Add a QPF timer.

src/nvcore/Timer.h

@@ -1,22 +1,60 @@
-// This code is in the public domain -- castano@gmail.com
-
-#ifndef NV_CORE_TIMER_H
-#define NV_CORE_TIMER_H
-
-#include <nvcore/nvcore.h>
-
-#include <time.h> //clock
-
-class NVCORE_CLASS Timer
-{
-public:
-	Timer() {}
-	
-	void start() { m_start = clock(); }
-	int elapsed() const { return (1000 * (clock() - m_start)) / CLOCKS_PER_SEC; }
-	
-private:
-	clock_t m_start;
-};
-
-#endif // NV_CORE_TIMER_H
+// This code is in the public domain -- castano@gmail.com
+
+#ifndef NV_CORE_TIMER_H
+#define NV_CORE_TIMER_H
+
+#include <nvcore/nvcore.h>
+
+#if 1
+
+#include <time.h> //clock
+
+class NVCORE_CLASS Timer
+{
+public:
+	Timer() {}
+	
+	void start() { m_start = clock(); }
+    void stop() { m_stop = clock(); }
+
+	int elapsed() const { return (1000 * (m_stop - m_start)) / CLOCKS_PER_SEC; }
+	
+private:
+	clock_t m_start;
+    clock_t m_stop;
+};
+
+#else
+
+#define WINDOWS_LEAN_AND_MEAN
+#define VC_EXTRALEAN
+#define NOMINMAX
+#include <windows.h>
+
+class NVCORE_CLASS Timer
+{
+public:
+	Timer() {
+        // get the tick frequency from the OS
+        QueryPerformanceFrequency((LARGE_INTEGER*) &m_frequency);
+    }
+	
+	void start() { QueryPerformanceCounter((LARGE_INTEGER*) &m_start); }
+    void stop() { QueryPerformanceCounter((LARGE_INTEGER*) &m_stop); }
+
+	int elapsed() const {
+        return (int)1000 * ((double)m_stop.QuadPart - (double)m_start.QuadPart) / (double)m_frequency.QuadPart;
+    }
+	
+private:
+    LARGE_INTEGER  m_frequency;
+    LARGE_INTEGER  m_start;
+    LARGE_INTEGER  m_stop;
+
+};
+
+#endif // 0
+
+
+
+#endif // NV_CORE_TIMER_H