drivers/cli/throttle.c

   1 #include <sys/time.h>
   2 #include <unistd.h>
   3 #include "main.h"
   4 #include "throttle.h"
   5
   6 static uint64 tfreq;
   7 static uint64 desiredfps;
   8
   9 void RefreshThrottleFPS(void)
  10 {
  11  desiredfps=FCEUI_GetDesiredFPS()>>8;
  12  tfreq=1000000;
  13  tfreq<<=16;    /* Adjustment for fps returned from FCEUI_GetDesiredFPS(). */
  14 }
  15
  16 static uint64 GetCurTime(void)
  17 {
  18  uint64 ret;
  19  struct timeval tv;
  20
  21  gettimeofday(&tv,0);
  22  ret=(uint64)tv.tv_sec*1000000;
  23  ret+=tv.tv_usec;
  24  return(ret);
  25 }
  26
  27 void SpeedThrottle(void)
  28 {
  29  static uint64 ttime,ltime;
  30
  31  waiter:
  32
  33  ttime=GetCurTime();
  34
  35  if( (ttime-ltime) < (tfreq/desiredfps) )
  36  {
  37   usleep(1000);
  38   goto waiter;
  39  }
  40  if( (ttime-ltime) >= (tfreq*4/desiredfps))
  41   ltime=ttime;
  42  else
  43   ltime+=tfreq/desiredfps;
  44 }
  45