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audio/softsynth/opl/mame.h
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199
audio/softsynth/opl/mame.h
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/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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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 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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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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*/
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#ifndef AUDIO_SOFTSYNTH_OPL_MAME_H
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#define AUDIO_SOFTSYNTH_OPL_MAME_H
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#include "common/scummsys.h"
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#include "common/random.h"
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#include "audio/fmopl.h"
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namespace OPL {
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namespace MAME {
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enum {
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FMOPL_ENV_BITS_HQ = 16,
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FMOPL_ENV_BITS_MQ = 8,
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FMOPL_ENV_BITS_LQ = 8,
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FMOPL_EG_ENT_HQ = 4096,
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FMOPL_EG_ENT_MQ = 1024,
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FMOPL_EG_ENT_LQ = 128
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};
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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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#define OPL_TYPE_WAVESEL 0x01 /* waveform select */
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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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int TL; /* total level :TL << 8 */
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int TLL; /* adjusted now TL */
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uint8 KSR; /* key scale rate :(shift down bit) */
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int *AR; /* attack rate :&AR_TABLE[AR<<2] */
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int *DR; /* decay rate :&DR_TABLE[DR<<2] */
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int SL; /* sustain level :SL_TABLE[SL] */
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int *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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uint mul; /* multiple :ML_TABLE[ML] */
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uint Cnt; /* frequency count */
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uint 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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int evc; /* envelope counter */
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int eve; /* envelope counter end point */
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int evs; /* envelope counter step */
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int evsa; /* envelope step for AR :AR[ksr] */
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int evsd; /* envelope step for DR :DR[ksr] */
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int 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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int **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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int *connect1; /* slot1 output pointer */
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int *connect2; /* slot2 output pointer */
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int op1_out[2]; /* slot1 output for selfeedback */
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/* phase generator state */
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uint block_fnum; /* block+fnum */
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uint8 kcode; /* key code : KeyScaleCode */
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uint fc; /* Freq. Increment base */
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uint 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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typedef struct fm_opl_f {
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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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uint 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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/* Rhythm sention */
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uint8 rhythm; /* Rhythm mode , key flag */
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/* time tables */
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int AR_TABLE[76]; /* atttack rate tables */
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int DR_TABLE[76]; /* decay rate tables */
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uint FN_TABLE[1024];/* fnumber -> increment counter */
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/* LFO */
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int *ams_table;
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int *vib_table;
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int amsCnt;
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int amsIncr;
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int vibCnt;
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int 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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Common::RandomSource *rnd;
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} FM_OPL;
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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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void OPLBuildTables(int ENV_BITS_PARAM, int EG_ENT_PARAM);
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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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void YM3812UpdateOne(FM_OPL *OPL, int16 *buffer, int length);
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// Factory method
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FM_OPL *makeAdLibOPL(int rate);
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// OPL API implementation
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class OPL : public ::OPL::OPL, public Audio::EmulatedChip {
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private:
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FM_OPL *_opl;
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public:
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OPL() : _opl(0) {}
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~OPL();
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bool init();
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void reset();
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void write(int a, int v);
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void writeReg(int r, int v);
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bool isStereo() const { return false; }
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protected:
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void generateSamples(int16 *buffer, int length);
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};
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} // End of namespace MAME
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} // End of namespace OPL
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#endif
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