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Bochs/bochs/iodev/sound/opl.cc
Volker Ruppert df6adaaf1f Added symbol VSIDE in the MSVC workspace files and and the manifest section 
of win32res.rc to compile Bochs correctly with both IDE and nmake.
Fixed MSVC warnings in some devices.
2017-03-19 12:22:27 +00:00

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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
/*
* Copyright (C) 2002-2013 The DOSBox Team
* Copyright (C) 2015 The Bochs Project
* OPL2/OPL3 emulation library
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Originally based on ADLIBEMU.C, an AdLib/OPL2 emulation library by Ken Silverman
* Copyright (C) 1998-2001 Ken Silverman
* Ken Silverman's official web site: "http://www.advsys.net/ken"
*/
// Define BX_PLUGGABLE in files that can be compiled into plugins. For
// platforms that require a special tag on exported symbols, BX_PLUGGABLE
// is used to know when we are exporting symbols and when we are importing.
#define BX_PLUGGABLE
#include <math.h>
#include <stdlib.h> // rand()
#include "iodev.h"
#define OPL_SOURCE
#include "opl.h"
#if BX_SUPPORT_SB16
Bit16u opl_index;
static fltype recipsamp; // inverse of sampling rate
static Bit16s wavtable[WAVEPREC*3]; // wave form table
// vibrato/tremolo tables
static Bit32s vib_table[VIBTAB_SIZE];
static Bit32s trem_table[TREMTAB_SIZE*2];
static Bit32s vibval_const[BLOCKBUF_SIZE];
static Bit32s tremval_const[BLOCKBUF_SIZE];
// vibrato value tables (used per-operator)
static Bit32s vibval_var1[BLOCKBUF_SIZE];
static Bit32s vibval_var2[BLOCKBUF_SIZE];
//static Bit32s vibval_var3[BLOCKBUF_SIZE];
//static Bit32s vibval_var4[BLOCKBUF_SIZE];
// vibrato/trmolo value table pointers
static Bit32s *vibval1, *vibval2, *vibval3, *vibval4;
static Bit32s *tremval1, *tremval2, *tremval3, *tremval4;
// key scale level lookup table
static const fltype kslmul[4] = {
0.0, 0.5, 0.25, 1.0 // -> 0, 3, 1.5, 6 dB/oct
};
// frequency multiplicator lookup table
static const fltype frqmul_tab[16] = {
0.5,1,2,3,4,5,6,7,8,9,10,10,12,12,15,15
};
// calculated frequency multiplication values (depend on sampling rate)
static fltype frqmul[16];
// key scale levels
static Bit8u kslev[8][16];
// map a channel number to the register offset of the modulator (=register base)
static const Bit8u modulatorbase[9] = {
0,1,2,
8,9,10,
16,17,18
};
// map a register base to a modulator operator number or operator number
#if defined(OPLTYPE_IS_OPL3)
static const Bit8u regbase2modop[44] = {
0,1,2,0,1,2,0,0,3,4,5,3,4,5,0,0,6,7,8,6,7,8, // first set
18,19,20,18,19,20,0,0,21,22,23,21,22,23,0,0,24,25,26,24,25,26 // second set
};
static const Bit8u regbase2op[44] = {
0,1,2,9,10,11,0,0,3,4,5,12,13,14,0,0,6,7,8,15,16,17, // first set
18,19,20,27,28,29,0,0,21,22,23,30,31,32,0,0,24,25,26,33,34,35 // second set
};
#else
static const Bit8u regbase2modop[22] = {
0,1,2,0,1,2,0,0,3,4,5,3,4,5,0,0,6,7,8,6,7,8
};
static const Bit8u regbase2op[22] = {
0,1,2,9,10,11,0,0,3,4,5,12,13,14,0,0,6,7,8,15,16,17
};
#endif
// start of the waveform
static Bit32u waveform[8] = {
WAVEPREC,
WAVEPREC>>1,
WAVEPREC,
(WAVEPREC*3)>>2,
0,
0,
(WAVEPREC*5)>>2,
WAVEPREC<<1
};
// length of the waveform as mask
static Bit32u wavemask[8] = {
WAVEPREC-1,
WAVEPREC-1,
(WAVEPREC>>1)-1,
(WAVEPREC>>1)-1,
WAVEPREC-1,
((WAVEPREC*3)>>2)-1,
WAVEPREC>>1,
WAVEPREC-1
};
// where the first entry resides
static Bit32u wavestart[8] = {
0,
WAVEPREC>>1,
0,
WAVEPREC>>2,
0,
0,
0,
WAVEPREC>>3
};
// envelope generator function constants
static fltype attackconst[4] = {
(fltype)(1/2.82624),
(fltype)(1/2.25280),
(fltype)(1/1.88416),
(fltype)(1/1.59744)
};
static fltype decrelconst[4] = {
(fltype)(1/39.28064),
(fltype)(1/31.41608),
(fltype)(1/26.17344),
(fltype)(1/22.44608)
};
void operator_advance(op_type* op_pt, Bit32s vib)
{
op_pt->wfpos = op_pt->tcount; // waveform position
// advance waveform time
op_pt->tcount += op_pt->tinc;
op_pt->tcount += (Bit32s)(op_pt->tinc)*vib/FIXEDPT;
op_pt->generator_pos += generator_add;
}
void operator_advance_drums(op_type* op_pt1, Bit32s vib1, op_type* op_pt2, Bit32s vib2, op_type* op_pt3, Bit32s vib3)
{
Bit32u c1 = op_pt1->tcount/FIXEDPT;
Bit32u c3 = op_pt3->tcount/FIXEDPT;
Bit32u phasebit = (((c1 & 0x88) ^ ((c1<<5) & 0x80)) | ((c3 ^ (c3<<2)) & 0x20)) ? 0x02 : 0x00;
Bit32u noisebit = rand()&1;
Bit32u snare_phase_bit = (((Bitu)((op_pt1->tcount/FIXEDPT) / 0x100))&1);
//Hihat
Bit32u inttm = (phasebit<<8) | (0x34<<(phasebit ^ (noisebit<<1)));
op_pt1->wfpos = inttm*FIXEDPT; // waveform position
// advance waveform time
op_pt1->tcount += op_pt1->tinc;
op_pt1->tcount += (Bit32s)(op_pt1->tinc)*vib1/FIXEDPT;
op_pt1->generator_pos += generator_add;
//Snare
inttm = ((1+snare_phase_bit) ^ noisebit)<<8;
op_pt2->wfpos = inttm*FIXEDPT; // waveform position
// advance waveform time
op_pt2->tcount += op_pt2->tinc;
op_pt2->tcount += (Bit32s)(op_pt2->tinc)*vib2/FIXEDPT;
op_pt2->generator_pos += generator_add;
//Cymbal
inttm = (1+phasebit)<<8;
op_pt3->wfpos = inttm*FIXEDPT; // waveform position
// advance waveform time
op_pt3->tcount += op_pt3->tinc;
op_pt3->tcount += (Bit32s)(op_pt3->tinc)*vib3/FIXEDPT;
op_pt3->generator_pos += generator_add;
}
// output level is sustained, mode changes only when operator is turned off (->release)
// or when the keep-sustained bit is turned off (->sustain_nokeep)
void operator_output(op_type* op_pt, Bit32s modulator, Bit32s trem)
{
if (op_pt->op_state != OF_TYPE_OFF) {
op_pt->lastcval = op_pt->cval;
Bit32u i = (Bit32u)((op_pt->wfpos+modulator)/FIXEDPT);
// wform: -16384 to 16383 (0x4000)
// trem : 32768 to 65535 (0x10000)
// step_amp: 0.0 to 1.0
// vol : 1/2^14 to 1/2^29 (/0x4000; /1../0x8000)
op_pt->cval = (Bit32s)(op_pt->step_amp*op_pt->vol*op_pt->cur_wform[i&op_pt->cur_wmask]*trem/16.0);
}
}
// no action, operator is off
void operator_off(op_type* /*op_pt*/)
{
}
// output level is sustained, mode changes only when operator is turned off (->release)
// or when the keep-sustained bit is turned off (->sustain_nokeep)
void operator_sustain(op_type* op_pt)
{
Bit32u num_steps_add = op_pt->generator_pos/FIXEDPT; // number of (standardized) samples
for (Bit32u ct=0; ct<num_steps_add; ct++) {
op_pt->cur_env_step++;
}
op_pt->generator_pos -= num_steps_add*FIXEDPT;
}
// operator in release mode, if output level reaches zero the operator is turned off
void operator_release(op_type* op_pt)
{
// ??? boundary?
if (op_pt->amp > 0.00000001) {
// release phase
op_pt->amp *= op_pt->releasemul;
}
Bit32u num_steps_add = op_pt->generator_pos/FIXEDPT; // number of (standardized) samples
for (Bit32u ct=0; ct<num_steps_add; ct++) {
op_pt->cur_env_step++; // sample counter
if ((op_pt->cur_env_step & op_pt->env_step_r)==0) {
if (op_pt->amp <= 0.00000001) {
// release phase finished, turn off this operator
op_pt->amp = 0.0;
if (op_pt->op_state == OF_TYPE_REL) {
op_pt->op_state = OF_TYPE_OFF;
}
}
op_pt->step_amp = op_pt->amp;
}
}
op_pt->generator_pos -= num_steps_add*FIXEDPT;
}
// operator in decay mode, if sustain level is reached the output level is either
// kept (sustain level keep enabled) or the operator is switched into release mode
void operator_decay(op_type* op_pt)
{
if (op_pt->amp > op_pt->sustain_level) {
// decay phase
op_pt->amp *= op_pt->decaymul;
}
Bit32u num_steps_add = op_pt->generator_pos/FIXEDPT; // number of (standardized) samples
for (Bit32u ct=0; ct<num_steps_add; ct++) {
op_pt->cur_env_step++;
if ((op_pt->cur_env_step & op_pt->env_step_d)==0) {
if (op_pt->amp <= op_pt->sustain_level) {
// decay phase finished, sustain level reached
if (op_pt->sus_keep) {
// keep sustain level (until turned off)
op_pt->op_state = OF_TYPE_SUS;
op_pt->amp = op_pt->sustain_level;
} else {
// next: release phase
op_pt->op_state = OF_TYPE_SUS_NOKEEP;
}
}
op_pt->step_amp = op_pt->amp;
}
}
op_pt->generator_pos -= num_steps_add*FIXEDPT;
}
// operator in attack mode, if full output level is reached,
// the operator is switched into decay mode
void operator_attack(op_type* op_pt)
{
op_pt->amp = ((op_pt->a3*op_pt->amp + op_pt->a2)*op_pt->amp + op_pt->a1)*op_pt->amp + op_pt->a0;
Bit32u num_steps_add = op_pt->generator_pos/FIXEDPT; // number of (standardized) samples
for (Bit32u ct=0; ct<num_steps_add; ct++) {
op_pt->cur_env_step++; // next sample
if ((op_pt->cur_env_step & op_pt->env_step_a)==0) { // check if next step already reached
if (op_pt->amp > 1.0) {
// attack phase finished, next: decay
op_pt->op_state = OF_TYPE_DEC;
op_pt->amp = 1.0;
op_pt->step_amp = 1.0;
}
op_pt->step_skip_pos_a <<= 1;
if (op_pt->step_skip_pos_a==0) op_pt->step_skip_pos_a = 1;
if (op_pt->step_skip_pos_a & op_pt->env_step_skip_a) { // check if required to skip next step
op_pt->step_amp = op_pt->amp;
}
}
}
op_pt->generator_pos -= num_steps_add*FIXEDPT;
}
typedef void (*optype_fptr)(op_type*);
optype_fptr opfuncs[6] = {
operator_attack,
operator_decay,
operator_release,
operator_sustain, // sustain phase (keeping level)
operator_release, // sustain_nokeep phase (release-style)
operator_off
};
void change_attackrate(Bitu regbase, op_type* op_pt)
{
Bits attackrate = adlibreg[ARC_ATTR_DECR+regbase]>>4;
if (attackrate) {
fltype f = (fltype)(pow(FL2,(fltype)attackrate+(op_pt->toff>>2)-1)*attackconst[op_pt->toff&3]*recipsamp);
// attack rate coefficients
op_pt->a0 = (fltype)(0.0377*f);
op_pt->a1 = (fltype)(10.73*f+1);
op_pt->a2 = (fltype)(-17.57*f);
op_pt->a3 = (fltype)(7.42*f);
Bits step_skip = attackrate*4 + op_pt->toff;
Bits steps = step_skip >> 2;
op_pt->env_step_a = (1<<(steps<=12?12-steps:0))-1;
Bits step_num = (step_skip<=48)?(4-(step_skip&3)):0;
static Bit8u step_skip_mask[5] = {0xff, 0xfe, 0xee, 0xba, 0xaa};
op_pt->env_step_skip_a = step_skip_mask[step_num];
#if defined(OPLTYPE_IS_OPL3)
if (step_skip>=60) {
#else
if (step_skip>=62) {
#endif
op_pt->a0 = (fltype)(2.0); // something that triggers an immediate transition to amp:=1.0
op_pt->a1 = (fltype)(0.0);
op_pt->a2 = (fltype)(0.0);
op_pt->a3 = (fltype)(0.0);
}
} else {
// attack disabled
op_pt->a0 = 0.0;
op_pt->a1 = 1.0;
op_pt->a2 = 0.0;
op_pt->a3 = 0.0;
op_pt->env_step_a = 0;
op_pt->env_step_skip_a = 0;
}
}
void change_decayrate(Bitu regbase, op_type* op_pt)
{
Bits decayrate = adlibreg[ARC_ATTR_DECR+regbase]&15;
// decaymul should be 1.0 when decayrate==0
if (decayrate) {
fltype f = (fltype)(-7.4493*decrelconst[op_pt->toff&3]*recipsamp);
op_pt->decaymul = (fltype)(pow(FL2,f*pow(FL2,(fltype)(decayrate+(op_pt->toff>>2)))));
Bits steps = (decayrate*4 + op_pt->toff) >> 2;
op_pt->env_step_d = (1<<(steps<=12?12-steps:0))-1;
} else {
op_pt->decaymul = 1.0;
op_pt->env_step_d = 0;
}
}
void change_releaserate(Bitu regbase, op_type* op_pt)
{
Bits releaserate = adlibreg[ARC_SUSL_RELR+regbase]&15;
// releasemul should be 1.0 when releaserate==0
if (releaserate) {
fltype f = (fltype)(-7.4493*decrelconst[op_pt->toff&3]*recipsamp);
op_pt->releasemul = (fltype)(pow(FL2,f*pow(FL2,(fltype)(releaserate+(op_pt->toff>>2)))));
Bits steps = (releaserate*4 + op_pt->toff) >> 2;
op_pt->env_step_r = (1<<(steps<=12?12-steps:0))-1;
} else {
op_pt->releasemul = 1.0;
op_pt->env_step_r = 0;
}
}
void change_sustainlevel(Bitu regbase, op_type* op_pt)
{
Bits sustainlevel = adlibreg[ARC_SUSL_RELR+regbase]>>4;
// sustainlevel should be 0.0 when sustainlevel==15 (max)
if (sustainlevel<15) {
op_pt->sustain_level = (fltype)(pow(FL2,(fltype)sustainlevel * (-FL05)));
} else {
op_pt->sustain_level = 0.0;
}
}
void change_waveform(Bitu regbase, op_type* op_pt)
{
#if defined(OPLTYPE_IS_OPL3)
if (regbase>=ARC_SECONDSET) regbase -= (ARC_SECONDSET-22); // second set starts at 22
#endif
// waveform selection
op_pt->cur_wvsel = wave_sel[regbase];
op_pt->cur_wmask = wavemask[wave_sel[regbase]];
op_pt->cur_wform = &wavtable[waveform[wave_sel[regbase]]];
// (might need to be adapted to waveform type here...)
}
void change_keepsustain(Bitu regbase, op_type* op_pt)
{
op_pt->sus_keep = (adlibreg[ARC_TVS_KSR_MUL+regbase]&0x20)>0;
if (op_pt->op_state==OF_TYPE_SUS) {
if (!op_pt->sus_keep) op_pt->op_state = OF_TYPE_SUS_NOKEEP;
} else if (op_pt->op_state==OF_TYPE_SUS_NOKEEP) {
if (op_pt->sus_keep) op_pt->op_state = OF_TYPE_SUS;
}
}
// enable/disable vibrato/tremolo LFO effects
void change_vibrato(Bitu regbase, op_type* op_pt)
{
op_pt->vibrato = (adlibreg[ARC_TVS_KSR_MUL+regbase]&0x40)!=0;
op_pt->tremolo = (adlibreg[ARC_TVS_KSR_MUL+regbase]&0x80)!=0;
}
// change amount of self-feedback
void change_feedback(Bitu chanbase, op_type* op_pt)
{
Bits feedback = adlibreg[ARC_FEEDBACK+chanbase]&14;
if (feedback) op_pt->mfbi = (Bit32s)(pow(FL2,(fltype)((feedback>>1)+8)));
else op_pt->mfbi = 0;
}
void change_frequency(Bitu chanbase, Bitu regbase, op_type* op_pt)
{
// frequency
Bit32u frn = ((((Bit32u)adlibreg[ARC_KON_BNUM+chanbase])&3)<<8) + (Bit32u)adlibreg[ARC_FREQ_NUM+chanbase];
// block number/octave
Bit32u oct = ((((Bit32u)adlibreg[ARC_KON_BNUM+chanbase])>>2)&7);
op_pt->freq_high = (Bit32s)((frn>>7)&7);
// keysplit
Bit32u note_sel = (adlibreg[8]>>6)&1;
op_pt->toff = ((frn>>9)&(note_sel^1)) | ((frn>>8)&note_sel);
op_pt->toff += (oct<<1);
// envelope scaling (KSR)
if (!(adlibreg[ARC_TVS_KSR_MUL+regbase]&0x10)) op_pt->toff >>= 2;
// 20+a0+b0:
op_pt->tinc = (Bit32u)((((fltype)(frn<<oct))*frqmul[adlibreg[ARC_TVS_KSR_MUL+regbase]&15]));
// 40+a0+b0:
fltype vol_in = (fltype)((fltype)(adlibreg[ARC_KSL_OUTLEV+regbase]&63) +
kslmul[adlibreg[ARC_KSL_OUTLEV+regbase]>>6]*kslev[oct][frn>>6]);
op_pt->vol = (fltype)(pow(FL2,(fltype)(vol_in * -0.125 - 14)));
// operator frequency changed, care about features that depend on it
change_attackrate(regbase,op_pt);
change_decayrate(regbase,op_pt);
change_releaserate(regbase,op_pt);
}
void enable_operator(Bitu regbase, op_type* op_pt, Bit32u act_type)
{
// check if this is really an off-on transition
if (op_pt->act_state == OP_ACT_OFF) {
Bits wselbase = regbase;
if (wselbase>=ARC_SECONDSET) wselbase -= (ARC_SECONDSET-22); // second set starts at 22
op_pt->tcount = wavestart[wave_sel[wselbase]]*FIXEDPT;
// start with attack mode
op_pt->op_state = OF_TYPE_ATT;
op_pt->act_state |= act_type;
}
}
void disable_operator(op_type* op_pt, Bit32u act_type)
{
// check if this is really an on-off transition
if (op_pt->act_state != OP_ACT_OFF) {
op_pt->act_state &= (~act_type);
if (op_pt->act_state == OP_ACT_OFF) {
if (op_pt->op_state != OF_TYPE_OFF) op_pt->op_state = OF_TYPE_REL;
}
}
}
void adlib_init(Bit32u samplerate)
{
Bits i, j, oct;
int_samplerate = samplerate;
generator_add = (Bit32u)(INTFREQU*FIXEDPT/int_samplerate);
memset((void *)adlibreg,0,sizeof(adlibreg));
memset((void *)op,0,sizeof(op_type)*MAXOPERATORS);
memset((void *)wave_sel,0,sizeof(wave_sel));
for (i=0;i<MAXOPERATORS;i++) {
op[i].op_state = OF_TYPE_OFF;
op[i].act_state = OP_ACT_OFF;
op[i].amp = 0.0;
op[i].step_amp = 0.0;
op[i].vol = 0.0;
op[i].tcount = 0;
op[i].tinc = 0;
op[i].toff = 0;
op[i].cur_wvsel = 0;
op[i].cur_wmask = wavemask[0];
op[i].cur_wform = &wavtable[waveform[0]];
op[i].freq_high = 0;
op[i].generator_pos = 0;
op[i].cur_env_step = 0;
op[i].env_step_a = 0;
op[i].env_step_d = 0;
op[i].env_step_r = 0;
op[i].step_skip_pos_a = 0;
op[i].env_step_skip_a = 0;
#if defined(OPLTYPE_IS_OPL3)
op[i].is_4op = false;
op[i].is_4op_attached = false;
op[i].left_pan = 1;
op[i].right_pan = 1;
#endif
}
recipsamp = 1.0 / (fltype)int_samplerate;
for (i=15;i>=0;i--) {
frqmul[i] = (fltype)(frqmul_tab[i]*INTFREQU/(fltype)WAVEPREC*(fltype)FIXEDPT*recipsamp);
}
status = 0;
opl_index = 0;
// create vibrato table
vib_table[0] = 8;
vib_table[1] = 4;
vib_table[2] = 0;
vib_table[3] = -4;
for (i=4; i<VIBTAB_SIZE; i++) vib_table[i] = vib_table[i-4]*-1;
// vibrato at ~6.1 ?? (opl3 docs say 6.1, opl4 docs say 6.0, y8950 docs say 6.4)
vibtab_add = static_cast<Bit32u>(VIBTAB_SIZE*FIXEDPT_LFO/8192*INTFREQU/int_samplerate);
vibtab_pos = 0;
for (i=0; i<BLOCKBUF_SIZE; i++) vibval_const[i] = 0;
// create tremolo table
Bit32s trem_table_int[TREMTAB_SIZE];
for (i=0; i<14; i++) trem_table_int[i] = (Bit32s)(i-13); // upwards (13 to 26 -> -0.5/6 to 0)
for (i=14; i<41; i++) trem_table_int[i] = (Bit32s)(-i+14); // downwards (26 to 0 -> 0 to -1/6)
for (i=41; i<53; i++) trem_table_int[i] = (Bit32s)(i-40-26); // upwards (1 to 12 -> -1/6 to -0.5/6)
for (i=0; i<TREMTAB_SIZE; i++) {
// 0.0 .. -26/26*4.8/6 == [0.0 .. -0.8], 4/53 steps == [1 .. 0.57]
fltype trem_val1=(fltype)(((fltype)trem_table_int[i])*4.8/26.0/6.0); // 4.8db
fltype trem_val2=(fltype)((fltype)((Bit32s)(trem_table_int[i]/4))*1.2/6.0/6.0); // 1.2db (larger stepping)
trem_table[i] = (Bit32s)(pow(FL2,trem_val1)*FIXEDPT);
trem_table[TREMTAB_SIZE+i] = (Bit32s)(pow(FL2,trem_val2)*FIXEDPT);
}
// tremolo at 3.7hz
tremtab_add = (Bit32u)((fltype)TREMTAB_SIZE * TREM_FREQ * FIXEDPT_LFO / (fltype)int_samplerate);
tremtab_pos = 0;
for (i=0; i<BLOCKBUF_SIZE; i++) tremval_const[i] = FIXEDPT;
static Bitu initfirstime = 0;
if (!initfirstime) {
initfirstime = 1;
// create waveform tables
for (i=0;i<(WAVEPREC>>1);i++) {
wavtable[(i<<1) +WAVEPREC] = (Bit16s)(16384*sin((fltype)((i<<1) )*PI*2/WAVEPREC));
wavtable[(i<<1)+1+WAVEPREC] = (Bit16s)(16384*sin((fltype)((i<<1)+1)*PI*2/WAVEPREC));
wavtable[i] = wavtable[(i<<1) +WAVEPREC];
// alternative: (zero-less)
/* wavtable[(i<<1) +WAVEPREC] = (Bit16s)(16384*sin((fltype)((i<<2)+1)*PI/WAVEPREC));
wavtable[(i<<1)+1+WAVEPREC] = (Bit16s)(16384*sin((fltype)((i<<2)+3)*PI/WAVEPREC));
wavtable[i] = wavtable[(i<<1)-1+WAVEPREC]; */
}
for (i=0;i<(WAVEPREC>>3);i++) {
wavtable[i+(WAVEPREC<<1)] = wavtable[i+(WAVEPREC>>3)]-16384;
wavtable[i+((WAVEPREC*17)>>3)] = wavtable[i+(WAVEPREC>>2)]+16384;
}
// key scale level table verified ([table in book]*8/3)
kslev[7][0] = 0; kslev[7][1] = 24; kslev[7][2] = 32; kslev[7][3] = 37;
kslev[7][4] = 40; kslev[7][5] = 43; kslev[7][6] = 45; kslev[7][7] = 47;
kslev[7][8] = 48;
for (i=9;i<16;i++) kslev[7][i] = (Bit8u)(i+41);
for (j=6;j>=0;j--) {
for (i=0;i<16;i++) {
oct = (Bits)kslev[j+1][i]-8;
if (oct < 0) oct = 0;
kslev[j][i] = (Bit8u)oct;
}
}
}
}
void adlib_write(Bitu idx, Bit8u val)
{
Bit32u second_set = idx&0x100;
adlibreg[idx] = val;
switch (idx&0xf0) {
case ARC_CONTROL:
// here we check for the second set registers, too:
switch (idx) {
case 0x02: // timer1 counter
case 0x03: // timer2 counter
break;
case 0x04:
// IRQ reset, timer mask/start
if (val&0x80) {
// clear IRQ bits in status register
status &= ~0x60;
} else {
status = 0;
}
break;
#if defined(OPLTYPE_IS_OPL3)
case 0x04|ARC_SECONDSET:
// 4op enable/disable switches for each possible channel
op[0].is_4op = (val&1)>0;
op[3].is_4op_attached = op[0].is_4op;
op[1].is_4op = (val&2)>0;
op[4].is_4op_attached = op[1].is_4op;
op[2].is_4op = (val&4)>0;
op[5].is_4op_attached = op[2].is_4op;
op[18].is_4op = (val&8)>0;
op[21].is_4op_attached = op[18].is_4op;
op[19].is_4op = (val&16)>0;
op[22].is_4op_attached = op[19].is_4op;
op[20].is_4op = (val&32)>0;
op[23].is_4op_attached = op[20].is_4op;
break;
case 0x05|ARC_SECONDSET:
break;
#endif
case 0x08:
// CSW, note select
break;
default:
break;
}
break;
case ARC_TVS_KSR_MUL:
case ARC_TVS_KSR_MUL+0x10: {
// tremolo/vibrato/sustain keeping enabled; key scale rate; frequency multiplication
int num = idx&7;
Bitu base = (idx-ARC_TVS_KSR_MUL)&0xff;
if ((num<6) && (base<22)) {
Bitu modop = regbase2modop[second_set?(base+22):base];
Bitu regbase = base+second_set;
Bitu chanbase = second_set?(modop-18+ARC_SECONDSET):modop;
// change tremolo/vibrato and sustain keeping of this operator
op_type* op_ptr = &op[modop+((num<3) ? 0 : 9)];
change_keepsustain(regbase,op_ptr);
change_vibrato(regbase,op_ptr);
// change frequency calculations of this operator as
// key scale rate and frequency multiplicator can be changed
#if defined(OPLTYPE_IS_OPL3)
if ((adlibreg[0x105]&1) && (op[modop].is_4op_attached)) {
// operator uses frequency of channel
change_frequency(chanbase-3,regbase,op_ptr);
} else {
change_frequency(chanbase,regbase,op_ptr);
}
#else
change_frequency(chanbase,base,op_ptr);
#endif
}
}
break;
case ARC_KSL_OUTLEV:
case ARC_KSL_OUTLEV+0x10: {
// key scale level; output rate
int num = idx&7;
Bitu base = (idx-ARC_KSL_OUTLEV)&0xff;
if ((num<6) && (base<22)) {
Bitu modop = regbase2modop[second_set?(base+22):base];
Bitu chanbase = second_set?(modop-18+ARC_SECONDSET):modop;
// change frequency calculations of this operator as
// key scale level and output rate can be changed
op_type* op_ptr = &op[modop+((num<3) ? 0 : 9)];
#if defined(OPLTYPE_IS_OPL3)
Bitu regbase = base+second_set;
if ((adlibreg[0x105]&1) && (op[modop].is_4op_attached)) {
// operator uses frequency of channel
change_frequency(chanbase-3,regbase,op_ptr);
} else {
change_frequency(chanbase,regbase,op_ptr);
}
#else
change_frequency(chanbase,base,op_ptr);
#endif
}
}
break;
case ARC_ATTR_DECR:
case ARC_ATTR_DECR+0x10: {
// attack/decay rates
int num = idx&7;
Bitu base = (idx-ARC_ATTR_DECR)&0xff;
if ((num<6) && (base<22)) {
Bitu regbase = base+second_set;
// change attack rate and decay rate of this operator
op_type* op_ptr = &op[regbase2op[second_set?(base+22):base]];
change_attackrate(regbase,op_ptr);
change_decayrate(regbase,op_ptr);
}
}
break;
case ARC_SUSL_RELR:
case ARC_SUSL_RELR+0x10: {
// sustain level; release rate
int num = idx&7;
Bitu base = (idx-ARC_SUSL_RELR)&0xff;
if ((num<6) && (base<22)) {
Bitu regbase = base+second_set;
// change sustain level and release rate of this operator
op_type* op_ptr = &op[regbase2op[second_set?(base+22):base]];
change_releaserate(regbase,op_ptr);
change_sustainlevel(regbase,op_ptr);
}
}
break;
case ARC_FREQ_NUM: {
// 0xa0-0xa8 low8 frequency
Bitu base = (idx-ARC_FREQ_NUM)&0xff;
if (base<9) {
Bits opbase = second_set?(base+18):base;
#if defined(OPLTYPE_IS_OPL3)
if ((adlibreg[0x105]&1) && op[opbase].is_4op_attached) break;
#endif
// regbase of modulator:
Bits modbase = modulatorbase[base]+second_set;
Bitu chanbase = base+second_set;
change_frequency(chanbase,modbase,&op[opbase]);
change_frequency(chanbase,modbase+3,&op[opbase+9]);
#if defined(OPLTYPE_IS_OPL3)
// for 4op channels all four operators are modified to the frequency of the channel
if ((adlibreg[0x105]&1) && op[second_set?(base+18):base].is_4op) {
change_frequency(chanbase,modbase+8,&op[opbase+3]);
change_frequency(chanbase,modbase+3+8,&op[opbase+3+9]);
}
#endif
}
}
break;
case ARC_KON_BNUM: {
if (idx == ARC_PERC_MODE) {
#if defined(OPLTYPE_IS_OPL3)
if (second_set) return;
#endif
if ((val&0x30) == 0x30) { // BassDrum active
enable_operator(16,&op[6],OP_ACT_PERC);
change_frequency(6,16,&op[6]);
enable_operator(16+3,&op[6+9],OP_ACT_PERC);
change_frequency(6,16+3,&op[6+9]);
} else {
disable_operator(&op[6],OP_ACT_PERC);
disable_operator(&op[6+9],OP_ACT_PERC);
}
if ((val&0x28) == 0x28) { // Snare active
enable_operator(17+3,&op[16],OP_ACT_PERC);
change_frequency(7,17+3,&op[16]);
} else {
disable_operator(&op[16],OP_ACT_PERC);
}
if ((val&0x24) == 0x24) { // TomTom active
enable_operator(18,&op[8],OP_ACT_PERC);
change_frequency(8,18,&op[8]);
} else {
disable_operator(&op[8],OP_ACT_PERC);
}
if ((val&0x22) == 0x22) { // Cymbal active
enable_operator(18+3,&op[8+9],OP_ACT_PERC);
change_frequency(8,18+3,&op[8+9]);
} else {
disable_operator(&op[8+9],OP_ACT_PERC);
}
if ((val&0x21) == 0x21) { // Hihat active
enable_operator(17,&op[7],OP_ACT_PERC);
change_frequency(7,17,&op[7]);
} else {
disable_operator(&op[7],OP_ACT_PERC);
}
break;
}
// regular 0xb0-0xb8
Bitu base = (idx-ARC_KON_BNUM)&0xff;
if (base<9) {
Bits opbase = second_set?(base+18):base;
#if defined(OPLTYPE_IS_OPL3)
if ((adlibreg[0x105]&1) && op[opbase].is_4op_attached) break;
#endif
// regbase of modulator:
Bits modbase = modulatorbase[base]+second_set;
if (val&32) {
// operator switched on
enable_operator(modbase,&op[opbase],OP_ACT_NORMAL); // modulator (if 2op)
enable_operator(modbase+3,&op[opbase+9],OP_ACT_NORMAL); // carrier (if 2op)
#if defined(OPLTYPE_IS_OPL3)
// for 4op channels all four operators are switched on
if ((adlibreg[0x105]&1) && op[opbase].is_4op) {
// turn on chan+3 operators as well
enable_operator(modbase+8,&op[opbase+3],OP_ACT_NORMAL);
enable_operator(modbase+3+8,&op[opbase+3+9],OP_ACT_NORMAL);
}
#endif
} else {
// operator switched off
disable_operator(&op[opbase],OP_ACT_NORMAL);
disable_operator(&op[opbase+9],OP_ACT_NORMAL);
#if defined(OPLTYPE_IS_OPL3)
// for 4op channels all four operators are switched off
if ((adlibreg[0x105]&1) && op[opbase].is_4op) {
// turn off chan+3 operators as well
disable_operator(&op[opbase+3],OP_ACT_NORMAL);
disable_operator(&op[opbase+3+9],OP_ACT_NORMAL);
}
#endif
}
Bitu chanbase = base+second_set;
// change frequency calculations of modulator and carrier (2op) as
// the frequency of the channel has changed
change_frequency(chanbase,modbase,&op[opbase]);
change_frequency(chanbase,modbase+3,&op[opbase+9]);
#if defined(OPLTYPE_IS_OPL3)
// for 4op channels all four operators are modified to the frequency of the channel
if ((adlibreg[0x105]&1) && op[second_set?(base+18):base].is_4op) {
// change frequency calculations of chan+3 operators as well
change_frequency(chanbase,modbase+8,&op[opbase+3]);
change_frequency(chanbase,modbase+3+8,&op[opbase+3+9]);
}
#endif
}
}
break;
case ARC_FEEDBACK: {
// 0xc0-0xc8 feedback/modulation type (AM/FM)
Bitu base = (idx-ARC_FEEDBACK)&0xff;
if (base<9) {
Bits opbase = second_set?(base+18):base;
Bitu chanbase = base+second_set;
change_feedback(chanbase,&op[opbase]);
#if defined(OPLTYPE_IS_OPL3)
// OPL3 panning
op[opbase].left_pan = ((val&0x10)>>4);
op[opbase].right_pan = ((val&0x20)>>5);
#endif
}
}
break;
case ARC_WAVE_SEL:
case ARC_WAVE_SEL+0x10: {
int num = idx&7;
Bitu base = (idx-ARC_WAVE_SEL)&0xff;
if ((num<6) && (base<22)) {
#if defined(OPLTYPE_IS_OPL3)
Bits wselbase = second_set?(base+22):base; // for easier mapping onto wave_sel[]
// change waveform
if (adlibreg[0x105]&1) wave_sel[wselbase] = val&7; // opl3 mode enabled, all waveforms accessible
else wave_sel[wselbase] = val&3;
op_type* op_ptr = &op[regbase2modop[wselbase]+((num<3) ? 0 : 9)];
change_waveform(wselbase,op_ptr);
#else
if (adlibreg[0x01]&0x20) {
// wave selection enabled, change waveform
wave_sel[base] = val&3;
op_type* op_ptr = &op[regbase2modop[base]+((num<3) ? 0 : 9)];
change_waveform(base,op_ptr);
}
#endif
}
}
break;
default:
break;
}
}
Bitu adlib_reg_read(Bitu port)
{
#if defined(OPLTYPE_IS_OPL3)
// opl3-detection routines require ret&6 to be zero
if ((port&1)==0) {
return status;
}
return 0x00;
#else
// opl2-detection routines require ret&6 to be 6
if ((port&1)==0) {
return status|6;
}
return 0xff;
#endif
}
void adlib_write_index(Bitu port, Bit8u val)
{
opl_index = val;
#if defined(OPLTYPE_IS_OPL3)
if ((port&3)!=0) {
// possibly second set
if (((adlibreg[0x105]&1)!=0) || (opl_index==5)) opl_index |= ARC_SECONDSET;
}
#endif
}
static void OPL_INLINE clipit16(Bit32s ival, Bit16s* outval, Bit8u vol)
{
if (vol != 0xff) {
ival = ival * vol / 255;
}
if (ival<32768) {
if (ival>-32769) {
*outval=(Bit16s)ival;
} else {
*outval = -32768;
}
} else {
*outval = 32767;
}
#ifdef BX_BIG_ENDIAN
*outval = bx_bswap16((Bit16u)*outval);
#endif
}
// be careful with this
// uses cptr and chanval, outputs into outbufl(/outbufr)
// for opl3 check if opl3-mode is enabled (which uses stereo panning)
#undef CHANVAL_OUT
#if defined(OPLTYPE_IS_OPL3)
#define CHANVAL_OUT \
if (adlibreg[0x105]&1) { \
outbufl[i] += chanval*cptr[0].left_pan; \
outbufr[i] += chanval*cptr[0].right_pan; \
} else { \
outbufl[i] += chanval; \
} \
opl_active = 1;
#else
#define CHANVAL_OUT \
outbufl[i] += chanval; \
opl_active = 1;
#endif
bx_bool adlib_getsample(Bit16u rate, Bit16s* sndptr, Bits numsamples, Bit16u volume)
{
Bit8u lvol, rvol;
Bits i, endsamples;
op_type* cptr;
bx_bool opl_active = 0;
Bit32s outbufl[BLOCKBUF_SIZE];
#if defined(OPLTYPE_IS_OPL3)
// second output buffer (right channel for opl3 stereo)
Bit32s outbufr[BLOCKBUF_SIZE];
#endif
// vibrato/tremolo lookup tables (global, to possibly be used by all operators)
Bit32s vib_lut[BLOCKBUF_SIZE];
Bit32s trem_lut[BLOCKBUF_SIZE];
lvol = (Bit8u)(volume & 0xff);
rvol = (Bit8u)(volume >> 8);
Bits samples_to_process = numsamples;
if (rate != (Bit16u)int_samplerate) {
adlib_init(rate);
}
for (Bits cursmp=0; cursmp<samples_to_process; cursmp+=endsamples) {
endsamples = samples_to_process-cursmp;
if (endsamples>BLOCKBUF_SIZE) endsamples = BLOCKBUF_SIZE;
memset((void*)&outbufl, 0, (size_t)endsamples*sizeof(Bit32s));
#if defined(OPLTYPE_IS_OPL3)
// clear second output buffer (opl3 stereo)
if (adlibreg[0x105]&1) memset((void*)&outbufr, 0, (size_t)endsamples*sizeof(Bit32s));
#endif
// calculate vibrato/tremolo lookup tables
Bit32s vib_tshift = ((adlibreg[ARC_PERC_MODE]&0x40)==0) ? 1 : 0; // 14cents/7cents switching
for (i=0;i<endsamples;i++) {
// cycle through vibrato table
vibtab_pos += vibtab_add;
if (vibtab_pos/FIXEDPT_LFO>=VIBTAB_SIZE) vibtab_pos-=VIBTAB_SIZE*FIXEDPT_LFO;
vib_lut[i] = vib_table[vibtab_pos/FIXEDPT_LFO]>>vib_tshift; // 14cents (14/100 of a semitone) or 7cents
// cycle through tremolo table
tremtab_pos += tremtab_add;
if (tremtab_pos/FIXEDPT_LFO>=TREMTAB_SIZE) tremtab_pos-=TREMTAB_SIZE*FIXEDPT_LFO;
if (adlibreg[ARC_PERC_MODE]&0x80) trem_lut[i] = trem_table[tremtab_pos/FIXEDPT_LFO];
else trem_lut[i] = trem_table[TREMTAB_SIZE+tremtab_pos/FIXEDPT_LFO];
}
if (adlibreg[ARC_PERC_MODE]&0x20) {
//BassDrum
cptr = &op[6];
if (adlibreg[ARC_FEEDBACK+6]&1) {
// additive synthesis
if (cptr[9].op_state != OF_TYPE_OFF) {
if (cptr[9].vibrato) {
vibval1 = vibval_var1;
for (i=0;i<endsamples;i++)
vibval1[i] = (Bit32s)((vib_lut[i]*cptr[9].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval1 = vibval_const;
if (cptr[9].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
operator_advance(&cptr[9],vibval1[i]);
opfuncs[cptr[9].op_state](&cptr[9]);
operator_output(&cptr[9],0,tremval1[i]);
Bit32s chanval = cptr[9].cval*2;
CHANVAL_OUT
}
}
} else {
// frequency modulation
if ((cptr[9].op_state != OF_TYPE_OFF) || (cptr[0].op_state != OF_TYPE_OFF)) {
if ((cptr[0].vibrato) && (cptr[0].op_state != OF_TYPE_OFF)) {
vibval1 = vibval_var1;
for (i=0;i<endsamples;i++)
vibval1[i] = (Bit32s)((vib_lut[i]*cptr[0].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval1 = vibval_const;
if ((cptr[9].vibrato) && (cptr[9].op_state != OF_TYPE_OFF)) {
vibval2 = vibval_var2;
for (i=0;i<endsamples;i++)
vibval2[i] = (Bit32s)((vib_lut[i]*cptr[9].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval2 = vibval_const;
if (cptr[0].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
if (cptr[9].tremolo) tremval2 = trem_lut; // tremolo enabled, use table
else tremval2 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
operator_advance(&cptr[0],vibval1[i]);
opfuncs[cptr[0].op_state](&cptr[0]);
operator_output(&cptr[0],(cptr[0].lastcval+cptr[0].cval)*cptr[0].mfbi/2,tremval1[i]);
operator_advance(&cptr[9],vibval2[i]);
opfuncs[cptr[9].op_state](&cptr[9]);
operator_output(&cptr[9],cptr[0].cval*FIXEDPT,tremval2[i]);
Bit32s chanval = cptr[9].cval*2;
CHANVAL_OUT
}
}
}
//TomTom (j=8)
if (op[8].op_state != OF_TYPE_OFF) {
cptr = &op[8];
if (cptr[0].vibrato) {
vibval3 = vibval_var1;
for (i=0;i<endsamples;i++)
vibval3[i] = (Bit32s)((vib_lut[i]*cptr[0].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval3 = vibval_const;
if (cptr[0].tremolo) tremval3 = trem_lut; // tremolo enabled, use table
else tremval3 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
operator_advance(&cptr[0],vibval3[i]);
opfuncs[cptr[0].op_state](&cptr[0]); //TomTom
operator_output(&cptr[0],0,tremval3[i]);
Bit32s chanval = cptr[0].cval*2;
CHANVAL_OUT
}
}
//Snare/Hihat (j=7), Cymbal (j=8)
if ((op[7].op_state != OF_TYPE_OFF) || (op[16].op_state != OF_TYPE_OFF) ||
(op[17].op_state != OF_TYPE_OFF)) {
cptr = &op[7];
if ((cptr[0].vibrato) && (cptr[0].op_state != OF_TYPE_OFF)) {
vibval1 = vibval_var1;
for (i=0;i<endsamples;i++)
vibval1[i] = (Bit32s)((vib_lut[i]*cptr[0].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval1 = vibval_const;
if ((cptr[9].vibrato) && (cptr[9].op_state == OF_TYPE_OFF)) {
vibval2 = vibval_var2;
for (i=0;i<endsamples;i++)
vibval2[i] = (Bit32s)((vib_lut[i]*cptr[9].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval2 = vibval_const;
if (cptr[0].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
if (cptr[9].tremolo) tremval2 = trem_lut; // tremolo enabled, use table
else tremval2 = tremval_const;
cptr = &op[8];
if ((cptr[9].vibrato) && (cptr[9].op_state == OF_TYPE_OFF)) {
vibval4 = vibval_var2;
for (i=0;i<endsamples;i++)
vibval4[i] = (Bit32s)((vib_lut[i]*cptr[9].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval4 = vibval_const;
if (cptr[9].tremolo) tremval4 = trem_lut; // tremolo enabled, use table
else tremval4 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
operator_advance_drums(&op[7],vibval1[i],&op[7+9],vibval2[i],&op[8+9],vibval4[i]);
opfuncs[op[7].op_state](&op[7]); //Hihat
operator_output(&op[7],0,tremval1[i]);
opfuncs[op[7+9].op_state](&op[7+9]); //Snare
operator_output(&op[7+9],0,tremval2[i]);
opfuncs[op[8+9].op_state](&op[8+9]); //Cymbal
operator_output(&op[8+9],0,tremval4[i]);
Bit32s chanval = (op[7].cval + op[7+9].cval + op[8+9].cval)*2;
CHANVAL_OUT
}
}
}
Bitu max_channel = NUM_CHANNELS;
#if defined(OPLTYPE_IS_OPL3)
if ((adlibreg[0x105]&1)==0) max_channel = NUM_CHANNELS/2;
#endif
for (Bits cur_ch=max_channel-1; cur_ch>=0; cur_ch--) {
// skip drum/percussion operators
if ((adlibreg[ARC_PERC_MODE]&0x20) && (cur_ch >= 6) && (cur_ch < 9)) continue;
Bitu k = cur_ch;
#if defined(OPLTYPE_IS_OPL3)
if (cur_ch < 9) {
cptr = &op[cur_ch];
} else {
cptr = &op[cur_ch+9]; // second set is operator18-operator35
k += (-9+256); // second set uses registers 0x100 onwards
}
// check if this operator is part of a 4-op
if ((adlibreg[0x105]&1) && cptr->is_4op_attached) continue;
#else
cptr = &op[cur_ch];
#endif
// check for FM/AM
if (adlibreg[ARC_FEEDBACK+k]&1) {
#if defined(OPLTYPE_IS_OPL3)
if ((adlibreg[0x105]&1) && cptr->is_4op) {
if (adlibreg[ARC_FEEDBACK+k+3]&1) {
// AM-AM-style synthesis (op1[fb] + (op2 * op3) + op4)
if (cptr[0].op_state != OF_TYPE_OFF) {
if (cptr[0].vibrato) {
vibval1 = vibval_var1;
for (i=0;i<endsamples;i++)
vibval1[i] = (Bit32s)((vib_lut[i]*cptr[0].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval1 = vibval_const;
if (cptr[0].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
operator_advance(&cptr[0],vibval1[i]);
opfuncs[cptr[0].op_state](&cptr[0]);
operator_output(&cptr[0],(cptr[0].lastcval+cptr[0].cval)*cptr[0].mfbi/2,tremval1[i]);
Bit32s chanval = cptr[0].cval;
CHANVAL_OUT
}
}
if ((cptr[3].op_state != OF_TYPE_OFF) || (cptr[9].op_state != OF_TYPE_OFF)) {
if ((cptr[9].vibrato) && (cptr[9].op_state != OF_TYPE_OFF)) {
vibval1 = vibval_var1;
for (i=0;i<endsamples;i++)
vibval1[i] = (Bit32s)((vib_lut[i]*cptr[9].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval1 = vibval_const;
if (cptr[9].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
if (cptr[3].tremolo) tremval2 = trem_lut; // tremolo enabled, use table
else tremval2 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
operator_advance(&cptr[9],vibval1[i]);
opfuncs[cptr[9].op_state](&cptr[9]);
operator_output(&cptr[9],0,tremval1[i]);
operator_advance(&cptr[3],0);
opfuncs[cptr[3].op_state](&cptr[3]);
operator_output(&cptr[3],cptr[9].cval*FIXEDPT,tremval2[i]);
Bit32s chanval = cptr[3].cval;
CHANVAL_OUT
}
}
if (cptr[3+9].op_state != OF_TYPE_OFF) {
if (cptr[3+9].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
operator_advance(&cptr[3+9],0);
opfuncs[cptr[3+9].op_state](&cptr[3+9]);
operator_output(&cptr[3+9],0,tremval1[i]);
Bit32s chanval = cptr[3+9].cval;
CHANVAL_OUT
}
}
} else {
// AM-FM-style synthesis (op1[fb] + (op2 * op3 * op4))
if (cptr[0].op_state != OF_TYPE_OFF) {
if (cptr[0].vibrato) {
vibval1 = vibval_var1;
for (i=0;i<endsamples;i++)
vibval1[i] = (Bit32s)((vib_lut[i]*cptr[0].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval1 = vibval_const;
if (cptr[0].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
operator_advance(&cptr[0],vibval1[i]);
opfuncs[cptr[0].op_state](&cptr[0]);
operator_output(&cptr[0],(cptr[0].lastcval+cptr[0].cval)*cptr[0].mfbi/2,tremval1[i]);
Bit32s chanval = cptr[0].cval;
CHANVAL_OUT
}
}
if ((cptr[9].op_state != OF_TYPE_OFF) || (cptr[3].op_state != OF_TYPE_OFF) || (cptr[3+9].op_state != OF_TYPE_OFF)) {
if ((cptr[9].vibrato) && (cptr[9].op_state != OF_TYPE_OFF)) {
vibval1 = vibval_var1;
for (i=0;i<endsamples;i++)
vibval1[i] = (Bit32s)((vib_lut[i]*cptr[9].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval1 = vibval_const;
if (cptr[9].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
if (cptr[3].tremolo) tremval2 = trem_lut; // tremolo enabled, use table
else tremval2 = tremval_const;
if (cptr[3+9].tremolo) tremval3 = trem_lut; // tremolo enabled, use table
else tremval3 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
operator_advance(&cptr[9],vibval1[i]);
opfuncs[cptr[9].op_state](&cptr[9]);
operator_output(&cptr[9],0,tremval1[i]);
operator_advance(&cptr[3],0);
opfuncs[cptr[3].op_state](&cptr[3]);
operator_output(&cptr[3],cptr[9].cval*FIXEDPT,tremval2[i]);
operator_advance(&cptr[3+9],0);
opfuncs[cptr[3+9].op_state](&cptr[3+9]);
operator_output(&cptr[3+9],cptr[3].cval*FIXEDPT,tremval3[i]);
Bit32s chanval = cptr[3+9].cval;
CHANVAL_OUT
}
}
}
continue;
}
#endif
// 2op additive synthesis
if ((cptr[9].op_state == OF_TYPE_OFF) && (cptr[0].op_state == OF_TYPE_OFF)) continue;
if ((cptr[0].vibrato) && (cptr[0].op_state != OF_TYPE_OFF)) {
vibval1 = vibval_var1;
for (i=0;i<endsamples;i++)
vibval1[i] = (Bit32s)((vib_lut[i]*cptr[0].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval1 = vibval_const;
if ((cptr[9].vibrato) && (cptr[9].op_state != OF_TYPE_OFF)) {
vibval2 = vibval_var2;
for (i=0;i<endsamples;i++)
vibval2[i] = (Bit32s)((vib_lut[i]*cptr[9].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval2 = vibval_const;
if (cptr[0].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
if (cptr[9].tremolo) tremval2 = trem_lut; // tremolo enabled, use table
else tremval2 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
// carrier1
operator_advance(&cptr[0],vibval1[i]);
opfuncs[cptr[0].op_state](&cptr[0]);
operator_output(&cptr[0],(cptr[0].lastcval+cptr[0].cval)*cptr[0].mfbi/2,tremval1[i]);
// carrier2
operator_advance(&cptr[9],vibval2[i]);
opfuncs[cptr[9].op_state](&cptr[9]);
operator_output(&cptr[9],0,tremval2[i]);
Bit32s chanval = cptr[9].cval + cptr[0].cval;
CHANVAL_OUT
}
} else {
#if defined(OPLTYPE_IS_OPL3)
if ((adlibreg[0x105]&1) && cptr->is_4op) {
if (adlibreg[ARC_FEEDBACK+k+3]&1) {
// FM-AM-style synthesis ((op1[fb] * op2) + (op3 * op4))
if ((cptr[0].op_state != OF_TYPE_OFF) || (cptr[9].op_state != OF_TYPE_OFF)) {
if ((cptr[0].vibrato) && (cptr[0].op_state != OF_TYPE_OFF)) {
vibval1 = vibval_var1;
for (i=0;i<endsamples;i++)
vibval1[i] = (Bit32s)((vib_lut[i]*cptr[0].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval1 = vibval_const;
if ((cptr[9].vibrato) && (cptr[9].op_state != OF_TYPE_OFF)) {
vibval2 = vibval_var2;
for (i=0;i<endsamples;i++)
vibval2[i] = (Bit32s)((vib_lut[i]*cptr[9].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval2 = vibval_const;
if (cptr[0].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
if (cptr[9].tremolo) tremval2 = trem_lut; // tremolo enabled, use table
else tremval2 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
operator_advance(&cptr[0],vibval1[i]);
opfuncs[cptr[0].op_state](&cptr[0]);
operator_output(&cptr[0],(cptr[0].lastcval+cptr[0].cval)*cptr[0].mfbi/2,tremval1[i]);
operator_advance(&cptr[9],vibval2[i]);
opfuncs[cptr[9].op_state](&cptr[9]);
operator_output(&cptr[9],cptr[0].cval*FIXEDPT,tremval2[i]);
Bit32s chanval = cptr[9].cval;
CHANVAL_OUT
}
}
if ((cptr[3].op_state != OF_TYPE_OFF) || (cptr[3+9].op_state != OF_TYPE_OFF)) {
if (cptr[3].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
if (cptr[3+9].tremolo) tremval2 = trem_lut; // tremolo enabled, use table
else tremval2 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
operator_advance(&cptr[3],0);
opfuncs[cptr[3].op_state](&cptr[3]);
operator_output(&cptr[3],0,tremval1[i]);
operator_advance(&cptr[3+9],0);
opfuncs[cptr[3+9].op_state](&cptr[3+9]);
operator_output(&cptr[3+9],cptr[3].cval*FIXEDPT,tremval2[i]);
Bit32s chanval = cptr[3+9].cval;
CHANVAL_OUT
}
}
} else {
// FM-FM-style synthesis (op1[fb] * op2 * op3 * op4)
if ((cptr[0].op_state != OF_TYPE_OFF) || (cptr[9].op_state != OF_TYPE_OFF) ||
(cptr[3].op_state != OF_TYPE_OFF) || (cptr[3+9].op_state != OF_TYPE_OFF)) {
if ((cptr[0].vibrato) && (cptr[0].op_state != OF_TYPE_OFF)) {
vibval1 = vibval_var1;
for (i=0;i<endsamples;i++)
vibval1[i] = (Bit32s)((vib_lut[i]*cptr[0].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval1 = vibval_const;
if ((cptr[9].vibrato) && (cptr[9].op_state != OF_TYPE_OFF)) {
vibval2 = vibval_var2;
for (i=0;i<endsamples;i++)
vibval2[i] = (Bit32s)((vib_lut[i]*cptr[9].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval2 = vibval_const;
if (cptr[0].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
if (cptr[9].tremolo) tremval2 = trem_lut; // tremolo enabled, use table
else tremval2 = tremval_const;
if (cptr[3].tremolo) tremval3 = trem_lut; // tremolo enabled, use table
else tremval3 = tremval_const;
if (cptr[3+9].tremolo) tremval4 = trem_lut; // tremolo enabled, use table
else tremval4 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
operator_advance(&cptr[0],vibval1[i]);
opfuncs[cptr[0].op_state](&cptr[0]);
operator_output(&cptr[0],(cptr[0].lastcval+cptr[0].cval)*cptr[0].mfbi/2,tremval1[i]);
operator_advance(&cptr[9],vibval2[i]);
opfuncs[cptr[9].op_state](&cptr[9]);
operator_output(&cptr[9],cptr[0].cval*FIXEDPT,tremval2[i]);
operator_advance(&cptr[3],0);
opfuncs[cptr[3].op_state](&cptr[3]);
operator_output(&cptr[3],cptr[9].cval*FIXEDPT,tremval3[i]);
operator_advance(&cptr[3+9],0);
opfuncs[cptr[3+9].op_state](&cptr[3+9]);
operator_output(&cptr[3+9],cptr[3].cval*FIXEDPT,tremval4[i]);
Bit32s chanval = cptr[3+9].cval;
CHANVAL_OUT
}
}
}
continue;
}
#endif
// 2op frequency modulation
if ((cptr[9].op_state == OF_TYPE_OFF) && (cptr[0].op_state == OF_TYPE_OFF)) continue;
if ((cptr[0].vibrato) && (cptr[0].op_state != OF_TYPE_OFF)) {
vibval1 = vibval_var1;
for (i=0;i<endsamples;i++)
vibval1[i] = (Bit32s)((vib_lut[i]*cptr[0].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval1 = vibval_const;
if ((cptr[9].vibrato) && (cptr[9].op_state != OF_TYPE_OFF)) {
vibval2 = vibval_var2;
for (i=0;i<endsamples;i++)
vibval2[i] = (Bit32s)((vib_lut[i]*cptr[9].freq_high/8)*FIXEDPT*VIBFAC);
} else vibval2 = vibval_const;
if (cptr[0].tremolo) tremval1 = trem_lut; // tremolo enabled, use table
else tremval1 = tremval_const;
if (cptr[9].tremolo) tremval2 = trem_lut; // tremolo enabled, use table
else tremval2 = tremval_const;
// calculate channel output
for (i=0;i<endsamples;i++) {
// modulator
operator_advance(&cptr[0],vibval1[i]);
opfuncs[cptr[0].op_state](&cptr[0]);
operator_output(&cptr[0],(cptr[0].lastcval+cptr[0].cval)*cptr[0].mfbi/2,tremval1[i]);
// carrier
operator_advance(&cptr[9],vibval2[i]);
opfuncs[cptr[9].op_state](&cptr[9]);
operator_output(&cptr[9],cptr[0].cval*FIXEDPT,tremval2[i]);
Bit32s chanval = cptr[9].cval;
CHANVAL_OUT
}
}
}
#if defined(OPLTYPE_IS_OPL3)
if (adlibreg[0x105]&1) {
// convert to 16bit samples (stereo)
for (i=0;i<endsamples;i++) {
clipit16(outbufl[i], sndptr++, lvol);
clipit16(outbufr[i], sndptr++, rvol);
}
} else {
// convert to 16bit samples (mono)
for (i=0;i<endsamples;i++) {
clipit16(outbufl[i], sndptr++, lvol);
clipit16(outbufl[i], sndptr++, rvol);
}
}
#else
// convert to 16bit samples
for (i=0;i<endsamples;i++)
clipit16(outbufl[i], sndptr++, 0xff);
#endif
}
return opl_active;
}
void adlib_register_state(bx_list_c *parent)
{
int i;
char numstr[8];
bx_list_c *adlib = new bx_list_c(parent, "adlib");
new bx_shadow_num_c(adlib, "opl_index", &opl_index, BASE_HEX);
#if defined(OPLTYPE_IS_OPL3)
new bx_shadow_data_c(adlib, "regs", adlibreg, 512);
new bx_shadow_data_c(adlib, "wave_sel", wave_sel, 44, 1);
#endif
new bx_shadow_num_c(adlib, "vibtab_pos", &vibtab_pos);
new bx_shadow_num_c(adlib, "tremtab_pos", &tremtab_pos);
bx_list_c *ops = new bx_list_c(adlib, "op");
for (i = 0; i < MAXOPERATORS; i++) {
sprintf(numstr, "%d", i);
bx_list_c *opX = new bx_list_c(ops, numstr);
new bx_shadow_num_c(opX, "cval", &op[i].cval);
new bx_shadow_num_c(opX, "lastcval", &op[i].lastcval);
new bx_shadow_num_c(opX, "tcount", &op[i].tcount);
new bx_shadow_num_c(opX, "wfpos", &op[i].wfpos);
new bx_shadow_num_c(opX, "tinc", &op[i].tinc);
new bx_shadow_num_c(opX, "amp", &op[i].amp);
new bx_shadow_num_c(opX, "step_amp", &op[i].step_amp);
new bx_shadow_num_c(opX, "vol", &op[i].vol);
new bx_shadow_num_c(opX, "sustain_level", &op[i].sustain_level);
new bx_shadow_num_c(opX, "mfbi", &op[i].mfbi);
new bx_shadow_num_c(opX, "a0", &op[i].a0);
new bx_shadow_num_c(opX, "a1", &op[i].a1);
new bx_shadow_num_c(opX, "a2", &op[i].a2);
new bx_shadow_num_c(opX, "a3", &op[i].a3);
new bx_shadow_num_c(opX, "decaymul", &op[i].decaymul);
new bx_shadow_num_c(opX, "releasemul", &op[i].releasemul);
new bx_shadow_num_c(opX, "op_state", &op[i].op_state);
new bx_shadow_num_c(opX, "toff", &op[i].toff);
new bx_shadow_num_c(opX, "freq_high", &op[i].freq_high);
new bx_shadow_num_c(opX, "cur_wvsel", &op[i].cur_wvsel);
new bx_shadow_num_c(opX, "act_state", &op[i].act_state);
new bx_shadow_bool_c(opX, "sys_keep", &op[i].sus_keep);
new bx_shadow_bool_c(opX, "vibrato", &op[i].vibrato);
new bx_shadow_bool_c(opX, "tremolo", &op[i].tremolo);
new bx_shadow_num_c(opX, "generator_pos", &op[i].generator_pos);
new bx_shadow_num_c(opX, "cur_env_step", &op[i].cur_env_step);
new bx_shadow_num_c(opX, "env_step_a", &op[i].env_step_a);
new bx_shadow_num_c(opX, "env_step_d", &op[i].env_step_d);
new bx_shadow_num_c(opX, "env_step_r", &op[i].env_step_r);
new bx_shadow_num_c(opX, "step_skip_pos_a", &op[i].step_skip_pos_a);
new bx_shadow_num_c(opX, "env_step_skip_a", &op[i].env_step_skip_a);
#if defined(OPLTYPE_IS_OPL3)
new bx_shadow_bool_c(opX, "is_4op", &op[i].is_4op);
new bx_shadow_bool_c(opX, "is_4op_attached", &op[i].is_4op_attached);
new bx_shadow_num_c(opX, "left_pan", &op[i].left_pan);
new bx_shadow_num_c(opX, "right_pan", &op[i].right_pan);
#endif
}
}
void adlib_after_restore_state()
{
int i;
Bit8u wvsel;
for (i = 0; i < MAXOPERATORS; i++) {
wvsel = op[i].cur_wvsel;
op[i].cur_wmask = wavemask[wvsel];
op[i].cur_wform = &wavtable[waveform[wvsel]];
}
}
#endif
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