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opll.c
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opll.c
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/*
* Copyright (C) 2019 Nuke.YKT
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*
* Yamaha YM2413 emulator
* Thanks:
* siliconpr0n.org(digshadow, John McMaster):
* VRC VII decap and die shot.
*
* version: 0.9
*/
#include <string.h>
#include "opll.h"
enum {
eg_num_attack = 0,
eg_num_decay = 1,
eg_num_sustain = 2,
eg_num_release = 3
};
enum {
rm_num_bd0 = 0,
rm_num_hh = 1,
rm_num_tom = 2,
rm_num_bd1 = 3,
rm_num_sd = 4,
rm_num_tc = 5
};
/* 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
};
static const opll_patch_t patch_ds1001[opll_patch_max] = {
{ 0x05, 0x00, 0x00, 0x06,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x00, 0x00 },{ 0x03, 0x01 },{ 0x00, 0x00 },{ 0x0e, 0x08 },{ 0x08, 0x01 },{ 0x04, 0x02 },{ 0x02, 0x07 } },
{ 0x14, 0x00, 0x01, 0x05,{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x03, 0x01 },{ 0x00, 0x00 },{ 0x0d, 0x0f },{ 0x08, 0x06 },{ 0x02, 0x01 },{ 0x03, 0x02 } },
{ 0x08, 0x00, 0x01, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x0f, 0x0b },{ 0x0a, 0x02 },{ 0x02, 0x01 },{ 0x00, 0x02 } },
{ 0x0c, 0x00, 0x00, 0x07,{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x01, 0x01 },{ 0x01, 0x00 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x0a, 0x06 },{ 0x08, 0x04 },{ 0x06, 0x02 },{ 0x01, 0x07 } },
{ 0x1e, 0x00, 0x00, 0x06,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x01, 0x00 },{ 0x02, 0x01 },{ 0x00, 0x00 },{ 0x0e, 0x07 },{ 0x01, 0x06 },{ 0x00, 0x02 },{ 0x01, 0x08 } },
{ 0x06, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x02, 0x01 },{ 0x00, 0x00 },{ 0x0a, 0x0e },{ 0x03, 0x02 },{ 0x0f, 0x0f },{ 0x04, 0x04 } },
{ 0x1d, 0x00, 0x00, 0x07,{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x08, 0x08 },{ 0x02, 0x01 },{ 0x01, 0x00 },{ 0x01, 0x07 } },
{ 0x22, 0x01, 0x00, 0x07,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x03, 0x01 },{ 0x00, 0x00 },{ 0x0a, 0x07 },{ 0x02, 0x02 },{ 0x00, 0x01 },{ 0x01, 0x07 } },
{ 0x25, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x01, 0x01 },{ 0x05, 0x01 },{ 0x00, 0x00 },{ 0x04, 0x07 },{ 0x00, 0x03 },{ 0x07, 0x00 },{ 0x02, 0x01 } },
{ 0x0f, 0x00, 0x01, 0x07,{ 0x01, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x01, 0x00 },{ 0x05, 0x01 },{ 0x00, 0x00 },{ 0x0a, 0x0a },{ 0x08, 0x05 },{ 0x05, 0x00 },{ 0x01, 0x02 } },
{ 0x24, 0x00, 0x00, 0x07,{ 0x00, 0x01 },{ 0x00, 0x01 },{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x07, 0x01 },{ 0x00, 0x00 },{ 0x0f, 0x0f },{ 0x08, 0x08 },{ 0x02, 0x01 },{ 0x02, 0x02 } },
{ 0x11, 0x00, 0x00, 0x06,{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x01, 0x01 },{ 0x01, 0x00 },{ 0x01, 0x03 },{ 0x00, 0x00 },{ 0x06, 0x07 },{ 0x05, 0x04 },{ 0x01, 0x01 },{ 0x08, 0x06 } },
{ 0x13, 0x00, 0x00, 0x05,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x02 },{ 0x03, 0x00 },{ 0x0c, 0x09 },{ 0x09, 0x05 },{ 0x00, 0x00 },{ 0x03, 0x02 } },
{ 0x0c, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x01, 0x03 },{ 0x00, 0x00 },{ 0x09, 0x0c },{ 0x04, 0x00 },{ 0x03, 0x0f },{ 0x03, 0x06 } },
{ 0x0d, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x01, 0x01 },{ 0x00, 0x01 },{ 0x01, 0x02 },{ 0x00, 0x00 },{ 0x0c, 0x0d },{ 0x01, 0x05 },{ 0x05, 0x00 },{ 0x06, 0x06 } },
{ 0x18, 0x00, 0x01, 0x07,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x00, 0x00 },{ 0x0d, 0x00 },{ 0x0f, 0x00 },{ 0x06, 0x00 },{ 0x0a, 0x00 } },
{ 0x00, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x00, 0x00 },{ 0x0c, 0x00 },{ 0x08, 0x00 },{ 0x0a, 0x00 },{ 0x07, 0x00 } },
{ 0x00, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x05, 0x00 },{ 0x00, 0x00 },{ 0x0f, 0x00 },{ 0x08, 0x00 },{ 0x05, 0x00 },{ 0x09, 0x00 } },
{ 0x00, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x00, 0x00 },{ 0x00, 0x0f },{ 0x00, 0x08 },{ 0x00, 0x06 },{ 0x00, 0x0d } },
{ 0x00, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x00, 0x00 },{ 0x00, 0x0d },{ 0x00, 0x08 },{ 0x00, 0x06 },{ 0x00, 0x08 } },
{ 0x00, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x00, 0x00 },{ 0x00, 0x0a },{ 0x00, 0x0a },{ 0x00, 0x05 },{ 0x00, 0x05 } }
};
static const opll_patch_t patch_ym2413[opll_patch_max] = {
{ 0x1e, 0x01, 0x00, 0x07,{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x01, 0x01 },{ 0x01, 0x00 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x0d, 0x07 },{ 0x00, 0x08 },{ 0x00, 0x01 },{ 0x00, 0x07 } },
{ 0x1a, 0x00, 0x01, 0x05,{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x03, 0x01 },{ 0x00, 0x00 },{ 0x0d, 0x0f },{ 0x08, 0x07 },{ 0x02, 0x01 },{ 0x03, 0x03 } },
{ 0x19, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x03, 0x01 },{ 0x02, 0x00 },{ 0x0f, 0x0c },{ 0x02, 0x04 },{ 0x01, 0x02 },{ 0x01, 0x03 } },
{ 0x0e, 0x00, 0x00, 0x07,{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x01, 0x01 },{ 0x01, 0x00 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x0a, 0x06 },{ 0x08, 0x04 },{ 0x07, 0x02 },{ 0x00, 0x07 } },
{ 0x1e, 0x00, 0x00, 0x06,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x01, 0x00 },{ 0x02, 0x01 },{ 0x00, 0x00 },{ 0x0e, 0x07 },{ 0x00, 0x06 },{ 0x00, 0x02 },{ 0x00, 0x08 } },
{ 0x16, 0x00, 0x00, 0x05,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x01, 0x00 },{ 0x01, 0x02 },{ 0x00, 0x00 },{ 0x0e, 0x07 },{ 0x00, 0x01 },{ 0x00, 0x01 },{ 0x00, 0x08 } },
{ 0x1d, 0x00, 0x00, 0x07,{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x08, 0x08 },{ 0x02, 0x01 },{ 0x01, 0x00 },{ 0x00, 0x07 } },
{ 0x2d, 0x01, 0x00, 0x04,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x03, 0x01 },{ 0x00, 0x00 },{ 0x0a, 0x07 },{ 0x02, 0x02 },{ 0x00, 0x00 },{ 0x00, 0x07 } },
{ 0x1b, 0x00, 0x00, 0x06,{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x06, 0x06 },{ 0x04, 0x05 },{ 0x01, 0x01 },{ 0x00, 0x07 } },
{ 0x0b, 0x01, 0x01, 0x00,{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x00, 0x01 },{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x00, 0x00 },{ 0x08, 0x0f },{ 0x05, 0x07 },{ 0x07, 0x00 },{ 0x01, 0x07 } },
{ 0x03, 0x01, 0x00, 0x01,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x03, 0x01 },{ 0x02, 0x00 },{ 0x0f, 0x0e },{ 0x0a, 0x04 },{ 0x01, 0x00 },{ 0x00, 0x04 } },
{ 0x24, 0x00, 0x00, 0x07,{ 0x00, 0x01 },{ 0x00, 0x01 },{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x07, 0x01 },{ 0x00, 0x00 },{ 0x0f, 0x0f },{ 0x08, 0x08 },{ 0x02, 0x01 },{ 0x02, 0x02 } },
{ 0x0c, 0x00, 0x00, 0x05,{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x01, 0x00 },{ 0x00, 0x01 },{ 0x01, 0x00 },{ 0x00, 0x00 },{ 0x0c, 0x0f },{ 0x02, 0x05 },{ 0x02, 0x04 },{ 0x00, 0x02 } },
{ 0x15, 0x00, 0x00, 0x03,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x01, 0x00 },{ 0x0c, 0x09 },{ 0x09, 0x05 },{ 0x00, 0x00 },{ 0x03, 0x02 } },
{ 0x09, 0x00, 0x00, 0x03,{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x01, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x01 },{ 0x02, 0x00 },{ 0x0f, 0x0e },{ 0x01, 0x04 },{ 0x04, 0x01 },{ 0x00, 0x03 } },
{ 0x18, 0x00, 0x01, 0x07,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x00, 0x00 },{ 0x0d, 0x00 },{ 0x0f, 0x00 },{ 0x06, 0x00 },{ 0x0a, 0x00 } },
{ 0x00, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x01, 0x00 },{ 0x00, 0x00 },{ 0x0c, 0x00 },{ 0x08, 0x00 },{ 0x0a, 0x00 },{ 0x07, 0x00 } },
{ 0x00, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x05, 0x00 },{ 0x00, 0x00 },{ 0x0f, 0x00 },{ 0x08, 0x00 },{ 0x05, 0x00 },{ 0x09, 0x00 } },
{ 0x00, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x00, 0x00 },{ 0x00, 0x0f },{ 0x00, 0x08 },{ 0x00, 0x06 },{ 0x00, 0x0d } },
{ 0x00, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x00, 0x00 },{ 0x00, 0x0d },{ 0x00, 0x08 },{ 0x00, 0x04 },{ 0x00, 0x08 } },
{ 0x00, 0x00, 0x00, 0x00,{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x00 },{ 0x00, 0x01 },{ 0x00, 0x00 },{ 0x00, 0x0a },{ 0x00, 0x0a },{ 0x00, 0x05 },{ 0x00, 0x05 } }
};
static const uint32_t ch_offset[18] = {
1, 2, 0, 1, 2, 3, 4, 5, 3, 4, 5, 6, 7, 8, 6, 7, 8, 0
};
static const uint32_t pg_multi[16] = {
1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 20, 24, 24, 30, 30
};
static const uint32_t eg_stephi[4][4] = {
{ 0, 0, 0, 0 },
{ 1, 0, 0, 0 },
{ 1, 0, 1, 0 },
{ 1, 1, 1, 0 }
};
static const uint32_t eg_ksltable[16] = {
0, 32, 40, 45, 48, 51, 53, 55, 56, 58, 59, 60, 61, 62, 63, 64
};
void OPLL_DoIO(opll_t *chip) {
/* Write signal check */
chip->write_a_en = (chip->write_a & 0x03) == 0x01;
chip->write_d_en = (chip->write_d & 0x03) == 0x01;
chip->write_a <<= 1;
chip->write_d <<= 1;
}
void OPLL_DoModeWrite(opll_t *chip) {
uint8_t slot;
if ((chip->write_mode_address & 0x10) && chip->write_d_en) {
slot = chip->write_mode_address & 0x01;
switch (chip->write_mode_address & 0x0f) {
case 0x00:
case 0x01:
chip->patch.multi[slot] = chip->write_data & 0x0f;
chip->patch.ksr[slot] = (chip->write_data >> 4) & 0x01;
chip->patch.et[slot] = (chip->write_data >> 5) & 0x01;
chip->patch.vib[slot] = (chip->write_data >> 6) & 0x01;
chip->patch.am[slot] = (chip->write_data >> 7) & 0x01;
break;
case 0x02:
chip->patch.ksl[0] = (chip->write_data >> 6) & 0x03;
chip->patch.tl = chip->write_data & 0x3f;
break;
case 0x03:
chip->patch.ksl[1] = (chip->write_data >> 6) & 0x03;
chip->patch.dc = (chip->write_data >> 4) & 0x01;
chip->patch.dm = (chip->write_data >> 3) & 0x01;
chip->patch.fb = chip->write_data & 0x07;
break;
case 0x04:
case 0x05:
chip->patch.dr[slot] = chip->write_data & 0x0f;
chip->patch.ar[slot] = (chip->write_data >> 4) & 0x0f;
break;
case 0x06:
case 0x07:
chip->patch.rr[slot] = chip->write_data & 0x0f;
chip->patch.sl[slot] = (chip->write_data >> 4) & 0x0f;
break;
case 0x0e:
chip->rhythm = chip->write_data & 0x3f;
if (chip->chip_type == opll_type_ds1001) {
chip->rhythm |= 0x20;
}
chip->rm_enable = (chip->rm_enable & 0x7f) | ((chip->rhythm << 2) & 0x80);
break;
case 0x0f:
chip->testmode = chip->write_data & 0x0f;
break;
}
}
}
void OPLL_Reset(opll_t *chip, uint32_t chip_type) {
uint32_t i;
memset(chip, 0, sizeof(opll_t));
chip->chip_type = chip_type;
if (chip_type == opll_type_ds1001) {
/* Rhythm mode is always on */
chip->rhythm = 0x20;
chip->rm_enable = (int8_t)0x80;
}
switch (chip_type) {
case opll_type_ds1001:
chip->patchrom = patch_ds1001;
break;
case opll_type_ym2413:
case opll_type_ym2413b:
default:
chip->patchrom = patch_ym2413;
break;
}
for (i = 0; i < 18; i++) {
chip->eg_state[i] = eg_num_release;
chip->eg_level[i] = 0x7f;
chip->eg_out = 0x7f;
}
chip->rm_select = rm_num_tc + 1;
}
void OPLL_DoRegWrite(opll_t *chip) {
uint32_t channel;
/* Address */
if (chip->write_a_en) {
if ((chip->write_data & 0xc0) == 0x00) {
/* FM Write */
chip->write_fm_address = 1;
chip->address = chip->write_data;
} else {
chip->write_fm_address = 0;
}
}
/* Data */
if (chip->write_fm_address && chip->write_d_en) {
chip->data = chip->write_data;
}
/* Update registers */
if (chip->write_fm_data && !chip->write_a_en) {
if ((chip->address & 0x0f) == chip->cycles && chip->cycles < 16) {
channel = chip->cycles % 9;
switch (chip->address & 0xf0) {
case 0x10:
chip->fnum[channel] = (chip->fnum[channel] & 0x100) | chip->data;
break;
case 0x20:
chip->fnum[channel] = (chip->fnum[channel] & 0xff) | ((chip->data & 0x01) << 8);
chip->block[channel] = (chip->data >> 1) & 0x07;
chip->kon[channel] = (chip->data >> 4) & 0x01;
chip->son[channel] = (chip->data >> 5) & 0x01;
break;
case 0x30:
chip->vol[channel] = chip->data & 0x0f;
chip->inst[channel] = (chip->data >> 4) & 0x0f;
break;
}
}
}
if (chip->write_a_en) {
chip->write_fm_data = 0;
}
if (chip->write_fm_address && chip->write_d_en) {
chip->write_fm_data = 1;
}
if (chip->write_a_en) {
if (((chip->write_data & 0xf0) == 0x00)) {
chip->write_mode_address = 0x10 | (chip->write_data & 0x0f);
} else {
chip->write_mode_address = 0x00;
}
}
}
void OPLL_PreparePatch1(opll_t *chip) {
uint8_t instr;
uint32_t mcsel = ((chip->cycles + 1) / 3) & 0x01;
uint32_t instr_index;
uint32_t ch = ch_offset[chip->cycles];
const opll_patch_t *patch;
instr = chip->inst[ch];
if (instr > 0) {
instr_index = opll_patch_1 + instr - 1;
}
if (chip->rm_select <= rm_num_tc) {
instr_index = opll_patch_drum_0 + chip->rm_select;
}
if (chip->rm_select <= rm_num_tc || instr > 0) {
patch = &chip->patchrom[instr_index];
} else {
patch = &chip->patch;
}
if (chip->rm_select == rm_num_hh || chip->rm_select == rm_num_tom) {
chip->c_tl = chip->inst[ch] << 2;
} else if (mcsel == 1) {
chip->c_tl = chip->vol[ch] << 2;
} else {
chip->c_tl = patch->tl;
}
chip->c_adrr[0] = patch->ar[mcsel];
chip->c_adrr[1] = patch->dr[mcsel];
chip->c_adrr[2] = patch->rr[mcsel];
chip->c_et = patch->et[mcsel];
chip->c_ksr = patch->ksr[mcsel];
chip->c_ksl = patch->ksl[mcsel];
chip->c_ksr_freq = (chip->block[ch] << 1) | (chip->fnum[ch] >> 8);
chip->c_ksl_freq = (chip->fnum[ch]>>5);
chip->c_ksl_block = (chip->block[ch]);
}
void OPLL_PreparePatch2(opll_t *chip) {
uint8_t instr;
uint32_t mcsel = ((chip->cycles + 1) / 3) & 0x01;
uint32_t instr_index;
const opll_patch_t *patch;
instr = chip->inst[ch_offset[chip->cycles]];
if (instr > 0) {
instr_index = opll_patch_1 + instr - 1;
}
if (chip->rm_select <= rm_num_tc) {
instr_index = opll_patch_drum_0 + chip->rm_select;
}
if (chip->rm_select <= rm_num_tc || instr > 0) {
patch = &chip->patchrom[instr_index];
} else {
patch = &chip->patch;
}
chip->c_fnum = chip->fnum[ch_offset[chip->cycles]];
chip->c_block = chip->block[ch_offset[chip->cycles]];
chip->c_multi = patch->multi[mcsel];
chip->c_sl = patch->sl[mcsel];
chip->c_fb = patch->fb;
chip->c_vib = patch->vib[mcsel];
chip->c_am = patch->am[mcsel];
chip->c_dc <<= 1;
chip->c_dm <<= 1;
chip->c_dc |= patch->dc;
chip->c_dm |= patch->dm;
}
void OPLL_PhaseGenerate(opll_t *chip) {
uint32_t ismod;
uint32_t phase;
uint8_t rm_bit;
uint16_t pg_out;
chip->pg_phase[(chip->cycles + 17) % 18] = chip->pg_phase_next + chip->pg_inc;
if ((chip->rm_enable & 0x40) && (chip->cycles == 13 || chip->cycles == 14)) {
ismod = 0;
} else {
ismod = ((chip->cycles + 3) / 3) & 1;
}
phase = chip->pg_phase[chip->cycles];
/* KeyOn event check */
if ((chip->testmode & 0x04)
|| (ismod && (chip->eg_dokon & 0x8000)) || (!ismod && (chip->eg_dokon & 0x01))) {
chip->pg_phase_next = 0;
} else {
chip->pg_phase_next = phase;
}
/* Rhythm mode */
if (chip->cycles == 13) {
chip->rm_hh_bit2 = (phase >> (2 + 9)) & 1;
chip->rm_hh_bit3 = (phase >> (3 + 9)) & 1;
chip->rm_hh_bit7 = (phase >> (7 + 9)) & 1;
chip->rm_hh_bit8 = (phase >> (8 + 9)) & 1;
} else if (chip->cycles == 17 && (chip->rm_enable & 0x80)) {
chip->rm_tc_bit3 = (phase >> (3 + 9)) & 1;
chip->rm_tc_bit5 = (phase >> (5 + 9)) & 1;
}
if ((chip->rm_enable & 0x80)) {
switch (chip->cycles) {
case 13:
/* HH */
rm_bit = (chip->rm_hh_bit2 ^ chip->rm_hh_bit7)
| (chip->rm_hh_bit3 ^ chip->rm_tc_bit5)
| (chip->rm_tc_bit3 ^ chip->rm_tc_bit5);
pg_out = rm_bit << 9;
if (rm_bit ^ (chip->rm_noise & 1)) {
pg_out |= 0xd0;
} else {
pg_out |= 0x34;
}
break;
case 16:
/* SD */
pg_out = (chip->rm_hh_bit8 << 9)
| ((chip->rm_hh_bit8 ^ (chip->rm_noise & 1)) << 8);
break;
case 17:
/* TC */
rm_bit = (chip->rm_hh_bit2 ^ chip->rm_hh_bit7)
| (chip->rm_hh_bit3 ^ chip->rm_tc_bit5)
| (chip->rm_tc_bit3 ^ chip->rm_tc_bit5);
pg_out = (rm_bit << 9) | 0x100;
break;
default:
pg_out = phase >> 9;
}
} else {
pg_out = phase >> 9;
}
chip->pg_out = pg_out;
}
void OPLL_PhaseCalcIncrement(opll_t *chip) {
uint32_t freq;
uint16_t block;
freq = chip->c_fnum << 1;
block = chip->c_block;
/* Apply vibrato */
if (chip->c_vib) {
switch (chip->lfo_vib_counter) {
case 0:
case 4:
break;
case 1:
case 3:
freq += freq >> 8;
break;
case 2:
freq += freq >> 7;
break;
case 5:
case 7:
freq -= freq >> 8;
break;
case 6:
freq -= freq >> 7;
break;
}
}
/* Apply block */
freq = (freq << block) >> 1;
chip->pg_inc = (freq * pg_multi[chip->c_multi]) >> 1;
}
void OPLL_EnvelopeKSLTL(opll_t *chip)
{
int32_t ksl;
ksl = eg_ksltable[chip->c_ksl_freq]-((8-chip->c_ksl_block)<<3);
if (ksl < 0) {
ksl = 0;
}
ksl <<= 1;
if (chip->c_ksl) {
ksl = ksl >> (3-chip->c_ksl);
} else {
ksl = 0;
}
chip->eg_ksltl = ksl + (chip->c_tl<<1);
}
void OPLL_EnvelopeOutput(opll_t *chip)
{
int32_t level = chip->eg_level[(chip->cycles+17)%18];
level += chip->eg_ksltl;
if (chip->c_am) {
level += chip->lfo_am_out;
}
if (level >= 128) {
level = 127;
}
if (chip->testmode & 0x01) {
level = 0;
}
chip->eg_out = level;
}
void OPLL_EnvelopeGenerate(opll_t *chip) {
uint8_t timer_inc;
uint8_t timer_bit;
uint8_t timer_low;
uint8_t rate;
uint8_t state_rate;
uint8_t ksr;
uint8_t sum;
uint8_t rate_hi;
uint8_t rate_lo;
int32_t level;
int32_t next_level;
uint8_t zero;
uint8_t state;
uint8_t next_state;
int32_t step;
int32_t sl;
uint32_t mcsel = ((chip->cycles + 1) / 3) & 0x01;
/* EG timer */
if ((chip->eg_counter_state & 3) != 3) {
timer_inc = 0;
} else if (chip->cycles == 0) {
timer_inc = 1;
} else {
timer_inc = chip->eg_timer_carry;
}
timer_low = chip->eg_timer & 3;
timer_bit = chip->eg_timer & 1;
timer_bit += timer_inc;
chip->eg_timer_carry = timer_bit >> 1;
chip->eg_timer = ((timer_bit & 1) << 17) | (chip->eg_timer >> 1);
if (chip->testmode & 0x08) {
chip->eg_timer &= 0x2ffff;
chip->eg_timer |= (chip->write_data << (16 - 2)) & 0x10000;
}
if (!chip->eg_timer_shift_stop && ((chip->eg_timer >> 16) & 1)) {
chip->eg_timer_shift = chip->cycles;
}
if (chip->cycles == 0 && (chip->eg_counter_state_prev & 1) == 1) {
chip->eg_timer_low_lock = timer_low;
chip->eg_timer_shift_lock = chip->eg_timer_shift;
if (chip->eg_timer_shift_lock > 13)
chip->eg_timer_shift_lock = 0;
chip->eg_timer_shift = 0;
}
chip->eg_timer_shift_stop |= (chip->eg_timer >> 16) & 1;
if (chip->cycles == 0) {
chip->eg_timer_shift_stop = 0;
}
chip->eg_counter_state_prev = chip->eg_counter_state;
if (chip->cycles == 17) {
chip->eg_counter_state++;
}
level = chip->eg_level[(chip->cycles+16)%18];
next_level = level;
zero = level == 0;
chip->eg_silent = level == 0x7f;
if (chip->eg_state[(chip->cycles+16)%18] != eg_num_attack && (chip->eg_off&2) && !(chip->eg_dokon&2)) {
next_level = 0x7f;
}
if (chip->eg_maxrate && (chip->eg_dokon&2)) {
next_level = 0x00;
}
state = chip->eg_state[(chip->cycles+16)%18];
next_state = eg_num_attack;
step = 0;
sl = chip->eg_sl;
switch (state) {
case eg_num_attack:
if (!chip->eg_maxrate && (chip->eg_kon & 2) && !zero) {
int32_t shift = chip->eg_rate_hi - 11 + chip->eg_inc_hi;
if (chip->eg_inc_lo) {
shift = 1;
}
if (shift > 0) {
if (shift > 4)
shift = 4;
step = ~level >> (5 - shift);
}
}
if (zero) {
next_state = eg_num_decay;
} else {
next_state = eg_num_attack;
}
break;
case eg_num_decay:
if (!(chip->eg_off & 2) && !(chip->eg_dokon & 2) && (level >> 3) != sl)
{
uint8_t i0 = chip->eg_rate_hi == 15 || (chip->eg_rate_hi == 14 && chip->eg_inc_hi);
uint8_t i1 = (chip->eg_rate_hi == 14 && !chip->eg_inc_hi) || (chip->eg_rate_hi == 13 && chip->eg_inc_hi) ||
(chip->eg_rate_hi == 13 && !chip->eg_inc_hi && (chip->eg_counter_state_prev & 1))
|| (chip->eg_rate_hi == 12 && chip->eg_inc_hi && (chip->eg_counter_state_prev & 1))
|| (chip->eg_rate_hi == 12 && !chip->eg_inc_hi && ((chip->eg_counter_state_prev & 3) == 3))
|| (chip->eg_inc_lo && ((chip->eg_counter_state_prev & 3) == 3));
step = (i0<<1) | i1;
}
if ((level >> 3) == sl) {
next_state = eg_num_sustain;
} else {
next_state = eg_num_decay;
}
break;
case eg_num_sustain:
case eg_num_release:
if (!(chip->eg_off & 2) && !(chip->eg_dokon & 2))
{
uint8_t i0 = chip->eg_rate_hi == 15 || (chip->eg_rate_hi == 14 && chip->eg_inc_hi);
uint8_t i1 = (chip->eg_rate_hi == 14 && !chip->eg_inc_hi) || (chip->eg_rate_hi == 13 && chip->eg_inc_hi) ||
(chip->eg_rate_hi == 13 && !chip->eg_inc_hi && (chip->eg_counter_state_prev & 1))
|| (chip->eg_rate_hi == 12 && chip->eg_inc_hi && (chip->eg_counter_state_prev & 1))
|| (chip->eg_rate_hi == 12 && !chip->eg_inc_hi && ((chip->eg_counter_state_prev & 3) == 3))
|| (chip->eg_inc_lo && ((chip->eg_counter_state_prev & 3) == 3));
step = (i0<<1) | i1;
}
next_state = state;
break;
}
if (!(chip->eg_kon & 2)) {
next_state = eg_num_release;
}
if (chip->eg_dokon & 2) {
next_state = eg_num_attack;
}
chip->eg_level[(chip->cycles+16)%18] = next_level+step;
chip->eg_state[(chip->cycles+16)%18] = next_state;
rate_hi = chip->eg_rate >> 2;
rate_lo = chip->eg_rate & 3;
chip->eg_inc_hi = eg_stephi[rate_lo][chip->eg_timer_low_lock];
sum = (chip->eg_timer_shift_lock + rate_hi) & 0x0f;
chip->eg_inc_lo = 0;
if (rate_hi < 12 && !chip->eg_zerorate) {
switch (sum) {
case 12:
chip->eg_inc_lo = 1;
break;
case 13:
chip->eg_inc_lo = (rate_lo >> 1) & 1;
break;
case 14:
chip->eg_inc_lo = rate_lo & 1;
break;
}
}
chip->eg_maxrate = rate_hi == 0x0f;
chip->eg_rate_hi = rate_hi;
chip->eg_kon <<= 1;
chip->eg_kon |= chip->kon[ch_offset[chip->cycles]];
chip->eg_off <<= 1;
chip->eg_off |= (chip->eg_level[chip->cycles] >> 2) == 0x1f;
switch (chip->rm_select) {
case rm_num_bd0:
case rm_num_bd1:
chip->eg_kon |= (chip->rhythm >> 4) & 1;
break;
case rm_num_sd:
chip->eg_kon |= (chip->rhythm >> 3) & 1;
break;
case rm_num_tom:
chip->eg_kon |= (chip->rhythm >> 2) & 1;
break;
case rm_num_tc:
chip->eg_kon |= (chip->rhythm >> 1) & 1;
break;
case rm_num_hh:
chip->eg_kon |= chip->rhythm & 1;
break;
}
/* Calculate rate */
rate = 0;
chip->eg_dokon <<= 1;
state_rate = chip->eg_state[chip->cycles];
if (state_rate == eg_num_release && (chip->eg_kon&1) && (chip->eg_off&1)) {
state_rate = eg_num_attack;
chip->eg_dokon |= 1;
}
switch (state_rate) {
case eg_num_attack:
rate = chip->c_adrr[0];
break;
case eg_num_decay:
rate = chip->c_adrr[1];
break;
case eg_num_sustain:
if (!chip->c_et) {
rate = chip->c_adrr[2];
}
break;
case eg_num_release:
if (chip->son[ch_offset[chip->cycles]]) {
rate = 5;
} else {
rate = chip->c_adrr[2];
}
break;
}
if (!(chip->eg_kon&1) && !mcsel && chip->rm_select != rm_num_tom && chip->rm_select != rm_num_hh) {
rate = 0;
}
if ((chip->eg_kon&1) && chip->eg_state[chip->cycles] == eg_num_release && !(chip->eg_off&1)) {
rate = 12;
}
if (!(chip->eg_kon&1) && !chip->son[ch_offset[chip->cycles]] && mcsel == 1 && !chip->c_et) {
rate = 7;
}
chip->eg_zerorate = rate == 0;
ksr = chip->c_ksr_freq;
if (!chip->c_ksr)
ksr >>= 2;
chip->eg_rate = (rate << 2) + ksr;
if (chip->eg_rate & 0x40) {
chip->eg_rate = 0x3c | (ksr & 3);
}
chip->eg_sl = chip->c_sl;
}
void OPLL_Channel(opll_t *chip) {
int16_t sign;
int16_t ch_out = chip->ch_out;
uint8_t ismod = (chip->cycles / 3) & 1;
uint8_t mute_m = ismod || ((chip->rm_enable&0x40) && (chip->cycles+15)%18 >= 12);
uint8_t mute_r = 1;
if (chip->chip_type == opll_type_ds1001) {
chip->output_m = ch_out;
if (chip->output_m >= 0) {
chip->output_m++;
}
if (mute_m) {
chip->output_m = 0;
}
chip->output_r = 0;
return;
} else {
/* TODO: This might be incorrect */
if ((chip->rm_enable & 0x40)) {
switch (chip->cycles) {
case 16: /* HH */
case 17: /* TOM */
case 0: /* BD */
case 1: /* SD */
case 2: /* TC */
case 3: /* HH */
case 4: /* TOM */
case 5: /* BD */
case 9: /* TOM */
case 10: /* TOM */
mute_r = 0;
break;
}
}
if (chip->chip_type == opll_type_ym2413b) {
if (mute_m)
chip->output_m = 0;
else
chip->output_m = ch_out;
if (mute_r)
chip->output_r = 0;
else
chip->output_r = ch_out;
} else {
sign = ch_out >> 8;
if (ch_out >= 0) {
ch_out++;
sign++;
}
if (mute_m)
chip->output_m = sign;
else
chip->output_m = ch_out;
if (mute_r)
chip->output_r = sign;
else
chip->output_r = ch_out;
}
}
}
void OPLL_Operator(opll_t *chip) {
uint8_t ismod1, ismod2, ismod3;
uint32_t op_mod;
uint16_t exp_shift;
int16_t output;
uint32_t level;
uint32_t phase;
int16_t routput;
if ((chip->rm_enable & 0x80) && (chip->cycles == 15 || chip->cycles == 16)) {
ismod1 = 0;
} else {
ismod1 = ((chip->cycles + 1) / 3) & 1;
}
if ((chip->rm_enable & 0x40) && (chip->cycles == 13 || chip->cycles == 14)) {
ismod2 = 0;
} else {
ismod2 = ((chip->cycles + 3) / 3) & 1;
}
if ((chip->rm_enable & 0x40) && (chip->cycles == 16 || chip->cycles == 17)) {
ismod3 = 0;
} else {
ismod3 = (chip->cycles / 3) & 1;
}
op_mod = 0;
if (ismod3) {
op_mod |= chip->op_mod << 1;
}
if (ismod2 && chip->c_fb) {
op_mod |= chip->op_fbsum >> (7 - chip->c_fb);
}
exp_shift = chip->op_exp_s;
if (chip->eg_silent || ((chip->op_neg&2) && (ismod1 ? (chip->c_dm&4) : (chip->c_dc&4)))) {
exp_shift |= 12;
}
output = chip->op_exp_m>>exp_shift;
if (!chip->eg_silent && (chip->op_neg&2)) {
output = ~output;
}
level = chip->op_logsin+(chip->eg_out<<4);
if (level >= 4096) {
level = 4095;
}
chip->op_exp_m = exprom[level & 0xff];
chip->op_exp_s = level >> 8;
phase = (op_mod + chip->pg_out) & 0x3ff;
if (phase & 0x100) {
phase ^= 0xff;
}
chip->op_logsin = logsinrom[phase & 0xff];
chip->op_neg <<= 1;
chip->op_neg |= phase >> 9;
chip->op_fbsum = (chip->op_fb1[(chip->cycles + 3) % 9] + chip->op_fb2[(chip->cycles + 3) % 9]) >> 1;
if (ismod1) {
chip->op_fb2[chip->cycles%9] = chip->op_fb1[chip->cycles%9];
chip->op_fb1[chip->cycles%9] = output;
}
chip->op_mod = output&0x1ff;
if (chip->chip_type == opll_type_ds1001) {
routput = 0;
} else {
switch (chip->cycles) {
case 2:
routput = chip->ch_out_hh;
break;
case 3:
routput = chip->ch_out_tm;
break;
case 4:
routput = chip->ch_out_bd;
break;
case 8:
routput = chip->ch_out_sd;
break;
case 9:
routput = chip->ch_out_tc;
break;
default:
routput = 0; /* TODO: Not quite true */
break;
}
switch (chip->cycles) {
case 15:
chip->ch_out_hh = output>>3;
break;
case 16:
chip->ch_out_tm = output>>3;
break;
case 17:
chip->ch_out_bd = output>>3;
break;
case 0:
chip->ch_out_sd = output>>3;
break;
case 1:
chip->ch_out_tc = output>>3;
break;
default:
break;
}
}
chip->ch_out = ismod1 ? routput : (output>>3);
}
void OPLL_DoRhythm(opll_t *chip) {
uint8_t nbit;
/* Noise */
nbit = (chip->rm_noise ^ (chip->rm_noise >> 14)) & 0x01;
nbit |= (chip->rm_noise == 0x00) | ((chip->testmode >> 1) & 0x01);
chip->rm_noise = (nbit << 22) | (chip->rm_noise >> 1);
}
void OPLL_DoLFO(opll_t *chip) {
uint8_t vib_step;
uint8_t am_inc = 0;
uint8_t am_bit;
/* Update counter */
if (chip->cycles == 17) {
vib_step = ((chip->lfo_counter & 0x3ff) + 1) >> 10;
chip->lfo_am_step = ((chip->lfo_counter & 0x3f) + 1) >> 6;
vib_step |= (chip->testmode >> 3) & 0x01;
chip->lfo_vib_counter += vib_step;
chip->lfo_vib_counter &= 0x07;
chip->lfo_counter++;
}
/* LFO AM */
if ((chip->lfo_am_step || (chip->testmode & 0x08)) && chip->cycles < 9) {
am_inc = chip->lfo_am_dir | (chip->cycles == 0);
}
if (chip->cycles >= 9) {
chip->lfo_am_car = 0;
}
if (chip->cycles == 0) {
if (chip->lfo_am_dir && (chip->lfo_am_counter & 0x7f) == 0) {
chip->lfo_am_dir = 0;
} else if (!chip->lfo_am_dir && (chip->lfo_am_counter & 0x69) == 0x69) {
chip->lfo_am_dir = 1;
}
}
am_bit = chip->lfo_am_counter & 0x01;
am_bit += am_inc + chip->lfo_am_car;
chip->lfo_am_car = am_bit >> 1;
am_bit &= 0x01;
chip->lfo_am_counter = (am_bit << 8) | (chip->lfo_am_counter >> 1);
/* Reset LFO */
if (chip->testmode & 0x02) {
chip->lfo_vib_counter = 0;
chip->lfo_counter = 0;
chip->lfo_am_dir = 0;
chip->lfo_am_counter &= 0xff;
}
}