impeller::GPUTracerVK Class Reference

A class that uses timestamp queries to record the approximate GPU execution time. More...

#include <gpu_tracer_vk.h>

Inheritance diagram for impeller::GPUTracerVK:

Public Member Functions
	GPUTracerVK (const std::shared_ptr< DeviceHolder > &device_holder)
	~GPUTracerVK ()=default
std::unique_ptr< GPUProbe >	CreateGPUProbe ()
	Create a GPUProbe to trace the execution of a command buffer on the GPU. More...
void	MarkFrameStart ()
	Signal the start of a frame workload. More...
void	MarkFrameEnd ()
	Signal the end of a frame workload. More...
bool	IsEnabled () const

Friends
class	GPUProbe

Detailed Description

A class that uses timestamp queries to record the approximate GPU execution time.

Definition at line 18 of file gpu_tracer_vk.h.

Constructor & Destructor Documentation

GPUTracerVK()

impeller::GPUTracerVK::GPUTracerVK ( const std::shared_ptr< DeviceHolder > &  device_holder )

explicit

Definition at line 21 of file gpu_tracer_vk.cc.

    : device_holder_(device_holder) {
  timestamp_period_ = device_holder_->GetPhysicalDevice()
                          .getProperties()
                          .limits.timestampPeriod;
  if (timestamp_period_ <= 0) {
    // The device does not support timestamp queries.
    return;
  }
  // Disable tracing in release mode.
#ifdef IMPELLER_DEBUG
  enabled_ = true;
#endif
}

~GPUTracerVK()

impeller::GPUTracerVK::~GPUTracerVK ( )

default

Member Function Documentation

CreateGPUProbe()

std::unique_ptr< GPUProbe > impeller::GPUTracerVK::CreateGPUProbe

(

)

Create a GPUProbe to trace the execution of a command buffer on the GPU.

Definition at line 67 of file gpu_tracer_vk.cc.

                                                    {
  return std::make_unique<GPUProbe>(weak_from_this());
}

IsEnabled()

bool impeller::GPUTracerVK::IsEnabled

(

)

const

Definition at line 36 of file gpu_tracer_vk.cc.

                                  {
  return enabled_;
}

MarkFrameEnd()

void impeller::GPUTracerVK::MarkFrameEnd

(

)

Signal the end of a frame workload.

Definition at line 46 of file gpu_tracer_vk.cc.

                               {
  if (!enabled_) {
    return;
  }
 
  Lock lock(trace_state_mutex_);
  current_state_ = (current_state_ + 1) % kTraceStatesSize;
 
  auto& state = trace_states_[current_state_];
  // If there are still pending buffers on the trace state we're switching to,
  // that means that a cmd buffer we were relying on to signal this likely
  // never finished. This shouldn't happen unless there is a bug in the
  // encoder logic. We set it to zero anyway to prevent a validation error
  // from becoming a memory leak.
  FML_DCHECK(state.pending_buffers == 0u);
 
  state.pending_buffers = 0;
  state.current_index = 0;
  in_frame_ = false;
}

MarkFrameStart()

void impeller::GPUTracerVK::MarkFrameStart

(

)

Signal the start of a frame workload.

   Any cmd buffers that are created after this call and before
   [MarkFrameEnd] will be attributed to the current frame. 

Definition at line 40 of file gpu_tracer_vk.cc.

                                 {
  FML_DCHECK(!in_frame_);
  in_frame_ = true;
  raster_thread_id_ = std::this_thread::get_id();
}

Friends And Related Function Documentation

GPUProbe

friend class GPUProbe

friend

Definition at line 41 of file gpu_tracer_vk.h.

---

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

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