aboutsummaryrefslogtreecommitdiff
path: root/Nuked-OPL3/opl3.c
diff options
context:
space:
mode:
authorJuan J. Martinez <jjm@usebox.net>2023-05-15 12:31:46 +0100
committerJuan J. Martinez <jjm@usebox.net>2023-05-18 12:19:16 +0100
commit06f50ed77949cee495a1d8d98fec16648a5c8ea9 (patch)
tree6a138f6692c32f66cc98b9331dbc7d57e5b35543 /Nuked-OPL3/opl3.c
parentccf1ea4a34a789da326a321589c2757e5b1d749c (diff)
downloadtr8vm-sound-opl3.tar.gz
tr8vm-sound-opl3.zip
Added OPL3 supportsound-opl3
Diffstat (limited to 'Nuked-OPL3/opl3.c')
-rw-r--r--Nuked-OPL3/opl3.c1530
1 files changed, 1530 insertions, 0 deletions
diff --git a/Nuked-OPL3/opl3.c b/Nuked-OPL3/opl3.c
new file mode 100644
index 0000000..9128ba8
--- /dev/null
+++ b/Nuked-OPL3/opl3.c
@@ -0,0 +1,1530 @@
+/* Nuked OPL3
+ * Copyright (C) 2013-2020 Nuke.YKT
+ *
+ * This file is part of Nuked OPL3.
+ *
+ * Nuked OPL3 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 OPL3 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 OPL3. If not, see <https://www.gnu.org/licenses/>.
+
+ * 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.
+ * siliconpr0n.org(John McMaster, digshadow):
+ * YMF262 and VRC VII decaps and die shots.
+ *
+ * version: 1.8
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "opl3.h"
+
+#if OPL_ENABLE_STEREOEXT && !defined OPL_SIN
+#ifndef _USE_MATH_DEFINES
+#define _USE_MATH_DEFINES 1
+#endif
+#include <math.h>
+/* input: [0, 256), output: [0, 65536] */
+#define OPL_SIN(x) ((int32_t)(sin((x) * M_PI / 512.0) * 65536.0))
+#endif
+
+/* Quirk: Some FM channels are output one sample later on the left side than the right. */
+#ifndef OPL_QUIRK_CHANNELSAMPLEDELAY
+#define OPL_QUIRK_CHANNELSAMPLEDELAY (!OPL_ENABLE_STEREOEXT)
+#endif
+
+#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 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
+};
+
+/*
+ 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 uint8_t mt[16] = {
+ 1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 20, 24, 24, 30, 30
+};
+
+/*
+ ksl table
+*/
+
+static const uint8_t kslrom[16] = {
+ 0, 32, 40, 45, 48, 51, 53, 55, 56, 58, 59, 60, 61, 62, 63, 64
+};
+
+static const uint8_t kslshift[4] = {
+ 8, 1, 2, 0
+};
+
+/*
+ envelope generator constants
+*/
+
+static const uint8_t eg_incstep[4][4] = {
+ { 0, 0, 0, 0 },
+ { 1, 0, 0, 0 },
+ { 1, 0, 1, 0 },
+ { 1, 1, 1, 0 }
+};
+
+/*
+ address decoding
+*/
+
+static const int8_t 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 uint8_t ch_slot[18] = {
+ 0, 1, 2, 6, 7, 8, 12, 13, 14, 18, 19, 20, 24, 25, 26, 30, 31, 32
+};
+
+#if OPL_ENABLE_STEREOEXT
+/*
+ stereo extension panning table
+*/
+
+static int32_t panpot_lut[256];
+static uint8_t panpot_lut_build = 0;
+#endif
+
+/*
+ Envelope generator
+*/
+
+typedef int16_t(*envelope_sinfunc)(uint16_t phase, uint16_t envelope);
+typedef void(*envelope_genfunc)(opl3_slot *slott);
+
+static int16_t OPL3_EnvelopeCalcExp(uint32_t level)
+{
+ if (level > 0x1fff)
+ {
+ level = 0x1fff;
+ }
+ return (exprom[level & 0xff] << 1) >> (level >> 8);
+}
+
+static int16_t OPL3_EnvelopeCalcSin0(uint16_t phase, uint16_t envelope)
+{
+ uint16_t out = 0;
+ uint16_t neg = 0;
+ phase &= 0x3ff;
+ if (phase & 0x200)
+ {
+ neg = 0xffff;
+ }
+ if (phase & 0x100)
+ {
+ out = logsinrom[(phase & 0xff) ^ 0xff];
+ }
+ else
+ {
+ out = logsinrom[phase & 0xff];
+ }
+ return OPL3_EnvelopeCalcExp(out + (envelope << 3)) ^ neg;
+}
+
+static int16_t OPL3_EnvelopeCalcSin1(uint16_t phase, uint16_t envelope)
+{
+ uint16_t out = 0;
+ phase &= 0x3ff;
+ if (phase & 0x200)
+ {
+ out = 0x1000;
+ }
+ else if (phase & 0x100)
+ {
+ out = logsinrom[(phase & 0xff) ^ 0xff];
+ }
+ else
+ {
+ out = logsinrom[phase & 0xff];
+ }
+ return OPL3_EnvelopeCalcExp(out + (envelope << 3));
+}
+
+static int16_t OPL3_EnvelopeCalcSin2(uint16_t phase, uint16_t envelope)
+{
+ uint16_t out = 0;
+ phase &= 0x3ff;
+ if (phase & 0x100)
+ {
+ out = logsinrom[(phase & 0xff) ^ 0xff];
+ }
+ else
+ {
+ out = logsinrom[phase & 0xff];
+ }
+ return OPL3_EnvelopeCalcExp(out + (envelope << 3));
+}
+
+static int16_t OPL3_EnvelopeCalcSin3(uint16_t phase, uint16_t envelope)
+{
+ uint16_t out = 0;
+ phase &= 0x3ff;
+ if (phase & 0x100)
+ {
+ out = 0x1000;
+ }
+ else
+ {
+ out = logsinrom[phase & 0xff];
+ }
+ return OPL3_EnvelopeCalcExp(out + (envelope << 3));
+}
+
+static int16_t OPL3_EnvelopeCalcSin4(uint16_t phase, uint16_t envelope)
+{
+ uint16_t out = 0;
+ uint16_t neg = 0;
+ phase &= 0x3ff;
+ if ((phase & 0x300) == 0x100)
+ {
+ neg = 0xffff;
+ }
+ if (phase & 0x200)
+ {
+ out = 0x1000;
+ }
+ else if (phase & 0x80)
+ {
+ out = logsinrom[((phase ^ 0xff) << 1) & 0xff];
+ }
+ else
+ {
+ out = logsinrom[(phase << 1) & 0xff];
+ }
+ return OPL3_EnvelopeCalcExp(out + (envelope << 3)) ^ neg;
+}
+
+static int16_t OPL3_EnvelopeCalcSin5(uint16_t phase, uint16_t envelope)
+{
+ uint16_t out = 0;
+ phase &= 0x3ff;
+ if (phase & 0x200)
+ {
+ out = 0x1000;
+ }
+ else if (phase & 0x80)
+ {
+ out = logsinrom[((phase ^ 0xff) << 1) & 0xff];
+ }
+ else
+ {
+ out = logsinrom[(phase << 1) & 0xff];
+ }
+ return OPL3_EnvelopeCalcExp(out + (envelope << 3));
+}
+
+static int16_t OPL3_EnvelopeCalcSin6(uint16_t phase, uint16_t envelope)
+{
+ uint16_t neg = 0;
+ phase &= 0x3ff;
+ if (phase & 0x200)
+ {
+ neg = 0xffff;
+ }
+ return OPL3_EnvelopeCalcExp(envelope << 3) ^ neg;
+}
+
+static int16_t OPL3_EnvelopeCalcSin7(uint16_t phase, uint16_t envelope)
+{
+ uint16_t out = 0;
+ uint16_t neg = 0;
+ phase &= 0x3ff;
+ if (phase & 0x200)
+ {
+ neg = 0xffff;
+ phase = (phase & 0x1ff) ^ 0x1ff;
+ }
+ out = phase << 3;
+ return OPL3_EnvelopeCalcExp(out + (envelope << 3)) ^ neg;
+}
+
+static const envelope_sinfunc envelope_sin[8] = {
+ OPL3_EnvelopeCalcSin0,
+ OPL3_EnvelopeCalcSin1,
+ OPL3_EnvelopeCalcSin2,
+ OPL3_EnvelopeCalcSin3,
+ OPL3_EnvelopeCalcSin4,
+ OPL3_EnvelopeCalcSin5,
+ OPL3_EnvelopeCalcSin6,
+ OPL3_EnvelopeCalcSin7
+};
+
+enum envelope_gen_num
+{
+ envelope_gen_num_attack = 0,
+ envelope_gen_num_decay = 1,
+ envelope_gen_num_sustain = 2,
+ envelope_gen_num_release = 3
+};
+
+static void OPL3_EnvelopeUpdateKSL(opl3_slot *slot)
+{
+ int16_t ksl = (kslrom[slot->channel->f_num >> 6] << 2)
+ - ((0x08 - slot->channel->block) << 5);
+ if (ksl < 0)
+ {
+ ksl = 0;
+ }
+ slot->eg_ksl = (uint8_t)ksl;
+}
+
+static void OPL3_EnvelopeCalc(opl3_slot *slot)
+{
+ uint8_t nonzero;
+ uint8_t rate;
+ uint8_t rate_hi;
+ uint8_t rate_lo;
+ uint8_t reg_rate = 0;
+ uint8_t ks;
+ uint8_t eg_shift, shift;
+ uint16_t eg_rout;
+ int16_t eg_inc;
+ uint8_t eg_off;
+ uint8_t reset = 0;
+ slot->eg_out = slot->eg_rout + (slot->reg_tl << 2)
+ + (slot->eg_ksl >> kslshift[slot->reg_ksl]) + *slot->trem;
+ if (slot->key && slot->eg_gen == envelope_gen_num_release)
+ {
+ reset = 1;
+ reg_rate = slot->reg_ar;
+ }
+ else
+ {
+ switch (slot->eg_gen)
+ {
+ case envelope_gen_num_attack:
+ reg_rate = slot->reg_ar;
+ break;
+ case envelope_gen_num_decay:
+ reg_rate = slot->reg_dr;
+ break;
+ case envelope_gen_num_sustain:
+ if (!slot->reg_type)
+ {
+ reg_rate = slot->reg_rr;
+ }
+ break;
+ case envelope_gen_num_release:
+ reg_rate = slot->reg_rr;
+ break;
+ }
+ }
+ slot->pg_reset = reset;
+ ks = slot->channel->ksv >> ((slot->reg_ksr ^ 1) << 1);
+ nonzero = (reg_rate != 0);
+ rate = ks + (reg_rate << 2);
+ rate_hi = rate >> 2;
+ rate_lo = rate & 0x03;
+ if (rate_hi & 0x10)
+ {
+ rate_hi = 0x0f;
+ }
+ eg_shift = rate_hi + slot->chip->eg_add;
+ shift = 0;
+ if (nonzero)
+ {
+ if (rate_hi < 12)
+ {
+ if (slot->chip->eg_state)
+ {
+ switch (eg_shift)
+ {
+ case 12:
+ shift = 1;
+ break;
+ case 13:
+ shift = (rate_lo >> 1) & 0x01;
+ break;
+ case 14:
+ shift = rate_lo & 0x01;
+ break;
+ default:
+ break;
+ }
+ }
+ }
+ else
+ {
+ shift = (rate_hi & 0x03) + eg_incstep[rate_lo][slot->chip->timer & 0x03];
+ if (shift & 0x04)
+ {
+ shift = 0x03;
+ }
+ if (!shift)
+ {
+ shift = slot->chip->eg_state;
+ }
+ }
+ }
+ eg_rout = slot->eg_rout;
+ eg_inc = 0;
+ eg_off = 0;
+ /* Instant attack */
+ if (reset && rate_hi == 0x0f)
+ {
+ eg_rout = 0x00;
+ }
+ /* Envelope off */
+ if ((slot->eg_rout & 0x1f8) == 0x1f8)
+ {
+ eg_off = 1;
+ }
+ if (slot->eg_gen != envelope_gen_num_attack && !reset && eg_off)
+ {
+ eg_rout = 0x1ff;
+ }
+ switch (slot->eg_gen)
+ {
+ case envelope_gen_num_attack:
+ if (!slot->eg_rout)
+ {
+ slot->eg_gen = envelope_gen_num_decay;
+ }
+ else if (slot->key && shift > 0 && rate_hi != 0x0f)
+ {
+ eg_inc = ~slot->eg_rout >> (4 - shift);
+ }
+ break;
+ case envelope_gen_num_decay:
+ if ((slot->eg_rout >> 4) == slot->reg_sl)
+ {
+ slot->eg_gen = envelope_gen_num_sustain;
+ }
+ else if (!eg_off && !reset && shift > 0)
+ {
+ eg_inc = 1 << (shift - 1);
+ }
+ break;
+ case envelope_gen_num_sustain:
+ case envelope_gen_num_release:
+ if (!eg_off && !reset && shift > 0)
+ {
+ eg_inc = 1 << (shift - 1);
+ }
+ break;
+ }
+ slot->eg_rout = (eg_rout + eg_inc) & 0x1ff;
+ /* Key off */
+ if (reset)
+ {
+ slot->eg_gen = envelope_gen_num_attack;
+ }
+ if (!slot->key)
+ {
+ slot->eg_gen = envelope_gen_num_release;
+ }
+}
+
+static void OPL3_EnvelopeKeyOn(opl3_slot *slot, uint8_t type)
+{
+ slot->key |= type;
+}
+
+static void OPL3_EnvelopeKeyOff(opl3_slot *slot, uint8_t type)
+{
+ slot->key &= ~type;
+}
+
+/*
+ Phase Generator
+*/
+
+static void OPL3_PhaseGenerate(opl3_slot *slot)
+{
+ opl3_chip *chip;
+ uint16_t f_num;
+ uint32_t basefreq;
+ uint8_t rm_xor, n_bit;
+ uint32_t noise;
+ uint16_t phase;
+
+ chip = slot->chip;
+ f_num = slot->channel->f_num;
+ if (slot->reg_vib)
+ {
+ int8_t range;
+ uint8_t 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;
+ phase = (uint16_t)(slot->pg_phase >> 9);
+ if (slot->pg_reset)
+ {
+ slot->pg_phase = 0;
+ }
+ slot->pg_phase += (basefreq * mt[slot->reg_mult]) >> 1;
+ /* Rhythm mode */
+ noise = chip->noise;
+ slot->pg_phase_out = phase;
+ if (slot->slot_num == 13) /* hh */
+ {
+ chip->rm_hh_bit2 = (phase >> 2) & 1;
+ chip->rm_hh_bit3 = (phase >> 3) & 1;
+ chip->rm_hh_bit7 = (phase >> 7) & 1;
+ chip->rm_hh_bit8 = (phase >> 8) & 1;
+ }
+ if (slot->slot_num == 17 && (chip->rhy & 0x20)) /* tc */
+ {
+ chip->rm_tc_bit3 = (phase >> 3) & 1;
+ chip->rm_tc_bit5 = (phase >> 5) & 1;
+ }
+ if (chip->rhy & 0x20)
+ {
+ rm_xor = (chip->rm_hh_bit2 ^ chip->rm_hh_bit7)
+ | (chip->rm_hh_bit3 ^ chip->rm_tc_bit5)
+ | (chip->rm_tc_bit3 ^ chip->rm_tc_bit5);
+ switch (slot->slot_num)
+ {
+ case 13: /* hh */
+ slot->pg_phase_out = rm_xor << 9;
+ if (rm_xor ^ (noise & 1))
+ {
+ slot->pg_phase_out |= 0xd0;
+ }
+ else
+ {
+ slot->pg_phase_out |= 0x34;
+ }
+ break;
+ case 16: /* sd */
+ slot->pg_phase_out = (chip->rm_hh_bit8 << 9)
+ | ((chip->rm_hh_bit8 ^ (noise & 1)) << 8);
+ break;
+ case 17: /* tc */
+ slot->pg_phase_out = (rm_xor << 9) | 0x80;
+ break;
+ default:
+ break;
+ }
+ }
+ n_bit = ((noise >> 14) ^ noise) & 0x01;
+ chip->noise = (noise >> 1) | (n_bit << 22);
+}
+
+/*
+ Slot
+*/
+
+static void OPL3_SlotWrite20(opl3_slot *slot, uint8_t data)
+{
+ if ((data >> 7) & 0x01)
+ {
+ slot->trem = &slot->chip->tremolo;
+ }
+ else
+ {
+ slot->trem = (uint8_t*)&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;
+}
+
+static void OPL3_SlotWrite40(opl3_slot *slot, uint8_t data)
+{
+ slot->reg_ksl = (data >> 6) & 0x03;
+ slot->reg_tl = data & 0x3f;
+ OPL3_EnvelopeUpdateKSL(slot);
+}
+
+static void OPL3_SlotWrite60(opl3_slot *slot, uint8_t data)
+{
+ slot->reg_ar = (data >> 4) & 0x0f;
+ slot->reg_dr = data & 0x0f;
+}
+
+static void OPL3_SlotWrite80(opl3_slot *slot, uint8_t data)
+{
+ slot->reg_sl = (data >> 4) & 0x0f;
+ if (slot->reg_sl == 0x0f)
+ {
+ slot->reg_sl = 0x1f;
+ }
+ slot->reg_rr = data & 0x0f;
+}
+
+static void OPL3_SlotWriteE0(opl3_slot *slot, uint8_t data)
+{
+ slot->reg_wf = data & 0x07;
+ if (slot->chip->newm == 0x00)
+ {
+ slot->reg_wf &= 0x03;
+ }
+}
+
+static void OPL3_SlotGenerate(opl3_slot *slot)
+{
+ slot->out = envelope_sin[slot->reg_wf](slot->pg_phase_out + *slot->mod, slot->eg_out);
+}
+
+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, uint8_t data)
+{
+ opl3_channel *channel6;
+ opl3_channel *channel7;
+ opl3_channel *channel8;
+ uint8_t 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);
+ OPL3_ChannelSetupAlg(channel7);
+ OPL3_ChannelSetupAlg(channel8);
+ /* 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, uint8_t 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]);
+ 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]);
+ }
+}
+
+static void OPL3_ChannelWriteB0(opl3_channel *channel, uint8_t 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]);
+ 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]);
+ }
+}
+
+static void OPL3_ChannelSetupAlg(opl3_channel *channel)
+{
+ if (channel->chtype == ch_drum)
+ {
+ if (channel->ch_num == 7 || channel->ch_num == 8)
+ {
+ channel->slots[0]->mod = &channel->chip->zeromod;
+ channel->slots[1]->mod = &channel->chip->zeromod;
+ return;
+ }
+ 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_ChannelUpdateAlg(opl3_channel *channel)
+{
+ 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);
+ }
+}
+
+static void OPL3_ChannelWriteC0(opl3_channel *channel, uint8_t data)
+{
+ channel->fb = (data & 0x0e) >> 1;
+ channel->con = data & 0x01;
+ OPL3_ChannelUpdateAlg(channel);
+ if (channel->chip->newm)
+ {
+ channel->cha = ((data >> 4) & 0x01) ? ~0 : 0;
+ channel->chb = ((data >> 5) & 0x01) ? ~0 : 0;
+ channel->chc = ((data >> 6) & 0x01) ? ~0 : 0;
+ channel->chd = ((data >> 7) & 0x01) ? ~0 : 0;
+ }
+ else
+ {
+ channel->cha = channel->chb = (uint16_t)~0;
+ // TODO: Verify on real chip if DAC2 output is disabled in compat mode
+ channel->chc = channel->chd = 0;
+ }
+#if OPL_ENABLE_STEREOEXT
+ if (!channel->chip->stereoext)
+ {
+ channel->leftpan = channel->cha << 16;
+ channel->rightpan = channel->chb << 16;
+ }
+#endif
+}
+
+#if OPL_ENABLE_STEREOEXT
+static void OPL3_ChannelWriteD0(opl3_channel* channel, uint8_t data)
+{
+ if (channel->chip->stereoext)
+ {
+ channel->leftpan = panpot_lut[data ^ 0xff];
+ channel->rightpan = panpot_lut[data];
+ }
+}
+#endif
+
+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, uint8_t data)
+{
+ uint8_t bit;
+ uint8_t 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;
+ OPL3_ChannelUpdateAlg(&chip->channel[chnum]);
+ }
+ else
+ {
+ chip->channel[chnum].chtype = ch_2op;
+ chip->channel[chnum + 3].chtype = ch_2op;
+ OPL3_ChannelUpdateAlg(&chip->channel[chnum]);
+ OPL3_ChannelUpdateAlg(&chip->channel[chnum+3]);
+ }
+ }
+}
+
+static int16_t OPL3_ClipSample(int32_t sample)
+{
+ if (sample > 32767)
+ {
+ sample = 32767;
+ }
+ else if (sample < -32768)
+ {
+ sample = -32768;
+ }
+ return (int16_t)sample;
+}
+
+static void OPL3_ProcessSlot(opl3_slot *slot)
+{
+ OPL3_SlotCalcFB(slot);
+ OPL3_EnvelopeCalc(slot);
+ OPL3_PhaseGenerate(slot);
+ OPL3_SlotGenerate(slot);
+}
+
+inline void OPL3_Generate4Ch(opl3_chip *chip, int16_t *buf4)
+{
+ opl3_channel *channel;
+ opl3_writebuf *writebuf;
+ int16_t **out;
+ int32_t mix[2];
+ uint8_t ii;
+ int16_t accm;
+ uint8_t shift = 0;
+
+ buf4[1] = OPL3_ClipSample(chip->mixbuff[1]);
+ buf4[3] = OPL3_ClipSample(chip->mixbuff[3]);
+
+#if OPL_QUIRK_CHANNELSAMPLEDELAY
+ for (ii = 0; ii < 15; ii++)
+#else
+ for (ii = 0; ii < 36; ii++)
+#endif
+ {
+ OPL3_ProcessSlot(&chip->slot[ii]);
+ }
+
+ mix[0] = mix[1] = 0;
+ for (ii = 0; ii < 18; ii++)
+ {
+ channel = &chip->channel[ii];
+ out = channel->out;
+ accm = *out[0] + *out[1] + *out[2] + *out[3];
+#if OPL_ENABLE_STEREOEXT
+ mix[0] += (int16_t)((accm * channel->leftpan) >> 16);
+#else
+ mix[0] += (int16_t)(accm & channel->cha);
+ #endif
+ mix[1] += (int16_t)(accm & channel->chc);
+ }
+ chip->mixbuff[0] = mix[0];
+ chip->mixbuff[2] = mix[1];
+
+#if OPL_QUIRK_CHANNELSAMPLEDELAY
+ for (ii = 15; ii < 18; ii++)
+ {
+ OPL3_ProcessSlot(&chip->slot[ii]);
+ }
+#endif
+
+ buf4[0] = OPL3_ClipSample(chip->mixbuff[0]);
+ buf4[2] = OPL3_ClipSample(chip->mixbuff[2]);
+
+#if OPL_QUIRK_CHANNELSAMPLEDELAY
+ for (ii = 18; ii < 33; ii++)
+ {
+ OPL3_ProcessSlot(&chip->slot[ii]);
+ }
+#endif
+
+ mix[0] = mix[1] = 0;
+ for (ii = 0; ii < 18; ii++)
+ {
+ channel = &chip->channel[ii];
+ out = channel->out;
+ accm = *out[0] + *out[1] + *out[2] + *out[3];
+#if OPL_ENABLE_STEREOEXT
+ mix[0] += (int16_t)((accm * channel->rightpan) >> 16);
+#else
+ mix[0] += (int16_t)(accm & channel->chb);
+ #endif
+ mix[1] += (int16_t)(accm & channel->chd);
+ }
+ chip->mixbuff[1] = mix[0];
+ chip->mixbuff[3] = mix[1];
+
+#if OPL_QUIRK_CHANNELSAMPLEDELAY
+ for (ii = 33; ii < 36; ii++)
+ {
+ OPL3_ProcessSlot(&chip->slot[ii]);
+ }
+#endif
+
+ 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++;
+
+ chip->eg_add = 0;
+ if (chip->eg_timer)
+ {
+ while (shift < 36 && ((chip->eg_timer >> shift) & 1) == 0)
+ {
+ shift++;
+ }
+ if (shift > 12)
+ {
+ chip->eg_add = 0;
+ }
+ else
+ {
+ chip->eg_add = shift + 1;
+ }
+ }
+
+ if (chip->eg_timerrem || chip->eg_state)
+ {
+ if (chip->eg_timer == 0xfffffffff)
+ {
+ chip->eg_timer = 0;
+ chip->eg_timerrem = 1;
+ }
+ else
+ {
+ chip->eg_timer++;
+ chip->eg_timerrem = 0;
+ }
+ }
+
+ chip->eg_state ^= 1;
+
+ while ((writebuf = &chip->writebuf[chip->writebuf_cur]), writebuf->time <= chip->writebuf_samplecnt)
+ {
+ if (!(writebuf->reg & 0x200))
+ {
+ break;
+ }
+ writebuf->reg &= 0x1ff;
+ OPL3_WriteReg(chip, writebuf->reg, writebuf->data);
+ chip->writebuf_cur = (chip->writebuf_cur + 1) % OPL_WRITEBUF_SIZE;
+ }
+ chip->writebuf_samplecnt++;
+}
+
+void OPL3_Generate(opl3_chip *chip, int16_t *buf)
+{
+ int16_t samples[4];
+ OPL3_Generate4Ch(chip, samples);
+ buf[0] = samples[0];
+ buf[1] = samples[1];
+}
+
+void OPL3_Generate4ChResampled(opl3_chip *chip, int16_t *buf4)
+{
+ while (chip->samplecnt >= chip->rateratio)
+ {
+ chip->oldsamples[0] = chip->samples[0];
+ chip->oldsamples[1] = chip->samples[1];
+ chip->oldsamples[2] = chip->samples[2];
+ chip->oldsamples[3] = chip->samples[3];
+ OPL3_Generate4Ch(chip, chip->samples);
+ chip->samplecnt -= chip->rateratio;
+ }
+ buf4[0] = (int16_t)((chip->oldsamples[0] * (chip->rateratio - chip->samplecnt)
+ + chip->samples[0] * chip->samplecnt) / chip->rateratio);
+ buf4[1] = (int16_t)((chip->oldsamples[1] * (chip->rateratio - chip->samplecnt)
+ + chip->samples[1] * chip->samplecnt) / chip->rateratio);
+ buf4[2] = (int16_t)((chip->oldsamples[2] * (chip->rateratio - chip->samplecnt)
+ + chip->samples[2] * chip->samplecnt) / chip->rateratio);
+ buf4[3] = (int16_t)((chip->oldsamples[3] * (chip->rateratio - chip->samplecnt)
+ + chip->samples[3] * chip->samplecnt) / chip->rateratio);
+ chip->samplecnt += 1 << RSM_FRAC;
+}
+
+void OPL3_GenerateResampled(opl3_chip *chip, int16_t *buf)
+{
+ int16_t samples[4];
+ OPL3_Generate4ChResampled(chip, samples);
+ buf[0] = samples[0];
+ buf[1] = samples[1];
+}
+
+void OPL3_Reset(opl3_chip *chip, uint32_t samplerate)
+{
+ opl3_slot *slot;
+ opl3_channel *channel;
+ uint8_t slotnum;
+ uint8_t channum;
+ uint8_t local_ch_slot;
+
+ memset(chip, 0, sizeof(opl3_chip));
+ for (slotnum = 0; slotnum < 36; slotnum++)
+ {
+ slot = &chip->slot[slotnum];
+ slot->chip = chip;
+ slot->mod = &chip->zeromod;
+ slot->eg_rout = 0x1ff;
+ slot->eg_out = 0x1ff;
+ slot->eg_gen = envelope_gen_num_release;
+ slot->trem = (uint8_t*)&chip->zeromod;
+ slot->slot_num = slotnum;
+ }
+ for (channum = 0; channum < 18; channum++)
+ {
+ channel = &chip->channel[channum];
+ local_ch_slot = ch_slot[channum];
+ channel->slots[0] = &chip->slot[local_ch_slot];
+ channel->slots[1] = &chip->slot[local_ch_slot + 3];
+ chip->slot[local_ch_slot].channel = channel;
+ chip->slot[local_ch_slot + 3].channel = channel;
+ if ((channum % 9) < 3)
+ {
+ channel->pair = &chip->channel[channum + 3];
+ }
+ else if ((channum % 9) < 6)
+ {
+ channel->pair = &chip->channel[channum - 3];
+ }
+ channel->chip = chip;
+ channel->out[0] = &chip->zeromod;
+ channel->out[1] = &chip->zeromod;
+ channel->out[2] = &chip->zeromod;
+ channel->out[3] = &chip->zeromod;
+ channel->chtype = ch_2op;
+ channel->cha = 0xffff;
+ channel->chb = 0xffff;
+#if OPL_ENABLE_STEREOEXT
+ channel->leftpan = 0x10000;
+ channel->rightpan = 0x10000;
+#endif
+ channel->ch_num = channum;
+ OPL3_ChannelSetupAlg(channel);
+ }
+ chip->noise = 1;
+ chip->rateratio = (samplerate << RSM_FRAC) / 49716;
+ chip->tremoloshift = 4;
+ chip->vibshift = 1;
+
+#if OPL_ENABLE_STEREOEXT
+ if (!panpot_lut_build)
+ {
+ int32_t i;
+ for (i = 0; i < 256; i++)
+ {
+ panpot_lut[i] = OPL_SIN(i);
+ }
+ panpot_lut_build = 1;
+ }
+#endif
+}
+
+void OPL3_WriteReg(opl3_chip *chip, uint16_t reg, uint8_t v)
+{
+ uint8_t high = (reg >> 8) & 0x01;
+ uint8_t 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;
+#if OPL_ENABLE_STEREOEXT
+ chip->stereoext = (v >> 1) & 0x01;
+#endif
+ 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->slot[18 * high + ad_slot[regm & 0x1f]], v);
+ }
+ break;
+ case 0x40:
+ case 0x50:
+ if (ad_slot[regm & 0x1f] >= 0)
+ {
+ OPL3_SlotWrite40(&chip->slot[18 * high + ad_slot[regm & 0x1f]], v);
+ }
+ break;
+ case 0x60:
+ case 0x70:
+ if (ad_slot[regm & 0x1f] >= 0)
+ {
+ OPL3_SlotWrite60(&chip->slot[18 * high + ad_slot[regm & 0x1f]], v);
+ }
+ break;
+ case 0x80:
+ case 0x90:
+ if (ad_slot[regm & 0x1f] >= 0)
+ {
+ OPL3_SlotWrite80(&chip->slot[18 * high + ad_slot[regm & 0x1f]], v);
+ }
+ break;
+ case 0xe0:
+ case 0xf0:
+ if (ad_slot[regm & 0x1f] >= 0)
+ {
+ OPL3_SlotWriteE0(&chip->slot[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;
+#if OPL_ENABLE_STEREOEXT
+ case 0xd0:
+ if ((regm & 0x0f) < 9)
+ {
+ OPL3_ChannelWriteD0(&chip->channel[9 * high + (regm & 0x0f)], v);
+ }
+ break;
+#endif
+ }
+}
+
+void OPL3_WriteRegBuffered(opl3_chip *chip, uint16_t reg, uint8_t v)
+{
+ uint64_t time1, time2;
+ opl3_writebuf *writebuf;
+ uint32_t writebuf_last;
+
+ writebuf_last = chip->writebuf_last;
+ writebuf = &chip->writebuf[writebuf_last];
+
+ if (writebuf->reg & 0x200)
+ {
+ OPL3_WriteReg(chip, writebuf->reg & 0x1ff, writebuf->data);
+
+ chip->writebuf_cur = (writebuf_last + 1) % OPL_WRITEBUF_SIZE;
+ chip->writebuf_samplecnt = writebuf->time;
+ }
+
+ writebuf->reg = reg | 0x200;
+ writebuf->data = v;
+ time1 = chip->writebuf_lasttime + OPL_WRITEBUF_DELAY;
+ time2 = chip->writebuf_samplecnt;
+
+ if (time1 < time2)
+ {
+ time1 = time2;
+ }
+
+ writebuf->time = time1;
+ chip->writebuf_lasttime = time1;
+ chip->writebuf_last = (writebuf_last + 1) % OPL_WRITEBUF_SIZE;
+}
+
+void OPL3_Generate4ChStream(opl3_chip *chip, int16_t *sndptr1, int16_t *sndptr2, uint32_t numsamples)
+{
+ uint_fast32_t i;
+ int16_t samples[4];
+
+ for(i = 0; i < numsamples; i++)
+ {
+ OPL3_Generate4ChResampled(chip, samples);
+ sndptr1[0] = samples[0];
+ sndptr1[1] = samples[1];
+ sndptr2[0] = samples[2];
+ sndptr2[1] = samples[3];
+ sndptr1 += 2;
+ sndptr2 += 2;
+ }
+}
+
+void OPL3_GenerateStream(opl3_chip *chip, int16_t *sndptr, uint32_t numsamples)
+{
+ uint_fast32_t i;
+
+ for(i = 0; i < numsamples; i++)
+ {
+ OPL3_GenerateResampled(chip, sndptr);
+ sndptr += 2;
+ }
+}