| 1 | #include <sys/time.h> |
| 2 | #include "main.h" |
| 3 | #include "gp2x.h" |
| 4 | #include "throttle.h" |
| 5 | |
| 6 | #if 0 |
| 7 | static uint64 tfreq; |
| 8 | static uint64 desiredfps; |
| 9 | |
| 10 | void RefreshThrottleFPS(void) |
| 11 | { |
| 12 | uint64 f=FCEUI_GetDesiredFPS(); |
| 13 | // great, a bit faster than before |
| 14 | //f = (f*65) >> 6; |
| 15 | desiredfps=f>>8; |
| 16 | tfreq=1000000; |
| 17 | tfreq<<=16; /* Adjustment for fps returned from FCEUI_GetDesiredFPS(). */ |
| 18 | } |
| 19 | |
| 20 | static uint64 GetCurTime(void) |
| 21 | { |
| 22 | uint64 ret; |
| 23 | struct timeval tv; |
| 24 | |
| 25 | gettimeofday(&tv,0); |
| 26 | ret=(uint64)tv.tv_sec*1000000; |
| 27 | ret+=tv.tv_usec; |
| 28 | return(ret); |
| 29 | } |
| 30 | |
| 31 | INLINE void SpeedThrottle(void) |
| 32 | { |
| 33 | static uint64 ttime,ltime; |
| 34 | |
| 35 | waiter: |
| 36 | |
| 37 | ttime=GetCurTime(); |
| 38 | |
| 39 | if( (ttime-ltime) < (tfreq/desiredfps) ) |
| 40 | { |
| 41 | goto waiter; |
| 42 | } |
| 43 | if( (ttime-ltime) >= (tfreq*4/desiredfps)) |
| 44 | ltime=ttime; |
| 45 | else |
| 46 | ltime+=tfreq/desiredfps; |
| 47 | } |
| 48 | |
| 49 | #else |
| 50 | |
| 51 | extern uint8 PAL; |
| 52 | extern int FSkip; |
| 53 | static int usec_aim = 0, usec_done = 0; |
| 54 | static int skip_count = 0; |
| 55 | |
| 56 | INLINE void SpeedThrottle(void) |
| 57 | { |
| 58 | static struct timeval tv_prev; |
| 59 | struct timeval tv_now; |
| 60 | int delta_nom = PAL ? 19997 : 16639; // ~50.007, 19.997 ms/frame : ~60.1, 16.639 ms/frame |
| 61 | |
| 62 | |
| 63 | if (usec_done == 0) { // first time |
| 64 | usec_done = 1; |
| 65 | gettimeofday(&tv_prev, 0); |
| 66 | return; |
| 67 | } |
| 68 | |
| 69 | gettimeofday(&tv_now, 0); |
| 70 | |
| 71 | usec_aim += delta_nom; |
| 72 | if (tv_now.tv_sec != tv_prev.tv_sec) |
| 73 | usec_done += 1000000; |
| 74 | usec_done += tv_now.tv_usec - tv_prev.tv_usec; |
| 75 | |
| 76 | #ifdef FRAMESKIP |
| 77 | if (Settings.frameskip >= 0) |
| 78 | { |
| 79 | if (skip_count >= Settings.frameskip) |
| 80 | skip_count = 0; |
| 81 | else { |
| 82 | skip_count++; |
| 83 | FSkip = 1; |
| 84 | } |
| 85 | } |
| 86 | else if (usec_done > usec_aim + 1024*4) |
| 87 | { |
| 88 | /* auto frameskip */ |
| 89 | if (usec_done - usec_aim > 1024*32) |
| 90 | usec_done = usec_aim = 1; // too much behind, try to recover.. |
| 91 | else |
| 92 | FSkip = 1; |
| 93 | tv_prev = tv_now; |
| 94 | return; |
| 95 | } |
| 96 | #endif |
| 97 | |
| 98 | tv_prev = tv_now; |
| 99 | while (usec_done < usec_aim) |
| 100 | { |
| 101 | gettimeofday(&tv_now, 0); |
| 102 | |
| 103 | if (tv_now.tv_sec != tv_prev.tv_sec) |
| 104 | usec_done += 1000000; |
| 105 | usec_done += tv_now.tv_usec - tv_prev.tv_usec; |
| 106 | tv_prev = tv_now; |
| 107 | } |
| 108 | usec_done = usec_done - usec_aim + 1; // reset to prevent overflows |
| 109 | usec_aim = 0; |
| 110 | } |
| 111 | #endif |
| 112 | |