增加转格式

lib/utils/gltf.js

@@ -0,0 +1,82 @@
+import fs from "fs";
+
+export const BACKUP_SUFFIX = "_备份";
+
+// 检查当前目录是否有 gltf 文件
+export function hasGltfFile() {
+  return listGltfFiles().length > 0;
+}
+
+// 获取当前目录下可用的 gltf 文件列表
+export function listGltfFiles() {
+  const cwd = process.cwd();
+  return fs.readdirSync(cwd).filter(f => f.toLowerCase().endsWith(".gltf") && !f.includes(BACKUP_SUFFIX));
+}
+
+// 获取 glTF / GLB 模型文件
+export function listModelFiles() {
+  const cwd = process.cwd();
+  return fs
+    .readdirSync(cwd)
+    .filter(file => /\.(gltf|glb)$/i.test(file) && !file.includes(BACKUP_SUFFIX));
+}
+
+// 获取所有支持的模型文件（包括需要转换的格式）
+export function listAllModelFiles() {
+  const cwd = process.cwd();
+  return fs
+    .readdirSync(cwd)
+    .filter(file => /\.(gltf|glb|obj|fbx)$/i.test(file) && !file.includes(BACKUP_SUFFIX));
+}
+
+// 判断是否需要先转换
+export function needsConversion(file) {
+  return /\.(obj|fbx)$/i.test(file);
+}
+
+// 检查是否满足执行条件（有 ktx2、gltf、bin 文件）
+export function checkRequiredFiles() {
+  const cwd = process.cwd();
+  const files = fs.readdirSync(cwd);
+  const hasKtx2 = files.some(f => f.toLowerCase().endsWith(".ktx2"));
+  const hasGltf = files.some(f => f.toLowerCase().endsWith(".gltf"));
+  const hasBin = files.some(f => f.toLowerCase().endsWith(".bin"));
+
+  const missing = [];
+  if (!hasKtx2) missing.push("ktx2");
+  if (!hasGltf) missing.push("gltf");
+  if (!hasBin) missing.push("bin");
+
+  return { ok: missing.length === 0, missing };
+}
+
+// 修改 gltf 文件，根据选项添加扩展
+export function modifyGltfContent(gltfPath, options = ["textureBasisu"]) {
+  const content = fs.readFileSync(gltfPath, "utf-8");
+  const gltf = JSON.parse(content);
+
+  if (options.includes("textureBasisu")) {
+    if (!gltf.extensionsUsed) gltf.extensionsUsed = [];
+    if (!gltf.extensionsUsed.includes("KHR_texture_basisu")) {
+      gltf.extensionsUsed.push("KHR_texture_basisu");
+    }
+
+    if (gltf.textures) {
+      gltf.textures = gltf.textures.map(tex => ({
+        extensions: { KHR_texture_basisu: { source: tex.source } }
+      }));
+    }
+
+    if (gltf.images) {
+      gltf.images = gltf.images.map(img => {
+        const uri = img.uri || "";
+        const newUri = uri.replace(/\.(png|jpg|jpeg|webp|tga)$/i, ".ktx2");
+        return { uri: newUri, mimeType: "image/ktx2" };
+      });
+    }
+  }
+
+  // placeholder1, placeholder2, placeholder3 预留扩展点
+
+  return gltf;
+}