commit 18eaaff65fe2fec38ca28a197b0b4a8af47eab97 Author: 4hyhzi <2082529121@qq.com> Date: Mon May 18 16:51:56 2026 +0800 chore: 初始化glTF模型压缩工具包 添加了完整的项目配置、工具函数、纹理压缩与模型优化实现，以及文档说明 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..c359bee --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +dist +demo +node_modules \ No newline at end of file diff --git a/.npmrc b/.npmrc new file mode 100644 index 0000000..c3f7e9c --- /dev/null +++ b/.npmrc @@ -0,0 +1,3 @@ +registry=https://npm.blendercg.art/ +always-auth=true +//npm.blendercg.art/:_authToken=MjVhMDVlN2ZiODUxMjFkNjhmYzVhZWFmOTZhNTA3Mzc6ZjkyNTYxN2RhM2QwOTc5NTFiMTU3MGEyM2U3Zjc0NzQ4YmUzYTJiOTc1Yzg0OWUwMzEzNjgyZDAwMjdlNDA2ZmZkYjJmODFhYWQ2MjVjYmFlZGJj \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..d2c0cfb --- /dev/null +++ b/README.md @@ -0,0 +1,40 @@ +# @g1sir8b/gltf-model-compressor + +用于： + +- 优化 `.gltf` / `.glb` +- 自动补全法线和切线 +- 可选纹理压缩 +- 输出为 `gltf + buffer.bin` 或 `glb` + +## 构建 + +```bash +npm run build +``` + +## 使用 + +```ts +import optimizeModel from '@g1sir8b/gltf-model-compressor'; + +await optimizeModel( + 'D:/input/model.glb', + 'D:/output', + 'medium', + true +); +``` + +也支持对象参数： + +```ts +import { optimizeModelWithOptions } from '@g1sir8b/gltf-model-compressor'; + +await optimizeModelWithOptions({ + input: 'D:/input/model.gltf', + output: 'D:/output', + compressTex: 'off', + toGLB: false +}); +``` diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..3ad12f7 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1458 @@ +{ + "name": "@g1sir8b/gltf-model-compressor", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "@g1sir8b/gltf-model-compressor", + "version": "1.0.0", + "dependencies": { + "gl-matrix": "^3.4.3", + "gltf-pipeline": "^4.1.0", + "image-size": "^2.0.2", + "jimp": "^1.6.1", + "mime": "^3.0.0", + "seinjs-texture-compressor": "^1.0.3" + }, + 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transitivePeerDependencies: + - react-native-b4a + + tinycolor2@1.6.0: {} + + token-types@6.1.2: + dependencies: + '@borewit/text-codec': 0.2.2 + '@tokenizer/token': 0.3.0 + ieee754: 1.2.1 + + topojson-client@3.1.0: + dependencies: + commander: 2.20.3 + + tslib@2.8.1: {} + + tunnel-agent@0.6.0: + dependencies: + safe-buffer: 5.2.1 + + typescript@5.9.3: {} + + uint8array-extras@1.5.0: {} + + undici-types@6.21.0: {} + + universalify@2.0.1: {} + + urijs@1.19.11: {} + + utif2@4.1.0: + dependencies: + pako: 1.0.11 + + util-deprecate@1.0.2: {} + + wrap-ansi@7.0.0: + dependencies: + ansi-styles: 4.3.0 + string-width: 4.2.3 + strip-ansi: 6.0.1 + + wrappy@1.0.2: {} + + xml-parse-from-string@1.0.1: {} + + xml2js@0.5.0: + dependencies: + sax: 1.6.0 + xmlbuilder: 11.0.1 + + xmlbuilder@11.0.1: {} + + y18n@5.0.8: {} + + yargs-parser@21.1.1: {} + + yargs@17.7.2: + dependencies: + cliui: 8.0.1 + escalade: 3.2.0 + get-caller-file: 2.0.5 + require-directory: 2.1.1 + string-width: 4.2.3 + y18n: 5.0.8 + yargs-parser: 21.1.1 + + zod@3.25.76: {} diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml new file mode 100644 index 0000000..c7e719e --- /dev/null +++ b/pnpm-workspace.yaml @@ -0,0 +1,6 @@ +onlyBuiltDependencies: + - '@webassembly/sharp' + - protobufjs +supportedArchitectures: + os: [win32] + cpu: [x64] diff --git a/src/compressTexture.ts b/src/compressTexture.ts new file mode 100644 index 0000000..aa550a5 --- /dev/null +++ b/src/compressTexture.ts @@ -0,0 +1,286 @@ +import * as fs from 'fs'; +import * as os from 'os'; +import * as path from 'path'; +import { spawn } from 'child_process'; +import { readImageMetadata } from './imageTools'; +import { showInfo } from './utils'; + +// eslint-disable-next-line @typescript-eslint/no-var-requires +const { getBinaryDirectory } = require('seinjs-texture-compressor/dist/cli/lib/utilities'); + +export type TextureCompressionQuality = 'high' | 'medium' | 'low'; + +function resolveTmpDir(): string { + const explicit = (process.env.XR_TEX_TMP_DIR || '').trim(); + if (explicit) { + return path.resolve(explicit); + } + + const preferRam = process.env.XR_TMP_PREFER_RAM !== '0'; + if (preferRam && process.platform !== 'win32') { + const shmBase = '/dev/shm'; + try { + if (fs.existsSync(shmBase) && fs.statSync(shmBase).isDirectory()) { + return path.join(shmBase, 'xr-frame-toolkit-tmp'); + } + } catch { + // Ignore tmp dir probing errors. + } + } + + return path.resolve(os.tmpdir(), 'xr-frame-toolkit-tmp'); +} + +const TMP_DIR = resolveTmpDir(); +if (!fs.existsSync(TMP_DIR)) { + fs.mkdirSync(TMP_DIR, { recursive: true }); +} + +showInfo(`[tex-tmp] using tmp dir: ${TMP_DIR}`); + +const HEARTBEAT_MS = Math.max(5_000, Number(process.env.XR_TEX_HEARTBEAT_MS || 30_000)); +const BASE_STEP_TIMEOUT_MS = Math.max(30_000, Number(process.env.XR_TEX_STEP_TIMEOUT_MS || 20 * 60 * 1000)); +const ETCSLOW_STEP_TIMEOUT_MS = Math.max(60_000, Number(process.env.XR_TEX_ETCSLOW_TIMEOUT_MS || 120 * 60 * 1000)); + +function mipLevels(width: number): number { + return Math.floor(Math.log2(Math.max(1, width))) + 1; +} + +async function runToolWithWatch( + src: string, + destFormat: 'astc' | 'etc' | 'pvrtc' | 's3tc', + destEncoding: string, + destQuality: string, + inputPath: string, + outputPath: string, + widthForMips: number +) { + const binDir = await getBinaryDirectory(); + const isS3TC = destFormat === 's3tc'; + const toolName = isS3TC ? 'crunch' : 'PVRTexToolCLI'; + const toolPath = path.join(binDir, toolName); + + const flags = isS3TC + ? [ + '-file', + inputPath, + '-out', + outputPath, + '-fileformat', + 'ktx', + `-${destEncoding}`, + '-dxtQuality', + `${destQuality}`, + '-helperThreads', + os.cpus().length.toString(), + '-mipMode', + 'Generate', + '-maxmips', + `${mipLevels(widthForMips)}` + ] + : [ + '-i', + inputPath, + '-o', + outputPath, + '-f', + `${destEncoding}`, + '-q', + `${destQuality}`, + '-pot', + '+', + '-m', + `${mipLevels(widthForMips)}` + ]; + + if (!isS3TC && destFormat === 'pvrtc') { + flags.push('-square', '+'); + } + + showInfo(`Using flags: ${flags.join(',')}`); + + const startedAt = Date.now(); + const timeoutMs = destFormat === 'etc' && destQuality === 'etcslow' + ? ETCSLOW_STEP_TIMEOUT_MS + : BASE_STEP_TIMEOUT_MS; + + await new Promise((resolve, reject) => { + const child = spawn(toolPath, flags, { + env: { + ...process.env, + PATH: `${binDir}${path.delimiter}${process.env.PATH || ''}` + }, + windowsHide: true + }); + + let timedOut = false; + const heartbeatTimer = setInterval(() => { + const elapsed = Math.round((Date.now() - startedAt) / 1000); + showInfo(`[tex-watch] running ${src} -> ${destFormat} (${destEncoding}/${destQuality}), ${elapsed}s elapsed`); + }, HEARTBEAT_MS); + + const timeoutTimer = setTimeout(() => { + timedOut = true; + const elapsed = Math.round((Date.now() - startedAt) / 1000); + showInfo(`[tex-watch] timeout ${src} -> ${destFormat} after ${elapsed}s, killing pid=${child.pid || -1}`); + + try { + child.kill('SIGKILL'); + } catch { + // Ignore kill errors. + } + + if (process.platform === 'win32' && child.pid) { + try { + const killer = spawn('taskkill', ['/pid', String(child.pid), '/t', '/f'], { + stdio: 'ignore', + windowsHide: true + }); + killer.unref(); + } catch { + // Ignore taskkill errors. + } + } + }, timeoutMs); + + child.stdout?.on('data', (data) => { + const text = String(data || '').trim(); + if (text) { + showInfo(`[tex-cli][${destFormat}] ${text}`); + } + }); + + child.stderr?.on('data', (data) => { + const text = String(data || '').trim(); + if (text) { + showInfo(`[tex-cli][${destFormat}] ${text}`); + } + }); + + child.once('error', (error) => { + clearInterval(heartbeatTimer); + clearTimeout(timeoutTimer); + reject(error); + }); + + child.once('exit', (code) => { + clearInterval(heartbeatTimer); + clearTimeout(timeoutTimer); + + if (timedOut) { + reject( + new Error( + `Compression timeout: ${src} -> ${destFormat}, quality=${destQuality}, limit=${Math.round(timeoutMs / 1000)}s` + ) + ); + return; + } + + if (code !== 0) { + reject(new Error(`Compression tool exited with error code ${code}`)); + return; + } + + resolve(); + }); + }); +} + +export default async function compressTexture( + src: string, + buffer: Buffer, + quality: TextureCompressionQuality, + isNormalMap: boolean +): Promise<{ astc: Buffer; pvrtc: Buffer; s3tc: Buffer; etc: Buffer }> { + const isTransparent = /(png|exr)$/i.test(src); + const metadata = readImageMetadata(buffer); + const widthForMips = metadata?.width || 1; + + if (!metadata?.width) { + showInfo(`[tex-debug][mips] ${src}: width unknown, fallback width=1`); + } + + let destEncoding = ''; + let destQuality = ''; + const runId = `${process.pid}_${Date.now()}_${Math.random().toString(36).slice(2, 10)}`; + const tmpSrcPath = path.resolve(TMP_DIR, `compress_tex_${runId}_src${path.extname(src)}`); + fs.writeFileSync(tmpSrcPath, buffer); + + const tmpDestPaths: string[] = []; + const result = {} as { astc: Buffer; pvrtc: Buffer; s3tc: Buffer; etc: Buffer }; + + try { + for (const destFormat of ['astc', 'etc', 'pvrtc', 's3tc'] as const) { + if (destFormat === 'astc') { + if (quality === 'high') { + destEncoding = (isTransparent || isNormalMap) ? 'ASTC_4x4' : 'ASTC_5x5'; + destQuality = 'astcthorough'; + } else if (quality === 'medium') { + destEncoding = (isTransparent || isNormalMap) ? 'ASTC_5x5' : 'ASTC_6x6'; + destQuality = 'astcmedium'; + } else { + destEncoding = (isTransparent || isNormalMap) ? 'ASTC_6x6' : 'ASTC_8x6'; + destQuality = 'astcfast'; + } + } else if (destFormat === 'pvrtc') { + if (quality === 'low') { + destEncoding = (isTransparent && !isNormalMap) ? 'PVRTC1_2' : 'PVRTC1_2_RGB'; + destQuality = 'pvrtcbest'; + } else { + destEncoding = (isTransparent && !isNormalMap) ? 'PVRTC1_4' : 'PVRTC1_4_RGB'; + destQuality = 'pvrtcnormal'; + } + } else if (destFormat === 'etc') { + destEncoding = (isTransparent && !isNormalMap) ? 'ETC2_RGBA' : 'ETC2_RGB'; + destQuality = 'etcfast'; + } else if (destFormat === 's3tc') { + if (quality === 'low') { + destEncoding = (isTransparent && !isNormalMap) ? 'DXT3' : 'DXT1'; + destQuality = 'better'; + } else { + destEncoding = (isTransparent && !isNormalMap) ? 'DXT5' : 'DXT3'; + destQuality = 'fast'; + } + } + + showInfo(`packing: ${src} to ${destFormat}`); + const tmpDestPath = path.resolve(TMP_DIR, `compress_tex_${runId}_${destFormat}.ktx`); + tmpDestPaths.push(tmpDestPath); + + try { + await runToolWithWatch( + src, + destFormat, + destEncoding, + destQuality, + tmpSrcPath, + tmpDestPath, + widthForMips + ); + result[destFormat] = fs.readFileSync(tmpDestPath); + } catch (error: any) { + throw new Error(`Compress error: '${error.message}'`); + } + } + } finally { + try { + if (fs.existsSync(tmpSrcPath)) { + fs.unlinkSync(tmpSrcPath); + } + } catch { + // Ignore cleanup errors. + } + + for (const tmpDestPath of tmpDestPaths) { + try { + if (fs.existsSync(tmpDestPath)) { + fs.unlinkSync(tmpDestPath); + } + } catch { + // Ignore cleanup errors. + } + } + } + + return result; +} diff --git a/src/imageTools.ts b/src/imageTools.ts new file mode 100644 index 0000000..f1c470c --- /dev/null +++ b/src/imageTools.ts @@ -0,0 +1,46 @@ +import * as path from 'path'; +import { imageSize } from 'image-size'; +import { Jimp, JimpMime } from 'jimp'; + +export interface ImageMetadata { + width?: number; + height?: number; + type?: string; +} + +const MIME_BY_EXT: Record = { + '.bmp': JimpMime.bmp, + '.gif': JimpMime.gif, + '.jpeg': JimpMime.jpeg, + '.jpg': JimpMime.jpeg, + '.png': JimpMime.png, + '.tif': JimpMime.tiff, + '.tiff': JimpMime.tiff +}; + +export function readImageMetadata(buffer: Buffer): ImageMetadata { + const result = imageSize(buffer); + return { + width: result.width, + height: result.height, + type: result.type + }; +} + +export async function resizeImageBuffer( + buffer: Buffer, + relativePath: string, + width: number, + height: number +): Promise { + const ext = path.extname(relativePath).toLowerCase(); + const mime = MIME_BY_EXT[ext]; + + if (!mime) { + return null; + } + + const image = await Jimp.read(buffer); + image.resize({ w: width, h: height }); + return image.getBuffer(mime as any); +} diff --git a/src/index.ts b/src/index.ts new file mode 100644 index 0000000..ee30cb3 --- /dev/null +++ b/src/index.ts @@ -0,0 +1,4 @@ +export { default, optimizeModel, optimizeModelWithOptions } from './modelCompressor'; +export { optimizeModel as compressModel } from './modelCompressor'; +export type { CompressTex, OptimizeModelOptions } from './modelCompressor'; +export { default as compressTexture } from './compressTexture'; diff --git a/src/modelCompressor.ts b/src/modelCompressor.ts new file mode 100644 index 0000000..4ffc14a --- /dev/null +++ b/src/modelCompressor.ts @@ -0,0 +1,1015 @@ +import * as fs from 'fs'; +import * as path from 'path'; +import * as gltfPipe from 'gltf-pipeline'; +import * as mime from 'mime'; +import { vec2, vec3 } from 'gl-matrix'; +import compressTexture from './compressTexture'; +import { readImageMetadata, resizeImageBuffer } from './imageTools'; +import { + isGLTFFile, + readFileBuffer, + readFileJson, + showInfo, + showWarn, + writeFile +} from './utils'; + +export type CompressTex = 'high' | 'medium' | 'low' | 'off'; + +export interface OptimizeModelOptions { + input: string; + output: string; + compressTex?: CompressTex; + toGLB?: boolean; +} + +interface ModelEntity { + iDir: string; + file: string; + isGLB: boolean; + oDir: string; + toGLB: boolean; + compressTex: CompressTex; +} + +function getTypeLength(type: string) { + switch (type) { + case 'SCALAR': + return 1; + case 'VEC2': + return 2; + case 'VEC3': + return 3; + case 'VEC4': + case 'MAT2': + return 4; + case 'MAT3': + return 9; + case 'MAT4': + return 16; + default: + return 0; + } +} + +function getComponentByteLengthAndClass(type: number): [number, new (...args: any[]) => ArrayBufferView] { + switch (type) { + case 5120: + return [1, Int8Array]; + case 5121: + return [1, Uint8Array]; + case 5122: + return [2, Int16Array]; + case 5123: + return [2, Uint16Array]; + case 5125: + return [4, Uint32Array]; + case 5126: + return [4, Float32Array]; + default: + return [4, Float32Array]; + } +} + +function getEntity(filePath: string, outputDir: string): ModelEntity { + const iDir = path.dirname(filePath); + const file = path.basename(filePath); + const isGLB = path.extname(filePath).toLowerCase() === '.glb'; + const inputFolderName = path.basename(path.dirname(filePath)); + const oDir = path.resolve(outputDir, isGLB ? file.replace(/\.glb$/i, '') : inputFolderName); + + return { + iDir, + file, + isGLB, + oDir, + toGLB: false, + compressTex: 'off' + }; +} + +async function processGlTF(entity: ModelEntity): Promise<{ + gltf: any; + buffer: Buffer; + assets: Record; + skip?: boolean; +}> { + let gltf: any; + let separateResources: Record; + const buffers: Record = {}; + + if (!fs.existsSync(entity.oDir)) { + fs.mkdirSync(entity.oDir, { recursive: true }); + } + + if (entity.isGLB) { + const buffer = await readFileBuffer(path.resolve(entity.iDir, entity.file)); + const result = await gltfPipe.glbToGltf(buffer, { + separate: true, + resourceDirectory: entity.iDir + }); + gltf = result.gltf; + separateResources = result.separateResources; + } else { + const json = await readFileJson(path.resolve(entity.iDir, entity.file)); + const result = await gltfPipe.processGltf(json, { + separate: true, + resourceDirectory: entity.iDir + }); + gltf = result.gltf; + separateResources = result.separateResources; + } + + for (const relativePath in separateResources) { + const outputPath = path.resolve(entity.oDir, relativePath); + if (/\.bin$/i.test(outputPath)) { + buffers[relativePath] = separateResources[relativePath]; + } + } + + for (const relativePath in buffers) { + delete separateResources[relativePath]; + } + + if (gltf.extensionsUsed?.includes('WX_processed_model')) { + showInfo('Model was already optimized before, skipping reprocess.'); + return { + gltf, + buffer: Object.values(buffers)[0] || Buffer.alloc(0), + assets: separateResources, + skip: true + }; + } + + showInfo('Parsed model successfully, start processing mesh data...'); + + const buffer = await processMeshes(gltf, buffers); + gltf.buffers = [{ uri: 'buffer.bin', byteLength: buffer.byteLength }]; + gltf.extensionsUsed = gltf.extensionsUsed || []; + gltf.extensionsUsed.push('WX_processed_model'); + + if (entity.compressTex !== 'off') { + gltf.extensionsUsed.push('WX_compressed_textures'); + } + + gltf.extensions = gltf.extensions || {}; + gltf.extensions.WX_processed_model = { + trustMaxAndMin: true, + simpleAttribNodeDontCheckTangent: true + }; + + return { gltf, buffer, assets: separateResources }; +} + +async function processMeshes(gltf: any, buffers: Record) { + if (!gltf.meshes) { + return Buffer.alloc(0); + } + + gltf.bufferViews.forEach((bufferView: any) => { + const sourceBuffer = buffers[gltf.buffers[bufferView.buffer].uri]; + const byteOffset = bufferView.byteOffset || 0; + const start = sourceBuffer.byteOffset + byteOffset; + const end = start + bufferView.byteLength; + bufferView.buffer = sourceBuffer.buffer.slice(start, end); + delete bufferView.byteOffset; + delete bufferView.byteLength; + }); + + const geometries: Record[] = []; + gltf.meshes.forEach((mesh: any) => { + const { primitives, mode } = mesh; + + if (mode && mode !== 4) { + showWarn('Mesh primitive mode is not TRIANGLES (4), skipping it.'); + return; + } + + if (!primitives) { + return; + } + + primitives.forEach((primitive: any) => { + const { attributes, targets } = primitive; + let index = 0; + + for (const geometry of geometries) { + let skip = false; + if (geometry.targets && geometry.targets !== targets) { + skip = true; + } + + if (!skip) { + for (const attrName in attributes) { + if (geometry[attrName] && geometry[attrName] !== attributes[attrName]) { + skip = true; + break; + } + } + } + + if (skip) { + index += 1; + continue; + } + + for (const attrName in attributes) { + if (!geometry[attrName]) { + geometry[attrName] = attributes[attrName]; + } + } + + if (!geometry.targets) { + geometry.targets = targets; + } + + primitive.geometry = index; + index += 1; + break; + } + + if (primitive.geometry === undefined) { + const geometry: any = {}; + for (const attrName in attributes) { + geometry[attrName] = attributes[attrName]; + } + if (targets) { + geometry.targets = targets; + } + geometries.push(geometry); + primitive.geometry = geometries.length - 1; + } + }); + }); + + gltf.meshes.forEach((mesh: any) => { + processMesh(mesh, gltf.accessors, gltf.materials || [], gltf.bufferViews, geometries); + }); + + showInfo('Generated missing normal/tangent data, start repacking geometry buffers...'); + + const geometryBuffers: { buffer: ArrayBuffer; stride: number }[] = []; + let geometryIndex = 0; + geometries.forEach((geometry) => { + geometryBuffers.push(...processGeometry(geometryIndex, geometry, gltf.accessors, gltf.bufferViews)); + geometryIndex = geometryBuffers.length; + }); + + showInfo('Repacked geometry data, combining final buffers...'); + return processBuffers(gltf.accessors, gltf.bufferViews, geometryBuffers); +} + +function processGeometry(index: number, geometry: any, accessors: any, bufferViews: any) { + let maxCount = 0; + let stride = 0; + const bytesAttrMap: { attrIdx: number; stride: number }[] = []; + + function calcAttr(attrIdx: number) { + const accessor = accessors[attrIdx]; + let size = getComponentByteLengthAndClass(accessor.componentType)[0] * getTypeLength(accessor.type); + size = size % 4 === 0 ? size : (Math.floor(size / 4) + 1) * 4; + bytesAttrMap.push({ attrIdx, stride: size }); + stride += size; + maxCount = Math.max(accessor.count, maxCount); + } + + Object.keys(geometry).forEach((attrKey) => { + if (attrKey === 'targets') { + geometry[attrKey].forEach((target: any) => { + Object.keys(target).forEach((key) => { + calcAttr(target[key]); + }); + }); + return; + } + + calcAttr(geometry[attrKey]); + }); + + if (stride > 252 * 2) { + throw new Error(`Too many vertex attributes, byteStride=${stride} exceeds supported split threshold.`); + } + + let subStride = 0; + let subMaps: { attrIdx: number; stride: number }[][] = []; + + function processAttr(attrIdx: number, subIndex: number, buffer: ArrayBuffer, offset: number) { + const accessor = accessors[attrIdx]; + const [componentByteLength, TypedArrayClass] = getComponentByteLengthAndClass(accessor.componentType); + const count = getTypeLength(accessor.type); + const perLen = subStride / componentByteLength; + const view = new TypedArrayClass(buffer, offset) as Float32Array; + const bufferView = bufferViews[accessor.bufferView]; + const origPerLen = bufferView ? (bufferView.byteStride || (componentByteLength * count)) / componentByteLength : count; + const origView = ( + bufferView + ? new TypedArrayClass(bufferView.buffer, accessor.byteOffset || 0) + : new TypedArrayClass(accessor.count * count) + ) as Float32Array; + + const max = new Array(count).fill(-Infinity); + const min = new Array(count).fill(Infinity); + + for (let i = 0; i < accessor.count; i += 1) { + for (let k = 0; k < count; k += 1) { + const value = origView[i * origPerLen + k]; + view[i * perLen + k] = value; + max[k] = Math.max(value, max[k]); + min[k] = Math.min(value, min[k]); + } + } + + accessor.geometryIndex = index + subIndex; + accessor.count = maxCount; + accessor.max = max; + accessor.min = min; + accessor.byteOffset = offset; + + const size = componentByteLength * count; + offset += size % 4 === 0 ? size : (Math.floor(size / 4) + 1) * 4; + return offset; + } + + if (stride <= 252) { + subStride = stride; + subMaps = [bytesAttrMap]; + } else { + bytesAttrMap.sort((a, b) => a.stride - b.stride).reverse(); + subMaps = [[], []]; + const sums = [0, 0]; + + bytesAttrMap.forEach((item) => { + const targetIndex = sums[0] <= sums[1] ? 0 : 1; + subMaps[targetIndex].push(item); + sums[targetIndex] += item.stride; + }); + + subStride = Math.max(sums[0], sums[1]); + const diff = sums[0] - sums[1]; + + if (subStride > 252 || diff % 4 !== 0 || Math.abs(diff) > 16) { + throw new Error(`Failed to split long vertex stride, subStride=${subStride}, diff=${diff}.`); + } + + if (diff !== 0) { + const subIndex = diff > 0 ? 1 : 0; + const paddingStride = Math.abs(diff); + accessors.push({ + componentType: 5126, + count: maxCount, + type: paddingStride === 4 + ? 'SCALAR' + : paddingStride === 8 + ? 'VEC2' + : paddingStride === 12 + ? 'VEC3' + : 'VEC4', + geometryIndex: index + subIndex + }); + subMaps[subIndex].push({ attrIdx: accessors.length - 1, stride: paddingStride }); + } + } + + const result = subMaps.map(() => ({ + stride: subStride, + buffer: Buffer.alloc(maxCount * subStride).buffer + })); + + subMaps.forEach((map, subIndex) => { + let offset = 0; + const buffer = result[subIndex].buffer; + map.forEach(({ attrIdx }) => { + offset = processAttr(attrIdx, subIndex, buffer, offset); + }); + }); + + return result; +} + +function processBuffers( + accessors: any, + bufferViews: any, + geometryBuffers: { buffer: ArrayBuffer; stride: number }[] +) { + let totalLen = 0; + const geoBufferViews = new Set(); + const bufferViewCache = new Set(); + + accessors.forEach((accessor: any) => { + if (accessor.geometryIndex !== undefined) { + if (accessor.bufferView !== undefined) { + geoBufferViews.add(accessor.bufferView); + } + if (!bufferViewCache.has(`g-${accessor.geometryIndex}`)) { + totalLen += geometryBuffers[accessor.geometryIndex].buffer.byteLength; + bufferViewCache.add(`g-${accessor.geometryIndex}`); + } + } else if (!bufferViewCache.has(accessor.bufferView)) { + totalLen += bufferViews[accessor.bufferView].buffer.byteLength; + bufferViewCache.add(accessor.bufferView); + } + + if (totalLen % 4) { + totalLen += 4 - (totalLen % 4); + } + }); + + const buffer = Buffer.alloc(totalLen); + const originalBufferViews = new Set(); + const reusableGeoBufferViews = Array.from(geoBufferViews); + const geoBufferViewCache: Record = {}; + bufferViewCache.clear(); + + let offset = 0; + accessors.forEach((accessor: any) => { + let sourceBuffer: ArrayBuffer; + let bufferView: any; + originalBufferViews.add(accessor.bufferView); + + if (accessor.geometryIndex === undefined && !bufferViewCache.has(accessor.bufferView)) { + bufferView = bufferViews[accessor.bufferView]; + sourceBuffer = bufferView.buffer; + bufferViewCache.add(accessor.bufferView); + } else if (accessor.geometryIndex !== undefined) { + const cacheKey = `g-${accessor.geometryIndex}`; + + if (geoBufferViewCache[cacheKey] !== undefined) { + accessor.bufferView = geoBufferViewCache[cacheKey]; + delete accessor.geometryIndex; + return; + } + + const { buffer: geometryBuffer, stride } = geometryBuffers[accessor.geometryIndex]; + delete accessor.geometryIndex; + bufferView = { + target: 34962, + byteStride: stride + }; + sourceBuffer = geometryBuffer; + + if (reusableGeoBufferViews.length) { + geoBufferViewCache[cacheKey] = reusableGeoBufferViews.shift()!; + } else { + bufferViews.push(null); + geoBufferViewCache[cacheKey] = bufferViews.length - 1; + } + + accessor.bufferView = geoBufferViewCache[cacheKey]; + bufferViews[accessor.bufferView] = bufferView; + } else { + return; + } + + buffer.set(Buffer.from(sourceBuffer), offset); + bufferView.byteOffset = offset; + bufferView.buffer = 0; + bufferView.byteLength = sourceBuffer.byteLength; + offset += sourceBuffer.byteLength; + + if (offset % 4) { + offset += 4 - (offset % 4); + } + }); + + accessors.forEach((accessor: any) => { + if (originalBufferViews.has(accessor.bufferView)) { + originalBufferViews.delete(accessor.bufferView); + } + }); + + originalBufferViews.forEach((bufferViewId) => { + delete bufferViews[bufferViewId].byteStride; + bufferViews[bufferViewId].buffer = 0; + bufferViews[bufferViewId].byteOffset = 0; + bufferViews[bufferViewId].byteLength = 1; + }); + + return buffer; +} + +function processMesh( + mesh: any, + accessors: any, + materials: any[], + bufferViews: any, + geometries: Record[] +) { + mesh.primitives?.forEach((primitive: any) => { + const { attributes, material, indices } = primitive; + + if (!attributes) { + return; + } + + const geometryIndex = primitive.geometry; + const geometry = geometries[geometryIndex]; + delete primitive.geometry; + + if (!geometry) { + return; + } + + const materialData = materials?.[material]; + if ((materialData?.normalTexture && geometry.TANGENT === undefined) || geometry.NORMAL === undefined) { + if (!geometry.TEXCOORD_0) { + showWarn('Cannot generate normal/tangent data because TEXCOORD_0 is missing.'); + } else if (indices === undefined) { + showWarn('Cannot generate normal/tangent data because indices are missing.'); + } else { + const indexAccessor = accessors[indices]; + const IndexArrayClass = getComponentByteLengthAndClass(indexAccessor.componentType)[1]; + const indexBuffer = new IndexArrayClass(bufferViews[indexAccessor.bufferView].buffer) as Uint16Array; + + if (geometry.NORMAL === undefined) { + showInfo('Generating vertex normals...'); + generateNormal(geometry, indexBuffer, bufferViews, accessors); + } + + if (geometry.TANGENT === undefined && materialData?.normalTexture) { + showInfo('Generating tangents...'); + generateTangent(geometry, indexBuffer, bufferViews, accessors); + } + } + } + + const { targets, ...attrs } = geometry; + primitive.attributes = attrs; + if (targets) { + primitive.targets = targets; + } + }); +} + +function generateNormal(geometry: Record, indexBuffer: Uint16Array, bufferViews: any, accessors: any) { + const { buffer: positions, per: positionStride, count } = getAttr(geometry.POSITION, bufferViews, accessors); + const normalsBuffer = Buffer.alloc(count * 3 * 4); + const normals = new Float32Array(normalsBuffer.buffer); + const vertexFaceNormals: vec3[][] = Array.from({ length: count }, () => []); + + for (let i = 0; i < indexBuffer.length; i += 3) { + const vertexIndexes = [indexBuffer[i], indexBuffer[i + 1], indexBuffer[i + 2]]; + const positionVectors = vertexIndexes.map((vertexIndex) => + new Float32Array(3).map((_, offset) => positions[vertexIndex * positionStride + offset]) + ); + + const edge0 = vec3.sub(vec3.create(), positionVectors[0], positionVectors[1]); + const edge1 = vec3.sub(vec3.create(), positionVectors[0], positionVectors[2]); + const normal = vec3.cross(vec3.create(), edge0, edge1); + + vertexIndexes.forEach((vertexIndex) => { + vertexFaceNormals[vertexIndex].push(normal); + }); + } + + vertexFaceNormals.forEach((faceNormals, index) => { + const normal = faceNormals.reduce((previous, current) => vec3.add(previous, previous, current), vec3.create()); + if (faceNormals.length > 0) { + vec3.scale(normal, normal, 1 / faceNormals.length); + } + if (vec3.length(normal) > 0) { + vec3.normalize(normal, normal); + } + normals.set(normal, index * 3); + }); + + bufferViews.push({ + buffer: normalsBuffer.buffer, + target: 34963, + byteOffset: 0, + byteLength: normalsBuffer.byteLength + }); + + accessors.push({ + bufferView: bufferViews.length - 1, + componentType: 5126, + count, + type: 'VEC3' + }); + + geometry.NORMAL = accessors.length - 1; +} + +function generateTangent(geometry: Record, indexBuffer: Uint16Array, bufferViews: any, accessors: any) { + const { buffer: positions, per: positionStride, count } = getAttr(geometry.POSITION, bufferViews, accessors); + const { buffer: uvs, per: uvStride } = getAttr(geometry.TEXCOORD_0, bufferViews, accessors); + const { buffer: normals, per: normalStride } = getAttr(geometry.NORMAL, bufferViews, accessors); + const tangentBuffer = Buffer.alloc(count * 4 * 4); + const tangents = new Float32Array(tangentBuffer.buffer); + const vertexFaceTangents: vec3[][] = Array.from({ length: count }, () => []); + + for (let i = 0; i < indexBuffer.length; i += 3) { + const vertexIndexes = [indexBuffer[i], indexBuffer[i + 1], indexBuffer[i + 2]]; + const positionVectors = vertexIndexes.map((vertexIndex) => + new Float32Array(3).map((_, offset) => positions[vertexIndex * positionStride + offset]) + ); + const uvVectors = vertexIndexes.map((vertexIndex) => + new Float32Array(2).map((_, offset) => uvs[vertexIndex * uvStride + offset]) + ); + + const edge0 = vec3.sub(vec3.create(), positionVectors[0], positionVectors[1]); + const edge1 = vec3.sub(vec3.create(), positionVectors[0], positionVectors[2]); + const deltaUV0 = vec2.sub(vec2.create(), uvVectors[0], uvVectors[1]); + const deltaUV1 = vec2.sub(vec2.create(), uvVectors[0], uvVectors[2]); + const det = deltaUV0[0] * deltaUV1[1] - deltaUV0[1] * deltaUV1[0]; + let tangent = vec3.create(); + + if (Math.abs(det) > 0) { + const xAxisInUVSpace = [deltaUV1[1], -deltaUV0[1]]; + tangent = vec3.add( + tangent, + vec3.scale(edge0, edge0, xAxisInUVSpace[0]), + vec3.scale(edge1, edge1, xAxisInUVSpace[1]) + ); + } + + vertexIndexes.forEach((vertexIndex) => { + vertexFaceTangents[vertexIndex].push(tangent); + }); + } + + vertexFaceTangents.forEach((faceTangents, index) => { + const tangent = faceTangents.reduce((previous, current) => vec3.add(previous, previous, current), vec3.create()); + if (faceTangents.length > 0) { + vec3.scale(tangent, tangent, 1 / faceTangents.length); + } + + const normal = new Float32Array(3).map((_, offset) => normals[index * normalStride + offset]); + const finalTangent = vec3.cross(tangent, tangent, normal); + + if (vec3.length(finalTangent) > 0) { + vec3.normalize(finalTangent, finalTangent); + } + + tangents.set(finalTangent, index * 4); + tangents[index * 4 + 3] = 1; + }); + + bufferViews.push({ + buffer: tangentBuffer.buffer, + target: 34963, + byteOffset: 0, + byteLength: tangentBuffer.byteLength + }); + + accessors.push({ + bufferView: bufferViews.length - 1, + componentType: 5126, + count, + type: 'VEC4' + }); + + geometry.TANGENT = accessors.length - 1; +} + +function getAttr(index: number, bufferViews: any, accessors: any) { + const { byteOffset = 0, bufferView, componentType, type, count } = accessors[index]; + const { buffer, byteStride } = bufferViews[bufferView]; + const stride = byteStride || (getComponentByteLengthAndClass(componentType)[0] * getTypeLength(type)); + + return { + buffer: new Float32Array(buffer, byteOffset), + per: stride / 4, + count + }; +} + +async function generateGLB( + gltf: any, + buffer: Buffer, + compressTex: boolean, + assets: Record +) { + let offset = buffer.byteLength; + const { buffer0, images } = combineImages(gltf, compressTex, offset, assets as Record); + + offset = buffer0.byteLength; + const bufferViews = gltf.bufferViews; + const assetPaths = Object.keys(assets); + const assetToBufferView: Record = {}; + const binaryChunks = [buffer0]; + + assetPaths.forEach((relativePath) => { + let assetBuffer = assets[relativePath]; + if (typeof assetBuffer === 'string') { + assetBuffer = Buffer.from(assetBuffer); + } + + assetBuffer = Buffer.concat([assetBuffer, align4(assetBuffer)]); + bufferViews.push({ buffer: 0, byteOffset: offset, byteLength: assetBuffer.byteLength }); + assetToBufferView[relativePath] = bufferViews.length - 1; + offset += assetBuffer.byteLength; + binaryChunks.push(assetBuffer); + }); + + gltf.shaders?.forEach((shader: any) => { + if (assetToBufferView[shader.uri] === undefined) { + return; + } + + shader.bufferView = assetToBufferView[shader.uri]; + delete shader.uri; + }); + + const mergedBinary = Buffer.concat(binaryChunks); + const finalBuffer = Buffer.concat([buffer, mergedBinary]); + const finalBufferAlign = align4(finalBuffer); + + gltf.buffers = [{ byteLength: buffer.byteLength + mergedBinary.byteLength }]; + if (images) { + images.forEach(({ uri, type, buffer: imageBuffer }) => { + gltf.buffers.push({ + uri, + byteLength: imageBuffer.length, + extensions: { + WX_compressed_textures: { type } + } + }); + }); + } + + const json = Buffer.from(JSON.stringify(gltf)); + const jsonAlign = align4(json); + + const glb = Buffer.concat([ + new Uint8Array(new Uint32Array([ + 0x46546c67, + 2, + 28 + json.byteLength + jsonAlign.byteLength + finalBuffer.byteLength + finalBufferAlign.byteLength, + json.byteLength + jsonAlign.byteLength, + 0x4e4f534a + ]).buffer), + json, + jsonAlign, + new Uint8Array(new Uint32Array([ + finalBuffer.byteLength + finalBufferAlign.byteLength, + 0x004e4942 + ]).buffer), + finalBuffer, + finalBufferAlign + ]); + + return { glb, images }; +} + +function getImageExtension(data: Buffer) { + const header = data.slice(0, 2); + const webpHeaderRIFF = data.slice(0, 4); + const webpHeaderWEBP = data.slice(8, 12); + + if (header.equals(Buffer.from([0x42, 0x4d]))) { + return '.bmp'; + } + if (header.equals(Buffer.from([0x47, 0x49]))) { + return '.gif'; + } + if (header.equals(Buffer.from([0xff, 0xd8]))) { + return '.jpg'; + } + if (header.equals(Buffer.from([0x89, 0x50]))) { + return '.png'; + } + if (header.equals(Buffer.from([0xab, 0x4b]))) { + return '.ktx'; + } + if (header.equals(Buffer.from([0x48, 0x78]))) { + return '.crn'; + } + if ( + webpHeaderRIFF.equals(Buffer.from([0x52, 0x49, 0x46, 0x46])) && + webpHeaderWEBP.equals(Buffer.from([0x57, 0x45, 0x42, 0x50])) + ) { + return '.webp'; + } + + throw new Error('Image data does not have a valid header.'); +} + +function combineImages( + gltf: any, + compressTex: boolean, + offset: number, + assets: Record +) { + const buffers: Buffer[] = new Array(compressTex ? 6 : 1).fill(Buffer.alloc(0)); + const bufferViews = gltf.bufferViews; + const sources = compressTex + ? { orig: 1, astc: 2, pvrtc: 3, etc: 4, s3tc: 5 } + : { orig: 0 }; + const offsets = { + orig: compressTex ? 0 : offset, + astc: 0, + pvrtc: 0, + etc: 0, + s3tc: 0 + }; + const types = compressTex + ? (['orig', 'astc', 'pvrtc', 'etc', 's3tc'] as const) + : (['orig'] as const); + + gltf.images?.forEach((image: any) => { + types.forEach((type) => { + const imageEntry = type === 'orig' ? image : image.extensions.WX_compressed_textures[type]; + let imageBuffer = assets[imageEntry.uri]; + imageBuffer = Buffer.concat([imageBuffer, align4(imageBuffer)]); + const sourceIndex = sources[type]; + buffers[sourceIndex] = Buffer.concat([buffers[sourceIndex], imageBuffer]); + bufferViews.push({ buffer: sourceIndex, byteOffset: offsets[type], byteLength: imageBuffer.byteLength }); + imageEntry.mimeType = (mime as any).getType(getImageExtension(imageBuffer)); + imageEntry.bufferView = bufferViews.length - 1; + offsets[type] += imageBuffer.byteLength; + delete assets[imageEntry.uri]; + delete imageEntry.uri; + }); + }); + + return { + buffer0: buffers[0], + images: !compressTex + ? undefined + : types.map((type) => ({ + type, + uri: `textures-${type}.bin`, + buffer: buffers[sources[type]] + })) + }; +} + +function align4(buffer: Buffer | ArrayBuffer) { + const delta = buffer.byteLength % 4; + return delta ? Buffer.alloc(4 - delta).fill(0x20) : Buffer.alloc(0); +} + +async function processTextures(entity: ModelEntity, gltf: any, assets: Record) { + const { images, textures, materials } = gltf; + if (!Array.isArray(textures) || !textures.length || !Array.isArray(images) || !images.length) { + return; + } + + for (const material of materials || []) { + const normalTexture = textures[material.normalTexture?.index]; + if (normalTexture) { + normalTexture.extras = normalTexture.extras || {}; + normalTexture.extras.isNormalMap = true; + } + } + + const processedImages = new Set(); + for (const texture of textures) { + let repeat = true; + + if (texture.sampler !== undefined) { + const sampler = gltf.samplers?.[texture.sampler] || {}; + const wrapS = sampler.wrapS || 10497; + const wrapT = sampler.wrapT || 10497; + repeat = wrapS === 10497 || wrapT === 10497; + } + + if (processedImages.has(texture.source)) { + continue; + } + + const image = images[texture.source]; + const relativePath: string = image.uri; + + if (repeat || entity.compressTex !== 'off') { + assets[relativePath] = await checkPOTandConvert(assets[relativePath], relativePath); + } + + if (entity.compressTex !== 'off') { + const compressed = await compressTexture( + relativePath, + assets[relativePath], + entity.compressTex, + !!image.extras?.isNormalMap + ); + const basePath = relativePath.replace(path.extname(relativePath), ''); + image.extensions = image.extensions || {}; + const textureExtension = image.extensions.WX_compressed_textures = {}; + + (['astc', 'etc', 'pvrtc', 's3tc'] as const).forEach((type) => { + const uri = `${basePath}-${type}.ktx`; + assets[uri] = compressed[type]; + textureExtension[type] = { uri }; + }); + } + + processedImages.add(texture.source); + } +} + +async function checkPOTandConvert(imageBuffer: Buffer, relativePath: string): Promise { + const info = readImageMetadata(imageBuffer); + if (!info.width || !info.height) { + showWarn(`Cannot inspect image size for '${relativePath}', skip POT resize.`); + return imageBuffer; + } + + const width = getPOT(info.width); + const height = getPOT(info.height); + + if (width === info.width && height === info.height) { + return imageBuffer; + } + + showInfo(`Resize repeat texture to POT: '${relativePath}' [${info.width}, ${info.height}] -> [${width}, ${height}]`); + const resized = await resizeImageBuffer(imageBuffer, relativePath, width, height); + + if (!resized) { + showWarn(`Image format of '${relativePath}' is not supported by the JS resizer, keep original texture.`); + return imageBuffer; + } + + return resized; +} + +function getPOT(size: number): number { + const log = Math.log2(size); + const integer = ~~log; + const delta = log % 1; + return Math.pow(2, delta < 0.4 ? integer : integer + 1); +} + +async function execOne(entity: ModelEntity) { + showInfo(`Start processing ${path.join(entity.iDir, entity.file)}`); + + const { gltf, buffer, assets, skip } = await processGlTF(entity); + if (skip) { + throw new Error('Model has already been optimized and cannot be optimized twice.'); + } + + showInfo('Processing textures and optional compression...'); + await processTextures(entity, gltf, assets); + + let outputFile = ''; + if (entity.toGLB) { + showInfo('Generating GLB...'); + const { glb, images } = await generateGLB(gltf, buffer, entity.compressTex !== 'off', assets); + outputFile = path.resolve(entity.oDir, 'index.glb'); + await writeFile(outputFile, glb); + + if (images) { + for (const image of images) { + await writeFile(path.resolve(entity.oDir, image.uri), image.buffer); + } + } + + showInfo('GLB generation complete.'); + } else { + showInfo(`Writing optimized output to ${entity.oDir}`); + outputFile = path.resolve(entity.oDir, 'index.gltf'); + await writeFile(outputFile, JSON.stringify(gltf, undefined, 2)); + await writeFile(path.resolve(entity.oDir, 'buffer.bin'), buffer); + + for (const relativePath in assets) { + await writeFile(path.resolve(entity.oDir, relativePath), assets[relativePath]); + } + + showInfo('Output files written.'); + } + + showInfo( + `Completed ${path.join(entity.iDir, entity.file)} -> ${path.join(entity.oDir, `index.${entity.toGLB || entity.isGLB ? 'glb' : 'gltf'}`)}` + ); + + return outputFile; +} + +export async function optimizeModel( + input: string, + output: string, + compressTex: CompressTex = 'off', + toGLB = false +) { + if (!input || !output) { + throw new Error('Both input and output paths are required.'); + } + + if (!fs.existsSync(input)) { + throw new Error(`Input path does not exist: '${input}'.`); + } + + if (!fs.existsSync(output)) { + throw new Error(`Output path does not exist: '${output}'.`); + } + + if (!isGLTFFile(input)) { + throw new Error(`'${input}' is not a .gltf or .glb file.`); + } + + const entity = getEntity(input, output); + entity.toGLB = toGLB; + entity.compressTex = compressTex; + + return execOne(entity); +} + +export async function optimizeModelWithOptions(options: OptimizeModelOptions) { + return optimizeModel( + options.input, + options.output, + options.compressTex || 'off', + !!options.toGLB + ); +} + +export default optimizeModel; diff --git a/src/utils.ts b/src/utils.ts new file mode 100644 index 0000000..dd914da --- /dev/null +++ b/src/utils.ts @@ -0,0 +1,65 @@ +import * as fs from 'fs'; +import * as path from 'path'; + +export function showWarn(message: string) { + console.error('\x1b[33m%s\x1b[0m', `Warn: ${message}`); +} + +export function showInfo(message: string) { + console.info('\x1b[32m%s\x1b[0m', message); +} + +const GLTF_EXTENSIONS = new Set(['.gltf', '.glb']); + +export function isGLTFFile(filePath: string) { + return GLTF_EXTENSIONS.has(path.extname(filePath).toLowerCase()); +} + +export async function readFileJson(filePath: string): Promise { + return new Promise((resolve, reject) => { + fs.readFile(filePath, { encoding: 'utf8' }, (error, content) => { + if (error) { + reject(error); + return; + } + + resolve(JSON.parse(content)); + }); + }); +} + +export async function readFileBuffer(filePath: string): Promise { + return new Promise((resolve, reject) => { + fs.readFile(filePath, (error, content) => { + if (error) { + reject(error); + return; + } + + resolve(content); + }); + }); +} + +export async function writeFile(filePath: string, buffer: Buffer | string): Promise { + return new Promise((resolve, reject) => { + const dirPath = path.dirname(filePath); + if (!fs.existsSync(dirPath)) { + fs.mkdirSync(dirPath, { recursive: true }); + } + + fs.writeFile( + filePath, + buffer, + typeof buffer === 'string' ? { encoding: 'utf8' } : {}, + (error) => { + if (error) { + reject(error); + return; + } + + resolve(filePath); + } + ); + }); +} diff --git a/tsconfig.json b/tsconfig.json new file mode 100644 index 0000000..d0e55aa --- /dev/null +++ b/tsconfig.json @@ -0,0 +1,17 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "CommonJS", + "declaration": true, + "outDir": "./dist", + "rootDir": "./src", + "strict": false, + "esModuleInterop": true, + "skipLibCheck": true, + "forceConsistentCasingInFileNames": true, + "resolveJsonModule": true + }, + "include": [ + "src/**/*" + ] +}