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/*
**
** File: ym2413.c - software implementation of YM2413
** FM sound generator type OPLL
**
** Copyright Jarek Burczynski
**
** Version 1.0
**
Features as listed in LSI-212413A2 data sheet:
1. FM Sound Generator for real sound creation.
2. Two Selectable modes: 9 simultaneous sounds or 6 melody sounds plus 5 rhythm sounds
(different tones can be used together in either case).
3. Built-in Instruments data (15 melody tones, 5 rhythm tones, "CAPTAIN and TELETEXT applicalbe tones).
4. Built-in DA Converter.
5. Built-in Quartz Oscillator.
6. Built-in Vibrato Oscillator/AM Oscillator
7. TTL Compatible Input.
8. Si-Gate NMOS LSI
9. A single 5V power source.
to do:
- make sure of the sinus amplitude bits
- make sure of the EG resolution bits (looks like the biggest
modulation index generated by the modulator is 123, 124 = no modulation)
- find proper algorithm for attack phase of EG
- tune up instruments ROM
- support sample replay in test mode (it is NOT as simple as setting bit 0
in register 0x0f and using register 0x10 for sample data).
Which games use this feature ?
*/
#define _USE_MATH_DEFINES
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "mamedef.h"
#include "ym2413.h"
#ifndef INLINE
#define INLINE static __inline
#endif
#ifndef logerror
#define logerror (void)
#endif
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
/* output final shift */
#if (SAMPLE_BITS==16)
#define FINAL_SH (0)
#define MAXOUT (+32767)
#define MINOUT (-32768)
#else
#define FINAL_SH (8)
#define MAXOUT (+127)
#define MINOUT (-128)
#endif
#define FREQ_SH 16 /* 16.16 fixed point (frequency calculations) */
#define EG_SH 16 /* 16.16 fixed point (EG timing) */
#define LFO_SH 24 /* 8.24 fixed point (LFO calculations) */
#define FREQ_MASK ((1<<FREQ_SH)-1)
/* envelope output entries */
#define ENV_BITS 10
#define ENV_LEN (1<<ENV_BITS)
#define ENV_STEP (128.0/ENV_LEN)
#define MAX_ATT_INDEX ((1<<(ENV_BITS-2))-1) /*255*/
#define MIN_ATT_INDEX (0)
/* sinwave entries */
#define SIN_BITS 10
#define SIN_LEN (1<<SIN_BITS)
#define SIN_MASK (SIN_LEN-1)
#define TL_RES_LEN (256) /* 8 bits addressing (real chip) */
/* register number to channel number , slot offset */
#define SLOT1 0
#define SLOT2 1
/* Envelope Generator phases */
#define EG_DMP 5
#define EG_ATT 4
#define EG_DEC 3
#define EG_SUS 2
#define EG_REL 1
#define EG_OFF 0
typedef struct{
UINT32 ar; /* attack rate: AR<<2 */
UINT32 dr; /* decay rate: DR<<2 */
UINT32 rr; /* release rate:RR<<2 */
UINT8 KSR; /* key scale rate */
UINT8 ksl; /* keyscale level */
UINT8 ksr; /* key scale rate: kcode>>KSR */
UINT8 mul; /* multiple: mul_tab[ML] */
/* Phase Generator */
UINT32 phase; /* frequency counter */
UINT32 freq; /* frequency counter step */
UINT8 fb_shift; /* feedback shift value */
INT32 op1_out[2]; /* slot1 output for feedback */
/* Envelope Generator */
UINT8 eg_type; /* percussive/nonpercussive mode*/
UINT8 state; /* phase type */
UINT32 TL; /* total level: TL << 2 */
INT32 TLL; /* adjusted now TL */
INT32 volume; /* envelope counter */
UINT32 sl; /* sustain level: sl_tab[SL] */
UINT8 eg_sh_dp; /* (dump state) */
UINT8 eg_sel_dp; /* (dump state) */
UINT8 eg_sh_ar; /* (attack state) */
UINT8 eg_sel_ar; /* (attack state) */
UINT8 eg_sh_dr; /* (decay state) */
UINT8 eg_sel_dr; /* (decay state) */
UINT8 eg_sh_rr; /* (release state for non-perc.)*/
UINT8 eg_sel_rr; /* (release state for non-perc.)*/
UINT8 eg_sh_rs; /* (release state for perc.mode)*/
UINT8 eg_sel_rs; /* (release state for perc.mode)*/
UINT32 key; /* 0 = KEY OFF, >0 = KEY ON */
/* LFO */
UINT32 AMmask; /* LFO Amplitude Modulation enable mask */
UINT8 vib; /* LFO Phase Modulation enable flag (active high)*/
/* waveform select */
unsigned int wavetable;
} OPLL_SLOT;
#define OPLL_MASK_CH(x) (1<<(x))
#define OPLL_MASK_HH (1<<(9))
#define OPLL_MASK_CYM (1<<(10))
#define OPLL_MASK_TOM (1<<(11))
#define OPLL_MASK_SD (1<<(12))
#define OPLL_MASK_BD (1<<(13))
#define OPLL_MASK_RHYTHM ( OPLL_MASK_HH | OPLL_MASK_CYM | OPLL_MASK_TOM | OPLL_MASK_SD | OPLL_MASK_BD )
typedef struct{
OPLL_SLOT SLOT[2];
/* phase generator state */
UINT32 block_fnum; /* block+fnum */
UINT32 fc; /* Freq. freqement base */
UINT32 ksl_base; /* KeyScaleLevel Base step */
UINT8 kcode; /* key code (for key scaling) */
UINT8 sus; /* sus on/off (release speed in percussive mode)*/
} OPLL_CH;
/* chip state */
typedef struct {
OPLL_CH P_CH[9]; /* OPLL chips have 9 channels*/
UINT8 instvol_r[9]; /* instrument/volume (or volume/volume in percussive mode)*/
UINT32 eg_cnt; /* global envelope generator counter */
UINT32 eg_timer; /* global envelope generator counter works at frequency = chipclock/72 */
UINT32 eg_timer_add; /* step of eg_timer */
UINT32 eg_timer_overflow; /* envelope generator timer overlfows every 1 sample (on real chip) */
UINT8 rhythm; /* Rhythm mode */
/* LFO */
UINT32 lfo_am_cnt;
UINT32 lfo_am_inc;
UINT32 lfo_pm_cnt;
UINT32 lfo_pm_inc;
UINT32 noise_rng; /* 23 bit noise shift register */
UINT32 noise_p; /* current noise 'phase' */
UINT32 noise_f; /* current noise period */
/* instrument settings */
/*
0-user instrument
1-15 - fixed instruments
16 -bass drum settings
17,18 - other percussion instruments
*/
UINT8 inst_tab[19][8];
/* external event callback handlers */
OPLL_UPDATEHANDLER UpdateHandler; /* stream update handler */
void * UpdateParam; /* stream update parameter */
UINT32 fn_tab[1024]; /* fnumber->increment counter */
UINT8 address; /* address register */
UINT8 status; /* status flag */
int clock; /* master clock (Hz) */
int rate; /* sampling rate (Hz) */
double freqbase; /* frequency base */
/* work table */
OPLL_SLOT *SLOT7_1,*SLOT7_2,*SLOT8_1,*SLOT8_2;
signed int output[2];
UINT32 LFO_AM;
INT32 LFO_PM;
int chip_type;
UINT32 mask;
} YM2413;
/* key scale level */
/* table is 3dB/octave, DV converts this into 6dB/octave */
/* 0.1875 is bit 0 weight of the envelope counter (volume) expressed in the 'decibel' scale */
#define DV (0.1875/1.0)
static const UINT32 ksl_tab[8*16]=
{
/* OCT 0 */
0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
/* OCT 1 */
0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
0.000/DV, 0.750/DV, 1.125/DV, 1.500/DV,
1.875/DV, 2.250/DV, 2.625/DV, 3.000/DV,
/* OCT 2 */
0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
0.000/DV, 1.125/DV, 1.875/DV, 2.625/DV,
3.000/DV, 3.750/DV, 4.125/DV, 4.500/DV,
4.875/DV, 5.250/DV, 5.625/DV, 6.000/DV,
/* OCT 3 */
0.000/DV, 0.000/DV, 0.000/DV, 1.875/DV,
3.000/DV, 4.125/DV, 4.875/DV, 5.625/DV,
6.000/DV, 6.750/DV, 7.125/DV, 7.500/DV,
7.875/DV, 8.250/DV, 8.625/DV, 9.000/DV,
/* OCT 4 */
0.000/DV, 0.000/DV, 3.000/DV, 4.875/DV,
6.000/DV, 7.125/DV, 7.875/DV, 8.625/DV,
9.000/DV, 9.750/DV,10.125/DV,10.500/DV,
10.875/DV,11.250/DV,11.625/DV,12.000/DV,
/* OCT 5 */
0.000/DV, 3.000/DV, 6.000/DV, 7.875/DV,
9.000/DV,10.125/DV,10.875/DV,11.625/DV,
12.000/DV,12.750/DV,13.125/DV,13.500/DV,
13.875/DV,14.250/DV,14.625/DV,15.000/DV,
/* OCT 6 */
0.000/DV, 6.000/DV, 9.000/DV,10.875/DV,
12.000/DV,13.125/DV,13.875/DV,14.625/DV,
15.000/DV,15.750/DV,16.125/DV,16.500/DV,
16.875/DV,17.250/DV,17.625/DV,18.000/DV,
/* OCT 7 */
0.000/DV, 9.000/DV,12.000/DV,13.875/DV,
15.000/DV,16.125/DV,16.875/DV,17.625/DV,
18.000/DV,18.750/DV,19.125/DV,19.500/DV,
19.875/DV,20.250/DV,20.625/DV,21.000/DV
};
#undef DV
/* sustain level table (3dB per step) */
/* 0 - 15: 0, 3, 6, 9,12,15,18,21,24,27,30,33,36,39,42,45 (dB)*/
#define SC(db) (UINT32) ( db * (1.0/ENV_STEP) )
static const UINT32 sl_tab[16]={
SC( 0),SC( 1),SC( 2),SC(3 ),SC(4 ),SC(5 ),SC(6 ),SC( 7),
SC( 8),SC( 9),SC(10),SC(11),SC(12),SC(13),SC(14),SC(15)
};
#undef SC
#define RATE_STEPS (8)
static const unsigned char eg_inc[15*RATE_STEPS]={
/*cycle:0 1 2 3 4 5 6 7*/
/* 0 */ 0,1, 0,1, 0,1, 0,1, /* rates 00..12 0 (increment by 0 or 1) */
/* 1 */ 0,1, 0,1, 1,1, 0,1, /* rates 00..12 1 */
/* 2 */ 0,1, 1,1, 0,1, 1,1, /* rates 00..12 2 */
/* 3 */ 0,1, 1,1, 1,1, 1,1, /* rates 00..12 3 */
/* 4 */ 1,1, 1,1, 1,1, 1,1, /* rate 13 0 (increment by 1) */
/* 5 */ 1,1, 1,2, 1,1, 1,2, /* rate 13 1 */
/* 6 */ 1,2, 1,2, 1,2, 1,2, /* rate 13 2 */
/* 7 */ 1,2, 2,2, 1,2, 2,2, /* rate 13 3 */
/* 8 */ 2,2, 2,2, 2,2, 2,2, /* rate 14 0 (increment by 2) */
/* 9 */ 2,2, 2,4, 2,2, 2,4, /* rate 14 1 */
/*10 */ 2,4, 2,4, 2,4, 2,4, /* rate 14 2 */
/*11 */ 2,4, 4,4, 2,4, 4,4, /* rate 14 3 */
/*12 */ 4,4, 4,4, 4,4, 4,4, /* rates 15 0, 15 1, 15 2, 15 3 (increment by 4) */
/*13 */ 8,8, 8,8, 8,8, 8,8, /* rates 15 2, 15 3 for attack */
/*14 */ 0,0, 0,0, 0,0, 0,0, /* infinity rates for attack and decay(s) */
};
#define O(a) (a*RATE_STEPS)
/*note that there is no O(13) in this table - it's directly in the code */
static const unsigned char eg_rate_select[16+64+16]={ /* Envelope Generator rates (16 + 64 rates + 16 RKS) */
/* 16 infinite time rates */
O(14),O(14),O(14),O(14),O(14),O(14),O(14),O(14),
O(14),O(14),O(14),O(14),O(14),O(14),O(14),O(14),
/* rates 00-12 */
O( 0),O( 1),O( 2),O( 3),
O( 0),O( 1),O( 2),O( 3),
O( 0),O( 1),O( 2),O( 3),
O( 0),O( 1),O( 2),O( 3),
O( 0),O( 1),O( 2),O( 3),
O( 0),O( 1),O( 2),O( 3),
O( 0),O( 1),O( 2),O( 3),
O( 0),O( 1),O( 2),O( 3),
O( 0),O( 1),O( 2),O( 3),
O( 0),O( 1),O( 2),O( 3),
O( 0),O( 1),O( 2),O( 3),
O( 0),O( 1),O( 2),O( 3),
O( 0),O( 1),O( 2),O( 3),
/* rate 13 */
O( 4),O( 5),O( 6),O( 7),
/* rate 14 */
O( 8),O( 9),O(10),O(11),
/* rate 15 */
O(12),O(12),O(12),O(12),
/* 16 dummy rates (same as 15 3) */
O(12),O(12),O(12),O(12),O(12),O(12),O(12),O(12),
O(12),O(12),O(12),O(12),O(12),O(12),O(12),O(12),
};
#undef O
/*rate 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 */
/*shift 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, 0 */
/*mask 8191, 4095, 2047, 1023, 511, 255, 127, 63, 31, 15, 7, 3, 1, 0, 0, 0 */
#define O(a) (a*1)
static const unsigned char eg_rate_shift[16+64+16]={ /* Envelope Generator counter shifts (16 + 64 rates + 16 RKS) */
/* 16 infinite time rates */
O(0),O(0),O(0),O(0),O(0),O(0),O(0),O(0),
O(0),O(0),O(0),O(0),O(0),O(0),O(0),O(0),
/* rates 00-12 */
O(13),O(13),O(13),O(13),
O(12),O(12),O(12),O(12),
O(11),O(11),O(11),O(11),
O(10),O(10),O(10),O(10),
O( 9),O( 9),O( 9),O( 9),
O( 8),O( 8),O( 8),O( 8),
O( 7),O( 7),O( 7),O( 7),
O( 6),O( 6),O( 6),O( 6),
O( 5),O( 5),O( 5),O( 5),
O( 4),O( 4),O( 4),O( 4),
O( 3),O( 3),O( 3),O( 3),
O( 2),O( 2),O( 2),O( 2),
O( 1),O( 1),O( 1),O( 1),
/* rate 13 */
O( 0),O( 0),O( 0),O( 0),
/* rate 14 */
O( 0),O( 0),O( 0),O( 0),
/* rate 15 */
O( 0),O( 0),O( 0),O( 0),
/* 16 dummy rates (same as 15 3) */
O( 0),O( 0),O( 0),O( 0),O( 0),O( 0),O( 0),O( 0),
O( 0),O( 0),O( 0),O( 0),O( 0),O( 0),O( 0),O( 0),
};
#undef O
/* multiple table */
#define ML 2
static const UINT8 mul_tab[16]= {
/* 1/2, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,10,12,12,15,15 */
0.50*ML, 1.00*ML, 2.00*ML, 3.00*ML, 4.00*ML, 5.00*ML, 6.00*ML, 7.00*ML,
8.00*ML, 9.00*ML,10.00*ML,10.00*ML,12.00*ML,12.00*ML,15.00*ML,15.00*ML
};
#undef ML
/* TL_TAB_LEN is calculated as:
* 11 - sinus amplitude bits (Y axis)
* 2 - sinus sign bit (Y axis)
* TL_RES_LEN - sinus resolution (X axis)
*/
#define TL_TAB_LEN (11*2*TL_RES_LEN)
static signed int tl_tab[TL_TAB_LEN];
#define ENV_QUIET (TL_TAB_LEN>>5)
/* sin waveform table in 'decibel' scale */
/* two waveforms on OPLL type chips */
static unsigned int sin_tab[SIN_LEN * 2];
/* LFO Amplitude Modulation table (verified on real YM3812)
27 output levels (triangle waveform); 1 level takes one of: 192, 256 or 448 samples
Length: 210 elements.
Each of the elements has to be repeated
exactly 64 times (on 64 consecutive samples).
The whole table takes: 64 * 210 = 13440 samples.
We use data>>1, until we find what it really is on real chip...
*/
#define LFO_AM_TAB_ELEMENTS 210
static const UINT8 lfo_am_table[LFO_AM_TAB_ELEMENTS] = {
0,0,0,0,0,0,0,
1,1,1,1,
2,2,2,2,
3,3,3,3,
4,4,4,4,
5,5,5,5,
6,6,6,6,
7,7,7,7,
8,8,8,8,
9,9,9,9,
10,10,10,10,
11,11,11,11,
12,12,12,12,
13,13,13,13,
14,14,14,14,
15,15,15,15,
16,16,16,16,
17,17,17,17,
18,18,18,18,
19,19,19,19,
20,20,20,20,
21,21,21,21,
22,22,22,22,
23,23,23,23,
24,24,24,24,
25,25,25,25,
26,26,26,
25,25,25,25,
24,24,24,24,
23,23,23,23,
22,22,22,22,
21,21,21,21,
20,20,20,20,
19,19,19,19,
18,18,18,18,
17,17,17,17,
16,16,16,16,
15,15,15,15,
14,14,14,14,
13,13,13,13,
12,12,12,12,
11,11,11,11,
10,10,10,10,
9,9,9,9,
8,8,8,8,
7,7,7,7,
6,6,6,6,
5,5,5,5,
4,4,4,4,
3,3,3,3,
2,2,2,2,
1,1,1,1
};
/* LFO Phase Modulation table (verified on real YM2413) */
static const INT8 lfo_pm_table[8*8] = {
/* FNUM2/FNUM = 0 00xxxxxx (0x0000) */
0, 0, 0, 0, 0, 0, 0, 0,
/* FNUM2/FNUM = 0 01xxxxxx (0x0040) */
1, 0, 0, 0,-1, 0, 0, 0,
/* FNUM2/FNUM = 0 10xxxxxx (0x0080) */
2, 1, 0,-1,-2,-1, 0, 1,
/* FNUM2/FNUM = 0 11xxxxxx (0x00C0) */
3, 1, 0,-1,-3,-1, 0, 1,
/* FNUM2/FNUM = 1 00xxxxxx (0x0100) */
4, 2, 0,-2,-4,-2, 0, 2,
/* FNUM2/FNUM = 1 01xxxxxx (0x0140) */
5, 2, 0,-2,-5,-2, 0, 2,
/* FNUM2/FNUM = 1 10xxxxxx (0x0180) */
6, 3, 0,-3,-6,-3, 0, 3,
/* FNUM2/FNUM = 1 11xxxxxx (0x01C0) */
7, 3, 0,-3,-7,-3, 0, 3,
};
/* This is not 100% perfect yet but very close */
/*
- multi parameters are 100% correct (instruments and drums)
- LFO PM and AM enable are 100% correct
- waveform DC and DM select are 100% correct
*/
static const unsigned char table[19][8] = {
/* MULT MULT modTL DcDmFb AR/DR AR/DR SL/RR SL/RR */
/* 0 1 2 3 4 5 6 7 */
{0x49, 0x4c, 0x4c, 0x12, 0x00, 0x00, 0x00, 0x00 }, /* 0 */
{0x61, 0x61, 0x1e, 0x17, 0xf0, 0x78, 0x00, 0x17 }, /* 1 */
{0x13, 0x41, 0x1e, 0x0d, 0xd7, 0xf7, 0x13, 0x13 }, /* 2 */
{0x13, 0x01, 0x99, 0x04, 0xf2, 0xf4, 0x11, 0x23 }, /* 3 */
{0x21, 0x61, 0x1b, 0x07, 0xaf, 0x64, 0x40, 0x27 }, /* 4 */
/* {0x22, 0x21, 0x1e, 0x09, 0xf0, 0x76, 0x08, 0x28 }, //5 */
{0x22, 0x21, 0x1e, 0x06, 0xf0, 0x75, 0x08, 0x18 }, /* 5 */
/* {0x31, 0x22, 0x16, 0x09, 0x90, 0x7f, 0x00, 0x08 }, //6 */
{0x31, 0x22, 0x16, 0x05, 0x90, 0x71, 0x00, 0x13 }, /* 6 */
{0x21, 0x61, 0x1d, 0x07, 0x82, 0x80, 0x10, 0x17 }, /* 7 */
{0x23, 0x21, 0x2d, 0x16, 0xc0, 0x70, 0x07, 0x07 }, /* 8 */
{0x61, 0x61, 0x1b, 0x06, 0x64, 0x65, 0x10, 0x17 }, /* 9 */
/* {0x61, 0x61, 0x0c, 0x08, 0x85, 0xa0, 0x79, 0x07 }, //A */
{0x61, 0x61, 0x0c, 0x18, 0x85, 0xf0, 0x70, 0x07 }, /* A */
{0x23, 0x01, 0x07, 0x11, 0xf0, 0xa4, 0x00, 0x22 }, /* B */
{0x97, 0xc1, 0x24, 0x07, 0xff, 0xf8, 0x22, 0x12 }, /* C */
/* {0x61, 0x10, 0x0c, 0x08, 0xf2, 0xc4, 0x40, 0xc8 }, //D */
{0x61, 0x10, 0x0c, 0x05, 0xf2, 0xf4, 0x40, 0x44 }, /* D */
{0x01, 0x01, 0x55, 0x03, 0xf3, 0x92, 0xf3, 0xf3 }, /* E */
{0x61, 0x41, 0x89, 0x03, 0xf1, 0xf4, 0xf0, 0x13 }, /* F */
/* drum instruments definitions */
/* MULTI MULTI modTL xxx AR/DR AR/DR SL/RR SL/RR */
/* 0 1 2 3 4 5 6 7 */
{0x01, 0x01, 0x16, 0x00, 0xfd, 0xf8, 0x2f, 0x6d },/* BD(multi verified, modTL verified, mod env - verified(close), carr. env verifed) */
{0x01, 0x01, 0x00, 0x00, 0xd8, 0xd8, 0xf9, 0xf8 },/* HH(multi verified), SD(multi not used) */
{0x05, 0x01, 0x00, 0x00, 0xf8, 0xba, 0x49, 0x55 },/* TOM(multi,env verified), TOP CYM(multi verified, env verified) */
};
static const unsigned char table_vrc7[15][8] =
{
/* VRC7 instruments, January 17, 2004 update -Xodnizel */
{0x03, 0x21, 0x04, 0x06, 0x8D, 0xF2, 0x42, 0x17},
{0x13, 0x41, 0x05, 0x0E, 0x99, 0x96, 0x63, 0x12},
{0x31, 0x11, 0x10, 0x0A, 0xF0, 0x9C, 0x32, 0x02},
{0x21, 0x61, 0x1D, 0x07, 0x9F, 0x64, 0x20, 0x27},
{0x22, 0x21, 0x1E, 0x06, 0xF0, 0x76, 0x08, 0x28},
{0x02, 0x01, 0x06, 0x00, 0xF0, 0xF2, 0x03, 0x95},
{0x21, 0x61, 0x1C, 0x07, 0x82, 0x81, 0x16, 0x07},
{0x23, 0x21, 0x1A, 0x17, 0xEF, 0x82, 0x25, 0x15},
{0x25, 0x11, 0x1F, 0x00, 0x86, 0x41, 0x20, 0x11},
{0x85, 0x01, 0x1F, 0x0F, 0xE4, 0xA2, 0x11, 0x12},
{0x07, 0xC1, 0x2B, 0x45, 0xB4, 0xF1, 0x24, 0xF4},
{0x61, 0x23, 0x11, 0x06, 0x96, 0x96, 0x13, 0x16},
{0x01, 0x02, 0xD3, 0x05, 0x82, 0xA2, 0x31, 0x51},
{0x61, 0x22, 0x0D, 0x02, 0xC3, 0x7F, 0x24, 0x05},
{0x21, 0x62, 0x0E, 0x00, 0xA1, 0xA0, 0x44, 0x17},
};
INLINE int limit( int val, int max, int min ) {
if ( val > max )
val = max;
else if ( val < min )
val = min;
return val;
}
/* advance LFO to next sample */
INLINE void advance_lfo(YM2413 *chip)
{
/* LFO */
chip->lfo_am_cnt += chip->lfo_am_inc;
if (chip->lfo_am_cnt >= ((UINT32)LFO_AM_TAB_ELEMENTS<<LFO_SH) ) /* lfo_am_table is 210 elements long */
chip->lfo_am_cnt -= ((UINT32)LFO_AM_TAB_ELEMENTS<<LFO_SH);
chip->LFO_AM = lfo_am_table[ chip->lfo_am_cnt >> LFO_SH ] >> 1;
chip->lfo_pm_cnt += chip->lfo_pm_inc;
chip->LFO_PM = (chip->lfo_pm_cnt>>LFO_SH) & 7;
}
/* advance to next sample */
INLINE void advance(YM2413 *chip)
{
OPLL_CH *CH;
OPLL_SLOT *op;
unsigned int i;
/* Envelope Generator */
chip->eg_timer += chip->eg_timer_add;
while (chip->eg_timer >= chip->eg_timer_overflow)
{
chip->eg_timer -= chip->eg_timer_overflow;
chip->eg_cnt++;
for (i=0; i<9*2; i++)
{
CH = &chip->P_CH[i/2];
op = &CH->SLOT[i&1];
switch(op->state)
{
case EG_DMP: /* dump phase */
/*dump phase is performed by both operators in each channel*/
/*when CARRIER envelope gets down to zero level,
** phases in BOTH opearators are reset (at the same time ?)
*/
if ( !(chip->eg_cnt & ((1<<op->eg_sh_dp)-1) ) )
{
op->volume += eg_inc[op->eg_sel_dp + ((chip->eg_cnt>>op->eg_sh_dp)&7)];
if ( op->volume >= MAX_ATT_INDEX )
{
op->volume = MAX_ATT_INDEX;
op->state = EG_ATT;
/* restart Phase Generator */
op->phase = 0;
}
}
break;
case EG_ATT: /* attack phase */
if ( !(chip->eg_cnt & ((1<<op->eg_sh_ar)-1) ) )
{
op->volume += (~op->volume *
(eg_inc[op->eg_sel_ar + ((chip->eg_cnt>>op->eg_sh_ar)&7)])
) >>2;
if (op->volume <= MIN_ATT_INDEX)
{
op->volume = MIN_ATT_INDEX;
op->state = EG_DEC;
}
}
break;
case EG_DEC: /* decay phase */
if ( !(chip->eg_cnt & ((1<<op->eg_sh_dr)-1) ) )
{
op->volume += eg_inc[op->eg_sel_dr + ((chip->eg_cnt>>op->eg_sh_dr)&7)];
if ( op->volume >= (INT32)(op->sl) )
op->state = EG_SUS;
}
break;
case EG_SUS: /* sustain phase */
/* this is important behaviour:
one can change percusive/non-percussive modes on the fly and
the chip will remain in sustain phase - verified on real YM3812 */
if(op->eg_type) /* non-percussive mode (sustained tone) */
{
/* do nothing */
}
else /* percussive mode */
{
/* during sustain phase chip adds Release Rate (in percussive mode) */
if ( !(chip->eg_cnt & ((1<<op->eg_sh_rr)-1) ) )
{
op->volume += eg_inc[op->eg_sel_rr + ((chip->eg_cnt>>op->eg_sh_rr)&7)];
if ( op->volume >= MAX_ATT_INDEX )
op->volume = MAX_ATT_INDEX;
}
/* else do nothing in sustain phase */
}
break;
case EG_REL: /* release phase */
/* exclude modulators in melody channels from performing anything in this mode*/
/* allowed are only carriers in melody mode and rhythm slots in rhythm mode */
/*This table shows which operators and on what conditions are allowed to perform EG_REL:
(a) - always perform EG_REL
(n) - never perform EG_REL
(r) - perform EG_REL in Rhythm mode ONLY
0: 0 (n), 1 (a)
1: 2 (n), 3 (a)
2: 4 (n), 5 (a)
3: 6 (n), 7 (a)
4: 8 (n), 9 (a)
5: 10(n), 11(a)
6: 12(r), 13(a)
7: 14(r), 15(a)
8: 16(r), 17(a)
*/
if ( (i&1) || ((chip->rhythm&0x20) && (i>=12)) )/* exclude modulators */
{
if(op->eg_type) /* non-percussive mode (sustained tone) */
/*this is correct: use RR when SUS = OFF*/
/*and use RS when SUS = ON*/
{
if (CH->sus)
{
if ( !(chip->eg_cnt & ((1<<op->eg_sh_rs)-1) ) )
{
op->volume += eg_inc[op->eg_sel_rs + ((chip->eg_cnt>>op->eg_sh_rs)&7)];
if ( op->volume >= MAX_ATT_INDEX )
{
op->volume = MAX_ATT_INDEX;
op->state = EG_OFF;
}
}
}
else
{
if ( !(chip->eg_cnt & ((1<<op->eg_sh_rr)-1) ) )
{
op->volume += eg_inc[op->eg_sel_rr + ((chip->eg_cnt>>op->eg_sh_rr)&7)];
if ( op->volume >= MAX_ATT_INDEX )
{
op->volume = MAX_ATT_INDEX;
op->state = EG_OFF;
}
}
}
}
else /* percussive mode */
{
if ( !(chip->eg_cnt & ((1<<op->eg_sh_rs)-1) ) )
{
op->volume += eg_inc[op->eg_sel_rs + ((chip->eg_cnt>>op->eg_sh_rs)&7)];
if ( op->volume >= MAX_ATT_INDEX )
{
op->volume = MAX_ATT_INDEX;
op->state = EG_OFF;
}
}
}
}
break;
default:
break;
}
}
}
for (i=0; i<9*2; i++)
{
CH = &chip->P_CH[i/2];
op = &CH->SLOT[i&1];
/* Phase Generator */
if(op->vib)
{
UINT8 block;
unsigned int fnum_lfo = 8*((CH->block_fnum&0x01c0) >> 6);
unsigned int block_fnum = CH->block_fnum * 2;
signed int lfo_fn_table_index_offset = lfo_pm_table[chip->LFO_PM + fnum_lfo ];
if (lfo_fn_table_index_offset) /* LFO phase modulation active */
{
block_fnum += lfo_fn_table_index_offset;
block = (block_fnum&0x1c00) >> 10;
op->phase += (chip->fn_tab[block_fnum&0x03ff] >> (7-block)) * op->mul;
}
else /* LFO phase modulation = zero */
{
op->phase += op->freq;
}
}
else /* LFO phase modulation disabled for this operator */
{
op->phase += op->freq;
}
}
/* The Noise Generator of the YM3812 is 23-bit shift register.
* Period is equal to 2^23-2 samples.
* Register works at sampling frequency of the chip, so output
* can change on every sample.
*
* Output of the register and input to the bit 22 is:
* bit0 XOR bit14 XOR bit15 XOR bit22
*
* Simply use bit 22 as the noise output.
*/
chip->noise_p += chip->noise_f;
i = chip->noise_p >> FREQ_SH; /* number of events (shifts of the shift register) */
chip->noise_p &= FREQ_MASK;
while (i)
{
/*
UINT32 j;
j = ( (chip->noise_rng) ^ (chip->noise_rng>>14) ^ (chip->noise_rng>>15) ^ (chip->noise_rng>>22) ) & 1;
chip->noise_rng = (j<<22) | (chip->noise_rng>>1);
*/
/*
Instead of doing all the logic operations above, we
use a trick here (and use bit 0 as the noise output).
The difference is only that the noise bit changes one
step ahead. This doesn't matter since we don't know
what is real state of the noise_rng after the reset.
*/
if (chip->noise_rng & 1) chip->noise_rng ^= 0x800302;
chip->noise_rng >>= 1;
i--;
}
}
INLINE signed int op_calc(UINT32 phase, unsigned int env, signed int pm, unsigned int wave_tab)
{
UINT32 p;
p = (env<<5) + sin_tab[wave_tab + ((((signed int)((phase & ~FREQ_MASK) + (pm<<17))) >> FREQ_SH ) & SIN_MASK) ];
if (p >= TL_TAB_LEN)
return 0;
return tl_tab[p];
}
INLINE signed int op_calc1(UINT32 phase, unsigned int env, signed int pm, unsigned int wave_tab)
{
UINT32 p;
INT32 i;
i = (phase & ~FREQ_MASK) + pm;
/*logerror("i=%08x (i>>16)&511=%8i phase=%i [pm=%08x] ",i, (i>>16)&511, phase>>FREQ_SH, pm);*/
p = (env<<5) + sin_tab[ wave_tab + ((i>>FREQ_SH) & SIN_MASK)];
/*logerror("(p&255=%i p>>8=%i) out= %i\n", p&255,p>>8, tl_tab[p&255]>>(p>>8) );*/
if (p >= TL_TAB_LEN)
return 0;
return tl_tab[p];
}
#define volume_calc(OP) ((OP)->TLL + ((UINT32)(OP)->volume) + (chip->LFO_AM & (OP)->AMmask))
/* calculate output */
INLINE void chan_calc( YM2413 *chip, OPLL_CH *CH )
{
OPLL_SLOT *SLOT;
unsigned int env;
signed int out;
signed int phase_modulation; /* phase modulation input (SLOT 2) */
/* SLOT 1 */
SLOT = &CH->SLOT[SLOT1];
env = volume_calc(SLOT);
out = SLOT->op1_out[0] + SLOT->op1_out[1];
SLOT->op1_out[0] = SLOT->op1_out[1];
phase_modulation = SLOT->op1_out[0];
SLOT->op1_out[1] = 0;
if( env < ENV_QUIET )
{
if (!SLOT->fb_shift)
out = 0;
SLOT->op1_out[1] = op_calc1(SLOT->phase, env, (out<<SLOT->fb_shift), SLOT->wavetable );
}
/* SLOT 2 */
SLOT++;
env = volume_calc(SLOT);
if( env < ENV_QUIET )
{
signed int outp = op_calc(SLOT->phase, env, phase_modulation, SLOT->wavetable);
chip->output[0] += outp;
/* output[0] += op_calc(SLOT->phase, env, phase_modulation, SLOT->wavetable); */
}
}
/*
operators used in the rhythm sounds generation process:
Envelope Generator:
channel operator register number Bass High Snare Tom Top
/ slot number TL ARDR SLRR Wave Drum Hat Drum Tom Cymbal
6 / 0 12 50 70 90 f0 +
6 / 1 15 53 73 93 f3 +
7 / 0 13 51 71 91 f1 +
7 / 1 16 54 74 94 f4 +
8 / 0 14 52 72 92 f2 +
8 / 1 17 55 75 95 f5 +
Phase Generator:
channel operator register number Bass High Snare Tom Top
/ slot number MULTIPLE Drum Hat Drum Tom Cymbal
6 / 0 12 30 +
6 / 1 15 33 +
7 / 0 13 31 + + +
7 / 1 16 34 ----- n o t u s e d -----
8 / 0 14 32 +
8 / 1 17 35 + +
channel operator register number Bass High Snare Tom Top
number number BLK/FNUM2 FNUM Drum Hat Drum Tom Cymbal
6 12,15 B6 A6 +
7 13,16 B7 A7 + + +
8 14,17 B8 A8 + + +
*/
/* calculate rhythm */
INLINE void rhythm_calc( YM2413 *chip, OPLL_CH *CH, unsigned int noise )
{
OPLL_SLOT *SLOT;
signed int out;
unsigned int env;
signed int phase_modulation; /* phase modulation input (SLOT 2) */
/* Bass Drum (verified on real YM3812):
- depends on the channel 6 'connect' register:
when connect = 0 it works the same as in normal (non-rhythm) mode (op1->op2->out)
when connect = 1 _only_ operator 2 is present on output (op2->out), operator 1 is ignored
- output sample always is multiplied by 2
*/
/* SLOT 1 */
if ( !(chip->mask & OPLL_MASK_BD) )
{
SLOT = &CH[6].SLOT[SLOT1];
env = volume_calc(SLOT);
out = SLOT->op1_out[0] + SLOT->op1_out[1];
SLOT->op1_out[0] = SLOT->op1_out[1];
phase_modulation = SLOT->op1_out[0];
SLOT->op1_out[1] = 0;
if( env < ENV_QUIET )
{
if (!SLOT->fb_shift)
out = 0;
SLOT->op1_out[1] = op_calc1(SLOT->phase, env, (out<<SLOT->fb_shift), SLOT->wavetable );
}
/* SLOT 2 */
SLOT++;
env = volume_calc(SLOT);
if( env < ENV_QUIET )
chip->output[1] += op_calc(SLOT->phase, env, phase_modulation, SLOT->wavetable) * 2;
}
/* Phase generation is based on:
HH (13) channel 7->slot 1 combined with channel 8->slot 2 (same combination as TOP CYMBAL but different output phases)
SD (16) channel 7->slot 1
TOM (14) channel 8->slot 1
TOP (17) channel 7->slot 1 combined with channel 8->slot 2 (same combination as HIGH HAT but different output phases) */
/* Envelope generation based on:
HH channel 7->slot1
SD channel 7->slot2
TOM channel 8->slot1
TOP channel 8->slot2 */
/* The following formulas can be well optimized.
I leave them in direct form for now (in case I've missed something).
*/
/* High Hat (verified on real YM3812) */
if ( !(chip->mask & OPLL_MASK_HH) )
{
env = volume_calc(chip->SLOT7_1);
if( env < ENV_QUIET )
{
/* high hat phase generation:
phase = d0 or 234 (based on frequency only)
phase = 34 or 2d0 (based on noise)
*/
/* base frequency derived from operator 1 in channel 7 */
unsigned char bit7 = ((chip->SLOT7_1->phase>>FREQ_SH)>>7)&1;
unsigned char bit3 = ((chip->SLOT7_1->phase>>FREQ_SH)>>3)&1;
unsigned char bit2 = ((chip->SLOT7_1->phase>>FREQ_SH)>>2)&1;
unsigned char res1 = (bit2 ^ bit7) | bit3;
/* when res1 = 0 phase = 0x000 | 0xd0; */
/* when res1 = 1 phase = 0x200 | (0xd0>>2); */
UINT32 phase = res1 ? (0x200|(0xd0>>2)) : 0xd0;
/* enable gate based on frequency of operator 2 in channel 8 */
unsigned char bit5e= ((chip->SLOT8_2->phase>>FREQ_SH)>>5)&1;
unsigned char bit3e= ((chip->SLOT8_2->phase>>FREQ_SH)>>3)&1;
unsigned char res2 = (bit3e | bit5e);
/* when res2 = 0 pass the phase from calculation above (res1); */
/* when res2 = 1 phase = 0x200 | (0xd0>>2); */
if (res2)
phase = (0x200|(0xd0>>2));
/* when phase & 0x200 is set and noise=1 then phase = 0x200|0xd0 */
/* when phase & 0x200 is set and noise=0 then phase = 0x200|(0xd0>>2), ie no change */
if (phase&0x200)
{
if (noise)
phase = 0x200|0xd0;
}
else
/* when phase & 0x200 is clear and noise=1 then phase = 0xd0>>2 */
/* when phase & 0x200 is clear and noise=0 then phase = 0xd0, ie no change */
{
if (noise)
phase = 0xd0>>2;
}
chip->output[1] += op_calc(phase<<FREQ_SH, env, 0, chip->SLOT7_1->wavetable) * 2;
}
}
/* Snare Drum (verified on real YM3812) */
if ( !(chip->mask & OPLL_MASK_SD) )
{
env = volume_calc(chip->SLOT7_2);
if( env < ENV_QUIET )
{
/* base frequency derived from operator 1 in channel 7 */
unsigned char bit8 = ((chip->SLOT7_1->phase>>FREQ_SH)>>8)&1;
/* when bit8 = 0 phase = 0x100; */
/* when bit8 = 1 phase = 0x200; */
UINT32 phase = bit8 ? 0x200 : 0x100;
/* Noise bit XOR'es phase by 0x100 */
/* when noisebit = 0 pass the phase from calculation above */
/* when noisebit = 1 phase ^= 0x100; */
/* in other words: phase ^= (noisebit<<8); */
if (noise)
phase ^= 0x100;
chip->output[1] += op_calc(phase<<FREQ_SH, env, 0, chip->SLOT7_2->wavetable) * 2;
}
}
/* Tom Tom (verified on real YM3812) */
if ( !(chip->mask & OPLL_MASK_TOM) )
{
env = volume_calc(chip->SLOT8_1);
if( env < ENV_QUIET )
chip->output[1] += op_calc(chip->SLOT8_1->phase, env, 0, chip->SLOT8_1->wavetable) * 2;
}
/* Top Cymbal (verified on real YM2413) */
if ( !(chip->mask & OPLL_MASK_CYM) )
{
env = volume_calc(chip->SLOT8_2);
if( env < ENV_QUIET )
{
/* base frequency derived from operator 1 in channel 7 */
unsigned char bit7 = ((chip->SLOT7_1->phase>>FREQ_SH)>>7)&1;
unsigned char bit3 = ((chip->SLOT7_1->phase>>FREQ_SH)>>3)&1;
unsigned char bit2 = ((chip->SLOT7_1->phase>>FREQ_SH)>>2)&1;
unsigned char res1 = (bit2 ^ bit7) | bit3;
/* when res1 = 0 phase = 0x000 | 0x100; */
/* when res1 = 1 phase = 0x200 | 0x100; */
UINT32 phase = res1 ? 0x300 : 0x100;
/* enable gate based on frequency of operator 2 in channel 8 */
unsigned char bit5e= ((chip->SLOT8_2->phase>>FREQ_SH)>>5)&1;
unsigned char bit3e= ((chip->SLOT8_2->phase>>FREQ_SH)>>3)&1;
unsigned char res2 = (bit3e | bit5e);
/* when res2 = 0 pass the phase from calculation above (res1); */
/* when res2 = 1 phase = 0x200 | 0x100; */
if (res2)
phase = 0x300;
chip->output[1] += op_calc(phase<<FREQ_SH, env, 0, chip->SLOT8_2->wavetable) * 2;
}
}
}
/* generic table initialize */
static int init_tables(void)
{
signed int i,x;
signed int n;
double o,m;
for (x=0; x<TL_RES_LEN; x++)
{
m = (1<<16) / pow(2, (x+1) * (ENV_STEP/4.0) / 8.0);
m = floor(m);
/* we never reach (1<<16) here due to the (x+1) */
/* result fits within 16 bits at maximum */
n = (int)m; /* 16 bits here */
n >>= 4; /* 12 bits here */
if (n&1) /* round to nearest */
n = (n>>1)+1;
else
n = n>>1;
/* 11 bits here (rounded) */
tl_tab[ x*2 + 0 ] = n;
tl_tab[ x*2 + 1 ] = -tl_tab[ x*2 + 0 ];
for (i=1; i<11; i++)
{
tl_tab[ x*2+0 + i*2*TL_RES_LEN ] = tl_tab[ x*2+0 ]>>i;
tl_tab[ x*2+1 + i*2*TL_RES_LEN ] = -tl_tab[ x*2+0 + i*2*TL_RES_LEN ];
}
#if 0
logerror("tl %04i", x*2);
for (i=0; i<11; i++)
logerror(", [%02i] %5i", i*2, tl_tab[ x*2 /*+1*/ + i*2*TL_RES_LEN ] );
logerror("\n");
#endif
}
/*logerror("ym2413.c: TL_TAB_LEN = %i elements (%i bytes)\n",TL_TAB_LEN, (int)sizeof(tl_tab));*/
for (i=0; i<SIN_LEN; i++)
{
/* non-standard sinus */
m = sin( ((i*2)+1) * M_PI / SIN_LEN ); /* checked against the real chip */
/* we never reach zero here due to ((i*2)+1) */
if (m>0.0)
o = 8*log(1.0/m)/log(2.0); /* convert to 'decibels' */
else
o = 8*log(-1.0/m)/log(2.0); /* convert to 'decibels' */
o = o / (ENV_STEP/4);
n = (int)(2.0*o);
if (n&1) /* round to nearest */
n = (n>>1)+1;
else
n = n>>1;
/* waveform 0: standard sinus */
sin_tab[ i ] = n*2 + (m>=0.0? 0: 1 );
/*logerror("ym2413.c: sin [%4i (hex=%03x)]= %4i (tl_tab value=%5i)\n", i, i, sin_tab[i], tl_tab[sin_tab[i]] );*/
/* waveform 1: __ __ */
/* / \____/ \____*/
/* output only first half of the sinus waveform (positive one) */
if (i & (1<<(SIN_BITS-1)) )
sin_tab[1*SIN_LEN+i] = TL_TAB_LEN;
else
sin_tab[1*SIN_LEN+i] = sin_tab[i];
/*logerror("ym2413.c: sin1[%4i]= %4i (tl_tab value=%5i)\n", i, sin_tab[1*SIN_LEN+i], tl_tab[sin_tab[1*SIN_LEN+i]] );*/
}
#if 0
logerror("YM2413.C: ENV_QUIET= %08x (*32=%08x)\n", ENV_QUIET, ENV_QUIET*32 );
for (i=0; i<ENV_QUIET; i++)
{
logerror("tl_tb[%4x(%4i)]=%8x\n", i<<5, i, tl_tab[i<<5] );
}
#endif
#ifdef SAVE_SAMPLE
sample[0]=fopen("sampsum.pcm","wb");
#endif
return 1;
}
static void OPLL_initalize(YM2413 *chip)
{
int i;
/* frequency base */
chip->freqbase = (chip->rate) ? ((double)chip->clock / 72.0) / chip->rate : 0;
if ( fabs( chip->freqbase - 1.0 ) < 0.0000001 )
chip->freqbase = 1.0;
#if 0
chip->rate = (double)chip->clock / 72.0;
chip->freqbase = 1.0;
logerror("freqbase=%f\n", chip->freqbase);
#endif
/* make fnumber -> increment counter table */
for( i = 0 ; i < 1024; i++ )
{
/* OPLL (YM2413) phase increment counter = 18bit */
chip->fn_tab[i] = (UINT32)( (double)i * 64 * chip->freqbase * (1<<(FREQ_SH-10)) ); /* -10 because chip works with 10.10 fixed point, while we use 16.16 */
#if 0
logerror("ym2413.c: fn_tab[%4i] = %08x (dec=%8i)\n",
i, chip->fn_tab[i]>>6, chip->fn_tab[i]>>6 );
#endif
}
#if 0
for( i=0 ; i < 16 ; i++ )
{
logerror("ym2413.c: sl_tab[%i] = %08x\n", i, sl_tab[i] );
}
for( i=0 ; i < 8 ; i++ )
{
int j;
logerror("ym2413.c: ksl_tab[oct=%2i] =",i);
for (j=0; j<16; j++)
{
logerror("%08x ", ksl_tab[i*16+j] );
}
logerror("\n");
}
#endif
/* Amplitude modulation: 27 output levels (triangle waveform); 1 level takes one of: 192, 256 or 448 samples */
/* One entry from LFO_AM_TABLE lasts for 64 samples */
chip->lfo_am_inc = (1.0 / 64.0 ) * (1<<LFO_SH) * chip->freqbase;
/* Vibrato: 8 output levels (triangle waveform); 1 level takes 1024 samples */
chip->lfo_pm_inc = (1.0 / 1024.0) * (1<<LFO_SH) * chip->freqbase;
/*logerror ("chip->lfo_am_inc = %8x ; chip->lfo_pm_inc = %8x\n", chip->lfo_am_inc, chip->lfo_pm_inc);*/
/* Noise generator: a step takes 1 sample */
chip->noise_f = (1.0 / 1.0) * (1<<FREQ_SH) * chip->freqbase;
/*logerror("YM2413init noise_f=%8x\n", chip->noise_f);*/
chip->eg_timer_add = (1<<EG_SH) * chip->freqbase;
chip->eg_timer_overflow = ( 1 ) * (1<<EG_SH);
/*logerror("YM2413init eg_timer_add=%8x eg_timer_overflow=%8x\n", chip->eg_timer_add, chip->eg_timer_overflow);*/
}
INLINE void KEY_ON(OPLL_SLOT *SLOT, UINT32 key_set)
{
if( !SLOT->key )
{
/* do NOT restart Phase Generator (verified on real YM2413)*/
/* phase -> Dump */
SLOT->state = EG_DMP;
}
SLOT->key |= key_set;
}
INLINE void KEY_OFF(OPLL_SLOT *SLOT, UINT32 key_clr)
{
if( SLOT->key )
{
SLOT->key &= key_clr;
if( !SLOT->key )
{
/* phase -> Release */
if (SLOT->state>EG_REL)
SLOT->state = EG_REL;
}
}
}
/* update phase increment counter of operator (also update the EG rates if necessary) */
INLINE void CALC_FCSLOT(OPLL_CH *CH,OPLL_SLOT *SLOT)
{
int ksr;
UINT32 SLOT_rs;
UINT32 SLOT_dp;
/* (frequency) phase increment counter */
SLOT->freq = CH->fc * SLOT->mul;
ksr = CH->kcode >> SLOT->KSR;
if( SLOT->ksr != ksr )
{
SLOT->ksr = ksr;
/* calculate envelope generator rates */
if ((SLOT->ar + SLOT->ksr) < 16+62)
{
SLOT->eg_sh_ar = eg_rate_shift [SLOT->ar + SLOT->ksr ];
SLOT->eg_sel_ar = eg_rate_select[SLOT->ar + SLOT->ksr ];
}
else
{
SLOT->eg_sh_ar = 0;
SLOT->eg_sel_ar = 13*RATE_STEPS;
}
SLOT->eg_sh_dr = eg_rate_shift [SLOT->dr + SLOT->ksr ];
SLOT->eg_sel_dr = eg_rate_select[SLOT->dr + SLOT->ksr ];
SLOT->eg_sh_rr = eg_rate_shift [SLOT->rr + SLOT->ksr ];
SLOT->eg_sel_rr = eg_rate_select[SLOT->rr + SLOT->ksr ];
}
if (CH->sus)
SLOT_rs = 16 + (5<<2);
else
SLOT_rs = 16 + (7<<2);
SLOT->eg_sh_rs = eg_rate_shift [SLOT_rs + SLOT->ksr ];
SLOT->eg_sel_rs = eg_rate_select[SLOT_rs + SLOT->ksr ];
SLOT_dp = 16 + (13<<2);
SLOT->eg_sh_dp = eg_rate_shift [SLOT_dp + SLOT->ksr ];
SLOT->eg_sel_dp = eg_rate_select[SLOT_dp + SLOT->ksr ];
}
/* set multi,am,vib,EG-TYP,KSR,mul */
INLINE void set_mul(YM2413 *chip,int slot,int v)
{
OPLL_CH *CH = &chip->P_CH[slot/2];
OPLL_SLOT *SLOT = &CH->SLOT[slot&1];
SLOT->mul = mul_tab[v&0x0f];
SLOT->KSR = (v&0x10) ? 0 : 2;
SLOT->eg_type = (v&0x20);
SLOT->vib = (v&0x40);
SLOT->AMmask = (v&0x80) ? ~0 : 0;
CALC_FCSLOT(CH,SLOT);
}
/* set ksl, tl */
INLINE void set_ksl_tl(YM2413 *chip,int chan,int v)
{
int ksl;
OPLL_CH *CH = &chip->P_CH[chan];
/* modulator */
OPLL_SLOT *SLOT = &CH->SLOT[SLOT1];
ksl = v>>6; /* 0 / 1.5 / 3.0 / 6.0 dB/OCT */
SLOT->ksl = ksl ? 3-ksl : 31;
SLOT->TL = (v&0x3f)<<(ENV_BITS-2-7); /* 7 bits TL (bit 6 = always 0) */
SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
}
/* set ksl , waveforms, feedback */
INLINE void set_ksl_wave_fb(YM2413 *chip,int chan,int v)
{
int ksl;
OPLL_CH *CH = &chip->P_CH[chan];
/* modulator */
OPLL_SLOT *SLOT = &CH->SLOT[SLOT1];
SLOT->wavetable = ((v&0x08)>>3)*SIN_LEN;
SLOT->fb_shift = (v&7) ? (v&7) + 8 : 0;
/*carrier*/
SLOT = &CH->SLOT[SLOT2];
ksl = v>>6; /* 0 / 1.5 / 3.0 / 6.0 dB/OCT */
SLOT->ksl = ksl ? 3-ksl : 31;
SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
SLOT->wavetable = ((v&0x10)>>4)*SIN_LEN;
}
/* set attack rate & decay rate */
INLINE void set_ar_dr(YM2413 *chip,int slot,int v)
{
OPLL_CH *CH = &chip->P_CH[slot/2];
OPLL_SLOT *SLOT = &CH->SLOT[slot&1];
SLOT->ar = (v>>4) ? 16 + ((v>>4) <<2) : 0;
if ((SLOT->ar + SLOT->ksr) < 16+62)
{
SLOT->eg_sh_ar = eg_rate_shift [SLOT->ar + SLOT->ksr ];
SLOT->eg_sel_ar = eg_rate_select[SLOT->ar + SLOT->ksr ];
}
else
{
SLOT->eg_sh_ar = 0;
SLOT->eg_sel_ar = 13*RATE_STEPS;
}
SLOT->dr = (v&0x0f)? 16 + ((v&0x0f)<<2) : 0;
SLOT->eg_sh_dr = eg_rate_shift [SLOT->dr + SLOT->ksr ];
SLOT->eg_sel_dr = eg_rate_select[SLOT->dr + SLOT->ksr ];
}
/* set sustain level & release rate */
INLINE void set_sl_rr(YM2413 *chip,int slot,int v)
{
OPLL_CH *CH = &chip->P_CH[slot/2];
OPLL_SLOT *SLOT = &CH->SLOT[slot&1];
SLOT->sl = sl_tab[ v>>4 ];
SLOT->rr = (v&0x0f)? 16 + ((v&0x0f)<<2) : 0;
SLOT->eg_sh_rr = eg_rate_shift [SLOT->rr + SLOT->ksr ];
SLOT->eg_sel_rr = eg_rate_select[SLOT->rr + SLOT->ksr ];
}
static void load_instrument(YM2413 *chip, UINT32 chan, UINT32 slot, UINT8* inst )
{
set_mul (chip, slot, inst[0]);
set_mul (chip, slot+1, inst[1]);
set_ksl_tl (chip, chan, inst[2]);
set_ksl_wave_fb (chip, chan, inst[3]);
set_ar_dr (chip, slot, inst[4]);
set_ar_dr (chip, slot+1, inst[5]);
set_sl_rr (chip, slot, inst[6]);
set_sl_rr (chip, slot+1, inst[7]);
}
static void update_instrument_zero(YM2413 *chip, UINT8 r )
{
UINT8* inst = &chip->inst_tab[0][0]; /* point to user instrument */
UINT32 chan;
UINT32 chan_max;
chan_max = 9;
if (chip->rhythm & 0x20)
chan_max=6;
switch(r)
{
case 0:
for (chan=0; chan<chan_max; chan++)
{
if ((chip->instvol_r[chan]&0xf0)==0)
{
set_mul (chip, chan*2, inst[0]);
}
}
break;
case 1:
for (chan=0; chan<chan_max; chan++)
{
if ((chip->instvol_r[chan]&0xf0)==0)
{
set_mul (chip, chan*2+1,inst[1]);
}
}
break;
case 2:
for (chan=0; chan<chan_max; chan++)
{
if ((chip->instvol_r[chan]&0xf0)==0)
{
set_ksl_tl (chip, chan, inst[2]);
}
}
break;
case 3:
for (chan=0; chan<chan_max; chan++)
{
if ((chip->instvol_r[chan]&0xf0)==0)
{
set_ksl_wave_fb (chip, chan, inst[3]);
}
}
break;
case 4:
for (chan=0; chan<chan_max; chan++)
{
if ((chip->instvol_r[chan]&0xf0)==0)
{
set_ar_dr (chip, chan*2, inst[4]);
}
}
break;
case 5:
for (chan=0; chan<chan_max; chan++)
{
if ((chip->instvol_r[chan]&0xf0)==0)
{
set_ar_dr (chip, chan*2+1,inst[5]);
}
}
break;
case 6:
for (chan=0; chan<chan_max; chan++)
{
if ((chip->instvol_r[chan]&0xf0)==0)
{
set_sl_rr (chip, chan*2, inst[6]);
}
}
break;
case 7:
for (chan=0; chan<chan_max; chan++)
{
if ((chip->instvol_r[chan]&0xf0)==0)
{
set_sl_rr (chip, chan*2+1,inst[7]);
}
}
break;
}
}
/* write a value v to register r on chip chip */
static void OPLLWriteReg(YM2413 *chip, int r, int v)
{
OPLL_CH *CH;
OPLL_SLOT *SLOT;
UINT8 *inst;
int chan;
int slot;
/* adjust bus to 8 bits */
r &= 0xff;
v &= 0xff;
switch(r&0xf0)
{
case 0x00: /* 00-0f:control */
{
switch(r&0x0f)
{
case 0x00: /* AM/VIB/EGTYP/KSR/MULTI (modulator) */
case 0x01: /* AM/VIB/EGTYP/KSR/MULTI (carrier) */
case 0x02: /* Key Scale Level, Total Level (modulator) */
case 0x03: /* Key Scale Level, carrier waveform, modulator waveform, Feedback */
case 0x04: /* Attack, Decay (modulator) */
case 0x05: /* Attack, Decay (carrier) */
case 0x06: /* Sustain, Release (modulator) */
case 0x07: /* Sustain, Release (carrier) */
chip->inst_tab[0][r & 0x07] = v;
update_instrument_zero(chip,r&7);
break;
case 0x0e: /* x, x, r,bd,sd,tom,tc,hh */
{
if(v&0x20)
{
if ((chip->rhythm&0x20)==0)
/*rhythm off to on*/
{
/*logerror("YM2413: Rhythm mode enable\n");*/
/* Load instrument settings for channel seven(chan=6 since we're zero based). (Bass drum) */
chan = 6;
inst = &chip->inst_tab[16][0];
slot = chan*2;
load_instrument(chip, chan, slot, inst);
/* Load instrument settings for channel eight. (High hat and snare drum) */
chan = 7;
inst = &chip->inst_tab[17][0];
slot = chan*2;
load_instrument(chip, chan, slot, inst);
CH = &chip->P_CH[chan];
SLOT = &CH->SLOT[SLOT1]; /* modulator envelope is HH */
SLOT->TL = ((chip->instvol_r[chan]>>4)<<2)<<(ENV_BITS-2-7); /* 7 bits TL (bit 6 = always 0) */
SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
/* Load instrument settings for channel nine. (Tom-tom and top cymbal) */
chan = 8;
inst = &chip->inst_tab[18][0];
slot = chan*2;
load_instrument(chip, chan, slot, inst);
CH = &chip->P_CH[chan];
SLOT = &CH->SLOT[SLOT1]; /* modulator envelope is TOM */
SLOT->TL = ((chip->instvol_r[chan]>>4)<<2)<<(ENV_BITS-2-7); /* 7 bits TL (bit 6 = always 0) */
SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
}
/* BD key on/off */
if(v&0x10)
{
KEY_ON (&chip->P_CH[6].SLOT[SLOT1], 2);
KEY_ON (&chip->P_CH[6].SLOT[SLOT2], 2);
}
else
{
KEY_OFF(&chip->P_CH[6].SLOT[SLOT1],~2);
KEY_OFF(&chip->P_CH[6].SLOT[SLOT2],~2);
}
/* HH key on/off */
if(v&0x01) KEY_ON (&chip->P_CH[7].SLOT[SLOT1], 2);
else KEY_OFF(&chip->P_CH[7].SLOT[SLOT1],~2);
/* SD key on/off */
if(v&0x08) KEY_ON (&chip->P_CH[7].SLOT[SLOT2], 2);
else KEY_OFF(&chip->P_CH[7].SLOT[SLOT2],~2);
/* TOM key on/off */
if(v&0x04) KEY_ON (&chip->P_CH[8].SLOT[SLOT1], 2);
else KEY_OFF(&chip->P_CH[8].SLOT[SLOT1],~2);
/* TOP-CY key on/off */
if(v&0x02) KEY_ON (&chip->P_CH[8].SLOT[SLOT2], 2);
else KEY_OFF(&chip->P_CH[8].SLOT[SLOT2],~2);
}
else
{
if ((chip->rhythm&0x20)==1)
/*rhythm on to off*/
{
/*logerror("YM2413: Rhythm mode disable\n");*/
/* Load instrument settings for channel seven(chan=6 since we're zero based).*/
chan = 6;
inst = &chip->inst_tab[chip->instvol_r[chan]>>4][0];
slot = chan*2;
load_instrument(chip, chan, slot, inst);
/* Load instrument settings for channel eight.*/
chan = 7;
inst = &chip->inst_tab[chip->instvol_r[chan]>>4][0];
slot = chan*2;
load_instrument(chip, chan, slot, inst);
/* Load instrument settings for channel nine.*/
chan = 8;
inst = &chip->inst_tab[chip->instvol_r[chan]>>4][0];
slot = chan*2;
load_instrument(chip, chan, slot, inst);
}
/* BD key off */
KEY_OFF(&chip->P_CH[6].SLOT[SLOT1],~2);
KEY_OFF(&chip->P_CH[6].SLOT[SLOT2],~2);
/* HH key off */
KEY_OFF(&chip->P_CH[7].SLOT[SLOT1],~2);
/* SD key off */
KEY_OFF(&chip->P_CH[7].SLOT[SLOT2],~2);
/* TOM key off */
KEY_OFF(&chip->P_CH[8].SLOT[SLOT1],~2);
/* TOP-CY off */
KEY_OFF(&chip->P_CH[8].SLOT[SLOT2],~2);
}
chip->rhythm = v&0x3f;
}
break;
}
}
break;
case 0x10:
case 0x20:
{
UINT32 block_fnum;
chan = r&0x0f;
if (chan >= 9)
chan -= 9; /* verified on real YM2413 */
CH = &chip->P_CH[chan];
if(r&0x10)
{ /* 10-18: FNUM 0-7 */
block_fnum = (CH->block_fnum&0x0f00) | v;
}
else
{ /* 20-28: suson, keyon, block, FNUM 8 */
block_fnum = ((v&0x0f)<<8) | (CH->block_fnum&0xff);
if(v&0x10)
{
KEY_ON (&CH->SLOT[SLOT1], 1);
KEY_ON (&CH->SLOT[SLOT2], 1);
}
else
{
KEY_OFF(&CH->SLOT[SLOT1],~1);
KEY_OFF(&CH->SLOT[SLOT2],~1);
}
/*if (CH->sus!=(v&0x20))
logerror("chan=%i sus=%2x\n",chan,v&0x20);*/
CH->sus = v & 0x20;
}
/* update */
if(CH->block_fnum != block_fnum)
{
UINT8 block;
CH->block_fnum = block_fnum;
/* BLK 2,1,0 bits -> bits 3,2,1 of kcode, FNUM MSB -> kcode LSB */
CH->kcode = (block_fnum&0x0f00)>>8;
CH->ksl_base = ksl_tab[block_fnum>>5];
block_fnum = block_fnum * 2;
block = (block_fnum&0x1c00) >> 10;
CH->fc = chip->fn_tab[block_fnum&0x03ff] >> (7-block);
/* refresh Total Level in both SLOTs of this channel */
CH->SLOT[SLOT1].TLL = CH->SLOT[SLOT1].TL + (CH->ksl_base>>CH->SLOT[SLOT1].ksl);
CH->SLOT[SLOT2].TLL = CH->SLOT[SLOT2].TL + (CH->ksl_base>>CH->SLOT[SLOT2].ksl);
/* refresh frequency counter in both SLOTs of this channel */
CALC_FCSLOT(CH,&CH->SLOT[SLOT1]);
CALC_FCSLOT(CH,&CH->SLOT[SLOT2]);
}
}
break;
case 0x30: /* inst 4 MSBs, VOL 4 LSBs */
{
UINT8 old_instvol;
chan = r&0x0f;
if (chan >= 9)
chan -= 9; /* verified on real YM2413 */
old_instvol = chip->instvol_r[chan];
chip->instvol_r[chan] = v; /* store for later use */
CH = &chip->P_CH[chan];
SLOT = &CH->SLOT[SLOT2]; /* carrier */
SLOT->TL = ((v&0x0f)<<2)<<(ENV_BITS-2-7); /* 7 bits TL (bit 6 = always 0) */
SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
/*check wether we are in rhythm mode and handle instrument/volume register accordingly*/
if ((chan>=6) && (chip->rhythm&0x20))
{
/* we're in rhythm mode*/
if (chan>=7) /* only for channel 7 and 8 (channel 6 is handled in usual way)*/
{
SLOT = &CH->SLOT[SLOT1]; /* modulator envelope is HH(chan=7) or TOM(chan=8) */
SLOT->TL = ((chip->instvol_r[chan]>>4)<<2)<<(ENV_BITS-2-7); /* 7 bits TL (bit 6 = always 0) */
SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
}
}
else
{
if ( (old_instvol&0xf0) == (v&0xf0) )
return;
inst = &chip->inst_tab[chip->instvol_r[chan]>>4][0];
slot = chan*2;
load_instrument(chip, chan, slot, inst);
#if 0
logerror("YM2413: chan#%02i inst=%02i: (r=%2x, v=%2x)\n",chan,v>>4,r,v);
logerror(" 0:%2x 1:%2x\n",inst[0],inst[1]); logerror(" 2:%2x 3:%2x\n",inst[2],inst[3]);
logerror(" 4:%2x 5:%2x\n",inst[4],inst[5]); logerror(" 6:%2x 7:%2x\n",inst[6],inst[7]);
#endif
}
}
break;
default:
break;
}
}
/* lock/unlock for common table */
static void OPLLResetChip(YM2413 *chip)
{
int c,s;
int i;
chip->eg_timer = 0;
chip->eg_cnt = 0;
chip->noise_rng = 1; /* noise shift register */
chip->mask = 0;
/* setup instruments table */
if (!chip->chip_type)
{
for (i=0; i<19; i++)
{
for (c=0; c<8; c++)
{
chip->inst_tab[i][c] = table[i][c];
}
}
}
else
{
memset( &chip->inst_tab, 0, sizeof(chip->inst_tab) );
for (i=0; i<15; i++)
{
for (c=0; c<8; c++)
{
chip->inst_tab[i+1][c] = table_vrc7[i][c];
}
}
}
/* reset with register write */
OPLLWriteReg(chip,0x0f,0); /*test reg*/
for(i = 0x3f ; i >= 0x10 ; i-- ) OPLLWriteReg(chip,i,0x00);
/* reset operator parameters */
for( c = 0 ; c < 9 ; c++ )
{
OPLL_CH *CH = &chip->P_CH[c];
for(s = 0 ; s < 2 ; s++ )
{
/* wave table */
CH->SLOT[s].wavetable = 0;
CH->SLOT[s].state = EG_OFF;
CH->SLOT[s].volume = MAX_ATT_INDEX;
}
}
}
/* Create one of virtual YM2413 */
/* 'clock' is chip clock in Hz */
/* 'rate' is sampling rate */
static YM2413 *OPLLCreate(int clock, int rate, int type)
{
char *ptr;
YM2413 *chip;
int state_size;
init_tables();
/* calculate chip state size */
state_size = sizeof(YM2413);
/* allocate memory block */
ptr = (char *)malloc(state_size);
if (ptr==NULL)
return NULL;
/* clear */
memset(ptr,0,state_size);
chip = (YM2413 *)ptr;
chip->clock = clock;
chip->rate = rate;
chip->chip_type = type;
chip->mask = 0;
/* init global tables */
OPLL_initalize(chip);
/* reset chip */
OPLLResetChip(chip);
return chip;
}
/* Destroy one of virtual YM3812 */
static void OPLLDestroy(YM2413 *chip)
{
free(chip);
}
/* Option handlers */
static void OPLLSetUpdateHandler(YM2413 *chip,OPLL_UPDATEHANDLER UpdateHandler,void * param)
{
chip->UpdateHandler = UpdateHandler;
chip->UpdateParam = param;
}
/* YM3812 I/O interface */
static void OPLLWrite(YM2413 *chip,int a,int v)
{
if( !(a&1) )
{ /* address port */
chip->address = v & 0xff;
}
else
{ /* data port */
if(chip->UpdateHandler) chip->UpdateHandler(chip->UpdateParam,0);
OPLLWriteReg(chip,chip->address,v);
}
}
static unsigned char OPLLRead(YM2413 *chip,int a)
{
if( !(a&1) )
{
/* status port */
return chip->status;
}
return 0xff;
}
void * ym2413_init(int clock, int rate, int type)
{
/* emulator create */
return OPLLCreate(clock, rate, type);
}
void ym2413_shutdown(void *chip)
{
YM2413 *OPLL = (YM2413 *)chip;
/* emulator shutdown */
OPLLDestroy(OPLL);
}
void ym2413_reset_chip(void *chip)
{
YM2413 *OPLL = (YM2413 *)chip;
OPLLResetChip(OPLL);
}
void ym2413_write(void *chip, int a, int v)
{
YM2413 *OPLL = (YM2413 *)chip;
OPLLWrite(OPLL, a, v);
}
unsigned char ym2413_read(void *chip, int a)
{
YM2413 *OPLL = (YM2413 *)chip;
return OPLLRead(OPLL, a) & 0x03 ;
}
void ym2413_set_update_handler(void *chip,OPLL_UPDATEHANDLER UpdateHandler,void *param)
{
YM2413 *OPLL = (YM2413 *)chip;
OPLLSetUpdateHandler(OPLL, UpdateHandler, param);
}
/*
** Generate samples for one of the YM2413's
**
** 'which' is the virtual YM2413 number
** '*buffer' is the output buffer pointer
** 'length' is the number of samples that should be generated
*/
void ym2413_update_one(void *_chip, SAMP **buffers, int length)
{
YM2413 *chip = (YM2413 *)_chip;
UINT8 rhythm = chip->rhythm&0x20;
SAMP *bufMO = buffers[0];
SAMP *bufRO = buffers[1];
int i,j;
chip->SLOT7_1 = &chip->P_CH[7].SLOT[SLOT1];
chip->SLOT7_2 = &chip->P_CH[7].SLOT[SLOT2];
chip->SLOT8_1 = &chip->P_CH[8].SLOT[SLOT1];
chip->SLOT8_2 = &chip->P_CH[8].SLOT[SLOT2];
for( i=0; i < length ; i++ )
{
int mo,ro;
chip->output[0] = 0;
chip->output[1] = 0;
advance_lfo(chip);
#if 0
/* FM part */
chan_calc(chip,&chip->P_CH[0]);
/* SAVE_SEPARATE_CHANNEL(0); */
chan_calc(chip,&chip->P_CH[1]);
chan_calc(chip,&chip->P_CH[2]);
chan_calc(chip,&chip->P_CH[3]);
chan_calc(chip,&chip->P_CH[4]);
chan_calc(chip,&chip->P_CH[5]);
#else
for ( j=0; j < 6; j++ )
{
if (!(chip->mask & OPLL_MASK_CH(j))) chan_calc(chip, &chip->P_CH[j]);
}
#endif
if(!rhythm)
{
#if 0
chan_calc(chip,&chip->P_CH[6]);
chan_calc(chip,&chip->P_CH[7]);
chan_calc(chip,&chip->P_CH[8]);
#else
for ( j=6; j < 9; j++ )
{
if (!(chip->mask & OPLL_MASK_CH(j))) chan_calc(chip, &chip->P_CH[j]);
}
#endif
}
else /* Rhythm part */
{
if ( ( chip->mask & OPLL_MASK_RHYTHM ) != OPLL_MASK_RHYTHM )
rhythm_calc(chip,&chip->P_CH[0], (chip->noise_rng>>0)&1 );
}
mo = chip->output[0];
ro = chip->output[1];
mo >>= FINAL_SH;
ro >>= FINAL_SH;
/* limit check */
mo = limit( mo , MAXOUT, MINOUT );
ro = limit( ro , MAXOUT, MINOUT );
/* store to sound buffer */
bufMO[i] = mo;
bufRO[i] = ro;
advance(chip);
}
}
void ym2413_advance_lfo(void *_chip)
{
YM2413 *chip = (YM2413 *)_chip;
advance_lfo(chip);
}
void ym2413_advance(void *_chip)
{
YM2413 *chip = (YM2413 *)_chip;
advance(chip);
}
SAMP ym2413_calcch(void *_chip, int ch)
{
YM2413 *chip = (YM2413 *)_chip;
int output;
chip->output[0] = 0;
chip->output[1] = 0;
if (ch >= 0 && ch < 6) chan_calc( chip, &chip->P_CH[ch] );
else if (ch >= 6 && ch < 9)
{
UINT8 rhythm = chip->rhythm&0x20;
if (!rhythm) chan_calc( chip, &chip->P_CH[ch] );
else if (ch == 6) rhythm_calc(chip,&chip->P_CH[0], (chip->noise_rng>>0)&1 );
}
output = chip->output[0];
output += chip->output[1];
return output;
}
void * ym2413_get_inst0(void *_chip)
{
YM2413 *chip = (YM2413 *)_chip;
return &chip->inst_tab;
}
void ym2413_set_mask(void *_chip, UINT32 mask)
{
YM2413 *chip = (YM2413 *)_chip;
chip->mask = mask;
}
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