Initial revision

--HG-- extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401
2001-04-26 16:45:43 +00:00 · 2001-04-26 16:45:43 +00:00 · 2f110628a7
commit 2f110628a7
892 changed files with 170313 additions and 0 deletions
--- a/src/timer/win32/SDL_systimer.c
+++ b/src/timer/win32/SDL_systimer.c
@ -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 */