Public
Edited
Dec 10, 2024
Paused
2 stars
function newchunked(a = new Float32Array(), n = 5, balanced = true) {
if (n < 2) return [a.buffer.slice(0)];
const len = a.length;
const bytesPerElement = a.BYTES_PER_ELEMENT;
const totalBytes = a.byteLength;
const out = [];
let i = 0;
let size;
function pushBuffer(start, end) {
const byteStart = start * bytesPerElement
const byteEnd = end * bytesPerElement
const byteLength = byteEnd - byteStart;
let t1 = performance.now()
// formal copy
/*const buffer = new ArrayBuffer(byteLength);
const view = new Uint8Array(buffer);
const sourceView = new Uint8Array(a.buffer, byteStart, byteLength);
view.set(sourceView);
out.push(buffer);*/
// easy copy
out.push(a.buffer.slice(byteStart,byteEnd));
// console.log(~~(performance.now()-t1))
}
if (len % n === 0) {
size = Math.floor(len / n);
while (i < len) {
pushBuffer(i, i + size);
i += size;
}
} else if (balanced) {
while (i < len) {
size = Math.ceil((len - i) / n--);
pushBuffer(i, i + size);
i += size;
}
} else {
n--;
size = Math.floor(len / n);
if (len % size === 0) size--;
while (i < size * n) {
pushBuffer(i, i + size);
i += size;
}
pushBuffer(i, len);
}
return out;
}
// reduce based chunker
function copychunk(arr, n = 1) {
n = Math.ceil(arr.length / n)
if (n <= 0) throw new Error("Chunk size must be a positive integer");
return arr.reduce((acc, _, i) => {
if (i % n === 0) acc.push(arr.slice(i, i + n).buffer);
return acc;
}, []);
}
// calculates buffer offsets given an array
function buffset(a = new Float32Array(), n = 5, balanced = true) {
if (n < 2) return [{byteStart:0,byteEnd:a.buffer.byteLength}];
const len = a.length;
const bytesPerElement = a.BYTES_PER_ELEMENT;
const totalBytes = a.byteLength;
const out = [];
let i = 0;
let size;
function calcBuffer(start, end) {
const byteStart = start * bytesPerElement
const byteEnd = end * bytesPerElement
const byteLength = byteEnd - byteStart;
out.push({byteStart,byteEnd})
}
if (len % n === 0) {
size = Math.floor(len / n);
while (i < len) {
calcBuffer(i, i + size);
i += size;
}
} else if (balanced) {
while (i < len) {
size = Math.ceil((len - i) / n--);
calcBuffer(i, i + size);
i += size;
}
} else {
n--;
size = Math.floor(len / n);
if (len % size === 0) size--;
while (i < size * n) {
calcBuffer(i, i + size);
i += size;
}
calcBuffer(i, len);
}
return out;
}
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