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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* LGPL licensed version of MAMEs fmopl (V0.37a modified) by
* Tatsuyuki Satoh. Included from LGPL'ed AdPlug.
*
*/
#ifndef AUDIO_SOFTSYNTH_OPL_MAME_H
#define AUDIO_SOFTSYNTH_OPL_MAME_H
#include "common/scummsys.h"
#include "common/random.h"
#include "audio/fmopl.h"
namespace OPL {
namespace MAME {
enum {
FMOPL_ENV_BITS_HQ = 16,
FMOPL_ENV_BITS_MQ = 8,
FMOPL_ENV_BITS_LQ = 8,
FMOPL_EG_ENT_HQ = 4096,
FMOPL_EG_ENT_MQ = 1024,
FMOPL_EG_ENT_LQ = 128
};
typedef void (*OPL_TIMERHANDLER)(int channel,double interval_Sec);
typedef void (*OPL_IRQHANDLER)(int param,int irq);
typedef void (*OPL_UPDATEHANDLER)(int param,int min_interval_us);
#define OPL_TYPE_WAVESEL 0x01 /* waveform select */
/* Saving is necessary for member of the 'R' mark for suspend/resume */
/* ---------- OPL one of slot ---------- */
typedef struct fm_opl_slot {
int TL; /* total level :TL << 8 */
int TLL; /* adjusted now TL */
uint8 KSR; /* key scale rate :(shift down bit) */
int *AR; /* attack rate :&AR_TABLE[AR<<2] */
int *DR; /* decay rate :&DR_TABLE[DR<<2] */
int SL; /* sustain level :SL_TABLE[SL] */
int *RR; /* release rate :&DR_TABLE[RR<<2] */
uint8 ksl; /* keyscale level :(shift down bits) */
uint8 ksr; /* key scale rate :kcode>>KSR */
uint mul; /* multiple :ML_TABLE[ML] */
uint Cnt; /* frequency count */
uint Incr; /* frequency step */
/* envelope generator state */
uint8 eg_typ;/* envelope type flag */
uint8 evm; /* envelope phase */
int evc; /* envelope counter */
int eve; /* envelope counter end point */
int evs; /* envelope counter step */
int evsa; /* envelope step for AR :AR[ksr] */
int evsd; /* envelope step for DR :DR[ksr] */
int evsr; /* envelope step for RR :RR[ksr] */
/* LFO */
uint8 ams; /* ams flag */
uint8 vib; /* vibrate flag */
/* wave selector */
int **wavetable;
} OPL_SLOT;
/* ---------- OPL one of channel ---------- */
typedef struct fm_opl_channel {
OPL_SLOT SLOT[2];
uint8 CON; /* connection type */
uint8 FB; /* feed back :(shift down bit)*/
int *connect1; /* slot1 output pointer */
int *connect2; /* slot2 output pointer */
int op1_out[2]; /* slot1 output for selfeedback */
/* phase generator state */
uint block_fnum; /* block+fnum */
uint8 kcode; /* key code : KeyScaleCode */
uint fc; /* Freq. Increment base */
uint ksl_base; /* KeyScaleLevel Base step */
uint8 keyon; /* key on/off flag */
} OPL_CH;
/* OPL state */
typedef struct fm_opl_f {
uint8 type; /* chip type */
int clock; /* master clock (Hz) */
int rate; /* sampling rate (Hz) */
double freqbase; /* frequency base */
double TimerBase; /* Timer base time (==sampling time) */
uint8 address; /* address register */
uint8 status; /* status flag */
uint8 statusmask; /* status mask */
uint mode; /* Reg.08 : CSM , notesel,etc. */
/* Timer */
int T[2]; /* timer counter */
uint8 st[2]; /* timer enable */
/* FM channel slots */
OPL_CH *P_CH; /* pointer of CH */
int max_ch; /* maximum channel */
/* Rythm sention */
uint8 rythm; /* Rythm mode , key flag */
/* time tables */
int AR_TABLE[76]; /* atttack rate tables */
int DR_TABLE[76]; /* decay rate tables */
uint FN_TABLE[1024];/* fnumber -> increment counter */
/* LFO */
int *ams_table;
int *vib_table;
int amsCnt;
int amsIncr;
int vibCnt;
int vibIncr;
/* wave selector enable flag */
uint8 wavesel;
/* external event callback handler */
OPL_TIMERHANDLER TimerHandler; /* TIMER handler */
int TimerParam; /* TIMER parameter */
OPL_IRQHANDLER IRQHandler; /* IRQ handler */
int IRQParam; /* IRQ parameter */
OPL_UPDATEHANDLER UpdateHandler; /* stream update handler */
int UpdateParam; /* stream update parameter */
Common::RandomSource *rnd;
} FM_OPL;
/* ---------- Generic interface section ---------- */
#define OPL_TYPE_YM3526 (0)
#define OPL_TYPE_YM3812 (OPL_TYPE_WAVESEL)
void OPLBuildTables(int ENV_BITS_PARAM, int EG_ENT_PARAM);
FM_OPL *OPLCreate(int type, int clock, int rate);
void OPLDestroy(FM_OPL *OPL);
void OPLSetTimerHandler(FM_OPL *OPL, OPL_TIMERHANDLER TimerHandler, int channelOffset);
void OPLSetIRQHandler(FM_OPL *OPL, OPL_IRQHANDLER IRQHandler, int param);
void OPLSetUpdateHandler(FM_OPL *OPL, OPL_UPDATEHANDLER UpdateHandler, int param);
void OPLResetChip(FM_OPL *OPL);
int OPLWrite(FM_OPL *OPL, int a, int v);
unsigned char OPLRead(FM_OPL *OPL, int a);
int OPLTimerOver(FM_OPL *OPL, int c);
void OPLWriteReg(FM_OPL *OPL, int r, int v);
void YM3812UpdateOne(FM_OPL *OPL, int16 *buffer, int length);
// Factory method
FM_OPL *makeAdLibOPL(int rate);
// OPL API implementation
class OPL : public ::OPL::EmulatedOPL {
private:
FM_OPL *_opl;
public:
OPL() : _opl(0) {}
~OPL();
bool init();
void reset();
void write(int a, int v);
byte read(int a);
void writeReg(int r, int v);
bool isStereo() const { return false; }
protected:
void generateSamples(int16 *buffer, int length);
};
} // End of namespace MAME
} // End of namespace OPL
#endif
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