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1 files changed, 77 insertions, 0 deletions

diff --git a/lib/stopwatch.h b/lib/stopwatch.h
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+// StopWatch.h
+// Stopwatch class for high resolution timing.
+// Code by Richard S. Wright Jr.
+// March 23, 1999
+// 
+// This function uses the High performance counter on Win32 and
+// gettimeofday on Mac OS X/Linux. gettimeofday is actually pretty
+// good on the Mac (about 10ms).
+
+#ifndef STOPWATCH_HEADER
+#define STOPWATCH_HEADER
+
+#ifdef WIN32
+#include <windows.h>
+#else
+#include <sys/time.h>
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
+// Simple Stopwatch class. Use this for high resolution timing 
+// purposes (or, even low resolution timings)
+// Pretty self-explanitory.... 
+// Reset(), or GetElapsedSeconds().
+class CStopWatch
+{
+    public:
+        CStopWatch(void)
+        {
+            #ifdef WIN32
+            QueryPerformanceFrequency(&m_CounterFrequency);
+            QueryPerformanceCounter(&m_LastCount);
+            #else
+            gettimeofday(&m_LastCount, 0);
+            #endif
+        }
+
+        // Resets timer (difference) to zero
+        inline void Reset(void) 
+        {
+            #ifdef WIN32
+            QueryPerformanceCounter(&m_LastCount);
+            #else
+            gettimeofday(&m_LastCount, 0);
+            #endif
+        }                    
+        
+        // Get elapsed time in seconds
+        float GetElapsedSeconds(void)
+        {
+            // Get the current count
+            #ifdef WIN32
+            LARGE_INTEGER lCurrent;
+            QueryPerformanceCounter(&lCurrent);
+
+            return float((lCurrent.QuadPart - m_LastCount.QuadPart) /
+                                        double(m_CounterFrequency.QuadPart));
+            #else
+            timeval lcurrent;
+            gettimeofday(&lcurrent, 0);
+            float fSeconds = (float)(lcurrent.tv_sec - m_LastCount.tv_sec);
+            float fFraction = (float)(lcurrent.tv_usec - m_LastCount.tv_usec) * 0.000001f;
+            return fSeconds + fFraction;
+            #endif
+        }    
+    
+    protected:
+    #ifdef WIN32
+        LARGE_INTEGER m_CounterFrequency;
+        LARGE_INTEGER m_LastCount;
+    #else
+        timeval m_LastCount;
+    #endif
+};
+
+
+#endif
+