Added initial support for Dreamcast (thanks HERO!)

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40510

src/timer/Makefile.am

@@ -5,6 +5,7 @@ noinst_LTLIBRARIES = libtimer.la
 
 ARCH_SUBDIRS = $(srcdir)/amigaos \
                $(srcdir)/beos \
+               $(srcdir)/dc \
                $(srcdir)/epoc \
                $(srcdir)/linux \
                $(srcdir)/macos \

src/timer/dc/SDL_systimer.c

@@ -0,0 +1,106 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  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
+
+    BERO
+    bero@geocities.co.jp
+
+    based on win32/SDL_systimer.c
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+
+#ifdef SAVE_RCSID
+static char rcsid =
+ "@(#) $Id$";
+#endif
+
+#include <kos.h>
+
+#include "SDL_thread.h"
+#include "SDL_timer.h"
+#include "SDL_error.h"
+#include "SDL_timer_c.h"
+
+static unsigned start;
+
+/* 
+	jif =  ms * HZ /1000
+	ms  = jif * 1000/HZ
+*/
+
+void SDL_StartTicks(void)
+{
+	/* Set first ticks value */
+	start = jiffies;
+}
+
+Uint32 SDL_GetTicks(void)
+{
+	return((jiffies-start)*1000/HZ);
+}
+
+void SDL_Delay(Uint32 ms)
+{
+	thd_sleep(ms);
+}
+
+/* Data to handle a single periodic alarm */
+static int timer_alive = 0;
+static SDL_Thread *timer = NULL;
+
+static int RunTimer(void *unused)
+{
+	while ( timer_alive ) {
+		if ( SDL_timer_running ) {
+			SDL_ThreadedTimerCheck();
+		}
+		SDL_Delay(10);
+	}
+	return(0);
+}
+
+/* This is only called if the event thread is not running */
+int SDL_SYS_TimerInit(void)
+{
+	timer_alive = 1;
+	timer = SDL_CreateThread(RunTimer, NULL);
+	if ( timer == NULL )
+		return(-1);
+	return(SDL_SetTimerThreaded(1));
+}
+
+void SDL_SYS_TimerQuit(void)
+{
+	timer_alive = 0;
+	if ( timer ) {
+		SDL_WaitThread(timer, NULL);
+		timer = NULL;
+	}
+}
+
+int SDL_SYS_StartTimer(void)
+{
+	SDL_SetError("Internal logic error: DC uses threaded timer");
+	return(-1);
+}
+
+void SDL_SYS_StopTimer(void)
+{
+	return;
+}