mirror of
https://github.com/libretro/RACE.git
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106 lines
1.9 KiB
C++
106 lines
1.9 KiB
C++
/*---------------------------------------------------------------------------
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version. See also the license.txt file for
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* additional informations.
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*---------------------------------------------------------------------------
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*/
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/* sound.cpp: implementation of the sound class. */
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#include "StdAfx.h"
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#include "main.h"
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#include "sound.h"
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#include "memory.h"
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#ifdef DRZ80
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#include "DrZ80_support.h"
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#else
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#if defined(CZ80)
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#include "cz80_support.h"
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#else
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#include "z80.h"
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#endif
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#endif
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#include <math.h>
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#define Machine (&m_emuInfo)
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int sndCycles = 0;
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void soundStep(int cycles)
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{
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sndCycles+= cycles;
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}
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/*
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*
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* Neogeo Pocket Sound system
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*
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*/
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unsigned int ngpRunning;
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void ngpSoundStart(void)
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{
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ngpRunning = 1; /* ? */
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#if defined(DRZ80) || defined(CZ80)
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Z80_Reset();
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#else
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z80Init();
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z80SetRunning(1);
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#endif
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}
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/* Execute all gained cycles (divided by 2) */
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void ngpSoundExecute(void)
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{
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#if defined(DRZ80) || defined(CZ80)
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int toRun = sndCycles/2;
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if(ngpRunning)
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{
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Z80_Execute(toRun);
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}
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#if 0
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timer_add_cycles(toRun);
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#endif
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sndCycles -= toRun;
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#else
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int elapsed;
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while(sndCycles > 0)
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{
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elapsed = z80Step();
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sndCycles-= (2*elapsed);
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#if 0
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timer_add_cycles(elapsed);
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#endif
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}
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#endif
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}
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/* Switch sound system off */
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void ngpSoundOff(void)
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{
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ngpRunning = 0;
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#if defined(DRZ80) || defined(CZ80)
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#else
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z80SetRunning(0);
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#endif
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}
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/* Generate interrupt to ngp sound system */
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void ngpSoundInterrupt(void)
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{
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if (ngpRunning)
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{
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#if defined(DRZ80) || defined(CZ80)
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Z80_Cause_Interrupt(0x100); /* Z80_IRQ_INT??? */
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#else
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z80Interrupt(0);
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#endif
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}
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}
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