Add BoolCodec, Codec Registry and Archive integration

Signed-off-by: Dan Bailey <danbailey@ilm.com>

Author: danrbailey

openvdb/openvdb/CMakeLists.txt

@@ -329,6 +329,7 @@ configure_file(version.h.in openvdb/version.h)
 set(OPENVDB_LIBRARY_SOURCE_FILES
   Grid.cc
   io/Archive.cc
+  io/Codec.cc
   io/Compression.cc
   io/File.cc
   io/GridDescriptor.cc
@@ -364,6 +365,11 @@ set(OPENVDB_LIBRARY_INCLUDE_FILES
   TypeList.h
 )
 
+set(OPENVDB_LIBRARY_CODECS_INCLUDE_FILES
+  codecs/BoolCodec.h
+  codecs/TopologyCodec.h
+)
+
 set(OPENVDB_LIBRARY_IO_INCLUDE_FILES
   io/Archive.h
   io/Codec.h
@@ -559,6 +565,7 @@ if(USE_EXPLICIT_INSTANTIATION)
   # inexpensive to generate in this case.
   set(OPENVDB_LIBRARY_INSTANTIATION_HEADERS
     ${OPENVDB_LIBRARY_TOOLS_INCLUDE_FILES}
+    ${OPENVDB_LIBRARY_CODECS_INCLUDE_FILES}
   )
 
   # A new source file is generated by CMake for every header

openvdb/openvdb/codecs/BoolCodec.h

@@ -0,0 +1,154 @@
+// Copyright Contributors to the OpenVDB Project
+// SPDX-License-Identifier: Apache-2.0
+
+#ifndef OPENVDB_IO_CODECS_BOOLCODEC_HAS_BEEN_INCLUDED
+#define OPENVDB_IO_CODECS_BOOLCODEC_HAS_BEEN_INCLUDED
+
+#include <openvdb/io/Codec.h>
+
+#include <openvdb/openvdb.h>
+
+#include "TopologyCodec.h"
+
+namespace openvdb {
+OPENVDB_USE_VERSION_NAMESPACE
+namespace OPENVDB_VERSION_NAME {
+namespace codecs {
+namespace internal {
+
+template <typename GridT>
+struct ReadBoolBuffersOp
+{
+    using TreeT = typename GridT::TreeType;
+    using RootT = typename TreeT::RootNodeType;
+    using LeafT = typename TreeT::LeafNodeType;
+    using ValueT = typename TreeT::ValueType;
+
+    ReadBoolBuffersOp(std::istream& _is, bool _saveFloatAsHalf,
+        const ValueT& _background, const CoordBBox* _clipBBox)
+        : is(_is)
+        , saveFloatAsHalf(_saveFloatAsHalf)
+        , background(_background)
+        , clipBBox(_clipBBox) { }
+
+    void operator()(RootT& root, size_t)
+    {
+        // Clip root-level tiles and prune children that were clipped.
+        if (clipBBox) {
+            root.clip(*clipBBox);
+        }
+    }
+
+    template <typename NodeT>
+    void operator()(NodeT& node, size_t)
+    {
+        // Clip internal node tiles and prune children that were clipped.
+        if (clipBBox) {
+            node.clip(*clipBBox, background);
+        }
+    }
+
+    void operator()(LeafT& leaf, size_t)
+    {
+        // Read in the value mask.
+        leaf.getValueMask().load(is);
+        // Read in the origin.
+        Coord origin;
+        is.read(reinterpret_cast<char*>(&origin), sizeof(Coord::ValueType) * 3);
+        leaf.setOrigin(origin);
+
+        // Read in the mask for the voxel values.
+        typename LeafT::Buffer::NodeMaskType nodeMask;
+        nodeMask.load(is);
+        typename LeafT::Buffer temp(nodeMask);
+        leaf.swap(temp);
+    }
+
+    std::istream& is;
+    const bool saveFloatAsHalf;
+    const ValueT& background;
+    const CoordBBox* clipBBox = nullptr;
+}; // struct ReadBoolBuffersOp
+
+template <typename GridT>
+struct WriteBoolBuffersOp
+{
+    using TreeT = typename GridT::TreeType;
+    using LeafT = typename TreeT::LeafNodeType;
+
+    WriteBoolBuffersOp(std::ostream& _os, bool _saveFloatAsHalf)
+        : os(_os)
+        , saveFloatAsHalf(_saveFloatAsHalf) { }
+
+    template <typename NodeT>
+    void operator()(const NodeT&, size_t) { }
+
+    void operator()(const LeafT& leaf, size_t)
+    {
+        // Write out the value mask.
+        leaf.getValueMask().save(os);
+
+        // Write out the origin.
+        os.write(reinterpret_cast<const char*>(&leaf.origin()), sizeof(Coord::ValueType) * 3);
+
+        // Write out the voxel values.
+        leaf.buffer().storage().save(os);
+    }
+
+    std::ostream& os;
+    const bool saveFloatAsHalf;
+}; // struct WriteBoolBuffersOp
+
+} // namespace internal
+
+template <typename GridT>
+struct OPENVDB_API BoolCodec : public TopologyCodec<GridT>
+{
+    using Ptr = std::unique_ptr<BoolCodec<GridT>>;
+
+    ~BoolCodec() noexcept = default;
+
+    static inline std::string name() { return GridT::gridType(); }
+
+    void readBuffers(std::istream& is, io::CodecData& data, const io::ReadOptions& options) final
+    {
+        GridT& grid = static_cast<GridT&>(*data.grid);
+
+        if (grid.hasMultiPassIO()) {
+            OPENVDB_THROW(IoError, "Multi-pass IO is not supported in BoolCodec");
+        }
+
+        io::checkFormatVersion(is);
+
+        bool saveFloatAsHalf = grid.saveFloatAsHalf();
+
+        auto& tree = grid.tree();
+        tree.clearAllAccessors();
+
+        std::unique_ptr<CoordBBox> clipIndexBBox;
+        if (options.clipBBox.isSorted()) {
+            clipIndexBBox = std::make_unique<CoordBBox>(grid.constTransform().worldToIndexNodeCentered(options.clipBBox));
+        }
+
+        internal::ReadBoolBuffersOp<GridT> readBuffersOp(is, saveFloatAsHalf, tree.background(), clipIndexBBox.get());
+        tools::visitNodesDepthFirst(grid.tree(), readBuffersOp, /*idx=*/0, /*topDown=*/false);
+    }
+
+    void writeBuffers(std::ostream& os, const GridBase& gridBase, const io::WriteOptions&) final
+    {
+        const GridT& grid = static_cast<const GridT&>(gridBase);
+
+        if (grid.hasMultiPassIO()) {
+            OPENVDB_THROW(IoError, "Multi-pass IO is not supported in BoolCodec");
+        }
+
+        internal::WriteBoolBuffersOp<GridT> writeBuffersOp(os, grid.saveFloatAsHalf());
+        tools::visitNodesDepthFirst(grid.tree(), writeBuffersOp);
+    }
+}; // struct BoolCodec
+
+} // namespace codecs
+} // namespace OPENVDB_VERSION_NAME
+} // namespace openvdb
+
+#endif // OPENVDB_IO_CODECS_BOOLCODEC_HAS_BEEN_INCLUDED