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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2011-2022 Blender Foundation */
#include "scene/image_vdb.h"
#include "util/log.h"
#include "util/openvdb.h"
#ifdef WITH_OPENVDB
# include <openvdb/tools/Dense.h>
#endif
#ifdef WITH_NANOVDB
# include <nanovdb/util/OpenToNanoVDB.h>
#endif
CCL_NAMESPACE_BEGIN
#ifdef WITH_OPENVDB
struct NumChannelsOp {
int num_channels = 0;
template<typename GridType, typename FloatGridType, typename FloatDataType, int channels>
bool operator()(const openvdb::GridBase::ConstPtr &)
{
num_channels = channels;
return true;
}
};
struct ToDenseOp {
openvdb::CoordBBox bbox;
void *pixels;
template<typename GridType, typename FloatGridType, typename FloatDataType, int channels>
bool operator()(const openvdb::GridBase::ConstPtr &grid)
{
openvdb::tools::Dense<FloatDataType, openvdb::tools::LayoutXYZ> dense(bbox,
(FloatDataType *)pixels);
openvdb::tools::copyToDense(*openvdb::gridConstPtrCast<GridType>(grid), dense);
return true;
}
};
# ifdef WITH_NANOVDB
struct ToNanoOp {
nanovdb::GridHandle<> nanogrid;
template<typename GridType, typename FloatGridType, typename FloatDataType, int channels>
bool operator()(const openvdb::GridBase::ConstPtr &grid)
{
if constexpr (!std::is_same_v<GridType, openvdb::MaskGrid>) {
try {
nanogrid = nanovdb::openToNanoVDB(
FloatGridType(*openvdb::gridConstPtrCast<GridType>(grid)));
}
catch (const std::exception &e) {
VLOG(1) << "Error converting OpenVDB to NanoVDB grid: " << e.what();
}
return true;
}
else {
return false;
}
}
};
# endif
#endif
VDBImageLoader::VDBImageLoader(const string &grid_name) : grid_name(grid_name)
{
}
VDBImageLoader::~VDBImageLoader()
{
}
bool VDBImageLoader::load_metadata(const ImageDeviceFeatures &features, ImageMetaData &metadata)
{
#ifdef WITH_OPENVDB
if (!grid) {
return false;
}
/* Get number of channels from type. */
NumChannelsOp op;
if (!openvdb::grid_type_operation(grid, op)) {
return false;
}
metadata.channels = op.num_channels;
/* Set data type. */
# ifdef WITH_NANOVDB
if (features.has_nanovdb) {
/* NanoVDB expects no inactive leaf nodes. */
/*openvdb::FloatGrid &pruned_grid = *openvdb::gridPtrCast<openvdb::FloatGrid>(grid);
openvdb::tools::pruneInactive(pruned_grid.tree());
nanogrid = nanovdb::openToNanoVDB(pruned_grid);*/
ToNanoOp op;
if (!openvdb::grid_type_operation(grid, op)) {
return false;
}
nanogrid = std::move(op.nanogrid);
}
# endif
/* Set dimensions. */
bbox = grid->evalActiveVoxelBoundingBox();
if (bbox.empty()) {
return false;
}
openvdb::Coord dim = bbox.dim();
metadata.width = dim.x();
metadata.height = dim.y();
metadata.depth = dim.z();
# ifdef WITH_NANOVDB
if (nanogrid) {
metadata.byte_size = nanogrid.size();
if (metadata.channels == 1) {
metadata.type = IMAGE_DATA_TYPE_NANOVDB_FLOAT;
}
else {
metadata.type = IMAGE_DATA_TYPE_NANOVDB_FLOAT3;
}
}
else
# endif
{
if (metadata.channels == 1) {
metadata.type = IMAGE_DATA_TYPE_FLOAT;
}
else {
metadata.type = IMAGE_DATA_TYPE_FLOAT4;
}
}
/* Set transform from object space to voxel index. */
openvdb::math::Mat4f grid_matrix = grid->transform().baseMap()->getAffineMap()->getMat4();
Transform index_to_object;
for (int col = 0; col < 4; col++) {
for (int row = 0; row < 3; row++) {
index_to_object[row][col] = (float)grid_matrix[col][row];
}
}
Transform texture_to_index;
# ifdef WITH_NANOVDB
if (nanogrid) {
texture_to_index = transform_identity();
}
else
# endif
{
openvdb::Coord min = bbox.min();
texture_to_index = transform_translate(min.x(), min.y(), min.z()) *
transform_scale(dim.x(), dim.y(), dim.z());
}
metadata.transform_3d = transform_inverse(index_to_object * texture_to_index);
metadata.use_transform_3d = true;
# ifndef WITH_NANOVDB
(void)features;
# endif
return true;
#else
(void)metadata;
(void)features;
return false;
#endif
}
bool VDBImageLoader::load_pixels(const ImageMetaData &, void *pixels, const size_t, const bool)
{
#ifdef WITH_OPENVDB
# ifdef WITH_NANOVDB
if (nanogrid) {
memcpy(pixels, nanogrid.data(), nanogrid.size());
}
else
# endif
{
ToDenseOp op;
op.pixels = pixels;
op.bbox = bbox;
openvdb::grid_type_operation(grid, op);
}
return true;
#else
(void)pixels;
return false;
#endif
}
string VDBImageLoader::name() const
{
return grid_name;
}
bool VDBImageLoader::equals(const ImageLoader &other) const
{
#ifdef WITH_OPENVDB
const VDBImageLoader &other_loader = (const VDBImageLoader &)other;
return grid == other_loader.grid;
#else
(void)other;
return true;
#endif
}
void VDBImageLoader::cleanup()
{
#ifdef WITH_OPENVDB
/* Free OpenVDB grid memory as soon as we can. */
grid.reset();
#endif
#ifdef WITH_NANOVDB
nanogrid.reset();
#endif
}
bool VDBImageLoader::is_vdb_loader() const
{
return true;
}
#ifdef WITH_OPENVDB
openvdb::GridBase::ConstPtr VDBImageLoader::get_grid()
{
return grid;
}
#endif
CCL_NAMESPACE_END
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