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emu8950.c
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/**
* emu8950 v1.1.4
* https://github.com/digital-sound-antiques/emu8950
* Copyright (C) 2001-2020 Mitsutaka Okazaki
*/
#include "emu8950.h"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef INLINE
#if defined(_MSC_VER)
#define INLINE __inline
#elif defined(__GNUC__)
#define INLINE __inline__
#else
#define INLINE inline
#endif
#endif
#define _PI_ 3.14159265358979323846264338327950288
enum __OPL_EG_STATE { ATTACK, DECAY, SUSTAIN, RELEASE, UNKNOWN };
enum __OPL_TYPE { TYPE_Y8950 = 0, TYPE_YM3526, TYPE_YM3812, TYPE_MAX };
/* phase increment counter */
#define DP_BITS 20
#define DP_WIDTH (1 << DP_BITS)
#define DP_BASE_BITS (DP_BITS - PG_BITS)
/* dynamic range of envelope output */
#define EG_STEP 0.1875
#define EG_BITS 9
#define EG_MUTE ((1 << EG_BITS) - 1)
#define EG_MAX (0x1f0) // 93dB
/* dynamic range of total level */
#define TL_STEP 0.75
#define TL_BITS 6
/* dynamic range of sustine level */
#define SL_STEP 3.0
#define SL_BITS 4
#define TL2EG(tl) ((tl) << 2)
/* sine table */
#define PG_BITS 10 /* 2^10 = 1024 length sine table */
#define PG_WIDTH (1 << PG_BITS)
/* clang-format off */
/* exp_table[x] = round((exp2((double)x / 256.0) - 1) * 1024) */
static uint16_t exp_table[256] = {
0, 3, 6, 8, 11, 14, 17, 20, 22, 25, 28, 31, 34, 37, 40, 42,
45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90,
93, 96, 99, 102, 105, 108, 111, 114, 117, 120, 123, 126, 130, 133, 136, 139,
142, 145, 148, 152, 155, 158, 161, 164, 168, 171, 174, 177, 181, 184, 187, 190,
194, 197, 200, 204, 207, 210, 214, 217, 220, 224, 227, 231, 234, 237, 241, 244,
248, 251, 255, 258, 262, 265, 268, 272, 276, 279, 283, 286, 290, 293, 297, 300,
304, 308, 311, 315, 318, 322, 326, 329, 333, 337, 340, 344, 348, 352, 355, 359,
363, 367, 370, 374, 378, 382, 385, 389, 393, 397, 401, 405, 409, 412, 416, 420,
424, 428, 432, 436, 440, 444, 448, 452, 456, 460, 464, 468, 472, 476, 480, 484,
488, 492, 496, 501, 505, 509, 513, 517, 521, 526, 530, 534, 538, 542, 547, 551,
555, 560, 564, 568, 572, 577, 581, 585, 590, 594, 599, 603, 607, 612, 616, 621,
625, 630, 634, 639, 643, 648, 652, 657, 661, 666, 670, 675, 680, 684, 689, 693,
698, 703, 708, 712, 717, 722, 726, 731, 736, 741, 745, 750, 755, 760, 765, 770,
774, 779, 784, 789, 794, 799, 804, 809, 814, 819, 824, 829, 834, 839, 844, 849,
854, 859, 864, 869, 874, 880, 885, 890, 895, 900, 906, 911, 916, 921, 927, 932,
937, 942, 948, 953, 959, 964, 969, 975, 980, 986, 991, 996, 1002, 1007, 1013, 1018
};
/* logsin_table[x] = round(-log2(sin((x + 0.5) * PI / (PG_WIDTH / 4) / 2)) * 256) */
static uint16_t logsin_table[PG_WIDTH / 4] = {
2137, 1731, 1543, 1419, 1326, 1252, 1190, 1137, 1091, 1050, 1013, 979, 949, 920, 894, 869,
846, 825, 804, 785, 767, 749, 732, 717, 701, 687, 672, 659, 646, 633, 621, 609,
598, 587, 576, 566, 556, 546, 536, 527, 518, 509, 501, 492, 484, 476, 468, 461,
453, 446, 439, 432, 425, 418, 411, 405, 399, 392, 386, 380, 375, 369, 363, 358,
352, 347, 341, 336, 331, 326, 321, 316, 311, 307, 302, 297, 293, 289, 284, 280,
276, 271, 267, 263, 259, 255, 251, 248, 244, 240, 236, 233, 229, 226, 222, 219,
215, 212, 209, 205, 202, 199, 196, 193, 190, 187, 184, 181, 178, 175, 172, 169,
167, 164, 161, 159, 156, 153, 151, 148, 146, 143, 141, 138, 136, 134, 131, 129,
127, 125, 122, 120, 118, 116, 114, 112, 110, 108, 106, 104, 102, 100, 98, 96,
94, 92, 91, 89, 87, 85, 83, 82, 80, 78, 77, 75, 74, 72, 70, 69,
67, 66, 64, 63, 62, 60, 59, 57, 56, 55, 53, 52, 51, 49, 48, 47,
46, 45, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30,
29, 28, 27, 26, 25, 24, 23, 23, 22, 21, 20, 20, 19, 18, 17, 17,
16, 15, 15, 14, 13, 13, 12, 12, 11, 10, 10, 9, 9, 8, 8, 7,
7, 7, 6, 6, 5, 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2,
2, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
};
/* clang-format on */
static uint16_t wave_table_map[4][PG_WIDTH];
/* pitch modulator */
#define PM_PG_BITS 3
#define PM_PG_WIDTH (1 << PM_PG_BITS)
#define PM_DP_BITS 22
#define PM_DP_WIDTH (1 << PM_DP_BITS)
/* offset to fnum, rough approximation of 14 cents depth. */
static int8_t pm_table[8][PM_PG_WIDTH] = {
{0, 0, 0, 0, 0, 0, 0, 0}, // fnum = 000xxxxx
{0, 0, 1, 0, 0, 0, -1, 0}, // fnum = 001xxxxx
{0, 1, 2, 1, 0, -1, -2, -1}, // fnum = 010xxxxx
{0, 1, 3, 1, 0, -1, -3, -1}, // fnum = 011xxxxx
{0, 2, 4, 2, 0, -2, -4, -2}, // fnum = 100xxxxx
{0, 2, 5, 2, 0, -2, -5, -2}, // fnum = 101xxxxx
{0, 3, 6, 3, 0, -3, -6, -3}, // fnum = 110xxxxx
{0, 3, 7, 3, 0, -3, -7, -3}, // fnum = 111xxxxx
};
/* amplitude lfo table */
/* The following envelop pattern is verified on real YM2413. */
/* each element repeates 64 cycles */
static uint8_t am_table[210] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, //
2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, //
4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, //
6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, //
8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, //
10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, //
12, 12, 12, 12, 12, 12, 12, 12, //
13, 13, 13, //
12, 12, 12, 12, 12, 12, 12, 12, //
11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, //
9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, //
7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, //
5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, //
3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, //
1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0};
/* envelope decay increment step table */
static uint8_t eg_step_tables[4][8] = {
{0, 1, 0, 1, 0, 1, 0, 1},
{0, 1, 0, 1, 1, 1, 0, 1},
{0, 1, 1, 1, 0, 1, 1, 1},
{0, 1, 1, 1, 1, 1, 1, 1},
};
static uint8_t eg_step_tables_fast[4][8] = {
{1, 1, 1, 1, 1, 1, 1, 1},
{1, 1, 1, 2, 1, 1, 1, 2},
{1, 2, 1, 2, 1, 2, 1, 2},
{1, 2, 2, 2, 1, 2, 2, 2},
};
static uint32_t ml_table[16] = {1, 1 * 2, 2 * 2, 3 * 2, 4 * 2, 5 * 2, 6 * 2, 7 * 2,
8 * 2, 9 * 2, 10 * 2, 10 * 2, 12 * 2, 12 * 2, 15 * 2, 15 * 2};
#define dB2(x) ((x) * 2)
static double kl_table[16] = {dB2(0.000), dB2(9.000), dB2(12.000), dB2(13.875), dB2(15.000), dB2(16.125),
dB2(16.875), dB2(17.625), dB2(18.000), dB2(18.750), dB2(19.125), dB2(19.500),
dB2(19.875), dB2(20.250), dB2(20.625), dB2(21.000)};
static uint32_t tll_table[8 * 16][1 << TL_BITS][4];
static int32_t rks_table[2][32][2];
#define min(i, j) (((i) < (j)) ? (i) : (j))
#define max(i, j) (((i) > (j)) ? (i) : (j))
/***************************************************
Internal Sample Rate Converter
****************************************************/
/* Note: to disable internal rate converter, set clock/72 to output sampling rate. */
/*
* LW is truncate length of sinc(x) calculation.
* Lower LW is faster, higher LW results better quality.
* LW must be a non-zero positive even number, no upper limit.
* LW=16 or greater is recommended when upsampling.
* LW=8 is practically okay for downsampling.
*/
#define LW 16
/* resolution of sinc(x) table. sinc(x) where 0.0<=x<1.0 corresponds to sinc_table[0...SINC_RESO-1] */
#define SINC_RESO 256
#define SINC_AMP_BITS 12
// double hamming(double x) { return 0.54 - 0.46 * cos(2 * PI * x); }
static double blackman(double x) { return 0.42 - 0.5 * cos(2 * _PI_ * x) + 0.08 * cos(4 * _PI_ * x); }
static double sinc(double x) { return (x == 0.0 ? 1.0 : sin(_PI_ * x) / (_PI_ * x)); }
static double windowed_sinc(double x) { return blackman(0.5 + 0.5 * x / (LW / 2)) * sinc(x); }
/* f_inp: input frequency. f_out: output frequencey, ch: number of channels */
OPL_RateConv *OPL_RateConv_new(double f_inp, double f_out, int ch) {
OPL_RateConv *conv = malloc(sizeof(OPL_RateConv));
int i;
conv->ch = ch;
conv->f_ratio = f_inp / f_out;
conv->buf = malloc(sizeof(void *) * ch);
for (i = 0; i < ch; i++) {
conv->buf[i] = malloc(sizeof(conv->buf[0][0]) * LW);
}
/* create sinc_table for positive 0 <= x < LW/2 */
conv->sinc_table = malloc(sizeof(conv->sinc_table[0]) * SINC_RESO * LW / 2);
for (i = 0; i < SINC_RESO * LW / 2; i++) {
const double x = (double)i / SINC_RESO;
if (f_out < f_inp) {
/* for downsampling */
conv->sinc_table[i] = (int16_t)((1 << SINC_AMP_BITS) * windowed_sinc(x / conv->f_ratio) / conv->f_ratio);
} else {
/* for upsampling */
conv->sinc_table[i] = (int16_t)((1 << SINC_AMP_BITS) * windowed_sinc(x));
}
}
return conv;
}
static INLINE int16_t lookup_sinc_table(int16_t *table, double x) {
int16_t index = (int16_t)(x * SINC_RESO);
if (index < 0)
index = -index;
return table[min(SINC_RESO * LW / 2 - 1, index)];
}
void OPL_RateConv_reset(OPL_RateConv *conv) {
int i;
conv->timer = 0;
for (i = 0; i < conv->ch; i++) {
memset(conv->buf[i], 0, sizeof(conv->buf[i][0]) * LW);
}
}
/* put original data to this converter at f_inp. */
void OPL_RateConv_putData(OPL_RateConv *conv, int ch, int16_t data) {
int16_t *buf = conv->buf[ch];
int i;
for (i = 0; i < LW - 1; i++) {
buf[i] = buf[i + 1];
}
buf[LW - 1] = data;
}
/* get resampled data from this converter at f_out. */
/* this function must be called f_out / f_inp times per one putData call. */
int16_t OPL_RateConv_getData(OPL_RateConv *conv, int ch) {
int16_t *buf = conv->buf[ch];
int32_t sum = 0;
int k;
double dn;
conv->timer += conv->f_ratio;
dn = conv->timer - floor(conv->timer);
conv->timer = dn;
for (k = 0; k < LW; k++) {
double x = ((double)k - (LW / 2 - 1)) - dn;
sum += buf[k] * lookup_sinc_table(conv->sinc_table, x);
}
return sum >> SINC_AMP_BITS;
}
void OPL_RateConv_delete(OPL_RateConv *conv) {
int i;
for (i = 0; i < conv->ch; i++) {
free(conv->buf[i]);
}
free(conv->buf);
free(conv->sinc_table);
free(conv);
}
/***************************************************
Create tables
****************************************************/
static void makeSinTable(void) {
int x;
for (x = 0; x < PG_WIDTH; x++) {
if (x < PG_WIDTH / 4) {
wave_table_map[0][x] = logsin_table[x];
} else if (x < PG_WIDTH / 2) {
wave_table_map[0][x] = logsin_table[PG_WIDTH / 2 - x - 1];
} else {
wave_table_map[0][x] = 0x8000 | wave_table_map[0][PG_WIDTH - x - 1];
}
}
for (x = 0; x < PG_WIDTH; x++) {
if (x < PG_WIDTH / 2) {
wave_table_map[1][x] = wave_table_map[0][x];
} else {
wave_table_map[1][x] = 0xfff;
}
}
for (x = 0; x < PG_WIDTH; x++) {
if (x < PG_WIDTH / 2) {
wave_table_map[2][x] = wave_table_map[0][x];
} else {
wave_table_map[2][x] = wave_table_map[0][x - PG_WIDTH / 2];
}
}
for (x = 0; x < PG_WIDTH; x++) {
if (x < PG_WIDTH / 4) {
wave_table_map[3][x] = wave_table_map[0][x];
} else if (x < PG_WIDTH / 2) {
wave_table_map[3][x] = 0xfff;
} else if (x < PG_WIDTH * 3 / 4) {
wave_table_map[3][x] = wave_table_map[0][x - PG_WIDTH / 2];
} else {
wave_table_map[3][x] = 0xfff;
}
}
}
static void makeTllTable(void) {
int32_t tmp;
int32_t fnum, block, TL, KL, kx;
for (fnum = 0; fnum < 16; fnum++) {
for (block = 0; block < 8; block++) {
for (TL = 0; TL < 64; TL++) {
for (KL = 0; KL < 4; KL++) {
kx = ((KL & 1) << 1) | ((KL >> 1) & 1);
if (KL == 0) {
tll_table[(block << 4) | fnum][TL][KL] = TL2EG(TL);
} else {
tmp = (int32_t)(kl_table[fnum] - dB2(3.000) * (7 - block));
if (tmp <= 0)
tll_table[(block << 4) | fnum][TL][KL] = TL2EG(TL);
else
tll_table[(block << 4) | fnum][TL][KL] = (uint32_t)((tmp >> (3 - kx)) / EG_STEP) + TL2EG(TL);
}
}
}
}
}
}
static void makeRksTable(void) {
int fnum8, fnum9, blk;
int blk_fnum98;
for (fnum8 = 0; fnum8 < 2; fnum8++)
for (fnum9 = 0; fnum9 < 2; fnum9++)
for (blk = 0; blk < 8; blk++) {
blk_fnum98 = (blk << 2) | (fnum9 << 1) | fnum8;
rks_table[0][blk_fnum98][1] = (blk << 1) + fnum9;
rks_table[0][blk_fnum98][0] = blk >> 1;
rks_table[1][blk_fnum98][1] = (blk << 1) + (fnum9 & fnum8);
rks_table[1][blk_fnum98][0] = blk >> 1;
}
}
static uint8_t table_initialized = 0;
static void initializeTables() {
makeTllTable();
makeRksTable();
makeSinTable();
table_initialized = 1;
}
/*********************************************************
Synthesizing
*********************************************************/
#define SLOT_BD1 12
#define SLOT_BD2 13
#define SLOT_HH 14
#define SLOT_SD 15
#define SLOT_TOM 16
#define SLOT_CYM 17
/* utility macros */
#define MOD(o, x) (&(o)->slot[(x) << 1])
#define CAR(o, x) (&(o)->slot[((x) << 1) | 1])
#define BIT(s, b) (((s) >> (b)) & 1)
#if OPL_DEBUG
static void _debug_print_patch(OPL_SLOT *slot) {
OPL_PATCH *p = slot->patch;
printf("[slot#%d am:%d pm:%d eg:%d kr:%d ml:%d kl:%d tl:%d ws:%d fb:%d A:%d D:%d S:%d R:%d]\n", slot->number, //
p->AM, p->PM, p->EG, p->KR, p->ML, //
p->KL, p->TL, p->WS, p->FB, //
p->AR, p->DR, p->SL, p->RR);
}
static char *_debug_eg_state_name(OPL_SLOT *slot) {
switch (slot->eg_state) {
case ATTACK:
return "attack";
case DECAY:
return "decay";
case SUSTAIN:
return "sustain";
case RELEASE:
return "release";
default:
return "unknown";
}
}
static INLINE void _debug_print_slot_info(OPL_SLOT *slot) {
char *name = _debug_eg_state_name(slot);
_debug_print_patch(slot);
printf("[slot#%d state:%s fnum:%03x rate:%d-%d]\n", slot->number, name, slot->blk_fnum, slot->eg_rate_h,
slot->eg_rate_l);
fflush(stdout);
}
#endif
static INLINE int get_parameter_rate(OPL_SLOT *slot) {
switch (slot->eg_state) {
case ATTACK:
return slot->patch->AR;
case DECAY:
return slot->patch->DR;
case SUSTAIN:
return slot->patch->EG ? 0 : slot->patch->RR;
case RELEASE:
return slot->patch->RR;
default:
return 0;
}
}
enum SLOT_UPDATE_FLAG {
UPDATE_WS = 1,
UPDATE_TLL = 2,
UPDATE_RKS = 4,
UPDATE_EG = 8,
UPDATE_ALL = 255,
};
static INLINE void request_update(OPL_SLOT *slot, int flag) { slot->update_requests |= flag; }
static void commit_slot_update(OPL_SLOT *slot, uint8_t notesel) {
if (slot->update_requests & UPDATE_WS) {
slot->wave_table = wave_table_map[slot->patch->WS & 3];
}
if (slot->update_requests & UPDATE_TLL) {
if ((slot->type & 1) == 0) {
slot->tll = tll_table[slot->blk_fnum >> 6][slot->patch->TL][slot->patch->KL];
} else {
slot->tll = tll_table[slot->blk_fnum >> 6][slot->patch->TL][slot->patch->KL];
}
}
if (slot->update_requests & UPDATE_RKS) {
slot->rks = rks_table[notesel][slot->blk_fnum >> 8][slot->patch->KR];
}
if (slot->update_requests & (UPDATE_RKS | UPDATE_EG)) {
int p_rate = get_parameter_rate(slot);
if (p_rate == 0) {
slot->eg_shift = 0;
slot->eg_rate_h = 0;
slot->eg_rate_l = 0;
} else {
slot->eg_rate_h = min(15, p_rate + (slot->rks >> 2));
slot->eg_rate_l = slot->rks & 3;
if (slot->eg_state == ATTACK) {
slot->eg_shift = (0 < slot->eg_rate_h && slot->eg_rate_h < 12) ? (12 - slot->eg_rate_h) : 0;
} else {
slot->eg_shift = (slot->eg_rate_h < 12) ? (12 - slot->eg_rate_h) : 0;
}
}
}
#if OPL_DEBUG
if (slot->last_eg_state != slot->eg_state) {
_debug_print_slot_info(slot);
slot->last_eg_state = slot->eg_state;
}
#endif
slot->update_requests = 0;
}
static void reset_slot(OPL_SLOT *slot, int number) {
slot->patch = &(slot->__patch);
memset(slot->patch, 0, sizeof(OPL_PATCH));
slot->number = number;
slot->type = number % 2;
slot->pg_keep = 0;
slot->wave_table = wave_table_map[0];
slot->pg_phase = 0;
slot->output[0] = 0;
slot->output[1] = 0;
slot->eg_state = RELEASE;
slot->eg_shift = 0;
slot->rks = 0;
slot->tll = 0;
slot->blk_fnum = 0;
slot->blk = 0;
slot->fnum = 0;
slot->pg_out = 0;
slot->eg_out = EG_MUTE;
}
static INLINE void slotOn(OPL *opl, int i) {
OPL_SLOT *slot = &opl->slot[i];
slot->rks = rks_table[opl->notesel][slot->blk_fnum >> 8][slot->patch->KR];
if (min(15, slot->patch->AR + (slot->rks >> 2)) == 15) {
slot->eg_state = DECAY;
slot->eg_out = 0;
} else {
slot->eg_state = ATTACK;
}
if (!slot->pg_keep) {
slot->pg_phase = 0;
}
request_update(slot, UPDATE_EG);
}
static INLINE void slotOff(OPL *opl, int i) {
OPL_SLOT *slot = &opl->slot[i];
slot->eg_state = RELEASE;
request_update(slot, UPDATE_EG);
}
static INLINE void update_key_status(OPL *opl) {
const uint8_t r14 = opl->reg[0xbd];
const uint8_t rhythm_mode = BIT(r14, 5);
uint32_t new_slot_key_status = 0;
uint32_t updated_status;
int ch;
if (opl->csm_mode && opl->csm_key_count) {
new_slot_key_status = 0x3ffff;
}
for (ch = 0; ch < 9; ch++)
if (opl->reg[0xB0 + ch] & 0x20)
new_slot_key_status |= 3 << (ch * 2);
if (rhythm_mode) {
if (r14 & 0x10)
new_slot_key_status |= 3 << SLOT_BD1;
if (r14 & 0x01)
new_slot_key_status |= 1 << SLOT_HH;
if (r14 & 0x08)
new_slot_key_status |= 1 << SLOT_SD;
if (r14 & 0x04)
new_slot_key_status |= 1 << SLOT_TOM;
if (r14 & 0x02)
new_slot_key_status |= 1 << SLOT_CYM;
}
updated_status = opl->slot_key_status ^ new_slot_key_status;
if (updated_status) {
int i;
for (i = 0; i < 18; i++)
if (BIT(updated_status, i)) {
if (BIT(new_slot_key_status, i)) {
slotOn(opl, i);
} else {
slotOff(opl, i);
}
}
}
opl->slot_key_status = new_slot_key_status;
}
/* set f-Nnmber ( fnum : 10bit ) */
static INLINE void set_fnumber(OPL *opl, int ch, int fnum) {
OPL_SLOT *car = CAR(opl, ch);
OPL_SLOT *mod = MOD(opl, ch);
car->fnum = fnum;
car->blk_fnum = (car->blk_fnum & 0x1c00) | (fnum & 0x3ff);
mod->fnum = fnum;
mod->blk_fnum = (mod->blk_fnum & 0x1c00) | (fnum & 0x3ff);
request_update(car, UPDATE_EG | UPDATE_RKS | UPDATE_TLL);
request_update(mod, UPDATE_EG | UPDATE_RKS | UPDATE_TLL);
}
/* set block data (blk : 3bit ) */
static INLINE void set_block(OPL *opl, int ch, int blk) {
OPL_SLOT *car = CAR(opl, ch);
OPL_SLOT *mod = MOD(opl, ch);
car->blk = blk;
car->blk_fnum = ((blk & 7) << 10) | (car->blk_fnum & 0x3ff);
mod->blk = blk;
mod->blk_fnum = ((blk & 7) << 10) | (mod->blk_fnum & 0x3ff);
request_update(car, UPDATE_EG | UPDATE_RKS | UPDATE_TLL);
request_update(mod, UPDATE_EG | UPDATE_RKS | UPDATE_TLL);
}
static INLINE void update_rhythm_mode(OPL *opl) {
const uint8_t new_rhythm_mode = (opl->reg[0xbd] >> 5) & 1;
if (opl->rhythm_mode != new_rhythm_mode) {
if (new_rhythm_mode) {
opl->slot[SLOT_HH].type = 3;
opl->slot[SLOT_HH].pg_keep = 1;
opl->slot[SLOT_SD].type = 3;
opl->slot[SLOT_TOM].type = 3;
opl->slot[SLOT_CYM].type = 3;
opl->slot[SLOT_CYM].pg_keep = 1;
} else {
opl->slot[SLOT_HH].type = 0;
opl->slot[SLOT_HH].pg_keep = 0;
opl->slot[SLOT_SD].type = 1;
opl->slot[SLOT_TOM].type = 0;
opl->slot[SLOT_CYM].type = 1;
opl->slot[SLOT_CYM].pg_keep = 0;
}
}
opl->rhythm_mode = new_rhythm_mode;
}
static void update_ampm(OPL *opl) {
const uint32_t pm_inc = (opl->test_flag & 8) ? opl->pm_dphase << 10 : opl->pm_dphase;
const uint32_t am_inc = (opl->test_flag & 8) ? 64 : 1;
if (opl->test_flag & 2) {
opl->pm_phase = 0;
opl->am_phase = 0;
} else {
opl->pm_phase = (opl->pm_phase + pm_inc) & (PM_DP_WIDTH - 1);
opl->am_phase += am_inc;
}
opl->lfo_am = am_table[(opl->am_phase >> 6) % sizeof(am_table)] >> (opl->am_mode ? 0 : 2);
}
static void update_noise(OPL *opl, int cycle) {
int i;
for (i = 0; i < cycle; i++) {
if (opl->noise & 1) {
opl->noise ^= 0x800200;
}
opl->noise >>= 1;
}
}
static void update_short_noise(OPL *opl) {
const uint32_t pg_hh = opl->slot[SLOT_HH].pg_out;
const uint32_t pg_cym = opl->slot[SLOT_CYM].pg_out;
const uint8_t h_bit2 = BIT(pg_hh, PG_BITS - 8);
const uint8_t h_bit7 = BIT(pg_hh, PG_BITS - 3);
const uint8_t h_bit3 = BIT(pg_hh, PG_BITS - 7);
const uint8_t c_bit3 = BIT(pg_cym, PG_BITS - 7);
const uint8_t c_bit5 = BIT(pg_cym, PG_BITS - 5);
opl->short_noise = (h_bit2 ^ h_bit7) | (h_bit3 ^ c_bit5) | (c_bit3 ^ c_bit5);
}
static INLINE void calc_phase(OPL_SLOT *slot, int32_t pm_phase, uint8_t pm_mode, uint8_t reset) {
int8_t pm = 0;
if (slot->patch->PM) {
pm = pm_table[(slot->fnum >> 7) & 7][pm_phase >> (PM_DP_BITS - PM_PG_BITS)];
pm >>= (pm_mode ? 0 : 1);
}
if (reset) {
slot->pg_phase = 0;
}
slot->pg_phase += (((slot->fnum & 0x3ff) + pm) * ml_table[slot->patch->ML]) << slot->blk >> 1;
slot->pg_phase &= (DP_WIDTH - 1);
slot->pg_out = slot->pg_phase >> DP_BASE_BITS;
}
static INLINE uint8_t lookup_attack_step(OPL_SLOT *slot, uint32_t counter) {
int index = (counter >> slot->eg_shift) & 7;
switch (slot->eg_rate_h) {
case 13:
return eg_step_tables_fast[slot->eg_rate_l][index];
case 14:
return eg_step_tables_fast[slot->eg_rate_l][index] << 1;
case 0:
case 15:
return 0;
default:
return eg_step_tables[slot->eg_rate_l][index];
}
}
static INLINE uint8_t lookup_decay_step(OPL_SLOT *slot, uint32_t counter) {
int index = (counter >> slot->eg_shift) & 7;
switch (slot->eg_rate_h) {
case 0:
return 0;
case 13:
return eg_step_tables_fast[slot->eg_rate_l][index];
case 14:
return eg_step_tables_fast[slot->eg_rate_l][index] << 1;
case 15:
return 4;
default:
return eg_step_tables[slot->eg_rate_l][index];
}
}
static INLINE void calc_envelope(OPL_SLOT *slot, uint16_t eg_counter, uint8_t test) {
uint16_t mask = (1 << slot->eg_shift) - 1;
uint8_t s;
if (slot->eg_state == ATTACK) {
if (0 < slot->eg_out && slot->eg_rate_h > 0 && (eg_counter & mask) == 0) {
s = lookup_attack_step(slot, eg_counter);
slot->eg_out += (~slot->eg_out * s) >> 3;
}
} else {
if (slot->eg_rate_h > 0 && (eg_counter & mask) == 0) {
slot->eg_out = min(EG_MUTE, slot->eg_out + lookup_decay_step(slot, eg_counter));
}
}
switch (slot->eg_state) {
case ATTACK:
if (slot->eg_out == 0) {
slot->eg_state = DECAY;
request_update(slot, UPDATE_EG);
}
break;
case DECAY:
if ((slot->patch->SL != 15) && (slot->eg_out >> 4) == slot->patch->SL) {
slot->eg_state = SUSTAIN;
request_update(slot, UPDATE_EG);
}
break;
case SUSTAIN:
case RELEASE:
default:
break;
}
if (test) {
slot->eg_out = 0;
}
}
static void update_slots(OPL *opl) {
int i;
opl->eg_counter++;
for (i = 0; i < 18; i++) {
OPL_SLOT *slot = &opl->slot[i];
if (slot->update_requests) {
commit_slot_update(slot, opl->notesel);
}
calc_envelope(slot, opl->eg_counter, opl->test_flag & 1);
calc_phase(slot, opl->pm_phase, opl->pm_mode, opl->test_flag & 4);
}
}
/* input: 0..8191 output: -4095..4095 */
static INLINE int16_t lookup_exp_table(uint16_t i) {
/* from andete's expressoin */
int16_t t = (exp_table[(i & 0xff) ^ 0xff] + 1024);
int16_t res = t >> ((i & 0x7f00) >> 8);
return ((i & 0x8000) ? ~res : res) << 1;
}
static INLINE int16_t to_linear(uint16_t h, OPL_SLOT *slot, int16_t am) {
uint16_t att;
if (slot->eg_out >= EG_MAX)
return 0;
att = min(EG_MUTE, (slot->eg_out + slot->tll + am)) << 3;
return lookup_exp_table(h + att);
}
static INLINE int16_t calc_slot_car(OPL *opl, int ch, int16_t fm) {
OPL_SLOT *slot = CAR(opl, ch);
uint8_t am = slot->patch->AM ? opl->lfo_am : 0;
slot->output[1] = slot->output[0];
slot->output[0] = to_linear(slot->wave_table[(slot->pg_out + 2 * (fm >> 1)) & (PG_WIDTH - 1)], slot, am);
return slot->output[0];
}
static INLINE int16_t calc_slot_mod(OPL *opl, int ch) {
OPL_SLOT *slot = MOD(opl, ch);
int16_t fm = slot->patch->FB > 0 ? (slot->output[1] + slot->output[0]) >> (9 - slot->patch->FB) : 0;
uint8_t am = slot->patch->AM ? opl->lfo_am : 0;
slot->output[1] = slot->output[0];
slot->output[0] = to_linear(slot->wave_table[(slot->pg_out + fm) & (PG_WIDTH - 1)], slot, am);
return slot->output[0];
}
static INLINE int16_t calc_slot_tom(OPL *opl) {
OPL_SLOT *slot = &(opl->slot[SLOT_TOM]);
return to_linear(slot->wave_table[slot->pg_out], slot, 0);
}
/* Specify phase offset directly based on 10-bit (1024-length) sine table */
#define _PD(phase) ((PG_BITS < 10) ? (phase >> (10 - PG_BITS)) : (phase << (PG_BITS - 10)))
static INLINE int16_t calc_slot_snare(OPL *opl) {
OPL_SLOT *slot = &(opl->slot[SLOT_SD]);
uint32_t phase;
if (BIT(opl->slot[SLOT_HH].pg_out, PG_BITS - 2))
phase = (opl->noise & 1) ? _PD(0x300) : _PD(0x200);
else
phase = (opl->noise & 1) ? _PD(0x0) : _PD(0x100);
return to_linear(slot->wave_table[phase], slot, 0);
}
static INLINE int16_t calc_slot_cym(OPL *opl) {
OPL_SLOT *slot = &(opl->slot[SLOT_CYM]);
uint32_t phase = opl->short_noise ? _PD(0x300) : _PD(0x100);
return to_linear(slot->wave_table[phase], slot, 0);
}
static INLINE int16_t calc_slot_hat(OPL *opl) {
OPL_SLOT *slot = &(opl->slot[SLOT_HH]);
uint32_t phase;
if (opl->short_noise)
phase = (opl->noise & 1) ? _PD(0x2d0) : _PD(0x234);
else
phase = (opl->noise & 1) ? _PD(0x34) : _PD(0xd0);
return to_linear(slot->wave_table[phase], slot, 0);
}
#define _MO(x) (-(x) >> 1)
#define _RO(x) (x)
static INLINE int16_t calc_fm(OPL *opl, int ch) {
if (opl->ch_alg[ch]) {
return calc_slot_car(opl, ch, 0) + calc_slot_mod(opl, ch);
}
return calc_slot_car(opl, ch, calc_slot_mod(opl, ch));
}
static void latch_timer1(OPL *opl) { opl->timer1_counter = opl->reg[0x02] << 2; }
static void latch_timer2(OPL *opl) { opl->timer2_counter = opl->reg[0x03] << 4; }
static void csm_key_on(OPL *opl) {
opl->csm_key_count = 1;
update_key_status(opl);
}
static void csm_key_off(OPL *opl) {
opl->csm_key_count = 0;
update_key_status(opl);
}
static void update_timer(OPL *opl) {
if (opl->csm_mode && 0 < opl->csm_key_count) {
csm_key_off(opl);
}
if (opl->reg[0x04] & 0x01) {
opl->timer1_counter++;
if (opl->timer1_counter >> 10) {
opl->status |= 0x40; // timer1 overflow
if (opl->csm_mode) {
csm_key_on(opl);
}
if (opl->timer1_func) {
opl->timer1_func(opl->timer1_user_data);
}
latch_timer1(opl);
}
}
if (opl->reg[0x04] & 0x02) {
opl->timer2_counter++;
if (opl->timer2_counter >> 12) {
opl->status |= 0x20; // timer2 overflow
if (opl->timer2_func) {
opl->timer2_func(opl->timer2_user_data);
}
latch_timer2(opl);
}
}
}
static void update_output(OPL *opl) {
int16_t *out;
int i;
update_timer(opl);
update_ampm(opl);
update_short_noise(opl);
update_slots(opl);
out = opl->ch_out;
/* CH1-6 */
for (i = 0; i < 6; i++) {
if (!(opl->mask & OPL_MASK_CH(i))) {
out[i] = _MO(calc_fm(opl, i));
}
}
/* CH7 */
if (!opl->rhythm_mode) {
if (!(opl->mask & OPL_MASK_CH(6))) {
out[6] = _MO(calc_fm(opl, 6));
}
} else {
if (!(opl->mask & OPL_MASK_BD)) {
out[9] = _RO(calc_fm(opl, 6));
}
}
update_noise(opl, 14);
/* CH8 */
if (!opl->rhythm_mode) {
if (!(opl->mask & OPL_MASK_CH(7))) {
out[7] = _MO(calc_fm(opl, 7));
}
} else {
if (!(opl->mask & OPL_MASK_HH)) {
out[10] = _RO(calc_slot_hat(opl));
}
if (!(opl->mask & OPL_MASK_SD)) {
out[11] = _RO(calc_slot_snare(opl));
}
}
update_noise(opl, 2);
/* CH9 */
if (!opl->rhythm_mode) {
if (!(opl->mask & OPL_MASK_CH(8))) {
out[8] = _MO(calc_fm(opl, 8));
}
} else {
if (!(opl->mask & OPL_MASK_TOM)) {
out[12] = _RO(calc_slot_tom(opl));
}
if (!(opl->mask & OPL_MASK_CYM)) {
out[13] = _RO(calc_slot_cym(opl));
}
}
update_noise(opl, 2);
/* ADPCM */
if (opl->adpcm != NULL && !(opl->mask & OPL_MASK_ADPCM)) {
out[14] = OPL_ADPCM_calc(opl->adpcm);
}
}
INLINE static void mix_output(OPL *opl) {
int16_t out = 0;
int i;
for (i = 0; i < 15; i++) {
out += opl->ch_out[i];
}
if (opl->conv) {
OPL_RateConv_putData(opl->conv, 0, out);
} else {
opl->mix_out[0] = out;
}
}
INLINE static void mix_output_stereo(OPL *opl) {
int16_t *out = opl->mix_out;
int i;
out[0] = out[1] = 0;
for (i = 0; i < 15; i++) {
if (opl->pan[i] & 2)
out[0] += (int16_t)(opl->ch_out[i] * opl->pan_fine[i][0]);
if (opl->pan[i] & 1)
out[1] += (int16_t)(opl->ch_out[i] * opl->pan_fine[i][1]);
}
if (opl->conv) {
OPL_RateConv_putData(opl->conv, 0, out[0]);
OPL_RateConv_putData(opl->conv, 1, out[1]);
}
}
/***********************************************************
External Interfaces
***********************************************************/
OPL *OPL_new(uint32_t clk, uint32_t rate) {
OPL *opl;