1/* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2012 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 34static Uint64 start_date; 35static Uint64 start_ticks; 36 37static Uint64 wce_ticks(void) 38{ 39 return((Uint64)GetTickCount()); 40} 41 42static 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 59static Sint32 wce_rel_ticks(void) 60{ 61 return((Sint32)(wce_ticks()-start_ticks)); 62} 63 64static 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 */ 70Uint32 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. */ 83void SDL_Delay(Uint32 ms) 84{ 85 Sleep(ms); 86} 87 88/* Recard start-time of application for reference */ 89void SDL_StartTicks(void) 90{ 91 start_date=wce_date(); 92 start_ticks=wce_ticks(); 93} 94 95static UINT WIN_timer; 96 97#if ( _WIN32_WCE <= 420 ) 98 99static HANDLE timersThread = 0; 100static HANDLE timersQuitEvent = 0; 101 102DWORD TimersThreadProc(void *data) 103{ 104 while(WaitForSingleObject(timersQuitEvent, 10) == WAIT_TIMEOUT) 105 { 106 SDL_ThreadedTimerCheck(); 107 } 108 return 0; 109} 110 111int 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 134void 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 */ 149static UINT timerID = 0; 150 151static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser, 152 DWORD dw1, DWORD dw2) 153{ 154 SDL_ThreadedTimerCheck(); 155} 156 157 158int 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 177void SDL_SYS_TimerQuit(void) 178{ 179 if ( timerID ) { 180 timeKillEvent(timerID); 181 } 182 timeEndPeriod(TIMER_RESOLUTION); 183} 184 185#endif 186 187int SDL_SYS_StartTimer(void) 188{ 189 SDL_SetError("Internal logic error: WinCE uses threaded timer"); 190 return(-1); 191} 192 193void SDL_SYS_StopTimer(void) 194{ 195 return; 196} 197 198#endif /* SDL_TIMER_WINCE */ 199