kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
92 wiersze
4.4 KiB
C
92 wiersze
4.4 KiB
C
/** EMULib Emulation Library *********************************/
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/** **/
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/** AY8910.h **/
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/** **/
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/** This file contains emulation for the AY8910 sound chip **/
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/** produced by General Instruments, Yamaha, etc. See **/
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/** AY8910.c for the actual code. **/
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/** **/
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/** Copyright (C) Marat Fayzullin 1996-2003 **/
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/** You are not allowed to distribute this software **/
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/** commercially. Please, notify me, if you make any **/
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/** changes to this file. **/
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/*************************************************************/
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#ifndef AY8910_H
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#define AY8910_H
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#define AY8910_BASE 111861 /* Base frequency for AY8910 */
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#define AY8910_CHANNELS 6 /* 3 melodic + 3 noise chanls */
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#define AY8910_ASYNC 0 /* Asynchronous emulation */
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#define AY8910_SYNC 1 /* Synchronous emulation */
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#define AY8910_FLUSH 2 /* Flush buffers only */
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#define AY8910_DRUMS 0x80 /* Hit drums for noise chnls */
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#ifndef BYTE_TYPE_DEFINED
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#define BYTE_TYPE_DEFINED
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typedef unsigned char byte;
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#endif
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/** AY8910 ***************************************************/
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/** This data structure stores AY8910 state. **/
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/*************************************************************/
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typedef struct
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{
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byte R[16]; /* PSG registers contents */
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int Freq[AY8910_CHANNELS]; /* Frequencies (0 for off) */
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int Volume[AY8910_CHANNELS]; /* Volumes (0..255) */
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int First; /* First used Sound() channel */
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byte Changed; /* Bitmap of changed channels */
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byte Sync; /* AY8910_SYNC/AY8910_ASYNC */
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byte Latch; /* Latch for the register num */
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int EPeriod; /* Envelope step in msecs */
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int ECount; /* Envelope step counter */
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byte Phase[3]; /* Envelope phase (0 for off) */
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} AY8910;
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/** Reset8910() **********************************************/
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/** Reset the sound chip and use sound channels from the **/
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/** one given in First. **/
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/*************************************************************/
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void Reset8910(register AY8910 *D,int First);
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/** Write8910() **********************************************/
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/** Call this function to output a value V into the sound **/
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/** chip. **/
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/*************************************************************/
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void Write8910(register AY8910 *D,register byte R,register byte V);
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/** WrCtrl8910() *********************************************/
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/** Write a value V to the PSG Control Port. **/
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/*************************************************************/
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void WrCtrl8910(AY8910 *D,byte V);
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/** WrData8910() *********************************************/
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/** Write a value V to the PSG Data Port. **/
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/*************************************************************/
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void WrData8910(AY8910 *D,byte V);
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/** RdData8910() *********************************************/
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/** Read a value from the PSG Data Port. **/
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/*************************************************************/
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byte RdData8910(AY8910 *D);
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/** Sync8910() ***********************************************/
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/** Flush all accumulated changes by issuing Sound() calls **/
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/** and set the synchronization on/off. The second argument **/
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/** should be AY8910_SYNC/AY8910_ASYNC to set/reset sync, **/
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/** or AY8910_FLUSH to leave sync mode as it is. To emulate **/
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/** noise channels with MIDI drums, OR second argument with **/
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/** AY8910_DRUMS. **/
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/*************************************************************/
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void Sync8910(register AY8910 *D,register byte Sync);
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/** Loop8910() ***********************************************/
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/** Call this function periodically to update volume **/
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/** envelopes. Use mS to pass the time since the last call **/
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/** of Loop8910() in milliseconds. **/
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/*************************************************************/
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void Loop8910(register AY8910 *D,int mS);
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#endif /* AY8910_H */
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