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This commit is contained in:
392
audio/softsynth/cms.cpp
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392
audio/softsynth/cms.cpp
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/* 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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "audio/softsynth/cms.h"
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#include "audio/null.h"
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#include "common/textconsole.h"
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#include "common/translation.h"
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#include "common/debug.h"
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// CMS/Gameblaster Emulation taken from DosBox
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#define LEFT 0x00
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#define RIGHT 0x01
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#define FRAC_ONE_CMS (1UL << 8)
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/*#define MASTER_CLOCK 14318180/2 */
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#define MASTER_CLOCK (7159090UL * FRAC_ONE_CMS)
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static const byte envelope[8][64] = {
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/* zero amplitude */
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
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/* maximum amplitude */
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{15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
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15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
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15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,
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15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15 },
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/* single decay */
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{15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
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/* repetitive decay */
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{15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
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15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
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15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
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15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 },
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/* single triangular */
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
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15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
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/* repetitive triangular */
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
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15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
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15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 },
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/* single attack */
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
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/* repetitive attack */
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15 }
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};
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static const int amplitude_lookup[16] = {
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0*32767/16, 1*32767/16, 2*32767/16, 3*32767/16,
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4*32767/16, 5*32767/16, 6*32767/16, 7*32767/16,
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8*32767/16, 9*32767/16, 10*32767/16, 11*32767/16,
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12*32767/16, 13*32767/16, 14*32767/16, 15*32767/16
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};
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void DOSBoxCMS::write(int a, int v) {
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switch (a-_basePort) {
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case 0:
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portWriteIntern(0, 0, v);
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break;
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case 1:
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portWriteIntern(0, 1, v);
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break;
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case 2:
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portWriteIntern(1, 0, v);
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break;
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case 3:
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portWriteIntern(1, 1, v);
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break;
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default:
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warning("DOSBoxCMS got port: 0x%X", a);
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break;
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}
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}
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void DOSBoxCMS::writeReg(int r, int v) {
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int chip = 0;
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if (r >= 0x100)
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chip = 1;
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portWriteIntern(chip, 1, r & 0x1F);
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portWriteIntern(chip, 0, v);
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}
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void DOSBoxCMS::generateSamples(int16 *buffer, const int numSamples) {
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update(0, &buffer[0], numSamples);
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update(1, &buffer[0], numSamples);
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}
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bool DOSBoxCMS::init() {
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reset();
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return true;
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}
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void DOSBoxCMS::reset() {
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memset(_saa1099, 0, sizeof(SAA1099) * 2);
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}
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void DOSBoxCMS::envelope(int chip, int ch) {
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SAA1099 *saa = &_saa1099[chip];
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if (saa->env_enable[ch]) {
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int step, mode, mask;
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mode = saa->env_mode[ch];
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/* step from 0..63 and then loop in steps 32..63 */
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step = saa->env_step[ch] = ((saa->env_step[ch] + 1) & 0x3f) | (saa->env_step[ch] & 0x20);
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mask = 15;
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if (saa->env_bits[ch])
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mask &= ~1; /* 3 bit resolution, mask LSB */
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saa->channels[ch*3+0].envelope[ LEFT] =
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saa->channels[ch*3+1].envelope[ LEFT] =
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saa->channels[ch*3+2].envelope[ LEFT] = ::envelope[mode][step] & mask;
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if (saa->env_reverse_right[ch] & 0x01) {
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saa->channels[ch*3+0].envelope[RIGHT] =
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saa->channels[ch*3+1].envelope[RIGHT] =
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saa->channels[ch*3+2].envelope[RIGHT] = (15 - ::envelope[mode][step]) & mask;
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} else {
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saa->channels[ch*3+0].envelope[RIGHT] =
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saa->channels[ch*3+1].envelope[RIGHT] =
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saa->channels[ch*3+2].envelope[RIGHT] = ::envelope[mode][step] & mask;
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}
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} else {
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/* envelope mode off, set all envelope factors to 16 */
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saa->channels[ch*3+0].envelope[ LEFT] =
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saa->channels[ch*3+1].envelope[ LEFT] =
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saa->channels[ch*3+2].envelope[ LEFT] =
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saa->channels[ch*3+0].envelope[RIGHT] =
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saa->channels[ch*3+1].envelope[RIGHT] =
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saa->channels[ch*3+2].envelope[RIGHT] = 16;
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}
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}
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void DOSBoxCMS::update(int chip, int16 *buffer, int length) {
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struct SAA1099 *saa = &_saa1099[chip];
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int32 rate;
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int j, ch;
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if (chip == 0) {
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memset(buffer, 0, sizeof(int16)*length);
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}
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/* if the channels are disabled we're done */
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if (!saa->all_ch_enable) {
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return;
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}
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for (ch = 0; ch < 2; ch++) {
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switch (saa->noise_params[ch]) {
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case 0: saa->noise[ch].freq = (MASTER_CLOCK * 2) / 256; break;
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case 1: saa->noise[ch].freq = (MASTER_CLOCK * 2) / 512; break;
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case 2: saa->noise[ch].freq = (MASTER_CLOCK * 2) / 1024; break;
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case 3: saa->noise[ch].freq = saa->channels[ch * 3].freq; break;
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default: break;
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}
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}
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rate = getRate() * FRAC_ONE_CMS;
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/* fill all data needed */
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for (j = 0; j < length / 2; ++j) {
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int output_l = 0, output_r = 0;
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/* for each channel */
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for (ch = 0; ch < 6; ch++) {
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if (saa->channels[ch].freq == 0)
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saa->channels[ch].freq = (((2 * MASTER_CLOCK) / 512) << saa->channels[ch].octave) /
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(511 - saa->channels[ch].frequency);
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/* check the actual position in the square wave */
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saa->channels[ch].counter -= saa->channels[ch].freq;
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while (saa->channels[ch].counter < 0) {
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/* calculate new frequency now after the half wave is updated */
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saa->channels[ch].freq = (((2 * MASTER_CLOCK) / 512) << saa->channels[ch].octave) /
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(511 - saa->channels[ch].frequency);
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saa->channels[ch].counter += rate;
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saa->channels[ch].level ^= 1;
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/* eventually clock the envelope counters */
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if (ch == 1 && saa->env_clock[0] == 0)
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envelope(chip, 0);
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if (ch == 4 && saa->env_clock[1] == 0)
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envelope(chip, 1);
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}
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/* if the noise is enabled */
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if (saa->channels[ch].noise_enable) {
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/* if the noise level is high (noise 0: chan 0-2, noise 1: chan 3-5) */
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if (saa->noise[ch/3].level & 1) {
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/* subtract to avoid overflows, also use only half amplitude */
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output_l -= saa->channels[ch].amplitude[ LEFT] * saa->channels[ch].envelope[ LEFT] / 16 / 2;
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output_r -= saa->channels[ch].amplitude[RIGHT] * saa->channels[ch].envelope[RIGHT] / 16 / 2;
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}
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}
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/* if the square wave is enabled */
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if (saa->channels[ch].freq_enable) {
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/* if the channel level is high */
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if (saa->channels[ch].level & 1) {
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output_l += saa->channels[ch].amplitude[ LEFT] * saa->channels[ch].envelope[ LEFT] / 16;
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output_r += saa->channels[ch].amplitude[RIGHT] * saa->channels[ch].envelope[RIGHT] / 16;
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}
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}
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}
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for (ch = 0; ch < 2; ch++) {
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/* check the actual position in noise generator */
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saa->noise[ch].counter -= saa->noise[ch].freq;
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while (saa->noise[ch].counter < 0) {
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saa->noise[ch].counter += rate;
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if (((saa->noise[ch].level & 0x4000) == 0) == ((saa->noise[ch].level & 0x0040) == 0) )
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saa->noise[ch].level = (saa->noise[ch].level << 1) | 1;
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else
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saa->noise[ch].level <<= 1;
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}
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}
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/* write sound data to the buffer */
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buffer[j*2+0] = CLIP<int>(buffer[j*2+0] + output_l / 6, -32768, 32767);
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buffer[j*2+1] = CLIP<int>(buffer[j*2+1] + output_r / 6, -32768, 32767);
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}
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}
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void DOSBoxCMS::portWriteIntern(int chip, int offset, int data) {
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SAA1099 *saa = &_saa1099[chip];
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if(offset == 1) {
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// address port
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saa->selected_reg = data & 0x1f;
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if (saa->selected_reg == 0x18 || saa->selected_reg == 0x19) {
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/* clock the envelope channels */
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if (saa->env_clock[0])
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envelope(chip,0);
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if (saa->env_clock[1])
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envelope(chip,1);
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}
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return;
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}
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int reg = saa->selected_reg;
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int ch;
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switch (reg) {
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/* channel i amplitude */
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case 0x00:
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case 0x01:
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case 0x02:
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case 0x03:
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case 0x04:
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case 0x05:
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ch = reg & 7;
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saa->channels[ch].amplitude[LEFT] = amplitude_lookup[data & 0x0f];
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saa->channels[ch].amplitude[RIGHT] = amplitude_lookup[(data >> 4) & 0x0f];
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break;
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/* channel i frequency */
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case 0x08:
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case 0x09:
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case 0x0a:
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case 0x0b:
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case 0x0c:
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case 0x0d:
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ch = reg & 7;
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saa->channels[ch].frequency = data & 0xff;
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break;
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/* channel i octave */
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case 0x10:
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case 0x11:
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case 0x12:
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ch = (reg - 0x10) << 1;
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saa->channels[ch + 0].octave = data & 0x07;
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saa->channels[ch + 1].octave = (data >> 4) & 0x07;
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break;
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/* channel i frequency enable */
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case 0x14:
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saa->channels[0].freq_enable = data & 0x01;
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saa->channels[1].freq_enable = data & 0x02;
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saa->channels[2].freq_enable = data & 0x04;
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saa->channels[3].freq_enable = data & 0x08;
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saa->channels[4].freq_enable = data & 0x10;
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saa->channels[5].freq_enable = data & 0x20;
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break;
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/* channel i noise enable */
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case 0x15:
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saa->channels[0].noise_enable = data & 0x01;
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saa->channels[1].noise_enable = data & 0x02;
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saa->channels[2].noise_enable = data & 0x04;
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saa->channels[3].noise_enable = data & 0x08;
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saa->channels[4].noise_enable = data & 0x10;
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saa->channels[5].noise_enable = data & 0x20;
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break;
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/* noise generators parameters */
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case 0x16:
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saa->noise_params[0] = data & 0x03;
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saa->noise_params[1] = (data >> 4) & 0x03;
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break;
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/* envelope generators parameters */
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case 0x18:
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case 0x19:
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ch = reg - 0x18;
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saa->env_reverse_right[ch] = data & 0x01;
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saa->env_mode[ch] = (data >> 1) & 0x07;
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saa->env_bits[ch] = data & 0x10;
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saa->env_clock[ch] = data & 0x20;
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saa->env_enable[ch] = data & 0x80;
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/* reset the envelope */
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saa->env_step[ch] = 0;
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break;
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/* channels enable & reset generators */
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case 0x1c:
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saa->all_ch_enable = data & 0x01;
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saa->sync_state = data & 0x02;
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if (data & 0x02) {
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int i;
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/* Synch & Reset generators */
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for (i = 0; i < 6; i++) {
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saa->channels[i].level = 0;
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saa->channels[i].counter = 0;
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}
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}
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break;
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default:
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// The CMS allows all registers to be written, so we just output some debug
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// message here
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debug(5, "CMS Unknown write to reg %x with %x",reg, data);
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}
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}
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class CMSMusicPlugin : public NullMusicPlugin {
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public:
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const char *getName() const override {
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return _s("Creative Music System emulator");
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}
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const char *getId() const override {
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return "cms";
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}
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MusicDevices getDevices() const override;
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};
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MusicDevices CMSMusicPlugin::getDevices() const {
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MusicDevices devices;
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devices.push_back(MusicDevice(this, "", MT_CMS));
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return devices;
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}
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//#if PLUGIN_ENABLED_DYNAMIC(CMS)
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//REGISTER_PLUGIN_DYNAMIC(CMS, PLUGIN_TYPE_MUSIC, CMSMusicPlugin);
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//#else
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REGISTER_PLUGIN_STATIC(CMS, PLUGIN_TYPE_MUSIC, CMSMusicPlugin);
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//#endif
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