mirror of
https://github.com/ZDoom/gzdoom-gles.git
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117 lines
3.2 KiB
C++
117 lines
3.2 KiB
C++
/*
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* Interfaces over Yamaha OPL3 (YMF262) chip emulators
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*
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* Copyright (c) 2017-2020 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 "java_opl3.h"
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#include "java/JavaOPL3.hpp"
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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#ifndef M_SQRT1_2
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#define M_SQRT1_2 0.70710678118654752440
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#endif
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JavaOPL3::JavaOPL3() :
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OPLChipBaseBufferedT(),
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m_chip(new ADL_JavaOPL3::OPL3(true))
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{
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reset();
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}
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JavaOPL3::~JavaOPL3()
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{
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ADL_JavaOPL3::OPL3 *chip_r = reinterpret_cast<ADL_JavaOPL3::OPL3 *>(m_chip);
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delete chip_r;
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}
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void JavaOPL3::setRate(uint32_t rate)
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{
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OPLChipBaseBufferedT::setRate(rate);
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ADL_JavaOPL3::OPL3 *chip_r = reinterpret_cast<ADL_JavaOPL3::OPL3 *>(m_chip);
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chip_r->Reset();
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float pan = sinf((float)M_SQRT1_2);
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for (unsigned channel = 0; channel < 18; ++channel)
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chip_r->SetPanning(channel, pan, pan);
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}
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void JavaOPL3::reset()
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{
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OPLChipBaseBufferedT::reset();
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ADL_JavaOPL3::OPL3 *chip_r = reinterpret_cast<ADL_JavaOPL3::OPL3 *>(m_chip);
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chip_r->Reset();
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}
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void JavaOPL3::writeReg(uint16_t addr, uint8_t data)
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{
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ADL_JavaOPL3::OPL3 *chip_r = reinterpret_cast<ADL_JavaOPL3::OPL3 *>(m_chip);
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chip_r->WriteReg(addr, data);
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}
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void JavaOPL3::writePan(uint16_t addr, uint8_t data)
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{
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ADL_JavaOPL3::OPL3 *chip_r = reinterpret_cast<ADL_JavaOPL3::OPL3 *>(m_chip);
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unsigned high = (addr >> 8) & 0x01;
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unsigned regm = addr & 0xff;
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unsigned channel = 9 * high + (regm & 0x0f);
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float phase = (data == 63 || data == 64) ? 63.5f : (float)data;
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phase *= (float)(M_PI / 2 / 127);
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chip_r->SetPanning(channel, cosf(phase), sinf(phase));
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}
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void JavaOPL3::nativeGenerateN(int16_t *output, size_t frames)
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{
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ADL_JavaOPL3::OPL3 *chip_r = reinterpret_cast<ADL_JavaOPL3::OPL3 *>(m_chip);
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enum { maxframes = 256 };
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float buf[2 * maxframes];
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while(frames > 0)
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{
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memset(buf, 0, sizeof(buf));
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size_t curframes = (frames < (size_t)maxframes) ? frames : (size_t)maxframes;
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chip_r->Update(buf, (int)curframes);
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size_t cursamples = 2 * curframes;
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for(size_t i = 0; i < cursamples; ++i)
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{
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int32_t sample = (int32_t)lround(4096 * buf[i]);
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sample = (sample > -32768) ? sample : -32768;
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sample = (sample < +32767) ? sample : +32767;
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output[i] = (int16_t)sample;
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}
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output += cursamples;
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frames -= curframes;
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}
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}
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const char *JavaOPL3::emulatorName()
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{
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return "Java 1.0.6 OPL3";
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}
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OPLChipBase::ChipType JavaOPL3::chipType()
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{
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return CHIPTYPE_OPL3;
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}
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