From b59c904836b6e0b0a2963e588df83cf892e85e2a Mon Sep 17 00:00:00 2001
From: RD42 <42702181+dashr9230@users.noreply.github.com>
Date: Wed, 24 Apr 2024 22:42:10 +0800
Subject: [PATCH] [server] Implement `GetElapsedTime()`

* Update `CNetGame::Process()`
---
 server/netgame.cpp | 63 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/server/netgame.cpp b/server/netgame.cpp
index 4bac454..90f426d 100644
--- a/server/netgame.cpp
+++ b/server/netgame.cpp
@@ -465,8 +465,71 @@ void CNetGame::ShutdownForGameModeRestart()
 */
 }
 
+//----------------------------------------------------
+
+#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()
 {
+	float fElapsedTime = GetElapsedTime();
+
+
 	// TODO: CNetGame::Process W: 00491240 L: 080AEEE0
 
 /*