mirror of
https://github.com/scummvm/scummvm.git
synced 2026-05-21 05:40:43 +00:00
Miro Kropacek
67 lines
1.9 KiB
C++
67 lines
1.9 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 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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#define FORBIDDEN_SYMBOL_ALLOW_ALL
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#include "audio/atari_ym2149.h"
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#include <mint/falcon.h>
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#include <mint/osbind.h>
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namespace Audio {
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YM2149Atari::YM2149Atari() {
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for (int r = 0; r < 14; r++) {
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_savedRegs[r] = Giaccess(0, r);
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}
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}
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YM2149Atari::~YM2149Atari() {
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for (int r = 0; r < 14; r++) {
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Giaccess(_savedRegs[r], r | 0x80);
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}
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}
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bool YM2149Atari::init() {
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// route both PSG channels to the ADC instead of the microphone
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Soundcmd(ADCINPUT, ADCLT|ADCRT);
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// enable and mix both sources (ADC and connection matrix) to the output
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Soundcmd(ADDERIN, MATIN|ADCIN);
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return true;
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}
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void YM2149Atari::reset() {
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// silence channels/envelope, but keep ports as outputs
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writeReg(7, 0xFF); // all tone+noise off, PA/PB output
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writeReg(8, 0); // volume A
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writeReg(9, 0); // volume B
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writeReg(10, 0); // volume C
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// skip reg 13 (envelope shape) — writing it retriggers the envelope
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}
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void YM2149Atari::writeReg(int r, uint8 v) {
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if (r == 7)
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v |= 0xC0; // keep Port A/B as outputs
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Giaccess(v, r | 0x80);
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}
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} // End of namespace Audio
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