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GridHandle.h
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// Copyright Contributors to the OpenVDB Project
// SPDX-License-Identifier: MPL-2.0
/*!
\file GridHandle.h
\author Ken Museth
\date January 8, 2020
\brief Defines GridHandle, which manages a host, and possibly a device,
memory buffer containing one or more NanoVDB grids.
*/
#ifndef NANOVDB_GRID_HANDLE_H_HAS_BEEN_INCLUDED
#define NANOVDB_GRID_HANDLE_H_HAS_BEEN_INCLUDED
#include <fstream> // for std::ifstream
#include <iostream> // for std::cerr/cout
#include <vector>
#include <initializer_list>
#include <nanovdb/NanoVDB.h>// for mapToGridType
#include <nanovdb/util/HostBuffer.h>
#include <nanovdb/util/GridChecksum.h>// for updateGridCount
namespace nanovdb {
// --------------------------> GridHandle <------------------------------------
struct GridHandleMetaData {uint64_t offset, size; GridType gridType;};
/// @brief This class serves to manage a buffer containing one or more NanoVDB Grids.
///
/// @note It is important to note that this class does NOT depend on OpenVDB.
template<typename BufferT = HostBuffer>
class GridHandle
{
std::vector<GridHandleMetaData> mMetaData;
BufferT mBuffer;
template <typename T>
static T* no_const(const T* ptr) { return const_cast<T*>(ptr); }
public:
using BufferType = BufferT;
/// @brief Move constructor from a host buffer
/// @param buffer buffer containing one or more NanoGrids that will be moved into this GridHandle
/// @throw Will throw and error with the buffer does not contain a valid NanoGrid!
template<typename T = BufferT, typename enable_if<BufferTraits<T>::hasDeviceDual, int>::type = 0>
GridHandle(T&& buffer);
/// @brief Move constructor from a dual host-device buffer
/// @param buffer buffer containing one or more NanoGrids that will be moved into this GridHandle
/// @throw Will throw and error with the buffer does not contain a valid NanoGrid!
template<typename T = BufferT, typename disable_if<BufferTraits<T>::hasDeviceDual, int>::type = 0>
GridHandle(T&& buffer);
/// @brief Constructs an empty GridHandle
GridHandle() = default;
/// @brief Disallow copy-construction
GridHandle(const GridHandle&) = delete;
/// @brief Move copy-constructor
GridHandle(GridHandle&& other) noexcept {
mBuffer = std::move(other.mBuffer);
mMetaData = std::move(other.mMetaData);
}
/// @brief clear this GridHandle to an empty handle
void reset() {
mBuffer.clear();
mMetaData.clear();
}
/// @brief Disallow copy assignment operation
GridHandle& operator=(const GridHandle&) = delete;
/// @brief Move copy assignment operation
GridHandle& operator=(GridHandle&& other) noexcept {
mBuffer = std::move(other.mBuffer);
mMetaData = std::move(other.mMetaData);
return *this;
}
/// @brief Performs a deep copy of the GridHandle, possibly templated on a different buffer type
/// @tparam OtherBufferT Buffer type of the deep copy
/// @param buffer optional buffer used for allocation
/// @return A new handle of the specified buffer type that contains a deep copy of the current handle
template <typename OtherBufferT = HostBuffer>
GridHandle<OtherBufferT> copy(const OtherBufferT& buffer = OtherBufferT()) const;
/// @brief Return a reference to the buffer
BufferT& buffer() { return mBuffer; }
/// @brief Return a const reference to the buffer
const BufferT& buffer() const { return mBuffer; }
/// @brief Returns a non-const pointer to the data.
/// @warning Note that the return pointer can be NULL if the GridHandle was not initialized
uint8_t* data() { return mBuffer.data(); }
/// @brief Returns a const pointer to the data.
/// @warning Note that the return pointer can be NULL if the GridHandle was not initialized
const uint8_t* data() const { return mBuffer.data(); }
template<typename U = BufferT>
typename enable_if<BufferTraits<U>::hasDeviceDual, const uint8_t*>::type
deviceData() const { return mBuffer.deviceData(); }
template<typename U = BufferT>
typename enable_if<BufferTraits<U>::hasDeviceDual, uint8_t*>::type
deviceData() { return mBuffer.deviceData(); }
/// @brief Returns the size in bytes of the raw memory buffer managed by this GridHandle.
uint64_t size() const { return mBuffer.size(); }
//@{
/// @brief Return true if this handle is empty, i.e. has no allocated memory
bool empty() const { return this->size() == 0; }
bool isEmpty() const { return this->size() == 0; }
//@}
/// @brief Return true if this handle contains any grids
operator bool() const { return !this->empty(); }
/// @brief Returns a const host pointer to the @a n'th NanoVDB grid encoded in this GridHandle.
/// @tparam ValueT Value type of the grid point to be returned
/// @param n Index of the (host) grid pointer to be returned
/// @warning Note that the return pointer can be NULL if the GridHandle no host grid, @a n is invalid
/// or if the template parameter does not match the specified grid!
template<typename ValueT>
const NanoGrid<ValueT>* grid(uint32_t n = 0) const;
/// @brief Returns a host pointer to the @a n'th NanoVDB grid encoded in this GridHandle.
/// @tparam ValueT Value type of the grid point to be returned
/// @param n Index of the (host) grid pointer to be returned
/// @warning Note that the return pointer can be NULL if the GridHandle no host grid, @a n is invalid
/// or if the template parameter does not match the specified grid!
template<typename ValueT>
NanoGrid<ValueT>* grid(uint32_t n = 0) {return const_cast<NanoGrid<ValueT>*>(static_cast<const GridHandle*>(this)->template grid<ValueT>(n));}
/// @brief Return a const pointer to the @a n'th grid encoded in this GridHandle on the device, e.g. GPU
/// @tparam ValueT Value type of the grid point to be returned
/// @param n Index of the (device) grid pointer to be returned
/// @warning Note that the return pointer can be NULL if the GridHandle has no device grid, @a n is invalid,
/// or if the template parameter does not match the specified grid.
template<typename ValueT, typename U = BufferT>
typename enable_if<BufferTraits<U>::hasDeviceDual, const NanoGrid<ValueT>*>::type
deviceGrid(uint32_t n=0) const;
/// @brief Return a const pointer to the @a n'th grid encoded in this GridHandle on the device, e.g. GPU
/// @tparam ValueT Value type of the grid point to be returned
/// @param n Index if of the grid pointer to be returned
/// @param verbose if non-zero error messages will be printed in case something failed
/// @warning Note that the return pointer can be NULL if the GridHandle was not initialized, @a n is invalid,
/// or if the template parameter does not match the specified grid.
template<typename ValueT, typename U = BufferT>
typename enable_if<BufferTraits<U>::hasDeviceDual, NanoGrid<ValueT>*>::type
deviceGrid(uint32_t n=0){return const_cast<NanoGrid<ValueT>*>(static_cast<const GridHandle*>(this)->template deviceGrid<ValueT>(n));}
/// @brief Upload the grid to the device, e.g. from CPU to GPU
/// @note This method is only available if the buffer supports devices
template<typename U = BufferT>
typename enable_if<BufferTraits<U>::hasDeviceDual, void>::type
deviceUpload(void* stream = nullptr, bool sync = true) { mBuffer.deviceUpload(stream, sync); }
/// @brief Download the grid to from the device, e.g. from GPU to CPU
/// @note This method is only available if the buffer supports devices
template<typename U = BufferT>
typename enable_if<BufferTraits<U>::hasDeviceDual, void>::type
deviceDownload(void* stream = nullptr, bool sync = true) { mBuffer.deviceDownload(stream, sync); }
/// @brief Check if the buffer is this handle has any padding, i.e. if the buffer is larger than the combined size of all its grids
/// @return true is the combined size of all grid is smaller than the buffer size
bool isPadded() const {return mMetaData.empty() ? false : mMetaData.back().offset + mMetaData.back().size != mBuffer.size();}
/// @brief Return the total number of grids contained in this buffer
uint32_t gridCount() const {return static_cast<uint32_t>(mMetaData.size());}
/// @brief Return the grid size of the @a n'th grid in this GridHandle
/// @param n index of the grid (assumed to be less than gridCount())
/// @return Return the byte size of the specified grid
uint64_t gridSize(uint32_t n = 0) const {return mMetaData[n].size; }
/// @brief Return the GridType of the @a n'th grid in this GridHandle
/// @param n index of the grid (assumed to be less than gridCount())
/// @return Return the GridType of the specified grid
GridType gridType(uint32_t n = 0) const {return mMetaData[n].gridType; }
/// @brief Access to the GridData of the n'th grid in the current handle
/// @param n zero-based ID of the grid
/// @return Const pointer to the n'th GridData in the current handle
const GridData* gridData(uint32_t n = 0) const;
/// @brief Returns a const point to the @a n'th grid meta data
/// @param n zero-based ID of the grid
/// @warning Note that the return pointer can be NULL if the GridHandle was not initialized
const GridMetaData* gridMetaData(uint32_t n = 0) const;
/// @brief Write a specific grid in this buffer to an output stream
/// @param os output stream that the buffer will be written to
/// @param n zero-based index of the grid to be written to stream
void write(std::ostream& os, uint32_t n) const {
if (const GridData* data = this->gridData(n)) {
os.write((const char*)data, data->mGridSize);
} else {
throw std::runtime_error("GridHandle does not contain a #" + std::to_string(n) + " grid");
}
}
/// @brief Write the entire grid buffer to an output stream
/// @param os output stream that the buffer will be written to
void write(std::ostream& os) const {
for (uint32_t n=0; n<this->gridCount(); ++n) this->write(os, n);
}
/// @brief Write this entire grid buffer to a file
/// @param fileName string name of the output file
void write(const std::string &fileName) const {
std::ofstream os(fileName, std::ios::out | std::ios::binary | std::ios::trunc);
if (!os.is_open()) throw std::ios_base::failure("Unable to open file named \"" + fileName + "\" for output");
this->write(os);
}
/// @brief Write a specific grid to file
/// @param fileName string name of the output file
/// @param n zero-based index of the grid to be written to file
void write(const std::string &fileName, uint32_t n) const {
std::ofstream os(fileName, std::ios::out | std::ios::binary | std::ios::trunc);
if (!os.is_open()) throw std::ios_base::failure("Unable to open file named \"" + fileName + "\" for output");
this->write(os, n);
}
/// @brief Read an entire raw grid buffer from an input stream
/// @param is input stream containing a raw grid buffer
/// @param pool optional pool from which to allocate the new grid buffer
/// @throw Will throw a std::logic_error if the stream does not contain a valid raw grid
void read(std::istream& is, const BufferT& pool = BufferT());
/// @brief Read a specific grid from an input stream containing a raw grid buffer
/// @param is input stream containing a raw grid buffer
/// @param n zero-based index of the grid to be read
/// @param pool optional pool from which to allocate the new grid buffer
/// @throw Will throw a std::logic_error if the stream does not contain a valid raw grid
void read(std::istream& is, uint32_t n, const BufferT& pool = BufferT());
/// @brief Read a specific grid from an input stream containing a raw grid buffer
/// @param is input stream containing a raw grid buffer
/// @param gridName string name of the grid to be read
/// @param pool optional pool from which to allocate the new grid buffer
/// @throw Will throw a std::logic_error if the stream does not contain a valid raw grid with the speficied name
void read(std::istream& is, const std::string &gridName, const BufferT& pool = BufferT());
/// @brief Read a raw grid buffer from a file
/// @param filename string name of the input file containing a raw grid buffer
/// @param pool optional pool from which to allocate the new grid buffe
void read(const std::string &fileName, const BufferT& pool = BufferT()) {
std::ifstream is(fileName, std::ios::in | std::ios::binary);
if (!is.is_open()) throw std::ios_base::failure("Unable to open file named \"" + fileName + "\" for input");
this->read(is, pool);
}
/// @brief Read a specific grid from a file containing a raw grid buffer
/// @param filename string name of the input file containing a raw grid buffer
/// @param n zero-based index of the grid to be read
/// @param pool optional pool from which to allocate the new grid buffer
/// @throw Will throw a std::ios_base::failure if the file does not exist and a
/// std::logic_error if the files does not contain a valid raw grid
void read(const std::string &fileName, uint32_t n, const BufferT& pool = BufferT()) {
std::ifstream is(fileName, std::ios::in | std::ios::binary);
if (!is.is_open()) throw std::ios_base::failure("Unable to open file named \"" + fileName + "\" for input");
this->read(is, n, pool);
}
/// @brief Read a specific grid from a file containing a raw grid buffer
/// @param filename string name of the input file containing a raw grid buffer
/// @param gridName string name of the grid to be read
/// @param pool optional pool from which to allocate the new grid buffer
/// @throw Will throw a std::ios_base::failure if the file does not exist and a
/// std::logic_error if the files does not contain a valid raw grid withe the specified name
void read(const std::string &fileName, const std::string &gridName, const BufferT& pool = BufferT()) {
std::ifstream is(fileName, std::ios::in | std::ios::binary);
if (!is.is_open()) throw std::ios_base::failure("Unable to open file named \"" + fileName + "\" for input");
this->read(is, gridName, pool);
}
}; // GridHandle
// --------------------------> Implementation of private methods in GridHandle <------------------------------------
template<typename BufferT>
inline const GridData* GridHandle<BufferT>::gridData(uint32_t n) const
{
const uint8_t *data = this->data();
if (data == nullptr || n >= mMetaData.size()) return nullptr;
return reinterpret_cast<const GridData*>(data + mMetaData[n].offset);
}// const GridData* GridHandle<BufferT>::gridData(uint32_t n) const
template<typename BufferT>
inline const GridMetaData* GridHandle<BufferT>::gridMetaData(uint32_t n) const
{
const uint8_t *data = this->data();
if (data == nullptr || n >= mMetaData.size()) return nullptr;
return reinterpret_cast<const GridMetaData*>(data + mMetaData[n].offset);
}// const GridMetaData* GridHandle<BufferT>::gridMetaData(uint32_t n) const
namespace {// anonymous namespace
inline __hostdev__ void cpyMetaData(const GridData *data, GridHandleMetaData *meta)
{
uint64_t offset = 0;
for (auto *p=meta, *q=p+data->mGridCount; p!=q; ++p) {
*p = {offset, data->mGridSize, data->mGridType};
offset += p->size;
data = PtrAdd<const GridData>(data, p->size);
}
}// void cpyMetaData(const GridData *data, GridHandleMetaData *meta)
}// anonymous namespace
template<typename BufferT>
template<typename T, typename disable_if<BufferTraits<T>::hasDeviceDual, int>::type>
GridHandle<BufferT>::GridHandle(T&& buffer)
{
static_assert(is_same<T,BufferT>::value, "Expected U==BufferT");
mBuffer = std::move(buffer);
if (auto *data = reinterpret_cast<const GridData*>(mBuffer.data())) {
if (!data->isValid()) throw std::runtime_error("GridHandle was constructed with an invalid host buffer");
mMetaData.resize(data->mGridCount);
cpyMetaData(data, mMetaData.data());
}
}// GridHandle<BufferT>::GridHandle(T&& buffer)
template<typename BufferT>
template <typename OtherBufferT>
inline GridHandle<OtherBufferT> GridHandle<BufferT>::copy(const OtherBufferT& other) const
{
if (mBuffer.isEmpty()) return GridHandle<OtherBufferT>();// return an empty handle
auto buffer = OtherBufferT::create(mBuffer.size(), &other);
std::memcpy(buffer.data(), mBuffer.data(), mBuffer.size());// deep copy of buffer
return GridHandle<OtherBufferT>(std::move(buffer));
}// GridHandle<OtherBufferT> GridHandle<BufferT>::copy(const OtherBufferT& other) const
template<typename BufferT>
template<typename ValueT>
inline const NanoGrid<ValueT>* GridHandle<BufferT>::grid(uint32_t n) const
{
const uint8_t *data = mBuffer.data();
if (data == nullptr || n >= mMetaData.size() || mMetaData[n].gridType != mapToGridType<ValueT>()) return nullptr;
return reinterpret_cast<const NanoGrid<ValueT>*>(data + mMetaData[n].offset);
}// const NanoGrid<ValueT>* GridHandle<BufferT>::grid(uint32_t n) const
template<typename BufferT>
template<typename ValueT, typename U>
inline typename enable_if<BufferTraits<U>::hasDeviceDual, const NanoGrid<ValueT>*>::type
GridHandle<BufferT>::deviceGrid(uint32_t n) const
{
const uint8_t *data = mBuffer.deviceData();
if (data == nullptr || n >= mMetaData.size() || mMetaData[n].gridType != mapToGridType<ValueT>()) return nullptr;
return reinterpret_cast<const NanoGrid<ValueT>*>(data + mMetaData[n].offset);
}// GridHandle<BufferT>::deviceGrid(uint32_t n) cons
template<typename BufferT>
void GridHandle<BufferT>::read(std::istream& is, const BufferT& pool)
{
GridData data;
is.read((char*)&data, 40);// only 40 bytes are required for all the data we need in GridData
if (data.isValid()) {
uint64_t size = data.mGridSize, sum = 0u;
while(data.mGridIndex + 1u < data.mGridCount) {// loop over remaining raw grids in stream
is.seekg(data.mGridSize - 40, std::ios::cur);// skip grid
is.read((char*)&data, 40);// read 40 bytes of the next GridData
sum += data.mGridSize;
}
is.seekg(-int64_t(sum + 40), std::ios::cur);// rewind to start
auto buffer = BufferT::create(size + sum, &pool);
is.read((char*)(buffer.data()), buffer.size());
*this = GridHandle(std::move(buffer));
} else {
is.seekg(-40, std::ios::cur);// rewind
throw std::logic_error("This stream does not contain a valid raw grid buffer");
}
}// void GridHandle<BufferT>::read(std::istream& is, const BufferT& pool)
template<typename BufferT>
void GridHandle<BufferT>::read(std::istream& is, uint32_t n, const BufferT& pool)
{
GridData data;
is.read((char*)&data, 40);// only 40 bytes are required for all the data we need in GridData
if (data.isValid()) {
if (n>=data.mGridCount) throw std::runtime_error("stream does not contain a #" + std::to_string(n) + " grid");
while(data.mGridIndex != n) {
is.seekg(data.mGridSize - 40, std::ios::cur);// skip grid
is.read((char*)&data, 40);// read 40 bytes
}
auto buffer = BufferT::create(data.mGridSize, &pool);
is.seekg(-40, std::ios::cur);// rewind
is.read((char*)(buffer.data()), data.mGridSize);
updateGridCount((GridData*)buffer.data(), 0u, 1u);
*this = GridHandle(std::move(buffer));
} else {
is.seekg(-40, std::ios::cur);// rewind 40 bytes to undo initial read
throw std::logic_error("This file does not contain a valid raw buffer");
}
}// void GridHandle<BufferT>::read(std::istream& is, uint32_t n, const BufferT& pool)
template<typename BufferT>
void GridHandle<BufferT>::read(std::istream& is, const std::string &gridName, const BufferT& pool)
{
static const std::streamsize byteSize = sizeof(GridData);
GridData data;
is.read((char*)&data, byteSize);
is.seekg(-byteSize, std::ios::cur);// rewind
if (data.isValid()) {
uint32_t n = 0;
while(data.mGridName != gridName && n++ < data.mGridCount) {
is.seekg(data.mGridSize, std::ios::cur);// skip grid
is.read((char*)&data, byteSize);// read 40 bytes
is.seekg(-byteSize, std::ios::cur);// rewind
}
if (n>data.mGridCount) throw std::runtime_error("No raw grid named \""+gridName+"\"");
auto buffer = BufferT::create(data.mGridSize, &pool);
is.read((char*)(buffer.data()), data.mGridSize);
updateGridCount((GridData*)buffer.data(), 0u, 1u);
*this = GridHandle(std::move(buffer));
} else {
throw std::logic_error("This file does not contain a valid raw buffer");
}
}// void GridHandle<BufferT>::read(std::istream& is, const std::string &gridName n, const BufferT& pool)
// --------------------------> free-standing functions <------------------------------------
/// @brief Split all grids in a single GridHandle into a vector of multiple GridHandles each with a single grid
/// @tparam BufferT Type of the input and output grid buffers
/// @param handle GridHandle with grids that will be slip into individual GridHandles
/// @param pool optional pool used for allocation of output GridHandle
/// @return Vector of GridHandles each containing a single grid
template<typename BufferT, template <class, class...> class VectorT = std::vector>
inline VectorT<GridHandle<BufferT>>
splitGrids(const GridHandle<BufferT> &handle, const BufferT* other = nullptr)
{
using HandleT = GridHandle<BufferT>;
const uint8_t *ptr = handle.data();
if (ptr == nullptr) return VectorT<HandleT>();
VectorT<HandleT> handles(handle.gridCount());
for (auto &h : handles) {
const GridData *src = reinterpret_cast<const GridData*>(ptr);
NANOVDB_ASSERT(src->isValid());
auto buffer = BufferT::create(src->mGridSize, other);
GridData *dst = reinterpret_cast<GridData*>(buffer.data());
std::memcpy(dst, src, src->mGridSize);
updateGridCount(dst, 0u, 1u);
h = HandleT(std::move(buffer));
ptr += src->mGridSize;
}
return std::move(handles);
}// splitGrids
/// @brief Combines (or merges) multiple GridHandles into a single GridHandle containing all grids
/// @tparam BufferT Type of the input and output grid buffers
/// @param handles Vector of GridHandles to be combined
/// @param pool optional pool used for allocation of output GridHandle
/// @return single GridHandle containing all input grids
template<typename BufferT, template <class, class...> class VectorT>
inline GridHandle<BufferT>
mergeGrids(const VectorT<GridHandle<BufferT>> &handles, const BufferT* pool = nullptr)
{
uint64_t size = 0u;
uint32_t counter = 0u, gridCount = 0u;
for (auto &h : handles) {
gridCount += h.gridCount();
for (uint32_t n=0; n<h.gridCount(); ++n) size += h.gridSize(n);
}
auto buffer = BufferT::create(size, pool);
uint8_t *dst = buffer.data();
for (auto &h : handles) {
const uint8_t *src = h.data();
for (uint32_t n=0; n<h.gridCount(); ++n) {
std::memcpy(dst, src, h.gridSize(n));
GridData *data = reinterpret_cast<GridData*>(dst);
NANOVDB_ASSERT(data->isValid());
updateGridCount(data, counter++, gridCount);
dst += data->mGridSize;
src += data->mGridSize;
}
}
return GridHandle<BufferT>(std::move(buffer));
}// mergeGrids
} // namespace nanovdb
#if defined(__CUDACC__)
#include <nanovdb/util/cuda/CudaGridHandle.cuh>
#endif// defined(__CUDACC__)
#endif // NANOVDB_GRID_HANDLE_H_HAS_BEEN_INCLUDED
GridChecksum.h
Computes a pair of 32bit checksums, of a Grid, by means of Cyclic Redundancy Check (CRC)
HostBuffer.h
HostBuffer - a buffer that contains a shared or private bump pool to either externally or internally ...
NanoVDB.h
Implements a light-weight self-contained VDB data-structure in a single file! In other words,...
__hostdev__
#define __hostdev__
Definition NanoVDB.h:213
NANOVDB_ASSERT
#define NANOVDB_ASSERT(x)
Definition NanoVDB.h:190
nanovdb::GridHandle
This class serves to manage a buffer containing one or more NanoVDB Grids.
Definition GridHandle.h:38
nanovdb::GridHandle::operator=
GridHandle & operator=(const GridHandle &)=delete
Disallow copy assignment operation.
nanovdb::GridHandle::grid
NanoGrid< ValueT > * grid(uint32_t n=0)
Returns a host pointer to the n'th NanoVDB grid encoded in this GridHandle.
Definition GridHandle.h:142
nanovdb::GridHandle::data
const uint8_t * data() const
Returns a const pointer to the data.
Definition GridHandle.h:107
nanovdb::GridHandle::buffer
BufferT & buffer()
Return a reference to the buffer.
Definition GridHandle.h:96
nanovdb::GridHandle::gridData
const GridData * gridData(uint32_t n=0) const
Access to the GridData of the n'th grid in the current handle.
Definition GridHandle.h:293
nanovdb::GridHandle::write
void write(std::ostream &os) const
Write the entire grid buffer to an output stream.
Definition GridHandle.h:215
nanovdb::GridHandle::GridHandle
GridHandle(const GridHandle &)=delete
Disallow copy-construction.
nanovdb::GridHandle::operator=
GridHandle & operator=(GridHandle &&other) noexcept
Move copy assignment operation.
Definition GridHandle.h:82
nanovdb::GridHandle::grid
const NanoGrid< ValueT > * grid(uint32_t n=0) const
Returns a const host pointer to the n'th NanoVDB grid encoded in this GridHandle.
Definition GridHandle.h:345
nanovdb::GridHandle::read
void read(const std::string &fileName, const std::string &gridName, const BufferT &pool=BufferT())
Read a specific grid from a file containing a raw grid buffer.
Definition GridHandle.h:283
nanovdb::GridHandle::deviceData
enable_if< BufferTraits< U >::hasDeviceDual, constuint8_t * >::type deviceData() const
Definition GridHandle.h:111
nanovdb::GridHandle::empty
bool empty() const
Return true if this handle is empty, i.e. has no allocated memory.
Definition GridHandle.h:121
nanovdb::GridHandle::size
uint64_t size() const
Returns the size in bytes of the raw memory buffer managed by this GridHandle.
Definition GridHandle.h:117
nanovdb::GridHandle::buffer
const BufferT & buffer() const
Return a const reference to the buffer.
Definition GridHandle.h:99
nanovdb::GridHandle::GridHandle
GridHandle(GridHandle &&other) noexcept
Move copy-constructor.
Definition GridHandle.h:67
nanovdb::GridHandle::gridMetaData
const GridMetaData * gridMetaData(uint32_t n=0) const
Returns a const point to the n'th grid meta data.
Definition GridHandle.h:301
nanovdb::GridHandle::gridSize
uint64_t gridSize(uint32_t n=0) const
Return the grid size of the n'th grid in this GridHandle.
Definition GridHandle.h:185
nanovdb::GridHandle::gridType
GridType gridType(uint32_t n=0) const
Return the GridType of the n'th grid in this GridHandle.
Definition GridHandle.h:190
nanovdb::GridHandle::deviceUpload
enable_if< BufferTraits< U >::hasDeviceDual, void >::type deviceUpload(void *stream=nullptr, bool sync=true)
Upload the grid to the device, e.g. from CPU to GPU.
Definition GridHandle.h:167
nanovdb::GridHandle::read
void read(const std::string &fileName, uint32_t n, const BufferT &pool=BufferT())
Read a specific grid from a file containing a raw grid buffer.
Definition GridHandle.h:271
nanovdb::GridHandle::write
void write(const std::string &fileName) const
Write this entire grid buffer to a file.
Definition GridHandle.h:221
nanovdb::GridHandle::data
uint8_t * data()
Returns a non-const pointer to the data.
Definition GridHandle.h:103
nanovdb::GridHandle::isPadded
bool isPadded() const
Check if the buffer is this handle has any padding, i.e. if the buffer is larger than the combined si...
Definition GridHandle.h:177
nanovdb::GridHandle::deviceGrid
enable_if< BufferTraits< U >::hasDeviceDual, NanoGrid< ValueT > * >::type deviceGrid(uint32_t n=0)
Return a const pointer to the n'th grid encoded in this GridHandle on the device, e....
Definition GridHandle.h:161
nanovdb::GridHandle::BufferType
BufferT BufferType
Definition GridHandle.h:46
nanovdb::GridHandle::deviceDownload
enable_if< BufferTraits< U >::hasDeviceDual, void >::type deviceDownload(void *stream=nullptr, bool sync=true)
Download the grid to from the device, e.g. from GPU to CPU.
Definition GridHandle.h:173
nanovdb::GridHandle::copy
GridHandle< OtherBufferT > copy(const OtherBufferT &buffer=OtherBufferT()) const
Performs a deep copy of the GridHandle, possibly templated on a different buffer type.
Definition GridHandle.h:335
nanovdb::GridHandle::deviceData
enable_if< BufferTraits< U >::hasDeviceDual, uint8_t * >::type deviceData()
Definition GridHandle.h:114
nanovdb::GridHandle::gridCount
uint32_t gridCount() const
Return the total number of grids contained in this buffer.
Definition GridHandle.h:180
nanovdb::GridHandle::isEmpty
bool isEmpty() const
Definition GridHandle.h:122
nanovdb::GridHandle::reset
void reset()
clear this GridHandle to an empty handle
Definition GridHandle.h:73
nanovdb::GridHandle::GridHandle
GridHandle(T &&buffer)
Move constructor from a host buffer.
Definition GridHandle.h:322
nanovdb::GridHandle::read
void read(const std::string &fileName, const BufferT &pool=BufferT())
Read a raw grid buffer from a file.
Definition GridHandle.h:259
nanovdb::GridHandle::write
void write(const std::string &fileName, uint32_t n) const
Write a specific grid to file.
Definition GridHandle.h:230
nanovdb::GridHandle::read
void read(std::istream &is, const BufferT &pool=BufferT())
Read an entire raw grid buffer from an input stream.
Definition GridHandle.h:363
nanovdb::GridHandle::write
void write(std::ostream &os, uint32_t n) const
Write a specific grid in this buffer to an output stream.
Definition GridHandle.h:205
nanovdb::GridHandle::deviceGrid
enable_if< BufferTraits< U >::hasDeviceDual, constNanoGrid< ValueT > * >::type deviceGrid(uint32_t n=0) const
Return a const pointer to the n'th grid encoded in this GridHandle on the device, e....
Definition GridHandle.h:355
nanovdb::GridHandle::GridHandle
GridHandle()=default
Constructs an empty GridHandle.
nanovdb::GridMetaData
This is a convenient class that allows for access to grid meta-data that are independent of the value...
Definition NanoVDB.h:7511
nanovdb
Definition NanoVDB.h:247
nanovdb::mergeGrids
GridHandle< BufferT > mergeGrids(const VectorT< GridHandle< BufferT > > &handles, const BufferT *pool=nullptr)
Combines (or merges) multiple GridHandles into a single GridHandle containing all grids.
Definition GridHandle.h:465
nanovdb::NanoGrid
Grid< NanoTree< BuildT > > NanoGrid
Definition NanoVDB.h:6449
nanovdb::updateGridCount
bool updateGridCount(GridData *data, uint32_t gridIndex, uint32_t gridCount)
Updates the ground index and count, as well as the partial checksum if needed.
Definition GridChecksum.h:447
nanovdb::splitGrids
VectorT< GridHandle< BufferT > > splitGrids(const GridHandle< BufferT > &handle, const BufferT *other=nullptr)
Split all grids in a single GridHandle into a vector of multiple GridHandles each with a single grid.
Definition GridHandle.h:439
nanovdb::PtrAdd
static DstT * PtrAdd(SrcT *p, int64_t offset)
Adds a byte offset of a non-const pointer to produce another non-const pointer.
Definition NanoVDB.h:795
nanovdb::GridType
GridType
List of types that are currently supported by NanoVDB.
Definition NanoVDB.h:317
nanovdb::mapToGridType
GridType mapToGridType()
Maps from a templated build type to a GridType enum.
Definition NanoVDB.h:2050
nanovdb::GridData
Struct with all the member data of the Grid (useful during serialization of an openvdb grid)
Definition NanoVDB.h:3512
nanovdb::GridData::mGridType
GridType mGridType
Definition NanoVDB.h:3526
nanovdb::GridData::isValid
bool isValid() const
return true if the magic number and the version are both valid
Definition NanoVDB.h:3568
nanovdb::GridData::mGridSize
uint64_t mGridSize
Definition NanoVDB.h:3520
nanovdb::GridData::mGridCount
uint32_t mGridCount
Definition NanoVDB.h:3519
nanovdb::GridHandleMetaData
Definition GridHandle.h:31
nanovdb::GridHandleMetaData::offset
uint64_t offset
Definition GridHandle.h:31
nanovdb::GridHandleMetaData::gridType
GridType gridType
Definition GridHandle.h:31
nanovdb::GridHandleMetaData::size
uint64_t size
Definition GridHandle.h:31
nanovdb::enable_if
C++11 implementation of std::enable_if.
Definition NanoVDB.h:493
nanovdb::is_same::value
static constexpr bool value
Definition NanoVDB.h:443