Mercurial > sdl-ios-xcode
annotate src/timer/macos/SDL_systimer.c @ 1355:4d0f2b2147cf
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 10 Feb 2006 03:00:38 +0000 |
| parents | c9b51268668f |
| children | 19418e4422cb |
| rev | line source |
|---|---|
| 0 | 1 /* |
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1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
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2 SDL - Simple DirectMedia Layer |
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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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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
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Sam Lantinga <slouken@libsdl.org>
parents:
769
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changeset
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5 This library is free software; you can redistribute it and/or |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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6 modify it under the terms of the GNU Lesser General Public |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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7 License as published by the Free Software Foundation; either |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
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Sam Lantinga <slouken@libsdl.org>
parents:
769
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10 This library is distributed in the hope that it will be useful, |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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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:
769
diff
changeset
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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13 Lesser General Public License for more details. |
| 0 | 14 |
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Sam Lantinga <slouken@libsdl.org>
parents:
769
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changeset
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15 You should have received a copy of the GNU Lesser General Public |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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16 License along with this library; if not, write to the Free Software |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
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c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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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
diff
changeset
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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
diff
changeset
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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" | |
| 32 #include "SDL_timer_c.h" | |
| 33 | |
| 34 #include "FastTimes.h" | |
| 35 | |
| 36 #define MS_PER_TICK (1000.0/60.0) /* MacOS tick = 1/60 second */ | |
| 37 | |
| 38 | |
| 39 #define kTwoPower32 (4294967296.0) /* 2^32 */ | |
| 40 | |
| 41 static double start_tick; | |
| 42 static int is_fast_inited = 0; | |
| 43 | |
| 44 void SDL_StartTicks(void) | |
| 45 { | |
| 46 if ( ! is_fast_inited ) // important to check or FastTime may hang machine! | |
| 47 SDL_SYS_TimerInit(); | |
| 48 | |
| 49 start_tick = FastMicroseconds(); | |
| 50 } | |
| 51 | |
| 52 Uint32 SDL_GetTicks(void) | |
| 53 { | |
| 54 | |
| 55 if ( ! is_fast_inited ) | |
| 56 SDL_SYS_TimerInit(); | |
| 57 | |
| 58 return FastMilliseconds(); | |
| 59 } | |
| 60 | |
| 61 void SDL_Delay(Uint32 ms) | |
| 62 { | |
| 63 Uint32 stop, now; | |
| 64 | |
| 65 stop = SDL_GetTicks() + ms; | |
| 66 do { | |
| 67 SystemTask(); | |
| 68 | |
| 69 now = SDL_GetTicks(); | |
| 70 | |
| 71 } while ( stop > now ); | |
| 72 } | |
| 73 | |
| 74 /* | |
| 75 void SDL_StartTicks(void) | |
| 76 { | |
| 77 // FIXME: Should we implement a wrapping algorithm, like Win32? | |
| 78 } | |
| 79 | |
| 80 Uint32 SDL_GetTicks(void) | |
| 81 { | |
| 82 UnsignedWide ms; | |
| 83 | |
| 84 Microseconds (&ms); | |
| 85 | |
| 86 return ( ms.lo / 1000 ); | |
| 87 } | |
| 88 | |
| 89 void SDL_Delay(Uint32 ms) | |
| 90 { | |
| 91 | |
| 92 UnsignedWide microsecs; | |
| 93 UInt32 stop; | |
| 94 | |
| 95 Microseconds (µsecs); | |
| 96 | |
| 97 stop = microsecs.lo + (ms * 1000); | |
| 98 | |
| 99 while ( stop > microsecs.lo ) { | |
| 100 | |
| 101 SystemTask (); | |
| 102 | |
| 103 Microseconds (µsecs); | |
| 104 } | |
| 105 | |
| 106 }*/ | |
| 107 | |
| 108 /* Data to handle a single periodic alarm */ | |
| 109 typedef struct _ExtendedTimerRec | |
| 110 { | |
| 111 TMTask tmTask; | |
| 112 ProcessSerialNumber taskPSN; | |
| 113 } ExtendedTimerRec, *ExtendedTimerPtr; | |
| 114 | |
| 115 static ExtendedTimerRec gExtendedTimerRec; | |
| 116 | |
| 117 | |
| 118 int SDL_SYS_TimerInit(void) | |
| 119 { | |
| 120 FastInitialize (); | |
| 121 is_fast_inited = 1; | |
| 122 | |
| 123 return(0); | |
| 124 } | |
| 125 | |
| 126 void SDL_SYS_TimerQuit(void) | |
| 127 { | |
| 128 /* We don't need a cleanup? */ | |
| 129 return; | |
| 130 } | |
| 131 | |
| 132 /* Our Stub routine to set up and then call the real routine. */ | |
| 133 pascal void TimerCallbackProc(TMTaskPtr tmTaskPtr) | |
| 134 { | |
| 135 Uint32 ms; | |
| 136 | |
| 137 WakeUpProcess(&((ExtendedTimerPtr) tmTaskPtr)->taskPSN); | |
| 138 | |
| 139 ms = SDL_alarm_callback(SDL_alarm_interval); | |
| 140 if ( ms ) { | |
| 141 SDL_alarm_interval = ROUND_RESOLUTION(ms); | |
| 142 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, | |
| 143 SDL_alarm_interval); | |
| 144 } else { | |
| 145 SDL_alarm_interval = 0; | |
| 146 } | |
| 147 } | |
| 148 | |
| 149 int SDL_SYS_StartTimer(void) | |
| 150 { | |
| 151 /* | |
| 152 * Configure the global structure that stores the timing information. | |
| 153 */ | |
| 154 gExtendedTimerRec.tmTask.qLink = NULL; | |
| 155 gExtendedTimerRec.tmTask.qType = 0; | |
| 156 gExtendedTimerRec.tmTask.tmAddr = NewTimerProc(TimerCallbackProc); | |
| 157 gExtendedTimerRec.tmTask.tmCount = 0; | |
| 158 gExtendedTimerRec.tmTask.tmWakeUp = 0; | |
| 159 gExtendedTimerRec.tmTask.tmReserved = 0; | |
| 160 GetCurrentProcess(&gExtendedTimerRec.taskPSN); | |
| 161 | |
| 162 /* Install the task record */ | |
| 163 InsXTime((QElemPtr)&gExtendedTimerRec.tmTask); | |
| 164 | |
| 165 /* Go! */ | |
| 166 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, SDL_alarm_interval); | |
| 167 return(0); | |
| 168 } | |
| 169 | |
| 170 void SDL_SYS_StopTimer(void) | |
| 171 { | |
| 172 RmvTime((QElemPtr)&gExtendedTimerRec.tmTask); | |
| 173 } |