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Add more documentation to runloop.c

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This commit is contained in:
twinaphex 2015-01-10 21:47:30 +01:00
parent 75b6ed9545
commit d6169e6ddc
1 changed files with 39 additions and 15 deletions
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54
runloop.c
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@ -397,6 +397,17 @@ static bool check_movie(void)
return check_movie_record(); return check_movie_record();
} }
/**
* check_shader_dir:
* @pressed_next : was next shader key pressed?
* @pressed_previous : was previous shader key pressed?
*
* Checks if any one of the shader keys has been pressed for this frame:
* a) Next shader index.
* b) Previous shader index.
*
* Will also immediately apply the shader.
**/
static void check_shader_dir(bool pressed_next, bool pressed_prev) static void check_shader_dir(bool pressed_next, bool pressed_prev)
{ {
char msg[PATH_MAX_LENGTH]; char msg[PATH_MAX_LENGTH];
@ -588,6 +599,11 @@ static inline int time_to_exit(retro_input_t input)
return 0; return 0;
} }
/**
* update_frame_time:
*
* Updates frame timing if frame timing callback is in use by the core.
**/
static void update_frame_time(void) static void update_frame_time(void)
{ {
retro_time_t curr_time = rarch_get_time_usec(); retro_time_t curr_time = rarch_get_time_usec();
@ -623,30 +639,38 @@ static void do_state_check_menu_toggle(void)
} }
#endif #endif
/**
* limit_frame_time:
*
* Limit frame time if fast forward ratio throttle is enabled.
**/
static void limit_frame_time(void) static void limit_frame_time(void)
{ {
retro_time_t current = rarch_get_time_usec(); double effective_fps, mft_f;
retro_time_t target = 0, to_sleep_ms = 0; retro_time_t current, target = 0, to_sleep_ms = 0;
double effective_fps = g_extern.system.av_info.timing.fps
current = rarch_get_time_usec();
effective_fps = g_extern.system.av_info.timing.fps
* g_settings.fastforward_ratio; * g_settings.fastforward_ratio;
double mft_f = 1000000.0f / effective_fps; mft_f = 1000000.0f / effective_fps;
g_extern.frame_limit.minimum_frame_time = (retro_time_t) roundf(mft_f); g_extern.frame_limit.minimum_frame_time = (retro_time_t) roundf(mft_f);
target = g_extern.frame_limit.last_frame_time + target = g_extern.frame_limit.last_frame_time +
g_extern.frame_limit.minimum_frame_time; g_extern.frame_limit.minimum_frame_time;
to_sleep_ms = (target - current) / 1000; to_sleep_ms = (target - current) / 1000;
if (to_sleep_ms > 0) if (to_sleep_ms <= 0)
{ {
rarch_sleep((unsigned int)to_sleep_ms);
/* Combat jitter a bit. */
g_extern.frame_limit.last_frame_time +=
g_extern.frame_limit.minimum_frame_time;
}
else
g_extern.frame_limit.last_frame_time = rarch_get_time_usec(); g_extern.frame_limit.last_frame_time = rarch_get_time_usec();
return;
}
rarch_sleep((unsigned int)to_sleep_ms);
/* Combat jitter a bit. */
g_extern.frame_limit.last_frame_time +=
g_extern.frame_limit.minimum_frame_time;
} }
static void check_block_hotkey(bool enable_hotkey) static void check_block_hotkey(bool enable_hotkey)