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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 "esfmu_opl3.h"
#include "esfmu/esfm.h"
#include <cstring>
ESFMuOPL3::ESFMuOPL3() :
OPLChipBaseT(),
m_headPos(0),
m_tailPos(0),
m_queueCount(0)
{
m_chip = new esfm_chip;
ESFMuOPL3::setRate(m_rate);
}
ESFMuOPL3::~ESFMuOPL3()
{
esfm_chip *chip_r = reinterpret_cast<esfm_chip*>(m_chip);
delete chip_r;
}
void ESFMuOPL3::setRate(uint32_t rate)
{
OPLChipBaseT::setRate(rate);
esfm_chip *chip_r = reinterpret_cast<esfm_chip*>(m_chip);
std::memset(chip_r, 0, sizeof(esfm_chip));
ESFM_init(chip_r/*, rate*/);
}
void ESFMuOPL3::reset()
{
OPLChipBaseT::reset();
esfm_chip *chip_r = reinterpret_cast<esfm_chip*>(m_chip);
std::memset(chip_r, 0, sizeof(esfm_chip));
ESFM_init(chip_r/*, m_rate*/);
}
void ESFMuOPL3::writeReg(uint16_t addr, uint8_t data)
{
Reg &back = m_queue[m_headPos++];
back.addr = addr;
back.data = data;
if(m_headPos >= c_queueSize)
m_headPos = 0;
++m_queueCount;
// esfm_chip *chip_r = reinterpret_cast<esfm_chip*>(m_chip);
// ESFM_write_reg_buffered(chip_r, addr, data);
}
void ESFMuOPL3::writePan(uint16_t addr, uint8_t data)
{
// FIXME: Implement panning support
// esfm_chip *chip_r = reinterpret_cast<esfm_chip*>(m_chip);
// ESFM_write?pan(chip_r, addr, data);
(void)(addr);
(void)(data);
}
void ESFMuOPL3::nativeGenerate(int16_t *frame)
{
esfm_chip *chip_r = reinterpret_cast<esfm_chip*>(m_chip);
uint32_t addr = 0xffff, data;
// see if there is data to be written; if so, extract it and dequeue
if(m_queueCount > 0)
{
const Reg &front = m_queue[m_tailPos++];
if(m_tailPos >= c_queueSize)
m_tailPos = 0;
--m_queueCount;
addr = front.addr;
data = front.data;
}
// write to the chip
if(addr != 0xffff)
ESFM_write_reg(chip_r, addr, data);
ESFM_generate(chip_r, frame);
}
const char *ESFMuOPL3::emulatorName()
{
return "ESFMu";
}
OPLChipBase::ChipType ESFMuOPL3::chipType()
{
return CHIPTYPE_OPL3;
}
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