#include <context_mtl.h>

Inheritance diagram for impeller::ContextMTL:

Public Member Functions
	~ContextMTL () override

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

id< MTLDevice >	GetMTLDevice () const

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...

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

void	SetCapabilities (const std::shared_ptr< const Capabilities > &capabilities)

bool	UpdateOffscreenLayerPixelFormat (PixelFormat format) override

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

id< MTLCommandBuffer >	CreateMTLCommandBuffer (const std::string &label) const

std::shared_ptr< const fml::SyncSwitch >	GetIsGpuDisabledSyncSwitch () const

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

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

virtual void	InitializeCommonlyUsedShadersIfNeeded () const

virtual void	DisposeThreadLocalCachedResources ()

Static Public Member Functions
static std::shared_ptr< ContextMTL >	Create (const std::vector< std::string > &shader_library_paths, std::shared_ptr< const fml::SyncSwitch > is_gpu_disabled_sync_switch)

static std::shared_ptr< ContextMTL >	Create (const std::vector< std::shared_ptr< fml::Mapping >> &shader_libraries_data, std::shared_ptr< const fml::SyncSwitch > is_gpu_disabled_sync_switch, const std::string &label, std::optional< PixelFormat > pixel_format_override=std::nullopt)

static std::shared_ptr< ContextMTL >	Create (id< MTLDevice > device, id< MTLCommandQueue > command_queue, const std::vector< std::shared_ptr< fml::Mapping >> &shader_libraries_data, std::shared_ptr< const fml::SyncSwitch > is_gpu_disabled_sync_switch, const std::string &label)

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

static const ContextMTL &	Cast (const Context &base)

static ContextMTL *	Cast (Context *base)

static const ContextMTL *	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 65 of file context_mtl.h.

Constructor & Destructor Documentation

◆ ~ContextMTL()

impeller::ContextMTL::~ContextMTL ( )

override

Definition at line 284 of file context_mtl.mm.

                         {
   is_gpu_disabled_sync_switch_->RemoveObserver(sync_switch_observer_.get());
 }

Member Function Documentation

◆ Create() [1/3]

std::shared_ptr< ContextMTL > impeller::ContextMTL::Create	(	const std::vector< std::shared_ptr< fml::Mapping >> &	shader_libraries_data,
		std::shared_ptr< const fml::SyncSwitch >	is_gpu_disabled_sync_switch,
		const std::string &	label,
		std::optional< PixelFormat >	pixel_format_override = `std::nullopt`
	)

static

Definition at line 244 of file context_mtl.mm.

                                                     {
   auto device = CreateMetalDevice();
   auto command_queue = CreateMetalCommandQueue(device);
   if (!command_queue) {
     return nullptr;
   }
   auto context = std::shared_ptr<ContextMTL>(new ContextMTL(
       device, command_queue,
       MTLShaderLibraryFromFileData(device, shader_libraries_data,
                                    library_label),
       std::move(is_gpu_disabled_sync_switch), pixel_format_override));
   if (!context->IsValid()) {
     FML_LOG(ERROR) << "Could not create Metal context.";
     return nullptr;
   }
   return context;
 }

References impeller::CreateMetalCommandQueue(), impeller::CreateMetalDevice(), and impeller::MTLShaderLibraryFromFileData().

◆ Create() [2/3]

std::shared_ptr< ContextMTL > impeller::ContextMTL::Create	(	const std::vector< std::string > &	shader_library_paths,
		std::shared_ptr< const fml::SyncSwitch >	is_gpu_disabled_sync_switch
	)

static

Definition at line 225 of file context_mtl.mm.

                                                                     {
   auto device = CreateMetalDevice();
   auto command_queue = CreateMetalCommandQueue(device);
   if (!command_queue) {
     return nullptr;
   }
   auto context = std::shared_ptr<ContextMTL>(new ContextMTL(
       device, command_queue,
       MTLShaderLibraryFromFilePaths(device, shader_library_paths),
       std::move(is_gpu_disabled_sync_switch)));
   if (!context->IsValid()) {
     FML_LOG(ERROR) << "Could not create Metal context.";
     return nullptr;
   }
   return context;
 }

References impeller::CreateMetalCommandQueue(), impeller::CreateMetalDevice(), and impeller::MTLShaderLibraryFromFilePaths().

◆ Create() [3/3]

std::shared_ptr< ContextMTL > impeller::ContextMTL::Create	(	id< MTLDevice >	device,
		id< MTLCommandQueue >	command_queue,
		const std::vector< std::shared_ptr< fml::Mapping >> &	shader_libraries_data,
		std::shared_ptr< const fml::SyncSwitch >	is_gpu_disabled_sync_switch,
		const std::string &	label
	)

static

Definition at line 266 of file context_mtl.mm.

                                     {
   auto context = std::shared_ptr<ContextMTL>(
       new ContextMTL(device, command_queue,
                      MTLShaderLibraryFromFileData(device, shader_libraries_data,
                                                   library_label),
                      std::move(is_gpu_disabled_sync_switch)));
   if (!context->IsValid()) {
     FML_LOG(ERROR) << "Could not create Metal context.";
     return nullptr;
   }
   return context;
 }

References impeller::MTLShaderLibraryFromFileData().

◆ CreateCommandBuffer()

std::shared_ptr< CommandBuffer > impeller::ContextMTL::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 318 of file context_mtl.mm.

                                                                    {
   return CreateCommandBufferInQueue(command_queue_);
 }

Referenced by impeller::SurfaceMTL::PreparePresent().

◆ CreateMTLCommandBuffer()

id< MTLCommandBuffer > impeller::ContextMTL::CreateMTLCommandBuffer ( const std::string & label ) const

Definition at line 373 of file context_mtl.mm.

                                   {
   auto buffer = [command_queue_ commandBuffer];
   if (!label.empty()) {
     [buffer setLabel:@(label.data())];
   }
   return buffer;
 }

Referenced by impeller::SurfaceMTL::Present().

◆ DescribeGpuModel()

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

overridevirtual

Implements impeller::Context.

Definition at line 293 of file context_mtl.mm.

                                              {
   return std::string([[device_ name] UTF8String]);
 }

◆ GetBackendType()

Context::BackendType impeller::ContextMTL::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 288 of file context_mtl.mm.

                                                     {
   return Context::BackendType::kMetal;
 }

◆ GetCapabilities()

const std::shared_ptr< const Capabilities > & impeller::ContextMTL::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 358 of file context_mtl.mm.

                                                                            {
   return device_capabilities_;
 }

◆ GetCommandQueue()

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

overridevirtual

Return the graphics queue for submitting command buffers.

Implements impeller::Context.

Definition at line 429 of file context_mtl.mm.

                                                               {
   return command_queue_ip_;
 }

◆ GetIsGpuDisabledSyncSwitch()

std::shared_ptr< const fml::SyncSwitch > impeller::ContextMTL::GetIsGpuDisabledSyncSwitch ( ) const

Definition at line 331 of file context_mtl.mm.

           {
   return is_gpu_disabled_sync_switch_;
 }

◆ GetMTLDevice()

id< MTLDevice > impeller::ContextMTL::GetMTLDevice ( ) const

Definition at line 354 of file context_mtl.mm.

                                              {
   return device_;
 }

◆ GetPipelineLibrary()

std::shared_ptr< PipelineLibrary > impeller::ContextMTL::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 308 of file context_mtl.mm.

                                                                     {
   return pipeline_library_;
 }

◆ GetResourceAllocator()

std::shared_ptr< Allocator > impeller::ContextMTL::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 350 of file context_mtl.mm.

                                                                 {
   return resource_allocator_;
 }

◆ GetSamplerLibrary()

std::shared_ptr< SamplerLibrary > impeller::ContextMTL::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 313 of file context_mtl.mm.

                                                                   {
   return sampler_library_;
 }

◆ GetShaderLibrary()

std::shared_ptr< ShaderLibrary > impeller::ContextMTL::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 303 of file context_mtl.mm.

                                                                 {
   return shader_library_;
 }

◆ IsValid()

bool impeller::ContextMTL::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 298 of file context_mtl.mm.

                                {
   return is_valid_;
 }

◆ SetCapabilities()

void impeller::ContextMTL::SetCapabilities ( const std::shared_ptr< const Capabilities > & capabilities )

Definition at line 362 of file context_mtl.mm.

                                                            {
   device_capabilities_ = capabilities;
 }

◆ Shutdown()

void impeller::ContextMTL::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 323 of file context_mtl.mm.

323 {}

◆ StoreTaskForGPU()

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

overridevirtual

Stores a task on the ContextMTL that is awaiting access for the GPU.

The task will be executed in the event that the GPU access has changed to being available or that the task has been canceled. The task should operate with the SyncSwitch to make sure the GPU is accessible.

If the queue of pending tasks is cleared without GPU access, then the failure callback will be invoked and the primary task function will not

Threadsafe.

task will be executed on the platform thread.

Reimplemented from impeller::Context.

Definition at line 382 of file context_mtl.mm.

                                                             {
   std::vector<PendingTasks> failed_tasks;
   {
     Lock lock(tasks_awaiting_gpu_mutex_);
     tasks_awaiting_gpu_.push_back(PendingTasks{task, failure});
     int32_t failed_task_count =
         tasks_awaiting_gpu_.size() - kMaxTasksAwaitingGPU;
     if (failed_task_count > 0) {
       failed_tasks.reserve(failed_task_count);
       failed_tasks.insert(failed_tasks.end(),
                           std::make_move_iterator(tasks_awaiting_gpu_.begin()),
                           std::make_move_iterator(tasks_awaiting_gpu_.begin() +
                                                   failed_task_count));
       tasks_awaiting_gpu_.erase(
           tasks_awaiting_gpu_.begin(),
           tasks_awaiting_gpu_.begin() + failed_task_count);
     }
   }
   for (const PendingTasks& task : failed_tasks) {
     if (task.failure) {
       task.failure();
     }
   }
 }

◆ UpdateOffscreenLayerPixelFormat()

bool impeller::ContextMTL::UpdateOffscreenLayerPixelFormat ( PixelFormat format )

overridevirtual

Reimplemented from impeller::Context.

Definition at line 368 of file context_mtl.mm.

                                                                    {
   device_capabilities_ = InferMetalCapabilities(device_, format);
   return true;
 }

References impeller::InferMetalCapabilities().

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

impeller/renderer/backend/metal/context_mtl.h
impeller/renderer/backend/metal/context_mtl.mm

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ~ContextMTL()

Member Function Documentation

◆ Create() [1/3]

◆ Create() [2/3]

◆ Create() [3/3]

◆ CreateCommandBuffer()

◆ CreateMTLCommandBuffer()

◆ DescribeGpuModel()

◆ GetBackendType()

◆ GetCapabilities()

◆ GetCommandQueue()

◆ GetIsGpuDisabledSyncSwitch()

◆ GetMTLDevice()

◆ GetPipelineLibrary()

◆ GetResourceAllocator()

◆ GetSamplerLibrary()

◆ GetShaderLibrary()

◆ IsValid()

◆ SetCapabilities()

◆ Shutdown()

◆ StoreTaskForGPU()

◆ UpdateOffscreenLayerPixelFormat()