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scummvm/sound/fmopl.cpp
Jamieson Christian 8b8b964aad Reverted to "old" YM3812 (FMOPL) emulator code. 
Until specific information regarding the benefits
of migrating to the new emulator can be made
available, the "old" code will remain in effect
for the benefit of slower hardware platforms such
as some WinCE-based devices.

svn-id: r8903
2003-07-11 07:14:21 +00:00

1124 lines
30 KiB
C++
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/* ScummVM - Scumm Interpreter
* Copyright (C) 1999-2000 Tatsuyuki Satoh
* Copyright (C) 2001-2003 The ScummVM project
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
* LGPL licensed version of MAMEs fmopl (V0.37a modified) by
* Tatsuyuki Satoh. Included from LGPL'ed AdPlug.
*/
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <math.h>
#include "fmopl.h"
#include "common/engine.h" // for warning/error/debug
#ifndef PI
#define PI 3.14159265358979323846
#endif
/* -------------------- preliminary define section --------------------- */
/* attack/decay rate time rate */
#define OPL_ARRATE 141280 /* RATE 4 = 2826.24ms @ 3.6MHz */
#define OPL_DRRATE 1956000 /* RATE 4 = 39280.64ms @ 3.6MHz */
#define FREQ_BITS 24 /* frequency turn */
/* counter bits = 20 , octerve 7 */
#define FREQ_RATE (1<<(FREQ_BITS-20))
#define TL_BITS (FREQ_BITS+2)
/* final output shift , limit minimum and maximum */
#define OPL_OUTSB (TL_BITS+3-16) /* OPL output final shift 16bit */
#define OPL_MAXOUT (0x7fff<<OPL_OUTSB)
#define OPL_MINOUT (-0x8000<<OPL_OUTSB)
/* -------------------- quality selection --------------------- */
/* sinwave entries */
/* used static memory = SIN_ENT * 4 (byte) */
#define SIN_ENT 2048
/* output level entries (envelope,sinwave) */
/* envelope counter lower bits */
int ENV_BITS;
/* envelope output entries */
int EG_ENT;
/* used dynamic memory = EG_ENT*4*4(byte)or EG_ENT*6*4(byte) */
/* used static memory = EG_ENT*4 (byte) */
int EG_OFF; /* OFF */
int EG_DED;
int EG_DST; /* DECAY START */
int EG_AED;
#define EG_AST 0 /* ATTACK START */
#define EG_STEP (96.0/EG_ENT) /* OPL is 0.1875 dB step */
/* LFO table entries */
#define VIB_ENT 512
#define VIB_SHIFT (32-9)
#define AMS_ENT 512
#define AMS_SHIFT (32-9)
#define VIB_RATE 256
/* -------------------- local defines , macros --------------------- */
/* register number to channel number , slot offset */
#define SLOT1 0
#define SLOT2 1
/* envelope phase */
#define ENV_MOD_RR 0x00
#define ENV_MOD_DR 0x01
#define ENV_MOD_AR 0x02
/* -------------------- tables --------------------- */
static const int slot_array[32]=
{
0, 2, 4, 1, 3, 5,-1,-1,
6, 8,10, 7, 9,11,-1,-1,
12,14,16,13,15,17,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1
};
static uint KSL_TABLE[8 * 16];
static const double KSL_TABLE_SEED[8 * 16] = {
/* OCT 0 */
0.000, 0.000, 0.000, 0.000,
0.000, 0.000, 0.000, 0.000,
0.000, 0.000, 0.000, 0.000,
0.000, 0.000, 0.000, 0.000,
/* OCT 1 */
0.000, 0.000, 0.000, 0.000,
0.000, 0.000, 0.000, 0.000,
0.000, 0.750, 1.125, 1.500,
1.875, 2.250, 2.625, 3.000,
/* OCT 2 */
0.000, 0.000, 0.000, 0.000,
0.000, 1.125, 1.875, 2.625,
3.000, 3.750, 4.125, 4.500,
4.875, 5.250, 5.625, 6.000,
/* OCT 3 */
0.000, 0.000, 0.000, 1.875,
3.000, 4.125, 4.875, 5.625,
6.000, 6.750, 7.125, 7.500,
7.875, 8.250, 8.625, 9.000,
/* OCT 4 */
0.000, 0.000, 3.000, 4.875,
6.000, 7.125, 7.875, 8.625,
9.000, 9.750, 10.125, 10.500,
10.875, 11.250, 11.625, 12.000,
/* OCT 5 */
0.000, 3.000, 6.000, 7.875,
9.000, 10.125, 10.875, 11.625,
12.000, 12.750, 13.125, 13.500,
13.875, 14.250, 14.625, 15.000,
/* OCT 6 */
0.000, 6.000, 9.000, 10.875,
12.000, 13.125, 13.875, 14.625,
15.000, 15.750, 16.125, 16.500,
16.875, 17.250, 17.625, 18.000,
/* OCT 7 */
0.000, 9.000, 12.000, 13.875,
15.000, 16.125, 16.875, 17.625,
18.000, 18.750, 19.125, 19.500,
19.875, 20.250, 20.625, 21.000
};
/* sustain lebel table (3db per step) */
/* 0 - 15: 0, 3, 6, 9,12,15,18,21,24,27,30,33,36,39,42,93 (dB)*/
static int SL_TABLE[16];
static const uint SL_TABLE_SEED[16] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 31
};
#define TL_MAX (EG_ENT * 2) /* limit(tl + ksr + envelope) + sinwave */
/* TotalLevel : 48 24 12 6 3 1.5 0.75 (dB) */
/* TL_TABLE[ 0 to TL_MAX ] : plus section */
/* TL_TABLE[ TL_MAX to TL_MAX+TL_MAX-1 ] : minus section */
static int *TL_TABLE;
/* pointers to TL_TABLE with sinwave output offset */
static int **SIN_TABLE;
/* LFO table */
static int *AMS_TABLE;
static int *VIB_TABLE;
/* envelope output curve table */
/* attack + decay + OFF */
//static int ENV_CURVE[2*EG_ENT+1];
static int ENV_CURVE[2 * 4096 + 1]; // to keep it static ...
/* multiple table */
#define ML(a) (int)(a * 2)
static const uint MUL_TABLE[16]= {
/* 1/2, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15 */
ML(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)
};
#undef ML
/* dummy attack / decay rate ( when rate == 0 ) */
static int RATE_0[16]=
{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
/* -------------------- static state --------------------- */
/* lock level of common table */
static int num_lock = 0;
/* work table */
static void *cur_chip = NULL; /* current chip point */
/* currenct chip state */
/* static OPLSAMPLE *bufL,*bufR; */
static OPL_CH *S_CH;
static OPL_CH *E_CH;
OPL_SLOT *SLOT7_1, *SLOT7_2, *SLOT8_1, *SLOT8_2;
static int outd[1];
static int ams;
static int vib;
int *ams_table;
int *vib_table;
static int amsIncr;
static int vibIncr;
static int feedback2; /* connect for SLOT 2 */
/* --------------------- rebuild tables ------------------- */
#define SC_KSL(mydb) ((uint) (mydb / (EG_STEP / 2)))
#define SC_SL(db) (int)(db * ((3 / EG_STEP) * (1 << ENV_BITS))) + EG_DST
void OPLBuildTables(int ENV_BITS_PARAM, int EG_ENT_PARAM) {
int i;
ENV_BITS = ENV_BITS_PARAM;
EG_ENT = EG_ENT_PARAM;
EG_OFF = ((2 * EG_ENT)<<ENV_BITS); /* OFF */
EG_DED = EG_OFF;
EG_DST = (EG_ENT << ENV_BITS); /* DECAY START */
EG_AED = EG_DST;
//EG_STEP = (96.0/EG_ENT);
for (i = 0; i < (int)(sizeof(KSL_TABLE_SEED) / sizeof(double)); i++)
KSL_TABLE[i] = SC_KSL(KSL_TABLE_SEED[i]);
for (i = 0; i < (int)(sizeof(SL_TABLE_SEED) / sizeof(uint)); i++)
SL_TABLE[i] = SC_SL(SL_TABLE_SEED[i]);
}
#undef SC_KSL
#undef SC_SL
/* --------------------- subroutines --------------------- */
inline int Limit(int val, int max, int min) {
if ( val > max )
val = max;
else if ( val < min )
val = min;
return val;
}
/* status set and IRQ handling */
inline void OPL_STATUS_SET(FM_OPL *OPL, int flag) {
/* set status flag */
OPL->status |= flag;
if(!(OPL->status & 0x80)) {
if(OPL->status & OPL->statusmask) { /* IRQ on */
OPL->status |= 0x80;
/* callback user interrupt handler (IRQ is OFF to ON) */
if(OPL->IRQHandler)
(OPL->IRQHandler)(OPL->IRQParam,1);
}
}
}
/* status reset and IRQ handling */
inline void OPL_STATUS_RESET(FM_OPL *OPL, int flag) {
/* reset status flag */
OPL->status &= ~flag;
if((OPL->status & 0x80)) {
if (!(OPL->status & OPL->statusmask)) {
OPL->status &= 0x7f;
/* callback user interrupt handler (IRQ is ON to OFF) */
if(OPL->IRQHandler) (OPL->IRQHandler)(OPL->IRQParam,0);
}
}
}
/* IRQ mask set */
inline void OPL_STATUSMASK_SET(FM_OPL *OPL, int flag) {
OPL->statusmask = flag;
/* IRQ handling check */
OPL_STATUS_SET(OPL,0);
OPL_STATUS_RESET(OPL,0);
}
/* ----- key on ----- */
inline void OPL_KEYON(OPL_SLOT *SLOT) {
/* sin wave restart */
SLOT->Cnt = 0;
/* set attack */
SLOT->evm = ENV_MOD_AR;
SLOT->evs = SLOT->evsa;
SLOT->evc = EG_AST;
SLOT->eve = EG_AED;
}
/* ----- key off ----- */
inline void OPL_KEYOFF(OPL_SLOT *SLOT) {
if( SLOT->evm > ENV_MOD_RR) {
/* set envelope counter from envleope output */
SLOT->evm = ENV_MOD_RR;
if( !(SLOT->evc & EG_DST) )
//SLOT->evc = (ENV_CURVE[SLOT->evc>>ENV_BITS]<<ENV_BITS) + EG_DST;
SLOT->evc = EG_DST;
SLOT->eve = EG_DED;
SLOT->evs = SLOT->evsr;
}
}
/* ---------- calcrate Envelope Generator & Phase Generator ---------- */
/* return : envelope output */
inline uint OPL_CALC_SLOT(OPL_SLOT *SLOT) {
/* calcrate envelope generator */
if((SLOT->evc += SLOT->evs) >= SLOT->eve) {
switch( SLOT->evm ){
case ENV_MOD_AR: /* ATTACK -> DECAY1 */
/* next DR */
SLOT->evm = ENV_MOD_DR;
SLOT->evc = EG_DST;
SLOT->eve = SLOT->SL;
SLOT->evs = SLOT->evsd;
break;
case ENV_MOD_DR: /* DECAY -> SL or RR */
SLOT->evc = SLOT->SL;
SLOT->eve = EG_DED;
if(SLOT->eg_typ) {
SLOT->evs = 0;
} else {
SLOT->evm = ENV_MOD_RR;
SLOT->evs = SLOT->evsr;
}
break;
case ENV_MOD_RR: /* RR -> OFF */
SLOT->evc = EG_OFF;
SLOT->eve = EG_OFF + 1;
SLOT->evs = 0;
break;
}
}
/* calcrate envelope */
return SLOT->TLL + ENV_CURVE[SLOT->evc>>ENV_BITS] + (SLOT->ams ? ams : 0);
}
/* set algorythm connection */
static void set_algorythm(OPL_CH *CH) {
int *carrier = &outd[0];
CH->connect1 = CH->CON ? carrier : &feedback2;
CH->connect2 = carrier;
}
/* ---------- frequency counter for operater update ---------- */
inline void CALC_FCSLOT(OPL_CH *CH, OPL_SLOT *SLOT) {
int ksr;
/* frequency step counter */
SLOT->Incr = CH->fc * SLOT->mul;
ksr = CH->kcode >> SLOT->KSR;
if( SLOT->ksr != ksr )
{
SLOT->ksr = ksr;
/* attack , decay rate recalcration */
SLOT->evsa = SLOT->AR[ksr];
SLOT->evsd = SLOT->DR[ksr];
SLOT->evsr = SLOT->RR[ksr];
}
SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
}
/* set multi,am,vib,EG-TYP,KSR,mul */
inline void set_mul(FM_OPL *OPL, int slot, int v) {
OPL_CH *CH = &OPL->P_CH[slot / 2];
OPL_SLOT *SLOT = &CH->SLOT[slot & 1];
SLOT->mul = MUL_TABLE[v & 0x0f];
SLOT->KSR = (v & 0x10) ? 0 : 2;
SLOT->eg_typ = (v & 0x20) >> 5;
SLOT->vib = (v & 0x40);
SLOT->ams = (v & 0x80);
CALC_FCSLOT(CH, SLOT);
}
/* set ksl & tl */
inline void set_ksl_tl(FM_OPL *OPL, int slot, int v) {
OPL_CH *CH = &OPL->P_CH[slot / 2];
OPL_SLOT *SLOT = &CH->SLOT[slot & 1];
int ksl = v >> 6; /* 0 / 1.5 / 3 / 6 db/OCT */
SLOT->ksl = ksl ? 3-ksl : 31;
SLOT->TL = (int)((v & 0x3f) * (0.75 / EG_STEP)); /* 0.75db step */
if(!(OPL->mode & 0x80)) { /* not CSM latch total level */
SLOT->TLL = SLOT->TL + (CH->ksl_base >> SLOT->ksl);
}
}
/* set attack rate & decay rate */
inline void set_ar_dr(FM_OPL *OPL, int slot, int v) {
OPL_CH *CH = &OPL->P_CH[slot / 2];
OPL_SLOT *SLOT = &CH->SLOT[slot & 1];
int ar = v >> 4;
int dr = v & 0x0f;
SLOT->AR = ar ? &OPL->AR_TABLE[ar << 2] : RATE_0;
SLOT->evsa = SLOT->AR[SLOT->ksr];
if(SLOT->evm == ENV_MOD_AR)
SLOT->evs = SLOT->evsa;
SLOT->DR = dr ? &OPL->DR_TABLE[dr<<2] : RATE_0;
SLOT->evsd = SLOT->DR[SLOT->ksr];
if(SLOT->evm == ENV_MOD_DR)
SLOT->evs = SLOT->evsd;
}
/* set sustain level & release rate */
inline void set_sl_rr(FM_OPL *OPL, int slot, int v) {
OPL_CH *CH = &OPL->P_CH[slot / 2];
OPL_SLOT *SLOT = &CH->SLOT[slot & 1];
int sl = v >> 4;
int rr = v & 0x0f;
SLOT->SL = SL_TABLE[sl];
if(SLOT->evm == ENV_MOD_DR)
SLOT->eve = SLOT->SL;
SLOT->RR = &OPL->DR_TABLE[rr<<2];
SLOT->evsr = SLOT->RR[SLOT->ksr];
if(SLOT->evm == ENV_MOD_RR)
SLOT->evs = SLOT->evsr;
}
/* operator output calcrator */
#define OP_OUT(slot,env,con) slot->wavetable[((slot->Cnt + con) / (0x1000000 / SIN_ENT)) & (SIN_ENT-1)][env]
/* ---------- calcrate one of channel ---------- */
inline void OPL_CALC_CH(OPL_CH *CH) {
uint env_out;
OPL_SLOT *SLOT;
feedback2 = 0;
/* SLOT 1 */
SLOT = &CH->SLOT[SLOT1];
env_out=OPL_CALC_SLOT(SLOT);
if(env_out < (uint)(EG_ENT - 1)) {
/* PG */
if(SLOT->vib)
SLOT->Cnt += (SLOT->Incr * vib / VIB_RATE);
else
SLOT->Cnt += SLOT->Incr;
/* connectoion */
if(CH->FB) {
int feedback1 = (CH->op1_out[0] + CH->op1_out[1]) >> CH->FB;
CH->op1_out[1] = CH->op1_out[0];
*CH->connect1 += CH->op1_out[0] = OP_OUT(SLOT, env_out, feedback1);
}
else {
*CH->connect1 += OP_OUT(SLOT, env_out, 0);
}
}else {
CH->op1_out[1] = CH->op1_out[0];
CH->op1_out[0] = 0;
}
/* SLOT 2 */
SLOT = &CH->SLOT[SLOT2];
env_out=OPL_CALC_SLOT(SLOT);
if(env_out < (uint)(EG_ENT - 1)) {
/* PG */
if(SLOT->vib)
SLOT->Cnt += (SLOT->Incr * vib / VIB_RATE);
else
SLOT->Cnt += SLOT->Incr;
/* connectoion */
outd[0] += OP_OUT(SLOT, env_out, feedback2);
}
}
/* ---------- calcrate rythm block ---------- */
#define WHITE_NOISE_db 6.0
inline void OPL_CALC_RH(OPL_CH *CH) {
uint env_tam, env_sd, env_top, env_hh;
int whitenoise = int((rand()&1) * (WHITE_NOISE_db / EG_STEP));
int tone8;
OPL_SLOT *SLOT;
int env_out;
/* BD : same as FM serial mode and output level is large */
feedback2 = 0;
/* SLOT 1 */
SLOT = &CH[6].SLOT[SLOT1];
env_out = OPL_CALC_SLOT(SLOT);
if(env_out < EG_ENT-1) {
/* PG */
if(SLOT->vib)
SLOT->Cnt += (SLOT->Incr * vib / VIB_RATE);
else
SLOT->Cnt += SLOT->Incr;
/* connectoion */
if(CH[6].FB) {
int feedback1 = (CH[6].op1_out[0] + CH[6].op1_out[1]) >> CH[6].FB;
CH[6].op1_out[1] = CH[6].op1_out[0];
feedback2 = CH[6].op1_out[0] = OP_OUT(SLOT, env_out, feedback1);
}
else {
feedback2 = OP_OUT(SLOT, env_out, 0);
}
}else {
feedback2 = 0;
CH[6].op1_out[1] = CH[6].op1_out[0];
CH[6].op1_out[0] = 0;
}
/* SLOT 2 */
SLOT = &CH[6].SLOT[SLOT2];
env_out = OPL_CALC_SLOT(SLOT);
if(env_out < EG_ENT-1) {
/* PG */
if(SLOT->vib)
SLOT->Cnt += (SLOT->Incr * vib / VIB_RATE);
else
SLOT->Cnt += SLOT->Incr;
/* connectoion */
outd[0] += OP_OUT(SLOT, env_out, feedback2) * 2;
}
// SD (17) = mul14[fnum7] + white noise
// TAM (15) = mul15[fnum8]
// TOP (18) = fnum6(mul18[fnum8]+whitenoise)
// HH (14) = fnum7(mul18[fnum8]+whitenoise) + white noise
env_sd = OPL_CALC_SLOT(SLOT7_2) + whitenoise;
env_tam =OPL_CALC_SLOT(SLOT8_1);
env_top = OPL_CALC_SLOT(SLOT8_2);
env_hh = OPL_CALC_SLOT(SLOT7_1) + whitenoise;
/* PG */
if(SLOT7_1->vib)
SLOT7_1->Cnt += (2 * SLOT7_1->Incr * vib / VIB_RATE);
else
SLOT7_1->Cnt += 2 * SLOT7_1->Incr;
if(SLOT7_2->vib)
SLOT7_2->Cnt += ((CH[7].fc * 8) * vib / VIB_RATE);
else
SLOT7_2->Cnt += (CH[7].fc * 8);
if(SLOT8_1->vib)
SLOT8_1->Cnt += (SLOT8_1->Incr * vib / VIB_RATE);
else
SLOT8_1->Cnt += SLOT8_1->Incr;
if(SLOT8_2->vib)
SLOT8_2->Cnt += ((CH[8].fc * 48) * vib / VIB_RATE);
else
SLOT8_2->Cnt += (CH[8].fc * 48);
tone8 = OP_OUT(SLOT8_2,whitenoise,0 );
/* SD */
if(env_sd < (uint)(EG_ENT - 1))
outd[0] += OP_OUT(SLOT7_1, env_sd, 0) * 8;
/* TAM */
if(env_tam < (uint)(EG_ENT - 1))
outd[0] += OP_OUT(SLOT8_1, env_tam, 0) * 2;
/* TOP-CY */
if(env_top < (uint)(EG_ENT - 1))
outd[0] += OP_OUT(SLOT7_2, env_top, tone8) * 2;
/* HH */
if(env_hh < (uint)(EG_ENT-1))
outd[0] += OP_OUT(SLOT7_2, env_hh, tone8) * 2;
}
/* ----------- initialize time tabls ----------- */
static void init_timetables(FM_OPL *OPL, int ARRATE, int DRRATE) {
int i;
double rate;
/* make attack rate & decay rate tables */
for (i = 0; i < 4; i++)
OPL->AR_TABLE[i] = OPL->DR_TABLE[i] = 0;
for (i = 4; i <= 60; i++){
rate = OPL->freqbase; /* frequency rate */
if(i < 60)
rate *= 1.0 + (i & 3) * 0.25; /* b0-1 : x1 , x1.25 , x1.5 , x1.75 */
rate *= 1 << ((i >> 2) - 1); /* b2-5 : shift bit */
rate *= (double)(EG_ENT << ENV_BITS);
OPL->AR_TABLE[i] = (int)(rate / ARRATE);
OPL->DR_TABLE[i] = (int)(rate / DRRATE);
}
for (i = 60; i < 75; i++) {
OPL->AR_TABLE[i] = EG_AED-1;
OPL->DR_TABLE[i] = OPL->DR_TABLE[60];
}
}
/* ---------- generic table initialize ---------- */
static int OPLOpenTable(void) {
int s,t;
double rate;
int i,j;
double pom;
/* allocate dynamic tables */
if((TL_TABLE = (int *)malloc(TL_MAX * 2 * sizeof(int))) == NULL)
return 0;
if((SIN_TABLE = (int **)malloc(SIN_ENT * 4 * sizeof(int *))) == NULL) {
free(TL_TABLE);
return 0;
}
if((AMS_TABLE = (int *)malloc(AMS_ENT * 2 * sizeof(int))) == NULL) {
free(TL_TABLE);
free(SIN_TABLE);
return 0;
}
if((VIB_TABLE = (int *)malloc(VIB_ENT * 2 * sizeof(int))) == NULL) {
free(TL_TABLE);
free(SIN_TABLE);
free(AMS_TABLE);
return 0;
}
/* make total level table */
for (t = 0; t < EG_ENT - 1 ; t++){
rate = ((1 << TL_BITS) - 1) / pow(10, EG_STEP * t / 20); /* dB -> voltage */
TL_TABLE[ t] = (int)rate;
TL_TABLE[TL_MAX + t] = -TL_TABLE[t];
}
/* fill volume off area */
for (t = EG_ENT - 1; t < TL_MAX; t++){
TL_TABLE[t] = TL_TABLE[TL_MAX + t] = 0;
}
/* make sinwave table (total level offet) */
/* degree 0 = degree 180 = off */
SIN_TABLE[0] = SIN_TABLE[SIN_ENT /2 ] = &TL_TABLE[EG_ENT - 1];
for (s = 1;s <= SIN_ENT / 4; s++){
pom = sin(2 * PI * s / SIN_ENT); /* sin */
pom = 20 * log10(1 / pom); /* decibel */
j = int(pom / EG_STEP); /* TL_TABLE steps */
/* degree 0 - 90 , degree 180 - 90 : plus section */
SIN_TABLE[ s] = SIN_TABLE[SIN_ENT / 2 - s] = &TL_TABLE[j];
/* degree 180 - 270 , degree 360 - 270 : minus section */
SIN_TABLE[SIN_ENT / 2 + s] = SIN_TABLE[SIN_ENT - s] = &TL_TABLE[TL_MAX + j];
}
for (s = 0;s < SIN_ENT; s++) {
SIN_TABLE[SIN_ENT * 1 + s] = s < (SIN_ENT / 2) ? SIN_TABLE[s] : &TL_TABLE[EG_ENT];
SIN_TABLE[SIN_ENT * 2 + s] = SIN_TABLE[s % (SIN_ENT / 2)];
SIN_TABLE[SIN_ENT * 3 + s] = (s / (SIN_ENT / 4)) & 1 ? &TL_TABLE[EG_ENT] : SIN_TABLE[SIN_ENT * 2 + s];
}
/* envelope counter -> envelope output table */
for (i=0; i < EG_ENT; i++) {
/* ATTACK curve */
pom = pow(((double)(EG_ENT - 1 - i) / EG_ENT), 8) * EG_ENT;
/* if( pom >= EG_ENT ) pom = EG_ENT-1; */
ENV_CURVE[i] = (int)pom;
/* DECAY ,RELEASE curve */
ENV_CURVE[(EG_DST >> ENV_BITS) + i]= i;
}
/* off */
ENV_CURVE[EG_OFF >> ENV_BITS]= EG_ENT - 1;
/* make LFO ams table */
for (i=0; i < AMS_ENT; i++) {
pom = (1.0 + sin(2 * PI * i / AMS_ENT)) / 2; /* sin */
AMS_TABLE[i] = (int)((1.0 / EG_STEP) * pom); /* 1dB */
AMS_TABLE[AMS_ENT + i] = (int)((4.8 / EG_STEP) * pom); /* 4.8dB */
}
/* make LFO vibrate table */
for (i=0; i < VIB_ENT; i++) {
/* 100cent = 1seminote = 6% ?? */
pom = (double)VIB_RATE * 0.06 * sin(2 * PI * i / VIB_ENT); /* +-100sect step */
VIB_TABLE[i] = (int)(VIB_RATE + (pom * 0.07)); /* +- 7cent */
VIB_TABLE[VIB_ENT + i] = (int)(VIB_RATE + (pom * 0.14)); /* +-14cent */
}
return 1;
}
static void OPLCloseTable(void) {
free(TL_TABLE);
free(SIN_TABLE);
free(AMS_TABLE);
free(VIB_TABLE);
}
/* CSM Key Controll */
inline void CSMKeyControll(OPL_CH *CH) {
OPL_SLOT *slot1 = &CH->SLOT[SLOT1];
OPL_SLOT *slot2 = &CH->SLOT[SLOT2];
/* all key off */
OPL_KEYOFF(slot1);
OPL_KEYOFF(slot2);
/* total level latch */
slot1->TLL = slot1->TL + (CH->ksl_base>>slot1->ksl);
slot1->TLL = slot1->TL + (CH->ksl_base>>slot1->ksl);
/* key on */
CH->op1_out[0] = CH->op1_out[1] = 0;
OPL_KEYON(slot1);
OPL_KEYON(slot2);
}
/* ---------- opl initialize ---------- */
static void OPL_initalize(FM_OPL *OPL) {
int fn;
/* frequency base */
OPL->freqbase = (OPL->rate) ? ((double)OPL->clock / OPL->rate) / 72 : 0;
/* Timer base time */
OPL->TimerBase = 1.0/((double)OPL->clock / 72.0 );
/* make time tables */
init_timetables(OPL, OPL_ARRATE, OPL_DRRATE);
/* make fnumber -> increment counter table */
for( fn=0; fn < 1024; fn++) {
OPL->FN_TABLE[fn] = (uint)(OPL->freqbase * fn * FREQ_RATE * (1<<7) / 2);
}
/* LFO freq.table */
OPL->amsIncr = (int)(OPL->rate ? (double)AMS_ENT * (1 << AMS_SHIFT) / OPL->rate * 3.7 * ((double)OPL->clock/3600000) : 0);
OPL->vibIncr = (int)(OPL->rate ? (double)VIB_ENT * (1 << VIB_SHIFT) / OPL->rate * 6.4 * ((double)OPL->clock/3600000) : 0);
}
/* ---------- write a OPL registers ---------- */
void OPLWriteReg(FM_OPL *OPL, int r, int v) {
OPL_CH *CH;
int slot;
uint block_fnum;
switch(r & 0xe0) {
case 0x00: /* 00-1f:controll */
switch(r & 0x1f) {
case 0x01:
/* wave selector enable */
if(OPL->type&OPL_TYPE_WAVESEL) {
OPL->wavesel = v & 0x20;
if(!OPL->wavesel) {
/* preset compatible mode */
int c;
for(c=0; c<OPL->max_ch; c++) {
OPL->P_CH[c].SLOT[SLOT1].wavetable = &SIN_TABLE[0];
OPL->P_CH[c].SLOT[SLOT2].wavetable = &SIN_TABLE[0];
}
}
}
return;
case 0x02: /* Timer 1 */
OPL->T[0] = (256-v) * 4;
break;
case 0x03: /* Timer 2 */
OPL->T[1] = (256-v) * 16;
return;
case 0x04: /* IRQ clear / mask and Timer enable */
if(v & 0x80) { /* IRQ flag clear */
OPL_STATUS_RESET(OPL, 0x7f);
}
else { /* set IRQ mask ,timer enable*/
uint8 st1 = v & 1;
uint8 st2 = (v >> 1) & 1;
/* IRQRST,T1MSK,t2MSK,EOSMSK,BRMSK,x,ST2,ST1 */
OPL_STATUS_RESET(OPL, v & 0x78);
OPL_STATUSMASK_SET(OPL,((~v) & 0x78) | 0x01);
/* timer 2 */
if(OPL->st[1] != st2) {
double interval = st2 ? (double)OPL->T[1] * OPL->TimerBase : 0.0;
OPL->st[1] = st2;
if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam + 1, interval);
}
/* timer 1 */
if(OPL->st[0] != st1) {
double interval = st1 ? (double)OPL->T[0] * OPL->TimerBase : 0.0;
OPL->st[0] = st1;
if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam + 0, interval);
}
}
return;
}
break;
case 0x20: /* am,vib,ksr,eg type,mul */
slot = slot_array[r&0x1f];
if(slot == -1)
return;
set_mul(OPL,slot,v);
return;
case 0x40:
slot = slot_array[r&0x1f];
if(slot == -1)
return;
set_ksl_tl(OPL,slot,v);
return;
case 0x60:
slot = slot_array[r&0x1f];
if(slot == -1)
return;
set_ar_dr(OPL,slot,v);
return;
case 0x80:
slot = slot_array[r&0x1f];
if(slot == -1)
return;
set_sl_rr(OPL,slot,v);
return;
case 0xa0:
switch(r) {
case 0xbd:
/* amsep,vibdep,r,bd,sd,tom,tc,hh */
{
uint8 rkey = OPL->rythm ^ v;
OPL->ams_table = &AMS_TABLE[v & 0x80 ? AMS_ENT : 0];
OPL->vib_table = &VIB_TABLE[v & 0x40 ? VIB_ENT : 0];
OPL->rythm = v & 0x3f;
if(OPL->rythm & 0x20) {
/* BD key on/off */
if(rkey & 0x10) {
if(v & 0x10) {
OPL->P_CH[6].op1_out[0] = OPL->P_CH[6].op1_out[1] = 0;
OPL_KEYON(&OPL->P_CH[6].SLOT[SLOT1]);
OPL_KEYON(&OPL->P_CH[6].SLOT[SLOT2]);
}
else {
OPL_KEYOFF(&OPL->P_CH[6].SLOT[SLOT1]);
OPL_KEYOFF(&OPL->P_CH[6].SLOT[SLOT2]);
}
}
/* SD key on/off */
if(rkey & 0x08) {
if(v & 0x08)
OPL_KEYON(&OPL->P_CH[7].SLOT[SLOT2]);
else
OPL_KEYOFF(&OPL->P_CH[7].SLOT[SLOT2]);
}/* TAM key on/off */
if(rkey & 0x04) {
if(v & 0x04)
OPL_KEYON(&OPL->P_CH[8].SLOT[SLOT1]);
else
OPL_KEYOFF(&OPL->P_CH[8].SLOT[SLOT1]);
}
/* TOP-CY key on/off */
if(rkey & 0x02) {
if(v & 0x02)
OPL_KEYON(&OPL->P_CH[8].SLOT[SLOT2]);
else
OPL_KEYOFF(&OPL->P_CH[8].SLOT[SLOT2]);
}
/* HH key on/off */
if(rkey & 0x01) {
if(v & 0x01)
OPL_KEYON(&OPL->P_CH[7].SLOT[SLOT1]);
else
OPL_KEYOFF(&OPL->P_CH[7].SLOT[SLOT1]);
}
}
}
return;
}
/* keyon,block,fnum */
if((r & 0x0f) > 8)
return;
CH = &OPL->P_CH[r & 0x0f];
if(!(r&0x10)) { /* a0-a8 */
block_fnum = (CH->block_fnum & 0x1f00) | v;
}
else { /* b0-b8 */
int keyon = (v >> 5) & 1;
block_fnum = ((v & 0x1f) << 8) | (CH->block_fnum & 0xff);
if(CH->keyon != keyon) {
if((CH->keyon=keyon)) {
CH->op1_out[0] = CH->op1_out[1] = 0;
OPL_KEYON(&CH->SLOT[SLOT1]);
OPL_KEYON(&CH->SLOT[SLOT2]);
}
else {
OPL_KEYOFF(&CH->SLOT[SLOT1]);
OPL_KEYOFF(&CH->SLOT[SLOT2]);
}
}
}
/* update */
if(CH->block_fnum != block_fnum) {
int blockRv = 7 - (block_fnum >> 10);
int fnum = block_fnum & 0x3ff;
CH->block_fnum = block_fnum;
CH->ksl_base = KSL_TABLE[block_fnum >> 6];
CH->fc = OPL->FN_TABLE[fnum] >> blockRv;
CH->kcode = CH->block_fnum >> 9;
if((OPL->mode & 0x40) && CH->block_fnum & 0x100)
CH->kcode |=1;
CALC_FCSLOT(CH,&CH->SLOT[SLOT1]);
CALC_FCSLOT(CH,&CH->SLOT[SLOT2]);
}
return;
case 0xc0:
/* FB,C */
if((r & 0x0f) > 8)
return;
CH = &OPL->P_CH[r&0x0f];
{
int feedback = (v >> 1) & 7;
CH->FB = feedback ? (8 + 1) - feedback : 0;
CH->CON = v & 1;
set_algorythm(CH);
}
return;
case 0xe0: /* wave type */
slot = slot_array[r & 0x1f];
if(slot == -1)
return;
CH = &OPL->P_CH[slot / 2];
if(OPL->wavesel) {
CH->SLOT[slot&1].wavetable = &SIN_TABLE[(v & 0x03) * SIN_ENT];
}
return;
}
}
/* lock/unlock for common table */
static int OPL_LockTable(void)
{
num_lock++;
if(num_lock>1)
return 0;
/* first time */
cur_chip = NULL;
/* allocate total level table (128kb space) */
if(!OPLOpenTable()) {
num_lock--;
return -1;
}
return 0;
}
static void OPL_UnLockTable(void) {
if(num_lock)
num_lock--;
if(num_lock)
return;
/* last time */
cur_chip = NULL;
OPLCloseTable();
}
/*******************************************************************************/
/* YM3812 local section */
/*******************************************************************************/
/* ---------- update one of chip ----------- */
void YM3812UpdateOne(FM_OPL *OPL, int16 *buffer, int length) {
int i;
int data;
int16 *buf = buffer;
uint amsCnt = OPL->amsCnt;
uint vibCnt = OPL->vibCnt;
uint8 rythm = OPL->rythm & 0x20;
OPL_CH *CH, *R_CH;
if((void *)OPL != cur_chip){
cur_chip = (void *)OPL;
/* channel pointers */
S_CH = OPL->P_CH;
E_CH = &S_CH[9];
/* rythm slot */
SLOT7_1 = &S_CH[7].SLOT[SLOT1];
SLOT7_2 = &S_CH[7].SLOT[SLOT2];
SLOT8_1 = &S_CH[8].SLOT[SLOT1];
SLOT8_2 = &S_CH[8].SLOT[SLOT2];
/* LFO state */
amsIncr = OPL->amsIncr;
vibIncr = OPL->vibIncr;
ams_table = OPL->ams_table;
vib_table = OPL->vib_table;
}
R_CH = rythm ? &S_CH[6] : E_CH;
for(i = 0; i < length; i++) {
/* channel A channel B channel C */
/* LFO */
ams = ams_table[(amsCnt += amsIncr) >> AMS_SHIFT];
vib = vib_table[(vibCnt += vibIncr) >> VIB_SHIFT];
outd[0] = 0;
/* FM part */
for(CH=S_CH; CH < R_CH; CH++)
OPL_CALC_CH(CH);
/* Rythn part */
if(rythm)
OPL_CALC_RH(S_CH);
/* limit check */
data = Limit(outd[0], OPL_MAXOUT, OPL_MINOUT);
/* store to sound buffer */
buf[i] = data >> OPL_OUTSB;
}
OPL->amsCnt = amsCnt;
OPL->vibCnt = vibCnt;
}
/* ---------- reset a chip ---------- */
void OPLResetChip(FM_OPL *OPL) {
int c,s;
int i;
/* reset chip */
OPL->mode = 0; /* normal mode */
OPL_STATUS_RESET(OPL, 0x7f);
/* reset with register write */
OPLWriteReg(OPL, 0x01,0); /* wabesel disable */
OPLWriteReg(OPL, 0x02,0); /* Timer1 */
OPLWriteReg(OPL, 0x03,0); /* Timer2 */
OPLWriteReg(OPL, 0x04,0); /* IRQ mask clear */
for(i = 0xff; i >= 0x20; i--)
OPLWriteReg(OPL,i,0);
/* reset OPerator paramater */
for(c = 0; c < OPL->max_ch ;c++ ) {
OPL_CH *CH = &OPL->P_CH[c];
/* OPL->P_CH[c].PAN = OPN_CENTER; */
for(s = 0; s < 2; s++ ) {
/* wave table */
CH->SLOT[s].wavetable = &SIN_TABLE[0];
/* CH->SLOT[s].evm = ENV_MOD_RR; */
CH->SLOT[s].evc = EG_OFF;
CH->SLOT[s].eve = EG_OFF + 1;
CH->SLOT[s].evs = 0;
}
}
}
/* ---------- Create a virtual YM3812 ---------- */
/* 'rate' is sampling rate and 'bufsiz' is the size of the */
FM_OPL *OPLCreate(int type, int clock, int rate) {
char *ptr;
FM_OPL *OPL;
int state_size;
int max_ch = 9; /* normaly 9 channels */
if( OPL_LockTable() == -1)
return NULL;
/* allocate OPL state space */
state_size = sizeof(FM_OPL);
state_size += sizeof(OPL_CH) * max_ch;
/* allocate memory block */
ptr = (char *)calloc(state_size, 1);
if(ptr == NULL)
return NULL;
/* clear */
memset(ptr, 0, state_size);
OPL = (FM_OPL *)ptr; ptr += sizeof(FM_OPL);
OPL->P_CH = (OPL_CH *)ptr; ptr += sizeof(OPL_CH) * max_ch;
/* set channel state pointer */
OPL->type = type;
OPL->clock = clock;
OPL->rate = rate;
OPL->max_ch = max_ch;
/* init grobal tables */
OPL_initalize(OPL);
/* reset chip */
OPLResetChip(OPL);
return OPL;
}
/* ---------- Destroy one of vietual YM3812 ---------- */
void OPLDestroy(FM_OPL *OPL) {
OPL_UnLockTable();
free(OPL);
}
/* ---------- Option handlers ---------- */
void OPLSetTimerHandler(FM_OPL *OPL, OPL_TIMERHANDLER TimerHandler,int channelOffset) {
OPL->TimerHandler = TimerHandler;
OPL->TimerParam = channelOffset;
}
void OPLSetIRQHandler(FM_OPL *OPL, OPL_IRQHANDLER IRQHandler, int param) {
OPL->IRQHandler = IRQHandler;
OPL->IRQParam = param;
}
void OPLSetUpdateHandler(FM_OPL *OPL, OPL_UPDATEHANDLER UpdateHandler,int param) {
OPL->UpdateHandler = UpdateHandler;
OPL->UpdateParam = param;
}
/* ---------- YM3812 I/O interface ---------- */
int OPLWrite(FM_OPL *OPL,int a,int v) {
if(!(a & 1)) { /* address port */
OPL->address = v & 0xff;
}
else { /* data port */
if(OPL->UpdateHandler)
OPL->UpdateHandler(OPL->UpdateParam,0);
OPLWriteReg(OPL, OPL->address,v);
}
return OPL->status >> 7;
}
unsigned char OPLRead(FM_OPL *OPL,int a) {
if(!(a & 1)) { /* status port */
return OPL->status & (OPL->statusmask | 0x80);
}
/* data port */
switch(OPL->address) {
case 0x05: /* KeyBoard IN */
warning("OPL:read unmapped KEYBOARD port\n");
return 0;
case 0x19: /* I/O DATA */
warning("OPL:read unmapped I/O port\n");
return 0;
case 0x1a: /* PCM-DATA */
return 0;
}
return 0;
}
int OPLTimerOver(FM_OPL *OPL, int c) {
if(c) { /* Timer B */
OPL_STATUS_SET(OPL, 0x20);
}
else { /* Timer A */
OPL_STATUS_SET(OPL, 0x40);
/* CSM mode key,TL controll */
if(OPL->mode & 0x80) { /* CSM mode total level latch and auto key on */
int ch;
if(OPL->UpdateHandler)
OPL->UpdateHandler(OPL->UpdateParam,0);
for(ch = 0; ch < 9; ch++)
CSMKeyControll(&OPL->P_CH[ch]);
}
}
/* reload timer */
if (OPL->TimerHandler)
(OPL->TimerHandler)(OPL->TimerParam + c, (double)OPL->T[c] * OPL->TimerBase);
return OPL->status >> 7;
}
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