137 lines
3.0 KiB
C
137 lines
3.0 KiB
C
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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#ifndef PERFCOUNTER_H
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#define PERFCOUNTER_H
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// System headers
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//
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#include <algorithm>
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#include <array>
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#include <chrono>
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#include <map>
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#include <mutex>
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#include <numeric>
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#include <ratio>
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// Library headers
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//
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#include "k4aimgui_all.h"
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// Project headers
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//
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namespace k4aviewer
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{
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// Rudimentary performance counter for tracking down performance problems.
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//
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// Perf counters must last forever once declared (usually by being declared static).
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//
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class PerfCounter;
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class PerfCounterManager
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{
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public:
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static void RegisterPerfCounter(const char *name, PerfCounter *perfCounter);
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static void ShowPerfWindow(bool *windowOpen);
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private:
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static PerfCounterManager &Instance();
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std::map<std::string, PerfCounter *> m_perfCounters;
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std::mutex m_mutex;
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};
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// A wrapper for taking a single perf measurement. Timing starts when the sample is created.
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//
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struct PerfSample
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{
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inline PerfSample(PerfCounter *counter) :
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m_counter(counter),
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m_currentSampleStart(std::chrono::high_resolution_clock::now())
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{
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}
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// End the sample early
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//
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inline void End();
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inline ~PerfSample()
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{
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End();
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}
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private:
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PerfCounter *m_counter;
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std::chrono::high_resolution_clock::time_point m_currentSampleStart;
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};
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class PerfCounter
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{
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public:
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using SampleData = std::array<float, 100>;
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PerfCounter(const char *name)
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{
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PerfCounterManager::RegisterPerfCounter(name, this);
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}
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PerfCounter(const std::string &name) : PerfCounter(name.c_str()) {}
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inline float GetMax() const
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{
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return m_max;
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}
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inline float GetAverage() const
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{
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return static_cast<float>(std::accumulate(m_samples.begin(), m_samples.end(), 0.0) / m_samples.size());
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}
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inline const SampleData &GetSampleData() const
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{
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return m_samples;
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}
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inline size_t GetCurrentSampleId() const
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{
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return m_currentSample;
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}
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inline void EndSample(std::chrono::high_resolution_clock::time_point startTime)
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{
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const auto endTime = std::chrono::high_resolution_clock::now();
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const long long durationNs = std::chrono::duration_cast<std::chrono::nanoseconds>(endTime - startTime).count();
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const float durationMs = durationNs * 1.0f * std::milli::den / std::milli::num * std::nano::num /
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std::nano::den;
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m_max = std::max(m_max, durationMs);
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m_currentSample = (m_currentSample + 1) % m_samples.size();
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m_samples[m_currentSample] = durationMs;
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}
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inline void Reset()
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{
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m_max = 0;
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std::fill(m_samples.begin(), m_samples.end(), 0.0f);
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}
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private:
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float m_max = 0;
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size_t m_currentSample = 0;
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SampleData m_samples;
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};
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inline void PerfSample::End()
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{
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if (m_counter)
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{
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m_counter->EndSample(m_currentSampleStart);
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m_counter = nullptr;
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}
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}
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} // namespace k4aviewer
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#endif
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