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Simplify rarch_frame_limit_time

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This commit is contained in:
twinaphex 2015-08-27 13:56:59 +02:00
parent 84c029e2e0
commit d4534cca19
1 changed files with 26 additions and 22 deletions
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48
runloop.c
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@ -628,6 +628,7 @@ static INLINE int time_to_exit(driver_t *driver, global_t *global,
* rarch_update_frame_time:
*
* Updates frame timing if frame timing callback is in use by the core.
* Limits frame time if fast forward ratio throttle is enabled.
**/
static void rarch_update_frame_time(driver_t *driver, float slowmotion_ratio,
rarch_system_info_t *system)
@ -651,26 +652,34 @@ static void rarch_update_frame_time(driver_t *driver, float slowmotion_ratio,
system->frame_time.callback(delta);
}
static void rarch_limit_frame_time(float fastforward_ratio)
static int rarch_limit_frame_time(settings_t *settings)
{
retro_time_t current = rarch_get_time_usec();
struct retro_system_av_info *av_info = video_viewport_get_system_av_info();
double effective_fps = av_info->timing.fps * fastforward_ratio;
double mft_f = 1000000.0f / effective_fps;
retro_time_t frame_limit_minimum_time = (retro_time_t) roundf(mft_f);
retro_time_t target = frame_limit_last_time + frame_limit_minimum_time;
retro_time_t to_sleep_ms = (target - current) / 1000;
double effective_fps, mft_f;
retro_time_t current, target, to_sleep_ms, frame_limit_minimum_time;
struct retro_system_av_info *av_info;
float fastforward_ratio = settings->fastforward_ratio;
if (to_sleep_ms <= 0)
if (!settings->fastforward_ratio_throttle_enable)
return 0;
av_info = video_viewport_get_system_av_info();
effective_fps = av_info->timing.fps * fastforward_ratio;
mft_f = 1000000.0f / effective_fps;
frame_limit_minimum_time = (retro_time_t) roundf(mft_f);
current = rarch_get_time_usec();
target = frame_limit_last_time + frame_limit_minimum_time;
to_sleep_ms = (target - current) / 1000;
if (to_sleep_ms > 0)
{
frame_limit_last_time = rarch_get_time_usec();
return;
rarch_sleep((unsigned int)to_sleep_ms);
/* Combat jitter a bit. */
frame_limit_last_time += frame_limit_minimum_time;
}
else
frame_limit_last_time = rarch_get_time_usec();
rarch_sleep((unsigned int)to_sleep_ms);
/* Combat jitter a bit. */
frame_limit_last_time += frame_limit_minimum_time;
return 0;
}
/**
@ -1075,7 +1084,7 @@ int rarch_main_iterate(void)
if (!input && settings->menu.pause_libretro)
return 1;
goto success;
return rarch_limit_frame_time(settings);
}
#endif
@ -1141,10 +1150,5 @@ int rarch_main_iterate(void)
unlock_autosave();
#endif
success:
/* Limit frame time if fast forward ratio throttle is enabled. */
if (settings->fastforward_ratio_throttle_enable)
rarch_limit_frame_time(settings->fastforward_ratio);
return 0;
return rarch_limit_frame_time(settings);
}