mirror of
https://github.com/ZDoom/ZMusic.git
synced 2024-12-02 16:42:32 +00:00
faa997b986
Changelog: * Added an ability to disable the automatical arpeggio * Updated the GENS chip emulator from the 2.10 into GS/II (thanks to @freq-mod for the help) * Added an ability to set number of loops * Added an ability to disable/enable playing of selected MIDI channels * Fixed memory damages and crashes while playing XMI files * Added the chip channels allocation mode option * Fixed the playback of multi-song XMI files * Added an ability to switch the XMI song on the fly And also: * Fixed the work on big endian processors * Fixed ARM64 build on some platforms * Improved support of the EA-MUS files (Thanks to [dashodanger](https://github.com/dashodanger)) * Fixed crash on attempt to change the volume of a blank note
110 lines
2.8 KiB
C++
110 lines
2.8 KiB
C++
/*
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* Interfaces over Yamaha OPN2 (YM2612) chip emulators
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*
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* Copyright (c) 2017-2022 Vitaly Novichkov (Wohlstand)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* 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.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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#include "gens_opn2.h"
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#include <cstdio>
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#include <cstring>
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#include <cassert>
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#include "gens/Ym2612.hpp"
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#ifndef INT16_MIN
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#define INT16_MIN (-0x7fff - 1)
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#endif
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#ifndef INT16_MAX
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#define INT16_MAX 0x7fff
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#endif
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GensOPN2::GensOPN2(OPNFamily f)
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: OPNChipBaseBufferedT(f),
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chip(new LibGens::Ym2612())
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{
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setRate(m_rate, m_clock);
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}
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GensOPN2::~GensOPN2()
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{
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delete chip;
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}
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void GensOPN2::setRate(uint32_t rate, uint32_t clock)
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{
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OPNChipBaseBufferedT::setRate(rate, clock);
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uint32_t chipRate = isRunningAtPcmRate() ? rate : nativeRate();
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chip->reInit(clock, chipRate); // implies reset()
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}
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void GensOPN2::reset()
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{
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OPNChipBaseBufferedT::reset();
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chip->reset();
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}
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void GensOPN2::writeReg(uint32_t port, uint16_t addr, uint8_t data)
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{
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LibGens::Ym2612 *chip = this->chip;
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switch (port)
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{
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case 0:
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chip->write(0, addr);
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chip->write(1, data);
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break;
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case 1:
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chip->write(2, addr);
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chip->write(3, data);
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break;
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}
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}
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void GensOPN2::writePan(uint16_t chan, uint8_t data)
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{
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chip->write_pan(static_cast<int>(chan), static_cast<int>(data));
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}
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void GensOPN2::nativeGenerateN(int16_t *output, size_t frames)
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{
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enum { maxFrames = 256 };
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assert(frames <= maxFrames);
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LibGens::Ym2612 *chip = this->chip;
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int32_t bufLR[2 * maxFrames] = {};
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int32_t *bufL = &bufLR[0];
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int32_t *bufR = &bufLR[maxFrames];
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chip->resetBufferPtrs(bufL, bufR);
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chip->addWriteLen((int)frames);
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chip->specialUpdate();
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//TODO
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// chip->updateDacAndTimers(bufL, bufR, frames);
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for (size_t i = 0; i < 2 * frames; ++i) {
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int32_t sample = ((i & 1) ? bufR : bufL)[i / 2];
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sample /= 4; // has too high volume, attenuation needed
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sample = (sample < INT16_MIN) ? INT16_MIN : sample;
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sample = (sample > INT16_MAX) ? INT16_MAX : sample;
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output[i] = (int16_t)sample;
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}
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}
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const char *GensOPN2::emulatorName()
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{
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return "GENS/GS II OPN2";
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}
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