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SDL_systimer.c
211 lines (174 loc) · 4.62 KB
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
slouken@libsdl.org
*/
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#include "SDL_config.h"
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#ifdef SDL_TIMER_WINCE
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#define WIN32_LEAN_AND_MEAN
#include <windows.h>
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#include <mmsystem.h>
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#include "SDL_thread.h"
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#include "SDL_timer.h"
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#include "../SDL_timer_c.h"
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static Uint64 start_date;
static Uint64 start_ticks;
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static Uint64
wce_ticks(void)
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{
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return ((Uint64) GetTickCount());
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}
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static Uint64
wce_date(void)
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{
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union
{
FILETIME ftime;
Uint64 itime;
} ftime;
SYSTEMTIME stime;
GetSystemTime(&stime);
SystemTimeToFileTime(&stime, &ftime.ftime);
ftime.itime /= 10000; // Convert 100ns intervals to 1ms intervals
// Remove ms portion, which can't be relied on
ftime.itime -= (ftime.itime % 1000);
return (ftime.itime);
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}
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static Sint32
wce_rel_ticks(void)
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{
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return ((Sint32) (wce_ticks() - start_ticks));
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}
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static Sint32
wce_rel_date(void)
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{
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return ((Sint32) (wce_date() - start_date));
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}
/* Return time in ms relative to when SDL was started */
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Uint32
SDL_GetTicks()
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{
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Sint32 offset = wce_rel_date() - wce_rel_ticks();
if ((offset < -1000) || (offset > 1000)) {
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// fprintf(stderr,"Time desync(%+d), resyncing\n",offset/1000);
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start_ticks -= offset;
}
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return ((Uint32) wce_rel_ticks());
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}
/* Give up approx. givem milliseconds to the OS. */
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void
SDL_Delay(Uint32 ms)
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{
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Sleep(ms);
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}
/* Recard start-time of application for reference */
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void
SDL_StartTicks(void)
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{
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start_date = wce_date();
start_ticks = wce_ticks();
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}
static UINT WIN_timer;
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#if ( _WIN32_WCE <= 420 )
static HANDLE timersThread = 0;
static HANDLE timersQuitEvent = 0;
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DWORD
TimersThreadProc(void *data)
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{
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while (WaitForSingleObject(timersQuitEvent, 10) == WAIT_TIMEOUT) {
SDL_ThreadedTimerCheck();
}
return 0;
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}
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int
SDL_SYS_TimerInit(void)
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{
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// create a thread to process a threaded timers
// SetTimer does not suit the needs because
// TimerCallbackProc will be called only when WM_TIMER occured
timersQuitEvent = CreateEvent(0, TRUE, FALSE, 0);
if (!timersQuitEvent) {
SDL_SetError("Cannot create event for timers thread");
return -1;
}
timersThread = CreateThread(NULL, 0, TimersThreadProc, 0, 0, 0);
if (!timersThread) {
SDL_SetError
("Cannot create timers thread, check amount of RAM available");
return -1;
}
SetThreadPriority(timersThread, THREAD_PRIORITY_HIGHEST);
return (SDL_SetTimerThreaded(1));
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}
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void
SDL_SYS_TimerQuit(void)
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{
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SetEvent(timersQuitEvent);
if (WaitForSingleObject(timersThread, 2000) == WAIT_TIMEOUT)
TerminateThread(timersThread, 0);
CloseHandle(timersThread);
CloseHandle(timersQuitEvent);
return;
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}
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#else
#pragma comment(lib, "mmtimer.lib")
/* Data to handle a single periodic alarm */
static UINT timerID = 0;
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static void CALLBACK
HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2)
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{
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SDL_ThreadedTimerCheck();
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}
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int
SDL_SYS_TimerInit(void)
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{
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MMRESULT result;
/* Set timer resolution */
result = timeBeginPeriod(TIMER_RESOLUTION);
if (result != TIMERR_NOERROR) {
SDL_SetError("Warning: Can't set %d ms timer resolution",
TIMER_RESOLUTION);
}
/* Allow 10 ms of drift so we don't chew on CPU */
timerID =
timeSetEvent(TIMER_RESOLUTION, 1, HandleAlarm, 0, TIME_PERIODIC);
if (!timerID) {
SDL_SetError("timeSetEvent() failed");
return (-1);
}
return (SDL_SetTimerThreaded(1));
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}
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void
SDL_SYS_TimerQuit(void)
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{
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if (timerID) {
timeKillEvent(timerID);
}
timeEndPeriod(TIMER_RESOLUTION);
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}
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#endif
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int
SDL_SYS_StartTimer(void)
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{
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SDL_SetError("Internal logic error: WinCE uses threaded timer");
return (-1);
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}
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void
SDL_SYS_StopTimer(void)
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{
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return;
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}
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#endif /* SDL_TIMER_WINCE */
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/* vi: set ts=4 sw=4 expandtab: */