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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | 98x 98x 98x 9418x 98x 112x 98x 4x 4x 98x 9189x 98x 94x 98x 55x 98x 318x 318x 318x 98x 316x 316x 316x 98x 316x 316x 316x | import {
TRACKER_NUM_CHANNELS,
TRACKER_PATTERN_LENGTH,
TRACKER_SUBPATTERN_LENGTH,
} from "consts";
import {
Song,
Pattern,
SequenceItem,
PatternCell,
SubPatternCell,
DutyInstrument,
WaveInstrument,
NoiseInstrument,
} from "./types";
const LAST_VERSION = 6;
/** Creates a new empty PatternCell with all fields set to null. */
export const createPatternCell = (): PatternCell => {
return {
note: null,
instrument: null,
effectCode: null,
effectParam: null,
};
};
/** Creates a new empty Pattern with `TRACKER_PATTERN_LENGTH` rows. */
export const createPattern = (): Pattern => {
return Array.from(
{ length: TRACKER_PATTERN_LENGTH },
createPatternCell,
) as Pattern;
};
/** Maps a linked UI pattern index to four per-channel pattern indices. */
export const createSequenceItem = (patternId: number): SequenceItem => {
const basePatternId = patternId * TRACKER_NUM_CHANNELS;
return {
splitPattern: false,
channels: [
basePatternId,
basePatternId + 1,
basePatternId + 2,
basePatternId + 3,
],
};
};
/** Creates a new empty SubPatternCell with all fields set to null. */
export const createSubPatternCell = (): SubPatternCell => {
return {
note: null,
jump: null,
effectCode: null,
effectParam: null,
};
};
/** Creates a new empty subpattern with `TRACKER_SUBPATTERN_LENGTH` empty cells. */
export const createSubPattern = (): SubPatternCell[] => {
return Array.from({ length: TRACKER_SUBPATTERN_LENGTH }).map(
createSubPatternCell,
);
};
/** Creates a new blank Song with default values and empty instrument/pattern lists. */
export const createSong = (): Song => {
return {
version: LAST_VERSION,
name: "",
artist: "",
comment: "",
filename: "song",
dutyInstruments: [],
waveInstruments: [],
noiseInstruments: [],
waves: [],
ticksPerRow: 6,
timerEnabled: false,
timerDivider: 0,
patterns: [],
sequence: [],
};
};
/** Appends a DutyInstrument to the song, setting its index to the current list length. */
export const addDutyInstrument = (song: Song, instrument: DutyInstrument) => {
const list = song.dutyInstruments;
instrument.index = list.length;
list.push(instrument);
};
/** Appends a WaveInstrument to the song, setting its index to the current list length. */
export const addWaveInstrument = (song: Song, instrument: WaveInstrument) => {
const list = song.waveInstruments;
instrument.index = list.length;
list.push(instrument);
};
/** Appends a NoiseInstrument to the song, setting its index to the current list length. */
export const addNoiseInstrument = (song: Song, instrument: NoiseInstrument) => {
const list = song.noiseInstruments;
instrument.index = list.length;
list.push(instrument);
};
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