Mercurial > sdl-ios-xcode
diff src/timer/win32/SDL_systimer.c @ 0:74212992fb08
Initial revision
author | Sam Lantinga <slouken@lokigames.com> |
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date | Thu, 26 Apr 2001 16:45:43 +0000 |
parents | |
children | 69b8fac3e1c0 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/timer/win32/SDL_systimer.c Thu Apr 26 16:45:43 2001 +0000 @@ -0,0 +1,181 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public + License as published by the Free Software Foundation; either + version 2 of the License, or (at your option) any later version. + + 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this library; if not, write to the Free + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + Sam Lantinga + slouken@devolution.com +*/ + +#ifdef SAVE_RCSID +static char rcsid = + "@(#) $Id$"; +#endif + +#include <windows.h> +#include <mmsystem.h> + +#include "SDL_timer.h" +#include "SDL_timer_c.h" +#include "SDL_error.h" + +#ifdef _WIN32_WCE +#define USE_GETTICKCOUNT +#define USE_SETTIMER +#endif + +#define TIME_WRAP_VALUE (~(DWORD)0) + +/* The first ticks value of the application */ +static DWORD start; + +void SDL_StartTicks(void) +{ + /* Set first ticks value */ +#ifdef USE_GETTICKCOUNT + start = GetTickCount(); +#else + start = timeGetTime(); +#endif +} + +Uint32 SDL_GetTicks(void) +{ + DWORD now, ticks; + +#ifdef USE_GETTICKCOUNT + now = GetTickCount(); +#else + now = timeGetTime(); +#endif + if ( now < start ) { + ticks = (TIME_WRAP_VALUE-start) + now; + } else { + ticks = (now - start); + } + return(ticks); +} + +void SDL_Delay(Uint32 ms) +{ + Sleep(ms); +} + +#ifdef USE_SETTIMER + +static UINT WIN_timer; + +int SDL_SYS_TimerInit(void) +{ + return(0); +} + +void SDL_SYS_TimerQuit(void) +{ + return; +} + +/* Forward declaration because this is called by the timer callback */ +int SDL_SYS_StartTimer(void); + +static VOID CALLBACK TimerCallbackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime) +{ + Uint32 ms; + + ms = SDL_alarm_callback(SDL_alarm_interval); + if ( ms != SDL_alarm_interval ) { + KillTimer(NULL, idEvent); + if ( ms ) { + SDL_alarm_interval = ROUND_RESOLUTION(ms); + SDL_SYS_StartTimer(); + } else { + SDL_alarm_interval = 0; + } + } +} + +int SDL_SYS_StartTimer(void) +{ + int retval; + + WIN_timer = SetTimer(NULL, 0, SDL_alarm_interval, TimerCallbackProc); + if ( WIN_timer ) { + retval = 0; + } else { + retval = -1; + } + return retval; +} + +void SDL_SYS_StopTimer(void) +{ + if ( WIN_timer ) { + KillTimer(NULL, WIN_timer); + WIN_timer = 0; + } +} + +#else /* !USE_SETTIMER */ + +/* Data to handle a single periodic alarm */ +static UINT timerID = 0; + +static void CALLBACK HandleAlarm(UINT uID, UINT uMsg, DWORD dwUser, + DWORD dw1, DWORD dw2) +{ + SDL_ThreadedTimerCheck(); +} + + +int SDL_SYS_TimerInit(void) +{ + 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)); +} + +void SDL_SYS_TimerQuit(void) +{ + if ( timerID ) { + timeKillEvent(timerID); + } + timeEndPeriod(TIMER_RESOLUTION); +} + +int SDL_SYS_StartTimer(void) +{ + SDL_SetError("Internal logic error: Win32 uses threaded timer"); + return(-1); +} + +void SDL_SYS_StopTimer(void) +{ + return; +} + +#endif /* USE_SETTIMER */