62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include <Windows/WindowsPlatformTime.h>
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namespace UE::StylusInput::Wintab
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{
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class FPacketStats
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{
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public:
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void NewPacket(uint32 SerialNumber)
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{
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const uint64 Timestamp = FPlatformTime::Cycles64();
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if (LatestTimestamp - EarliestTimestamp >= CyclesPerSecond)
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{
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PacketsPerSecond = EarliestTimestamp != LatestTimestamp ? NumPackets / ((LatestTimestamp - EarliestTimestamp) / CyclesPerSecond) : 0.0f;
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EarliestTimestamp = Timestamp;
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NumPackets = -1;
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}
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LatestTimestamp = Timestamp;
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NumLostPackets += SerialNumber > LatestSerialNumber ? SerialNumber - LatestSerialNumber - 1 : 0;
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LatestSerialNumber = SerialNumber;
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++NumPackets;
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}
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void InvalidPacket()
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{
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++NumInvalidPackets;
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}
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float GetPacketsPerSecond() const
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{
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const uint64 Timestamp = FPlatformTime::Cycles64();
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return Timestamp - LatestTimestamp <= CyclesPerSecond ? PacketsPerSecond : 0.0f;
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}
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uint32 GetNumInvalidPackets() const
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{
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return NumInvalidPackets;
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}
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uint32 GetNumLostPackets() const
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{
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return NumLostPackets;
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}
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private:
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uint64 EarliestTimestamp = 0;
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uint64 LatestTimestamp = 0;
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uint32 LatestSerialNumber = -1;
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uint32 NumPackets = 0;
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uint32 NumInvalidPackets = 0;
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uint32 NumLostPackets = 0;
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float PacketsPerSecond = 0.0f;
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const double CyclesPerSecond = 1.0 / FPlatformTime::GetSecondsPerCycle64();
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};
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}
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