Add existing to tracked

node_modules/obj2gltf/lib/gltfToGlb.js

@@ -0,0 +1,61 @@
+"use strict";
+const Cesium = require("cesium");
+const getJsonBufferPadded = require("./getJsonBufferPadded");
+
+const defined = Cesium.defined;
+
+module.exports = gltfToGlb;
+
+/**
+ * Convert a glTF to binary glTF.
+ *
+ * The glTF is expected to have a single buffer and all embedded resources stored in bufferViews.
+ *
+ * @param {Object} gltf The glTF asset.
+ * @param {Buffer} binaryBuffer The binary buffer.
+ * @returns {Buffer} The glb buffer.
+ *
+ * @private
+ */
+function gltfToGlb(gltf, binaryBuffer) {
+  const buffer = gltf.buffers[0];
+  if (defined(buffer.uri)) {
+    binaryBuffer = Buffer.alloc(0);
+  }
+
+  // Create padded binary scene string
+  const jsonBuffer = getJsonBufferPadded(gltf);
+
+  // Allocate buffer (Global header) + (JSON chunk header) + (JSON chunk) + (Binary chunk header) + (Binary chunk)
+  const glbLength = 12 + 8 + jsonBuffer.length + 8 + binaryBuffer.length;
+  const glb = Buffer.alloc(glbLength);
+
+  // Write binary glTF header (magic, version, length)
+  let byteOffset = 0;
+  glb.writeUInt32LE(0x46546c67, byteOffset);
+  byteOffset += 4;
+  glb.writeUInt32LE(2, byteOffset);
+  byteOffset += 4;
+  glb.writeUInt32LE(glbLength, byteOffset);
+  byteOffset += 4;
+
+  // Write JSON Chunk header (length, type)
+  glb.writeUInt32LE(jsonBuffer.length, byteOffset);
+  byteOffset += 4;
+  glb.writeUInt32LE(0x4e4f534a, byteOffset); // JSON
+  byteOffset += 4;
+
+  // Write JSON Chunk
+  jsonBuffer.copy(glb, byteOffset);
+  byteOffset += jsonBuffer.length;
+
+  // Write Binary Chunk header (length, type)
+  glb.writeUInt32LE(binaryBuffer.length, byteOffset);
+  byteOffset += 4;
+  glb.writeUInt32LE(0x004e4942, byteOffset); // BIN
+  byteOffset += 4;
+
+  // Write Binary Chunk
+  binaryBuffer.copy(glb, byteOffset);
+  return glb;
+}