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d725cae79e
There are two buffers when generating audio. The output buffer that readBuffer() fills, and the sample buffer where new samples are generated. The sample buffer is the larger of the two. When readBuffer() is called, samples are copied from the sample buffer to the output buffer. Usually it will copy some samples to the output buffer, generate new ones to the sample buffer, and copy the remaining ones needed to the output buffer. At the end, the remaining samples in the sample buffer are moved to the beginning of the buffer. It works out so that samples are always copied from the beginning of the sample buffer to somewhere in the output buffer. But here's where things went wrong: If the sample buffer was not full, but still contained enough samples to fill the output buffer, it would still copy the last samples in the sample buffer. It should copy the samples from right after the ones that had already been copied to the output buffer. I spent far too long beating my head against this bug, and I don't know how well I've explained it here. But the audio corruption appears to be gone now... Foo
760 lines
22 KiB
C++
760 lines
22 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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/*
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* The PSG_HuC6280 class is based on the HuC6280 sound chip emulator
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* by Charles MacDonald (E-mail: cgfm2@hotmail.com, WWW: http://cgfm2.emuviews.com)
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* The implementation used here was taken from MESS (http://www.mess.org/)
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* the Multiple Emulator Super System (sound/c6280.c).
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* LFO and noise channel support have been removed (not used by Loom PCE).
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*/
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#include "scumm/players/player_pce.h"
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#include "common/endian.h"
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// PCE sound engine is only used by Loom, which requires 16bit color support
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#ifdef USE_RGB_COLOR
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namespace Scumm {
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// CPU and PSG use the same base clock but with a different divider
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const double MASTER_CLOCK = 21477270.0; // ~21.48 MHz
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const double CPU_CLOCK = MASTER_CLOCK / 3; // ~7.16 MHz
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const double PSG_CLOCK = MASTER_CLOCK / 6; // ~3.58 MHz
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const double TIMER_CLOCK = CPU_CLOCK / 1024; // ~6.9 kHz
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// The PSG update routine is originally triggered by the timer IRQ (not by VSYNC)
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// approx. 120 times per second (TIML=0x39). But as just every second call is used
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// to update the PSG we will call the update routine approx. 60 times per second.
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const double UPDATE_FREQ = TIMER_CLOCK / (57 + 1) / 2; // ~60 Hz
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// $AFA5
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static const byte wave_table[7][32] = {
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{ // sine
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0x10, 0x19, 0x1C, 0x1D, 0x1E, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1E, 0x1D, 0x1C, 0x19,
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0x10, 0x05, 0x02, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x05,
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}, { // mw-shaped
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0x10, 0x1C, 0x1D, 0x1E, 0x1E, 0x1F, 0x1F, 0x1E, 0x1C, 0x1E, 0x1F, 0x1F, 0x1E, 0x1E, 0x1D, 0x1C,
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0x10, 0x03, 0x02, 0x01, 0x01, 0x00, 0x00, 0x01, 0x03, 0x01, 0x00, 0x00, 0x01, 0x01, 0x02, 0x03,
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}, { // square
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0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E, 0x1E,
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0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
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}, { // triangle
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0x10, 0x0C, 0x08, 0x04, 0x01, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C, 0x1F, 0x1C, 0x18, 0x14,
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0x10, 0x0C, 0x08, 0x04, 0x01, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C, 0x1F, 0x1C, 0x18, 0x14,
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}, { // saw-tooth
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0x00, 0x01, 0x02, 0x03, 0x04, 0x06, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
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}, { // sigmoid
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0x07, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x1F, 0x1F, 0x1E, 0x1D, 0x1C, 0x1B, 0x1A, 0x19,
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0x08, 0x06, 0x05, 0x03, 0x02, 0x01, 0x00, 0x00, 0x0F, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x16,
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}, { // MW-shaped
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0x1F, 0x1E, 0x1D, 0x1D, 0x1C, 0x1A, 0x17, 0x0F, 0x0F, 0x17, 0x1A, 0x1C, 0x1D, 0x1D, 0x1E, 0x1F,
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0x00, 0x01, 0x02, 0x02, 0x03, 0x05, 0x08, 0x0F, 0x0F, 0x08, 0x05, 0x03, 0x02, 0x02, 0x01, 0x00
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}
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};
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// AEBC
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static const int control_offsets[14] = {
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0, 7, 20, 33, 46, 56, 75, 88, 116, 126, 136, 152, 165, 181
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};
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// AED8
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static const byte control_data[205] = {
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/* 0*/ 0xF0, 0x00, 0xF8, 0x01, 0x00, 0x00, 0xFF,
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/* 7*/ 0xF0, 0x00, 0xF8, 0x01, 0x00, 0x00, 0x01, 0x00, 0xF0, 0x3A, 0x00, 0xFD, 0xFF,
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/* 20*/ 0xF0, 0x00, 0xF8, 0x01, 0x00, 0x00, 0x01, 0x00, 0xF0, 0x1D, 0x00, 0xF8, 0xFF,
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/* 33*/ 0xF0, 0x00, 0xF8, 0x01, 0x00, 0x00, 0x02, 0x00, 0xF0, 0x1E, 0x00, 0xFC, 0xFF,
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/* 46*/ 0xF0, 0x00, 0xF8, 0x01, 0x00, 0x00, 0x07, 0x00, 0xE0, 0xFF,
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/* 56*/ 0xF0, 0x00, 0xF8, 0x01, 0x00, 0x00, 0x01, 0x00, 0xD8, 0xF0, 0x00, 0xD8, 0x01, 0x00, 0x00, 0x04, 0x00, 0xF0, 0xFF,
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/* 75*/ 0xF0, 0x00, 0xF8, 0x01, 0x00, 0x00, 0x03, 0x00, 0xF8, 0x6E, 0x00, 0xFF, 0xFF,
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/* 88*/ 0xF0, 0x00, 0xF8, 0x01, 0x00, 0x00, 0x08, 0x00, 0xF0, 0xF0, 0x00, 0xD0, 0x01, 0x00, 0x00, 0x05, 0x00, 0xF0, 0xF0, 0x00, 0xB8, 0xE6, 0x80, 0xFF, 0xE6, 0x80, 0xFF, 0xFF,
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/*116*/ 0xF0, 0x00, 0xF8, 0x01, 0x00, 0x00, 0x05, 0x00, 0xD0, 0xFF,
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/*126*/ 0xF0, 0x00, 0xF8, 0x01, 0x00, 0x00, 0x04, 0x00, 0xF8, 0xFF,
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/*136*/ 0xF0, 0x00, 0xF8, 0x01, 0x00, 0x00, 0x03, 0x00, 0xF4, 0xE6, 0xC0, 0xFF, 0xE6, 0xC0, 0xFF, 0xFF,
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/*152*/ 0xF0, 0x00, 0xD0, 0x01, 0x00, 0x00, 0x02, 0x00, 0x10, 0x0E, 0x00, 0xFE, 0xFF,
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/*165*/ 0xF0, 0x00, 0xA8, 0x01, 0x00, 0x00, 0x18, 0x00, 0x02, 0xE6, 0x80, 0xFE, 0xE6, 0xC0, 0xFF, 0xFF,
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/*181*/ 0xF0, 0x00, 0xF8, 0x01, 0x00, 0x00, 0x02, 0x00, 0xF8, 0x02, 0x00, 0x00, 0x02, 0x00, 0xF0, 0x01, 0x00, 0xF8, 0x02, 0x00, 0x08, 0xF1, 0x99, 0xAF
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};
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static const uint16 lookup_table[87] = {
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0x0D40, 0x0C80, 0x0BC0, 0x0B20, 0x0A80, 0x09E0, 0x0940, 0x08C0,
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0x0840, 0x07E0, 0x0760, 0x0700, 0x06A0, 0x0640, 0x05E0, 0x0590,
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0x0540, 0x04F0, 0x04A0, 0x0460, 0x0420, 0x03F0, 0x03B0, 0x0380,
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0x0350, 0x0320, 0x02F0, 0x02C8, 0x02A0, 0x0278, 0x0250, 0x0230,
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0x0210, 0x01F8, 0x01D8, 0x01C0, 0x01A8, 0x0190, 0x0178, 0x0164,
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0x0150, 0x013C, 0x0128, 0x0118, 0x0108, 0x00FC, 0x00EC, 0x00E0,
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0x00D4, 0x00C8, 0x00BC, 0x00B2, 0x00A8, 0x009E, 0x0094, 0x008C,
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0x0084, 0x007E, 0x0076, 0x0070, 0x006A, 0x0064, 0x005E, 0x0059,
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0x0054, 0x004F, 0x004A, 0x0046, 0x0042, 0x003F, 0x003B, 0x0038,
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0x0035, 0x0032, 0x0030, 0x002D, 0x002A, 0x0028, 0x0026, 0x0024,
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0x0022, 0x0020, 0x001E, 0x001C, 0x001B, 0x8E82, 0xB500
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};
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// B27B
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static const uint16 freq_offset[3] = {
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0, 2, 9
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};
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static const uint16 freq_table[] = {
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0x0000, 0x0800,
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0xFFB0, 0xFFD1, 0xFFE8, 0xFFF1, 0x0005, 0x0000, 0x0800,
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0xFF9C, 0xFFD8, 0x0000, 0x000F, 0x0005, 0x0000, 0x0800
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};
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static const int sound_table[13] = {
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0, 2, 3, 4, 5, 6, 7, 8, 9, 11, 1, 10, 11
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};
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// 0xAE12
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// Note:
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// - offsets relative to data_table
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// - byte one of each sound was always 0x3F (= use all channels) -> removed from table
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static const uint16 sounds[13][6] = {
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{ 481, 481, 481, 481, 481, 481 },
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{ 395, 408, 467, 480, 480, 480 },
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{ 85, 96, 109, 109, 109, 109 },
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{ 110, 121, 134, 134, 134, 134 },
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{ 135, 146, 159, 159, 159, 159 },
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{ 160, 171, 184, 184, 184, 184 },
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{ 185, 196, 209, 209, 209, 209 },
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{ 210, 221, 234, 234, 234, 234 },
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{ 235, 246, 259, 259, 259, 259 },
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{ 260, 271, 284, 284, 284, 284 },
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{ 285, 298, 311, 324, 335, 348 },
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{ 349, 360, 361, 362, 373, 384 },
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{ 0, 84, 84, 84, 84, 84 } // unused
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};
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// 0xB2A1
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static const byte data_table[482] = {
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/* 0*/ 0xE2, 0x0A, 0xE1, 0x0D, 0xE6, 0xED, 0xE0, 0x0F, 0xE2, 0x00, 0xE1, 0x00,
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0xF2, 0xF2, 0xB2, 0xE1, 0x01, 0xF2, 0xF2, 0xB2, 0xE1, 0x02, 0xF2, 0xF2,
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0xB2, 0xE1, 0x03, 0xF2, 0xF2, 0xB2, 0xE1, 0x04, 0xF2, 0xF2, 0xB2, 0xE1,
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0x05, 0xF2, 0xF2, 0xB2, 0xE1, 0x06, 0xF2, 0xF2, 0xB2, 0xE1, 0x07, 0xF2,
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0xF2, 0xB2, 0xE1, 0x08, 0xF2, 0xF2, 0xB2, 0xE1, 0x09, 0xF2, 0xF2, 0xB2,
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0xE1, 0x0A, 0xF2, 0xF2, 0xB2, 0xE1, 0x0B, 0xF2, 0xF2, 0xB2, 0xE1, 0x0C,
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0xF2, 0xF2, 0xB2, 0xE1, 0x0D, 0xF2, 0xF2, 0xB2, 0xFF, 0xD1, 0x03, 0xF3,
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/* 84*/ 0xFF,
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/* 85*/ 0xE2, 0x0C, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD3, 0x07, 0xFF,
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/* 96*/ 0xE2, 0x06, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD4, 0xF0, 0x0C, 0x07, 0xFF,
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/*109*/ 0xFF,
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/*110*/ 0xE2, 0x0C, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD3, 0x27, 0xFF,
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/*121*/ 0xE2, 0x06, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD4, 0xF0, 0x0C, 0x27, 0xFF,
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/*134*/ 0xFF,
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/*135*/ 0xE2, 0x0C, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD3, 0x47, 0xFF,
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/*146*/ 0xE2, 0x06, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD4, 0xF0, 0x0C, 0x47, 0xFF,
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/*159*/ 0xFF,
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/*160*/ 0xE2, 0x0C, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD3, 0x57, 0xFF,
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/*171*/ 0xE2, 0x06, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD4, 0xF0, 0x0C, 0x57, 0xFF,
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/*184*/ 0xFF,
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/*185*/ 0xE2, 0x0C, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD3, 0x77, 0xFF,
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/*196*/ 0xE2, 0x06, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD4, 0xF0, 0x0C, 0x77, 0xFF,
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/*209*/ 0xFF,
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/*210*/ 0xE2, 0x0C, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD3, 0x97, 0xFF,
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/*221*/ 0xE2, 0x06, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD4, 0xF0, 0x0C, 0x97, 0xFF,
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/*234*/ 0xFF,
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/*235*/ 0xE2, 0x0C, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD3, 0xB7, 0xFF,
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/*246*/ 0xE2, 0x06, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD4, 0xF0, 0x0C, 0xB7, 0xFF,
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/*259*/ 0xFF,
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/*260*/ 0xE2, 0x0C, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD4, 0x07, 0xFF,
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/*271*/ 0xE2, 0x06, 0xE1, 0x02, 0xE0, 0x0F, 0xE6, 0xED, 0xD5, 0xF0, 0x0C, 0x07, 0xFF,
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/*284*/ 0xFF,
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/*285*/ 0xE2, 0x0B, 0xE1, 0x04, 0xE6, 0xED, 0xE0, 0x0A, 0xD0, 0xDB, 0x14, 0x0E, 0xFF,
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/*298*/ 0xE2, 0x0B, 0xE1, 0x04, 0xE6, 0xED, 0xE0, 0x0A, 0xD0, 0xDB, 0x32, 0x1E, 0xFF,
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/*311*/ 0xE2, 0x0B, 0xE1, 0x0B, 0xE6, 0xED, 0xE0, 0x0A, 0xD0, 0xDB, 0x50, 0x1E, 0xFF,
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/*324*/ 0xE2, 0x0B, 0xE1, 0x0B, 0xE6, 0xED, 0xE0, 0x0A, 0xD0, 0x0E, 0xFF,
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/*335*/ 0xE2, 0x0B, 0xE1, 0x02, 0xE6, 0xED, 0xE0, 0x0A, 0xD0, 0xDB, 0x0A, 0x0E, 0xFF,
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/*348*/ 0xFF,
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/*349*/ 0xE2, 0x03, 0xE1, 0x01, 0xE6, 0xED, 0xE0, 0x06, 0xD6, 0x17, 0xFF,
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/*360*/ 0xFF,
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/*361*/ 0xFF,
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/*362*/ 0xE2, 0x04, 0xE1, 0x04, 0xE6, 0xED, 0xE0, 0x06, 0xD5, 0xA7, 0xFF,
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/*373*/ 0xE2, 0x03, 0xE1, 0x06, 0xE6, 0xED, 0xE0, 0x06, 0xD6, 0x37, 0xFF,
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/*384*/ 0xE2, 0x04, 0xE1, 0x06, 0xE6, 0xED, 0xE0, 0x06, 0xD3, 0x87, 0xFF,
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/*395*/ 0xE2, 0x0C, 0xE1, 0x00, 0xE0, 0x04, 0xE6, 0xED, 0xD4, 0x0B, 0xE8, 0x0B, 0xFF,
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/*408*/ 0xE2, 0x0C, 0xE1, 0x03, 0xE0, 0x04, 0xE6, 0xED, 0xD4, 0xF0, 0x0C, 0x00,
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0xE8, 0x10, 0xE8, 0x00, 0xE8, 0x10, 0xE8, 0x00, 0xE8, 0x10, 0xE8, 0x00,
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0xE8, 0x10, 0xE8, 0x00, 0xE8, 0x10, 0xE8, 0x00, 0xE8, 0x10, 0xE8, 0x00,
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0xE8, 0x10, 0xE8, 0x00, 0xE8, 0x10, 0xE8, 0x00, 0xE8, 0x10, 0xE8, 0x00,
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0xE8, 0x10, 0xE8, 0x00, 0xE8, 0x10, 0xE8, 0x00, 0xE8, 0x10, 0xFF,
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/*467*/ 0xE2, 0x0C, 0xE1, 0x00, 0xE0, 0x04, 0xE6, 0xED, 0xD4, 0x1B, 0xE8, 0x1B, 0xFF,
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/*480*/ 0xFF,
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/*481*/ 0xFF
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};
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/*
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* PSG_HuC6280
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*/
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class PSG_HuC6280 {
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private:
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typedef struct {
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uint16 frequency;
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uint8 control;
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uint8 balance;
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uint8 waveform[32];
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uint8 index;
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int16 dda;
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uint32 counter;
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} channel_t;
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double _clock;
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double _rate;
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uint8 _select;
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uint8 _balance;
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channel_t _channel[8];
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int16 _volumeTable[32];
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uint32 _noiseFreqTable[32];
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uint32 _waveFreqTable[4096];
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public:
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void init();
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void reset();
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void write(int offset, byte data);
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void update(int16* samples, int sampleCnt);
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PSG_HuC6280(double clock, double samplerate);
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};
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PSG_HuC6280::PSG_HuC6280(double clock, double samplerate) {
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_clock = clock;
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_rate = samplerate;
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// Initialize PSG_HuC6280 emulator
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init();
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}
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void PSG_HuC6280::init() {
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int i;
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double step;
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// Loudest volume level for table
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double level = 65535.0 / 6.0 / 32.0;
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// Clear context
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reset();
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// Make waveform frequency table
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for (i = 0; i < 4096; i++) {
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step = ((_clock / _rate) * 4096) / (i+1);
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_waveFreqTable[(1 + i) & 0xFFF] = (uint32)step;
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}
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// Make noise frequency table
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for (i = 0; i < 32; i++) {
|
|
step = ((_clock / _rate) * 32) / (i+1);
|
|
_noiseFreqTable[i] = (uint32)step;
|
|
}
|
|
|
|
// Make volume table
|
|
// PSG_HuC6280 has 48dB volume range spread over 32 steps
|
|
step = 48.0 / 32.0;
|
|
for (i = 0; i < 31; i++) {
|
|
_volumeTable[i] = (uint16)level;
|
|
level /= pow(10.0, step / 20.0);
|
|
}
|
|
_volumeTable[31] = 0;
|
|
}
|
|
|
|
void PSG_HuC6280::reset() {
|
|
_select = 0;
|
|
_balance = 0xFF;
|
|
memset(_channel, 0, sizeof(_channel));
|
|
memset(_volumeTable, 0, sizeof(_volumeTable));
|
|
memset(_noiseFreqTable, 0, sizeof(_noiseFreqTable));
|
|
memset(_waveFreqTable, 0, sizeof(_waveFreqTable));
|
|
}
|
|
|
|
void PSG_HuC6280::write(int offset, byte data) {
|
|
channel_t *chan = &_channel[_select];
|
|
|
|
switch(offset & 0x0F) {
|
|
case 0x00: // Channel select
|
|
_select = data & 0x07;
|
|
break;
|
|
|
|
case 0x01: // Global balance
|
|
_balance = data;
|
|
break;
|
|
|
|
case 0x02: // Channel frequency (LSB)
|
|
chan->frequency = (chan->frequency & 0x0F00) | data;
|
|
chan->frequency &= 0x0FFF;
|
|
break;
|
|
|
|
case 0x03: // Channel frequency (MSB)
|
|
chan->frequency = (chan->frequency & 0x00FF) | (data << 8);
|
|
chan->frequency &= 0x0FFF;
|
|
break;
|
|
|
|
case 0x04: // Channel control (key-on, DDA mode, volume)
|
|
// 1-to-0 transition of DDA bit resets waveform index
|
|
if ((chan->control & 0x40) && ((data & 0x40) == 0)) {
|
|
chan->index = 0;
|
|
}
|
|
chan->control = data;
|
|
break;
|
|
|
|
case 0x05: // Channel balance
|
|
chan->balance = data;
|
|
break;
|
|
|
|
case 0x06: // Channel waveform data
|
|
switch(chan->control & 0xC0) {
|
|
case 0x00:
|
|
chan->waveform[chan->index & 0x1F] = data & 0x1F;
|
|
chan->index = (chan->index + 1) & 0x1F;
|
|
break;
|
|
|
|
case 0x40:
|
|
default:
|
|
break;
|
|
|
|
case 0x80:
|
|
chan->waveform[chan->index & 0x1F] = data & 0x1F;
|
|
chan->index = (chan->index + 1) & 0x1F;
|
|
break;
|
|
|
|
case 0xC0:
|
|
chan->dda = data & 0x1F;
|
|
break;
|
|
}
|
|
|
|
break;
|
|
|
|
case 0x07: // Noise control (enable, frequency)
|
|
case 0x08: // LFO frequency
|
|
case 0x09: // LFO control (enable, mode)
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void PSG_HuC6280::update(int16* samples, int sampleCnt) {
|
|
static const int scale_tab[] = {
|
|
0x00, 0x03, 0x05, 0x07, 0x09, 0x0B, 0x0D, 0x0F,
|
|
0x10, 0x13, 0x15, 0x17, 0x19, 0x1B, 0x1D, 0x1F
|
|
};
|
|
int ch;
|
|
int i;
|
|
|
|
int lmal = (_balance >> 4) & 0x0F;
|
|
int rmal = (_balance >> 0) & 0x0F;
|
|
int vll, vlr;
|
|
|
|
lmal = scale_tab[lmal];
|
|
rmal = scale_tab[rmal];
|
|
|
|
// Clear buffer
|
|
memset(samples, 0, 2 * sampleCnt * sizeof(int16));
|
|
|
|
for (ch = 0; ch < 6; ch++) {
|
|
// Only look at enabled channels
|
|
if (_channel[ch].control & 0x80) {
|
|
int lal = (_channel[ch].balance >> 4) & 0x0F;
|
|
int ral = (_channel[ch].balance >> 0) & 0x0F;
|
|
int al = _channel[ch].control & 0x1F;
|
|
|
|
lal = scale_tab[lal];
|
|
ral = scale_tab[ral];
|
|
|
|
// Calculate volume just as the patent says
|
|
vll = (0x1F - lal) + (0x1F - al) + (0x1F - lmal);
|
|
if (vll > 0x1F) vll = 0x1F;
|
|
|
|
vlr = (0x1F - ral) + (0x1F - al) + (0x1F - rmal);
|
|
if (vlr > 0x1F) vlr = 0x1F;
|
|
|
|
vll = _volumeTable[vll];
|
|
vlr = _volumeTable[vlr];
|
|
|
|
// Check channel mode
|
|
if (_channel[ch].control & 0x40) {
|
|
/* DDA mode */
|
|
for (i = 0; i < sampleCnt; i++) {
|
|
samples[2*i] += (int16)(vll * (_channel[ch].dda - 16));
|
|
samples[2*i + 1] += (int16)(vlr * (_channel[ch].dda - 16));
|
|
}
|
|
} else {
|
|
/* Waveform mode */
|
|
uint32 step = _waveFreqTable[_channel[ch].frequency];
|
|
for (i = 0; i < sampleCnt; i += 1) {
|
|
int offset;
|
|
int16 data;
|
|
offset = (_channel[ch].counter >> 12) & 0x1F;
|
|
_channel[ch].counter += step;
|
|
_channel[ch].counter &= 0x1FFFF;
|
|
data = _channel[ch].waveform[offset];
|
|
samples[2*i] += (int16)(vll * (data - 16));
|
|
samples[2*i + 1] += (int16)(vlr * (data - 16));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Player_PCE
|
|
*/
|
|
|
|
void Player_PCE::PSG_Write(int reg, byte data) {
|
|
_psg->write(reg, data);
|
|
}
|
|
|
|
void Player_PCE::setupWaveform(byte bank) {
|
|
const byte *ptr = wave_table[bank];
|
|
PSG_Write(4, 0x40);
|
|
PSG_Write(4, 0x00);
|
|
for (int i = 0; i < 32; ++i) {
|
|
PSG_Write(6, ptr[i]);
|
|
}
|
|
}
|
|
|
|
// A541
|
|
void Player_PCE::procA541(channel_t *channel) {
|
|
channel->soundDataPtr = NULL;
|
|
channel->controlVecShort10 = 0;
|
|
|
|
channel->controlVecShort03 = 0;
|
|
channel->controlVecShort06 = 0;
|
|
channel->controlVec8 = 0;
|
|
channel->controlVec9 = 0;
|
|
channel->controlVec10 = 0;
|
|
channel->soundUpdateCounter = 0;
|
|
channel->controlVec18 = 0;
|
|
channel->controlVec19 = 0;
|
|
channel->controlVec23 = false;
|
|
channel->controlVec24 = false;
|
|
channel->controlVec21 = 0;
|
|
|
|
channel->waveformCtrl = 0x80;
|
|
}
|
|
|
|
// A592
|
|
void Player_PCE::startSound(int sound) {
|
|
channel_t *channel;
|
|
const uint16 *ptr = sounds[sound_table[sound]];
|
|
|
|
for (int i = 0; i < 6; ++i) {
|
|
channel = &channels[i];
|
|
procA541(channel);
|
|
|
|
channel->controlVec24 = true;
|
|
channel->waveformCtrl = 0;
|
|
channel->controlVec0 = 0;
|
|
channel->controlVec19 = 0;
|
|
channel->controlVec18 = 0;
|
|
channel->soundDataPtr = &data_table[*ptr++];
|
|
}
|
|
}
|
|
|
|
// A64B
|
|
void Player_PCE::updateSound() {
|
|
for (int i = 0; i < 12; i++) {
|
|
channel_t *channel = &channels[i];
|
|
bool cond = true;
|
|
if (i < 6) {
|
|
channel->controlVec21 ^= 0xFF;
|
|
if (!channel->controlVec21)
|
|
cond = false;
|
|
}
|
|
if (cond) {
|
|
processSoundData(channel);
|
|
procAB7F(channel);
|
|
procAC24(channel);
|
|
channel->controlVec11 = (channel->controlVecShort10 >> 11) | 0x80;
|
|
channel->balance = channel->balance2;
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < 6; ++i) {
|
|
procA731(&channels[i]);
|
|
}
|
|
}
|
|
|
|
int Player_PCE::readBuffer(int16 *buffer, const int numSamples) {
|
|
int sampleCopyCnt;
|
|
int samplesLeft = numSamples;
|
|
int16 *sampleBufferPtr = _sampleBuffer;
|
|
|
|
Common::StackLock lock(_mutex);
|
|
|
|
while (true) {
|
|
// copy samples to output buffer
|
|
sampleCopyCnt = (samplesLeft < _sampleBufferCnt) ? samplesLeft : _sampleBufferCnt;
|
|
if (sampleCopyCnt > 0) {
|
|
memcpy(buffer, sampleBufferPtr, sampleCopyCnt * sizeof(int16));
|
|
buffer += sampleCopyCnt;
|
|
samplesLeft -= sampleCopyCnt;
|
|
_sampleBufferCnt -= sampleCopyCnt;
|
|
sampleBufferPtr += sampleCopyCnt;
|
|
}
|
|
|
|
if (samplesLeft == 0)
|
|
break;
|
|
|
|
// retrieve samples for one timer period
|
|
updateSound();
|
|
_psg->update(_sampleBuffer, _samplesPerPeriod / 2);
|
|
_sampleBufferCnt = _samplesPerPeriod;
|
|
sampleBufferPtr = _sampleBuffer;
|
|
}
|
|
|
|
// copy remaining samples to the front of the buffer
|
|
if (_sampleBufferCnt > 0) {
|
|
memmove(_sampleBuffer,
|
|
sampleBufferPtr,
|
|
_sampleBufferCnt * sizeof(int16));
|
|
}
|
|
|
|
return numSamples;
|
|
}
|
|
|
|
void Player_PCE::procA731(channel_t *channel) {
|
|
PSG_Write(0, channel->id);
|
|
PSG_Write(2, channel->freq & 0xFF);
|
|
PSG_Write(3, (channel->freq >> 8) & 0xFF);
|
|
|
|
int tmp = channel->controlVec11;
|
|
if ((channel->controlVec11 & 0xC0) == 0x80) {
|
|
tmp = channel->controlVec11 & 0x1F;
|
|
if (tmp != 0) {
|
|
tmp -= channel->controlVec0;
|
|
if (tmp >= 0) {
|
|
tmp |= 0x80;
|
|
} else {
|
|
tmp = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
PSG_Write(5, channel->balance);
|
|
if ((channel->waveformCtrl & 0x80) == 0) {
|
|
channel->waveformCtrl |= 0x80;
|
|
PSG_Write(0, channel->id);
|
|
setupWaveform(channel->waveformCtrl & 0x7F);
|
|
}
|
|
|
|
PSG_Write(4, tmp);
|
|
}
|
|
|
|
// A793
|
|
void Player_PCE::processSoundData(channel_t *channel) {
|
|
channel->soundUpdateCounter--;
|
|
if (channel->soundUpdateCounter > 0) {
|
|
return;
|
|
}
|
|
|
|
while (true) {
|
|
const byte *ptr = channel->soundDataPtr;
|
|
byte value = (ptr ? *ptr++ : 0xFF);
|
|
if (value < 0xD0) {
|
|
int mult = (value & 0x0F) + 1;
|
|
channel->soundUpdateCounter = mult * channel->controlVec1;
|
|
value >>= 4;
|
|
procAA62(channel, value);
|
|
channel->soundDataPtr = ptr;
|
|
return;
|
|
}
|
|
|
|
// jump_table (A7F7)
|
|
switch (value - 0xD0) {
|
|
case 0: /*A85A*/
|
|
case 1: /*A85D*/
|
|
case 2: /*A861*/
|
|
case 3: /*A865*/
|
|
case 4: /*A869*/
|
|
case 5: /*A86D*/
|
|
case 6: /*A871*/
|
|
channel->controlVec2 = (value - 0xD0) * 12;
|
|
break;
|
|
case 11: /*A8A8*/
|
|
channel->controlVecShort06 = (int8)*ptr++;
|
|
break;
|
|
case 16: /*A8C2*/
|
|
channel->controlVec1 = *ptr++;
|
|
break;
|
|
case 17: /*A8CA*/
|
|
channel->waveformCtrl = *ptr++;
|
|
break;
|
|
case 18: /*A8D2*/
|
|
channel->controlVec10 = *ptr++;
|
|
break;
|
|
case 22: /*A8F2*/
|
|
value = *ptr;
|
|
channel->balance = value;
|
|
channel->balance2 = value;
|
|
ptr++;
|
|
break;
|
|
case 24: /*A905*/
|
|
channel->controlVec23 = true;
|
|
break;
|
|
case 32: /*A921*/
|
|
ptr++;
|
|
break;
|
|
case 47:
|
|
channel->controlVec24 = false;
|
|
channel->controlVec10 &= 0x7F;
|
|
channel->controlVecShort10 &= 0x00FF;
|
|
return;
|
|
default:
|
|
// unused -> ignore
|
|
break;
|
|
}
|
|
|
|
channel->soundDataPtr = ptr;
|
|
}
|
|
}
|
|
|
|
void Player_PCE::procAA62(channel_t *channel, int a) {
|
|
procACEA(channel, a);
|
|
if (channel->controlVec23) {
|
|
channel->controlVec23 = false;
|
|
return;
|
|
}
|
|
|
|
channel->controlVec18 = 0;
|
|
|
|
channel->controlVec10 |= 0x80;
|
|
int y = channel->controlVec10 & 0x7F;
|
|
channel->controlBufferPos = &control_data[control_offsets[y]];
|
|
channel->controlVec5 = 0;
|
|
}
|
|
|
|
void Player_PCE::procAB7F(channel_t *channel) {
|
|
uint16 freqValue = channel->controlVecShort02;
|
|
channel->controlVecShort02 += channel->controlVecShort03;
|
|
|
|
int pos = freq_offset[channel->controlVec19] + channel->controlVec18;
|
|
freqValue += freq_table[pos];
|
|
if (freq_table[pos + 1] != 0x0800) {
|
|
channel->controlVec18++;
|
|
}
|
|
freqValue += channel->controlVecShort06;
|
|
|
|
channel->freq = freqValue;
|
|
}
|
|
|
|
void Player_PCE::procAC24(channel_t *channel) {
|
|
if ((channel->controlVec10 & 0x80) == 0)
|
|
return;
|
|
|
|
if (channel->controlVec5 == 0) {
|
|
const byte *ctrlPtr = channel->controlBufferPos;
|
|
byte value = *ctrlPtr++;
|
|
while (value >= 0xF0) {
|
|
if (value == 0xF0) {
|
|
channel->controlVecShort10 = READ_LE_UINT16(ctrlPtr);
|
|
ctrlPtr += 2;
|
|
} else if (value == 0xFF) {
|
|
channel->controlVec10 &= 0x7F;
|
|
return;
|
|
} else {
|
|
// unused
|
|
}
|
|
value = *ctrlPtr++;
|
|
}
|
|
channel->controlVec5 = value;
|
|
channel->controlVecShort09 = READ_LE_UINT16(ctrlPtr);
|
|
ctrlPtr += 2;
|
|
channel->controlBufferPos = ctrlPtr;
|
|
}
|
|
|
|
channel->controlVecShort10 += channel->controlVecShort09;
|
|
channel->controlVec5--;
|
|
}
|
|
|
|
void Player_PCE::procACEA(channel_t *channel, int a) {
|
|
int x = a +
|
|
channel->controlVec2 +
|
|
channel->controlVec8 +
|
|
channel->controlVec9;
|
|
channel->controlVecShort02 = lookup_table[x];
|
|
}
|
|
|
|
Player_PCE::Player_PCE(ScummEngine *scumm, Audio::Mixer *mixer) {
|
|
for (int i = 0; i < 12; ++i) {
|
|
memset(&channels[i], 0, sizeof(channel_t));
|
|
channels[i].id = i;
|
|
}
|
|
|
|
_mixer = mixer;
|
|
_sampleRate = _mixer->getOutputRate();
|
|
_vm = scumm;
|
|
|
|
_samplesPerPeriod = 2 * (int)(_sampleRate / UPDATE_FREQ);
|
|
_sampleBuffer = new int16[_samplesPerPeriod];
|
|
_sampleBufferCnt = 0;
|
|
|
|
_psg = new PSG_HuC6280(PSG_CLOCK, _sampleRate);
|
|
|
|
_mixer->playStream(Audio::Mixer::kPlainSoundType, &_soundHandle, this, -1, Audio::Mixer::kMaxChannelVolume, 0, DisposeAfterUse::NO, true);
|
|
}
|
|
|
|
Player_PCE::~Player_PCE() {
|
|
_mixer->stopHandle(_soundHandle);
|
|
delete[] _sampleBuffer;
|
|
delete _psg;
|
|
}
|
|
|
|
void Player_PCE::stopSound(int nr) {
|
|
// TODO: implement
|
|
}
|
|
|
|
void Player_PCE::stopAllSounds() {
|
|
// TODO: implement
|
|
}
|
|
|
|
int Player_PCE::getSoundStatus(int nr) const {
|
|
// TODO: status for each sound
|
|
for (int i = 0; i < 6; ++i) {
|
|
if (channels[i].controlVec24)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int Player_PCE::getMusicTimer() {
|
|
return 0;
|
|
}
|
|
|
|
} // End of namespace Scumm
|
|
|
|
#endif // USE_RGB_COLOR
|