Mercurial > sdl-ios-xcode
view 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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/* 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 */