impeller::CommandQueueVK Class Reference

#include <command_queue_vk.h>

Inheritance diagram for impeller::CommandQueueVK:

Public Member Functions
	CommandQueueVK (const std::weak_ptr< ContextVK > &context)
	~CommandQueueVK () override
fml::Status	Submit (const std::vector< std::shared_ptr< CommandBuffer > > &buffers, const CompletionCallback &completion_callback={}) override
	Submit one or more command buffer objects to be encoded and executed on the GPU.
Public Member Functions inherited from impeller::CommandQueue
	CommandQueue ()
virtual	~CommandQueue ()

Additional Inherited Members
Public Types inherited from impeller::CommandQueue
using	CompletionCallback = std::function< void(CommandBuffer::Status)>

Detailed Description

Definition at line 14 of file command_queue_vk.h.

Constructor & Destructor Documentation

CommandQueueVK()

impeller::CommandQueueVK::CommandQueueVK ( const std::weak_ptr< ContextVK > &  context )

explicit

Definition at line 19 of file command_queue_vk.cc.

    : context_(context) {}

~CommandQueueVK()

impeller::CommandQueueVK::~CommandQueueVK ( )

overridedefault

Member Function Documentation

Submit()

fml::Status impeller::CommandQueueVK::Submit ( const std::vector< std::shared_ptr< CommandBuffer > > &  buffers, const CompletionCallback &  completion_callback = {}  )

overridevirtual

Submit one or more command buffer objects to be encoded and executed on the GPU.

The order of the provided buffers determines the ordering in which they are submitted.

The returned status only indicates if the command buffer was successfully submitted. Successful completion of the command buffer can only be checked in the optional completion callback.

Only the Metal and Vulkan backends can give a status beyond successful encoding. This callback may be called more than once and potentially on a different thread.

Reimplemented from impeller::CommandQueue.

Definition at line 24 of file command_queue_vk.cc.

                                                   {
  if (buffers.empty()) {
    return fml::Status(fml::StatusCode::kInvalidArgument,
                       "No command buffers provided.");
  }
  // Success or failure, you only get to submit once.
  fml::ScopedCleanupClosure reset([&]() {
    if (completion_callback) {
      completion_callback(CommandBuffer::Status::kError);
    }
  });
 
  std::vector<vk::CommandBuffer> vk_buffers;
  std::vector<std::shared_ptr<TrackedObjectsVK>> tracked_objects;
  vk_buffers.reserve(buffers.size());
  tracked_objects.reserve(buffers.size());
  for (const std::shared_ptr<CommandBuffer>& buffer : buffers) {
    auto encoder = CommandBufferVK::Cast(*buffer).GetEncoder();
    if (!encoder->EndCommandBuffer()) {
      return fml::Status(fml::StatusCode::kCancelled,
                         "Failed to end command buffer.");
    }
    tracked_objects.push_back(encoder->tracked_objects_);
    vk_buffers.push_back(encoder->GetCommandBuffer());
    encoder->Reset();
  }
 
  auto context = context_.lock();
  if (!context) {
    VALIDATION_LOG << "Device lost.";
    return fml::Status(fml::StatusCode::kCancelled, "Device lost.");
  }
  auto [fence_result, fence] = context->GetDevice().createFenceUnique({});
  if (fence_result != vk::Result::eSuccess) {
    VALIDATION_LOG << "Failed to create fence: " << vk::to_string(fence_result);
    return fml::Status(fml::StatusCode::kCancelled, "Failed to create fence.");
  }
 
  vk::SubmitInfo submit_info;
  submit_info.setCommandBuffers(vk_buffers);
  auto status = context->GetGraphicsQueue()->Submit(submit_info, *fence);
  if (status != vk::Result::eSuccess) {
    VALIDATION_LOG << "Failed to submit queue: " << vk::to_string(status);
    return fml::Status(fml::StatusCode::kCancelled, "Failed to submit queue: ");
  }
 
  // Submit will proceed, call callback with true when it is done and do not
  // call when `reset` is collected.
  auto added_fence = context->GetFenceWaiter()->AddFence(
      std::move(fence), [completion_callback, tracked_objects = std::move(
                                                  tracked_objects)]() mutable {
        // Ensure tracked objects are destructed before calling any final
        // callbacks.
        tracked_objects.clear();
        if (completion_callback) {
          completion_callback(CommandBuffer::Status::kCompleted);
        }
      });
  if (!added_fence) {
    return fml::Status(fml::StatusCode::kCancelled, "Failed to add fence.");
  }
  reset.Release();
  return fml::Status();
}

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

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