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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2020 Blender Foundation.
* All rights reserved.
*/
#include "usd_prim_iterator.h"
#include "usd.h"
#include "usd_data_cache.h"
#include "usd_importer_context.h"
#include "usd_reader_camera.h"
#include "usd_reader_light.h"
#include "usd_reader_mesh.h"
#include "usd_reader_xform.h"
#include "usd_reader_xformable.h"
#include <iostream>
#include <pxr/pxr.h>
#include <pxr/usd/usd/prim.h>
#include <pxr/usd/usd/primRange.h>
#include <pxr/usd/usd/stage.h>
#include <pxr/usd/usdGeom/camera.h>
#include <pxr/usd/usdGeom/mesh.h>
#include <pxr/usd/usdGeom/scope.h>
#include <pxr/usd/usdGeom/tokens.h>
#include <pxr/usd/usdGeom/xformable.h>
#include <pxr/usd/usdLux/light.h>
namespace blender::io::usd {
USDPrimIterator::USDPrimIterator(pxr::UsdStageRefPtr stage,
const USDImporterContext &context,
Main *bmain)
: stage_(stage), context_(context), bmain_(bmain)
{
}
void USDPrimIterator::create_object_readers(std::vector<USDXformableReader *> &r_readers) const
{
if (!stage_) {
return;
}
std::vector<USDXformableReader *> child_readers;
create_object_readers(stage_->GetPseudoRoot(), context_, r_readers, child_readers);
}
void USDPrimIterator::create_prototype_object_readers(
std::map<pxr::SdfPath, USDXformableReader *> &r_proto_readers) const
{
if (!stage_) {
return;
}
std::vector<pxr::UsdPrim> protos = stage_->GetMasters();
for (const pxr::UsdPrim &proto_prim : protos) {
std::vector<USDXformableReader *> proto_readers;
std::vector<USDXformableReader *> child_readers;
create_object_readers(proto_prim, context_, proto_readers, child_readers);
for (USDXformableReader *reader : proto_readers) {
if (reader) {
pxr::UsdPrim reader_prim = reader->prim();
if (reader_prim) {
r_proto_readers.insert(std::make_pair(reader_prim.GetPath(), reader));
}
}
}
}
}
void USDPrimIterator::debug_traverse_stage() const
{
debug_traverse_stage(stage_);
}
USDXformableReader *USDPrimIterator::get_object_reader(const pxr::UsdPrim &prim,
const USDImporterContext &context)
{
USDXformableReader *result = nullptr;
if (prim.IsA<pxr::UsdGeomCamera>()) {
result = new USDCameraReader(prim, context);
}
else if (prim.IsA<pxr::UsdGeomMesh>()) {
result = new USDMeshReader(prim, context);
}
else if (prim.IsA<pxr::UsdGeomXform>()) {
result = new USDXformReader(prim, context);
}
else if (prim.IsA<pxr::UsdLuxLight>()) {
result = new USDLightReader(prim, context);
}
return result;
}
void USDPrimIterator::create_object_readers(const pxr::UsdPrim &prim,
const USDImporterContext &context,
std::vector<USDXformableReader *> &r_readers,
std::vector<USDXformableReader *> &r_child_readers)
{
if (!prim) {
return;
}
std::vector<USDXformableReader *> child_readers;
/* Recursively create readers for the child prims. */
pxr::UsdPrimSiblingRange child_prims = prim.GetFilteredChildren(
pxr::UsdTraverseInstanceProxies(pxr::UsdPrimDefaultPredicate));
for (const pxr::UsdPrim &child_prim : child_prims) {
create_object_readers(child_prim, context, r_readers, child_readers);
}
if (prim.IsPseudoRoot()) {
/* We're at the pseudo root, so we're done. */
return;
}
/* We prune away empty transform or scope hierarchies (we can add an import flag to make this
* behavior optional). Therefore, we skip this prim if it's an Xform or Scope and if
* it has no corresponding child readers. */
if ((prim.IsA<pxr::UsdGeomXform>() || prim.IsA<pxr::UsdGeomScope>()) && child_readers.empty()) {
return;
}
/* If this is an Xform prim, see if we can merge with the child reader. */
if (prim.IsA<pxr::UsdGeomXform>() && child_readers.size() == 1 &&
!child_readers.front()->merged_with_parent() &&
child_readers.front()->can_merge_with_parent()) {
child_readers.front()->set_merged_with_parent(true);
/* Don't create a reader for the Xform but, instead, return the child
* that we merged. */
r_child_readers.push_back(child_readers.front());
return;
}
USDXformableReader *reader = get_object_reader(prim, context);
if (reader) {
for (USDXformableReader *child_reader : child_readers) {
child_reader->set_parent(reader);
}
r_child_readers.push_back(reader);
r_readers.push_back(reader);
}
else {
/* No reader was allocated for this prim, so we pass our child readers back to the caller,
* for possible handling by a parent reader. */
r_child_readers.insert(r_child_readers.end(), child_readers.begin(), child_readers.end());
}
}
void USDPrimIterator::cache_prototype_data(USDDataCache &r_cache) const
{
if (!stage_) {
return;
}
std::vector<pxr::UsdPrim> protos = stage_->GetMasters();
for (const pxr::UsdPrim &proto_prim : protos) {
std::vector<USDXformableReader *> proto_readers;
std::vector<USDXformableReader *> child_readers;
create_object_readers(proto_prim, context_, proto_readers, child_readers);
for (USDXformableReader *reader : proto_readers) {
if (reader) {
pxr::UsdPrim reader_prim = reader->prim();
if (reader_prim) {
if (USDMeshReaderBase *mesh_reader = dynamic_cast<USDMeshReaderBase *>(reader)) {
Mesh *proto_mesh = mesh_reader->create_mesh(bmain_, 0.0);
if (proto_mesh) {
/* TODO(makowalski): Do we want to decrement the mesh's use count to 0?
* Might have a small memory leak otherwise. Also, check if mesh is
* already in cache before adding? */
r_cache.add_prototype_mesh(reader_prim.GetPath(), proto_mesh);
}
}
}
}
}
/* Clean up the readers. */
for (USDXformableReader *reader : proto_readers) {
delete reader;
}
}
}
void USDPrimIterator::debug_traverse_stage(const pxr::UsdStageRefPtr &usd_stage)
{
if (!usd_stage) {
return;
}
pxr::UsdPrimRange prims = usd_stage->Traverse(
pxr::UsdTraverseInstanceProxies(pxr::UsdPrimAllPrimsPredicate));
for (const pxr::UsdPrim &prim : prims) {
std::cout << prim.GetPath() << std::endl;
std::cout << " Type: " << prim.GetTypeName() << std::endl;
if (prim.IsInstanceProxy()) {
pxr::UsdPrim proto_prim = prim.GetPrimInMaster();
if (proto_prim) {
std::cout << " Prototype prim: " << proto_prim.GetPath() << std::endl;
}
}
}
}
} /* namespace blender::io::usd */
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