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annotate src/timer/macos/SDL_systimer.c @ 1502:d403a39389da
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 13 Mar 2006 01:16:16 +0000 |
| parents | d910939febfa |
| children | 92947e3a18db |
| rev | line source |
|---|---|
| 0 | 1 /* |
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Updated copyright information and removed rcs id lines (problematic in branch merges)
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
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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 |
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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 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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c9b51268668f
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parents:
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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c9b51268668f
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parents:
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13 Lesser General Public License for more details. |
| 0 | 14 |
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parents:
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15 You should have received a copy of the GNU Lesser General Public |
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c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
parents:
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16 License along with this library; if not, write to the Free Software |
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c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
parents:
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
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parents:
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19 Sam Lantinga |
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c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
parents:
769
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20 slouken@libsdl.org |
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c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
parents:
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21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 #include <Types.h> | |
| 25 #include <Timer.h> | |
| 26 #include <OSUtils.h> | |
| 27 #include <Gestalt.h> | |
| 28 #include <Processes.h> | |
| 29 | |
| 30 #include <LowMem.h> | |
| 31 | |
| 32 #include "SDL_timer.h" | |
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New configure-based build system. Still work in progress, but much improved
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33 #include "../SDL_timer_c.h" |
| 0 | 34 |
| 35 #include "FastTimes.h" | |
| 36 | |
| 37 #define MS_PER_TICK (1000.0/60.0) /* MacOS tick = 1/60 second */ | |
| 38 | |
| 39 | |
| 40 #define kTwoPower32 (4294967296.0) /* 2^32 */ | |
| 41 | |
| 42 static double start_tick; | |
| 43 static int is_fast_inited = 0; | |
| 44 | |
| 45 void SDL_StartTicks(void) | |
| 46 { | |
| 47 if ( ! is_fast_inited ) // important to check or FastTime may hang machine! | |
| 48 SDL_SYS_TimerInit(); | |
| 49 | |
| 50 start_tick = FastMicroseconds(); | |
| 51 } | |
| 52 | |
| 53 Uint32 SDL_GetTicks(void) | |
| 54 { | |
| 55 | |
| 56 if ( ! is_fast_inited ) | |
| 57 SDL_SYS_TimerInit(); | |
| 58 | |
| 59 return FastMilliseconds(); | |
| 60 } | |
| 61 | |
| 62 void SDL_Delay(Uint32 ms) | |
| 63 { | |
| 64 Uint32 stop, now; | |
| 65 | |
| 66 stop = SDL_GetTicks() + ms; | |
| 67 do { | |
| 68 SystemTask(); | |
| 69 | |
| 70 now = SDL_GetTicks(); | |
| 71 | |
| 72 } while ( stop > now ); | |
| 73 } | |
| 74 | |
| 75 /* | |
| 76 void SDL_StartTicks(void) | |
| 77 { | |
| 78 // FIXME: Should we implement a wrapping algorithm, like Win32? | |
| 79 } | |
| 80 | |
| 81 Uint32 SDL_GetTicks(void) | |
| 82 { | |
| 83 UnsignedWide ms; | |
| 84 | |
| 85 Microseconds (&ms); | |
| 86 | |
| 87 return ( ms.lo / 1000 ); | |
| 88 } | |
| 89 | |
| 90 void SDL_Delay(Uint32 ms) | |
| 91 { | |
| 92 | |
| 93 UnsignedWide microsecs; | |
| 94 UInt32 stop; | |
| 95 | |
| 96 Microseconds (µsecs); | |
| 97 | |
| 98 stop = microsecs.lo + (ms * 1000); | |
| 99 | |
| 100 while ( stop > microsecs.lo ) { | |
| 101 | |
| 102 SystemTask (); | |
| 103 | |
| 104 Microseconds (µsecs); | |
| 105 } | |
| 106 | |
| 107 }*/ | |
| 108 | |
| 109 /* Data to handle a single periodic alarm */ | |
| 110 typedef struct _ExtendedTimerRec | |
| 111 { | |
| 112 TMTask tmTask; | |
| 113 ProcessSerialNumber taskPSN; | |
| 114 } ExtendedTimerRec, *ExtendedTimerPtr; | |
| 115 | |
| 116 static ExtendedTimerRec gExtendedTimerRec; | |
| 117 | |
| 118 | |
| 119 int SDL_SYS_TimerInit(void) | |
| 120 { | |
| 121 FastInitialize (); | |
| 122 is_fast_inited = 1; | |
| 123 | |
| 124 return(0); | |
| 125 } | |
| 126 | |
| 127 void SDL_SYS_TimerQuit(void) | |
| 128 { | |
| 129 /* We don't need a cleanup? */ | |
| 130 return; | |
| 131 } | |
| 132 | |
| 133 /* Our Stub routine to set up and then call the real routine. */ | |
| 134 pascal void TimerCallbackProc(TMTaskPtr tmTaskPtr) | |
| 135 { | |
| 136 Uint32 ms; | |
| 137 | |
| 138 WakeUpProcess(&((ExtendedTimerPtr) tmTaskPtr)->taskPSN); | |
| 139 | |
| 140 ms = SDL_alarm_callback(SDL_alarm_interval); | |
| 141 if ( ms ) { | |
| 142 SDL_alarm_interval = ROUND_RESOLUTION(ms); | |
| 143 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, | |
| 144 SDL_alarm_interval); | |
| 145 } else { | |
| 146 SDL_alarm_interval = 0; | |
| 147 } | |
| 148 } | |
| 149 | |
| 150 int SDL_SYS_StartTimer(void) | |
| 151 { | |
| 152 /* | |
| 153 * Configure the global structure that stores the timing information. | |
| 154 */ | |
| 155 gExtendedTimerRec.tmTask.qLink = NULL; | |
| 156 gExtendedTimerRec.tmTask.qType = 0; | |
| 157 gExtendedTimerRec.tmTask.tmAddr = NewTimerProc(TimerCallbackProc); | |
| 158 gExtendedTimerRec.tmTask.tmCount = 0; | |
| 159 gExtendedTimerRec.tmTask.tmWakeUp = 0; | |
| 160 gExtendedTimerRec.tmTask.tmReserved = 0; | |
| 161 GetCurrentProcess(&gExtendedTimerRec.taskPSN); | |
| 162 | |
| 163 /* Install the task record */ | |
| 164 InsXTime((QElemPtr)&gExtendedTimerRec.tmTask); | |
| 165 | |
| 166 /* Go! */ | |
| 167 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, SDL_alarm_interval); | |
| 168 return(0); | |
| 169 } | |
| 170 | |
| 171 void SDL_SYS_StopTimer(void) | |
| 172 { | |
| 173 RmvTime((QElemPtr)&gExtendedTimerRec.tmTask); | |
| 174 } |