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opm.c
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/* Nuked OPM
* Copyright (C) 2022 Nuke.YKT
*
* This file is part of Nuked OPM.
*
* Nuked OPM 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.
*
* Nuked OPM 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 Nuked OPM. If not, see <https://www.gnu.org/licenses/>.
*
* Nuked OPM emulator.
* Thanks:
* siliconpr0n.org(digshadow, John McMaster):
* YM2151 and other FM chip decaps and die shots.
*
* version: 0.9.3 beta
*/
#include <string.h>
#include <stdint.h>
#include "opm.h"
enum {
eg_num_attack = 0,
eg_num_decay = 1,
eg_num_sustain = 2,
eg_num_release = 3
};
/* logsin table */
static const uint16_t logsinrom[256] = {
0x859, 0x6c3, 0x607, 0x58b, 0x52e, 0x4e4, 0x4a6, 0x471,
0x443, 0x41a, 0x3f5, 0x3d3, 0x3b5, 0x398, 0x37e, 0x365,
0x34e, 0x339, 0x324, 0x311, 0x2ff, 0x2ed, 0x2dc, 0x2cd,
0x2bd, 0x2af, 0x2a0, 0x293, 0x286, 0x279, 0x26d, 0x261,
0x256, 0x24b, 0x240, 0x236, 0x22c, 0x222, 0x218, 0x20f,
0x206, 0x1fd, 0x1f5, 0x1ec, 0x1e4, 0x1dc, 0x1d4, 0x1cd,
0x1c5, 0x1be, 0x1b7, 0x1b0, 0x1a9, 0x1a2, 0x19b, 0x195,
0x18f, 0x188, 0x182, 0x17c, 0x177, 0x171, 0x16b, 0x166,
0x160, 0x15b, 0x155, 0x150, 0x14b, 0x146, 0x141, 0x13c,
0x137, 0x133, 0x12e, 0x129, 0x125, 0x121, 0x11c, 0x118,
0x114, 0x10f, 0x10b, 0x107, 0x103, 0x0ff, 0x0fb, 0x0f8,
0x0f4, 0x0f0, 0x0ec, 0x0e9, 0x0e5, 0x0e2, 0x0de, 0x0db,
0x0d7, 0x0d4, 0x0d1, 0x0cd, 0x0ca, 0x0c7, 0x0c4, 0x0c1,
0x0be, 0x0bb, 0x0b8, 0x0b5, 0x0b2, 0x0af, 0x0ac, 0x0a9,
0x0a7, 0x0a4, 0x0a1, 0x09f, 0x09c, 0x099, 0x097, 0x094,
0x092, 0x08f, 0x08d, 0x08a, 0x088, 0x086, 0x083, 0x081,
0x07f, 0x07d, 0x07a, 0x078, 0x076, 0x074, 0x072, 0x070,
0x06e, 0x06c, 0x06a, 0x068, 0x066, 0x064, 0x062, 0x060,
0x05e, 0x05c, 0x05b, 0x059, 0x057, 0x055, 0x053, 0x052,
0x050, 0x04e, 0x04d, 0x04b, 0x04a, 0x048, 0x046, 0x045,
0x043, 0x042, 0x040, 0x03f, 0x03e, 0x03c, 0x03b, 0x039,
0x038, 0x037, 0x035, 0x034, 0x033, 0x031, 0x030, 0x02f,
0x02e, 0x02d, 0x02b, 0x02a, 0x029, 0x028, 0x027, 0x026,
0x025, 0x024, 0x023, 0x022, 0x021, 0x020, 0x01f, 0x01e,
0x01d, 0x01c, 0x01b, 0x01a, 0x019, 0x018, 0x017, 0x017,
0x016, 0x015, 0x014, 0x014, 0x013, 0x012, 0x011, 0x011,
0x010, 0x00f, 0x00f, 0x00e, 0x00d, 0x00d, 0x00c, 0x00c,
0x00b, 0x00a, 0x00a, 0x009, 0x009, 0x008, 0x008, 0x007,
0x007, 0x007, 0x006, 0x006, 0x005, 0x005, 0x005, 0x004,
0x004, 0x004, 0x003, 0x003, 0x003, 0x002, 0x002, 0x002,
0x002, 0x001, 0x001, 0x001, 0x001, 0x001, 0x001, 0x001,
0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000
};
/* exp table */
static const uint16_t exprom[256] = {
0x7fa, 0x7f5, 0x7ef, 0x7ea, 0x7e4, 0x7df, 0x7da, 0x7d4,
0x7cf, 0x7c9, 0x7c4, 0x7bf, 0x7b9, 0x7b4, 0x7ae, 0x7a9,
0x7a4, 0x79f, 0x799, 0x794, 0x78f, 0x78a, 0x784, 0x77f,
0x77a, 0x775, 0x770, 0x76a, 0x765, 0x760, 0x75b, 0x756,
0x751, 0x74c, 0x747, 0x742, 0x73d, 0x738, 0x733, 0x72e,
0x729, 0x724, 0x71f, 0x71a, 0x715, 0x710, 0x70b, 0x706,
0x702, 0x6fd, 0x6f8, 0x6f3, 0x6ee, 0x6e9, 0x6e5, 0x6e0,
0x6db, 0x6d6, 0x6d2, 0x6cd, 0x6c8, 0x6c4, 0x6bf, 0x6ba,
0x6b5, 0x6b1, 0x6ac, 0x6a8, 0x6a3, 0x69e, 0x69a, 0x695,
0x691, 0x68c, 0x688, 0x683, 0x67f, 0x67a, 0x676, 0x671,
0x66d, 0x668, 0x664, 0x65f, 0x65b, 0x657, 0x652, 0x64e,
0x649, 0x645, 0x641, 0x63c, 0x638, 0x634, 0x630, 0x62b,
0x627, 0x623, 0x61e, 0x61a, 0x616, 0x612, 0x60e, 0x609,
0x605, 0x601, 0x5fd, 0x5f9, 0x5f5, 0x5f0, 0x5ec, 0x5e8,
0x5e4, 0x5e0, 0x5dc, 0x5d8, 0x5d4, 0x5d0, 0x5cc, 0x5c8,
0x5c4, 0x5c0, 0x5bc, 0x5b8, 0x5b4, 0x5b0, 0x5ac, 0x5a8,
0x5a4, 0x5a0, 0x59c, 0x599, 0x595, 0x591, 0x58d, 0x589,
0x585, 0x581, 0x57e, 0x57a, 0x576, 0x572, 0x56f, 0x56b,
0x567, 0x563, 0x560, 0x55c, 0x558, 0x554, 0x551, 0x54d,
0x549, 0x546, 0x542, 0x53e, 0x53b, 0x537, 0x534, 0x530,
0x52c, 0x529, 0x525, 0x522, 0x51e, 0x51b, 0x517, 0x514,
0x510, 0x50c, 0x509, 0x506, 0x502, 0x4ff, 0x4fb, 0x4f8,
0x4f4, 0x4f1, 0x4ed, 0x4ea, 0x4e7, 0x4e3, 0x4e0, 0x4dc,
0x4d9, 0x4d6, 0x4d2, 0x4cf, 0x4cc, 0x4c8, 0x4c5, 0x4c2,
0x4be, 0x4bb, 0x4b8, 0x4b5, 0x4b1, 0x4ae, 0x4ab, 0x4a8,
0x4a4, 0x4a1, 0x49e, 0x49b, 0x498, 0x494, 0x491, 0x48e,
0x48b, 0x488, 0x485, 0x482, 0x47e, 0x47b, 0x478, 0x475,
0x472, 0x46f, 0x46c, 0x469, 0x466, 0x463, 0x460, 0x45d,
0x45a, 0x457, 0x454, 0x451, 0x44e, 0x44b, 0x448, 0x445,
0x442, 0x43f, 0x43c, 0x439, 0x436, 0x433, 0x430, 0x42d,
0x42a, 0x428, 0x425, 0x422, 0x41f, 0x41c, 0x419, 0x416,
0x414, 0x411, 0x40e, 0x40b, 0x408, 0x406, 0x403, 0x400
};
/* Envelope generator */
static const uint32_t eg_stephi[4][4] = {
{ 0, 0, 0, 0 },
{ 1, 0, 0, 0 },
{ 1, 0, 1, 0 },
{ 1, 1, 1, 0 }
};
/* Phase generator */
static const uint32_t pg_detune[8] = { 16, 17, 19, 20, 22, 24, 27, 29 };
typedef struct {
int32_t basefreq;
int32_t approxtype;
int32_t slope;
} freqtable_t;
static const freqtable_t pg_freqtable[64] = {
{ 1299, 1, 19 },
{ 1318, 1, 19 },
{ 1337, 1, 19 },
{ 1356, 1, 20 },
{ 1376, 1, 20 },
{ 1396, 1, 20 },
{ 1416, 1, 21 },
{ 1437, 1, 20 },
{ 1458, 1, 21 },
{ 1479, 1, 21 },
{ 1501, 1, 22 },
{ 1523, 1, 22 },
{ 0, 0, 16 },
{ 0, 0, 16 },
{ 0, 0, 16 },
{ 0, 0, 16 },
{ 1545, 1, 22 },
{ 1567, 1, 22 },
{ 1590, 1, 23 },
{ 1613, 1, 23 },
{ 1637, 1, 23 },
{ 1660, 1, 24 },
{ 1685, 1, 24 },
{ 1709, 1, 24 },
{ 1734, 1, 25 },
{ 1759, 1, 25 },
{ 1785, 1, 26 },
{ 1811, 1, 26 },
{ 0, 0, 16 },
{ 0, 0, 16 },
{ 0, 0, 16 },
{ 0, 0, 16 },
{ 1837, 1, 26 },
{ 1864, 1, 27 },
{ 1891, 1, 27 },
{ 1918, 1, 28 },
{ 1946, 1, 28 },
{ 1975, 1, 28 },
{ 2003, 1, 29 },
{ 2032, 1, 30 },
{ 2062, 1, 30 },
{ 2092, 1, 30 },
{ 2122, 1, 31 },
{ 2153, 1, 31 },
{ 0, 0, 16 },
{ 0, 0, 16 },
{ 0, 0, 16 },
{ 0, 0, 16 },
{ 2185, 1, 31 },
{ 2216, 0, 31 },
{ 2249, 0, 31 },
{ 2281, 0, 31 },
{ 2315, 0, 31 },
{ 2348, 0, 31 },
{ 2382, 0, 30 },
{ 2417, 0, 30 },
{ 2452, 0, 30 },
{ 2488, 0, 30 },
{ 2524, 0, 30 },
{ 2561, 0, 30 },
{ 0, 0, 16 },
{ 0, 0, 16 },
{ 0, 0, 16 },
{ 0, 0, 16 }
};
/* FM algorithm */
static const uint32_t fm_algorithm[4][6][8] = {
{
{ 1, 1, 1, 1, 1, 1, 1, 1 }, /* M1_0 */
{ 1, 1, 1, 1, 1, 1, 1, 1 }, /* M1_1 */
{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* C1 */
{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* Last operator */
{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* Last operator */
{ 0, 0, 0, 0, 0, 0, 0, 1 } /* Out */
},
{
{ 0, 1, 0, 0, 0, 1, 0, 0 }, /* M1_0 */
{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* M1_1 */
{ 1, 1, 1, 0, 0, 0, 0, 0 }, /* C1 */
{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* Last operator */
{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* Last operator */
{ 0, 0, 0, 0, 0, 1, 1, 1 } /* Out */
},
{
{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* M1_0 */
{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* M1_1 */
{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* C1 */
{ 1, 0, 0, 1, 1, 1, 1, 0 }, /* Last operator */
{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* Last operator */
{ 0, 0, 0, 0, 1, 1, 1, 1 } /* Out */
},
{
{ 0, 0, 1, 0, 0, 1, 0, 0 }, /* M1_0 */
{ 0, 0, 0, 0, 0, 0, 0, 0 }, /* M1_1 */
{ 0, 0, 0, 1, 0, 0, 0, 0 }, /* C1 */
{ 1, 1, 0, 1, 1, 0, 0, 0 }, /* Last operator */
{ 0, 0, 1, 0, 0, 0, 0, 0 }, /* Last operator */
{ 1, 1, 1, 1, 1, 1, 1, 1 } /* Out */
}
};
static uint16_t lfo_counter2_table[] = {
0x0000, 0x4000, 0x6000, 0x7000,
0x7800, 0x7c00, 0x7e00, 0x7f00,
0x7f80, 0x7fc0, 0x7fe0, 0x7ff0,
0x7ff8, 0x7ffc, 0x7ffe, 0x7fff
};
static int32_t OPM_KCToFNum(int32_t kcode)
{
int32_t kcode_h = (kcode >> 4) & 63;
int32_t kcode_l = kcode & 15;
int32_t i, slope, sum = 0;
if (pg_freqtable[kcode_h].approxtype)
{
for (i = 0; i < 4; i++)
{
if (kcode_l & (1 << i))
{
sum += (pg_freqtable[kcode_h].slope >> (3 - i));
}
}
}
else
{
slope = pg_freqtable[kcode_h].slope | 1;
if (kcode_l & 1)
{
sum += (slope >> 3) + 2;
}
if (kcode_l & 2)
{
sum += 8;
}
if (kcode_l & 4)
{
sum += slope >> 1;
}
if (kcode_l & 8)
{
sum += slope;
sum++;
}
if ((kcode_l & 12) == 12 && (pg_freqtable[kcode_h].slope & 1) == 0)
{
sum += 4;
}
}
return pg_freqtable[kcode_h].basefreq + (sum >> 1);
}
static int32_t OPM_LFOApplyPMS(int32_t lfo, int32_t pms)
{
int32_t t, out;
int32_t top = (lfo >> 4) & 7;
if (pms != 7)
{
top >>= 1;
}
t = (top & 6) == 6 || ((top & 3) == 3 && pms >= 6);
out = top + ((top >> 2) & 1) + t;
out = out * 2 + ((lfo >> 4) & 1);
if (pms == 7)
{
out >>= 1;
}
out &= 15;
out = (lfo & 15) + out * 16;
switch (pms)
{
case 0:
default:
out = 0;
break;
case 1:
out = (out >> 5) & 3;
break;
case 2:
out = (out >> 4) & 7;
break;
case 3:
out = (out >> 3) & 15;
break;
case 4:
out = (out >> 2) & 31;
break;
case 5:
out = (out >> 1) & 63;
break;
case 6:
out = (out & 255) << 1;
break;
case 7:
out = (out & 255) << 2;
break;
}
return out;
}
static int32_t OPM_CalcKCode(int32_t kcf, int32_t lfo, int32_t lfo_sign, int32_t dt)
{
int32_t t2, t3, b0, b1, b2, b3, w2, w3, w6;
int32_t overflow1 = 0;
int32_t overflow2 = 0;
int32_t negoverflow = 0;
int32_t sum, cr;
if (!lfo_sign)
{
lfo = ~lfo;
}
sum = (kcf & 8191) + (lfo&8191) + (!lfo_sign);
cr = ((kcf & 255) + (lfo & 255) + (!lfo_sign)) >> 8;
if (sum & (1 << 13))
{
overflow1 = 1;
}
sum &= 8191;
if (lfo_sign && ((((sum >> 6) & 3) == 3) || cr))
{
sum += 64;
}
if (!lfo_sign && !cr)
{
sum += (-64)&8191;
negoverflow = 1;
}
if (sum & (1 << 13))
{
overflow2 = 1;
}
sum &= 8191;
if ((!lfo_sign && !overflow1) || (negoverflow && !overflow2))
{
sum = 0;
}
if (lfo_sign && (overflow1 || overflow2))
{
sum = 8127;
}
t2 = sum & 63;
if (dt == 2)
t2 += 20;
if (dt == 2 || dt == 3)
t2 += 32;
b0 = (t2 >> 6) & 1;
b1 = dt == 2;
b2 = ((sum >> 6) & 1);
b3 = ((sum >> 7) & 1);
w2 = (b0 && b1 && b2);
w3 = (b0 && b3);
w6 = (b0 && !w2 && !w3) || (b3 && !b0 && b1);
t2 &= 63;
t3 = (sum >> 6) + w6 + b1 + (w2 || w3) * 2 + (dt == 3) * 4 + (dt != 0) * 8;
if (t3 & 128)
{
t2 = 63;
t3 = 126;
}
sum = t3 * 64 + t2;
return sum;
}
static void OPM_PhaseCalcFNumBlock(opm_t *chip)
{
uint32_t slot = (chip->cycles + 7) % 32;
uint32_t channel = slot % 8;
uint32_t kcf = (chip->ch_kc[channel] << 6) + chip->ch_kf[channel];
uint32_t lfo = chip->lfo_pmd ? chip->lfo_pm_lock : 0;
uint32_t pms = chip->ch_pms[channel];
uint32_t dt = chip->sl_dt2[slot];
int32_t lfo_pm = OPM_LFOApplyPMS(lfo & 127, pms);
uint32_t kcode = OPM_CalcKCode(kcf, lfo_pm, (lfo & 0x80) != 0 && pms != 0 ? 0 : 1, dt);
uint32_t fnum = OPM_KCToFNum(kcode);
uint32_t kcode_h = kcode >> 8;
chip->pg_fnum[slot] = fnum;
chip->pg_kcode[slot] = kcode_h;
}
static void OPM_PhaseCalcIncrement(opm_t *chip)
{
uint32_t slot = chip->cycles;
uint32_t channel = slot % 8;
uint32_t dt = chip->sl_dt1[slot];
uint32_t dt_l = dt & 3;
uint32_t detune = 0;
uint32_t multi = chip->sl_mul[slot];
uint32_t kcode = chip->pg_kcode[slot];
uint32_t fnum = chip->pg_fnum[slot];
uint32_t block = kcode >> 2;
uint32_t basefreq = (fnum << block) >> 2;
uint32_t note, sum, sum_h, sum_l, inc;
/* Apply detune */
if (dt_l)
{
if (kcode > 0x1c)
{
kcode = 0x1c;
}
block = kcode >> 2;
note = kcode & 0x03;
sum = block + 9 + ((dt_l == 3) | (dt_l & 0x02));
sum_h = sum >> 1;
sum_l = sum & 0x01;
detune = pg_detune[(sum_l << 2) | note] >> (9 - sum_h);
}
if (dt & 0x04)
{
basefreq -= detune;
}
else
{
basefreq += detune;
}
basefreq &= 0x1ffff;
if (multi)
{
inc = basefreq * multi;
}
else
{
inc = basefreq >> 1;
}
inc &= 0xfffff;
chip->pg_inc[slot] = inc;
}
static void OPM_PhaseGenerate(opm_t *chip)
{
uint32_t slot = (chip->cycles + 27) % 32;
chip->pg_reset_latch[slot] = chip->pg_reset[slot];
slot = (chip->cycles + 25) % 32;
/* Mask increment */
if (chip->pg_reset_latch[slot])
{
chip->pg_inc[slot] = 0;
}
/* Phase step */
slot = (chip->cycles + 24) % 32;
if (chip->pg_reset_latch[slot] || chip->mode_test[3])
{
chip->pg_phase[slot] = 0;
}
chip->pg_phase[slot] += chip->pg_inc[slot];
chip->pg_phase[slot] &= 0xfffff;
}
static void OPM_PhaseDebug(opm_t *chip)
{
chip->pg_serial >>= 1;
if (chip->cycles == 5)
{
chip->pg_serial |= (chip->pg_phase[29] & 0x3ff);
}
}
static void OPM_KeyOn1(opm_t *chip)
{
uint32_t cycles = (chip->cycles + 1) % 32;
chip->kon_chanmatch = 0;
if (chip->mode_kon_channel + 24 == cycles)
{
chip->kon_chanmatch = 1;
}
}
static void OPM_KeyOn2(opm_t *chip)
{
uint32_t slot = (chip->cycles + 8) % 32;
if (chip->kon_chanmatch)
{
chip->mode_kon[(slot + 0) % 32] = chip->mode_kon_operator[0];
chip->mode_kon[(slot + 8) % 32] = chip->mode_kon_operator[2];
chip->mode_kon[(slot + 16) % 32] = chip->mode_kon_operator[1];
chip->mode_kon[(slot + 24) % 32] = chip->mode_kon_operator[3];
}
}
static void OPM_EnvelopePhase1(opm_t *chip)
{
uint32_t slot = (chip->cycles + 2) % 32;
uint32_t kon = chip->mode_kon[slot] | chip->kon_csm;
uint32_t konevent = !chip->kon[slot] && kon;
if (konevent)
{
chip->eg_state[slot] = eg_num_attack;
}
chip->kon2[slot] = chip->kon[slot];
chip->kon[slot] = kon;
}
static void OPM_EnvelopePhase2(opm_t *chip)
{
uint32_t slot = chip->cycles;
uint32_t chan = slot % 8;
uint8_t rate = 0, ksv, zr, ams;
switch (chip->eg_state[slot])
{
case eg_num_attack:
rate = chip->sl_ar[slot];
break;
case eg_num_decay:
rate = chip->sl_d1r[slot];
break;
case eg_num_sustain:
rate = chip->sl_d2r[slot];
break;
case eg_num_release:
rate = chip->sl_rr[slot] * 2 + 1;
break;
default:
break;
}
if (chip->ic)
{
rate = 31;
}
zr = rate == 0;
ksv = chip->pg_kcode[slot] >> (chip->sl_ks[slot] ^ 3);
if (chip->sl_ks[slot] == 0 && zr)
{
ksv &= ~3;
}
rate = rate * 2 + ksv;
if (rate & 64)
{
rate = 63;
}
chip->eg_tl[2] = chip->eg_tl[1];
chip->eg_tl[1] = chip->eg_tl[0];
chip->eg_tl[0] = chip->sl_tl[slot];
chip->eg_sl[1] = chip->eg_sl[0];
chip->eg_sl[0] = chip->sl_d1l[slot];
if (chip->sl_d1l[slot] == 15)
{
chip->eg_sl[0] = 31;
}
chip->eg_zr[1] = chip->eg_zr[0];
chip->eg_zr[0] = zr;
chip->eg_rate[1] = chip->eg_rate[0];
chip->eg_rate[0] = rate;
chip->eg_ratemax[1] = chip->eg_ratemax[0];
chip->eg_ratemax[0] = (rate >> 1) == 31;
ams = chip->sl_am_e[slot] ? chip->ch_ams[chan] : 0;
switch (ams)
{
default:
case 0:
chip->eg_am = 0;
break;
case 1:
chip->eg_am = chip->lfo_am_lock << 0;
break;
case 2:
chip->eg_am = chip->lfo_am_lock << 1;
break;
case 3:
chip->eg_am = chip->lfo_am_lock << 2;
break;
}
}
static void OPM_EnvelopePhase3(opm_t *chip)
{
uint32_t slot = (chip->cycles + 31) % 32;
chip->eg_shift = (chip->eg_timershift_lock + (chip->eg_rate[0] >> 2)) & 15;
chip->eg_inchi = eg_stephi[chip->eg_rate[0] & 3][chip->eg_timer_lock & 3];
chip->eg_outtemp[1] = chip->eg_outtemp[0];
chip->eg_outtemp[0] = chip->eg_level[slot] + chip->eg_am;
if (chip->eg_outtemp[0] & 1024)
{
chip->eg_outtemp[0] = 1023;
}
}
static void OPM_EnvelopePhase4(opm_t *chip)
{
uint32_t slot = (chip->cycles + 30) % 32;
uint8_t inc = 0;
uint8_t kon, eg_off, eg_zero, slreach;
if (chip->eg_clock & 2)
{
if (chip->eg_rate[1] >= 48)
{
inc = chip->eg_inchi + (chip->eg_rate[1] >> 2) - 11;
if (inc > 4)
{
inc = 4;
}
}
else if (!chip->eg_zr[1])
{
switch (chip->eg_shift)
{
case 12:
inc = chip->eg_rate[1] != 0;
break;
case 13:
inc = (chip->eg_rate[1] >> 1) & 1;
break;
case 14:
inc = chip->eg_rate[1] & 1;
break;
}
}
}
chip->eg_inc = inc;
kon = chip->kon[slot] && !chip->kon2[slot];
chip->pg_reset[slot] = kon;
chip->eg_instantattack = chip->eg_ratemax[1] && (kon || !chip->eg_ratemax[1]);
eg_off = (chip->eg_level[slot] & 0x3f0) == 0x3f0;
slreach = (chip->eg_level[slot] >> 4) == (chip->eg_sl[1] << 1);
eg_zero = chip->eg_level[slot] == 0;
chip->eg_mute = eg_off && chip->eg_state[slot] != eg_num_attack && !kon;
chip->eg_inclinear = 0;
if (!kon && !eg_off)
{
switch (chip->eg_state[slot])
{
case eg_num_decay:
if (!slreach)
chip->eg_inclinear = 1;
break;
case eg_num_sustain:
case eg_num_release:
chip->eg_inclinear = 1;
break;
}
}
chip->eg_incattack = chip->eg_state[slot] == eg_num_attack && !chip->eg_ratemax[1] && chip->kon[slot] && !eg_zero;
// Update state
if (kon)
{
chip->eg_state[slot] = eg_num_attack;
}
else if (!chip->kon[slot])
{
chip->eg_state[slot] = eg_num_release;
}
else
{
switch (chip->eg_state[slot])
{
case eg_num_attack:
if (eg_zero)
{
chip->eg_state[slot] = eg_num_decay;
}
break;
case eg_num_decay:
if (eg_off)
{
chip->eg_state[slot] = eg_num_release;
}
else if (slreach)
{
chip->eg_state[slot] = eg_num_sustain;
}
break;
case eg_num_sustain:
if (eg_off)
{
chip->eg_state[slot] = eg_num_release;
}
break;
case eg_num_release:
break;
}
}
if (chip->ic)
{
chip->eg_state[slot] = eg_num_release;
}
}
static void OPM_EnvelopePhase5(opm_t *chip)
{
uint32_t slot = (chip->cycles + 29) % 32;
uint32_t level = chip->eg_level[slot];
uint32_t step = 0;
if (chip->eg_instantattack)
{
level = 0;
}
if (chip->eg_mute || chip->ic)
{
level = 0x3ff;
}
if (chip->eg_inc)
{
if (chip->eg_inclinear)
{
step |= 1 << (chip->eg_inc - 1);
}
if (chip->eg_incattack)
{
step |= ((~(int32_t)chip->eg_level[slot]) << chip->eg_inc) >> 5;
}
}
level += step;
chip->eg_level[slot] = (uint16_t)level;
chip->eg_out[0] = chip->eg_outtemp[1] + (chip->eg_tl[2] << 3);
if (chip->eg_out[0] & 1024)
{
chip->eg_out[0] = 1023;
}
if (chip->eg_test)
{
chip->eg_out[0] = 0;
}
chip->eg_test = chip->mode_test[5];
}
static void OPM_EnvelopePhase6(opm_t *chip)
{
uint32_t slot = (chip->cycles + 28) % 32;
chip->eg_serial_bit = (chip->eg_serial >> 9) & 1;
if (chip->cycles == 3)
{
chip->eg_serial = chip->eg_out[0] ^ 1023;
}
else
{
chip->eg_serial <<= 1;
}
chip->eg_out[1] = chip->eg_out[0];
}
static void OPM_EnvelopeClock(opm_t *chip)
{
chip->eg_clock <<= 1;
if ((chip->eg_clockcnt & 2) != 0 || chip->mode_test[0])
{
chip->eg_clock |= 1;
}
if (chip->ic || (chip->cycles == 31 && (chip->eg_clockcnt & 2) != 0))
{
chip->eg_clockcnt = 0;
}
else if (chip->cycles == 31)
{
chip->eg_clockcnt++;
}
}
static void OPM_EnvelopeTimer(opm_t *chip)
{
uint32_t cycle = (chip->cycles + 31) % 16;
uint32_t cycle2;
uint8_t inc = ((chip->cycles + 31) % 32) < 16 && (chip->eg_clock & 1) != 0 && (cycle == 0 || chip->eg_timercarry);
uint8_t timerbit = (chip->eg_timer >> cycle) & 1;
uint8_t sum = timerbit + inc;
uint8_t sum0 = (sum & 1) && !chip->ic;
chip->eg_timercarry = sum >> 1;
chip->eg_timer = (chip->eg_timer & (~(1 << cycle))) | (sum0 << cycle);
cycle2 = (chip->cycles + 30) % 16;
chip->eg_timer2 <<= 1;
if ((chip->eg_timer & (1 << cycle2)) != 0 && !chip->eg_timerbstop)
{
chip->eg_timer2 |= 1;
}
if (chip->eg_timer & (1 << cycle2))
{
chip->eg_timerbstop = 1;
}
if (cycle == 0 || chip->ic2)
{
chip->eg_timerbstop = 0;
}
if (chip->cycles == 1 && (chip->eg_clock & 1) != 0)
{
chip->eg_timershift_lock = 0;
if (chip->eg_timer2 & (8 + 32 + 128 + 512 + 2048 + 8192 + 32768))
{
chip->eg_timershift_lock |= 1;
}
if (chip->eg_timer2 & (4 + 32 + 64 + 512 + 1024 + 8192 + 16384))
{
chip->eg_timershift_lock |= 2;
}
if (chip->eg_timer2 & (4 + 8 + 16 + 512 + 1024 + 2048 + 4096))
{
chip->eg_timershift_lock |= 4;
}
if (chip->eg_timer2 & (4 + 8 + 16 + 32 + 64 + 128 + 256))
{
chip->eg_timershift_lock |= 8;
}
chip->eg_timer_lock = chip->eg_timer;
}
}
static void OPM_OperatorPhase1(opm_t *chip)
{
uint32_t slot = chip->cycles;
int16_t mod = chip->op_mod[2];
chip->op_phase_in = chip->pg_phase[slot] >> 10;
if (chip->op_fbshift & 8)
{
if (chip->op_fb[1] == 0)
{
mod = 0;
}
else
{
mod = mod >> (9 - chip->op_fb[1]);
}
}
chip->op_mod_in = mod;
}
static void OPM_OperatorPhase2(opm_t *chip)
{
uint32_t slot = (chip->cycles + 31) % 32;
chip->op_phase = (chip->op_phase_in + chip->op_mod_in) & 1023;
}
static void OPM_OperatorPhase3(opm_t *chip)
{
uint32_t slot = (chip->cycles + 30) % 32;
uint16_t phase = chip->op_phase & 255;
if (chip->op_phase & 256)
{
phase ^= 255;
}
chip->op_logsin[0] = logsinrom[phase];
chip->op_sign <<= 1;
chip->op_sign |= (chip->op_phase >> 9) & 1;
}
static void OPM_OperatorPhase4(opm_t *chip)
{
uint32_t slot = (chip->cycles + 29) % 32;
chip->op_logsin[1] = chip->op_logsin[0];
}
static void OPM_OperatorPhase5(opm_t *chip)
{
uint32_t slot = (chip->cycles + 28) % 32;
chip->op_logsin[2] = chip->op_logsin[1];
}
static void OPM_OperatorPhase6(opm_t *chip)
{
uint32_t slot = (chip->cycles + 27) % 32;
chip->op_atten = chip->op_logsin[2] + (chip->eg_out[1] << 2);
if (chip->op_atten & 4096)
{
chip->op_atten = 4095;
}
}
static void OPM_OperatorPhase7(opm_t *chip)
{
uint32_t slot = (chip->cycles + 26) % 32;
chip->op_exp[0] = exprom[chip->op_atten & 255];
chip->op_pow[0] = chip->op_atten >> 8;
}
static void OPM_OperatorPhase8(opm_t *chip)
{
uint32_t slot = (chip->cycles + 25) % 32;
chip->op_exp[1] = chip->op_exp[0];
chip->op_pow[1] = chip->op_pow[0];
}
static void OPM_OperatorPhase9(opm_t *chip)
{
uint32_t slot = (chip->cycles + 24) % 32;
int16_t out = (chip->op_exp[1] << 2) >> (chip->op_pow[1]);
if (chip->op_sign & 32)
{
out = -out;
}
chip->op_out[0] = out;
}
static void OPM_OperatorPhase10(opm_t *chip)
{
uint32_t slot = (chip->cycles + 23) % 32;
chip->op_out[1] = chip->op_out[0];
}
static void OPM_OperatorPhase11(opm_t *chip)
{
uint32_t slot = (chip->cycles + 22) % 32;
chip->op_out[2] = chip->op_out[1];
}
static void OPM_OperatorPhase12(opm_t *chip)
{
uint32_t slot = (chip->cycles + 21) % 32;
chip->op_out[3] = chip->op_out[2];
}
static void OPM_OperatorPhase13(opm_t *chip)
{
uint32_t slot = (chip->cycles + 20) % 32;
chip->op_out[4] = chip->op_out[3];
chip->op_connect = chip->ch_connect[slot % 8];
}
static void OPM_OperatorPhase14(opm_t *chip)
{
uint32_t slot = (chip->cycles + 19) % 32;
chip->op_mix = chip->op_out[5] = chip->op_out[4];
chip->op_fbupdate = (chip->op_counter == 0);
chip->op_c1update = (chip->op_counter == 2);
chip->op_fbshift <<= 1;
chip->op_fbshift |= (chip->op_counter == 2);
chip->op_modtable[0] = fm_algorithm[(chip->op_counter+2)%4][0][chip->op_connect];
chip->op_modtable[1] = fm_algorithm[(chip->op_counter+2)%4][1][chip->op_connect];
chip->op_modtable[2] = fm_algorithm[(chip->op_counter+2)%4][2][chip->op_connect];
chip->op_modtable[3] = fm_algorithm[(chip->op_counter+2)%4][3][chip->op_connect];
chip->op_modtable[4] = fm_algorithm[(chip->op_counter+2)%4][4][chip->op_connect];
chip->op_mixl = fm_algorithm[chip->op_counter][5][chip->op_connect] && (chip->ch_rl[slot % 8] & 1) != 0;
chip->op_mixr = fm_algorithm[chip->op_counter][5][chip->op_connect] && (chip->ch_rl[slot % 8] & 2) != 0;
}
static void OPM_OperatorPhase15(opm_t *chip)
{
uint32_t slot = (chip->cycles + 18) % 32;
int16_t mod, mod1 = 0, mod2 = 0;
if (chip->op_modtable[0])
{
mod2 |= chip->op_m1[slot % 8][0];
}
if (chip->op_modtable[1])
{
mod1 |= chip->op_m1[slot % 8][1];
}
if (chip->op_modtable[2])
{
mod1 |= chip->op_c1[slot % 8];
}
if (chip->op_modtable[3])
{
mod2 |= chip->op_out[5];
}
if (chip->op_modtable[4])
{
mod1 |= chip->op_out[5];
}
mod = (mod1 + mod2) >> 1;