Mercurial > sdl-ios-xcode
annotate include/SDL_timer.h @ 2378:d76ecec0c3f7 gsoc2008_iphone
iPhone SDL 1.3 demos go here. All these demos are written using pure SDL 1.3 code. No compatibility calls! Perhaps if they are any good they could be use as tests for the SDL 1.3 release.
| author | Holmes Futrell <hfutrell@umail.ucsb.edu> |
|---|---|
| date | Fri, 18 Jul 2008 20:46:02 +0000 |
| parents | c121d94672cb |
| children | 99210400e8b9 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifndef _SDL_timer_h | |
| 24 #define _SDL_timer_h | |
| 25 | |
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26 /** |
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27 * \file SDL_timer.h |
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28 * |
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29 * Header for the SDL time management routines |
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30 */ |
| 0 | 31 |
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32 #include "SDL_stdinc.h" |
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33 #include "SDL_error.h" |
| 0 | 34 |
| 35 #include "begin_code.h" | |
| 36 /* Set up for C function definitions, even when using C++ */ | |
| 37 #ifdef __cplusplus | |
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38 /* *INDENT-OFF* */ |
| 0 | 39 extern "C" { |
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40 /* *INDENT-ON* */ |
| 0 | 41 #endif |
| 42 | |
| 43 /* This is the OS scheduler timeslice, in milliseconds */ | |
| 44 #define SDL_TIMESLICE 10 | |
| 45 | |
| 46 /* This is the maximum resolution of the SDL timer on all platforms */ | |
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47 #define TIMER_RESOLUTION 10 /* Experimentally determined */ |
| 0 | 48 |
| 49 /* Get the number of milliseconds since the SDL library initialization. | |
| 50 * Note that this value wraps if the program runs for more than ~49 days. | |
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51 */ |
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52 extern DECLSPEC Uint32 SDLCALL SDL_GetTicks(void); |
| 0 | 53 |
| 54 /* Wait a specified number of milliseconds before returning */ | |
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55 extern DECLSPEC void SDLCALL SDL_Delay(Uint32 ms); |
| 0 | 56 |
| 57 /* Function prototype for the timer callback function */ | |
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58 typedef Uint32(SDLCALL * SDL_TimerCallback) (Uint32 interval); |
| 0 | 59 |
| 60 /* Set a callback to run after the specified number of milliseconds has | |
| 61 * elapsed. The callback function is passed the current timer interval | |
| 62 * and returns the next timer interval. If the returned value is the | |
| 63 * same as the one passed in, the periodic alarm continues, otherwise a | |
| 64 * new alarm is scheduled. If the callback returns 0, the periodic alarm | |
| 65 * is cancelled. | |
| 66 * | |
| 67 * To cancel a currently running timer, call SDL_SetTimer(0, NULL); | |
| 68 * | |
| 69 * The timer callback function may run in a different thread than your | |
| 70 * main code, and so shouldn't call any functions from within itself. | |
| 71 * | |
| 72 * The maximum resolution of this timer is 10 ms, which means that if | |
| 73 * you request a 16 ms timer, your callback will run approximately 20 ms | |
| 74 * later on an unloaded system. If you wanted to set a flag signaling | |
| 75 * a frame update at 30 frames per second (every 33 ms), you might set a | |
| 76 * timer for 30 ms: | |
| 77 * SDL_SetTimer((33/10)*10, flag_update); | |
| 78 * | |
| 79 * If you use this function, you need to pass SDL_INIT_TIMER to SDL_Init(). | |
| 80 * | |
| 81 * Under UNIX, you should not use raise or use SIGALRM and this function | |
| 82 * in the same program, as it is implemented using setitimer(). You also | |
| 83 * should not use this function in multi-threaded applications as signals | |
| 84 * to multi-threaded apps have undefined behavior in some implementations. | |
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85 * |
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86 * This function returns 0 if successful, or -1 if there was an error. |
| 0 | 87 */ |
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88 extern DECLSPEC int SDLCALL SDL_SetTimer(Uint32 interval, |
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89 SDL_TimerCallback callback); |
| 0 | 90 |
| 91 /* New timer API, supports multiple timers | |
| 92 * Written by Stephane Peter <megastep@lokigames.com> | |
| 93 */ | |
| 94 | |
| 95 /* Function prototype for the new timer callback function. | |
| 96 * The callback function is passed the current timer interval and returns | |
| 97 * the next timer interval. If the returned value is the same as the one | |
| 98 * passed in, the periodic alarm continues, otherwise a new alarm is | |
| 99 * scheduled. If the callback returns 0, the periodic alarm is cancelled. | |
| 100 */ | |
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101 typedef Uint32(SDLCALL * SDL_NewTimerCallback) (Uint32 interval, void *param); |
| 0 | 102 |
| 103 /* Definition of the timer ID type */ | |
| 104 typedef struct _SDL_TimerID *SDL_TimerID; | |
| 105 | |
| 106 /* Add a new timer to the pool of timers already running. | |
| 107 Returns a timer ID, or NULL when an error occurs. | |
| 108 */ | |
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109 extern DECLSPEC SDL_TimerID SDLCALL SDL_AddTimer(Uint32 interval, |
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110 SDL_NewTimerCallback |
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111 callback, void *param); |
| 0 | 112 |
| 113 /* Remove one of the multiple timers knowing its ID. | |
| 114 * Returns a boolean value indicating success. | |
| 115 */ | |
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116 extern DECLSPEC SDL_bool SDLCALL SDL_RemoveTimer(SDL_TimerID t); |
| 0 | 117 |
| 118 /* Ends C function definitions when using C++ */ | |
| 119 #ifdef __cplusplus | |
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120 /* *INDENT-OFF* */ |
| 0 | 121 } |
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122 /* *INDENT-ON* */ |
| 0 | 123 #endif |
| 124 #include "close_code.h" | |
| 125 | |
| 126 #endif /* _SDL_timer_h */ | |
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127 |
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128 /* vi: set ts=4 sw=4 expandtab: */ |