Add Chromium-only Blender WebEngine parity work

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

@@ -0,0 +1,47 @@
+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0 */
+
+#pragma once
+
+#ifdef WITH_OPENVDB
+#  include <openvdb/openvdb.h>
+
+namespace openvdb {
+
+using Vec4fTree = tree::Tree4<Vec4f, 5, 4, 3>::Type;
+using Vec4fGrid = Grid<Vec4fTree>;
+
+}  // namespace openvdb
+
+CCL_NAMESPACE_BEGIN
+
+/* Convert to the few grid types we can render natively. */
+openvdb::GridBase::ConstPtr openvdb_convert_to_known_type(const openvdb::GridBase::ConstPtr &grid);
+
+/* Apply operation to known grid types. */
+template<typename OpType>
+bool openvdb_grid_type_operation(const openvdb::GridBase::ConstPtr &grid, OpType &&op)
+{
+  if (grid->isType<openvdb::FloatGrid>()) {
+    return op.template operator()<openvdb::FloatGrid, float, 1>(
+        openvdb::gridConstPtrCast<openvdb::FloatGrid>(grid));
+  }
+  if (grid->isType<openvdb::Vec3fGrid>()) {
+    return op.template operator()<openvdb::Vec3fGrid, openvdb::Vec3f, 3>(
+        openvdb::gridConstPtrCast<openvdb::Vec3fGrid>(grid));
+  }
+  if (grid->isType<openvdb::Vec4fGrid>()) {
+    return op.template operator()<openvdb::Vec4fGrid, openvdb::Vec4f, 4>(
+        openvdb::gridConstPtrCast<openvdb::Vec4fGrid>(grid));
+  }
+  assert(0);
+  return false;
+}
+
+/* Count number of channels in known types. */
+int openvdb_num_channels(const openvdb::GridBase::ConstPtr &grid);
+
+CCL_NAMESPACE_END
+
+#endif