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/*-----------------------------------------------------------------------------
ST-Sound ( YM files player library )
Copyright (C) 1995-1999 Arnaud Carre ( http://leonard.oxg.free.fr )
Extended YM-2149 Emulator, with ATARI music demos effects.
(SID-Like, Digidrum, Sync Buzzer, Sinus SID and Pattern SID)
-----------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------
This file is part of ST-Sound
ST-Sound 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.
ST-Sound 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 ST-Sound; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-----------------------------------------------------------------------------*/
#ifndef __YM2149EX__
#define __YM2149EX__
#define AMSTRAD_CLOCK 1000000L
#define ATARI_CLOCK 2000000L
#define SPECTRUM_CLOCK 1773400L
#define MFP_CLOCK 2457600L
#define NOISESIZE 16384
#define MAX_NBSAMPLE 1024
#define DRUM_PREC 15
#define PI 3.1415926
#define SIDSINPOWER 0.7
enum
{
VOICE_A=0,
VOICE_B=1,
VOICE_C=2,
};
struct YmSpecialEffect
{
ymbool bDrum;
ymu32 drumSize;
ymu8 * drumData;
ymu32 drumPos;
ymu32 drumStep;
ymbool bSid;
ymu32 sidPos;
ymu32 sidStep;
ymint sidVol;
};
static const ymint DC_ADJUST_BUFFERLEN = 512;
class CDcAdjuster
{
public:
CDcAdjuster();
void AddSample(ymint sample);
ymint GetDcLevel(void) { return m_sum / DC_ADJUST_BUFFERLEN; }
void Reset(void);
private:
ymint m_buffer[DC_ADJUST_BUFFERLEN];
ymint m_pos;
ymint m_sum;
};
class CYm2149Ex
{
public:
CYm2149Ex(ymu32 masterClock=ATARI_CLOCK,ymint prediv=1,ymu32 playRate=44100);
~CYm2149Ex();
void reset(void);
void update(signed short *pSampleBuffer,ymint nbSample);
void setClock(ymu32 _clock);
void writeRegister(ymint reg,ymint value);
ymint readRegister(ymint reg);
void drumStart(ymint voice,ymu8 *drumBuffer,ymu32 drumSize,ymint drumFreq);
void drumStop(ymint voice);
void sidStart(ymint voice,ymint freq,ymint vol);
void sidSinStart(ymint voice,ymint timerFreq,ymint sinPattern);
void sidStop(ymint voice);
void syncBuzzerStart(ymint freq,ymint envShape);
void syncBuzzerStop(void);
private:
CDcAdjuster m_dcAdjust;
ymu32 frameCycle;
ymu32 cyclePerSample;
inline ymsample nextSample(void);
ymu32 toneStepCompute(ymint rHigh,ymint rLow);
ymu32 noiseStepCompute(ymint rNoise);
ymu32 envStepCompute(ymint rHigh,ymint rLow);
void updateEnvGen(ymint nbSample);
void updateNoiseGen(ymint nbSample);
void updateToneGen(ymint voice,ymint nbSample);
ymu32 rndCompute(void);
void sidVolumeCompute(ymint voice,ymint *pVol);
ymint replayFrequency;
ymu32 internalClock;
ymint registers[14];
ymu32 cycleSample;
ymu32 stepA,stepB,stepC;
ymu32 posA,posB,posC;
ymint volA,volB,volC,volE;
ymu32 mixerTA,mixerTB,mixerTC;
ymu32 mixerNA,mixerNB,mixerNC;
ymint *pVolA,*pVolB,*pVolC;
ymu32 noiseStep;
ymu32 noisePos;
ymu32 rndRack;
ymu32 currentNoise;
ymu32 bWrite13;
ymu32 envStep;
ymu32 envPos;
ymint envPhase;
ymint envShape;
ymu8 envData[16][2][16*2];
ymint globalVolume;
struct YmSpecialEffect specialEffect[3];
ymbool bSyncBuzzer;
ymu32 syncBuzzerStep;
ymu32 syncBuzzerPhase;
ymint syncBuzzerShape;
};
#endif
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