RACE/sound.c

/*---------------------------------------------------------------------------
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version. See also the license.txt file for
 *	additional informations.
 *---------------------------------------------------------------------------
 */

/* sound.cpp: implementation of the sound class. */

#include "types.h"

#ifdef DRZ80
#include "DrZ80_support.h"
#else
#if defined(CZ80)
#include "cz80_support.h"
#else
#include "z80.h"
#endif
#endif

#include <math.h>

#define Machine (&m_emuInfo)

int sndCycles = 0;

void soundStep(int cycles)
{
   sndCycles+= cycles;
}

/*
 *
 * Neogeo Pocket Sound system
 *
 */

unsigned int	ngpRunning;

void ngpSoundStart(void)
{
   ngpRunning = 1;	/* ? */
#if defined(DRZ80) || defined(CZ80)
   Z80_Reset();
#else
   z80Init();
   z80SetRunning(1);
#endif
}

/* Execute all gained cycles (divided by 2) */
void ngpSoundExecute(void)
{
#if defined(DRZ80) || defined(CZ80)
   int toRun = sndCycles/2;
   if(ngpRunning)
   {
      Z80_Execute(toRun);
   }
#if 0
   timer_add_cycles(toRun);
#endif
   sndCycles -= toRun;
#else
   int		elapsed;
   while(sndCycles > 0)
   {
      elapsed = z80Step();
      sndCycles-= (2*elapsed);
#if 0
      timer_add_cycles(elapsed);
#endif
   }
#endif
}

/* Switch sound system off */
void ngpSoundOff(void)
{
   ngpRunning = 0;
#if defined(DRZ80) || defined(CZ80)

#else
   z80SetRunning(0);
#endif
}

/* Generate interrupt to ngp sound system */
void ngpSoundInterrupt(void)
{
   if (ngpRunning)
   {
#if defined(DRZ80) || defined(CZ80)
      Z80_Cause_Interrupt(0x100); /* Z80_IRQ_INT??? */
#else
      z80Interrupt(0);
#endif
   }
}