+++ /dev/null
-/* FCE Ultra - NES/Famicom Emulator
- *
- * Copyright notice for this file:
- * Copyright (C) 1999,2000 Tatsuyuki Satoh
- * Copyright (C) 2001,2002 Ben Parnell
- *
- * 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
- */
-
-/* This file has been heavily modified from the original(mostly unused
- code was removed). If you want to use it for anything other than
- VRC7 sound emulation, you should get the original from the AdPlug
- source distribution or the MAME(version 0.37b16) source distribution
- (but be careful about the different licenses).
- - Xodnizel
-*/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdarg.h>
-#include <math.h>
-#include "mapinc.h"
-#include "fmopl.h"
-
-#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 DELTAT_MIXING_LEVEL (1) /* DELTA-T ADPCM MIXING LEVEL */
-
-#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<<3)
-#define OPL_MINOUT (-0x8000<<OPL_OUTSB<<3)
-
-/* -------------------- quality selection --------------------- */
-
-/* sinwave entries */
-/* used static memory = SIN_ENT * 4 (byte) */
-#define SIN_ENT 2048
-
-/* output level entries (envelope,sinwave) */
-/* envelope counter lower bits */
-#define ENV_BITS 16
-/* envelope output entries */
-#define EG_ENT 4096
-/* used dynamic memory = EG_ENT*4*4(byte)or EG_ENT*6*4(byte) */
-/* used static memory = EG_ENT*4 (byte) */
-
-#define EG_OFF ((2*EG_ENT)<<ENV_BITS) /* OFF */
-#define EG_DED EG_OFF
-#define EG_DST (EG_ENT<<ENV_BITS) /* DECAY START */
-#define EG_AED EG_DST
-#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
-};
-
-/* key scale level */
-/* table is 3dB/OCT , DV converts this in TL step at 6dB/OCT */
-#define DV (EG_STEP/2)
-static const UINT32 KSL_TABLE[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 lebel table (3db per step) */
-/* 0 - 15: 0, 3, 6, 9,12,15,18,21,24,27,30,33,36,39,42,93 (dB)*/
-#define SC(db) (db*((3/EG_STEP)*(1<<ENV_BITS)))+EG_DST
-static const INT32 SL_TABLE[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(31)
-};
-#undef SC
-
-#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 INT32 *TL_TABLE;
-
-/* pointers to TL_TABLE with sinwave output offset */
-static INT32 **SIN_TABLE;
-
-/* LFO table */
-static INT32 *AMS_TABLE;
-static INT32 *VIB_TABLE;
-
-/* envelope output curve table */
-/* attack + decay + OFF */
-static INT32 ENV_CURVE[2*EG_ENT+1];
-
-/* multiple table */
-#define ML 2
-static const UINT32 MUL_TABLE[16]= {
-/* 1/2, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15 */
- 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
-
-/* dummy attack / decay rate ( when rate == 0 ) */
-static INT32 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 INT32 outd[1];
-static INT32 ams;
-static INT32 vib;
-INT32 *ams_table;
-INT32 *vib_table;
-static INT32 amsIncr;
-static INT32 vibIncr;
-static INT32 feedback2; /* connect for SLOT 2 */
-
-/* --------------------- subroutines --------------------- */
-
-INLINE int Limit( int val, int max, int min ) {
- if ( val > max )
- val = max;
- else if ( val < min )
- val = min;
-
- return val;
-}
-
-/* ----- 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 UINT32 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)
-{
- INT32 *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 */
-
-// if(slot&1)
-// if(ksl) {sprintf(errmsg,"doh");howlong=255;ksl=0;}
-
- SLOT->ksl = ksl ? ksl : 31;
-// SLOT->ksl = ksl ? 3-ksl : 31;
- SLOT->TL = (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 )
-{
- UINT32 env_out;
- OPL_SLOT *SLOT;
-
- feedback2 = 0;
- /* SLOT 1 */
- SLOT = &CH->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->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 < 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);
- }
-}
-
-/* ----------- 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] = rate / ARRATE;
- OPL->DR_TABLE[i] = rate / DRRATE;
- }
- for (i = 60;i < 76;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 = malloc(TL_MAX*2*sizeof(INT32))) == NULL)
- return 0;
- if( (SIN_TABLE = malloc(SIN_ENT*4 *sizeof(INT32 *))) == NULL)
- {
- free(TL_TABLE);
- return 0;
- }
- if( (AMS_TABLE = malloc(AMS_ENT*2 *sizeof(INT32))) == NULL)
- {
- free(TL_TABLE);
- free(SIN_TABLE);
- return 0;
- }
- if( (VIB_TABLE = malloc(VIB_ENT*2 *sizeof(INT32))) == 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 = 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] = (1.0/EG_STEP)*pom; /* 1dB */
- AMS_TABLE[AMS_ENT+i] = (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] = VIB_RATE + (pom*0.07); /* +- 7cent */
- VIB_TABLE[VIB_ENT+i] = 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;
- /* 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] = OPL->freqbase * fn * FREQ_RATE * (1<<7) / 2;
- }
- /* LFO freq.table */
- OPL->amsIncr = OPL->rate ? (double)AMS_ENT*(1<<AMS_SHIFT) / OPL->rate * 3.7 * ((double)OPL->clock/3600000) : 0;
- OPL->vibIncr = OPL->rate ? (double)VIB_ENT*(1<<VIB_SHIFT) / OPL->rate * 6.4 * ((double)OPL->clock/3600000) : 0;
-}
-
-/* ---------- write a OPL registers ---------- */
-static void OPLWriteReg(FM_OPL *OPL, int r, int v)
-{
- OPL_CH *CH;
- int slot;
- int 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;
- }
- 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 */
- {
- OPL->ams_table = &AMS_TABLE[v&0x80 ? AMS_ENT : 0];
- OPL->vib_table = &VIB_TABLE[v&0x40 ? VIB_ENT : 0];
- }
- 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, UINT32 *buffer, int length)
-{
- int i;
- UINT32 *buf = buffer;
- UINT32 amsCnt = OPL->amsCnt;
- UINT32 vibCnt = OPL->vibCnt;
- 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[6];
- /* LFO state */
- amsIncr = OPL->amsIncr;
- vibIncr = OPL->vibIncr;
- ams_table = OPL->ams_table;
- vib_table = OPL->vib_table;
- }
- R_CH = 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);
- /* limit check */
- //data = Limit( outd[0] , OPL_MAXOUT, OPL_MINOUT );
- /* store to sound buffer */
- {
- int32 d=outd[0]>>OPL_OUTSB;
- if(d<-32768) d=-32768;
- d+=32768;
- buf[i] += d;
- }
- }
-
- OPL->amsCnt = amsCnt;
- OPL->vibCnt = vibCnt;
-}
-
-/* ---------- reset one of chip ---------- */
-void OPLResetChip(FM_OPL *OPL)
-{
- int c,s;
- int i;
-
- /* reset chip */
- OPL->mode = 0; /* normal mode */
-
- /* reset with register write */
- OPLWriteReg(OPL,0x01,0); /* wabesel disable */
- 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 one of vietual 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 = malloc(state_size);
- 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);
-}
-
-/* ---------- YM3812 I/O interface ---------- */
-void OPLWrite(FM_OPL *OPL,UINT8 a,UINT8 v)
-{
- OPLWriteReg(OPL,a,v);
-}
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