impeller::DescriptorPoolVK Class Reference

A per-frame descriptor pool. Descriptors from this pool don't need to be freed individually. Instead, the pool must be collected after all the descriptors allocated from it are done being used. More...

#include <descriptor_pool_vk.h>

Public Member Functions
	DescriptorPoolVK (std::weak_ptr< const ContextVK > context)
	~DescriptorPoolVK ()
fml::StatusOr< vk::DescriptorSet >	AllocateDescriptorSets (const vk::DescriptorSetLayout &layout, const ContextVK &context_vk)

Detailed Description

A per-frame descriptor pool. Descriptors from this pool don't need to be freed individually. Instead, the pool must be collected after all the descriptors allocated from it are done being used.

The pool or it's descriptors may not be accessed from multiple threads.

Encoders create pools as necessary as they have the same threading and lifecycle restrictions.

Definition at line 27 of file descriptor_pool_vk.h.

Constructor & Destructor Documentation

DescriptorPoolVK()

impeller::DescriptorPoolVK::DescriptorPoolVK ( std::weak_ptr< const ContextVK >  context )

explicit

Definition at line 67 of file descriptor_pool_vk.cc.

    : context_(std::move(context)) {}

~DescriptorPoolVK()

impeller::DescriptorPoolVK::~DescriptorPoolVK

(

)

Definition at line 70 of file descriptor_pool_vk.cc.

                                    {
  if (pools_.empty()) {
    return;
  }
 
  auto const context = context_.lock();
  if (!context) {
    return;
  }
  auto const recycler = context->GetDescriptorPoolRecycler();
  if (!recycler) {
    return;
  }
 
  for (auto i = 0u; i < pools_.size(); i++) {
    auto reset_pool_when_dropped =
        BackgroundDescriptorPoolVK(std::move(pools_[i]), recycler);
 
    UniqueResourceVKT<BackgroundDescriptorPoolVK> pool(
        context->GetResourceManager(), std::move(reset_pool_when_dropped));
  }
  pools_.clear();
}

Member Function Documentation

AllocateDescriptorSets()

fml::StatusOr< vk::DescriptorSet > impeller::DescriptorPoolVK::AllocateDescriptorSets	(	const vk::DescriptorSetLayout &	layout,
		const ContextVK &	context_vk
	)

Definition at line 94 of file descriptor_pool_vk.cc.

                                 {
  if (pools_.empty()) {
    CreateNewPool(context_vk);
  }
 
  vk::DescriptorSetAllocateInfo set_info;
  set_info.setDescriptorPool(pools_.back().get());
  set_info.setPSetLayouts(&layout);
  set_info.setDescriptorSetCount(1);
 
  vk::DescriptorSet set;
  auto result = context_vk.GetDevice().allocateDescriptorSets(&set_info, &set);
  if (result == vk::Result::eErrorOutOfPoolMemory) {
    // If the pool ran out of memory, we need to create a new pool.
    CreateNewPool(context_vk);
    set_info.setDescriptorPool(pools_.back().get());
    result = context_vk.GetDevice().allocateDescriptorSets(&set_info, &set);
  }
 
  if (result != vk::Result::eSuccess) {
    VALIDATION_LOG << "Could not allocate descriptor sets: "
                   << vk::to_string(result);
    return fml::Status(fml::StatusCode::kUnknown, "");
  }
  return set;
}

---

The documentation for this class was generated from the following files:

• impeller/renderer/backend/vulkan/descriptor_pool_vk.h
• impeller/renderer/backend/vulkan/descriptor_pool_vk.cc