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154 lines
6.1 KiB
C
154 lines
6.1 KiB
C
/* ScummVM - Scumm Interpreter
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* Copyright (C) 1999/2000 Tatsuyuki Satoh
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* Copyright (C) 2001/2002 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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* LGPL licensed version of MAMEs fmopl (V0.37a modified) by
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* Tatsuyuki Satoh. Included from LGPL'ed AdPlug.
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*/
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#ifndef __FMOPL_H_
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#define __FMOPL_H_
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#include "scummsys.h"
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typedef int16 OPLSAMPLE;
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typedef void (*OPL_TIMERHANDLER)(int channel,double interval_Sec);
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typedef void (*OPL_IRQHANDLER)(int param,int irq);
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typedef void (*OPL_UPDATEHANDLER)(int param,int min_interval_us);
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typedef void (*OPL_PORTHANDLER_W)(int param,unsigned char data);
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typedef unsigned char (*OPL_PORTHANDLER_R)(int param);
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/* !!!!! here is private section , do not access there member direct !!!!! */
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#define OPL_TYPE_WAVESEL 0x01 /* waveform select */
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#define OPL_TYPE_ADPCM 0x02 /* DELTA-T ADPCM unit */
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#define OPL_TYPE_KEYBOARD 0x04 /* keyboard interface */
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#define OPL_TYPE_IO 0x08 /* I/O port */
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/* Saving is necessary for member of the 'R' mark for suspend/resume */
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/* ---------- OPL one of slot ---------- */
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typedef struct fm_opl_slot {
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int32 TL; /* total level :TL << 8 */
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int32 TLL; /* adjusted now TL */
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uint8 KSR; /* key scale rate :(shift down bit) */
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int32 *AR; /* attack rate :&AR_TABLE[AR<<2] */
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int32 *DR; /* decay rate :&DR_TALBE[DR<<2] */
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int32 SL; /* sustin level :SL_TALBE[SL] */
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int32 *RR; /* release rate :&DR_TABLE[RR<<2] */
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uint8 ksl; /* keyscale level :(shift down bits) */
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uint8 ksr; /* key scale rate :kcode>>KSR */
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uint32 mul; /* multiple :ML_TABLE[ML] */
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uint32 Cnt; /* frequency count : */
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uint32 Incr; /* frequency step : */
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/* envelope generator state */
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uint8 eg_typ; /* envelope type flag */
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uint8 evm; /* envelope phase */
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int32 evc; /* envelope counter */
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int32 eve; /* envelope counter end point */
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int32 evs; /* envelope counter step */
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int32 evsa; /* envelope step for AR :AR[ksr] */
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int32 evsd; /* envelope step for DR :DR[ksr] */
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int32 evsr; /* envelope step for RR :RR[ksr] */
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/* LFO */
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uint8 ams; /* ams flag */
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uint8 vib; /* vibrate flag */
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/* wave selector */
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int32 **wavetable;
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}OPL_SLOT;
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/* ---------- OPL one of channel ---------- */
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typedef struct fm_opl_channel {
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OPL_SLOT SLOT[2];
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uint8 CON; /* connection type */
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uint8 FB; /* feed back :(shift down bit) */
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int32 *connect1; /* slot1 output pointer */
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int32 *connect2; /* slot2 output pointer */
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int32 op1_out[2]; /* slot1 output for selfeedback */
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/* phase generator state */
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uint32 block_fnum; /* block+fnum : */
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uint8 kcode; /* key code : KeyScaleCode */
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uint32 fc; /* Freq. Increment base */
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uint32 ksl_base; /* KeyScaleLevel Base step */
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uint8 keyon; /* key on/off flag */
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} OPL_CH;
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/* OPL state */
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struct FM_OPL {
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uint8 type; /* chip type */
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int clock; /* master clock (Hz) */
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int rate; /* sampling rate (Hz) */
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double freqbase; /* frequency base */
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double TimerBase; /* Timer base time (==sampling time) */
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uint8 address; /* address register */
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uint8 status; /* status flag */
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uint8 statusmask; /* status mask */
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uint32 mode; /* Reg.08 : CSM , notesel,etc. */
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/* Timer */
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int T[2]; /* timer counter */
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uint8 st[2]; /* timer enable */
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/* FM channel slots */
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OPL_CH *P_CH; /* pointer of CH */
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int max_ch; /* maximum channel */
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/* Rythm sention */
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uint8 rythm; /* Rythm mode , key flag */
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/* time tables */
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/* LFO */
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int32 *ams_table;
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int32 *vib_table;
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int32 amsCnt;
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int32 amsIncr;
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int32 vibCnt;
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int32 vibIncr;
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/* wave selector enable flag */
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uint8 wavesel;
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/* external event callback handler */
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OPL_TIMERHANDLER TimerHandler; /* TIMER handler */
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int TimerParam; /* TIMER parameter */
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OPL_IRQHANDLER IRQHandler; /* IRQ handler */
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int IRQParam; /* IRQ parameter */
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OPL_UPDATEHANDLER UpdateHandler; /* stream update handler */
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int UpdateParam; /* stream update parameter */
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int32 AR_TABLE[75]; /* atttack rate tables */
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int32 DR_TABLE[75]; /* decay rate tables */
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uint32 FN_TABLE[1024]; /* fnumber -> increment counter */
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};
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/* ---------- Generic interface section ---------- */
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#define OPL_TYPE_YM3526 (0)
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#define OPL_TYPE_YM3812 (OPL_TYPE_WAVESEL)
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#define OPL_TYPE_Y8950 (OPL_TYPE_ADPCM|OPL_TYPE_KEYBOARD|OPL_TYPE_IO)
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FM_OPL *OPLCreate(int type, int clock, int rate);
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void OPLDestroy(FM_OPL *OPL);
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void OPLSetTimerHandler(FM_OPL *OPL,OPL_TIMERHANDLER TimerHandler,int channelOffset);
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void OPLSetIRQHandler(FM_OPL *OPL,OPL_IRQHANDLER IRQHandler,int param);
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void OPLSetUpdateHandler(FM_OPL *OPL,OPL_UPDATEHANDLER UpdateHandler,int param);
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void OPLResetChip(FM_OPL *OPL);
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int OPLWrite(FM_OPL *OPL,int a,int v);
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unsigned char OPLRead(FM_OPL *OPL,int a);
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int OPLTimerOver(FM_OPL *OPL,int c);
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void OPLWriteReg(FM_OPL *OPL, int r, int v);
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/* YM3626/YM3812 local section */
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void YM3812UpdateOne(FM_OPL *OPL, int16 *buffer, int length);
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#endif
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