/* 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