drivers/cli/throttle.c

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