🛠️🐜 Antkeeper superbuild with dependencies included
https://antkeeper.com
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
222 lines
7.1 KiB
222 lines
7.1 KiB
/*
|
|
Simple DirectMedia Layer
|
|
Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you must not
|
|
claim that you wrote the original software. If you use this software
|
|
in a product, an acknowledgment in the product documentation would be
|
|
appreciated but is not required.
|
|
2. Altered source versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
3. This notice may not be removed or altered from any source distribution.
|
|
*/
|
|
|
|
#ifndef SDL_timer_h_
|
|
#define SDL_timer_h_
|
|
|
|
/**
|
|
* \file SDL_timer.h
|
|
*
|
|
* Header for the SDL time management routines.
|
|
*/
|
|
|
|
#include "SDL_stdinc.h"
|
|
#include "SDL_error.h"
|
|
|
|
#include "begin_code.h"
|
|
/* Set up for C function definitions, even when using C++ */
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* Get the number of milliseconds since SDL library initialization.
|
|
*
|
|
* This value wraps if the program runs for more than ~49 days.
|
|
*
|
|
* This function is not recommended as of SDL 2.0.18; use SDL_GetTicks64()
|
|
* instead, where the value doesn't wrap every ~49 days. There are places in
|
|
* SDL where we provide a 32-bit timestamp that can not change without
|
|
* breaking binary compatibility, though, so this function isn't officially
|
|
* deprecated.
|
|
*
|
|
* \returns an unsigned 32-bit value representing the number of milliseconds
|
|
* since the SDL library initialized.
|
|
*
|
|
* \since This function is available since SDL 2.0.0.
|
|
*
|
|
* \sa SDL_TICKS_PASSED
|
|
*/
|
|
extern DECLSPEC Uint32 SDLCALL SDL_GetTicks(void);
|
|
|
|
/**
|
|
* Get the number of milliseconds since SDL library initialization.
|
|
*
|
|
* Note that you should not use the SDL_TICKS_PASSED macro with values
|
|
* returned by this function, as that macro does clever math to compensate for
|
|
* the 32-bit overflow every ~49 days that SDL_GetTicks() suffers from. 64-bit
|
|
* values from this function can be safely compared directly.
|
|
*
|
|
* For example, if you want to wait 100 ms, you could do this:
|
|
*
|
|
* ```c
|
|
* const Uint64 timeout = SDL_GetTicks64() + 100;
|
|
* while (SDL_GetTicks64() < timeout) {
|
|
* // ... do work until timeout has elapsed
|
|
* }
|
|
* ```
|
|
*
|
|
* \returns an unsigned 64-bit value representing the number of milliseconds
|
|
* since the SDL library initialized.
|
|
*
|
|
* \since This function is available since SDL 2.0.18.
|
|
*/
|
|
extern DECLSPEC Uint64 SDLCALL SDL_GetTicks64(void);
|
|
|
|
/**
|
|
* Compare 32-bit SDL ticks values, and return true if `A` has passed `B`.
|
|
*
|
|
* This should be used with results from SDL_GetTicks(), as this macro
|
|
* attempts to deal with the 32-bit counter wrapping back to zero every ~49
|
|
* days, but should _not_ be used with SDL_GetTicks64(), which does not have
|
|
* that problem.
|
|
*
|
|
* For example, with SDL_GetTicks(), if you want to wait 100 ms, you could
|
|
* do this:
|
|
*
|
|
* ```c
|
|
* const Uint32 timeout = SDL_GetTicks() + 100;
|
|
* while (!SDL_TICKS_PASSED(SDL_GetTicks(), timeout)) {
|
|
* // ... do work until timeout has elapsed
|
|
* }
|
|
* ```
|
|
*
|
|
* Note that this does not handle tick differences greater
|
|
* than 2^31 so take care when using the above kind of code
|
|
* with large timeout delays (tens of days).
|
|
*/
|
|
#define SDL_TICKS_PASSED(A, B) ((Sint32)((B) - (A)) <= 0)
|
|
|
|
/**
|
|
* Get the current value of the high resolution counter.
|
|
*
|
|
* This function is typically used for profiling.
|
|
*
|
|
* The counter values are only meaningful relative to each other. Differences
|
|
* between values can be converted to times by using
|
|
* SDL_GetPerformanceFrequency().
|
|
*
|
|
* \returns the current counter value.
|
|
*
|
|
* \since This function is available since SDL 2.0.0.
|
|
*
|
|
* \sa SDL_GetPerformanceFrequency
|
|
*/
|
|
extern DECLSPEC Uint64 SDLCALL SDL_GetPerformanceCounter(void);
|
|
|
|
/**
|
|
* Get the count per second of the high resolution counter.
|
|
*
|
|
* \returns a platform-specific count per second.
|
|
*
|
|
* \since This function is available since SDL 2.0.0.
|
|
*
|
|
* \sa SDL_GetPerformanceCounter
|
|
*/
|
|
extern DECLSPEC Uint64 SDLCALL SDL_GetPerformanceFrequency(void);
|
|
|
|
/**
|
|
* Wait a specified number of milliseconds before returning.
|
|
*
|
|
* This function waits a specified number of milliseconds before returning. It
|
|
* waits at least the specified time, but possibly longer due to OS
|
|
* scheduling.
|
|
*
|
|
* \param ms the number of milliseconds to delay
|
|
*
|
|
* \since This function is available since SDL 2.0.0.
|
|
*/
|
|
extern DECLSPEC void SDLCALL SDL_Delay(Uint32 ms);
|
|
|
|
/**
|
|
* Function prototype for the timer callback function.
|
|
*
|
|
* The callback function is passed the current timer interval and returns
|
|
* the next timer interval. If the returned value is the same as the one
|
|
* passed in, the periodic alarm continues, otherwise a new alarm is
|
|
* scheduled. If the callback returns 0, the periodic alarm is cancelled.
|
|
*/
|
|
typedef Uint32 (SDLCALL * SDL_TimerCallback) (Uint32 interval, void *param);
|
|
|
|
/**
|
|
* Definition of the timer ID type.
|
|
*/
|
|
typedef int SDL_TimerID;
|
|
|
|
/**
|
|
* Call a callback function at a future time.
|
|
*
|
|
* If you use this function, you must pass `SDL_INIT_TIMER` to SDL_Init().
|
|
*
|
|
* The callback function is passed the current timer interval and the user
|
|
* supplied parameter from the SDL_AddTimer() call and should return the next
|
|
* timer interval. If the value returned from the callback is 0, the timer is
|
|
* canceled.
|
|
*
|
|
* The callback is run on a separate thread.
|
|
*
|
|
* Timers take into account the amount of time it took to execute the
|
|
* callback. For example, if the callback took 250 ms to execute and returned
|
|
* 1000 (ms), the timer would only wait another 750 ms before its next
|
|
* iteration.
|
|
*
|
|
* Timing may be inexact due to OS scheduling. Be sure to note the current
|
|
* time with SDL_GetTicks() or SDL_GetPerformanceCounter() in case your
|
|
* callback needs to adjust for variances.
|
|
*
|
|
* \param interval the timer delay, in milliseconds, passed to `callback`
|
|
* \param callback the SDL_TimerCallback function to call when the specified
|
|
* `interval` elapses
|
|
* \param param a pointer that is passed to `callback`
|
|
* \returns a timer ID or 0 if an error occurs; call SDL_GetError() for more
|
|
* information.
|
|
*
|
|
* \since This function is available since SDL 2.0.0.
|
|
*
|
|
* \sa SDL_RemoveTimer
|
|
*/
|
|
extern DECLSPEC SDL_TimerID SDLCALL SDL_AddTimer(Uint32 interval,
|
|
SDL_TimerCallback callback,
|
|
void *param);
|
|
|
|
/**
|
|
* Remove a timer created with SDL_AddTimer().
|
|
*
|
|
* \param id the ID of the timer to remove
|
|
* \returns SDL_TRUE if the timer is removed or SDL_FALSE if the timer wasn't
|
|
* found.
|
|
*
|
|
* \since This function is available since SDL 2.0.0.
|
|
*
|
|
* \sa SDL_AddTimer
|
|
*/
|
|
extern DECLSPEC SDL_bool SDLCALL SDL_RemoveTimer(SDL_TimerID id);
|
|
|
|
|
|
/* Ends C function definitions when using C++ */
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#include "close_code.h"
|
|
|
|
#endif /* SDL_timer_h_ */
|
|
|
|
/* vi: set ts=4 sw=4 expandtab: */
|