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CryNetwork/PingCalculator.h

@@ -0,0 +1,100 @@
+//////////////////////////////////////////////////////////////////////
+//
+//  Game Source Code
+//
+//  File: PingCalculator.h
+//  Description: Latency(Ping) calculator
+//
+//  History:
+//  - August 10, 2001: Created by Alberto Demichelis
+//
+//////////////////////////////////////////////////////////////////////
+
+
+#ifndef _PING_CALCULATOR_H_
+#define _PING_CALCULATOR_H_
+
+#if _MSC_VER > 1000
+#pragma once
+#endif // _MSC_VER > 1000
+
+#define NUM_OF_SAMPLES 10
+#define DIV_MULTIPLIER (1.0/NUM_OF_SAMPLES)
+#define INC_INDEX(a) (a) = ((++a)%NUM_OF_SAMPLES)
+#define PING_RATE 500
+
+class CPingCalculator  
+{
+public:
+	CPingCalculator()
+	{
+		m_nSampleIndex = 0;
+		m_nLastSample = 0;
+		m_bSyncronized = false;
+		m_nRemoteTimestamp = 0;
+		memset(m_fSample, 0, sizeof(m_fSample));
+		m_fPing=100;
+	}
+	float GetAverageLatency()
+	{
+		float fSum = 0;
+		
+		// return (fSum*(DIV_MULTIPLIER));
+		return m_fPing;
+	}
+	bool IsTimeToPing(unsigned int nCurrentTime)
+	{
+		if ((nCurrentTime - m_nLastSample)>PING_RATE)
+		{
+			m_nLastSample = nCurrentTime;
+			return true;
+		}
+		return false;
+	}
+	void AddSample(float f,unsigned int nLocalTimestamp,unsigned int nRemoteTimestamp)
+	{
+		float fSum = 0;
+		float fTemp[NUM_OF_SAMPLES];
+
+		m_fSample[m_nSampleIndex] = f*0.5f;
+		memcpy(fTemp, m_fSample, sizeof(fTemp));
+		qsort(fTemp, NUM_OF_SAMPLES, sizeof(float), CPingCalculator::Compare);
+		
+		m_fPing = fTemp[NUM_OF_SAMPLES/2];
+		
+		INC_INDEX(m_nSampleIndex);
+		NET_TRACE("PING %04d\n", LONG(m_fPing));
+		m_nRemoteTimestamp=(unsigned int)(nRemoteTimestamp-m_fPing);
+		m_nLocalTimestamp=nLocalTimestamp;
+	}
+	unsigned int GetCurrentRemoteTimestamp(unsigned int nLocalTimestamp){
+		unsigned int nCurrentDelta=m_nLocalTimestamp-nLocalTimestamp;
+		return m_nRemoteTimestamp+nCurrentDelta;
+	}
+	unsigned int GetPacketLatency(unsigned int nLocalTimestamp,unsigned int nPacketTimestamp){
+			unsigned int nRemote=GetCurrentRemoteTimestamp(nLocalTimestamp);
+			return nPacketTimestamp-nRemote;
+	}
+	static int __cdecl Compare(const void *arg1, const void *arg2)
+	{
+		float f = ((*(float *)arg1 - (*(float *)arg2)));
+		if (f>0)
+			return 1; // greater
+		if (f < 0)
+			return -1; // less
+		return 0; // equel
+	}
+private:
+	float m_fSample[NUM_OF_SAMPLES];
+	//! middle value of all samples
+	float m_fPing;
+	unsigned int m_nSampleIndex;
+	unsigned int m_nLastSample;
+	bool m_bSyncronized;
+	//! average remote timestamp
+	unsigned int m_nRemoteTimestamp;
+	//! local timestamp
+	unsigned int m_nLocalTimestamp;
+};
+
+#endif // _PING_CALCULATOR_H_