Mercurial > sdl-ios-xcode
annotate src/timer/macos/SDL_MPWtimer.c @ 1399:c35c161a1100
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 20 Feb 2006 23:18:49 +0000 |
| parents | 19418e4422cb |
| children | d910939febfa |
| rev | line source |
|---|---|
| 0 | 1 /* |
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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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Sam Lantinga <slouken@libsdl.org>
parents:
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5 This library is free software; you can redistribute it and/or |
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c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
parents:
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6 modify it under the terms of the GNU Lesser General Public |
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c9b51268668f
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7 License as published by the Free Software Foundation; either |
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c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
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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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c9b51268668f
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
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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Sam Lantinga <slouken@libsdl.org>
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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Sam Lantinga <slouken@libsdl.org>
parents:
769
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19 Sam Lantinga |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
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20 slouken@libsdl.org |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
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21 */ |
| 0 | 22 |
| 23 #include <Types.h> | |
| 24 #include <Timer.h> | |
| 25 #include <OSUtils.h> | |
| 26 #include <Gestalt.h> | |
| 27 #include <Processes.h> | |
| 28 | |
| 29 #include <LowMem.h> | |
| 30 | |
| 31 #include "SDL_timer.h" | |
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32 #include "../SDL_timer_c.h" |
| 0 | 33 |
| 34 #define MS_PER_TICK (1000/60) /* MacOS tick = 1/60 second */ | |
| 35 | |
| 36 /* Note: This is only a step above the original 1/60s implementation. | |
| 37 * For a good implementation, see FastTimes.[ch], by Matt Slot. | |
| 38 */ | |
| 39 #define USE_MICROSECONDS | |
| 40 #define WideTo64bit(w) (*(UInt64 *) &(w)) | |
| 41 | |
| 42 UInt64 start; | |
| 43 | |
| 44 void SDL_StartTicks(void) | |
| 45 { | |
| 46 #ifdef USE_MICROSECONDS | |
| 47 UnsignedWide now; | |
| 48 | |
| 49 Microseconds(&now); | |
| 50 start = WideTo64bit(now); | |
| 51 #else | |
| 52 /* FIXME: Should we implement a wrapping algorithm, like Win32? */ | |
| 53 #endif | |
| 54 } | |
| 55 | |
| 56 Uint32 SDL_GetTicks(void) | |
| 57 { | |
| 58 #ifdef USE_MICROSECONDS | |
| 59 UnsignedWide now; | |
| 60 | |
| 61 Microseconds(&now); | |
| 62 return (Uint32)((WideTo64bit(now)-start)/1000); | |
| 63 #else | |
| 64 return(LMGetTicks()*MS_PER_TICK); | |
| 65 #endif | |
| 66 } | |
| 67 | |
| 68 void SDL_Delay(Uint32 ms) | |
| 69 { | |
| 70 #ifdef USE_MICROSECONDS | |
| 71 Uint32 end_ms; | |
| 72 | |
| 73 end_ms = SDL_GetTicks() + ms; | |
| 74 do { | |
| 75 /* FIXME: Yield CPU? */ ; | |
| 76 } while ( SDL_GetTicks() < end_ms ); | |
| 77 #else | |
| 78 UInt32 unused; /* MJS */ | |
| 79 Delay(ms/MS_PER_TICK, &unused); | |
| 80 #endif | |
| 81 } | |
| 82 | |
| 83 | |
| 84 /* Data to handle a single periodic alarm */ | |
| 85 typedef struct _ExtendedTimerRec | |
| 86 { | |
| 87 TMTask tmTask; | |
| 88 ProcessSerialNumber taskPSN; | |
| 89 } ExtendedTimerRec, *ExtendedTimerPtr; | |
| 90 | |
| 91 static ExtendedTimerRec gExtendedTimerRec; | |
| 92 | |
| 93 | |
| 94 int SDL_SYS_TimerInit(void) | |
| 95 { | |
| 96 /* We don't need a setup? */ | |
| 97 return(0); | |
| 98 } | |
| 99 | |
| 100 void SDL_SYS_TimerQuit(void) | |
| 101 { | |
| 102 /* We don't need a cleanup? */ | |
| 103 return; | |
| 104 } | |
| 105 | |
| 106 /* Our Stub routine to set up and then call the real routine. */ | |
| 107 pascal void TimerCallbackProc(TMTaskPtr tmTaskPtr) | |
| 108 { | |
| 109 Uint32 ms; | |
| 110 | |
| 111 WakeUpProcess(&((ExtendedTimerPtr) tmTaskPtr)->taskPSN); | |
| 112 | |
| 113 ms = SDL_alarm_callback(SDL_alarm_interval); | |
| 114 if ( ms ) { | |
| 115 SDL_alarm_interval = ROUND_RESOLUTION(ms); | |
| 116 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, | |
| 117 SDL_alarm_interval); | |
| 118 } else { | |
| 119 SDL_alarm_interval = 0; | |
| 120 } | |
| 121 } | |
| 122 | |
| 123 int SDL_SYS_StartTimer(void) | |
| 124 { | |
| 125 /* | |
| 126 * Configure the global structure that stores the timing information. | |
| 127 */ | |
| 128 gExtendedTimerRec.tmTask.qLink = NULL; | |
| 129 gExtendedTimerRec.tmTask.qType = 0; | |
| 130 gExtendedTimerRec.tmTask.tmAddr = NewTimerUPP(TimerCallbackProc); | |
| 131 gExtendedTimerRec.tmTask.tmCount = 0; | |
| 132 gExtendedTimerRec.tmTask.tmWakeUp = 0; | |
| 133 gExtendedTimerRec.tmTask.tmReserved = 0; | |
| 134 GetCurrentProcess(&gExtendedTimerRec.taskPSN); | |
| 135 | |
| 136 /* Install the task record */ | |
| 137 InsXTime((QElemPtr)&gExtendedTimerRec.tmTask); | |
| 138 | |
| 139 /* Go! */ | |
| 140 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, SDL_alarm_interval); | |
| 141 return(0); | |
| 142 } | |
| 143 | |
| 144 void SDL_SYS_StopTimer(void) | |
| 145 { | |
| 146 RmvTime((QElemPtr)&gExtendedTimerRec.tmTask); | |
| 147 } |