[Experimental] Added support for emulation core switching in real time!

Due to clunky playback on updated Nuked OPL3 emulator v 1.8, I kept the Nuked OPL3 1.7.4 work in parallel and be a separated switchable emulator.

1 files changed, 1391 insertions, 0 deletions

diff --git a/src/chips/nuked/nukedopl3_174.c b/src/chips/nuked/nukedopl3_174.c
new file mode 100644
index 0000000..401089c
--- /dev/null
+++ b/src/chips/nuked/nukedopl3_174.c
@@ -0,0 +1,1391 @@
+/*
+ * Copyright (C) 2013-2016 Alexey Khokholov (Nuke.YKT)
+ *
+ * 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
+ * Lesser 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.
+ *
+ *  Nuked OPL3 emulator.
+ *  Thanks:
+ *      MAME Development Team(Jarek Burczynski, Tatsuyuki Satoh):
+ *          Feedback and Rhythm part calculation information.
+ *      forums.submarine.org.uk(carbon14, opl3):
+ *          Tremolo and phase generator calculation information.
+ *      OPLx decapsulated(Matthew Gambrell, Olli Niemitalo):
+ *          OPL2 ROMs.
+ *
+ * version: 1.7.4
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "nukedopl3_174.h"
+
+#define RSM_FRAC    10
+
+/* Channel types */
+
+enum {
+    ch_2op = 0,
+    ch_4op = 1,
+    ch_4op2 = 2,
+    ch_drum = 3
+};
+
+/* Envelope key types */
+
+enum {
+    egk_norm = 0x01,
+    egk_drum = 0x02
+};
+
+
+/*
+ * logsin table
+ */
+
+static const Bit16u logsinrom[512] = {
+    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,
+    0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
+    0x001, 0x001, 0x001, 0x001, 0x001, 0x001, 0x001, 0x002,
+    0x002, 0x002, 0x002, 0x003, 0x003, 0x003, 0x004, 0x004,
+    0x004, 0x005, 0x005, 0x005, 0x006, 0x006, 0x007, 0x007,
+    0x007, 0x008, 0x008, 0x009, 0x009, 0x00a, 0x00a, 0x00b,
+    0x00c, 0x00c, 0x00d, 0x00d, 0x00e, 0x00f, 0x00f, 0x010,
+    0x011, 0x011, 0x012, 0x013, 0x014, 0x014, 0x015, 0x016,
+    0x017, 0x017, 0x018, 0x019, 0x01a, 0x01b, 0x01c, 0x01d,
+    0x01e, 0x01f, 0x020, 0x021, 0x022, 0x023, 0x024, 0x025,
+    0x026, 0x027, 0x028, 0x029, 0x02a, 0x02b, 0x02d, 0x02e,
+    0x02f, 0x030, 0x031, 0x033, 0x034, 0x035, 0x037, 0x038,
+    0x039, 0x03b, 0x03c, 0x03e, 0x03f, 0x040, 0x042, 0x043,
+    0x045, 0x046, 0x048, 0x04a, 0x04b, 0x04d, 0x04e, 0x050,
+    0x052, 0x053, 0x055, 0x057, 0x059, 0x05b, 0x05c, 0x05e,
+    0x060, 0x062, 0x064, 0x066, 0x068, 0x06a, 0x06c, 0x06e,
+    0x070, 0x072, 0x074, 0x076, 0x078, 0x07a, 0x07d, 0x07f,
+    0x081, 0x083, 0x086, 0x088, 0x08a, 0x08d, 0x08f, 0x092,
+    0x094, 0x097, 0x099, 0x09c, 0x09f, 0x0a1, 0x0a4, 0x0a7,
+    0x0a9, 0x0ac, 0x0af, 0x0b2, 0x0b5, 0x0b8, 0x0bb, 0x0be,
+    0x0c1, 0x0c4, 0x0c7, 0x0ca, 0x0cd, 0x0d1, 0x0d4, 0x0d7,
+    0x0db, 0x0de, 0x0e2, 0x0e5, 0x0e9, 0x0ec, 0x0f0, 0x0f4,
+    0x0f8, 0x0fb, 0x0ff, 0x103, 0x107, 0x10b, 0x10f, 0x114,
+    0x118, 0x11c, 0x121, 0x125, 0x129, 0x12e, 0x133, 0x137,
+    0x13c, 0x141, 0x146, 0x14b, 0x150, 0x155, 0x15b, 0x160,
+    0x166, 0x16b, 0x171, 0x177, 0x17c, 0x182, 0x188, 0x18f,
+    0x195, 0x19b, 0x1a2, 0x1a9, 0x1b0, 0x1b7, 0x1be, 0x1c5,
+    0x1cd, 0x1d4, 0x1dc, 0x1e4, 0x1ec, 0x1f5, 0x1fd, 0x206,
+    0x20f, 0x218, 0x222, 0x22c, 0x236, 0x240, 0x24b, 0x256,
+    0x261, 0x26d, 0x279, 0x286, 0x293, 0x2a0, 0x2af, 0x2bd,
+    0x2cd, 0x2dc, 0x2ed, 0x2ff, 0x311, 0x324, 0x339, 0x34e,
+    0x365, 0x37e, 0x398, 0x3b5, 0x3d3, 0x3f5, 0x41a, 0x443,
+    0x471, 0x4a6, 0x4e4, 0x52e, 0x58b, 0x607, 0x6c3, 0x859
+};
+
+/*
+ * exp table
+ */
+
+static const Bit16u exprom[256] = {
+    0xff4, 0xfea, 0xfde, 0xfd4, 0xfc8, 0xfbe, 0xfb4, 0xfa8,
+    0xf9e, 0xf92, 0xf88, 0xf7e, 0xf72, 0xf68, 0xf5c, 0xf52,
+    0xf48, 0xf3e, 0xf32, 0xf28, 0xf1e, 0xf14, 0xf08, 0xefe,
+    0xef4, 0xeea, 0xee0, 0xed4, 0xeca, 0xec0, 0xeb6, 0xeac,
+    0xea2, 0xe98, 0xe8e, 0xe84, 0xe7a, 0xe70, 0xe66, 0xe5c,
+    0xe52, 0xe48, 0xe3e, 0xe34, 0xe2a, 0xe20, 0xe16, 0xe0c,
+    0xe04, 0xdfa, 0xdf0, 0xde6, 0xddc, 0xdd2, 0xdca, 0xdc0,
+    0xdb6, 0xdac, 0xda4, 0xd9a, 0xd90, 0xd88, 0xd7e, 0xd74,
+    0xd6a, 0xd62, 0xd58, 0xd50, 0xd46, 0xd3c, 0xd34, 0xd2a,
+    0xd22, 0xd18, 0xd10, 0xd06, 0xcfe, 0xcf4, 0xcec, 0xce2,
+    0xcda, 0xcd0, 0xcc8, 0xcbe, 0xcb6, 0xcae, 0xca4, 0xc9c,
+    0xc92, 0xc8a, 0xc82, 0xc78, 0xc70, 0xc68, 0xc60, 0xc56,
+    0xc4e, 0xc46, 0xc3c, 0xc34, 0xc2c, 0xc24, 0xc1c, 0xc12,
+    0xc0a, 0xc02, 0xbfa, 0xbf2, 0xbea, 0xbe0, 0xbd8, 0xbd0,
+    0xbc8, 0xbc0, 0xbb8, 0xbb0, 0xba8, 0xba0, 0xb98, 0xb90,
+    0xb88, 0xb80, 0xb78, 0xb70, 0xb68, 0xb60, 0xb58, 0xb50,
+    0xb48, 0xb40, 0xb38, 0xb32, 0xb2a, 0xb22, 0xb1a, 0xb12,
+    0xb0a, 0xb02, 0xafc, 0xaf4, 0xaec, 0xae4, 0xade, 0xad6,
+    0xace, 0xac6, 0xac0, 0xab8, 0xab0, 0xaa8, 0xaa2, 0xa9a,
+    0xa92, 0xa8c, 0xa84, 0xa7c, 0xa76, 0xa6e, 0xa68, 0xa60,
+    0xa58, 0xa52, 0xa4a, 0xa44, 0xa3c, 0xa36, 0xa2e, 0xa28,
+    0xa20, 0xa18, 0xa12, 0xa0c, 0xa04, 0x9fe, 0x9f6, 0x9f0,
+    0x9e8, 0x9e2, 0x9da, 0x9d4, 0x9ce, 0x9c6, 0x9c0, 0x9b8,
+    0x9b2, 0x9ac, 0x9a4, 0x99e, 0x998, 0x990, 0x98a, 0x984,
+    0x97c, 0x976, 0x970, 0x96a, 0x962, 0x95c, 0x956, 0x950,
+    0x948, 0x942, 0x93c, 0x936, 0x930, 0x928, 0x922, 0x91c,
+    0x916, 0x910, 0x90a, 0x904, 0x8fc, 0x8f6, 0x8f0, 0x8ea,
+    0x8e4, 0x8de, 0x8d8, 0x8d2, 0x8cc, 0x8c6, 0x8c0, 0x8ba,
+    0x8b4, 0x8ae, 0x8a8, 0x8a2, 0x89c, 0x896, 0x890, 0x88a,
+    0x884, 0x87e, 0x878, 0x872, 0x86c, 0x866, 0x860, 0x85a,
+    0x854, 0x850, 0x84a, 0x844, 0x83e, 0x838, 0x832, 0x82c,
+    0x828, 0x822, 0x81c, 0x816, 0x810, 0x80c, 0x806, 0x800
+};
+
+/*
+ * freq mult table multiplied by 2
+ *
+ * 1/2, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 12, 12, 15, 15
+ */
+
+static const Bit8u mt[16] = {
+    1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 20, 24, 24, 30, 30
+};
+
+/*
+ * ksl table
+ */
+
+static const Bit8u kslrom[16] = {
+    0, 32, 40, 45, 48, 51, 53, 55, 56, 58, 59, 60, 61, 62, 63, 64
+};
+
+static const Bit8u kslshift[4] = {
+    8, 1, 2, 0
+};
+
+/*
+ * envelope generator constants
+ */
+
+static const Bit8u eg_incstep[3][4][8] = {
+    {
+        { 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, 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 }
+    },
+    {
+        { 1, 1, 1, 1, 1, 1, 1, 1 },
+        { 2, 2, 1, 1, 1, 1, 1, 1 },
+        { 2, 2, 1, 1, 2, 2, 1, 1 },
+        { 2, 2, 2, 2, 2, 2, 1, 1 }
+    }
+};
+
+static const Bit8u eg_incdesc[16] = {
+    0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2
+};
+
+static const Bit8s eg_incsh[16] = {
+    0, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 0, -1, -2
+};
+
+/*
+ * address decoding
+ */
+
+static const Bit8s ad_slot[0x20] = {
+    0, 1, 2, 3, 4, 5, -1, -1, 6, 7, 8, 9, 10, 11, -1, -1,
+    12, 13, 14, 15, 16, 17, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
+};
+
+static const Bit8u ch_slot[18] = {
+    0, 1, 2, 6, 7, 8, 12, 13, 14, 18, 19, 20, 24, 25, 26, 30, 31, 32
+};
+
+/*
+ * Envelope generator
+ */
+
+static void OPL3_EnvelopeGenOff(opl3_slot *slot);
+static void OPL3_EnvelopeGenAttack(opl3_slot *slot);
+static void OPL3_EnvelopeGenDecay(opl3_slot *slot);
+static void OPL3_EnvelopeGenSustain(opl3_slot *slot);
+static void OPL3_EnvelopeGenRelease(opl3_slot *slot);
+
+typedef void(*envelope_genfunc)(opl3_slot *slot);
+
+envelope_genfunc envelope_gen[5] = {
+    OPL3_EnvelopeGenOff,
+    OPL3_EnvelopeGenAttack,
+    OPL3_EnvelopeGenDecay,
+    OPL3_EnvelopeGenSustain,
+    OPL3_EnvelopeGenRelease
+};
+
+enum envelope_gen_num
+{
+    envelope_gen_num_off = 0,
+    envelope_gen_num_attack = 1,
+    envelope_gen_num_decay = 2,
+    envelope_gen_num_sustain = 3,
+    envelope_gen_num_release = 4
+};
+
+static Bit8u OPL3_EnvelopeCalcRate(opl3_slot *slot, Bit8u reg_rate)
+{
+    Bit8u rate;
+    if (reg_rate == 0x00)
+    {
+        return 0x00;
+    }
+    rate = (reg_rate << 2)
+         + (slot->reg_ksr ? slot->channel->ksv : (slot->channel->ksv >> 2));
+    if (rate > 0x3c)
+    {
+        rate = 0x3c;
+    }
+    return rate;
+}
+
+static void OPL3_EnvelopeUpdateKSL(opl3_slot *slot)
+{
+    Bit16s ksl = (kslrom[slot->channel->f_num >> 6] << 2)
+               - ((0x08 - slot->channel->block) << 5);
+    if (ksl < 0)
+    {
+        ksl = 0;
+    }
+    slot->eg_ksl = (Bit8u)ksl;
+}
+
+static void OPL3_EnvelopeUpdateRate(opl3_slot *slot)
+{
+    switch (slot->eg_gen)
+    {
+    case envelope_gen_num_off:
+    case envelope_gen_num_attack:
+        slot->eg_rate = OPL3_EnvelopeCalcRate(slot, slot->reg_ar);
+        break;
+    case envelope_gen_num_decay:
+        slot->eg_rate = OPL3_EnvelopeCalcRate(slot, slot->reg_dr);
+        break;
+    case envelope_gen_num_sustain:
+    case envelope_gen_num_release:
+        slot->eg_rate = OPL3_EnvelopeCalcRate(slot, slot->reg_rr);
+        break;
+    }
+}
+
+static void OPL3_EnvelopeGenOff(opl3_slot *slot)
+{
+    slot->eg_rout = 0x1ff;
+}
+
+static void OPL3_EnvelopeGenAttack(opl3_slot *slot)
+{
+    if (slot->eg_rout == 0x00)
+    {
+        slot->eg_gen = envelope_gen_num_decay;
+        OPL3_EnvelopeUpdateRate(slot);
+        return;
+    }
+    slot->eg_rout += ((~slot->eg_rout) * slot->eg_inc) >> 3;
+    if (slot->eg_rout < 0x00)
+    {
+        slot->eg_rout = 0x00;
+    }
+}
+
+static void OPL3_EnvelopeGenDecay(opl3_slot *slot)
+{
+    if (slot->eg_rout >= slot->reg_sl << 4)
+    {
+        slot->eg_gen = envelope_gen_num_sustain;
+        OPL3_EnvelopeUpdateRate(slot);
+        return;
+    }
+    slot->eg_rout += slot->eg_inc;
+}
+
+static void OPL3_EnvelopeGenSustain(opl3_slot *slot)
+{
+    if (!slot->reg_type)
+    {
+        OPL3_EnvelopeGenRelease(slot);
+    }
+}
+
+static void OPL3_EnvelopeGenRelease(opl3_slot *slot)
+{
+    if (slot->eg_rout >= 0x1ff)
+    {
+        slot->eg_gen = envelope_gen_num_off;
+        slot->eg_rout = 0x1ff;
+        OPL3_EnvelopeUpdateRate(slot);
+        return;
+    }
+    slot->eg_rout += slot->eg_inc;
+}
+
+static void OPL3_EnvelopeCalc(opl3_slot *slot)
+{
+    Bit8u rate_h, rate_l;
+    Bit8u inc = 0;
+    rate_h = slot->eg_rate >> 2;
+    rate_l = slot->eg_rate & 3;
+    if (eg_incsh[rate_h] > 0)
+    {
+        if ((slot->chip->timer & ((1 << eg_incsh[rate_h]) - 1)) == 0)
+        {
+            inc = eg_incstep[eg_incdesc[rate_h]][rate_l]
+                            [((slot->chip->timer)>> eg_incsh[rate_h]) & 0x07];
+        }
+    }
+    else
+    {
+        inc = eg_incstep[eg_incdesc[rate_h]][rate_l]
+                        [slot->chip->timer & 0x07] << (-eg_incsh[rate_h]);
+    }
+    slot->eg_inc = inc;
+    slot->eg_out = slot->eg_rout + (slot->reg_tl << 2)
+                 + (slot->eg_ksl >> kslshift[slot->reg_ksl]) + *slot->trem;
+    if (slot->eg_out > 0x1ff)  /* TODO: Remove this if possible */
+    {
+        slot->eg_out = 0x1ff;
+    }
+    slot->eg_out <<= 3;
+
+    envelope_gen[slot->eg_gen](slot);
+}
+
+static void OPL3_EnvelopeKeyOn(opl3_slot *slot, Bit8u type)
+{
+    if (!slot->key)
+    {
+        slot->eg_gen = envelope_gen_num_attack;
+        OPL3_EnvelopeUpdateRate(slot);
+        if ((slot->eg_rate >> 2) == 0x0f)
+        {
+            slot->eg_gen = envelope_gen_num_decay;
+            OPL3_EnvelopeUpdateRate(slot);
+            slot->eg_rout = 0x00;
+        }
+        slot->pg_phase = 0x00;
+    }
+    slot->key |= type;
+}
+
+static void OPL3_EnvelopeKeyOff(opl3_slot *slot, Bit8u type)
+{
+    if (slot->key)
+    {
+        slot->key &= (~type);
+        if (!slot->key)
+        {
+            slot->eg_gen = envelope_gen_num_release;
+            OPL3_EnvelopeUpdateRate(slot);
+        }
+    }
+}
+
+/*
+ * Phase Generator
+ */
+
+static void OPL3_PhaseGenerate(opl3_slot *slot)
+{
+    Bit16u f_num;
+    Bit32u basefreq;
+
+    f_num = slot->channel->f_num;
+    if (slot->reg_vib)
+    {
+        Bit8s range;
+        Bit8u vibpos;
+
+        range = (f_num >> 7) & 7;
+        vibpos = slot->chip->vibpos;
+
+        if (!(vibpos & 3))
+        {
+            range = 0;
+        }
+        else if (vibpos & 1)
+        {
+            range >>= 1;
+        }
+        range >>= slot->chip->vibshift;
+
+        if (vibpos & 4)
+        {
+            range = -range;
+        }
+        f_num += range;
+    }
+    basefreq = (f_num << slot->channel->block) >> 1;
+    slot->pg_phase += (basefreq * mt[slot->reg_mult]) >> 1;
+}
+
+/*
+ * Noise Generator
+ */
+
+static void OPL3_NoiseGenerate(opl3_chip *chip)
+{
+    if (chip->noise & 0x01)
+    {
+        chip->noise ^= 0x800302;
+    }
+    chip->noise >>= 1;
+}
+
+/*
+ * Slot
+ */
+
+static void OPL3_SlotWrite20(opl3_slot *slot, Bit8u data)
+{
+    if ((data >> 7) & 0x01)
+    {
+        slot->trem = &slot->chip->tremolo;
+    }
+    else
+    {
+        slot->trem = (Bit8u*)&slot->chip->zeromod;
+    }
+    slot->reg_vib = (data >> 6) & 0x01;
+    slot->reg_type = (data >> 5) & 0x01;
+    slot->reg_ksr = (data >> 4) & 0x01;
+    slot->reg_mult = data & 0x0f;
+    OPL3_EnvelopeUpdateRate(slot);
+}
+
+static void OPL3_SlotWrite40(opl3_slot *slot, Bit8u data)
+{
+    slot->reg_ksl = (data >> 6) & 0x03;
+    slot->reg_tl = data & 0x3f;
+    OPL3_EnvelopeUpdateKSL(slot);
+}
+
+static void OPL3_SlotWrite60(opl3_slot *slot, Bit8u data)
+{
+    slot->reg_ar = (data >> 4) & 0x0f;
+    slot->reg_dr = data & 0x0f;
+    OPL3_EnvelopeUpdateRate(slot);
+}
+
+static void OPL3_SlotWrite80(opl3_slot *slot, Bit8u data)
+{
+    slot->reg_sl = (data >> 4) & 0x0f;
+    if (slot->reg_sl == 0x0f)
+    {
+        slot->reg_sl = 0x1f;
+    }
+    slot->reg_rr = data & 0x0f;
+    OPL3_EnvelopeUpdateRate(slot);
+}
+
+static void OPL3_SlotWriteE0(opl3_slot *slot, Bit8u data)
+{
+    slot->reg_wf = data & 0x07;
+    if (slot->chip->newm == 0x00)
+    {
+        slot->reg_wf &= 0x03;
+    }
+
+    switch (slot->reg_wf)
+    {
+    case 1:
+    case 4:
+    case 5:
+        slot->maskzero = 0x200;
+        break;
+    case 3:
+        slot->maskzero = 0x100;
+        break;
+    default:
+        slot->maskzero = 0;
+        break;
+    }
+
+    switch (slot->reg_wf)
+    {
+    case 4:
+        slot->signpos = (31-8);  /* sigext of (phase & 0x100) */
+        break;
+    case 0:
+    case 6:
+    case 7:
+        slot->signpos = (31-9);  /* sigext of (phase & 0x200) */
+        break;
+    default:
+        slot->signpos = (31-16);  /* set "neg" to zero */
+        break;
+    }
+
+    switch (slot->reg_wf)
+    {
+    case 4:
+    case 5:
+        slot->phaseshift = 1;
+        break;
+    case 6:
+        slot->phaseshift = 16; /* set phase to zero and flag for non-sin wave */
+        break;
+    case 7:
+        slot->phaseshift = 32; /* no shift (work by mod 32), but flag for non-sin wave */
+        break;
+    default:
+        slot->phaseshift = 0;
+        break;
+    }
+}
+
+static void OPL3_SlotGeneratePhase(opl3_slot *slot, Bit16u phase)
+{
+    Bit32u neg, level;
+    Bit8u  phaseshift;
+
+    /* Fast paths for mute segments */
+    if (phase & slot->maskzero)
+    {
+        slot->out = 0;
+        return;
+    }
+
+    neg = (Bit32s)((Bit32u)phase << slot->signpos) >> 31;
+    phaseshift = slot->phaseshift;
+    level = slot->eg_out;
+
+    phase <<= phaseshift;
+    if (phaseshift <= 1)
+    {
+        level += logsinrom[phase & 0x1ff];
+    }
+    else
+    {
+        level += ((phase ^ neg) & 0x3ff) << 3;
+    }
+    slot->out = exprom[level & 0xff] >> (level >> 8) ^ neg;
+}
+
+static void OPL3_SlotGenerate(opl3_slot *slot)
+{
+    OPL3_SlotGeneratePhase(slot, (Bit16u)(slot->pg_phase >> 9) + *slot->mod);
+}
+
+static void OPL3_SlotGenerateZM(opl3_slot *slot)
+{
+    OPL3_SlotGeneratePhase(slot, (Bit16u)(slot->pg_phase >> 9));
+}
+
+static void OPL3_SlotCalcFB(opl3_slot *slot)
+{
+    if (slot->channel->fb != 0x00)
+    {
+        slot->fbmod = (slot->prout + slot->out) >> (0x09 - slot->channel->fb);
+    }
+    else
+    {
+        slot->fbmod = 0;
+    }
+    slot->prout = slot->out;
+}
+
+/*
+ * Channel
+ */
+
+static void OPL3_ChannelSetupAlg(opl3_channel *channel);
+
+static void OPL3_ChannelUpdateRhythm(opl3_chip *chip, Bit8u data)
+{
+    opl3_channel *channel6;
+    opl3_channel *channel7;
+    opl3_channel *channel8;
+    Bit8u chnum;
+
+    chip->rhy = data & 0x3f;
+    if (chip->rhy & 0x20)
+    {
+        channel6 = &chip->channel[6];
+        channel7 = &chip->channel[7];
+        channel8 = &chip->channel[8];
+        channel6->out[0] = &channel6->slots[1]->out;
+        channel6->out[1] = &channel6->slots[1]->out;
+        channel6->out[2] = &chip->zeromod;
+        channel6->out[3] = &chip->zeromod;
+        channel7->out[0] = &channel7->slots[0]->out;
+        channel7->out[1] = &channel7->slots[0]->out;
+        channel7->out[2] = &channel7->slots[1]->out;
+        channel7->out[3] = &channel7->slots[1]->out;
+        channel8->out[0] = &channel8->slots[0]->out;
+        channel8->out[1] = &channel8->slots[0]->out;
+        channel8->out[2] = &channel8->slots[1]->out;
+        channel8->out[3] = &channel8->slots[1]->out;
+        for (chnum = 6; chnum < 9; chnum++)
+        {
+            chip->channel[chnum].chtype = ch_drum;
+        }
+        OPL3_ChannelSetupAlg(channel6);
+        /*hh*/
+        if (chip->rhy & 0x01)
+        {
+            OPL3_EnvelopeKeyOn(channel7->slots[0], egk_drum);
+        }
+        else
+        {
+            OPL3_EnvelopeKeyOff(channel7->slots[0], egk_drum);
+        }
+        /*tc*/
+        if (chip->rhy & 0x02)
+        {
+            OPL3_EnvelopeKeyOn(channel8->slots[1], egk_drum);
+        }
+        else
+        {
+            OPL3_EnvelopeKeyOff(channel8->slots[1], egk_drum);
+        }
+        /*tom*/
+        if (chip->rhy & 0x04)
+        {
+            OPL3_EnvelopeKeyOn(channel8->slots[0], egk_drum);
+        }
+        else
+        {
+            OPL3_EnvelopeKeyOff(channel8->slots[0], egk_drum);
+        }
+        /*sd*/
+        if (chip->rhy & 0x08)
+        {
+            OPL3_EnvelopeKeyOn(channel7->slots[1], egk_drum);
+        }
+        else
+        {
+            OPL3_EnvelopeKeyOff(channel7->slots[1], egk_drum);
+        }
+        /*bd*/
+        if (chip->rhy & 0x10)
+        {
+            OPL3_EnvelopeKeyOn(channel6->slots[0], egk_drum);
+            OPL3_EnvelopeKeyOn(channel6->slots[1], egk_drum);
+        }
+        else
+        {
+            OPL3_EnvelopeKeyOff(channel6->slots[0], egk_drum);
+            OPL3_EnvelopeKeyOff(channel6->slots[1], egk_drum);
+        }
+    }
+    else
+    {
+        for (chnum = 6; chnum < 9; chnum++)
+        {
+            chip->channel[chnum].chtype = ch_2op;
+            OPL3_ChannelSetupAlg(&chip->channel[chnum]);
+            OPL3_EnvelopeKeyOff(chip->channel[chnum].slots[0], egk_drum);
+            OPL3_EnvelopeKeyOff(chip->channel[chnum].slots[1], egk_drum);
+        }
+    }
+}
+
+static void OPL3_ChannelWriteA0(opl3_channel *channel, Bit8u data)
+{
+    if (channel->chip->newm && channel->chtype == ch_4op2)
+    {
+        return;
+    }
+    channel->f_num = (channel->f_num & 0x300) | data;
+    channel->ksv = (channel->block << 1)
+                 | ((channel->f_num >> (0x09 - channel->chip->nts)) & 0x01);
+    OPL3_EnvelopeUpdateKSL(channel->slots[0]);
+    OPL3_EnvelopeUpdateKSL(channel->slots[1]);
+    OPL3_EnvelopeUpdateRate(channel->slots[0]);
+    OPL3_EnvelopeUpdateRate(channel->slots[1]);
+    if (channel->chip->newm && channel->chtype == ch_4op)
+    {
+        channel->pair->f_num = channel->f_num;
+        channel->pair->ksv = channel->ksv;
+        OPL3_EnvelopeUpdateKSL(channel->pair->slots[0]);
+        OPL3_EnvelopeUpdateKSL(channel->pair->slots[1]);
+        OPL3_EnvelopeUpdateRate(channel->pair->slots[0]);
+        OPL3_EnvelopeUpdateRate(channel->pair->slots[1]);
+    }
+}
+
+static void OPL3_ChannelWriteB0(opl3_channel *channel, Bit8u data)
+{
+    if (channel->chip->newm && channel->chtype == ch_4op2)
+    {
+        return;
+    }
+    channel->f_num = (channel->f_num & 0xff) | ((data & 0x03) << 8);
+    channel->block = (data >> 2) & 0x07;
+    channel->ksv = (channel->block << 1)
+                 | ((channel->f_num >> (0x09 - channel->chip->nts)) & 0x01);
+    OPL3_EnvelopeUpdateKSL(channel->slots[0]);
+    OPL3_EnvelopeUpdateKSL(channel->slots[1]);
+    OPL3_EnvelopeUpdateRate(channel->slots[0]);
+    OPL3_EnvelopeUpdateRate(channel->slots[1]);
+    if (channel->chip->newm && channel->chtype == ch_4op)
+    {
+        channel->pair->f_num = channel->f_num;
+        channel->pair->block = channel->block;
+        channel->pair->ksv = channel->ksv;
+        OPL3_EnvelopeUpdateKSL(channel->pair->slots[0]);
+        OPL3_EnvelopeUpdateKSL(channel->pair->slots[1]);
+        OPL3_EnvelopeUpdateRate(channel->pair->slots[0]);
+        OPL3_EnvelopeUpdateRate(channel->pair->slots[1]);
+    }
+}
+
+static void OPL3_ChannelSetupAlg(opl3_channel *channel)
+{
+    if (channel->chtype == ch_drum)
+    {
+        switch (channel->alg & 0x01)
+        {
+        case 0x00:
+            channel->slots[0]->mod = &channel->slots[0]->fbmod;
+            channel->slots[1]->mod = &channel->slots[0]->out;
+            break;
+        case 0x01:
+            channel->slots[0]->mod = &channel->slots[0]->fbmod;
+            channel->slots[1]->mod = &channel->chip->zeromod;
+            break;
+        }
+        return;
+    }
+    if (channel->alg & 0x08)
+    {
+        return;
+    }
+    if (channel->alg & 0x04)
+    {
+        channel->pair->out[0] = &channel->chip->zeromod;
+        channel->pair->out[1] = &channel->chip->zeromod;
+        channel->pair->out[2] = &channel->chip->zeromod;
+        channel->pair->out[3] = &channel->chip->zeromod;
+        switch (channel->alg & 0x03)
+        {
+        case 0x00:
+            channel->pair->slots[0]->mod = &channel->pair->slots[0]->fbmod;
+            channel->pair->slots[1]->mod = &channel->pair->slots[0]->out;
+            channel->slots[0]->mod = &channel->pair->slots[1]->out;
+            channel->slots[1]->mod = &channel->slots[0]->out;
+            channel->out[0] = &channel->slots[1]->out;
+            channel->out[1] = &channel->chip->zeromod;
+            channel->out[2] = &channel->chip->zeromod;
+            channel->out[3] = &channel->chip->zeromod;
+            break;
+        case 0x01:
+            channel->pair->slots[0]->mod = &channel->pair->slots[0]->fbmod;
+            channel->pair->slots[1]->mod = &channel->pair->slots[0]->out;
+            channel->slots[0]->mod = &channel->chip->zeromod;
+            channel->slots[1]->mod = &channel->slots[0]->out;
+            channel->out[0] = &channel->pair->slots[1]->out;
+            channel->out[1] = &channel->slots[1]->out;
+            channel->out[2] = &channel->chip->zeromod;
+            channel->out[3] = &channel->chip->zeromod;
+            break;
+        case 0x02:
+            channel->pair->slots[0]->mod = &channel->pair->slots[0]->fbmod;
+            channel->pair->slots[1]->mod = &channel->chip->zeromod;
+            channel->slots[0]->mod = &channel->pair->slots[1]->out;
+            channel->slots[1]->mod = &channel->slots[0]->out;
+            channel->out[0] = &channel->pair->slots[0]->out;
+            channel->out[1] = &channel->slots[1]->out;
+            channel->out[2] = &channel->chip->zeromod;
+            channel->out[3] = &channel->chip->zeromod;
+            break;
+        case 0x03:
+            channel->pair->slots[0]->mod = &channel->pair->slots[0]->fbmod;
+            channel->pair->slots[1]->mod = &channel->chip->zeromod;
+            channel->slots[0]->mod = &channel->pair->slots[1]->out;
+            channel->slots[1]->mod = &channel->chip->zeromod;
+            channel->out[0] = &channel->pair->slots[0]->out;
+            channel->out[1] = &channel->slots[0]->out;
+            channel->out[2] = &channel->slots[1]->out;
+            channel->out[3] = &channel->chip->zeromod;
+            break;
+        }
+    }
+    else
+    {
+        switch (channel->alg & 0x01)
+        {
+        case 0x00:
+            channel->slots[0]->mod = &channel->slots[0]->fbmod;
+            channel->slots[1]->mod = &channel->slots[0]->out;
+            channel->out[0] = &channel->slots[1]->out;
+            channel->out[1] = &channel->chip->zeromod;
+            channel->out[2] = &channel->chip->zeromod;
+            channel->out[3] = &channel->chip->zeromod;
+            break;
+        case 0x01:
+            channel->slots[0]->mod = &channel->slots[0]->fbmod;
+            channel->slots[1]->mod = &channel->chip->zeromod;
+            channel->out[0] = &channel->slots[0]->out;
+            channel->out[1] = &channel->slots[1]->out;
+            channel->out[2] = &channel->chip->zeromod;
+            channel->out[3] = &channel->chip->zeromod;
+            break;
+        }
+    }
+}
+
+static void OPL3_ChannelWriteC0(opl3_channel *channel, Bit8u data)
+{
+    channel->fb = (data & 0x0e) >> 1;
+    channel->con = data & 0x01;
+    channel->alg = channel->con;
+    if (channel->chip->newm)
+    {
+        if (channel->chtype == ch_4op)
+        {
+            channel->pair->alg = 0x04 | (channel->con << 1) | (channel->pair->con);
+            channel->alg = 0x08;
+            OPL3_ChannelSetupAlg(channel->pair);
+        }
+        else if (channel->chtype == ch_4op2)
+        {
+            channel->alg = 0x04 | (channel->pair->con << 1) | (channel->con);
+            channel->pair->alg = 0x08;
+            OPL3_ChannelSetupAlg(channel);
+        }
+        else
+        {
+            OPL3_ChannelSetupAlg(channel);
+        }
+    }
+    else
+    {
+        OPL3_ChannelSetupAlg(channel);
+    }
+    if (channel->chip->newm)
+    {
+        channel->cha = ((data >> 4) & 0x01) ? ~0 : 0;
+        channel->chb = ((data >> 5) & 0x01) ? ~0 : 0;
+    }
+    else
+    {
+        channel->cha = channel->chb = ~0;
+    }
+}
+
+static void OPL3_ChannelKeyOn(opl3_channel *channel)
+{
+    if (channel->chip->newm)
+    {
+        if (channel->chtype == ch_4op)
+        {
+            OPL3_EnvelopeKeyOn(channel->slots[0], egk_norm);
+            OPL3_EnvelopeKeyOn(channel->slots[1], egk_norm);
+            OPL3_EnvelopeKeyOn(channel->pair->slots[0], egk_norm);
+            OPL3_EnvelopeKeyOn(channel->pair->slots[1], egk_norm);
+        }
+        else if (channel->chtype == ch_2op || channel->chtype == ch_drum)
+        {
+            OPL3_EnvelopeKeyOn(channel->slots[0], egk_norm);
+            OPL3_EnvelopeKeyOn(channel->slots[1], egk_norm);
+        }
+    }
+    else
+    {
+        OPL3_EnvelopeKeyOn(channel->slots[0], egk_norm);
+        OPL3_EnvelopeKeyOn(channel->slots[1], egk_norm);
+    }
+}
+
+static void OPL3_ChannelKeyOff(opl3_channel *channel)
+{
+    if (channel->chip->newm)
+    {
+        if (channel->chtype == ch_4op)
+        {
+            OPL3_EnvelopeKeyOff(channel->slots[0], egk_norm);
+            OPL3_EnvelopeKeyOff(channel->slots[1], egk_norm);
+            OPL3_EnvelopeKeyOff(channel->pair->slots[0], egk_norm);
+            OPL3_EnvelopeKeyOff(channel->pair->slots[1], egk_norm);
+        }
+        else if (channel->chtype == ch_2op || channel->chtype == ch_drum)
+        {
+            OPL3_EnvelopeKeyOff(channel->slots[0], egk_norm);
+            OPL3_EnvelopeKeyOff(channel->slots[1], egk_norm);
+        }
+    }
+    else
+    {
+        OPL3_EnvelopeKeyOff(channel->slots[0], egk_norm);
+        OPL3_EnvelopeKeyOff(channel->slots[1], egk_norm);
+    }
+}
+
+static void OPL3_ChannelSet4Op(opl3_chip *chip, Bit8u data)
+{
+    Bit8u bit;
+    Bit8u chnum;
+    for (bit = 0; bit < 6; bit++)
+    {
+        chnum = bit;
+        if (bit >= 3)
+        {
+            chnum += 9 - 3;
+        }
+        if ((data >> bit) & 0x01)
+        {
+            chip->channel[chnum].chtype = ch_4op;
+            chip->channel[chnum + 3].chtype = ch_4op2;
+        }
+        else
+        {
+            chip->channel[chnum].chtype = ch_2op;
+            chip->channel[chnum + 3].chtype = ch_2op;
+        }
+    }
+}
+
+static Bit16s OPL3_ClipSample(Bit32s sample)
+{
+    if (sample > 32767)
+    {
+        sample = 32767;
+    }
+    else if (sample < -32768)
+    {
+        sample = -32768;
+    }
+    return (Bit16s)sample;
+}
+
+static void OPL3_GenerateRhythm1(opl3_chip *chip)
+{
+    opl3_channel *channel6;
+    opl3_channel *channel7;
+    opl3_channel *channel8;
+    Bit16u phase14;
+    Bit16u phase17;
+    Bit16u phase;
+    Bit16u phasebit;
+
+    channel6 = &chip->channel[6];
+    channel7 = &chip->channel[7];
+    channel8 = &chip->channel[8];
+    OPL3_SlotGenerate(channel6->slots[0]);
+    phase14 = (channel7->slots[0]->pg_phase >> 9) & 0x3ff;
+    phase17 = (channel8->slots[1]->pg_phase >> 9) & 0x3ff;
+    phase = 0x00;
+    /*hh tc phase bit*/
+    phasebit = ((phase14 & 0x08) | (((phase14 >> 5) ^ phase14) & 0x04)
+             | (((phase17 >> 2) ^ phase17) & 0x08)) ? 0x01 : 0x00;
+    /*hh*/
+    phase = (phasebit << 9)
+          | (0x34 << ((phasebit ^ (chip->noise & 0x01)) << 1));
+    OPL3_SlotGeneratePhase(channel7->slots[0], phase);
+    /*tt*/
+    OPL3_SlotGenerateZM(channel8->slots[0]);
+}
+
+static void OPL3_GenerateRhythm2(opl3_chip *chip)
+{
+    opl3_channel *channel6;
+    opl3_channel *channel7;
+    opl3_channel *channel8;
+    Bit16u phase14;
+    Bit16u phase17;
+    Bit16u phase;
+    Bit16u phasebit;
+
+    channel6 = &chip->channel[6];
+    channel7 = &chip->channel[7];
+    channel8 = &chip->channel[8];
+    OPL3_SlotGenerate(channel6->slots[1]);
+    phase14 = (channel7->slots[0]->pg_phase >> 9) & 0x3ff;
+    phase17 = (channel8->slots[1]->pg_phase >> 9) & 0x3ff;
+    phase = 0x00;
+    /*hh tc phase bit*/
+    phasebit = ((phase14 & 0x08) | (((phase14 >> 5) ^ phase14) & 0x04)
+             | (((phase17 >> 2) ^ phase17) & 0x08)) ? 0x01 : 0x00;
+    /*sd*/
+    phase = (0x100 << ((phase14 >> 8) & 0x01)) ^ ((chip->noise & 0x01) << 8);
+    OPL3_SlotGeneratePhase(channel7->slots[1], phase);
+    /*tc*/
+    phase = 0x100 | (phasebit << 9);
+    OPL3_SlotGeneratePhase(channel8->slots[1], phase);
+}
+
+void OPL3v17_Generate(opl3_chip *chip, Bit16s *buf)
+{
+    Bit8u ii;
+    Bit8u jj;
+    Bit16s accm;
+
+    buf[1] = OPL3_ClipSample(chip->mixbuff[1]);
+
+    for (ii = 0; ii < 12; ii++)
+    {
+        OPL3_SlotCalcFB(&chip->chipslot[ii]);
+        OPL3_PhaseGenerate(&chip->chipslot[ii]);
+        OPL3_EnvelopeCalc(&chip->chipslot[ii]);
+        OPL3_SlotGenerate(&chip->chipslot[ii]);
+    }
+
+    for (ii = 12; ii < 15; ii++)
+    {
+        OPL3_SlotCalcFB(&chip->chipslot[ii]);
+        OPL3_PhaseGenerate(&chip->chipslot[ii]);
+        OPL3_EnvelopeCalc(&chip->chipslot[ii]);
+    }
+
+    if (chip->rhy & 0x20)
+    {
+        OPL3_GenerateRhythm1(chip);
+    }
+    else
+    {
+        OPL3_SlotGenerate(&chip->chipslot[12]);
+        OPL3_SlotGenerate(&chip->chipslot[13]);
+        OPL3_SlotGenerate(&chip->chipslot[14]);
+    }
+
+    chip->mixbuff[0] = 0;
+    for (ii = 0; ii < 18; ii++)
+    {
+        accm = 0;
+        for (jj = 0; jj < 4; jj++)
+        {
+            accm += *chip->channel[ii].out[jj];
+        }
+        chip->mixbuff[0] += (Bit16s)(accm & chip->channel[ii].cha);
+    }
+
+    for (ii = 15; ii < 18; ii++)
+    {
+        OPL3_SlotCalcFB(&chip->chipslot[ii]);
+        OPL3_PhaseGenerate(&chip->chipslot[ii]);
+        OPL3_EnvelopeCalc(&chip->chipslot[ii]);
+    }
+
+    if (chip->rhy & 0x20)
+    {
+        OPL3_GenerateRhythm2(chip);
+    }
+    else
+    {
+        OPL3_SlotGenerate(&chip->chipslot[15]);
+        OPL3_SlotGenerate(&chip->chipslot[16]);
+        OPL3_SlotGenerate(&chip->chipslot[17]);
+    }
+
+    buf[0] = OPL3_ClipSample(chip->mixbuff[0]);
+
+    for (ii = 18; ii < 33; ii++)
+    {
+        OPL3_SlotCalcFB(&chip->chipslot[ii]);
+        OPL3_PhaseGenerate(&chip->chipslot[ii]);
+        OPL3_EnvelopeCalc(&chip->chipslot[ii]);
+        OPL3_SlotGenerate(&chip->chipslot[ii]);
+    }
+
+    chip->mixbuff[1] = 0;
+    for (ii = 0; ii < 18; ii++)
+    {
+        accm = 0;
+        for (jj = 0; jj < 4; jj++)
+        {
+            accm += *chip->channel[ii].out[jj];
+        }
+        chip->mixbuff[1] += (Bit16s)(accm & chip->channel[ii].chb);
+    }
+
+    for (ii = 33; ii < 36; ii++)
+    {
+        OPL3_SlotCalcFB(&chip->chipslot[ii]);
+        OPL3_PhaseGenerate(&chip->chipslot[ii]);
+        OPL3_EnvelopeCalc(&chip->chipslot[ii]);
+        OPL3_SlotGenerate(&chip->chipslot[ii]);
+    }
+
+    OPL3_NoiseGenerate(chip);
+
+    if ((chip->timer & 0x3f) == 0x3f)
+    {
+        chip->tremolopos = (chip->tremolopos + 1) % 210;
+    }
+    if (chip->tremolopos < 105)
+    {
+        chip->tremolo = chip->tremolopos >> chip->tremoloshift;
+    }
+    else
+    {
+        chip->tremolo = (210 - chip->tremolopos) >> chip->tremoloshift;
+    }
+
+    if ((chip->timer & 0x3ff) == 0x3ff)
+    {
+        chip->vibpos = (chip->vibpos + 1) & 7;
+    }
+
+    chip->timer++;
+
+    while (chip->writebuf[chip->writebuf_cur].time <= chip->writebuf_samplecnt)
+    {
+        if (!(chip->writebuf[chip->writebuf_cur].reg & 0x200))
+        {
+            break;
+        }
+        chip->writebuf[chip->writebuf_cur].reg &= 0x1ff;
+        OPL3v17_WriteReg(chip, chip->writebuf[chip->writebuf_cur].reg,
+                      chip->writebuf[chip->writebuf_cur].data);
+        chip->writebuf_cur = (chip->writebuf_cur + 1) % OPL_WRITEBUF_SIZE;
+    }
+    chip->writebuf_samplecnt++;
+}
+
+void OPL3v17_GenerateResampled(opl3_chip *chip, Bit16s *buf)
+{
+    while (chip->samplecnt >= chip->rateratio)
+    {
+        chip->oldsamples[0] = chip->samples[0];
+        chip->oldsamples[1] = chip->samples[1];
+        OPL3v17_Generate(chip, chip->samples);
+        chip->samplecnt -= chip->rateratio;
+    }
+    buf[0] = (Bit16s)((chip->oldsamples[0] * (chip->rateratio - chip->samplecnt)
+                     + chip->samples[0] * chip->samplecnt) / chip->rateratio);
+    buf[1] = (Bit16s)((chip->oldsamples[1] * (chip->rateratio - chip->samplecnt)
+                     + chip->samples[1] * chip->samplecnt) / chip->rateratio);
+    chip->samplecnt += 1 << RSM_FRAC;
+}
+
+void OPL3v17_Reset(opl3_chip *chip, Bit32u samplerate)
+{
+    Bit8u slotnum;
+    Bit8u channum;
+
+    memset(chip, 0, sizeof(opl3_chip));
+    for (slotnum = 0; slotnum < 36; slotnum++)
+    {
+        chip->chipslot[slotnum].chip = chip;
+        chip->chipslot[slotnum].mod = &chip->zeromod;
+        chip->chipslot[slotnum].eg_rout = 0x1ff;
+        chip->chipslot[slotnum].eg_out = 0x1ff << 3;
+        chip->chipslot[slotnum].eg_gen = envelope_gen_num_off;
+        chip->chipslot[slotnum].trem = (Bit8u*)&chip->zeromod;
+        chip->chipslot[slotnum].signpos = (31-9);  /* for wf=0 need use sigext of (phase & 0x200) */
+    }
+    for (channum = 0; channum < 18; channum++)
+    {
+        chip->channel[channum].slots[0] = &chip->chipslot[ch_slot[channum]];
+        chip->channel[channum].slots[1] = &chip->chipslot[ch_slot[channum] + 3];
+        chip->chipslot[ch_slot[channum]].channel = &chip->channel[channum];
+        chip->chipslot[ch_slot[channum] + 3].channel = &chip->channel[channum];
+        if ((channum % 9) < 3)
+        {
+            chip->channel[channum].pair = &chip->channel[channum + 3];
+        }
+        else if ((channum % 9) < 6)
+        {
+            chip->channel[channum].pair = &chip->channel[channum - 3];
+        }
+        chip->channel[channum].chip = chip;
+        chip->channel[channum].out[0] = &chip->zeromod;
+        chip->channel[channum].out[1] = &chip->zeromod;
+        chip->channel[channum].out[2] = &chip->zeromod;
+        chip->channel[channum].out[3] = &chip->zeromod;
+        chip->channel[channum].chtype = ch_2op;
+        chip->channel[channum].cha = ~0;
+        chip->channel[channum].chb = ~0;
+        OPL3_ChannelSetupAlg(&chip->channel[channum]);
+    }
+    chip->noise = 0x306600;
+    chip->rateratio = (samplerate << RSM_FRAC) / 49716;
+    chip->tremoloshift = 4;
+    chip->vibshift = 1;
+}
+
+void OPL3v17_WriteReg(opl3_chip *chip, Bit16u reg, Bit8u v)
+{
+    Bit8u high = (reg >> 8) & 0x01;
+    Bit8u regm = reg & 0xff;
+    switch (regm & 0xf0)
+    {
+    case 0x00:
+        if (high)
+        {
+            switch (regm & 0x0f)
+            {
+            case 0x04:
+                OPL3_ChannelSet4Op(chip, v);
+                break;
+            case 0x05:
+                chip->newm = v & 0x01;
+                break;
+            }
+        }
+        else
+        {
+            switch (regm & 0x0f)
+            {
+            case 0x08:
+                chip->nts = (v >> 6) & 0x01;
+                break;
+            }
+        }
+        break;
+    case 0x20:
+    case 0x30:
+        if (ad_slot[regm & 0x1f] >= 0)
+        {
+            OPL3_SlotWrite20(&chip->chipslot[18 * high + ad_slot[regm & 0x1f]], v);
+        }
+        break;
+    case 0x40:
+    case 0x50:
+        if (ad_slot[regm & 0x1f] >= 0)
+        {
+            OPL3_SlotWrite40(&chip->chipslot[18 * high + ad_slot[regm & 0x1f]], v);
+        }
+        break;
+    case 0x60:
+    case 0x70:
+        if (ad_slot[regm & 0x1f] >= 0)
+        {
+            OPL3_SlotWrite60(&chip->chipslot[18 * high + ad_slot[regm & 0x1f]], v);
+        }
+        break;
+    case 0x80:
+    case 0x90:
+        if (ad_slot[regm & 0x1f] >= 0)
+        {
+            OPL3_SlotWrite80(&chip->chipslot[18 * high + ad_slot[regm & 0x1f]], v);
+        }
+        break;
+    case 0xe0:
+    case 0xf0:
+        if (ad_slot[regm & 0x1f] >= 0)
+        {
+            OPL3_SlotWriteE0(&chip->chipslot[18 * high + ad_slot[regm & 0x1f]], v);
+        }
+        break;
+    case 0xa0:
+        if ((regm & 0x0f) < 9)
+        {
+            OPL3_ChannelWriteA0(&chip->channel[9 * high + (regm & 0x0f)], v);
+        }
+        break;
+    case 0xb0:
+        if (regm == 0xbd && !high)
+        {
+            chip->tremoloshift = (((v >> 7) ^ 1) << 1) + 2;
+            chip->vibshift = ((v >> 6) & 0x01) ^ 1;
+            OPL3_ChannelUpdateRhythm(chip, v);
+        }
+        else if ((regm & 0x0f) < 9)
+        {
+            OPL3_ChannelWriteB0(&chip->channel[9 * high + (regm & 0x0f)], v);
+            if (v & 0x20)
+            {
+                OPL3_ChannelKeyOn(&chip->channel[9 * high + (regm & 0x0f)]);
+            }
+            else
+            {
+                OPL3_ChannelKeyOff(&chip->channel[9 * high + (regm & 0x0f)]);
+            }
+        }
+        break;
+    case 0xc0:
+        if ((regm & 0x0f) < 9)
+        {
+            OPL3_ChannelWriteC0(&chip->channel[9 * high + (regm & 0x0f)], v);
+        }
+        break;
+    }
+}
+
+void OPL3v17_WriteRegBuffered(opl3_chip *chip, Bit16u reg, Bit8u v)
+{
+    Bit64u time1, time2;
+
+    if (chip->writebuf[chip->writebuf_last].reg & 0x200)
+    {
+        OPL3v17_WriteReg(chip, chip->writebuf[chip->writebuf_last].reg & 0x1ff,
+                      chip->writebuf[chip->writebuf_last].data);
+
+        chip->writebuf_cur = (chip->writebuf_last + 1) % OPL_WRITEBUF_SIZE;
+        chip->writebuf_samplecnt = chip->writebuf[chip->writebuf_last].time;
+    }
+
+    chip->writebuf[chip->writebuf_last].reg = reg | 0x200;
+    chip->writebuf[chip->writebuf_last].data = v;
+    time1 = chip->writebuf_lasttime + OPL_WRITEBUF_DELAY;
+    time2 = chip->writebuf_samplecnt;
+
+    if (time1 < time2)
+    {
+        time1 = time2;
+    }
+
+    chip->writebuf[chip->writebuf_last].time = time1;
+    chip->writebuf_lasttime = time1;
+    chip->writebuf_last = (chip->writebuf_last + 1) % OPL_WRITEBUF_SIZE;
+}
+
+void OPL3v17_GenerateStream(opl3_chip *chip, Bit16s *sndptr, Bit32u numsamples)
+{
+    Bit32u i;
+
+    for(i = 0; i < numsamples; i++)
+    {
+        OPL3v17_GenerateResampled(chip, sndptr);
+        sndptr += 2;
+    }
+}
+
+#define OPL3_MIN(A, B)          (((A) > (B)) ? (B) : (A))
+#define OPL3_MAX(A, B)          (((A) < (B)) ? (B) : (A))
+#define OPL3_CLAMP(V, MIN, MAX) OPL3_MAX(OPL3_MIN(V, MAX), MIN)
+
+void OPL3v17_GenerateStreamMix(opl3_chip *chip, Bit16s *sndptr, Bit32u numsamples)
+{
+    Bit32u i;
+    Bit16s sample[2];
+    Bit32s mix[2];
+
+    for(i = 0; i < numsamples; i++)
+    {
+        OPL3v17_GenerateResampled(chip, sample);
+        mix[0] = sndptr[0] + sample[0];
+        mix[1] = sndptr[1] + sample[1];
+        sndptr[0] = OPL3_CLAMP(mix[0], INT16_MIN, INT16_MAX);
+        sndptr[1] = OPL3_CLAMP(mix[1], INT16_MIN, INT16_MAX);
+        sndptr += 2;
+    }
+}
+