mirror of
https://github.com/libsdl-org/SDL.git
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217 lines
7.1 KiB
C
217 lines
7.1 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef SDL_timer_h_
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#define SDL_timer_h_
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/**
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* # CategoryTimer
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*
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* SDL time management routines.
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*/
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#include <SDL3/SDL_stdinc.h>
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#include <SDL3/SDL_error.h>
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#include <SDL3/SDL_begin_code.h>
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* SDL time constants */
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#define SDL_MS_PER_SECOND 1000
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#define SDL_US_PER_SECOND 1000000
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#define SDL_NS_PER_SECOND 1000000000LL
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#define SDL_NS_PER_MS 1000000
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#define SDL_NS_PER_US 1000
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#define SDL_SECONDS_TO_NS(S) (((Uint64)(S)) * SDL_NS_PER_SECOND)
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#define SDL_NS_TO_SECONDS(NS) ((NS) / SDL_NS_PER_SECOND)
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#define SDL_MS_TO_NS(MS) (((Uint64)(MS)) * SDL_NS_PER_MS)
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#define SDL_NS_TO_MS(NS) ((NS) / SDL_NS_PER_MS)
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#define SDL_US_TO_NS(US) (((Uint64)(US)) * SDL_NS_PER_US)
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#define SDL_NS_TO_US(NS) ((NS) / SDL_NS_PER_US)
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/**
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* Get the number of milliseconds since SDL library initialization.
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*
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* \returns an unsigned 64-bit value representing the number of milliseconds
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* since the SDL library initialized.
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*
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* \since This function is available since SDL 3.0.0.
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*/
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extern SDL_DECLSPEC Uint64 SDLCALL SDL_GetTicks(void);
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/**
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* Get the number of nanoseconds since SDL library initialization.
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*
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* \returns an unsigned 64-bit value representing the number of nanoseconds
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* since the SDL library initialized.
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*
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* \since This function is available since SDL 3.0.0.
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*/
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extern SDL_DECLSPEC Uint64 SDLCALL SDL_GetTicksNS(void);
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/**
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* Get the current value of the high resolution counter.
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*
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* This function is typically used for profiling.
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*
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* The counter values are only meaningful relative to each other. Differences
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* between values can be converted to times by using
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* SDL_GetPerformanceFrequency().
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*
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* \returns the current counter value.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_GetPerformanceFrequency
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*/
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extern SDL_DECLSPEC Uint64 SDLCALL SDL_GetPerformanceCounter(void);
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/**
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* Get the count per second of the high resolution counter.
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*
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* \returns a platform-specific count per second.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_GetPerformanceCounter
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*/
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extern SDL_DECLSPEC Uint64 SDLCALL SDL_GetPerformanceFrequency(void);
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/**
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* Wait a specified number of milliseconds before returning.
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*
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* This function waits a specified number of milliseconds before returning. It
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* waits at least the specified time, but possibly longer due to OS
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* scheduling.
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*
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* \param ms the number of milliseconds to delay
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*
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* \since This function is available since SDL 3.0.0.
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*/
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extern SDL_DECLSPEC void SDLCALL SDL_Delay(Uint32 ms);
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/**
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* Wait a specified number of nanoseconds before returning.
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*
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* This function waits a specified number of nanoseconds before returning. It
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* waits at least the specified time, but possibly longer due to OS
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* scheduling.
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*
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* \param ns the number of nanoseconds to delay
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*
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* \since This function is available since SDL 3.0.0.
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*/
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extern SDL_DECLSPEC void SDLCALL SDL_DelayNS(Uint64 ns);
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/**
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* Function prototype for the timer callback function.
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*
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* The callback function is passed the current timer interval and returns the
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* next timer interval, in milliseconds. If the returned value is the same as
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* the one passed in, the periodic alarm continues, otherwise a new alarm is
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* scheduled. If the callback returns 0, the periodic alarm is cancelled.
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*
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* \param interval the current callback time interval.
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* \param param an arbitrary pointer provided by the app through SDL_AddTimer,
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* for its own use.
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* \returns the new callback time interval, or 0 to disable further runs of
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* the callback.
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*
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* \threadsafety SDL may call this callback at any time from a background
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* thread; the application is responsible for locking resources
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* the callback touches that need to be protected.
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*
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* \since This datatype is available since SDL 3.0.0.
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*
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* \sa SDL_AddTimer
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*/
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typedef Uint32 (SDLCALL *SDL_TimerCallback)(Uint32 interval, void *param);
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/**
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* Definition of the timer ID type.
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*
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* \since This datatype is available since SDL 3.0.0.
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*/
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typedef Uint32 SDL_TimerID;
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/**
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* Call a callback function at a future time.
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*
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* If you use this function, you must pass `SDL_INIT_TIMER` to SDL_Init().
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*
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* The callback function is passed the current timer interval and the user
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* supplied parameter from the SDL_AddTimer() call and should return the next
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* timer interval. If the value returned from the callback is 0, the timer is
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* canceled.
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*
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* The callback is run on a separate thread.
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*
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* Timers take into account the amount of time it took to execute the
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* callback. For example, if the callback took 250 ms to execute and returned
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* 1000 (ms), the timer would only wait another 750 ms before its next
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* iteration.
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*
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* Timing may be inexact due to OS scheduling. Be sure to note the current
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* time with SDL_GetTicksNS() or SDL_GetPerformanceCounter() in case your
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* callback needs to adjust for variances.
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*
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* \param interval the timer delay, in milliseconds, passed to `callback`
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* \param callback the SDL_TimerCallback function to call when the specified
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* `interval` elapses
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* \param param a pointer that is passed to `callback`
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* \returns a timer ID or 0 if an error occurs; call SDL_GetError() for more
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* information.
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*
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* \threadsafety It is safe to call this function from any thread.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_RemoveTimer
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*/
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extern SDL_DECLSPEC SDL_TimerID SDLCALL SDL_AddTimer(Uint32 interval,
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SDL_TimerCallback callback,
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void *param);
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/**
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* Remove a timer created with SDL_AddTimer().
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*
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* \param id the ID of the timer to remove
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* \returns SDL_TRUE if the timer is removed or SDL_FALSE if the timer wasn't
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* found.
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*
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* \since This function is available since SDL 3.0.0.
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*
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* \sa SDL_AddTimer
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*/
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extern SDL_DECLSPEC SDL_bool SDLCALL SDL_RemoveTimer(SDL_TimerID id);
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include <SDL3/SDL_close_code.h>
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#endif /* SDL_timer_h_ */
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