/*

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@libsdl.org

*/

#ifdef SAVE_RCSID

static char rcsid =

"@(#) $Id$";

#endif

#include <stdio.h>

#include <time.h>

#include <signal.h>

#include <unistd.h>

#include <string.h>

#include <errno.h>

#include <exec/types.h>

#ifdef __SASC

#include <proto/dos.h>

#include <clib/graphics_protos.h>

#include <pragmas/graphics.h>

#include <clib/exec_protos.h>

#include <pragmas/exec.h>

#else

#include <inline/dos.h>

#include <inline/exec.h>

#include <inline/graphics.h>

#endif

#include "mydebug.h"

extern struct DosLibrary *DOSBase;

extern struct ExecBase *SysBase;

static struct GfxBase *GfxBase;

#include "SDL_error.h"

#include "SDL_timer.h"

#include "SDL_timer_c.h"

#if defined(DISABLE_THREADS) || defined(FORK_HACK)

#define USE_ITIMER

#endif

/* The first ticks value of the application */

#ifndef __PPC__

static clock_t start;

void SDL_StartTicks(void)

{

/* Set first ticks value */

start=clock();

}

Uint32 SDL_GetTicks (void)

{

clock_t ticks;

ticks=clock()-start;

#ifdef __SASC

// CLOCKS_PER_SEC == 1000 !

return(ticks);

#else

// CLOCKS_PER_SEC != 1000 !

return ticks*(1000/CLOCKS_PER_SEC);

#endif

}

void SDL_Delay (Uint32 ms)

{

// Do a busy wait if time is less than 50ms

if(ms<50)

{

clock_t to_wait=clock();

#ifndef __SASC

ms*=(CLOCKS_PER_SEC/1000);

#endif

to_wait+=ms;

while(clock()<to_wait);

}

else

{

Delay(ms/20);

}

}

#else

ULONG MY_CLOCKS_PER_SEC;

void PPC_TimerInit(void);

APTR MyTimer;

ULONG start[2];

void SDL_StartTicks(void)

{

/* Set first ticks value */

if(!MyTimer)

PPC_TimerInit();

PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,start);

start[1]>>=10;

start[1]|=((result[0]&0x3ff)<<22);

start[0]>>=10;

}

Uint32 SDL_GetTicks (void)

{

ULONG result[2];

PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,result);

// PPCAsr64p(result,10);

// Non va, la emulo:

result[1]>>=10;

result[1]|=((result[0]&0x3ff)<<22);

// Non mi interessa piu' result[0]

return result[1]*1000/MY_CLOCKS_PER_SEC;

}

void SDL_Delay (Uint32 ms)

{

// Do a busy wait if time is less than 50ms

if(ms<50)

{

ULONG to_wait[2],actual[2];

PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,result);

actual[1]=0;

to_wait[1]+=ms*1000/MY_CLOCKS_PER_SEC;

while(actual[1]<to_wait[1])

{

PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,actual);

}

}

else

{

Delay(ms/50);

}

}

void PPC_TimerInit(void)

{

struct TagItem tags[]=

{

PPCTIMERTAG_CPU,TRUE,

TAG_DONE,0

};

if(MyTimer=PPCCreateTimerObject(tags))

{

ULONG result[2];

PPCGetTimerObject(MyTimer,PPCTIMERTAG_TICKSPERSEC,result);

D(bug("Timer inizializzato, TPS: %lu - %lu\n",result[0],result[1]));

// PPCAsr64p(result,10);

result[1]>>=10;

result[1]|=((result[0]&0x3ff)<<22);

result[0]>>=10;

D(bug("Shiftato TPS: %lu - %lu\n",result[0],result[1]));

MY_CLOCKS_PER_SEC=result[1];

PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,result);

D(bug("Current ticks: %lu - %lu\n",result[0],result[1]));

result[1]>>=10;

result[1]|=((result[0]&0x3ff)<<22);

result[0]>>=10;

// PPCAsr64p(result,10);

D(bug("Shiftato: %lu - %lu\n",result[0],result[1]));

}

else

{

D(bug("Errore nell'inizializzazione del timer!\n"));

}

}

#endif

#include "SDL_thread.h"

/* Data to handle a single periodic alarm */

static int timer_alive = 0;

static SDL_Thread *timer_thread = NULL;

static int RunTimer(void *unused)

{

D(bug("SYSTimer: Entering RunTimer loop..."));

if(GfxBase==NULL)

GfxBase=(struct GfxBase *)OpenLibrary("graphics.library",37);

while ( timer_alive ) {

if ( SDL_timer_running ) {

SDL_ThreadedTimerCheck();

}

if(GfxBase)

WaitTOF(); // Check the timer every fifth of seconds. Was SDL_Delay(1)->BusyWait!

else

Delay(1);

}

D(bug("SYSTimer: EXITING RunTimer loop..."));

return(0);

}

/* This is only called if the event thread is not running */

int SDL_SYS_TimerInit(void)

{

D(bug("Creo il thread per il timer (NOITMER)...\n"));

timer_alive = 1;

timer_thread = SDL_CreateThread(RunTimer, NULL);

if ( timer_thread == NULL )

{

D(bug("Creazione del thread fallita...\n"));

return(-1);

}

return(SDL_SetTimerThreaded(1));

}

void SDL_SYS_TimerQuit(void)

{

timer_alive = 0;

if ( timer_thread ) {

SDL_WaitThread(timer_thread, NULL);

timer_thread = NULL;

}

}

int SDL_SYS_StartTimer(void)

{

SDL_SetError("Internal logic error: AmigaOS uses threaded timer");

return(-1);

}

void SDL_SYS_StopTimer(void)

{

return;

}