mirror of
https://github.com/cocos/cocos-engine.git
synced 2026-09-09 00:58:50 +08:00
105 lines
4.4 KiB
TypeScript
105 lines
4.4 KiB
TypeScript
/*
|
|
Copyright (c) 2020 Xiamen Yaji Software Co., Ltd.
|
|
|
|
https://www.cocos.com/
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated engine source code (the "Software"), a limited,
|
|
worldwide, royalty-free, non-assignable, revocable and non-exclusive license
|
|
to use Cocos Creator solely to develop games on your target platforms. You shall
|
|
not use Cocos Creator software for developing other software or tools that's
|
|
used for developing games. You are not granted to publish, distribute,
|
|
sublicense, and/or sell copies of Cocos Creator.
|
|
|
|
The software or tools in this License Agreement are licensed, not sold.
|
|
Xiamen Yaji Software Co., Ltd. reserves all rights not expressly granted to you.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
THE SOFTWARE.
|
|
*/
|
|
|
|
import { Format, FormatInfos, FormatType, FormatInfo } from '../../core/gfx';
|
|
import { sys } from '../../core/platform/sys';
|
|
|
|
const _typeMap: Record<string, string> = {
|
|
[FormatType.UNORM]: 'Uint',
|
|
[FormatType.SNORM]: 'Int',
|
|
[FormatType.UINT]: 'Uint',
|
|
[FormatType.INT]: 'Int',
|
|
[FormatType.UFLOAT]: 'Float',
|
|
[FormatType.FLOAT]: 'Float',
|
|
default: 'Uint',
|
|
};
|
|
function _getDataViewType (info: FormatInfo) {
|
|
const type = _typeMap[info.type] || _typeMap.default;
|
|
const bytes = info.size / info.count * 8;
|
|
return `${type}${bytes}`;
|
|
}
|
|
|
|
// default params bahaves just like on an plain, compact Float32Array
|
|
export function writeBuffer (target: DataView, data: number[], format: Format = Format.R32F, offset = 0, stride = 0) {
|
|
const info = FormatInfos[format];
|
|
if (!stride) { stride = info.size; }
|
|
const writer = `set${_getDataViewType(info)}`;
|
|
const componentBytesLength = info.size / info.count;
|
|
const nSeg = Math.floor(data.length / info.count);
|
|
const isLittleEndian = sys.isLittleEndian;
|
|
|
|
for (let iSeg = 0; iSeg < nSeg; ++iSeg) {
|
|
const x = offset + stride * iSeg;
|
|
for (let iComponent = 0; iComponent < info.count; ++iComponent) {
|
|
const y = x + componentBytesLength * iComponent;
|
|
target[writer](y, data[info.count * iSeg + iComponent], isLittleEndian);
|
|
}
|
|
}
|
|
}
|
|
export function readBuffer (
|
|
target: DataView, format: Format = Format.R32F, offset = 0,
|
|
length: number = target.byteLength - offset, stride = 0, out: number[] = [],
|
|
) {
|
|
const info = FormatInfos[format];
|
|
if (!stride) { stride = info.size; }
|
|
const reader = `get${_getDataViewType(info)}`;
|
|
const componentBytesLength = info.size / info.count;
|
|
const nSeg = Math.floor(length / stride);
|
|
const isLittleEndian = sys.isLittleEndian;
|
|
|
|
for (let iSeg = 0; iSeg < nSeg; ++iSeg) {
|
|
const x = offset + stride * iSeg;
|
|
for (let iComponent = 0; iComponent < info.count; ++iComponent) {
|
|
const y = x + componentBytesLength * iComponent;
|
|
out[info.count * iSeg + iComponent] = target[reader](y, isLittleEndian);
|
|
}
|
|
}
|
|
return out;
|
|
}
|
|
export function mapBuffer (
|
|
target: DataView, callback: (cur: number, idx: number, view: DataView) => number, format: Format = Format.R32F,
|
|
offset = 0, length: number = target.byteLength - offset, stride = 0, out?: DataView,
|
|
) {
|
|
if (!out) { out = new DataView(target.buffer.slice(target.byteOffset, target.byteOffset + target.byteLength)); }
|
|
const info = FormatInfos[format];
|
|
if (!stride) { stride = info.size; }
|
|
const writer = `set${_getDataViewType(info)}`;
|
|
const reader = `get${_getDataViewType(info)}`;
|
|
const componentBytesLength = info.size / info.count;
|
|
const nSeg = Math.floor(length / stride);
|
|
const isLittleEndian = sys.isLittleEndian;
|
|
|
|
for (let iSeg = 0; iSeg < nSeg; ++iSeg) {
|
|
const x = offset + stride * iSeg;
|
|
for (let iComponent = 0; iComponent < info.count; ++iComponent) {
|
|
const y = x + componentBytesLength * iComponent;
|
|
const cur = target[reader](y, isLittleEndian);
|
|
// iComponent is usually more useful than y
|
|
out[writer](y, callback(cur, iComponent, target), isLittleEndian);
|
|
}
|
|
}
|
|
return out;
|
|
}
|