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/*
* Interfaces over Yamaha OPL3 (YMF262) chip emulators
*
* Copyright (c) 2017-2025 Vitaly Novichkov (Wohlstand)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "java_opl3.h"
#include "java/JavaOPL3.hpp"
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#ifndef M_SQRT1_2
#define M_SQRT1_2 0.70710678118654752440
#endif
JavaOPL3::JavaOPL3() :
OPLChipBaseBufferedT(),
m_chip(new ADL_JavaOPL3::OPL3(true))
{
JavaOPL3::reset();
}
JavaOPL3::~JavaOPL3()
{
ADL_JavaOPL3::OPL3 *chip_r = reinterpret_cast<ADL_JavaOPL3::OPL3 *>(m_chip);
delete chip_r;
}
void JavaOPL3::setRate(uint32_t rate)
{
OPLChipBaseBufferedT::setRate(rate);
ADL_JavaOPL3::OPL3 *chip_r = reinterpret_cast<ADL_JavaOPL3::OPL3 *>(m_chip);
chip_r->Reset();
float pan = sinf((float)M_SQRT1_2);
for (unsigned channel = 0; channel < 18; ++channel)
chip_r->SetPanning(channel, pan, pan);
}
void JavaOPL3::reset()
{
OPLChipBaseBufferedT::reset();
ADL_JavaOPL3::OPL3 *chip_r = reinterpret_cast<ADL_JavaOPL3::OPL3 *>(m_chip);
chip_r->Reset();
}
void JavaOPL3::writeReg(uint16_t addr, uint8_t data)
{
ADL_JavaOPL3::OPL3 *chip_r = reinterpret_cast<ADL_JavaOPL3::OPL3 *>(m_chip);
chip_r->WriteReg(addr, data);
}
void JavaOPL3::writePan(uint16_t addr, uint8_t data)
{
ADL_JavaOPL3::OPL3 *chip_r = reinterpret_cast<ADL_JavaOPL3::OPL3 *>(m_chip);
unsigned high = (addr >> 8) & 0x01;
unsigned regm = addr & 0xff;
unsigned channel = 9 * high + (regm & 0x0f);
float phase = (data == 63 || data == 64) ? 63.5f : (float)data;
phase *= (float)(M_PI / 2 / 127);
chip_r->SetPanning(channel, cosf(phase), sinf(phase));
}
void JavaOPL3::nativeGenerateN(int16_t *output, size_t frames)
{
ADL_JavaOPL3::OPL3 *chip_r = reinterpret_cast<ADL_JavaOPL3::OPL3 *>(m_chip);
enum { maxframes = 256 };
float buf[2 * maxframes];
while(frames > 0)
{
memset(buf, 0, sizeof(buf));
size_t curframes = (frames < (size_t)maxframes) ? frames : (size_t)maxframes;
chip_r->Update(buf, (int)curframes);
size_t cursamples = 2 * curframes;
for(size_t i = 0; i < cursamples; ++i)
{
int32_t sample = (int32_t)lround(4096 * buf[i]);
sample = (sample > -32768) ? sample : -32768;
sample = (sample < +32767) ? sample : +32767;
output[i] = (int16_t)sample;
}
output += cursamples;
frames -= curframes;
}
}
const char *JavaOPL3::emulatorName()
{
return "Java 1.0.6 OPL3";
}
bool JavaOPL3::hasFullPanning()
{
return true;
}
OPLChipBase::ChipType JavaOPL3::chipType()
{
return CHIPTYPE_OPL3;
}
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