| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 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 |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | #ifdef SDL_TIMER_MACOS |
| 25 | |
| 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" |
| 35 | #include "../SDL_timer_c.h" |
| 36 | |
| 37 | #include "FastTimes.h" |
| 38 | |
| 39 | #if TARGET_API_MAC_CARBON |
| 40 | #define NewTimerProc NewTimerUPP |
| 41 | #endif |
| 42 | |
| 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 { |
| 74 | #if TARGET_API_MAC_CARBON |
| 75 | MPYield(); |
| 76 | #else |
| 77 | SystemTask(); |
| 78 | #endif |
| 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 | } |
| 185 | |
| 186 | #endif /* SDL_TIMER_MACOS */ |