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718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
704 lines
19 KiB
C++
704 lines
19 KiB
C++
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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#include "Spc_Dsp.h"
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#include "blargg_endian.h"
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#include <string.h>
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/* Copyright (C) 2007 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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details. You should have received a copy of the GNU Lesser General Public
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License along with this module; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "blargg_source.h"
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#ifdef BLARGG_ENABLE_OPTIMIZER
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#include BLARGG_ENABLE_OPTIMIZER
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#endif
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#if INT_MAX < 0x7FFFFFFF
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#error "Requires that int type have at least 32 bits"
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#endif
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// TODO: add to blargg_endian.h
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#define GET_LE16SA( addr ) ((int16_t) GET_LE16( addr ))
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#define GET_LE16A( addr ) GET_LE16( addr )
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#define SET_LE16A( addr, data ) SET_LE16( addr, data )
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static uint8_t const initial_regs [Spc_Dsp::register_count] =
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{
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0x45,0x8B,0x5A,0x9A,0xE4,0x82,0x1B,0x78,0x00,0x00,0xAA,0x96,0x89,0x0E,0xE0,0x80,
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0x2A,0x49,0x3D,0xBA,0x14,0xA0,0xAC,0xC5,0x00,0x00,0x51,0xBB,0x9C,0x4E,0x7B,0xFF,
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0xF4,0xFD,0x57,0x32,0x37,0xD9,0x42,0x22,0x00,0x00,0x5B,0x3C,0x9F,0x1B,0x87,0x9A,
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0x6F,0x27,0xAF,0x7B,0xE5,0x68,0x0A,0xD9,0x00,0x00,0x9A,0xC5,0x9C,0x4E,0x7B,0xFF,
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0xEA,0x21,0x78,0x4F,0xDD,0xED,0x24,0x14,0x00,0x00,0x77,0xB1,0xD1,0x36,0xC1,0x67,
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0x52,0x57,0x46,0x3D,0x59,0xF4,0x87,0xA4,0x00,0x00,0x7E,0x44,0x9C,0x4E,0x7B,0xFF,
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0x75,0xF5,0x06,0x97,0x10,0xC3,0x24,0xBB,0x00,0x00,0x7B,0x7A,0xE0,0x60,0x12,0x0F,
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0xF7,0x74,0x1C,0xE5,0x39,0x3D,0x73,0xC1,0x00,0x00,0x7A,0xB3,0xFF,0x4E,0x7B,0xFF
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};
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// if ( io < -32768 ) io = -32768;
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// if ( io > 32767 ) io = 32767;
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#define CLAMP16( io )\
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{\
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if ( (int16_t) io != io )\
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io = (io >> 31) ^ 0x7FFF;\
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}
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// Access global DSP register
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#define REG(n) m.regs [r_##n]
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// Access voice DSP register
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#define VREG(r,n) r [v_##n]
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#define WRITE_SAMPLES( l, r, out ) \
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{\
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out [0] = l;\
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out [1] = r;\
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out += 2;\
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if ( out >= m.out_end )\
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{\
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check( out == m.out_end );\
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check( m.out_end != &m.extra [extra_size] || \
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(m.extra <= m.out_begin && m.extra < &m.extra [extra_size]) );\
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out = m.extra;\
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m.out_end = &m.extra [extra_size];\
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}\
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}\
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void Spc_Dsp::set_output( sample_t* out, int size )
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{
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require( (size & 1) == 0 ); // must be even
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if ( !out )
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{
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out = m.extra;
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size = extra_size;
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}
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m.out_begin = out;
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m.out = out;
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m.out_end = out + size;
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}
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// Volume registers and efb are signed! Easy to forget int8_t cast.
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// Prefixes are to avoid accidental use of locals with same names.
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// Interleved gauss table (to improve cache coherency)
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// interleved_gauss [i] = gauss [(i & 1) * 256 + 255 - (i >> 1 & 0xFF)]
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static short const interleved_gauss [512] =
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{
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370,1305, 366,1305, 362,1304, 358,1304, 354,1304, 351,1304, 347,1304, 343,1303,
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339,1303, 336,1303, 332,1302, 328,1302, 325,1301, 321,1300, 318,1300, 314,1299,
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311,1298, 307,1297, 304,1297, 300,1296, 297,1295, 293,1294, 290,1293, 286,1292,
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283,1291, 280,1290, 276,1288, 273,1287, 270,1286, 267,1284, 263,1283, 260,1282,
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257,1280, 254,1279, 251,1277, 248,1275, 245,1274, 242,1272, 239,1270, 236,1269,
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233,1267, 230,1265, 227,1263, 224,1261, 221,1259, 218,1257, 215,1255, 212,1253,
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210,1251, 207,1248, 204,1246, 201,1244, 199,1241, 196,1239, 193,1237, 191,1234,
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188,1232, 186,1229, 183,1227, 180,1224, 178,1221, 175,1219, 173,1216, 171,1213,
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168,1210, 166,1207, 163,1205, 161,1202, 159,1199, 156,1196, 154,1193, 152,1190,
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150,1186, 147,1183, 145,1180, 143,1177, 141,1174, 139,1170, 137,1167, 134,1164,
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132,1160, 130,1157, 128,1153, 126,1150, 124,1146, 122,1143, 120,1139, 118,1136,
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117,1132, 115,1128, 113,1125, 111,1121, 109,1117, 107,1113, 106,1109, 104,1106,
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102,1102, 100,1098, 99,1094, 97,1090, 95,1086, 94,1082, 92,1078, 90,1074,
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89,1070, 87,1066, 86,1061, 84,1057, 83,1053, 81,1049, 80,1045, 78,1040,
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77,1036, 76,1032, 74,1027, 73,1023, 71,1019, 70,1014, 69,1010, 67,1005,
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66,1001, 65, 997, 64, 992, 62, 988, 61, 983, 60, 978, 59, 974, 58, 969,
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56, 965, 55, 960, 54, 955, 53, 951, 52, 946, 51, 941, 50, 937, 49, 932,
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48, 927, 47, 923, 46, 918, 45, 913, 44, 908, 43, 904, 42, 899, 41, 894,
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40, 889, 39, 884, 38, 880, 37, 875, 36, 870, 36, 865, 35, 860, 34, 855,
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33, 851, 32, 846, 32, 841, 31, 836, 30, 831, 29, 826, 29, 821, 28, 816,
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27, 811, 27, 806, 26, 802, 25, 797, 24, 792, 24, 787, 23, 782, 23, 777,
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22, 772, 21, 767, 21, 762, 20, 757, 20, 752, 19, 747, 19, 742, 18, 737,
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17, 732, 17, 728, 16, 723, 16, 718, 15, 713, 15, 708, 15, 703, 14, 698,
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14, 693, 13, 688, 13, 683, 12, 678, 12, 674, 11, 669, 11, 664, 11, 659,
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10, 654, 10, 649, 10, 644, 9, 640, 9, 635, 9, 630, 8, 625, 8, 620,
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8, 615, 7, 611, 7, 606, 7, 601, 6, 596, 6, 592, 6, 587, 6, 582,
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5, 577, 5, 573, 5, 568, 5, 563, 4, 559, 4, 554, 4, 550, 4, 545,
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4, 540, 3, 536, 3, 531, 3, 527, 3, 522, 3, 517, 2, 513, 2, 508,
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2, 504, 2, 499, 2, 495, 2, 491, 2, 486, 1, 482, 1, 477, 1, 473,
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1, 469, 1, 464, 1, 460, 1, 456, 1, 451, 1, 447, 1, 443, 1, 439,
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0, 434, 0, 430, 0, 426, 0, 422, 0, 418, 0, 414, 0, 410, 0, 405,
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0, 401, 0, 397, 0, 393, 0, 389, 0, 385, 0, 381, 0, 378, 0, 374,
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};
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//// Counters
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#define RATE( rate, div )\
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(rate >= div ? rate / div * 8 - 1 : rate - 1)
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static unsigned const counter_mask [32] =
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{
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RATE( 2,2), RATE(2048,4), RATE(1536,3),
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RATE(1280,5), RATE(1024,4), RATE( 768,3),
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RATE( 640,5), RATE( 512,4), RATE( 384,3),
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RATE( 320,5), RATE( 256,4), RATE( 192,3),
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RATE( 160,5), RATE( 128,4), RATE( 96,3),
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RATE( 80,5), RATE( 64,4), RATE( 48,3),
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RATE( 40,5), RATE( 32,4), RATE( 24,3),
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RATE( 20,5), RATE( 16,4), RATE( 12,3),
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RATE( 10,5), RATE( 8,4), RATE( 6,3),
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RATE( 5,5), RATE( 4,4), RATE( 3,3),
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RATE( 2,4),
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RATE( 1,4)
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};
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#undef RATE
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inline void Spc_Dsp::init_counter()
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{
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// counters start out with this synchronization
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m.counters [0] = 1;
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m.counters [1] = 0;
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m.counters [2] = -0x20u;
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m.counters [3] = 0x0B;
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int n = 2;
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for ( int i = 1; i < 32; i++ )
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{
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m.counter_select [i] = &m.counters [n];
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if ( !--n )
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n = 3;
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}
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m.counter_select [ 0] = &m.counters [0];
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m.counter_select [30] = &m.counters [2];
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}
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inline void Spc_Dsp::run_counter( int i )
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{
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int n = m.counters [i];
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if ( !(n-- & 7) )
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n -= 6 - i;
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m.counters [i] = n;
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}
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#define READ_COUNTER( rate )\
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(*m.counter_select [rate] & counter_mask [rate])
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//// Emulation
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void Spc_Dsp::run( int clock_count )
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{
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int new_phase = m.phase + clock_count;
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int count = new_phase >> 5;
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m.phase = new_phase & 31;
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if ( !count )
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return;
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uint8_t* const ram = m.ram;
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uint8_t const* const dir = &ram [REG(dir) * 0x100];
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int const slow_gaussian = (REG(pmon) >> 1) | REG(non);
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int const noise_rate = REG(flg) & 0x1F;
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// Global volume
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int mvoll = (int8_t) REG(mvoll);
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int mvolr = (int8_t) REG(mvolr);
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if ( mvoll * mvolr < m.surround_threshold )
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mvoll = -mvoll; // eliminate surround
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do
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{
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// KON/KOFF reading
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if ( (m.every_other_sample ^= 1) != 0 )
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{
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m.new_kon &= ~m.kon;
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m.kon = m.new_kon;
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m.t_koff = REG(koff);
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}
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run_counter( 1 );
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run_counter( 2 );
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run_counter( 3 );
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// Noise
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if ( !READ_COUNTER( noise_rate ) )
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{
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int feedback = (m.noise << 13) ^ (m.noise << 14);
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m.noise = (feedback & 0x4000) ^ (m.noise >> 1);
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}
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// Voices
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int pmon_input = 0;
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int main_out_l = 0;
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int main_out_r = 0;
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int echo_out_l = 0;
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int echo_out_r = 0;
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voice_t* v = m.voices;
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uint8_t* v_regs = m.regs;
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int vbit = 1;
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do
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{
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#define SAMPLE_PTR(i) GET_LE16A( &dir [VREG(v_regs,srcn) * 4 + i * 2] )
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int brr_header = ram [v->brr_addr];
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int kon_delay = v->kon_delay;
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// Pitch
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int pitch = GET_LE16A( &VREG(v_regs,pitchl) ) & 0x3FFF;
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if ( REG(pmon) & vbit )
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pitch += ((pmon_input >> 5) * pitch) >> 10;
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// KON phases
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if ( --kon_delay >= 0 )
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{
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v->kon_delay = kon_delay;
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// Get ready to start BRR decoding on next sample
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if ( kon_delay == 4 )
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{
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v->brr_addr = SAMPLE_PTR( 0 );
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v->brr_offset = 1;
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v->buf_pos = v->buf;
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brr_header = 0; // header is ignored on this sample
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}
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// Envelope is never run during KON
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v->env = 0;
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v->hidden_env = 0;
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// Disable BRR decoding until last three samples
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v->interp_pos = (kon_delay & 3 ? 0x4000 : 0);
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// Pitch is never added during KON
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pitch = 0;
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}
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int env = v->env;
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// Gaussian interpolation
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{
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int output = 0;
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VREG(v_regs,envx) = (uint8_t) (env >> 4);
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if ( env )
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{
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// Make pointers into gaussian based on fractional position between samples
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int offset = (unsigned) v->interp_pos >> 3 & 0x1FE;
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short const* fwd = interleved_gauss + offset;
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short const* rev = interleved_gauss + 510 - offset; // mirror left half of gaussian
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int const* in = &v->buf_pos [(unsigned) v->interp_pos >> 12];
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if ( !(slow_gaussian & vbit) ) // 99%
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{
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// Faster approximation when exact sample value isn't necessary for pitch mod
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output = (fwd [0] * in [0] +
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fwd [1] * in [1] +
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rev [1] * in [2] +
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rev [0] * in [3]) >> 11;
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output = (output * env) >> 11;
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}
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else
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{
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output = (int16_t) (m.noise * 2);
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if ( !(REG(non) & vbit) )
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{
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output = (fwd [0] * in [0]) >> 11;
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output += (fwd [1] * in [1]) >> 11;
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output += (rev [1] * in [2]) >> 11;
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output = (int16_t) output;
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output += (rev [0] * in [3]) >> 11;
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CLAMP16( output );
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output &= ~1;
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}
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output = (output * env) >> 11 & ~1;
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}
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// Output
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int l = output * v->volume [0];
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int r = output * v->volume [1];
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main_out_l += l;
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main_out_r += r;
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if ( REG(eon) & vbit )
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{
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echo_out_l += l;
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echo_out_r += r;
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}
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}
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pmon_input = output;
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VREG(v_regs,outx) = (uint8_t) (output >> 8);
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}
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// Soft reset or end of sample
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if ( REG(flg) & 0x80 || (brr_header & 3) == 1 )
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{
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v->env_mode = env_release;
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env = 0;
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}
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if ( m.every_other_sample )
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{
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// KOFF
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if ( m.t_koff & vbit )
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v->env_mode = env_release;
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// KON
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if ( m.kon & vbit )
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{
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v->kon_delay = 5;
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v->env_mode = env_attack;
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REG(endx) &= ~vbit;
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}
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}
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// Envelope
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if ( !v->kon_delay )
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{
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if ( v->env_mode == env_release ) // 97%
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{
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env -= 0x8;
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v->env = env;
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if ( env <= 0 )
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{
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v->env = 0;
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goto skip_brr; // no BRR decoding for you!
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}
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}
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else // 3%
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{
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int rate;
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int const adsr0 = VREG(v_regs,adsr0);
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int env_data = VREG(v_regs,adsr1);
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if ( adsr0 >= 0x80 ) // 97% ADSR
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{
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if ( v->env_mode > env_decay ) // 89%
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{
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env--;
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env -= env >> 8;
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rate = env_data & 0x1F;
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// optimized handling
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v->hidden_env = env;
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if ( READ_COUNTER( rate ) )
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goto exit_env;
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v->env = env;
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goto exit_env;
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}
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else if ( v->env_mode == env_decay )
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{
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env--;
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env -= env >> 8;
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rate = (adsr0 >> 3 & 0x0E) + 0x10;
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}
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else // env_attack
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{
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rate = (adsr0 & 0x0F) * 2 + 1;
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env += rate < 31 ? 0x20 : 0x400;
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}
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}
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else // GAIN
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{
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int mode;
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env_data = VREG(v_regs,gain);
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mode = env_data >> 5;
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if ( mode < 4 ) // direct
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{
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env = env_data * 0x10;
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rate = 31;
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}
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else
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{
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rate = env_data & 0x1F;
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if ( mode == 4 ) // 4: linear decrease
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{
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env -= 0x20;
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}
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else if ( mode < 6 ) // 5: exponential decrease
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{
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env--;
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env -= env >> 8;
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}
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else // 6,7: linear increase
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{
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env += 0x20;
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if ( mode > 6 && (unsigned) v->hidden_env >= 0x600 )
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env += 0x8 - 0x20; // 7: two-slope linear increase
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}
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}
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}
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// Sustain level
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if ( (env >> 8) == (env_data >> 5) && v->env_mode == env_decay )
|
|
v->env_mode = env_sustain;
|
|
|
|
v->hidden_env = env;
|
|
|
|
// unsigned cast because linear decrease going negative also triggers this
|
|
if ( (unsigned) env > 0x7FF )
|
|
{
|
|
env = (env < 0 ? 0 : 0x7FF);
|
|
if ( v->env_mode == env_attack )
|
|
v->env_mode = env_decay;
|
|
}
|
|
|
|
if ( !READ_COUNTER( rate ) )
|
|
v->env = env; // nothing else is controlled by the counter
|
|
}
|
|
}
|
|
exit_env:
|
|
|
|
{
|
|
// Apply pitch
|
|
int old_pos = v->interp_pos;
|
|
int interp_pos = (old_pos & 0x3FFF) + pitch;
|
|
if ( interp_pos > 0x7FFF )
|
|
interp_pos = 0x7FFF;
|
|
v->interp_pos = interp_pos;
|
|
|
|
// BRR decode if necessary
|
|
if ( old_pos >= 0x4000 )
|
|
{
|
|
// Arrange the four input nybbles in 0xABCD order for easy decoding
|
|
int nybbles = ram [(v->brr_addr + v->brr_offset) & 0xFFFF] * 0x100 +
|
|
ram [(v->brr_addr + v->brr_offset + 1) & 0xFFFF];
|
|
|
|
// Advance read position
|
|
int const brr_block_size = 9;
|
|
int brr_offset = v->brr_offset;
|
|
if ( (brr_offset += 2) >= brr_block_size )
|
|
{
|
|
// Next BRR block
|
|
int brr_addr = (v->brr_addr + brr_block_size) & 0xFFFF;
|
|
assert( brr_offset == brr_block_size );
|
|
if ( brr_header & 1 )
|
|
{
|
|
brr_addr = SAMPLE_PTR( 1 );
|
|
if ( !v->kon_delay )
|
|
REG(endx) |= vbit;
|
|
}
|
|
v->brr_addr = brr_addr;
|
|
brr_offset = 1;
|
|
}
|
|
v->brr_offset = brr_offset;
|
|
|
|
// Decode
|
|
|
|
// 0: >>1 1: <<0 2: <<1 ... 12: <<11 13-15: >>4 <<11
|
|
static unsigned char const shifts [16 * 2] = {
|
|
13,12,12,12,12,12,12,12,12,12,12, 12, 12, 16, 16, 16,
|
|
0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 11, 11, 11
|
|
};
|
|
int const scale = brr_header >> 4;
|
|
int const right_shift = shifts [scale];
|
|
int const left_shift = shifts [scale + 16];
|
|
|
|
// Write to next four samples in circular buffer
|
|
int* pos = v->buf_pos;
|
|
int* end;
|
|
|
|
// Decode four samples
|
|
for ( end = pos + 4; pos < end; pos++, nybbles <<= 4 )
|
|
{
|
|
// Extract upper nybble and scale appropriately. Every cast is
|
|
// necessary to maintain correctness and avoid undef behavior
|
|
int s = int16_t(uint16_t((int16_t) nybbles >> right_shift) << left_shift);
|
|
|
|
// Apply IIR filter (8 is the most commonly used)
|
|
int const filter = brr_header & 0x0C;
|
|
int const p1 = pos [brr_buf_size - 1];
|
|
int const p2 = pos [brr_buf_size - 2] >> 1;
|
|
if ( filter >= 8 )
|
|
{
|
|
s += p1;
|
|
s -= p2;
|
|
if ( filter == 8 ) // s += p1 * 0.953125 - p2 * 0.46875
|
|
{
|
|
s += p2 >> 4;
|
|
s += (p1 * -3) >> 6;
|
|
}
|
|
else // s += p1 * 0.8984375 - p2 * 0.40625
|
|
{
|
|
s += (p1 * -13) >> 7;
|
|
s += (p2 * 3) >> 4;
|
|
}
|
|
}
|
|
else if ( filter ) // s += p1 * 0.46875
|
|
{
|
|
s += p1 >> 1;
|
|
s += (-p1) >> 5;
|
|
}
|
|
|
|
// Adjust and write sample
|
|
CLAMP16( s );
|
|
s = (int16_t) (s * 2);
|
|
pos [brr_buf_size] = pos [0] = s; // second copy simplifies wrap-around
|
|
}
|
|
|
|
if ( pos >= &v->buf [brr_buf_size] )
|
|
pos = v->buf;
|
|
v->buf_pos = pos;
|
|
}
|
|
}
|
|
skip_brr:
|
|
// Next voice
|
|
vbit <<= 1;
|
|
v_regs += 0x10;
|
|
v++;
|
|
}
|
|
while ( vbit < 0x100 );
|
|
|
|
// Echo position
|
|
int echo_offset = m.echo_offset;
|
|
uint8_t* const echo_ptr = &ram [(REG(esa) * 0x100 + echo_offset) & 0xFFFF];
|
|
if ( !echo_offset )
|
|
m.echo_length = (REG(edl) & 0x0F) * 0x800;
|
|
echo_offset += 4;
|
|
if ( echo_offset >= m.echo_length )
|
|
echo_offset = 0;
|
|
m.echo_offset = echo_offset;
|
|
|
|
// FIR
|
|
int echo_in_l = GET_LE16SA( echo_ptr + 0 );
|
|
int echo_in_r = GET_LE16SA( echo_ptr + 2 );
|
|
|
|
int (*echo_hist_pos) [2] = m.echo_hist_pos;
|
|
if ( ++echo_hist_pos >= &m.echo_hist [echo_hist_size] )
|
|
echo_hist_pos = m.echo_hist;
|
|
m.echo_hist_pos = echo_hist_pos;
|
|
|
|
echo_hist_pos [0] [0] = echo_hist_pos [8] [0] = echo_in_l;
|
|
echo_hist_pos [0] [1] = echo_hist_pos [8] [1] = echo_in_r;
|
|
|
|
#define CALC_FIR_( i, in ) ((in) * (int8_t) REG(fir + i * 0x10))
|
|
echo_in_l = CALC_FIR_( 7, echo_in_l );
|
|
echo_in_r = CALC_FIR_( 7, echo_in_r );
|
|
|
|
#define CALC_FIR( i, ch ) CALC_FIR_( i, echo_hist_pos [i + 1] [ch] )
|
|
#define DO_FIR( i )\
|
|
echo_in_l += CALC_FIR( i, 0 );\
|
|
echo_in_r += CALC_FIR( i, 1 );
|
|
DO_FIR( 0 );
|
|
DO_FIR( 1 );
|
|
DO_FIR( 2 );
|
|
#if defined (__MWERKS__) && __MWERKS__ < 0x3200
|
|
__eieio(); // keeps compiler from stupidly "caching" things in memory
|
|
#endif
|
|
DO_FIR( 3 );
|
|
DO_FIR( 4 );
|
|
DO_FIR( 5 );
|
|
DO_FIR( 6 );
|
|
|
|
// Echo out
|
|
if ( !(REG(flg) & 0x20) )
|
|
{
|
|
int l = (echo_out_l >> 7) + ((echo_in_l * (int8_t) REG(efb)) >> 14);
|
|
int r = (echo_out_r >> 7) + ((echo_in_r * (int8_t) REG(efb)) >> 14);
|
|
|
|
// just to help pass more validation tests
|
|
#if SPC_MORE_ACCURACY
|
|
l &= ~1;
|
|
r &= ~1;
|
|
#endif
|
|
|
|
CLAMP16( l );
|
|
CLAMP16( r );
|
|
|
|
SET_LE16A( echo_ptr + 0, l );
|
|
SET_LE16A( echo_ptr + 2, r );
|
|
}
|
|
|
|
// Sound out
|
|
int l = (main_out_l * mvoll + echo_in_l * (int8_t) REG(evoll)) >> 14;
|
|
int r = (main_out_r * mvolr + echo_in_r * (int8_t) REG(evolr)) >> 14;
|
|
|
|
CLAMP16( l );
|
|
CLAMP16( r );
|
|
|
|
if ( (REG(flg) & 0x40) )
|
|
{
|
|
l = 0;
|
|
r = 0;
|
|
}
|
|
|
|
sample_t* out = m.out;
|
|
WRITE_SAMPLES( l, r, out );
|
|
m.out = out;
|
|
}
|
|
while ( --count );
|
|
}
|
|
|
|
|
|
//// Setup
|
|
|
|
void Spc_Dsp::mute_voices( int mask )
|
|
{
|
|
m.mute_mask = mask;
|
|
for ( int i = 0; i < voice_count; i++ )
|
|
{
|
|
m.voices [i].enabled = (mask >> i & 1) - 1;
|
|
update_voice_vol( i * 0x10 );
|
|
}
|
|
}
|
|
|
|
void Spc_Dsp::init( void* ram_64k )
|
|
{
|
|
m.ram = (uint8_t*) ram_64k;
|
|
mute_voices( 0 );
|
|
disable_surround( false );
|
|
set_output( 0, 0 );
|
|
reset();
|
|
|
|
#ifndef NDEBUG
|
|
// be sure this sign-extends
|
|
assert( (int16_t) 0x8000 == -0x8000 );
|
|
|
|
// be sure right shift preserves sign
|
|
assert( (-1 >> 1) == -1 );
|
|
|
|
// check clamp macro
|
|
int i;
|
|
i = +0x8000; CLAMP16( i ); assert( i == +0x7FFF );
|
|
i = -0x8001; CLAMP16( i ); assert( i == -0x8000 );
|
|
|
|
blargg_verify_byte_order();
|
|
#endif
|
|
}
|
|
|
|
void Spc_Dsp::soft_reset_common()
|
|
{
|
|
require( m.ram ); // init() must have been called already
|
|
|
|
m.noise = 0x4000;
|
|
m.echo_hist_pos = m.echo_hist;
|
|
m.every_other_sample = 1;
|
|
m.echo_offset = 0;
|
|
m.phase = 0;
|
|
|
|
init_counter();
|
|
}
|
|
|
|
void Spc_Dsp::soft_reset()
|
|
{
|
|
REG(flg) = 0xE0;
|
|
soft_reset_common();
|
|
}
|
|
|
|
void Spc_Dsp::load( uint8_t const regs [register_count] )
|
|
{
|
|
memcpy( m.regs, regs, sizeof m.regs );
|
|
memset( &m.regs [register_count], 0, offsetof (state_t,ram) - register_count );
|
|
|
|
// Internal state
|
|
int i;
|
|
for ( i = voice_count; --i >= 0; )
|
|
{
|
|
voice_t& v = m.voices [i];
|
|
v.brr_offset = 1;
|
|
v.buf_pos = v.buf;
|
|
}
|
|
m.new_kon = REG(kon);
|
|
|
|
mute_voices( m.mute_mask );
|
|
soft_reset_common();
|
|
}
|
|
|
|
void Spc_Dsp::reset() { load( initial_regs ); }
|