Mercurial > sdl-ios-xcode
annotate src/timer/macos/SDL_systimer.c @ 3955:40b6b5744e05 SDL-1.2
Avoid switch to supervisor mode in SDL_GetTicks, by updating system counter from vbl interrupt
| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Sat, 09 Jun 2007 19:52:05 +0000 |
| parents | 1834c192d89f |
| children | c121d94672cb a1b03ba2fcd0 |
| 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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5 This library is free software; you can redistribute it and/or |
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c9b51268668f
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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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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
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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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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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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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19 Sam Lantinga |
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parents:
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20 slouken@libsdl.org |
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c9b51268668f
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21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
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24 #ifdef SDL_TIMER_MACOS |
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25 |
| 0 | 26 #include <Types.h> |
| 27 #include <Timer.h> | |
| 28 #include <OSUtils.h> | |
| 29 #include <Gestalt.h> | |
| 30 #include <Processes.h> | |
| 31 | |
| 32 #include <LowMem.h> | |
| 33 | |
| 34 #include "SDL_timer.h" | |
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New configure-based build system. Still work in progress, but much improved
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35 #include "../SDL_timer_c.h" |
| 0 | 36 |
| 37 #include "FastTimes.h" | |
| 38 | |
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39 #if TARGET_API_MAC_CARBON |
| 1810 | 40 #define NewTimerProc NewTimerUPP |
| 41 #endif | |
| 42 | |
| 0 | 43 #define MS_PER_TICK (1000.0/60.0) /* MacOS tick = 1/60 second */ |
| 44 | |
| 45 | |
| 46 #define kTwoPower32 (4294967296.0) /* 2^32 */ | |
| 47 | |
| 48 static double start_tick; | |
| 49 static int is_fast_inited = 0; | |
| 50 | |
| 51 void SDL_StartTicks(void) | |
| 52 { | |
| 53 if ( ! is_fast_inited ) // important to check or FastTime may hang machine! | |
| 54 SDL_SYS_TimerInit(); | |
| 55 | |
| 56 start_tick = FastMicroseconds(); | |
| 57 } | |
| 58 | |
| 59 Uint32 SDL_GetTicks(void) | |
| 60 { | |
| 61 | |
| 62 if ( ! is_fast_inited ) | |
| 63 SDL_SYS_TimerInit(); | |
| 64 | |
| 65 return FastMilliseconds(); | |
| 66 } | |
| 67 | |
| 68 void SDL_Delay(Uint32 ms) | |
| 69 { | |
| 70 Uint32 stop, now; | |
| 71 | |
| 72 stop = SDL_GetTicks() + ms; | |
| 73 do { | |
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74 #if TARGET_API_MAC_CARBON |
| 1810 | 75 MPYield(); |
| 76 #else | |
| 0 | 77 SystemTask(); |
| 1810 | 78 #endif |
| 0 | 79 |
| 80 now = SDL_GetTicks(); | |
| 81 | |
| 82 } while ( stop > now ); | |
| 83 } | |
| 84 | |
| 85 /* | |
| 86 void SDL_StartTicks(void) | |
| 87 { | |
| 88 // FIXME: Should we implement a wrapping algorithm, like Win32? | |
| 89 } | |
| 90 | |
| 91 Uint32 SDL_GetTicks(void) | |
| 92 { | |
| 93 UnsignedWide ms; | |
| 94 | |
| 95 Microseconds (&ms); | |
| 96 | |
| 97 return ( ms.lo / 1000 ); | |
| 98 } | |
| 99 | |
| 100 void SDL_Delay(Uint32 ms) | |
| 101 { | |
| 102 | |
| 103 UnsignedWide microsecs; | |
| 104 UInt32 stop; | |
| 105 | |
| 106 Microseconds (µsecs); | |
| 107 | |
| 108 stop = microsecs.lo + (ms * 1000); | |
| 109 | |
| 110 while ( stop > microsecs.lo ) { | |
| 111 | |
| 112 SystemTask (); | |
| 113 | |
| 114 Microseconds (µsecs); | |
| 115 } | |
| 116 | |
| 117 }*/ | |
| 118 | |
| 119 /* Data to handle a single periodic alarm */ | |
| 120 typedef struct _ExtendedTimerRec | |
| 121 { | |
| 122 TMTask tmTask; | |
| 123 ProcessSerialNumber taskPSN; | |
| 124 } ExtendedTimerRec, *ExtendedTimerPtr; | |
| 125 | |
| 126 static ExtendedTimerRec gExtendedTimerRec; | |
| 127 | |
| 128 | |
| 129 int SDL_SYS_TimerInit(void) | |
| 130 { | |
| 131 FastInitialize (); | |
| 132 is_fast_inited = 1; | |
| 133 | |
| 134 return(0); | |
| 135 } | |
| 136 | |
| 137 void SDL_SYS_TimerQuit(void) | |
| 138 { | |
| 139 /* We don't need a cleanup? */ | |
| 140 return; | |
| 141 } | |
| 142 | |
| 143 /* Our Stub routine to set up and then call the real routine. */ | |
| 144 pascal void TimerCallbackProc(TMTaskPtr tmTaskPtr) | |
| 145 { | |
| 146 Uint32 ms; | |
| 147 | |
| 148 WakeUpProcess(&((ExtendedTimerPtr) tmTaskPtr)->taskPSN); | |
| 149 | |
| 150 ms = SDL_alarm_callback(SDL_alarm_interval); | |
| 151 if ( ms ) { | |
| 152 SDL_alarm_interval = ROUND_RESOLUTION(ms); | |
| 153 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, | |
| 154 SDL_alarm_interval); | |
| 155 } else { | |
| 156 SDL_alarm_interval = 0; | |
| 157 } | |
| 158 } | |
| 159 | |
| 160 int SDL_SYS_StartTimer(void) | |
| 161 { | |
| 162 /* | |
| 163 * Configure the global structure that stores the timing information. | |
| 164 */ | |
| 165 gExtendedTimerRec.tmTask.qLink = NULL; | |
| 166 gExtendedTimerRec.tmTask.qType = 0; | |
| 167 gExtendedTimerRec.tmTask.tmAddr = NewTimerProc(TimerCallbackProc); | |
| 168 gExtendedTimerRec.tmTask.tmCount = 0; | |
| 169 gExtendedTimerRec.tmTask.tmWakeUp = 0; | |
| 170 gExtendedTimerRec.tmTask.tmReserved = 0; | |
| 171 GetCurrentProcess(&gExtendedTimerRec.taskPSN); | |
| 172 | |
| 173 /* Install the task record */ | |
| 174 InsXTime((QElemPtr)&gExtendedTimerRec.tmTask); | |
| 175 | |
| 176 /* Go! */ | |
| 177 PrimeTime((QElemPtr)&gExtendedTimerRec.tmTask, SDL_alarm_interval); | |
| 178 return(0); | |
| 179 } | |
| 180 | |
| 181 void SDL_SYS_StopTimer(void) | |
| 182 { | |
| 183 RmvTime((QElemPtr)&gExtendedTimerRec.tmTask); | |
| 184 } | |
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185 |
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186 #endif /* SDL_TIMER_MACOS */ |