Small OpenGL based c++ rendering library
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fpsmanager.cpp 1.5KB

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  1. /* libsegl - Sebas Extended GL Library
  2. * Collection of Opengl/3D-Math helpers
  3. *
  4. * Copyright (c) 2008 by Sebastian Lohff, seba@seba-geek.de
  5. * http://www.seba-geek.de
  6. *
  7. * This library is free software; you can redistribute it and/or
  8. * modify it under the terms of the GNU Library General Public
  9. * License as published by the Free Software Foundation; either
  10. * version 2 of the License, or (at your option) any later version.
  11. *
  12. * This library is distributed in the hope that it will be useful,
  13. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15. * Library General Public License for more details.
  16. *
  17. * You should have received a copy of the GNU Library General Public
  18. * License along with this library; if not, write to the
  19. * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  20. * Boston, MA 02110-1301, USA.
  21. */
  22. #include "fpsmanager.h"
  23. namespace segl {
  24. FPSManager::FPSManager(int _fps) {
  25. setFPS(_fps);
  26. frames = 0;
  27. framerate = 0;
  28. lastticks = SDL_GetTicks();
  29. }
  30. void FPSManager::setFPS(int _fps) {
  31. if(_fps<1 || _fps > 500)
  32. return;
  33. tickrate = 1000.0f/(float)_fps;
  34. }
  35. void FPSManager::delay() {
  36. frames++;
  37. Uint32 now = SDL_GetTicks();
  38. Uint32 target = lastticks + (Uint32)(tickrate * (float)frames);
  39. if(now <= target) {
  40. SDL_Delay(target-now);
  41. } else {
  42. framerate = frames/((now-lastticks)/1000.0f);
  43. frames = 0;
  44. lastticks = SDL_GetTicks();
  45. }
  46. }
  47. float FPSManager::getFPS() {
  48. return framerate;
  49. }
  50. } // namespace segl