Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/cycles/util/nanovdb.h

@@ -0,0 +1,36 @@
+/* SPDX-FileCopyrightText: Contributors to the OpenVDB Project
+ * SPDX-FileCopyrightText: 2025 Blender Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0 */
+
+#pragma once
+
+#ifdef WITH_NANOVDB
+
+#  include <openvdb/openvdb.h>
+
+#  define NANOVDB_USE_OPENVDB
+#  define NANOVDB_USE_TBB
+
+#  include <nanovdb/NanoVDB.h>  // manages and streams the raw memory buffer of a NanoVDB grid.
+
+#  if NANOVDB_MAJOR_VERSION_NUMBER > 32 || \
+      (NANOVDB_MAJOR_VERSION_NUMBER == 32 && NANOVDB_MINOR_VERSION_NUMBER >= 7)
+#    include <nanovdb/GridHandle.h>
+#  else
+#    include <nanovdb/util/GridHandle.h>
+#  endif
+
+CCL_NAMESPACE_BEGIN
+
+/* Convert NanoVDB to OpenVDB mask grid that represents just the topology. */
+openvdb::MaskGrid::Ptr nanovdb_to_openvdb_mask(const nanovdb::GridHandle<> &handle);
+
+/* Convert OpenVDB to NanoVDB grid. */
+nanovdb::GridHandle<> openvdb_to_nanovdb(const openvdb::GridBase::ConstPtr &grid,
+                                         const int precision,
+                                         const float clipping);
+
+CCL_NAMESPACE_END
+
+#endif