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wintimer.cpp
Package: celestia-1.6.0.tar.gz　[view]
Upload User: center1979
Upload Date: 2022-07-26
Package Size: 50633k
Code Size: 1k
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OpenGL program

Development Platform:

Visual C++

wintimer.cpp：Code Content
  1. // wintimer.h
  2. // 
  3. // Copyright (C) 2001, Chris Laurel <claurel@shatters.net>
  4. //
  5. // This program is free software; you can redistribute it and/or
  6. // modify it under the terms of the GNU General Public License
  7. // as published by the Free Software Foundation; either version 2
  8. // of the License, or (at your option) any later version.
  10. #include <windows.h>
  11. #include "timer.h"
  13. class WindowsTimer : public Timer
  14. {
  15. public:
  16.     WindowsTimer();
  17.     ~WindowsTimer();
  18.     double getTime() const;
  19.     void reset();
  21. private:
  22.     LARGE_INTEGER freq;
  23.     LARGE_INTEGER start;
  24. };
  27. WindowsTimer::WindowsTimer()
  28. {
  29.     QueryPerformanceFrequency(&freq);
  30.     reset();
  31. }
  33. WindowsTimer::~WindowsTimer()
  34. {
  35. }
  37. double WindowsTimer::getTime() const
  38. {
  39.     LARGE_INTEGER t;
  40.     QueryPerformanceCounter(&t);
  41.     return (double) (t.QuadPart - start.QuadPart) / (double) freq.QuadPart;
  42. }
  44. void WindowsTimer::reset()
  45. {
  46.     QueryPerformanceCounter(&start);
  47. }
  49. Timer* CreateTimer()
  50. {
  51.     return new WindowsTimer();
  52. }