impeller/scene/node.cc - mirrors/engine - Git at Google

 // Copyright 2013 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "impeller/scene/node.h"

 #include <inttypes.h>
 #include <atomic>
 #include <memory>
 #include <vector>

 #include "flutter/fml/logging.h"
 #include "impeller/base/strings.h"
 #include "impeller/base/thread.h"
 #include "impeller/base/validation.h"
 #include "impeller/geometry/matrix.h"
 #include "impeller/scene/animation/animation_player.h"
 #include "impeller/scene/importer/conversions.h"
 #include "impeller/scene/importer/scene_flatbuffers.h"
 #include "impeller/scene/mesh.h"
 #include "impeller/scene/node.h"
 #include "impeller/scene/scene_encoder.h"

 namespace impeller {
 namespace scene {

 static std::atomic_uint64_t kNextNodeID = 0;

 void Node::MutationLog::Append(const Entry& entry) {
   WriterLock lock(write_mutex_);
   dirty_ = true;
   entries_.push_back(entry);
 }

 std::optional<std::vector<Node::MutationLog::Entry>>
 Node::MutationLog::Flush() {
   WriterLock lock(write_mutex_);
   if (!dirty_) {
     return std::nullopt;
   }
   dirty_ = false;
   auto result = entries_;
   entries_ = {};
   return result;
 }

 std::shared_ptr<Node> Node::MakeFromFlatbuffer(
     const fml::Mapping& ipscene_mapping,
     Allocator& allocator) {
   flatbuffers::Verifier verifier(ipscene_mapping.GetMapping(),
                                  ipscene_mapping.GetSize());
   if (!fb::VerifySceneBuffer(verifier)) {
     VALIDATION_LOG << "Failed to unpack scene: Scene flatbuffer is invalid.";
     return nullptr;
   }

   return Node::MakeFromFlatbuffer(*fb::GetScene(ipscene_mapping.GetMapping()),
                                   allocator);
 }

 static std::shared_ptr<Texture> UnpackTextureFromFlatbuffer(
     const fb::Texture* iptexture,
     Allocator& allocator) {
   if (iptexture == nullptr || iptexture->embedded_image() == nullptr ||
       iptexture->embedded_image()->bytes() == nullptr) {
     return nullptr;
   }

   auto embedded = iptexture->embedded_image();

   uint8_t bytes_per_component = 0;
   switch (embedded->component_type()) {
     case fb::ComponentType::k8Bit:
       bytes_per_component = 1;
       break;
     case fb::ComponentType::k16Bit:
       // bytes_per_component = 2;
       FML_LOG(WARNING) << "16 bit textures not yet supported.";
       return nullptr;
   }

   switch (embedded->component_count()) {
     case 4:
       // RGBA.
       break;
     case 1:
     case 3:
     default:
       FML_LOG(WARNING) << "Textures with " << embedded->component_count()
                        << " components are not supported." << std::endl;
       return nullptr;
   }
   if (embedded->bytes()->size() != bytes_per_component *
                                        embedded->component_count() *
                                        embedded->width() * embedded->height()) {
     FML_LOG(WARNING) << "Embedded texture has an unexpected size. Skipping."
                      << std::endl;
     return nullptr;
   }

   auto image_mapping = std::make_shared<fml::NonOwnedMapping>(
       embedded->bytes()->Data(), embedded->bytes()->size());

   auto texture_descriptor = TextureDescriptor{};
   texture_descriptor.storage_mode = StorageMode::kHostVisible;
   texture_descriptor.format = PixelFormat::kR8G8B8A8UNormInt;
   texture_descriptor.size = ISize(embedded->width(), embedded->height());
   // TODO(bdero): Generate mipmaps for embedded textures.
   texture_descriptor.mip_count = 1u;

   auto texture = allocator.CreateTexture(texture_descriptor);
   if (!texture) {
     FML_LOG(ERROR) << "Could not allocate texture.";
     return nullptr;
   }

   auto uploaded = texture->SetContents(image_mapping);
   if (!uploaded) {
     FML_LOG(ERROR) << "Could not upload texture to device memory.";
     return nullptr;
   }

   return texture;
 }

 std::shared_ptr<Node> Node::MakeFromFlatbuffer(const fb::Scene& scene,
                                                Allocator& allocator) {
   // Unpack textures.
   std::vector<std::shared_ptr<Texture>> textures;
   if (scene.textures()) {
     for (const auto iptexture : *scene.textures()) {
       // The elements of the unpacked texture array must correspond exactly with
       // the ipscene texture array. So if a texture is empty or invalid, a
       // nullptr is inserted as a placeholder.
       textures.push_back(UnpackTextureFromFlatbuffer(iptexture, allocator));
     }
   }

   auto result = std::make_shared<Node>();
   result->SetLocalTransform(importer::ToMatrix(*scene.transform()));

   if (!scene.nodes() || !scene.children()) {
     return result;  // The scene is empty.
   }

   // Initialize nodes for unpacking the entire scene.
   std::vector<std::shared_ptr<Node>> scene_nodes;
   scene_nodes.reserve(scene.nodes()->size());
   for (size_t node_i = 0; node_i < scene.nodes()->size(); node_i++) {
     scene_nodes.push_back(std::make_shared<Node>());
   }

   // Connect children to the root node.
   for (int child : *scene.children()) {
     if (child < 0 || static_cast<size_t>(child) >= scene_nodes.size()) {
       VALIDATION_LOG << "Scene child index out of range.";
       continue;
     }
     result->AddChild(scene_nodes[child]);
   }

   // Unpack each node.
   for (size_t node_i = 0; node_i < scene.nodes()->size(); node_i++) {
     scene_nodes[node_i]->UnpackFromFlatbuffer(*scene.nodes()->Get(node_i),
                                               scene_nodes, textures, allocator);
   }

   // Unpack animations.
   if (scene.animations()) {
     for (const auto animation : *scene.animations()) {
       if (auto out_animation =
               Animation::MakeFromFlatbuffer(*animation, scene_nodes)) {
         result->animations_.push_back(out_animation);
       }
     }
   }

   return result;
 }

 void Node::UnpackFromFlatbuffer(
     const fb::Node& source_node,
     const std::vector<std::shared_ptr<Node>>& scene_nodes,
     const std::vector<std::shared_ptr<Texture>>& textures,
     Allocator& allocator) {
   name_ = source_node.name()->str();
   SetLocalTransform(importer::ToMatrix(*source_node.transform()));

   /// Meshes.

   if (source_node.mesh_primitives()) {
     Mesh mesh;
     for (const auto* primitives : *source_node.mesh_primitives()) {
       auto geometry = Geometry::MakeFromFlatbuffer(*primitives, allocator);
       auto material =
           primitives->material()
               ? Material::MakeFromFlatbuffer(*primitives->material(), textures)
               : Material::MakeUnlit();
       mesh.AddPrimitive({std::move(geometry), std::move(material)});
     }
     SetMesh(std::move(mesh));
   }

   /// Child nodes.

   if (source_node.children()) {
     // Wire up graph connections.
     for (int child : *source_node.children()) {
       if (child < 0 || static_cast<size_t>(child) >= scene_nodes.size()) {
         VALIDATION_LOG << "Node child index out of range.";
         continue;
       }
       AddChild(scene_nodes[child]);
     }
   }

   /// Skin.

   if (source_node.skin()) {
     skin_ = Skin::MakeFromFlatbuffer(*source_node.skin(), scene_nodes);
   }
 }

 Node::Node() : name_(SPrintF("__node%" PRIu64, kNextNodeID++)){};

 Node::~Node() = default;

 Mesh::Mesh(Mesh&& mesh) = default;

 Mesh& Mesh::operator=(Mesh&& mesh) = default;

 const std::string& Node::GetName() const {
   return name_;
 }

 void Node::SetName(const std::string& new_name) {
   name_ = new_name;
 }

 Node* Node::GetParent() const {
   return parent_;
 }

 std::shared_ptr<Node> Node::FindChildByName(
     const std::string& name,
     bool exclude_animation_players) const {
   for (auto& child : children_) {
     if (exclude_animation_players && child->animation_player_.has_value()) {
       continue;
     }
     if (child->GetName() == name) {
       return child;
     }
     if (auto found = child->FindChildByName(name)) {
       return found;
     }
   }
   return nullptr;
 }

 std::shared_ptr<Animation> Node::FindAnimationByName(
     const std::string& name) const {
   for (const auto& animation : animations_) {
     if (animation->GetName() == name) {
       return animation;
     }
   }
   return nullptr;
 }

 AnimationClip* Node::AddAnimation(const std::shared_ptr<Animation>& animation) {
   if (!animation_player_.has_value()) {
     animation_player_ = AnimationPlayer();
   }
   return animation_player_->AddAnimation(animation, this);
 }

 void Node::SetLocalTransform(Matrix transform) {
   local_transform_ = transform;
 }

 Matrix Node::GetLocalTransform() const {
   return local_transform_;
 }

 void Node::SetGlobalTransform(Matrix transform) {
   Matrix inverse_global_transform =
       parent_ ? parent_->GetGlobalTransform().Invert() : Matrix();

   local_transform_ = inverse_global_transform * transform;
 }

 Matrix Node::GetGlobalTransform() const {
   if (parent_) {
     return parent_->GetGlobalTransform() * local_transform_;
   }
   return local_transform_;
 }

 bool Node::AddChild(std::shared_ptr<Node> node) {
   if (!node) {
     VALIDATION_LOG << "Cannot add null child to node.";
     return false;
   }

   // TODO(bdero): Figure out a better paradigm/rules for nodes with multiple
   //              parents. We should probably disallow this, make deep
   //              copying of nodes cheap and easy, add mesh instancing, etc.
   //              Today, the parent link is only used for skin posing, and so
   //              it's reasonable to not have a check and allow multi-parenting.
   //              Even still, there should still be some kind of cycle
   //              prevention/detection, ideally at the protocol level.
   //
   // if (node->parent_ != nullptr) {
   //   VALIDATION_LOG
   //       << "Cannot add a node as a child which already has a parent.";
   //   return false;
   // }
   node->parent_ = this;
   children_.push_back(std::move(node));

   return true;
 }

 std::vector<std::shared_ptr<Node>>& Node::GetChildren() {
   return children_;
 }

 void Node::SetMesh(Mesh mesh) {
   mesh_ = std::move(mesh);
 }

 Mesh& Node::GetMesh() {
   return mesh_;
 }

 void Node::SetIsJoint(bool is_joint) {
   is_joint_ = is_joint;
 }

 bool Node::IsJoint() const {
   return is_joint_;
 }

 bool Node::Render(SceneEncoder& encoder,
                   Allocator& allocator,
                   const Matrix& parent_transform) {
   std::optional<std::vector<MutationLog::Entry>> log = mutation_log_.Flush();
   if (log.has_value()) {
     for (const auto& entry : log.value()) {
       if (auto e = std::get_if<MutationLog::SetTransformEntry>(&entry)) {
         local_transform_ = e->transform;
       } else if (auto e =
                      std::get_if<MutationLog::SetAnimationStateEntry>(&entry)) {
         AnimationClip* clip =
             animation_player_.has_value()
                 ? animation_player_->GetClip(e->animation_name)
                 : nullptr;
         if (!clip) {
           auto animation = FindAnimationByName(e->animation_name);
           if (!animation) {
             continue;
           }
           clip = AddAnimation(animation);
           if (!clip) {
             continue;
           }
         }

         clip->SetPlaying(e->playing);
         clip->SetLoop(e->loop);
         clip->SetWeight(e->weight);
         clip->SetPlaybackTimeScale(e->time_scale);
       } else if (auto e =
                      std::get_if<MutationLog::SeekAnimationEntry>(&entry)) {
         AnimationClip* clip =
             animation_player_.has_value()
                 ? animation_player_->GetClip(e->animation_name)
                 : nullptr;
         if (!clip) {
           auto animation = FindAnimationByName(e->animation_name);
           if (!animation) {
             continue;
           }
           clip = AddAnimation(animation);
           if (!clip) {
             continue;
           }
         }

         clip->Seek(SecondsF(e->time));
       }
     }
   }

   if (animation_player_.has_value()) {
     animation_player_->Update();
   }

   Matrix transform = parent_transform * local_transform_;
   mesh_.Render(encoder, transform,
                skin_ ? skin_->GetJointsTexture(allocator) : nullptr);

   for (auto& child : children_) {
     if (!child->Render(encoder, allocator, transform)) {
       return false;
     }
   }
   return true;
 }

 void Node::AddMutation(const MutationLog::Entry& entry) {
   mutation_log_.Append(entry);
 }

 }  // namespace scene
 }  // namespace impeller
	// Copyright 2013 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "impeller/scene/node.h"

	#include <inttypes.h>
	#include <atomic>
	#include <memory>
	#include <vector>

	#include "flutter/fml/logging.h"
	#include "impeller/base/strings.h"
	#include "impeller/base/thread.h"
	#include "impeller/base/validation.h"
	#include "impeller/geometry/matrix.h"
	#include "impeller/scene/animation/animation_player.h"
	#include "impeller/scene/importer/conversions.h"
	#include "impeller/scene/importer/scene_flatbuffers.h"
	#include "impeller/scene/mesh.h"
	#include "impeller/scene/node.h"
	#include "impeller/scene/scene_encoder.h"

	namespace impeller {
	namespace scene {

	static std::atomic_uint64_t kNextNodeID = 0;

	void Node::MutationLog::Append(const Entry& entry) {
	WriterLock lock(write_mutex_);
	dirty_ = true;
	entries_.push_back(entry);
	}

	std::optional<std::vector<Node::MutationLog::Entry>>
	Node::MutationLog::Flush() {
	WriterLock lock(write_mutex_);
	if (!dirty_) {
	return std::nullopt;
	}
	dirty_ = false;
	auto result = entries_;
	entries_ = {};
	return result;
	}

	std::shared_ptr<Node> Node::MakeFromFlatbuffer(
	const fml::Mapping& ipscene_mapping,
	Allocator& allocator) {
	flatbuffers::Verifier verifier(ipscene_mapping.GetMapping(),
	ipscene_mapping.GetSize());
	if (!fb::VerifySceneBuffer(verifier)) {
	VALIDATION_LOG << "Failed to unpack scene: Scene flatbuffer is invalid.";
	return nullptr;
	}

	return Node::MakeFromFlatbuffer(*fb::GetScene(ipscene_mapping.GetMapping()),
	allocator);
	}

	static std::shared_ptr<Texture> UnpackTextureFromFlatbuffer(
	const fb::Texture* iptexture,
	Allocator& allocator) {
	if (iptexture == nullptr \|\| iptexture->embedded_image() == nullptr \|\|
	iptexture->embedded_image()->bytes() == nullptr) {
	return nullptr;
	}

	auto embedded = iptexture->embedded_image();

	uint8_t bytes_per_component = 0;
	switch (embedded->component_type()) {
	case fb::ComponentType::k8Bit:
	bytes_per_component = 1;
	break;
	case fb::ComponentType::k16Bit:
	// bytes_per_component = 2;
	FML_LOG(WARNING) << "16 bit textures not yet supported.";
	return nullptr;
	}

	switch (embedded->component_count()) {
	case 4:
	// RGBA.
	break;
	case 1:
	case 3:
	default:
	FML_LOG(WARNING) << "Textures with " << embedded->component_count()
	<< " components are not supported." << std::endl;
	return nullptr;
	}
	if (embedded->bytes()->size() != bytes_per_component *
	embedded->component_count() *
	embedded->width() * embedded->height()) {
	FML_LOG(WARNING) << "Embedded texture has an unexpected size. Skipping."
	<< std::endl;
	return nullptr;
	}

	auto image_mapping = std::make_shared<fml::NonOwnedMapping>(
	embedded->bytes()->Data(), embedded->bytes()->size());

	auto texture_descriptor = TextureDescriptor{};
	texture_descriptor.storage_mode = StorageMode::kHostVisible;
	texture_descriptor.format = PixelFormat::kR8G8B8A8UNormInt;
	texture_descriptor.size = ISize(embedded->width(), embedded->height());
	// TODO(bdero): Generate mipmaps for embedded textures.
	texture_descriptor.mip_count = 1u;

	auto texture = allocator.CreateTexture(texture_descriptor);
	if (!texture) {
	FML_LOG(ERROR) << "Could not allocate texture.";
	return nullptr;
	}

	auto uploaded = texture->SetContents(image_mapping);
	if (!uploaded) {
	FML_LOG(ERROR) << "Could not upload texture to device memory.";
	return nullptr;
	}

	return texture;
	}

	std::shared_ptr<Node> Node::MakeFromFlatbuffer(const fb::Scene& scene,
	Allocator& allocator) {
	// Unpack textures.
	std::vector<std::shared_ptr<Texture>> textures;
	if (scene.textures()) {
	for (const auto iptexture : *scene.textures()) {
	// The elements of the unpacked texture array must correspond exactly with
	// the ipscene texture array. So if a texture is empty or invalid, a
	// nullptr is inserted as a placeholder.
	textures.push_back(UnpackTextureFromFlatbuffer(iptexture, allocator));
	}
	}

	auto result = std::make_shared<Node>();
	result->SetLocalTransform(importer::ToMatrix(*scene.transform()));

	if (!scene.nodes() \|\| !scene.children()) {
	return result; // The scene is empty.
	}

	// Initialize nodes for unpacking the entire scene.
	std::vector<std::shared_ptr<Node>> scene_nodes;
	scene_nodes.reserve(scene.nodes()->size());
	for (size_t node_i = 0; node_i < scene.nodes()->size(); node_i++) {
	scene_nodes.push_back(std::make_shared<Node>());
	}

	// Connect children to the root node.
	for (int child : *scene.children()) {
	if (child < 0 \|\| static_cast<size_t>(child) >= scene_nodes.size()) {
	VALIDATION_LOG << "Scene child index out of range.";
	continue;
	}
	result->AddChild(scene_nodes[child]);
	}

	// Unpack each node.
	for (size_t node_i = 0; node_i < scene.nodes()->size(); node_i++) {
	scene_nodes[node_i]->UnpackFromFlatbuffer(*scene.nodes()->Get(node_i),
	scene_nodes, textures, allocator);
	}

	// Unpack animations.
	if (scene.animations()) {
	for (const auto animation : *scene.animations()) {
	if (auto out_animation =
	Animation::MakeFromFlatbuffer(*animation, scene_nodes)) {
	result->animations_.push_back(out_animation);
	}
	}
	}

	return result;
	}

	void Node::UnpackFromFlatbuffer(
	const fb::Node& source_node,
	const std::vector<std::shared_ptr<Node>>& scene_nodes,
	const std::vector<std::shared_ptr<Texture>>& textures,
	Allocator& allocator) {
	name_ = source_node.name()->str();
	SetLocalTransform(importer::ToMatrix(*source_node.transform()));

	/// Meshes.

	if (source_node.mesh_primitives()) {
	Mesh mesh;
	for (const auto* primitives : *source_node.mesh_primitives()) {
	auto geometry = Geometry::MakeFromFlatbuffer(*primitives, allocator);
	auto material =
	primitives->material()
	? Material::MakeFromFlatbuffer(*primitives->material(), textures)
	: Material::MakeUnlit();
	mesh.AddPrimitive({std::move(geometry), std::move(material)});
	}
	SetMesh(std::move(mesh));
	}

	/// Child nodes.

	if (source_node.children()) {
	// Wire up graph connections.
	for (int child : *source_node.children()) {
	if (child < 0 \|\| static_cast<size_t>(child) >= scene_nodes.size()) {
	VALIDATION_LOG << "Node child index out of range.";
	continue;
	}
	AddChild(scene_nodes[child]);
	}
	}

	/// Skin.

	if (source_node.skin()) {
	skin_ = Skin::MakeFromFlatbuffer(*source_node.skin(), scene_nodes);
	}
	}

	Node::Node() : name_(SPrintF("__node%" PRIu64, kNextNodeID++)){};

	Node::~Node() = default;

	Mesh::Mesh(Mesh&& mesh) = default;

	Mesh& Mesh::operator=(Mesh&& mesh) = default;

	const std::string& Node::GetName() const {
	return name_;
	}

	void Node::SetName(const std::string& new_name) {
	name_ = new_name;
	}

	Node* Node::GetParent() const {
	return parent_;
	}

	std::shared_ptr<Node> Node::FindChildByName(
	const std::string& name,
	bool exclude_animation_players) const {
	for (auto& child : children_) {
	if (exclude_animation_players && child->animation_player_.has_value()) {
	continue;
	}
	if (child->GetName() == name) {
	return child;
	}
	if (auto found = child->FindChildByName(name)) {
	return found;
	}
	}
	return nullptr;
	}

	std::shared_ptr<Animation> Node::FindAnimationByName(
	const std::string& name) const {
	for (const auto& animation : animations_) {
	if (animation->GetName() == name) {
	return animation;
	}
	}
	return nullptr;
	}

	AnimationClip* Node::AddAnimation(const std::shared_ptr<Animation>& animation) {
	if (!animation_player_.has_value()) {
	animation_player_ = AnimationPlayer();
	}
	return animation_player_->AddAnimation(animation, this);
	}

	void Node::SetLocalTransform(Matrix transform) {
	local_transform_ = transform;
	}

	Matrix Node::GetLocalTransform() const {
	return local_transform_;
	}

	void Node::SetGlobalTransform(Matrix transform) {
	Matrix inverse_global_transform =
	parent_ ? parent_->GetGlobalTransform().Invert() : Matrix();

	local_transform_ = inverse_global_transform * transform;
	}

	Matrix Node::GetGlobalTransform() const {
	if (parent_) {
	return parent_->GetGlobalTransform() * local_transform_;
	}
	return local_transform_;
	}

	bool Node::AddChild(std::shared_ptr<Node> node) {
	if (!node) {
	VALIDATION_LOG << "Cannot add null child to node.";
	return false;
	}

	// TODO(bdero): Figure out a better paradigm/rules for nodes with multiple
	// parents. We should probably disallow this, make deep
	// copying of nodes cheap and easy, add mesh instancing, etc.
	// Today, the parent link is only used for skin posing, and so
	// it's reasonable to not have a check and allow multi-parenting.
	// Even still, there should still be some kind of cycle
	// prevention/detection, ideally at the protocol level.
	//
	// if (node->parent_ != nullptr) {
	// VALIDATION_LOG
	// << "Cannot add a node as a child which already has a parent.";
	// return false;
	// }
	node->parent_ = this;
	children_.push_back(std::move(node));

	return true;
	}

	std::vector<std::shared_ptr<Node>>& Node::GetChildren() {
	return children_;
	}

	void Node::SetMesh(Mesh mesh) {
	mesh_ = std::move(mesh);
	}

	Mesh& Node::GetMesh() {
	return mesh_;
	}

	void Node::SetIsJoint(bool is_joint) {
	is_joint_ = is_joint;
	}

	bool Node::IsJoint() const {
	return is_joint_;
	}

	bool Node::Render(SceneEncoder& encoder,
	Allocator& allocator,
	const Matrix& parent_transform) {
	std::optional<std::vector<MutationLog::Entry>> log = mutation_log_.Flush();
	if (log.has_value()) {
	for (const auto& entry : log.value()) {
	if (auto e = std::get_if<MutationLog::SetTransformEntry>(&entry)) {
	local_transform_ = e->transform;
	} else if (auto e =
	std::get_if<MutationLog::SetAnimationStateEntry>(&entry)) {
	AnimationClip* clip =
	animation_player_.has_value()
	? animation_player_->GetClip(e->animation_name)
	: nullptr;
	if (!clip) {
	auto animation = FindAnimationByName(e->animation_name);
	if (!animation) {
	continue;
	}
	clip = AddAnimation(animation);
	if (!clip) {
	continue;
	}
	}

	clip->SetPlaying(e->playing);
	clip->SetLoop(e->loop);
	clip->SetWeight(e->weight);
	clip->SetPlaybackTimeScale(e->time_scale);
	} else if (auto e =
	std::get_if<MutationLog::SeekAnimationEntry>(&entry)) {
	AnimationClip* clip =
	animation_player_.has_value()
	? animation_player_->GetClip(e->animation_name)
	: nullptr;
	if (!clip) {
	auto animation = FindAnimationByName(e->animation_name);
	if (!animation) {
	continue;
	}
	clip = AddAnimation(animation);
	if (!clip) {
	continue;
	}
	}

	clip->Seek(SecondsF(e->time));
	}
	}
	}

	if (animation_player_.has_value()) {
	animation_player_->Update();
	}

	Matrix transform = parent_transform * local_transform_;
	mesh_.Render(encoder, transform,
	skin_ ? skin_->GetJointsTexture(allocator) : nullptr);

	for (auto& child : children_) {
	if (!child->Render(encoder, allocator, transform)) {
	return false;
	}
	}
	return true;
	}

	void Node::AddMutation(const MutationLog::Entry& entry) {
	mutation_log_.Append(entry);
	}

	} // namespace scene
	} // namespace impeller