[bot] Implement GetElapsedTime()

bot/net/netgame.cpp

@@ -114,6 +114,62 @@ void CNetGame::Init(PCHAR szHostOrIp, int iPort,
 
 //----------------------------------------------------
 
+#ifdef WIN32
+
+#pragma comment(lib, "winmm.lib")
+float GetElapsedTime()
+{
+	static BOOL bTimerInit = false;
+	static BOOL bUsingOPF  = false;
+	static LONGLONG nTicksPerSec = 0;
+
+	if (!bTimerInit)
+	{
+		bTimerInit = true;
+		LARGE_INTEGER qwTicksPerSec;
+		bUsingOPF = QueryPerformanceFrequency(&qwTicksPerSec);
+		if (bUsingOPF) nTicksPerSec = qwTicksPerSec.QuadPart;
+	}
+
+	if (bUsingOPF)
+	{
+		LARGE_INTEGER qwTime;
+		QueryPerformanceCounter(&qwTime);
+		static LONGLONG llLastTime = qwTime.QuadPart;
+		double fElapsedTime = (double)(qwTime.QuadPart - llLastTime) / (double) nTicksPerSec;
+		llLastTime = qwTime.QuadPart;
+		return (float)fElapsedTime;
+	} else {
+		double fTime = timeGetTime() * 0.001;
+		static double fLastTime = fTime;
+		double fElapsedTime = (double)(fTime - fLastTime);
+		fLastTime = fTime;
+		return (float)fElapsedTime;
+	}
+}
+
+#else
+
+float GetElapsedTime()
+{
+	static timeval lasttv;
+	timeval tv;
+	float fRet;
+
+    gettimeofday(&tv, NULL);
+
+	if (!timerisset(&lasttv)) memcpy(&lasttv, &tv, sizeof(timeval));
+
+	fRet = (float)((tv.tv_sec - lasttv.tv_sec) * 1000000) + (tv.tv_usec - lasttv.tv_usec);
+	fRet /= 1000000.0f;
+	
+	memcpy(&lasttv,&tv,sizeof(timeval));
+
+    return fRet;
+}
+
+#endif // WIN32
+
 //----------------------------------------------------
 
 void CNetGame::Process()