PerformanceMonitor.h

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef VRB_PERFORMANCE_MONITOR_DOT_H

#define VRB_PERFORMANCE_MONITOR_DOT_H

#include "vrb/Forward.h"

#include "vrb/MacroUtils.h"

#include "vrb/Updatable.h"

#include <string>

#include <memory>

namespace vrb {

class PerformanceMonitorObserver {

public:

  virtual void PoorPerformanceDetected(const double& aTargetFrameRate, const double& aAverageFrameRate) = 0;

  virtual void PerformanceRestored(const double& aTargetFrameRate, const double& aAverageFrameRate) = 0;

protected:

  explicit PerformanceMonitorObserver() = default;

  ~PerformanceMonitorObserver() = default;

  VRB_NO_DEFAULTS(PerformanceMonitorObserver)

  VRB_NO_NEW_DELETE

};

class PerformanceMonitor : protected Updatable {

public:

  static PerformanceMonitorPtr Create(CreationContextPtr& aContext);

  double GetAverageFrameRate() const;

  double GetPerfomranceDelta() const;

  void SetPerformanceDelta(const double aDelta);

  void Pause();

  void Resume();

  void Resample();

  void AddPerformanceMonitorObserver(PerformanceMonitorObserverPtr aObserver);

  void RemovePerformanceMonitorObserver(const PerformanceMonitorObserver& aObserver);

protected:

  struct State;

  PerformanceMonitor(State& aState, CreationContextPtr& aContext);

  ~PerformanceMonitor() = default;

  // Updatable interface

  void UpdateResource(RenderContext& aContext) override;

private:

  VRB_NO_DEFAULTS(PerformanceMonitor)

  State& m;

};

class PausePerformanceMonitor {

private:

  PerformanceMonitor& mMonitor;

  VRB_NO_DEFAULTS(PausePerformanceMonitor)

  PausePerformanceMonitor() = delete;

public:

  PausePerformanceMonitor(PerformanceMonitor& aMonitor) : mMonitor(aMonitor) {

    mMonitor.Pause();

  ~PausePerformanceMonitor() {

    mMonitor.Resume();

};

#endif // VRB_PERFORMANCE_MONITOR_DOT_H