feat: LOD 网格分级——meshopt 解析期简化 + 按距离/级联选级
vendored meshoptimizer 1.2（submodule 环境故障改直接 vendor）。Mesh 多 LOD：各级索引连续拼进同一 index buffer（共享顶点，LodRange 区间 选择），解析期 meshopt_simplify 生成链（LOD0=原始，每级目标减半， 相对误差 1e-2，小网格复用上级）；都在 worker 线程，加载零额外卡顿。 SceneRenderer 按 (mesh, LOD) 聚合 batch（lookup key = 指针<<8|lod）： 主视图按屏占比近似 radius/dist 选级（阈值 10/20 倍半径）；阴影级联 按级联序降级（越远越简）。Draw 按 batch.lod 选索引区间。 A/B 对比（100 背包 10×10，RTX 5060 Laptop，vsync off）： - 纯背包：LOD 开 93-95 fps / 关 90-107 fps —— 无显著差异 - 加 SunTemple：LOD 开 52-56 / 关 51-55 —— 无显著差异 结论：当前场景瓶颈不在顶点数（5060 顶点吞吐富余），LOD 基础设施 保留（几何复杂资产/低端 GPU/更大场景生效），帧率问题转向 Tracy GPU 时间线定位真实瓶颈。 坑：LodRange 记录"LOD 不足复用最后一级"时 first 不得继续累加 （buffer 无重复数据，累加必越界——VUID-08798 抓的）。
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// This file is part of gltfpack and is distributed under the terms of MIT License.
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/**
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* Initialize the library with the Wasm module (library.wasm)
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*
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* @param wasm Promise with contents of library.wasm
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*
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* Note: this is called automatically in node.js
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*/
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function init(wasm) {
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if (ready) {
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throw new Error('init must be called once');
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}
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ready = Promise.resolve(wasm)
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.then(function (buffer) {
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return WebAssembly.instantiate(buffer, { wasi_snapshot_preview1: wasi });
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})
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.then(function (result) {
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instance = result.instance;
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instance.exports.__wasm_call_ctors();
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});
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}
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/**
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* Pack the requested glTF data using the requested command line and access interface.
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*
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* @param args An array of strings with the input arguments; the paths for input and output files are interpreted by the interface
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* @param iface An interface to the system that will be used to service file requests and other system calls
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* @return Promise that indicates completion of the operation
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*
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* iface should contain the following methods:
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* read(path): Given a path, return a Uint8Array with the contents of that path
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* write(path, data): Write the specified Uint8Array to the provided path
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*/
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function pack(args, iface) {
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if (!ready) {
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throw new Error('init must be called before pack');
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}
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var argv = args.slice();
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argv.unshift('gltfpack');
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return ready.then(function () {
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var buf = uploadArgv(argv);
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output.position = 0;
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output.size = 0;
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fs_interface = iface;
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var result = instance.exports.pack(argv.length, buf);
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fs_interface = undefined;
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instance.exports.free(buf);
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var log = getString(output.data.buffer, 0, output.size);
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if (result != 0) {
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throw new Error(log);
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} else {
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return log;
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}
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});
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}
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// Library implementation (here be dragons)
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var WASI_EBADF = 8;
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var WASI_EINVAL = 28;
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var WASI_EIO = 29;
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var WASI_ENOSYS = 52;
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var ready;
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var instance;
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var fs_interface;
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var output = { data: new Uint8Array(), position: 0, size: 0 };
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var fds = { 1: output, 2: output, 3: { mount: '/', path: '/' }, 4: { mount: '/gltfpack-$pwd', path: '' } };
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var wasi = {
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proc_exit: function (rval) {},
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fd_close: function (fd) {
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if (!fds[fd]) {
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return WASI_EBADF;
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}
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try {
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if (fds[fd].close) {
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fds[fd].close();
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}
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fds[fd] = undefined;
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return 0;
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} catch (err) {
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fds[fd] = undefined;
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return WASI_EIO;
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}
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},
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fd_fdstat_get: function (fd, stat) {
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if (!fds[fd]) {
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return WASI_EBADF;
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}
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var heap = getHeap();
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heap.setUint8(stat + 0, fds[fd].path !== undefined ? 3 : 4);
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heap.setUint16(stat + 2, 0, true);
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heap.setUint32(stat + 8, 0, true);
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heap.setUint32(stat + 12, 0, true);
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heap.setUint32(stat + 16, 0, true);
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heap.setUint32(stat + 20, 0, true);
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return 0;
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},
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path_open32: function (parent_fd, dirflags, path, path_len, oflags, fs_rights_base, fs_rights_inheriting, fdflags, opened_fd) {
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if (!fds[parent_fd] || fds[parent_fd].path === undefined) {
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return WASI_EBADF;
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}
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var heap = getHeap();
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var file = {};
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file.name = fds[parent_fd].path + getString(heap.buffer, path, path_len);
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file.position = 0;
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if (oflags & 1) {
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file.data = new Uint8Array(4096);
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file.size = 0;
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file.close = function () {
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fs_interface.write(file.name, new Uint8Array(file.data.buffer, 0, file.size));
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};
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} else {
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try {
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file.data = fs_interface.read(file.name);
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if (!file.data) {
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return WASI_EIO;
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}
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file.size = file.data.length;
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} catch (err) {
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return WASI_EIO;
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}
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}
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var fd = nextFd();
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fds[fd] = file;
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heap.setUint32(opened_fd, fd, true);
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return 0;
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},
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path_filestat_get: function (parent_fd, flags, path, path_len, buf) {
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if (!fds[parent_fd] || fds[parent_fd].path === undefined) {
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return WASI_EBADF;
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}
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var heap = getHeap();
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var name = getString(heap.buffer, path, path_len);
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for (var i = 0; i < 64; ++i) heap.setUint8(buf + i, 0);
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heap.setUint8(buf + 16, name == '.' ? 3 : 4);
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return 0;
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},
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fd_prestat_get: function (fd, buf) {
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if (!fds[fd] || fds[fd].path === undefined) {
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return WASI_EBADF;
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}
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var path_buf = stringBuffer(fds[fd].mount);
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var heap = getHeap();
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heap.setUint8(buf, 0);
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heap.setUint32(buf + 4, path_buf.length, true);
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return 0;
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},
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fd_prestat_dir_name: function (fd, path, path_len) {
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if (!fds[fd] || fds[fd].path === undefined) {
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return WASI_EBADF;
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}
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var path_buf = stringBuffer(fds[fd].mount);
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if (path_len != path_buf.length) {
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return WASI_EINVAL;
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}
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var heap = getHeap();
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new Uint8Array(heap.buffer).set(path_buf, path);
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return 0;
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},
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path_remove_directory: function (parent_fd, path, path_len) {
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return WASI_EINVAL;
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},
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fd_fdstat_set_flags: function (fd, flags) {
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return WASI_ENOSYS;
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},
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fd_seek32: function (fd, offset, whence, newoffset) {
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if (!fds[fd]) {
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return WASI_EBADF;
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}
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var newposition;
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switch (whence) {
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case 0:
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newposition = offset;
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break;
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case 1:
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newposition = fds[fd].position + offset;
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break;
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case 2:
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newposition = fds[fd].size + offset;
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break;
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default:
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return WASI_EINVAL;
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}
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if (newposition < 0 || newposition > fds[fd].size) {
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return WASI_EINVAL;
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}
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fds[fd].position = newposition;
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var heap = getHeap();
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heap.setUint32(newoffset, newposition, true);
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return 0;
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},
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fd_read: function (fd, iovs, iovs_len, nread) {
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if (!fds[fd]) {
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return WASI_EBADF;
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}
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var heap = getHeap();
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var read = 0;
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for (var i = 0; i < iovs_len; ++i) {
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var buf = heap.getUint32(iovs + 8 * i + 0, true);
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var buf_len = heap.getUint32(iovs + 8 * i + 4, true);
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var readi = Math.min(fds[fd].size - fds[fd].position, buf_len);
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new Uint8Array(heap.buffer).set(fds[fd].data.subarray(fds[fd].position, fds[fd].position + readi), buf);
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fds[fd].position += readi;
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read += readi;
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}
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heap.setUint32(nread, read, true);
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return 0;
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},
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fd_write: function (fd, iovs, iovs_len, nwritten) {
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if (!fds[fd]) {
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return WASI_EBADF;
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}
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var heap = getHeap();
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var written = 0;
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for (var i = 0; i < iovs_len; ++i) {
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var buf = heap.getUint32(iovs + 8 * i + 0, true);
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var buf_len = heap.getUint32(iovs + 8 * i + 4, true);
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if (fds[fd].position + buf_len > fds[fd].data.length) {
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fds[fd].data = growArray(fds[fd].data, fds[fd].position + buf_len);
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}
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fds[fd].data.set(new Uint8Array(heap.buffer, buf, buf_len), fds[fd].position);
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fds[fd].position += buf_len;
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fds[fd].size = Math.max(fds[fd].position, fds[fd].size);
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written += buf_len;
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}
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heap.setUint32(nwritten, written, true);
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return 0;
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},
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};
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function nextFd() {
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for (var i = 1; ; ++i) {
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if (fds[i] === undefined) {
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return i;
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}
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}
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}
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function getHeap() {
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return new DataView(instance.exports.memory.buffer);
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}
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function getString(buffer, offset, length) {
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return new TextDecoder().decode(new Uint8Array(buffer, offset, length));
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}
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function stringBuffer(string) {
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return new TextEncoder().encode(string);
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}
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function growArray(data, len) {
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var new_length = Math.max(1, data.length);
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while (new_length < len) {
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new_length *= 2;
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}
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var new_data = new Uint8Array(new_length);
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new_data.set(data);
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return new_data;
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}
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function uploadArgv(argv) {
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var buf_size = argv.length * 4;
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for (var i = 0; i < argv.length; ++i) {
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buf_size += stringBuffer(argv[i]).length + 1;
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}
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var buf = instance.exports.malloc(buf_size);
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var argp = buf + argv.length * 4;
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var heap = getHeap();
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for (var i = 0; i < argv.length; ++i) {
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var item = stringBuffer(argv[i]);
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heap.setUint32(buf + i * 4, argp, true);
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new Uint8Array(heap.buffer).set(item, argp);
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heap.setUint8(argp + item.length, 0);
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argp += item.length + 1;
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}
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return buf;
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}
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// Automatic initialization for node.js
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if (typeof process !== 'undefined' && process.release && process.release.name === 'node') {
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init(
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import('node:fs').then(function (fs) {
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return fs.readFileSync(new URL('./library.wasm', import.meta.url));
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})
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);
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}
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export { init, pack };
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