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test/intern/cycles/render/image_vdb.cpp
Patrick Mours 3df90de6c2 Cycles: Add NanoVDB support for rendering volumes 
NanoVDB is a platform-independent sparse volume data structure that makes it possible to
use OpenVDB volumes on the GPU. This patch uses it for volume rendering in Cycles,
replacing the previous usage of dense 3D textures.

Since it has a big impact on memory usage and performance and changes the OpenVDB
branch used for the rest of Blender as well, this is not enabled by default yet, which will
happen only after 2.82 was branched off. To enable it, build both dependencies and Blender
itself with the "WITH_NANOVDB" CMake option.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D8794
2020-10-05 15:03:30 +02:00

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/*
* Copyright 2011-2020 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "render/image_vdb.h"
#ifdef WITH_OPENVDB
# include <openvdb/openvdb.h>
# include <openvdb/tools/Dense.h>
#endif
#ifdef WITH_NANOVDB
# include <nanovdb/util/OpenToNanoVDB.h>
#endif
CCL_NAMESPACE_BEGIN
VDBImageLoader::VDBImageLoader(const string &grid_name) : grid_name(grid_name)
{
}
VDBImageLoader::~VDBImageLoader()
{
}
bool VDBImageLoader::load_metadata(ImageMetaData &metadata)
{
#ifdef WITH_OPENVDB
if (!grid) {
return false;
}
bbox = grid->evalActiveVoxelBoundingBox();
if (bbox.empty()) {
return false;
}
/* Set dimensions. */
openvdb::Coord dim = bbox.dim();
openvdb::Coord min = bbox.min();
metadata.width = dim.x();
metadata.height = dim.y();
metadata.depth = dim.z();
/* Set data type. */
if (grid->isType<openvdb::FloatGrid>()) {
metadata.channels = 1;
# ifdef WITH_NANOVDB
nanogrid = nanovdb::openToNanoVDB(*openvdb::gridConstPtrCast<openvdb::FloatGrid>(grid));
# endif
}
else if (grid->isType<openvdb::Vec3fGrid>()) {
metadata.channels = 3;
# ifdef WITH_NANOVDB
nanogrid = nanovdb::openToNanoVDB(*openvdb::gridConstPtrCast<openvdb::Vec3fGrid>(grid));
# endif
}
else if (grid->isType<openvdb::BoolGrid>()) {
metadata.channels = 1;
# ifdef WITH_NANOVDB
nanogrid = nanovdb::openToNanoVDB(
openvdb::FloatGrid(*openvdb::gridConstPtrCast<openvdb::BoolGrid>(grid)));
# endif
}
else if (grid->isType<openvdb::DoubleGrid>()) {
metadata.channels = 1;
# ifdef WITH_NANOVDB
nanogrid = nanovdb::openToNanoVDB(
openvdb::FloatGrid(*openvdb::gridConstPtrCast<openvdb::DoubleGrid>(grid)));
# endif
}
else if (grid->isType<openvdb::Int32Grid>()) {
metadata.channels = 1;
# ifdef WITH_NANOVDB
nanogrid = nanovdb::openToNanoVDB(
openvdb::FloatGrid(*openvdb::gridConstPtrCast<openvdb::Int32Grid>(grid)));
# endif
}
else if (grid->isType<openvdb::Int64Grid>()) {
metadata.channels = 1;
# ifdef WITH_NANOVDB
nanogrid = nanovdb::openToNanoVDB(
openvdb::FloatGrid(*openvdb::gridConstPtrCast<openvdb::Int64Grid>(grid)));
# endif
}
else if (grid->isType<openvdb::Vec3IGrid>()) {
metadata.channels = 3;
# ifdef WITH_NANOVDB
nanogrid = nanovdb::openToNanoVDB(
openvdb::Vec3fGrid(*openvdb::gridConstPtrCast<openvdb::Vec3IGrid>(grid)));
# endif
}
else if (grid->isType<openvdb::Vec3dGrid>()) {
metadata.channels = 3;
# ifdef WITH_NANOVDB
nanogrid = nanovdb::openToNanoVDB(
openvdb::Vec3fGrid(*openvdb::gridConstPtrCast<openvdb::Vec3dGrid>(grid)));
# endif
}
else if (grid->isType<openvdb::MaskGrid>()) {
metadata.channels = 1;
# ifdef WITH_NANOVDB
return false; // Unsupported
# endif
}
else {
return false;
}
# ifdef WITH_NANOVDB
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
if (metadata.channels == 1) {
metadata.type = IMAGE_DATA_TYPE_FLOAT;
}
else {
metadata.type = IMAGE_DATA_TYPE_FLOAT4;
}
# endif
/* 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 = 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;
return true;
#else
(void)metadata;
return false;
#endif
}
bool VDBImageLoader::load_pixels(const ImageMetaData &, void *pixels, const size_t, const bool)
{
#if defined(WITH_NANOVDB)
memcpy(pixels, nanogrid.data(), nanogrid.size());
return true;
#elif defined(WITH_OPENVDB)
if (grid->isType<openvdb::FloatGrid>()) {
openvdb::tools::Dense<float, openvdb::tools::LayoutXYZ> dense(bbox, (float *)pixels);
openvdb::tools::copyToDense(*openvdb::gridConstPtrCast<openvdb::FloatGrid>(grid), dense);
}
else if (grid->isType<openvdb::Vec3fGrid>()) {
openvdb::tools::Dense<openvdb::Vec3f, openvdb::tools::LayoutXYZ> dense(
bbox, (openvdb::Vec3f *)pixels);
openvdb::tools::copyToDense(*openvdb::gridConstPtrCast<openvdb::Vec3fGrid>(grid), dense);
}
else if (grid->isType<openvdb::BoolGrid>()) {
openvdb::tools::Dense<float, openvdb::tools::LayoutXYZ> dense(bbox, (float *)pixels);
openvdb::tools::copyToDense(*openvdb::gridConstPtrCast<openvdb::BoolGrid>(grid), dense);
}
else if (grid->isType<openvdb::DoubleGrid>()) {
openvdb::tools::Dense<float, openvdb::tools::LayoutXYZ> dense(bbox, (float *)pixels);
openvdb::tools::copyToDense(*openvdb::gridConstPtrCast<openvdb::DoubleGrid>(grid), dense);
}
else if (grid->isType<openvdb::Int32Grid>()) {
openvdb::tools::Dense<float, openvdb::tools::LayoutXYZ> dense(bbox, (float *)pixels);
openvdb::tools::copyToDense(*openvdb::gridConstPtrCast<openvdb::Int32Grid>(grid), dense);
}
else if (grid->isType<openvdb::Int64Grid>()) {
openvdb::tools::Dense<float, openvdb::tools::LayoutXYZ> dense(bbox, (float *)pixels);
openvdb::tools::copyToDense(*openvdb::gridConstPtrCast<openvdb::Int64Grid>(grid), dense);
}
else if (grid->isType<openvdb::Vec3IGrid>()) {
openvdb::tools::Dense<openvdb::Vec3f, openvdb::tools::LayoutXYZ> dense(
bbox, (openvdb::Vec3f *)pixels);
openvdb::tools::copyToDense(*openvdb::gridConstPtrCast<openvdb::Vec3IGrid>(grid), dense);
}
else if (grid->isType<openvdb::Vec3dGrid>()) {
openvdb::tools::Dense<openvdb::Vec3f, openvdb::tools::LayoutXYZ> dense(
bbox, (openvdb::Vec3f *)pixels);
openvdb::tools::copyToDense(*openvdb::gridConstPtrCast<openvdb::Vec3dGrid>(grid), dense);
}
else if (grid->isType<openvdb::MaskGrid>()) {
openvdb::tools::Dense<float, openvdb::tools::LayoutXYZ> dense(bbox, (float *)pixels);
openvdb::tools::copyToDense(*openvdb::gridConstPtrCast<openvdb::MaskGrid>(grid), dense);
}
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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