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79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/* Flavor modified sound.c and sound.h from NEOPOP
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* which was originally based on sn76496.c from MAME
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* some ideas also taken from NeoPop-SDL code
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*/
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/*---------------------------------------------------------------------------
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* Originally from
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* NEOPOP : Emulator as in Dreamland
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*
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* Copyright (c) 2001-2002 by neopop_uk
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*---------------------------------------------------------------------------
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*/
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/*---------------------------------------------------------------------------
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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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#ifndef __NEOPOPSOUND__
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#define __NEOPOPSOUND__
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#include "types.h"
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typedef struct
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{
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int LastRegister; /* last register written */
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int Register[8]; /* registers */
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int Volume[4];
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int Period[4];
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int Count[4];
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int Output[4];
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unsigned int RNG; /* noise generator */
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int NoiseFB; /* noise feedback mask */
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} SoundChip;
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extern SoundChip toneChip;
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extern SoundChip noiseChip;
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#ifdef __cplusplus
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extern "C" {
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#endif
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void WriteSoundChip(SoundChip* chip, _u8 data);
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int sound_system_init(void);
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BOOL system_sound_init(void);
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void system_sound_chipreset(void);
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void system_sound_update(int nframes);
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void system_VBL(void);
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#define Write_SoundChipTone(VALUE) (WriteSoundChip(&toneChip, VALUE))
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#define Write_SoundChipNoise(VALUE) (WriteSoundChip(&noiseChip, VALUE))
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void sound_init(int SampleRate);
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extern BOOL mute;
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void dac_update(_u16* dac_buffer, int length_bytes);
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void sound_update(_u16* chip_buffer, int length_bytes);
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void increaseVolume(void);
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void decreaseVolume(void);
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void dac_writeL(unsigned char a);
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void dac_write(unsigned char a);
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#ifdef __cplusplus
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}
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#endif
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#endif
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