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webgpuBufferManager.ts
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webgpuBufferManager.ts
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import type { DataBuffer } from "../../Buffers/dataBuffer";
import { WebGPUDataBuffer } from "../../Meshes/WebGPU/webgpuDataBuffer";
import { FromHalfFloat } from "../../Misc/textureTools";
import type { Nullable } from "../../types";
import { Constants } from "../constants";
import { allocateAndCopyTypedBuffer } from "../Extensions/engine.readTexture";
import * as WebGPUConstants from "./webgpuConstants";
/** @internal */
export class WebGPUBufferManager {
private _device: GPUDevice;
private _deferredReleaseBuffers: Array<GPUBuffer> = [];
private static _IsGPUBuffer(buffer: DataBuffer | GPUBuffer): buffer is GPUBuffer {
return (buffer as DataBuffer).underlyingResource === undefined;
}
constructor(device: GPUDevice) {
this._device = device;
}
public createRawBuffer(viewOrSize: ArrayBufferView | number, flags: GPUBufferUsageFlags, mappedAtCreation = false): GPUBuffer {
const alignedLength = (viewOrSize as ArrayBufferView).byteLength !== undefined ? ((viewOrSize as ArrayBufferView).byteLength + 3) & ~3 : ((viewOrSize as number) + 3) & ~3; // 4 bytes alignments (because of the upload which requires this)
const verticesBufferDescriptor = {
mappedAtCreation,
size: alignedLength,
usage: flags,
};
return this._device.createBuffer(verticesBufferDescriptor);
}
public createBuffer(viewOrSize: ArrayBufferView | number, flags: GPUBufferUsageFlags): WebGPUDataBuffer {
const isView = (viewOrSize as ArrayBufferView).byteLength !== undefined;
const buffer = this.createRawBuffer(viewOrSize, flags);
const dataBuffer = new WebGPUDataBuffer(buffer);
dataBuffer.references = 1;
dataBuffer.capacity = isView ? (viewOrSize as ArrayBufferView).byteLength : (viewOrSize as number);
if (isView) {
this.setSubData(dataBuffer, 0, viewOrSize as ArrayBufferView);
}
return dataBuffer;
}
public setRawData(buffer: GPUBuffer, dstByteOffset: number, src: ArrayBufferView, srcByteOffset: number, byteLength: number): void {
this._device.queue.writeBuffer(buffer, dstByteOffset, src.buffer, srcByteOffset, byteLength);
}
public setSubData(dataBuffer: WebGPUDataBuffer, dstByteOffset: number, src: ArrayBufferView, srcByteOffset = 0, byteLength = 0): void {
const buffer = dataBuffer.underlyingResource as GPUBuffer;
byteLength = byteLength || src.byteLength;
byteLength = Math.min(byteLength, dataBuffer.capacity - dstByteOffset);
// After Migration to Canary
let chunkStart = src.byteOffset + srcByteOffset;
let chunkEnd = chunkStart + byteLength;
// 4 bytes alignments for upload
const alignedLength = (byteLength + 3) & ~3;
if (alignedLength !== byteLength) {
const tempView = new Uint8Array(src.buffer.slice(chunkStart, chunkEnd));
src = new Uint8Array(alignedLength);
(src as Uint8Array).set(tempView);
srcByteOffset = 0;
chunkStart = 0;
chunkEnd = alignedLength;
byteLength = alignedLength;
}
// Chunk
const maxChunk = 1024 * 1024 * 15;
let offset = 0;
while (chunkEnd - (chunkStart + offset) > maxChunk) {
this._device.queue.writeBuffer(buffer, dstByteOffset + offset, src.buffer, chunkStart + offset, maxChunk);
offset += maxChunk;
}
this._device.queue.writeBuffer(buffer, dstByteOffset + offset, src.buffer, chunkStart + offset, byteLength - offset);
}
private _getHalfFloatAsFloatRGBAArrayBuffer(dataLength: number, arrayBuffer: ArrayBuffer, destArray?: Float32Array): Float32Array {
if (!destArray) {
destArray = new Float32Array(dataLength);
}
const srcData = new Uint16Array(arrayBuffer);
while (dataLength--) {
destArray[dataLength] = FromHalfFloat(srcData[dataLength]);
}
return destArray;
}
public readDataFromBuffer(
gpuBuffer: GPUBuffer,
size: number,
width: number,
height: number,
bytesPerRow: number,
bytesPerRowAligned: number,
type = Constants.TEXTURETYPE_UNSIGNED_BYTE,
offset = 0,
buffer: Nullable<ArrayBufferView> = null,
destroyBuffer = true,
noDataConversion = false
): Promise<ArrayBufferView> {
const floatFormat = type === Constants.TEXTURETYPE_FLOAT ? 2 : type === Constants.TEXTURETYPE_HALF_FLOAT ? 1 : 0;
return new Promise((resolve, reject) => {
gpuBuffer.mapAsync(WebGPUConstants.MapMode.Read, offset, size).then(
() => {
const copyArrayBuffer = gpuBuffer.getMappedRange(offset, size);
let data: Nullable<ArrayBufferView> | Uint8Array | Float32Array = buffer;
if (noDataConversion) {
if (data === null) {
data = allocateAndCopyTypedBuffer(type, size, true, copyArrayBuffer);
} else {
data = allocateAndCopyTypedBuffer(type, data.buffer, undefined, copyArrayBuffer);
}
} else {
if (data === null) {
switch (floatFormat) {
case 0: // byte format
data = new Uint8Array(size);
(data as Uint8Array).set(new Uint8Array(copyArrayBuffer));
break;
case 1: // half float
// TODO WEBGPU use computer shaders (or render pass) to make the conversion?
data = this._getHalfFloatAsFloatRGBAArrayBuffer(size / 2, copyArrayBuffer);
break;
case 2: // float
data = new Float32Array(size / 4);
(data as Float32Array).set(new Float32Array(copyArrayBuffer));
break;
}
} else {
switch (floatFormat) {
case 0: // byte format
data = new Uint8Array(data.buffer);
(data as Uint8Array).set(new Uint8Array(copyArrayBuffer));
break;
case 1: // half float
// TODO WEBGPU use computer shaders (or render pass) to make the conversion?
data = this._getHalfFloatAsFloatRGBAArrayBuffer(size / 2, copyArrayBuffer, buffer as Float32Array);
break;
case 2: // float
data = new Float32Array(data.buffer);
(data as Float32Array).set(new Float32Array(copyArrayBuffer));
break;
}
}
}
if (bytesPerRow !== bytesPerRowAligned) {
// TODO WEBGPU use computer shaders (or render pass) to build the final buffer data?
if (floatFormat === 1 && !noDataConversion) {
// half float have been converted to float above
bytesPerRow *= 2;
bytesPerRowAligned *= 2;
}
const data2 = new Uint8Array(data!.buffer);
let offset = bytesPerRow,
offset2 = 0;
for (let y = 1; y < height; ++y) {
offset2 = y * bytesPerRowAligned;
for (let x = 0; x < bytesPerRow; ++x) {
data2[offset++] = data2[offset2++];
}
}
if (floatFormat !== 0 && !noDataConversion) {
data = new Float32Array(data2.buffer, 0, offset / 4);
} else {
data = new Uint8Array(data2.buffer, 0, offset);
}
}
gpuBuffer.unmap();
if (destroyBuffer) {
this.releaseBuffer(gpuBuffer);
}
resolve(data!);
},
(reason) => reject(reason)
);
});
}
public releaseBuffer(buffer: DataBuffer | GPUBuffer): boolean {
if (WebGPUBufferManager._IsGPUBuffer(buffer)) {
this._deferredReleaseBuffers.push(buffer);
return true;
}
buffer.references--;
if (buffer.references === 0) {
this._deferredReleaseBuffers.push(buffer.underlyingResource as GPUBuffer);
return true;
}
return false;
}
public destroyDeferredBuffers(): void {
for (let i = 0; i < this._deferredReleaseBuffers.length; ++i) {
this._deferredReleaseBuffers[i].destroy();
}
this._deferredReleaseBuffers.length = 0;
}
}