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115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2019 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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* \file SDL_timer.h
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*
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* Header for the SDL time management routines.
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*/
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#include "SDL_stdinc.h"
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#include "SDL_error.h"
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#include "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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/**
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* \brief Get the number of milliseconds since the SDL library initialization.
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*
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* \note This value wraps if the program runs for more than ~49 days.
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*/
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extern DECLSPEC Uint32 SDLCALL SDL_GetTicks(void);
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/**
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* \brief Compare SDL ticks values, and return true if A has passed B
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*
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* e.g. if you want to wait 100 ms, you could do this:
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* Uint32 timeout = SDL_GetTicks() + 100;
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* while (!SDL_TICKS_PASSED(SDL_GetTicks(), timeout)) {
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* ... do work until timeout has elapsed
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* }
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*/
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#define SDL_TICKS_PASSED(A, B) ((Sint32)((B) - (A)) <= 0)
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/**
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* \brief Get the current value of the high resolution counter
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*/
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extern DECLSPEC Uint64 SDLCALL SDL_GetPerformanceCounter(void);
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/**
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* \brief Get the count per second of the high resolution counter
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*/
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extern DECLSPEC Uint64 SDLCALL SDL_GetPerformanceFrequency(void);
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/**
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* \brief Wait a specified number of milliseconds before returning.
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*/
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extern DECLSPEC void SDLCALL SDL_Delay(Uint32 ms);
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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
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* the next timer interval. If the returned value is the same as the one
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* 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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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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typedef int SDL_TimerID;
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/**
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* \brief Add a new timer to the pool of timers already running.
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*
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* \return A timer ID, or 0 when an error occurs.
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*/
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extern 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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* \brief Remove a timer knowing its ID.
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*
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* \return A boolean value indicating success or failure.
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*
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* \warning It is not safe to remove a timer multiple times.
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*/
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extern 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 "close_code.h"
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#endif /* SDL_timer_h_ */
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/* vi: set ts=4 sw=4 expandtab: */
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