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/*
Fake86: A portable, open-source 8086 PC emulator.
Copyright (C)2010-2013 Mike Chambers
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/* adlib.c: very ugly Adlib OPL2 emulation for Fake86. very much a work in progress. :) */
#include "config.h"
#include <SDL/SDL.h>
#include <stdint.h>
#include <stdio.h>
extern void set_port_write_redirector (uint16_t startport, uint16_t endport, void *callback);
extern void set_port_read_redirector (uint16_t startport, uint16_t endport, void *callback);
extern int32_t usesamplerate;
double samprateadjust = 1.0;
uint8_t optable[0x16] = { 0, 0, 0, 1, 1, 1, 255, 255, 0, 0, 0, 1, 1, 1, 255, 255, 0, 0, 0, 1, 1, 1 };
uint16_t adlibregmem[0xFF], adlibaddr = 0;
int8_t waveform[4][64] = {
{ 1, 8, 13, 20, 26, 31, 37, 41, 47, 49, 54, 58, 58, 62, 63, 63, 64, 63, 62, 61, 58, 55, 52, 47, 45, 38, 34, 27, 23, 17, 10, 4,-2,-8,-15,-21,-26,-34,-36,-42,-48,-51,-54,-59,-60,-62,-64,-65,-65,-63,-64,-61,-59,-56,-53,-48,-46,-39,-36,-28,-24,-17,-11,-6 },
{ 1, 8, 13, 20, 25, 32, 36, 42, 46, 50, 54, 57, 60, 61, 62, 64, 63, 65, 61, 61, 58, 55, 51, 49, 44, 38, 34, 28, 23, 16, 11, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
{ 1, 8, 13, 21, 25, 31, 36, 43, 45, 50, 54, 57, 59, 62, 63, 63, 63, 64, 63, 59, 59, 55, 52, 48, 44, 38, 34, 28, 23, 16, 10, 4, 2, 7, 14, 20, 26, 31, 36, 42, 45, 51, 54, 56, 60, 62, 62, 63, 65, 63, 62, 60, 58, 55, 52, 48, 44, 38, 34, 28, 23, 17, 10, 3 },
{ 1, 8, 13, 20, 26, 31, 36, 42, 46, 51, 53, 57, 60, 62, 61, 66, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 13, 21, 25, 32, 36, 41, 47, 50, 54, 56, 60, 62, 61, 67, 15, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
};
int8_t oplwave[4][256] = {
{
0, 1, 3, 4, 6, 7, 9, 11, 12, 14, 15, 17, 18, 20, 22, 23, 24, 26, 27, 29, 30, 31, 33, 34, 36, 37, 38, 40, 40, 42, 43, 44, 46, 46, 48, 49, 50, 51, 51, 53,
53, 54, 55, 56, 57, 57, 58, 59, 59, 60, 61, 61, 62, 62, 63, 63, 63, 64, 64, 64, 116, 116, 116, 116, 116, 116, 116, 116, 116, 64, 64, 64, 63, 63, 63, 62, 62, 61, 61, 60,
59, 59, 58, 57, 57, 56, 55, 54, 53, 53, 51, 51, 50, 49, 48, 46, 46, 44, 43, 42, 40, 40, 38, 37, 36, 34, 33, 31, 30, 29, 27, 26, 24, 23, 22, 20, 18, 17, 15, 14,
12, 11, 9, 7, 6, 4, 3, 1, 0, -1, -3, -4, -6, -7, -9, -11, -12, -14, -15, -17, -18, -20, -22, -23, -24, -26, -27, -29, -30, -31, -33, -34, -36, -37, -38, -40, -40, -42, -43, -44,
-46, -46, -48, -49, -50, -51, -51, -53, -53, -54, -55, -56, -57, -57, -58, -59, -59, -60, -61, -61, -62, -62, -63, -63, -63, -64, -64, -64, -116, -116, -116, -116, -116, -116, -116, -116, -116, -64, -64, -64,
-63, -63, -63, -62, -62, -61, -61, -60, -59, -59, -58, -57, -57, -56, -55, -54, -53, -53, -51, -51, -50, -49, -48, -46, -46, -44, -43, -42, -40, -40, -38, -37, -36, -34, -33, -31, -30, -29, -27, -26,
-24, -23, -22, -20, -18, -17, -15, -14, -12, -11, -9, -7, -6, -4, -3, -1
},
{
0, 1, 3, 4, 6, 7, 9, 11, 12, 14, 15, 17, 18, 20, 22, 23, 24, 26, 27, 29,30, 31, 33, 34, 36, 37, 38, 40, 40, 42, 43, 44, 46, 46, 48, 49, 50, 51, 51, 53,
53, 54, 55, 56, 57, 57, 58, 59, 59, 60, 61, 61, 62, 62, 63, 63, 63, 64, 64, 64, 116, 116, 116, 116, 116, 116, 116, 116, 116, 64, 64, 64, 63, 63, 63, 62, 62, 61, 61, 60,
59, 59, 58, 57, 57, 56, 55, 54, 53, 53, 51, 51, 50, 49, 48, 46, 46, 44, 43, 42, 40, 40, 38, 37, 36, 34, 33, 31, 30, 29, 27, 26, 24, 23, 22, 20, 18, 17, 15, 14,
12, 11, 9, 7, 6, 4, 3, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
},
{
0, 1, 3, 4, 6, 7, 9, 11, 12, 14, 15, 17, 18, 20, 22, 23, 24, 26, 27, 29, 30, 31, 33, 34, 36, 37, 38, 40, 40, 42, 43, 44, 46, 46, 48, 49, 50, 51, 51, 53,
53, 54, 55, 56, 57, 57, 58, 59, 59, 60, 61, 61, 62, 62, 63, 63, 63, 64, 64, 64, 116, 116, 116, 116, 116, 116, 116, 116, 116, 64, 64, 64, 63, 63, 63, 62, 62, 61, 61, 60,
59, 59, 58, 57, 57, 56, 55, 54, 53, 53, 51, 51, 50, 49, 48, 46, 46, 44, 43, 42, 40, 40, 38, 37, 36, 34, 33, 31, 30, 29, 27, 26, 24, 23, 22, 20, 18, 17, 15, 14,
12, 11, 9, 7, 6, 4, 3, 1, 0, 1, 3, 4, 6, 7, 9, 11, 12, 14, 15, 17, 18, 20, 22, 23, 24, 26, 27, 29, 30, 31, 33, 34, 36, 37, 38, 40, 40, 42, 43, 44,
46, 46, 48, 49, 50, 51, 51, 53, 53, 54, 55, 56, 57, 57, 58, 59, 59, 60, 61, 61, 62, 62, 63, 63, 63, 64, 64, 64, 116, 116, 116, 116, 116, 116, 116, 116, 116, 64, 64, 64,
63, 63, 63, 62, 62, 61, 61, 60, 59, 59, 58, 57, 57, 56, 55, 54, 53, 53, 51, 51, 50, 49, 48, 46, 46, 44, 43, 42, 40, 40, 38, 37, 36, 34, 33, 31, 30, 29, 27, 26,
24, 23, 22, 20, 18, 17, 15, 14, 12, 11, 9, 7, 6, 4, 3, 1
},
{
0, 1, 3, 4, 6, 7, 9, 11, 12, 14, 15, 17, 18, 20, 22, 23, 24, 26, 27, 29, 30, 31, 33, 34, 36, 37, 38, 40, 40, 42, 43, 44, 46, 46, 48, 49, 50, 51, 51, 53,
53, 54, 55, 56, 57, 57, 58, 59, 59, 60, 61, 61, 62, 62, 63, 63, 63, 64, 64, 64, 116, 116, 116, 116, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 4, 6, 7, 9, 11, 12, 14, 15, 17, 18, 20, 22, 23, 24, 26, 27, 29, 30, 31, 33, 34, 36, 37, 38, 40, 40, 42, 43, 44,
46, 46, 48, 49, 50, 51, 51, 53, 53, 54, 55, 56, 57, 57, 58, 59, 59, 60, 61, 61, 62, 62, 63, 63, 63, 64, 64, 64, 116, 116, 116, 116, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
}
};
uint8_t oplstep[9] = { 0, 0, 0, 0, 0, 0, 0, 0, 0 };
struct structadlibop {
uint8_t wave;
} adlibop[9][2];
struct structadlibchan {
uint16_t freq;
double convfreq;
uint8_t keyon;
uint16_t octave;
uint8_t wavesel;
} adlibch[9];
double attacktable[16] = { 1.0003, 1.00025, 1.0002, 1.00015, 1.0001, 1.00009, 1.00008, 1.00007, 1.00006, 1.00005, 1.00004, 1.00003, 1.00002, 1.00001, 1.000005 }; //1.003, 1.05, 1.01, 1.015, 1.02, 1.025, 1.03, 1.035, 1.04, 1.045, 1.05, 1.055, 1.06, 1.065, 1.07, 1.075 };
double decaytable[16] = { 0.99999, 0.999985, 0.99998, 0.999975, 0.99997, 0.999965, 0.99996, 0.999955, 0.99995, 0.999945, 0.99994, 0.999935, 0.99994, 0.999925, 0.99992, 0.99991 };
double adlibenv[9], adlibdecay[9], adlibattack[9];
uint8_t adlibdidattack[9], adlibpercussion = 0, adlibstatus = 0;
uint16_t adlibport = 0x388;
void outadlib (uint16_t portnum, uint8_t value) {
if (portnum==adlibport) {
adlibaddr = value;
return;
}
portnum = adlibaddr;
adlibregmem[portnum] = value;
switch (portnum) {
case 4: //timer control
if (value&0x80) {
adlibstatus = 0;
adlibregmem[4] = 0;
}
break;
case 0xBD:
if (value & 0x10) adlibpercussion = 1;
else adlibpercussion = 0;
break;
}
if ( (portnum >= 0x60) && (portnum <= 0x75) ) { //attack/decay
portnum &= 15;
adlibattack[portnum] = attacktable[15- (value>>4) ]*1.006;
adlibdecay[portnum] = decaytable[value&15];
}
else if ( (portnum >= 0xA0) && (portnum <= 0xB8) ) { //octave, freq, key on
portnum &= 15;
if (!adlibch[portnum].keyon && ( (adlibregmem[0xB0+portnum]>>5) &1) ) {
adlibdidattack[portnum] = 0;
adlibenv[portnum] = 0.0025;
}
adlibch[portnum].freq = adlibregmem[0xA0+portnum] | ( (adlibregmem[0xB0+portnum]&3) <<8);
adlibch[portnum].convfreq = ( (double) adlibch[portnum].freq * 0.7626459);
adlibch[portnum].keyon = (adlibregmem[0xB0+portnum]>>5) &1;
adlibch[portnum].octave = (adlibregmem[0xB0+portnum]>>2) &7;
}
else if ( (portnum >= 0xE0) && (portnum <= 0xF5) ) { //waveform select
portnum &= 15;
if (portnum<9) adlibch[portnum].wavesel = value&3;
}
}
uint8_t inadlib (uint16_t portnum) {
if (!adlibregmem[4]) adlibstatus = 0;
else adlibstatus = 0x80;
adlibstatus = adlibstatus + (adlibregmem[4]&1) *0x40 + (adlibregmem[4]&2) *0x10;
return (adlibstatus);
}
uint16_t adlibfreq (uint8_t chan) {
uint16_t tmpfreq;
if (!adlibch[chan].keyon) return (0);
tmpfreq = (uint16_t) adlibch[chan].convfreq;
switch (adlibch[chan].octave) {
case 0:
tmpfreq = tmpfreq >> 4;
break;
case 1:
tmpfreq = tmpfreq >> 3;
break;
case 2:
tmpfreq = tmpfreq >> 2;
break;
case 3:
tmpfreq = tmpfreq >> 1;
break;
case 5:
tmpfreq = tmpfreq << 1;
break;
case 6:
tmpfreq = tmpfreq << 2;
break;
case 7:
tmpfreq = tmpfreq << 3;
}
return (tmpfreq);
}
uint64_t fullstep, adlibstep[9];
double adlibenv[9], adlibdecay[9], adlibattack[9];
uint8_t adlibdidattack[9];
extern SDL_AudioSpec wanted;
int32_t adlibsample (uint8_t curchan) {
int32_t tempsample;
double tempstep;
if (adlibpercussion && (curchan>=6) && (curchan<=8) ) return (0);
fullstep = usesamplerate/adlibfreq (curchan);
tempsample = (int32_t) oplwave[adlibch[curchan].wavesel][ (uint8_t) ( (double) adlibstep[curchan]/ ( (double) fullstep/ (double) 256) ) ];
tempstep = adlibenv[curchan];
if (tempstep>1.0) tempstep = 1;
tempsample = (int32_t) ( (double) tempsample * tempstep * 2.0);
adlibstep[curchan]++;
if (adlibstep[curchan]>fullstep) adlibstep[curchan] = 0;
return (tempsample);
}
int16_t adlibgensample() {
uint8_t curchan;
int16_t adlibaccum;
adlibaccum = 0;
for (curchan=0; curchan<9; curchan++) {
if (adlibfreq (curchan) !=0) {
adlibaccum += (int16_t) adlibsample (curchan);
}
}
return (adlibaccum);
}
void tickadlib() {
uint8_t curchan;
for (curchan=0; curchan<9; curchan++) {
if (adlibfreq (curchan) !=0) {
if (adlibdidattack[curchan]) {
adlibenv[curchan] *= adlibdecay[curchan];
}
else {
adlibenv[curchan] *= adlibattack[curchan];
if (adlibenv[curchan]>=1.0) adlibdidattack[curchan] = 1;
}
}
}
}
void initadlib (uint16_t baseport) {
set_port_write_redirector (baseport, baseport + 1, &outadlib);
set_port_read_redirector (baseport, baseport + 1, &inadlib);
}
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