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CDXAddons/CDXHPC/cdxhpc.cpp

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+/////////////////////////////////////////////////////////////////////
+// Project Name:   [ CDX Class Library - CDX.lib ]
+// Source File:    [ CDX High Performance Counter Implementation]
+// Author:         [ Bil Simser - [email protected] ]
+// Contributions:  [ Michael Rich, Jimb Esser ]
+// Revision:       [ 2.0 ]
+/////////////////////////////////////////////////////////////////////
+
+#include "cdxhpc.h"
+
+
+/////////////////////////////////////////////////////////////////////
+// constructor
+/////////////////////////////////////////////////////////////////////
+CDXHPC::CDXHPC()
+{
+	// init to zero
+	freq.QuadPart = 0;
+	restart.QuadPart = 0;
+	bPaused = FALSE;
+}
+
+/////////////////////////////////////////////////////////////////////
+// starts the counter
+/////////////////////////////////////////////////////////////////////
+BOOL CDXHPC::Start()
+{
+	QueryPerformanceCounter(&restart);
+	if (!QueryPerformanceFrequency(&freq)) return FALSE;
+	// convert it down to milliseconds
+	freq.QuadPart /= 1000;
+	return TRUE;
+}
+
+/////////////////////////////////////////////////////////////////////
+// returns the current # of ms since counter was started
+/////////////////////////////////////////////////////////////////////
+DWORD CDXHPC::GetValue()
+{
+	if (bPaused)
+		return (DWORD)((paused.QuadPart - restart.QuadPart) / freq.QuadPart);
+    LARGE_INTEGER timer;
+    QueryPerformanceCounter(&timer);
+    return (DWORD)((timer.QuadPart - restart.QuadPart) / freq.QuadPart);
+}
+
+/////////////////////////////////////////////////////////////////////
+// waits for a specified ms since the counter was started
+// note that if its already been that long since it was started
+// the function would exit immediately
+/////////////////////////////////////////////////////////////////////
+void CDXHPC::Wait(DWORD dwMilliSecs)
+{
+    while (TRUE)
+	{
+		if (GetValue()>=dwMilliSecs) break;
+	}
+}
+
+/////////////////////////////////////////////////////////////////////
+// waits for a specified ms after the function is called
+/////////////////////////////////////////////////////////////////////
+void CDXHPC::WaitFor(DWORD dwWaitTime)
+{
+	DWORD dwStart = GetValue();
+	while (TRUE)
+	{
+		if (GetValue() - dwStart >= dwWaitTime) break;
+	}
+}
+
+
+/////////////////////////////////////////////////////////////////////
+// resets the counter back to zero
+/////////////////////////////////////////////////////////////////////
+void CDXHPC::Reset()
+{
+    LARGE_INTEGER timer, excess;
+    QueryPerformanceCounter(&timer);
+    excess.QuadPart = (timer.QuadPart - restart.QuadPart) % freq.QuadPart;
+    QueryPerformanceCounter(&restart);
+    restart.QuadPart -= excess.QuadPart;
+}
+
+void CDXHPC::Pause()
+{
+	if (!bPaused) {
+		QueryPerformanceCounter(&paused);
+		bPaused = TRUE;
+	}
+}
+
+void CDXHPC::Resume()
+{
+	if (bPaused) {
+		LARGE_INTEGER timer;
+		QueryPerformanceCounter(&timer);
+		restart.QuadPart += timer.QuadPart - paused.QuadPart;
+		bPaused = FALSE;
+	}
+}

CDXAddons/CDXHPC/cdxhpc.h

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+// CDXHPC class, with additional functions - Pause and Resume added by Jimb Esser
+
+#ifndef _H_CDXHPC
+#define _H_CDXHPC
+
+#define WIN32_EXTRA_LEAN
+#include <windows.h>
+
+class CDXHPC
+{
+public:
+	// constructor
+	CDXHPC();
+	// destructor
+	virtual ~CDXHPC() {};
+
+	// starts the counter
+	BOOL Start();
+	// returns the current # of ms since counter was started
+	DWORD GetValue();
+	// waits for a specified ms since the counter was started
+	// note that if its already been that long since it was started
+	// the function would exit immediately
+	void Wait(DWORD dwStopTime);
+	// waits for a specified ms after the function is called
+	void WaitFor(DWORD dwWaitTime);
+
+	// resets the counter back to zero
+	void Reset();
+
+	void Pause();
+	void Resume();
+
+protected:
+	// counter variables
+	LARGE_INTEGER freq, restart, paused;
+	BOOL bPaused;
+};
+
+#endif		/* #ifndef _H_CDXHPC */