GFW: ctimer.cpp Source File

00001 #include "ctimer.h"
00002 
00003 /* The statically allocated pointer to the CTimerSystem singleton. */
00004 CTimerSystem *CSingletonManager<CTimerSystem>::unique_instance = 0;
00005 
00006 /* Restart the FPS timer. */
00007 void CFPSTimer::restart()
00008 {
00009   ticks_start = CTimerSystemManager::get_instance().get_ticks();
00010   ticks_end = 0;
00011   frame_time = 0;
00012   seconds_time = 0;
00013   frames_this_second = 0;
00014   fps = 0;
00015 }
00016 
00017 /* Update the FPS timer. */
00018 void CFPSTimer::update()
00019 {
00020   ticks_end = CTimerSystemManager::get_instance().get_ticks();
00021   frame_time = ticks_end - ticks_start;
00022   seconds_time += frame_time;
00023   if (seconds_time > 1000) {
00024     fps = frames_this_second;
00025     frames_this_second = 0;
00026     seconds_time = 0;
00027     notify();
00028   } else {
00029     frames_this_second++;
00030   }
00031   ticks_start = ticks_end;
00032   /* Now that we've made the FPS calculation, retroactively truncate
00033      the frame time to its max if needed. */
00034   if (frame_time > MAX_FRAME_TIME) frame_time = MAX_FRAME_TIME;
00035 }