| 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_WINCE |
| 25 | |
| 26 | #define WIN32_LEAN_AND_MEAN |
| 27 | #include <windows.h> |
| 28 | #include <mmsystem.h> |
| 29 | |
| 30 | #include "SDL_thread.h" |
| 31 | #include "SDL_timer.h" |
| 32 | #include "../SDL_timer_c.h" |
| 33 | |
| 34 | static Uint64 start_date; |
| 35 | static Uint64 start_ticks; |
| 36 | |
| 37 | static Uint64 wce_ticks(void) |
| 38 | { |
| 39 | return((Uint64)GetTickCount()); |
| 40 | } |
| 41 | |
| 42 | static Uint64 wce_date(void) |
| 43 | { |
| 44 | union |
| 45 | { |
| 46 | FILETIME ftime; |
| 47 | Uint64 itime; |
| 48 | } ftime; |
| 49 | SYSTEMTIME stime; |
| 50 | |
| 51 | GetSystemTime(&stime); |
| 52 | SystemTimeToFileTime(&stime,&ftime.ftime); |
| 53 | ftime.itime/=10000; // Convert 100ns intervals to 1ms intervals |
| 54 | // Remove ms portion, which can't be relied on |
| 55 | ftime.itime -= (ftime.itime % 1000); |
| 56 | return(ftime.itime); |
| 57 | } |
| 58 | |
| 59 | static Sint32 wce_rel_ticks(void) |
| 60 | { |
| 61 | return((Sint32)(wce_ticks()-start_ticks)); |
| 62 | } |
| 63 | |
| 64 | static Sint32 wce_rel_date(void) |
| 65 | { |
| 66 | return((Sint32)(wce_date()-start_date)); |
| 67 | } |
| 68 | |
| 69 | /* Return time in ms relative to when SDL was started */ |
| 70 | Uint32 SDL_GetTicks() |
| 71 | { |
| 72 | Sint32 offset=wce_rel_date()-wce_rel_ticks(); |
| 73 | if((offset < -1000) || (offset > 1000)) |
| 74 | { |
| 75 | // fprintf(stderr,"Time desync(%+d), resyncing\n",offset/1000); |
| 76 | start_ticks-=offset; |
| 77 | } |
| 78 | |
| 79 | return((Uint32)wce_rel_ticks()); |
| 80 | } |
| 81 | |
| 82 | /* Give up approx. givem milliseconds to the OS. */ |
| 83 | void SDL_Delay(Uint32 ms) |
| 84 | { |
| 85 | Sleep(ms); |
| 86 | } |
| 87 | |
| 88 | /* Recard start-time of application for reference */ |
| 89 | void SDL_StartTicks(void) |
| 90 | { |
| 91 | start_date=wce_date(); |
| 92 | start_ticks=wce_ticks(); |
| 93 | } |
| 94 | |
| 95 | static UINT WIN_timer; |
| 96 | |
| 97 | #if ( _WIN32_WCE <= 420 ) |
| 98 | |
| 99 | static HANDLE timersThread = 0; |
| 100 | static HANDLE timersQuitEvent = 0; |
| 101 | |
| 102 | DWORD TimersThreadProc(void *data) |
| 103 | { |
| 104 | while(WaitForSingleObject(timersQuitEvent, 10) == WAIT_TIMEOUT) |
| 105 | { |
| 106 | SDL_ThreadedTimerCheck(); |
| 107 | } |
| 108 | return 0; |
| 109 | } |
| 110 | |
| 111 | int SDL_SYS_TimerInit(void) |
| 112 | { |
| 113 | // create a thread to process a threaded timers |
| 114 | // SetTimer does not suit the needs because |
| 115 | // TimerCallbackProc will be called only when WM_TIMER occured |
| 116 | |
| 117 | timersQuitEvent = CreateEvent(0, TRUE, FALSE, 0); |
| 118 | if( !timersQuitEvent ) |
| 119 | { |
| 120 | SDL_SetError("Cannot create event for timers thread"); |
| 121 | return -1; |
| 122 | } |
| 123 | timersThread = CreateThread(NULL, 0, TimersThreadProc, 0, 0, 0); |
| 124 | if( !timersThread ) |
| 125 | { |
| 126 | SDL_SetError("Cannot create timers thread, check amount of RAM available"); |
| 127 | return -1; |
| 128 | } |
| 129 | SetThreadPriority(timersThread, THREAD_PRIORITY_HIGHEST); |
| 130 | |
| 131 | return(SDL_SetTimerThreaded(1)); |
| 132 | } |
| 133 | |
| 134 | void SDL_SYS_TimerQuit(void) |
| 135 | { |
| 136 | SetEvent(timersQuitEvent); |
| 137 | if( WaitForSingleObject(timersThread, 2000) == WAIT_TIMEOUT ) |
| 138 | TerminateThread(timersThread, 0); |
| 139 | CloseHandle(timersThread); |
| 140 | CloseHandle(timersQuitEvent); |
| 141 | return; |
| 142 | } |
| 143 | |
| 144 | #else |
| 145 | |
| 146 | #pragma comment(lib, "mmtimer.lib") |
| 147 | |
| 148 | /* Data to handle a single periodic alarm */ |
| 149 | static UINT timerID = 0; |
| 150 | |
| 151 | static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser, |
| 152 | DWORD dw1, DWORD dw2) |
| 153 | { |
| 154 | SDL_ThreadedTimerCheck(); |
| 155 | } |
| 156 | |
| 157 | |
| 158 | int SDL_SYS_TimerInit(void) |
| 159 | { |
| 160 | MMRESULT result; |
| 161 | |
| 162 | /* Set timer resolution */ |
| 163 | result = timeBeginPeriod(TIMER_RESOLUTION); |
| 164 | if ( result != TIMERR_NOERROR ) { |
| 165 | SDL_SetError("Warning: Can't set %d ms timer resolution", |
| 166 | TIMER_RESOLUTION); |
| 167 | } |
| 168 | /* Allow 10 ms of drift so we don't chew on CPU */ |
| 169 | timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC); |
| 170 | if ( ! timerID ) { |
| 171 | SDL_SetError("timeSetEvent() failed"); |
| 172 | return(-1); |
| 173 | } |
| 174 | return(SDL_SetTimerThreaded(1)); |
| 175 | } |
| 176 | |
| 177 | void SDL_SYS_TimerQuit(void) |
| 178 | { |
| 179 | if ( timerID ) { |
| 180 | timeKillEvent(timerID); |
| 181 | } |
| 182 | timeEndPeriod(TIMER_RESOLUTION); |
| 183 | } |
| 184 | |
| 185 | #endif |
| 186 | |
| 187 | int SDL_SYS_StartTimer(void) |
| 188 | { |
| 189 | SDL_SetError("Internal logic error: WinCE uses threaded timer"); |
| 190 | return(-1); |
| 191 | } |
| 192 | |
| 193 | void SDL_SYS_StopTimer(void) |
| 194 | { |
| 195 | return; |
| 196 | } |
| 197 | |
| 198 | #endif /* SDL_TIMER_WINCE */ |