/*
THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
*/

#ifndef _TIMER_H
#define _TIMER_H

#include "pstypes.h"
#include "fix.h"

//==========================================================================
// This installs the timer services and interrupts at the rate specified by
// count_val.  If 'function' isn't 0, the function pointed to by function will
// be called 'freq' times per second.  Should be > 19 and anything around
// 2-3000 is gonna start slowing down the system.  Count_val should be
// 1,193,180 divided by your target frequency. Use 0 for the normal 18.2 Hz
// interrupt rate.

#define TIMER_FREQUENCY 1193180
#define _far
#define __far
#define __interrupt

extern void timer_init();
extern void timer_close();
extern void timer_set_rate(int count_val);
extern void timer_set_function( void _far * function );

//==========================================================================
// These functions return the time since the timer was initialized in
// some various units. The total length of reading time varies for each
// one.  They will roll around after they read 2^32.
// There are milliseconds, milliseconds times 10, milliseconds times 100,
// and microseconds.  They time out after 1000 hrs, 100 hrs, 10 hrs, and
// 1 hr, respectively.

#define timer_get_fixedSecondsX TimerGetFixedSeconds
//#define TimerGetApproxSeconds TimerGetFixedSeconds

//==========================================================================
// Use to access the BIOS ticker... ie...   i = TICKER

#define TICKER (TimerGetFixedSeconds())

#define approx_usec_to_fsec(usec) ((usec) >> 4)
#define approx_fsec_to_usec(fsec) ((fsec) << 4)
#define ApproxMSecToFSec(msec) ((msec) << 6)
#define approx_fsec_to_msec(fsec) ((fsec) >> 6)

#define MSEC2X(_s)	fix (float (_s) * (float (I2X (1)) / 1000.0f))

static inline fix TimerGetApproxSeconds (void)
{
return ApproxMSecToFSec (SDL_GetTicks ());
}

static inline fix TimerGetFixedSeconds (void)
{
return MSEC2X (SDL_GetTicks ());
}

static inline void TimerDelay (fix seconds)
{
G3_SLEEP (X2I (FixMul (seconds, I2X (1000))));
}

#endif
