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PIANO_ROLL_CELL_SIZE,
TOTAL_NOTES,
TRACKER_PATTERN_LENGTH,
} from "consts";
import {
DutyInstrument,
NoiseInstrument,
PatternCell,
WaveInstrument,
} from "shared/lib/uge/types";
import clamp from "shared/lib/helpers/clamp";
type ChannelInstrument = DutyInstrument | WaveInstrument | NoiseInstrument;
const SET_VOLUME_EFFECT = 12;
const NOTE_CUT_EFFECT = 14;
const SET_SPEED_EFFECT = 15;
const TIMER_HZ = 64;
const isInstrumentAudible = (instrument: ChannelInstrument) =>
"volume" in instrument
? instrument.volume > 0
: instrument.initialVolume > 0 || instrument.volumeSweepChange > 0;
const getInstrumentLengthSeconds = (instrument: ChannelInstrument) =>
instrument.length !== null ? instrument.length / 256 : null;
const getInstrumentFadeOutSeconds = (instrument: ChannelInstrument) => {
if (
"volume" in instrument ||
instrument.initialVolume <= 0 ||
instrument.volumeSweepChange >= 0
) {
return null;
}
return (
(instrument.initialVolume * (8 - Math.abs(instrument.volumeSweepChange))) /
64
);
};
export const getPatternTicksPerRow = (
pattern: ReadonlyArray<PatternCell>,
initialTicksPerRow: number,
) => {
let currentTicksPerRow = initialTicksPerRow;
return pattern.map((cell) => {
if (cell.effectCode === SET_SPEED_EFFECT && (cell.effectParam ?? 0) > 0) {
currentTicksPerRow = cell.effectParam ?? currentTicksPerRow;
}
return currentTicksPerRow;
});
};
export const getPatternListStartTicksPerRow = (
patterns: ReadonlyArray<ReadonlyArray<PatternCell> | undefined>,
initialTicksPerRow: number,
) => {
let currentPatternTicksPerRow = initialTicksPerRow;
return patterns.map((pattern) => {
const startTicksPerRow = currentPatternTicksPerRow;
Iif (!pattern) {
return startTicksPerRow;
}
const patternTicksPerRow = getPatternTicksPerRow(
pattern,
currentPatternTicksPerRow,
);
if (patternTicksPerRow.length > 0) {
currentPatternTicksPerRow =
patternTicksPerRow[patternTicksPerRow.length - 1];
}
return startTicksPerRow;
});
};
export const getPatternListTicksPerRow = (
patterns: ReadonlyArray<ReadonlyArray<PatternCell> | undefined>,
initialTicksPerRow: number,
) => {
const ticksPerRowByAbsRow: number[] = [];
let currentPatternTicksPerRow = initialTicksPerRow;
for (const pattern of patterns) {
Iif (!pattern) {
continue;
}
const patternTicksPerRow = getPatternTicksPerRow(
pattern,
currentPatternTicksPerRow,
);
ticksPerRowByAbsRow.push(...patternTicksPerRow);
if (patternTicksPerRow.length > 0) {
currentPatternTicksPerRow =
patternTicksPerRow[patternTicksPerRow.length - 1];
}
}
return ticksPerRowByAbsRow;
};
const getRowsForDurationSeconds = ({
durationSeconds,
startRowIndex,
ticksPerRowByRow,
}: {
durationSeconds: number;
startRowIndex: number;
ticksPerRowByRow: ReadonlyArray<number>;
}) => {
let elapsedSeconds = 0;
for (
let rowIndex = startRowIndex;
rowIndex < ticksPerRowByRow.length;
rowIndex += 1
) {
const rowDurationSeconds = ticksPerRowByRow[rowIndex] / TIMER_HZ;
const nextElapsedSeconds = elapsedSeconds + rowDurationSeconds;
Iif (nextElapsedSeconds >= durationSeconds) {
const secondsIntoRow = durationSeconds - elapsedSeconds;
return rowIndex - startRowIndex + secondsIntoRow / rowDurationSeconds;
}
elapsedSeconds = nextElapsedSeconds;
}
return ticksPerRowByRow.length - startRowIndex;
};
const getRowsUntilNextNote = (
channelCells: ReadonlyArray<PatternCell>,
rowIndex: number,
) => {
for (
let nextRow = rowIndex + 1;
nextRow < channelCells.length;
nextRow += 1
) {
if (channelCells[nextRow].note !== null) {
return nextRow - rowIndex;
}
}
return null;
};
const getRowsUntilSilenceEffect = (
channelCells: ReadonlyArray<PatternCell>,
ticksPerRowByRow: ReadonlyArray<number>,
rowIndex: number,
) => {
for (let nextRow = rowIndex; nextRow < channelCells.length; nextRow += 1) {
const cell = channelCells[nextRow];
Iif (
cell.effectCode === SET_VOLUME_EFFECT &&
(cell.effectParam ?? 0) === 0
) {
return nextRow - rowIndex + 1;
}
if (cell.effectCode === NOTE_CUT_EFFECT) {
const ticksPerRow = ticksPerRowByRow[nextRow];
const cutTick = cell.effectParam ?? 0;
if (cutTick < ticksPerRow) {
return nextRow - rowIndex + cutTick / ticksPerRow;
}
}
}
return null;
};
export const getPatternNoteSustain = ({
instruments,
channelCells,
ticksPerRowByRow,
rowIndex,
instrumentId,
}: {
instruments: ReadonlyArray<ChannelInstrument> | undefined;
channelCells: ReadonlyArray<PatternCell>;
ticksPerRowByRow: ReadonlyArray<number>;
rowIndex: number;
instrumentId: number | null;
}): number => {
Iif (instrumentId === null || !instruments) {
return 0;
}
const instrument = instruments[instrumentId];
Iif (!instrument || !isInstrumentAudible(instrument)) {
return 0;
}
const remainingRows = Math.max(channelCells.length - rowIndex, 1);
let duration = remainingRows;
// Check when note would end because another note played on the same channel
const rowsUntilNextNote = getRowsUntilNextNote(channelCells, rowIndex);
if (rowsUntilNextNote !== null && rowsUntilNextNote < duration) {
duration = rowsUntilNextNote;
}
// Check when note would end because a Note Cut or Volume effect would stop it
const rowsUntilSilenceEffect = getRowsUntilSilenceEffect(
channelCells,
ticksPerRowByRow,
rowIndex,
);
if (rowsUntilSilenceEffect !== null && rowsUntilSilenceEffect < duration) {
duration = rowsUntilSilenceEffect;
}
// Check when note would end because the instrument length was reached
const instrumentLengthSeconds = getInstrumentLengthSeconds(instrument);
Iif (instrumentLengthSeconds !== null) {
const rowsUntilInstrumentLength = getRowsForDurationSeconds({
durationSeconds: instrumentLengthSeconds,
startRowIndex: rowIndex,
ticksPerRowByRow,
});
Iif (rowsUntilInstrumentLength < duration) {
duration = rowsUntilInstrumentLength;
}
}
// Check when note would end because the instrument envelope fade out ended
const fadeOutSeconds = getInstrumentFadeOutSeconds(instrument);
Iif (fadeOutSeconds !== null) {
const rowsUntilFadeOut = getRowsForDurationSeconds({
durationSeconds: fadeOutSeconds,
startRowIndex: rowIndex,
ticksPerRowByRow,
});
Iif (rowsUntilFadeOut < duration) {
duration = rowsUntilFadeOut;
}
}
return Math.max(1, duration);
};
/** Calculates the pixel offset of the playback cursor in the piano-roll timeline. */
export const calculatePlaybackTrackerPosition = (
playbackOrder: number,
playbackRow: number,
currentTick = 0,
ticksPerRow = 0,
) =>
playbackOrder * TRACKER_PATTERN_LENGTH * PIANO_ROLL_CELL_SIZE +
(playbackRow +
(ticksPerRow > 0 ? clamp(currentTick / ticksPerRow, 0, 1) : 0)) *
PIANO_ROLL_CELL_SIZE;
/** Calculates the total pixel width of the piano-roll document for a given sequence length. */
export const calculateDocumentWidth = (sequenceLength: number) =>
sequenceLength * TRACKER_PATTERN_LENGTH * PIANO_ROLL_CELL_SIZE;
/** Converts a MIDI-style note number to a piano-roll row index (top = highest note). */
export const noteToRow = (note: number) => TOTAL_NOTES - 1 - note;
/** Converts a piano-roll row index back to a MIDI-style note number. */
export const rowToNote = (row: number) => TOTAL_NOTES - 1 - row;
interface RollGridPoint {
absRow: number;
note: number;
}
/**
* Bresenham line interpolation between two grid points. Returns all grid
* positions that should be filled when drawing from `from` to `to`.
*/
export const interpolateGridLine = (
from: RollGridPoint | null,
to: RollGridPoint,
): RollGridPoint[] => {
if (!from) {
return [to];
}
const points: RollGridPoint[] = [];
let x0 = from.absRow;
let y0 = from.note;
const x1 = to.absRow;
const y1 = to.note;
const dx = Math.abs(x1 - x0);
const dy = Math.abs(y1 - y0);
const sx = x0 < x1 ? 1 : -1;
const sy = y0 < y1 ? 1 : -1;
let err = dx - dy;
while (x0 !== x1 || y0 !== y1) {
const e2 = 2 * err;
if (e2 > -dy) {
err -= dy;
x0 += sx;
}
if (e2 < dx) {
err += dx;
y0 += sy;
}
points.push({ absRow: x0, note: y0 });
}
return points;
};
/** Converts a pixel offset to a grid cell index using `PIANO_ROLL_CELL_SIZE`. */
export const pixelToGridIndex = (pixel: number) =>
Math.floor(pixel / PIANO_ROLL_CELL_SIZE);
const pixelToGridStart = (pixel: number) =>
pixelToGridIndex(pixel) * PIANO_ROLL_CELL_SIZE;
/**
* Converts a pixel range [start, start+size] to a clamped grid cell range
* [from, to]. Useful for determining which cells overlap a viewport region.
*/
export const pixelRangeToGridRange = (
start: number,
size: number,
max: number,
) => {
const from = clamp(Math.floor(start / PIANO_ROLL_CELL_SIZE), 0, max - 1);
const to = clamp(
Math.ceil((start + size) / PIANO_ROLL_CELL_SIZE),
from + 1,
max,
);
return { from, to };
};
/**
* Converts page coordinates to a snapped grid point within the piano-roll
* canvas. Clamps the result to the valid document bounds.
*/
export const pageToSnappedGridPoint = (
pageX: number,
pageY: number,
bounds: DOMRect,
sequenceLength: number,
) => {
const totalAbsRows = sequenceLength * TRACKER_PATTERN_LENGTH;
return {
x: clamp(
pixelToGridStart(pageX - bounds.left),
0,
totalAbsRows * PIANO_ROLL_CELL_SIZE - 1,
),
y: clamp(
pixelToGridStart(pageY - bounds.top),
0,
TOTAL_NOTES * PIANO_ROLL_CELL_SIZE - PIANO_ROLL_CELL_SIZE,
),
};
};
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