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diff --git a/indra/newview/gltf/accessor.cpp b/indra/newview/gltf/accessor.cpp
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+/**
+ * @file accessor.cpp
+ * @brief LL GLTF Implementation
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
+ * $/LicenseInfo$
+ */
+
+#include "../llviewerprecompiledheaders.h"
+
+#include "asset.h"
+#include "buffer_util.h"
+#include "llfilesystem.h"
+
+using namespace LL::GLTF;
+using namespace boost::json;
+
+namespace LL
+{
+ namespace GLTF
+ {
+ Accessor::Type gltf_type_to_enum(const std::string& type)
+ {
+ if (type == "SCALAR")
+ {
+ return Accessor::Type::SCALAR;
+ }
+ else if (type == "VEC2")
+ {
+ return Accessor::Type::VEC2;
+ }
+ else if (type == "VEC3")
+ {
+ return Accessor::Type::VEC3;
+ }
+ else if (type == "VEC4")
+ {
+ return Accessor::Type::VEC4;
+ }
+ else if (type == "MAT2")
+ {
+ return Accessor::Type::MAT2;
+ }
+ else if (type == "MAT3")
+ {
+ return Accessor::Type::MAT3;
+ }
+ else if (type == "MAT4")
+ {
+ return Accessor::Type::MAT4;
+ }
+
+ LL_WARNS("GLTF") << "Unknown accessor type: " << type << LL_ENDL;
+ llassert(false);
+
+ return Accessor::Type::SCALAR;
+ }
+
+ std::string enum_to_gltf_type(Accessor::Type type)
+ {
+ switch (type)
+ {
+ case Accessor::Type::SCALAR:
+ return "SCALAR";
+ case Accessor::Type::VEC2:
+ return "VEC2";
+ case Accessor::Type::VEC3:
+ return "VEC3";
+ case Accessor::Type::VEC4:
+ return "VEC4";
+ case Accessor::Type::MAT2:
+ return "MAT2";
+ case Accessor::Type::MAT3:
+ return "MAT3";
+ case Accessor::Type::MAT4:
+ return "MAT4";
+ }
+
+ LL_WARNS("GLTF") << "Unknown accessor type: " << (S32)type << LL_ENDL;
+ llassert(false);
+
+ return "SCALAR";
+ }
+ }
+}
+
+void Buffer::erase(Asset& asset, S32 offset, S32 length)
+{
+ S32 idx = (S32)(this - &asset.mBuffers[0]);
+
+ mData.erase(mData.begin() + offset, mData.begin() + offset + length);
+
+ llassert(mData.size() <= size_t(INT_MAX));
+ mByteLength = S32(mData.size());
+
+ for (BufferView& view : asset.mBufferViews)
+ {
+ if (view.mBuffer == idx)
+ {
+ if (view.mByteOffset >= offset)
+ {
+ view.mByteOffset -= length;
+ }
+ }
+ }
+}
+
+bool Buffer::prep(Asset& asset)
+{
+ if (mByteLength == 0)
+ {
+ return false;
+ }
+
+ LLUUID id;
+ if (mUri.size() == UUID_STR_SIZE && LLUUID::parseUUID(mUri, &id) && id.notNull())
+ { // loaded from an asset, fetch the buffer data from the asset store
+ LLFileSystem file(id, LLAssetType::AT_GLTF_BIN, LLFileSystem::READ);
+
+ if (mByteLength > file.getSize())
+ {
+ LL_WARNS("GLTF") << "Unexpected glbin size: " << id << " is " << file.getSize() << " bytes, expected " << mByteLength << LL_ENDL;
+ return false;
+ }
+
+ mData.resize(mByteLength);
+ if (!file.read((U8*)mData.data(), mByteLength))
+ {
+ LL_WARNS("GLTF") << "Failed to load buffer data from asset: " << id << LL_ENDL;
+ return false;
+ }
+ }
+ else if (mUri.find("data:") == 0)
+ { // loaded from a data URI, load the texture from the data
+ LL_WARNS() << "Data URIs not yet supported" << LL_ENDL;
+ return false;
+ }
+ else if (!asset.mFilename.empty() &&
+ !mUri.empty()) // <-- uri could be empty if we're loading from .glb
+ {
+ std::string dir = gDirUtilp->getDirName(asset.mFilename);
+ std::string bin_file = dir + gDirUtilp->getDirDelimiter() + mUri;
+
+ std::ifstream file(bin_file, std::ios::binary);
+ if (!file.is_open())
+ {
+ LL_WARNS("GLTF") << "Failed to open file: " << bin_file << LL_ENDL;
+ return false;
+ }
+
+ file.seekg(0, std::ios::end);
+ if (mByteLength > file.tellg())
+ {
+ LL_WARNS("GLTF") << "Unexpected file size: " << bin_file << " is " << file.tellg() << " bytes, expected " << mByteLength << LL_ENDL;
+ return false;
+ }
+ file.seekg(0, std::ios::beg);
+
+ mData.resize(mByteLength);
+ file.read((char*)mData.data(), mData.size());
+ }
+
+ // POSTCONDITION: on success, mData.size == mByteLength
+ llassert(mData.size() == mByteLength);
+ return true;
+}
+
+bool Buffer::save(Asset& asset, const std::string& folder)
+{
+ if (mUri.substr(0, 5) == "data:")
+ {
+ LL_WARNS("GLTF") << "Data URIs not yet supported" << LL_ENDL;
+ return false;
+ }
+
+ std::string bin_file = folder + gDirUtilp->getDirDelimiter();
+
+ if (mUri.empty())
+ {
+ if (mName.empty())
+ {
+ S32 idx = (S32)(this - &asset.mBuffers[0]);
+ mUri = llformat("buffer_%d.bin", idx);
+ }
+ else
+ {
+ mUri = mName + ".bin";
+ }
+ }
+
+ bin_file += mUri;
+
+ std::ofstream file(bin_file, std::ios::binary);
+ if (!file.is_open())
+ {
+ LL_WARNS("GLTF") << "Failed to open file: " << bin_file << LL_ENDL;
+ return false;
+ }
+
+ file.write((char*)mData.data(), mData.size());
+
+ return true;
+}
+
+void Buffer::serialize(object& dst) const
+{
+ write(mName, "name", dst);
+ write(mUri, "uri", dst);
+ write_always(mByteLength, "byteLength", dst);
+};
+
+const Buffer& Buffer::operator=(const Value& src)
+{
+ if (src.is_object())
+ {
+ copy(src, "name", mName);
+ copy(src, "uri", mUri);
+ copy(src, "byteLength", mByteLength);
+
+ // NOTE: DO NOT attempt to handle the uri here.
+ // The uri is a reference to a file that is not loaded until
+ // after the json document is parsed
+ }
+ return *this;
+}
+
+void BufferView::serialize(object& dst) const
+{
+ write_always(mBuffer, "buffer", dst);
+ write_always(mByteLength, "byteLength", dst);
+ write(mByteOffset, "byteOffset", dst, 0);
+ write(mByteStride, "byteStride", dst, 0);
+ write(mTarget, "target", dst, -1);
+ write(mName, "name", dst);
+}
+
+const BufferView& BufferView::operator=(const Value& src)
+{
+ if (src.is_object())
+ {
+ copy(src, "buffer", mBuffer);
+ copy(src, "byteLength", mByteLength);
+ copy(src, "byteOffset", mByteOffset);
+ copy(src, "byteStride", mByteStride);
+ copy(src, "target", mTarget);
+ copy(src, "name", mName);
+ }
+ return *this;
+}
+
+void Accessor::serialize(object& dst) const
+{
+ write(mName, "name", dst);
+ write(mBufferView, "bufferView", dst, INVALID_INDEX);
+ write(mByteOffset, "byteOffset", dst, 0);
+ write_always(mComponentType, "componentType", dst);
+ write_always(mCount, "count", dst);
+ write_always(enum_to_gltf_type(mType), "type", dst);
+ write(mNormalized, "normalized", dst, false);
+ write(mMax, "max", dst);
+ write(mMin, "min", dst);
+}
+
+const Accessor& Accessor::operator=(const Value& src)
+{
+ if (src.is_object())
+ {
+ copy(src, "name", mName);
+ copy(src, "bufferView", mBufferView);
+ copy(src, "byteOffset", mByteOffset);
+ copy(src, "componentType", mComponentType);
+ copy(src, "count", mCount);
+ copy(src, "type", mType);
+ copy(src, "normalized", mNormalized);
+ copy(src, "max", mMax);
+ copy(src, "min", mMin);
+ }
+ return *this;
+}
+
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