPM = 60 quarter notes per minute = 1 onBeatHit per second
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// 60 BPM = 240 sixteenth notes per minute = 4 onStepHit per second
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// 3/4 = 3 beats per measure = 12 steps per measure
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// (IDENTICAL TO 4/4 but shorter measure length)
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// 120 BPM = 120 quarter notes per minute = 2 onBeatHit per second
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// 120 BPM = 480 sixteenth notes per minute = 8 onStepHit per second
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// 60 BPM = 60 quarter notes per minute = 1 onBeatHit per second
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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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@ -47,8 +55,25 @@ class Conductor
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static var bpmOverride:Null<Float> = null;
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// OLD, replaced with timeChanges.
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public static var bpmChangeMap:Array<BPMChangeEvent> = [];
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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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@ -57,29 +82,33 @@ class Conductor
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static function get_measureLengthMs():Float
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{
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return crochet * timeSignatureNumerator;
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return beatLengthMs * timeSignatureNumerator;
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}
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/**
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* Duration of a beat in millisecond. Calculated based on bpm.
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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 crochet(get, null):Float;
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public static var beatLengthMs(get, null):Float;
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static function get_crochet():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 (quarter) in milliseconds. Calculated based on bpm.
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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 stepCrochet(get, null):Float;
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public static var stepLengthMs(get, null):Float;
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static function get_stepCrochet():Float
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static function get_stepLengthMs():Float
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{
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return crochet / timeSignatureNumerator;
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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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@ -89,6 +118,9 @@ class Conductor
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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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@ -98,30 +130,57 @@ class Conductor
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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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// 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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*/
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static var timeChanges:Array<SongTimeChange> = [];
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/**
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* The current time change.
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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 number of beats (whole notes) in a measure.
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*/
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public static var beatsPerMeasure(get, null):Int;
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static function get_beatsPerMeasure():Int
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@ -129,33 +188,17 @@ 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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// Is this always x4?
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// This is always 4, b
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return timeSignatureNumerator * 4;
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}
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function new() {}
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public static function getLastBPMChange()
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{
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var lastChange:BPMChangeEvent =
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{
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stepTime: 0,
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songTime: 0,
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bpm: 0
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}
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for (i in 0...Conductor.bpmChangeMap.length)
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{
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if (Conductor.songPosition >= Conductor.bpmChangeMap[i].songTime) lastChange = Conductor.bpmChangeMap[i];
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if (Conductor.songPosition < Conductor.bpmChangeMap[i].songTime) break;
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}
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return lastChange;
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}
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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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@ -165,11 +208,16 @@ 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)
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public static function forceBPM(?bpm:Float = null):Void
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{
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if (bpm != null) trace('[CONDUCTOR] Forcing BPM to ' + bpm);
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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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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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@ -180,15 +228,15 @@ 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)
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public static function update(songPosition:Float = null):Void
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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 oldBeat = currentBeat;
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var oldStep = currentStep;
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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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Conductor.songPosition = songPosition;
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// Conductor.bpm = Conductor.getLastBPMChange().bpm;
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currentTimeChange = timeChanges[0];
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for (i in 0...timeChanges.length)
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@ -204,14 +252,14 @@ 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) / stepCrochet;
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currentStepTime = (currentTimeChange.beatTime * 4) + (songPosition - currentTimeChange.timeStamp) / stepLengthMs;
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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 / stepCrochet);
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currentStepTime = (songPosition / stepLengthMs);
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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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@ -226,37 +274,14 @@ class Conductor
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{
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beatHit.dispatch();
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}
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}
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@:deprecated // Switch to TimeChanges instead.
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public static function mapBPMChanges(song:SwagSong)
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{
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bpmChangeMap = [];
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var curBPM:Float = song.bpm;
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var totalSteps:Int = 0;
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var totalPos:Float = 0;
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for (i in 0...SongLoad.getSong().length)
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if (currentMeasure != oldMeasure)
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{
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if (SongLoad.getSong()[i].changeBPM && SongLoad.getSong()[i].bpm != curBPM)
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{
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curBPM = SongLoad.getSong()[i].bpm;
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var event:BPMChangeEvent =
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{
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stepTime: totalSteps,
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songTime: totalPos,
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bpm: curBPM
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};
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bpmChangeMap.push(event);
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}
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var deltaSteps:Int = SongLoad.getSong()[i].lengthInSteps;
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totalSteps += deltaSteps;
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totalPos += ((60 / curBPM) * 1000 / 4) * deltaSteps;
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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>)
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public static function mapTimeChanges(songTimeChanges:Array<SongTimeChange>):Void
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{
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timeChanges = [];
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@ -278,7 +303,7 @@ class Conductor
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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 / stepCrochet);
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return Math.floor(ms / stepLengthMs);
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}
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else
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{
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@ -299,7 +324,7 @@ class Conductor
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}
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}
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resultStep += Math.floor((ms - lastTimeChange.timeStamp) / stepCrochet);
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resultStep += Math.floor((ms - lastTimeChange.timeStamp) / stepLengthMs);
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return resultStep;
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}
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