src/timer/win32/SDL_systimer.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 07 Oct 2002 15:19:17 +0000
changeset 517 621ab54c1dde
parent 453 a6fa62b1be09
child 769 b8d311d90021
permissions -rw-r--r--
Fixed building timer code on Windows CE
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  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 Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 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,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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#include <windows.h>
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#include <mmsystem.h>
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#include "SDL_timer.h"
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#include "SDL_timer_c.h"
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#include "SDL_error.h"
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#ifdef _WIN32_WCE
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#define USE_GETTICKCOUNT
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#define USE_SETTIMER
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#endif
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#define TIME_WRAP_VALUE	(~(DWORD)0)
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/* The first (low-resolution) ticks value of the application */
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static DWORD start;
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#ifndef USE_GETTICKCOUNT
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/* Store if a high-resolution performance counter exists on the system */
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static BOOL hires_timer_available;
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/* The first high-resolution ticks value of the application */
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static LARGE_INTEGER hires_start_ticks;
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/* The number of ticks per second of the high-resolution performance counter */
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static LARGE_INTEGER hires_ticks_per_second;
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#endif
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void SDL_StartTicks(void)
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{
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	/* Set first ticks value */
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#ifdef USE_GETTICKCOUNT
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	start = GetTickCount();
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#else
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#if 0 /* Apparently there are problems with QPC on Win2K */
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	if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE)
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	{
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		hires_timer_available = TRUE;
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		QueryPerformanceCounter(&hires_start_ticks);
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	}
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	else
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#endif
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	{
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		hires_timer_available = FALSE;
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		timeBeginPeriod(1);		/* use 1 ms timer precision */
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		start = timeGetTime();
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	}
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#endif
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}
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Uint32 SDL_GetTicks(void)
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{
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	DWORD now, ticks;
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#ifndef USE_GETTICKCOUNT
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	LARGE_INTEGER hires_now;
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#endif
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#ifdef USE_GETTICKCOUNT
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	now = GetTickCount();
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#else
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	if (hires_timer_available)
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	{
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		QueryPerformanceCounter(&hires_now);
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		hires_now.QuadPart -= hires_start_ticks.QuadPart;
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		hires_now.QuadPart *= 1000;
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		hires_now.QuadPart /= hires_ticks_per_second.QuadPart;
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		return (DWORD)hires_now.QuadPart;
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	}
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	else
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	{
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		now = timeGetTime();
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	}
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#endif
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0
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	if ( now < start ) {
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		ticks = (TIME_WRAP_VALUE-start) + now;
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	} else {
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		ticks = (now - start);
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	}
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	return(ticks);
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}
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void SDL_Delay(Uint32 ms)
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{
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	Sleep(ms);
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}
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#ifdef USE_SETTIMER
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static UINT WIN_timer;
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int SDL_SYS_TimerInit(void)
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{
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	return(0);
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}
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void SDL_SYS_TimerQuit(void)
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{
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	return;
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}
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/* Forward declaration because this is called by the timer callback */
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int SDL_SYS_StartTimer(void);
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static VOID CALLBACK TimerCallbackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime)
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{
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	Uint32 ms;
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	ms = SDL_alarm_callback(SDL_alarm_interval);
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	if ( ms != SDL_alarm_interval ) {
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		KillTimer(NULL, idEvent);
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		if ( ms ) {
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			SDL_alarm_interval = ROUND_RESOLUTION(ms);
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			SDL_SYS_StartTimer();
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		} else {
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			SDL_alarm_interval = 0;
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		}
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	}
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}
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int SDL_SYS_StartTimer(void)
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{
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	int retval;
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	WIN_timer = SetTimer(NULL, 0, SDL_alarm_interval, TimerCallbackProc);
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	if ( WIN_timer ) {
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		retval = 0;
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	} else {
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		retval = -1;
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	}
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	return retval;
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}
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void SDL_SYS_StopTimer(void)
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{
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	if ( WIN_timer ) {
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		KillTimer(NULL, WIN_timer);
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		WIN_timer = 0;
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	}
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}
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#else /* !USE_SETTIMER */
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/* Data to handle a single periodic alarm */
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static UINT timerID = 0;
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static void CALLBACK HandleAlarm(UINT uID,  UINT uMsg, DWORD dwUser,
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						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;
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	/* Set timer resolution */
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	result = timeBeginPeriod(TIMER_RESOLUTION);
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	if ( result != TIMERR_NOERROR ) {
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		SDL_SetError("Warning: Can't set %d ms timer resolution",
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							TIMER_RESOLUTION);
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	}
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	/* Allow 10 ms of drift so we don't chew on CPU */
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	timerID = timeSetEvent(TIMER_RESOLUTION,1,HandleAlarm,0,TIME_PERIODIC);
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	if ( ! timerID ) {
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		SDL_SetError("timeSetEvent() failed");
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		return(-1);
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	}
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	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 ) {
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		timeKillEvent(timerID);
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	}
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	timeEndPeriod(TIMER_RESOLUTION);
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}
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int SDL_SYS_StartTimer(void)
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{
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	SDL_SetError("Internal logic error: Win32 uses threaded timer");
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	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 /* USE_SETTIMER */