#include <context_vk.h>

Inheritance diagram for impeller::ContextVK:

Classes
struct	Settings

Public Member Functions
uint64_t	GetHash () const

	~ContextVK () override

BackendType	GetBackendType () const override
	Get the graphics backend of an Impeller context. More...

std::string	DescribeGpuModel () const override

bool	IsValid () const override
	Determines if a context is valid. If the caller ever receives an invalid context, they must discard it and construct a new context. There is no recovery mechanism to repair a bad context. More...

std::shared_ptr< Allocator >	GetResourceAllocator () const override
	Returns the allocator used to create textures and buffers on the device. More...

std::shared_ptr< ShaderLibrary >	GetShaderLibrary () const override
	Returns the library of shaders used to specify the programmable stages of a pipeline. More...

std::shared_ptr< SamplerLibrary >	GetSamplerLibrary () const override
	Returns the library of combined image samplers used in shaders. More...

std::shared_ptr< PipelineLibrary >	GetPipelineLibrary () const override
	Returns the library of pipelines used by render or compute commands. More...

std::shared_ptr< CommandBuffer >	CreateCommandBuffer () const override
	Create a new command buffer. Command buffers can be used to encode graphics, blit, or compute commands to be submitted to the device. More...

const std::shared_ptr< const Capabilities > &	GetCapabilities () const override
	Get the capabilities of Impeller context. All optionally supported feature of the platform, client-rendering API, and device can be queried using the `Capabilities`. More...

const std::shared_ptr< YUVConversionLibraryVK > &	GetYUVConversionLibrary () const

void	Shutdown () override
	Force all pending asynchronous work to finish. This is achieved by deleting all owned concurrent message loops. More...

void	SetOffscreenFormat (PixelFormat pixel_format)

template<typename T >
bool	SetDebugName (T handle, std::string_view label) const

std::shared_ptr< DeviceHolderVK >	GetDeviceHolder () const

vk::Instance	GetInstance () const

const vk::Device &	GetDevice () const

const std::unique_ptr< DriverInfoVK > &	GetDriverInfo () const

const std::shared_ptr< fml::ConcurrentTaskRunner >	GetConcurrentWorkerTaskRunner () const

std::shared_ptr< SurfaceContextVK >	CreateSurfaceContext ()

const std::shared_ptr< QueueVK > &	GetGraphicsQueue () const

vk::PhysicalDevice	GetPhysicalDevice () const

std::shared_ptr< FenceWaiterVK >	GetFenceWaiter () const

std::shared_ptr< ResourceManagerVK >	GetResourceManager () const

std::shared_ptr< CommandPoolRecyclerVK >	GetCommandPoolRecycler () const

std::shared_ptr< DescriptorPoolRecyclerVK >	GetDescriptorPoolRecycler () const

std::shared_ptr< CommandQueue >	GetCommandQueue () const override
	Return the graphics queue for submitting command buffers. More...

std::shared_ptr< GPUTracerVK >	GetGPUTracer () const

void	RecordFrameEndTime () const

void	InitializeCommonlyUsedShadersIfNeeded () const override

void	DisposeThreadLocalCachedResources () override

bool	GetShouldDisableSurfaceControlSwapchain () const
	Whether the Android Surface control based swapchain should be disabled, even if the device is capable of supporting it. More...

Public Member Functions inherited from impeller::Context
virtual	~Context ()
	Destroys an Impeller context. More...

virtual bool	UpdateOffscreenLayerPixelFormat (PixelFormat format)

virtual void	StoreTaskForGPU (const fml::closure &task, const fml::closure &failure)

Static Public Member Functions
static size_t	ChooseThreadCountForWorkers (size_t hardware_concurrency)

static std::shared_ptr< ContextVK >	Create (Settings settings)

template<typename T >
static bool	SetDebugName (const vk::Device &device, T handle, std::string_view label)

Static Public Member Functions inherited from impeller::BackendCast< ContextVK, Context >
static ContextVK &	Cast (Context &base)

static const ContextVK &	Cast (const Context &base)

static ContextVK *	Cast (Context *base)

static const ContextVK *	Cast (const Context *base)

Additional Inherited Members
Public Types inherited from impeller::Context
enum	BackendType { BackendType::kMetal, BackendType::kOpenGLES, BackendType::kVulkan }

Static Public Attributes inherited from impeller::Context
static constexpr int32_t	kMaxTasksAwaitingGPU = 10

Protected Member Functions inherited from impeller::Context
	Context ()

Protected Attributes inherited from impeller::Context
std::vector< std::function< void()> >	per_frame_task_

Detailed Description

Definition at line 42 of file context_vk.h.

Constructor & Destructor Documentation

◆ ~ContextVK()

impeller::ContextVK::~ContextVK ( )

override

Definition at line 125 of file context_vk.cc.

                       {
   if (device_holder_ && device_holder_->device) {
     [[maybe_unused]] auto result = device_holder_->device->waitIdle();
   }
   CommandPoolRecyclerVK::DestroyThreadLocalPools(this);
 }

References impeller::CommandPoolRecyclerVK::DestroyThreadLocalPools().

Member Function Documentation

◆ ChooseThreadCountForWorkers()

size_t impeller::ContextVK::ChooseThreadCountForWorkers ( size_t hardware_concurrency )

static

Choose the number of worker threads the context_vk will create.

Visible for testing.

Definition at line 108 of file context_vk.cc.

                                                                          {
   // Never create more than 4 worker threads. Attempt to use up to
   // half of the available concurrency.
   return std::clamp(hardware_concurrency / 2ull, /*lo=*/1ull, /*hi=*/4ull);
 }

Referenced by impeller::testing::TEST().

◆ Create()

std::shared_ptr< ContextVK > impeller::ContextVK::Create ( Settings settings )

static

Definition at line 98 of file context_vk.cc.

                                                             {
   auto context = std::shared_ptr<ContextVK>(new ContextVK());
   context->Setup(std::move(settings));
   if (!context->IsValid()) {
     return nullptr;
   }
   return context;
 }

Referenced by impeller::PlaygroundImplVK::PlaygroundImplVK().

◆ CreateCommandBuffer()

std::shared_ptr< CommandBuffer > impeller::ContextVK::CreateCommandBuffer ( ) const

overridevirtual

Create a new command buffer. Command buffers can be used to encode graphics, blit, or compute commands to be submitted to the device.

A command buffer can only be used on a single thread. Multi-threaded render, blit, or compute passes must create a new command buffer on each thread.

Returns: A new command buffer.

Implements impeller::Context.

Definition at line 492 of file context_vk.cc.

                                                                   {
   const auto& recycler = GetCommandPoolRecycler();
   auto tls_pool = recycler->Get();
   if (!tls_pool) {
     return nullptr;
   }
  
   auto tracked_objects = std::make_shared<TrackedObjectsVK>(
       weak_from_this(), std::move(tls_pool), GetGPUTracer()->CreateGPUProbe());
   auto queue = GetGraphicsQueue();
  
   if (!tracked_objects || !tracked_objects->IsValid() || !queue) {
     return nullptr;
   }
  
   vk::CommandBufferBeginInfo begin_info;
   begin_info.flags = vk::CommandBufferUsageFlagBits::eOneTimeSubmit;
   if (tracked_objects->GetCommandBuffer().begin(begin_info) !=
       vk::Result::eSuccess) {
     VALIDATION_LOG << "Could not begin command buffer.";
     return nullptr;
   }
  
   tracked_objects->GetGPUProbe().RecordCmdBufferStart(
       tracked_objects->GetCommandBuffer());
  
   return std::shared_ptr<CommandBufferVK>(new CommandBufferVK(
       shared_from_this(),          //
       GetDeviceHolder(),           //
       std::move(tracked_objects),  //
       GetFenceWaiter()             //
       ));
 }

References GetCommandPoolRecycler(), GetDeviceHolder(), GetFenceWaiter(), GetGPUTracer(), GetGraphicsQueue(), and VALIDATION_LOG.

Referenced by impeller::GPUTracerVK::InitializeQueryPool().

◆ CreateSurfaceContext()

std::shared_ptr< SurfaceContextVK > impeller::ContextVK::CreateSurfaceContext ( )

Definition at line 551 of file context_vk.cc.

                                                                 {
   return std::make_shared<SurfaceContextVK>(shared_from_this());
 }

◆ DescribeGpuModel()

std::string impeller::ContextVK::DescribeGpuModel ( ) const

overridevirtual

Implements impeller::Context.

Definition at line 468 of file context_vk.cc.

                                             {
   return device_name_;
 }

◆ DisposeThreadLocalCachedResources()

void impeller::ContextVK::DisposeThreadLocalCachedResources ( )

overridevirtual

Dispose resources that are cached on behalf of the current thread.

Some backends such as Vulkan may cache resources that can be reused while executing a rendering operation. This API can be called after the operation completes in order to clear the cache.

Reimplemented from impeller::Context.

Definition at line 632 of file context_vk.cc.

                                                   {
   command_pool_recycler_->Dispose();
 }

◆ GetBackendType()

Context::BackendType impeller::ContextVK::GetBackendType ( ) const

overridevirtual

Get the graphics backend of an Impeller context.

        This is useful for cases where a renderer needs to track and
        lookup backend-specific resources, like shaders or uniform
        layout information.

        It's not recommended to use this as a substitute for
        per-backend capability checking. Instead, check for specific
        capabilities via `GetCapabilities()`.

Returns: The graphics backend of the Context.

Implements impeller::Context.

Definition at line 132 of file context_vk.cc.

                                                    {
   return Context::BackendType::kVulkan;
 }

References impeller::Context::kVulkan.

◆ GetCapabilities()

const std::shared_ptr< const Capabilities > & impeller::ContextVK::GetCapabilities ( ) const

overridevirtual

Get the capabilities of Impeller context. All optionally supported feature of the platform, client-rendering API, and device can be queried using the Capabilities.

Returns: The capabilities. Can never be nullptr for a valid context.

Implements impeller::Context.

Definition at line 555 of file context_vk.cc.

                                                                           {
   return device_capabilities_;
 }

Referenced by impeller::AllocatedTextureSourceVK::AllocatedTextureSourceVK().

◆ GetCommandPoolRecycler()

std::shared_ptr< CommandPoolRecyclerVK > impeller::ContextVK::GetCommandPoolRecycler ( ) const

Definition at line 575 of file context_vk.cc.

           {
   return command_pool_recycler_;
 }

Referenced by CreateCommandBuffer().

◆ GetCommandQueue()

std::shared_ptr< CommandQueue > impeller::ContextVK::GetCommandQueue ( ) const

overridevirtual

Return the graphics queue for submitting command buffers.

Implements impeller::Context.

Definition at line 589 of file context_vk.cc.

                                                              {
   return command_queue_vk_;
 }

Referenced by impeller::GPUTracerVK::InitializeQueryPool().

◆ GetConcurrentWorkerTaskRunner()

const std::shared_ptr< fml::ConcurrentTaskRunner > impeller::ContextVK::GetConcurrentWorkerTaskRunner ( ) const

Definition at line 535 of file context_vk.cc.

                                                {
   return raster_message_loop_->GetTaskRunner();
 }

◆ GetDescriptorPoolRecycler()

std::shared_ptr< DescriptorPoolRecyclerVK > impeller::ContextVK::GetDescriptorPoolRecycler ( ) const

Definition at line 584 of file context_vk.cc.

           {
   return descriptor_pool_recycler_;
 }

◆ GetDevice()

const vk::Device & impeller::ContextVK::GetDevice ( ) const

Definition at line 530 of file context_vk.cc.

                                            {
   return device_holder_->device.get();
 }

Referenced by impeller::DescriptorPoolVK::AllocateDescriptorSets(), InitializeCommonlyUsedShadersIfNeeded(), impeller::GPUTracerVK::InitializeQueryPool(), and SetDebugName().

◆ GetDeviceHolder()

std::shared_ptr<DeviceHolderVK> impeller::ContextVK::GetDeviceHolder ( ) const

inline

Definition at line 137 of file context_vk.h.

                                                         {
     return device_holder_;
   }

Referenced by CreateCommandBuffer().

◆ GetDriverInfo()

const std::unique_ptr< DriverInfoVK > & impeller::ContextVK::GetDriverInfo ( ) const

Definition at line 641 of file context_vk.cc.

                                                                   {
   return driver_info_;
 }

◆ GetFenceWaiter()

std::shared_ptr< FenceWaiterVK > impeller::ContextVK::GetFenceWaiter ( ) const

Definition at line 567 of file context_vk.cc.

                                                              {
   return fence_waiter_;
 }

Referenced by CreateCommandBuffer().

◆ GetGPUTracer()

std::shared_ptr< GPUTracerVK > impeller::ContextVK::GetGPUTracer ( ) const

Definition at line 580 of file context_vk.cc.

                                                          {
   return gpu_tracer_;
 }

Referenced by impeller::AHBSwapchainImplVK::AcquireNextDrawable(), and CreateCommandBuffer().

◆ GetGraphicsQueue()

const std::shared_ptr< QueueVK > & impeller::ContextVK::GetGraphicsQueue ( ) const

Definition at line 559 of file context_vk.cc.

                                                                 {
   return queues_.graphics_queue;
 }

References impeller::QueuesVK::graphics_queue.

Referenced by CreateCommandBuffer().

◆ GetHash()

uint64_t impeller::ContextVK::GetHash ( ) const

inline

Definition at line 68 of file context_vk.h.

68 { return hash_; }

Referenced by impeller::CommandPoolRecyclerVK::DestroyThreadLocalPools().

◆ GetInstance()

vk::Instance impeller::ContextVK::GetInstance ( ) const

Definition at line 526 of file context_vk.cc.

                                         {
   return *device_holder_->instance;
 }

◆ GetPhysicalDevice()

vk::PhysicalDevice impeller::ContextVK::GetPhysicalDevice ( ) const

Definition at line 563 of file context_vk.cc.

                                                     {
   return device_holder_->physical_device;
 }

◆ GetPipelineLibrary()

std::shared_ptr< PipelineLibrary > impeller::ContextVK::GetPipelineLibrary ( ) const

overridevirtual

Returns the library of pipelines used by render or compute commands.

Returns: The pipeline library. Can never be nullptr for a valid context.

Implements impeller::Context.

Definition at line 488 of file context_vk.cc.

                                                                    {
   return pipeline_library_;
 }

◆ GetResourceAllocator()

std::shared_ptr< Allocator > impeller::ContextVK::GetResourceAllocator ( ) const

overridevirtual

Returns the allocator used to create textures and buffers on the device.

Returns: The resource allocator. Can never be nullptr for a valid context.

Implements impeller::Context.

Definition at line 476 of file context_vk.cc.

                                                                {
   return allocator_;
 }

Referenced by InitializeCommonlyUsedShadersIfNeeded().

◆ GetResourceManager()

std::shared_ptr< ResourceManagerVK > impeller::ContextVK::GetResourceManager ( ) const

Definition at line 571 of file context_vk.cc.

                                                                      {
   return resource_manager_;
 }

◆ GetSamplerLibrary()

std::shared_ptr< SamplerLibrary > impeller::ContextVK::GetSamplerLibrary ( ) const

overridevirtual

Returns the library of combined image samplers used in shaders.

Returns: The sampler library. Can never be nullptr for a valid context.

Implements impeller::Context.

Definition at line 484 of file context_vk.cc.

                                                                  {
   return sampler_library_;
 }

◆ GetShaderLibrary()

std::shared_ptr< ShaderLibrary > impeller::ContextVK::GetShaderLibrary ( ) const

overridevirtual

Returns the library of shaders used to specify the programmable stages of a pipeline.

Returns: The shader library. Can never be nullptr for a valid context.

Implements impeller::Context.

Definition at line 480 of file context_vk.cc.

                                                                {
   return shader_library_;
 }

◆ GetShouldDisableSurfaceControlSwapchain()

bool impeller::ContextVK::GetShouldDisableSurfaceControlSwapchain ( ) const

Whether the Android Surface control based swapchain should be disabled, even if the device is capable of supporting it.

Definition at line 645 of file context_vk.cc.

                                                               {
   return should_disable_surface_control_;
 }

◆ GetYUVConversionLibrary()

const std::shared_ptr< YUVConversionLibraryVK > & impeller::ContextVK::GetYUVConversionLibrary ( ) const

Definition at line 637 of file context_vk.cc.

                                          {
   return yuv_conversion_library_;
 }

Referenced by impeller::CreateYUVConversion().

◆ InitializeCommonlyUsedShadersIfNeeded()

void impeller::ContextVK::InitializeCommonlyUsedShadersIfNeeded ( ) const

overridevirtual

Run backend specific additional setup and create common shader variants.

This bootstrap is intended to improve the performance of several first frame benchmarks that are tracked in the flutter device lab. The workload includes initializing commonly used but not default shader variants, as well as forcing driver initialization.

Reimplemented from impeller::Context.

Definition at line 596 of file context_vk.cc.

                                                             {
   RenderTargetAllocator rt_allocator(GetResourceAllocator());
   RenderTarget render_target =
       rt_allocator.CreateOffscreenMSAA(*this, {1, 1}, 1);
  
   RenderPassBuilderVK builder;
   for (const auto& [bind_point, color] : render_target.GetColorAttachments()) {
     builder.SetColorAttachment(
         bind_point,                                          //
         color.texture->GetTextureDescriptor().format,        //
         color.texture->GetTextureDescriptor().sample_count,  //
         color.load_action,                                   //
         color.store_action                                   //
     );
   }
  
   if (auto depth = render_target.GetDepthAttachment(); depth.has_value()) {
     builder.SetDepthStencilAttachment(
         depth->texture->GetTextureDescriptor().format,        //
         depth->texture->GetTextureDescriptor().sample_count,  //
         depth->load_action,                                   //
         depth->store_action                                   //
     );
   } else if (auto stencil = render_target.GetStencilAttachment();
              stencil.has_value()) {
     builder.SetStencilAttachment(
         stencil->texture->GetTextureDescriptor().format,        //
         stencil->texture->GetTextureDescriptor().sample_count,  //
         stencil->load_action,                                   //
         stencil->store_action                                   //
     );
   }
  
   auto pass = builder.Build(GetDevice());
 }

References impeller::RenderPassBuilderVK::Build(), color, impeller::RenderTargetAllocator::CreateOffscreenMSAA(), impeller::RenderTarget::GetColorAttachments(), impeller::RenderTarget::GetDepthAttachment(), GetDevice(), GetResourceAllocator(), impeller::RenderTarget::GetStencilAttachment(), impeller::RenderPassBuilderVK::SetColorAttachment(), impeller::RenderPassBuilderVK::SetDepthStencilAttachment(), and impeller::RenderPassBuilderVK::SetStencilAttachment().

◆ IsValid()

bool impeller::ContextVK::IsValid ( ) const

overridevirtual

Determines if a context is valid. If the caller ever receives an invalid context, they must discard it and construct a new context. There is no recovery mechanism to repair a bad context.

It is convention in Impeller to never return an invalid context from a call that returns an pointer to a context. The call implementation performs validity checks itself and return a null context instead of a pointer to an invalid context.

How a context goes invalid is backend specific. It could happen due to device loss, or any other unrecoverable error.

Returns: If the context is valid.

Implements impeller::Context.

Definition at line 472 of file context_vk.cc.

                               {
   return is_valid_;
 }

◆ RecordFrameEndTime()

void impeller::ContextVK::RecordFrameEndTime ( ) const

◆ SetDebugName() [1/2]

template<typename T >

static bool impeller::ContextVK::SetDebugName	(	const vk::Device &	device,
		T	handle,
		std::string_view	label
	)

inlinestatic

Definition at line 114 of file context_vk.h.

                                                  {
     if (!HasValidationLayers()) {
       // No-op if validation layers are not enabled.
       return true;
     }
  
     auto c_handle = static_cast<typename T::CType>(handle);
  
     vk::DebugUtilsObjectNameInfoEXT info;
     info.objectType = T::objectType;
     info.pObjectName = label.data();
     info.objectHandle = reinterpret_cast<decltype(info.objectHandle)>(c_handle);
  
     if (device.setDebugUtilsObjectNameEXT(info) != vk::Result::eSuccess) {
       VALIDATION_LOG << "Unable to set debug name: " << label;
       return false;
     }
  
     return true;
   }

References impeller::HasValidationLayers(), and VALIDATION_LOG.

◆ SetDebugName() [2/2]

template<typename T >

bool impeller::ContextVK::SetDebugName	(	T	handle,
		std::string_view	label
	)		const

inline

Definition at line 109 of file context_vk.h.

                                                           {
     return SetDebugName(GetDevice(), handle, label);
   }

References GetDevice().

Referenced by impeller::CreateCompatRenderPassForPipeline(), impeller::CreateSampler(), and impeller::QueuesVK::QueuesVK().

◆ SetOffscreenFormat()

void impeller::ContextVK::SetOffscreenFormat ( PixelFormat pixel_format )

Definition at line 463 of file context_vk.cc.

                                                            {
   CapabilitiesVK::Cast(*device_capabilities_).SetOffscreenFormat(pixel_format);
 }

References impeller::BackendCast< CapabilitiesVK, Capabilities >::Cast(), and impeller::CapabilitiesVK::SetOffscreenFormat().

◆ Shutdown()

void impeller::ContextVK::Shutdown ( )

overridevirtual

Force all pending asynchronous work to finish. This is achieved by deleting all owned concurrent message loops.

Implements impeller::Context.

Definition at line 539 of file context_vk.cc.

                          {
   // There are multiple objects, for example |CommandPoolVK|, that in their
   // destructors make a strong reference to |ContextVK|. Resetting these shared
   // pointers ensures that cleanup happens in a correct order.
   //
   // tl;dr: Without it, we get thread::join failures on shutdown.
   fence_waiter_.reset();
   resource_manager_.reset();
  
   raster_message_loop_->Terminate();
 }

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

impeller/renderer/backend/vulkan/context_vk.h
impeller/renderer/backend/vulkan/context_vk.cc

Classes

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ~ContextVK()

Member Function Documentation

◆ ChooseThreadCountForWorkers()

◆ Create()

◆ CreateCommandBuffer()

◆ CreateSurfaceContext()

◆ DescribeGpuModel()

◆ DisposeThreadLocalCachedResources()

◆ GetBackendType()

◆ GetCapabilities()

◆ GetCommandPoolRecycler()

◆ GetCommandQueue()

◆ GetConcurrentWorkerTaskRunner()

◆ GetDescriptorPoolRecycler()

◆ GetDevice()

◆ GetDeviceHolder()

◆ GetDriverInfo()

◆ GetFenceWaiter()

◆ GetGPUTracer()

◆ GetGraphicsQueue()

◆ GetHash()

◆ GetInstance()

◆ GetPhysicalDevice()

◆ GetPipelineLibrary()

◆ GetResourceAllocator()

◆ GetResourceManager()

◆ GetSamplerLibrary()

◆ GetShaderLibrary()

◆ GetShouldDisableSurfaceControlSwapchain()

◆ GetYUVConversionLibrary()

◆ InitializeCommonlyUsedShadersIfNeeded()

◆ IsValid()

◆ RecordFrameEndTime()

◆ SetDebugName() [1/2]

◆ SetDebugName() [2/2]

◆ SetOffscreenFormat()

◆ Shutdown()