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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 "ymfm_opl3.h"
#include "ymfm/ymfm_opl.h"
#include <cstring>
YmFmOPL3::YmFmOPL3() :
OPLChipBaseT(),
m_headPos(0),
m_tailPos(0),
m_queueCount(0)
{
ymfm::ymfm_interface* intf = new ymfm::ymfm_interface;
m_intf = intf;
m_chip = new ymfm::ymf262(*intf);
setRate(m_rate);
}
YmFmOPL3::~YmFmOPL3()
{
ymfm::ymf262 *chip_r = reinterpret_cast<ymfm::ymf262*>(m_chip);
ymfm::ymfm_interface *intf_r = reinterpret_cast<ymfm::ymfm_interface*>(m_intf);
delete chip_r;
delete intf_r;
}
void YmFmOPL3::setRate(uint32_t rate)
{
OPLChipBaseT::setRate(rate);
ymfm::ymf262 *chip_r = reinterpret_cast<ymfm::ymf262*>(m_chip);
chip_r->reset();
}
void YmFmOPL3::reset()
{
OPLChipBaseT::reset();
ymfm::ymf262 *chip_r = reinterpret_cast<ymfm::ymf262*>(m_chip);
chip_r->reset();
}
void YmFmOPL3::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;
}
void YmFmOPL3::nativeGenerate(int16_t *frame)
{
ymfm::ymf262 *chip_r = reinterpret_cast<ymfm::ymf262*>(m_chip);
ymfm::ymf262::output_data frames_i;
uint32_t addr1 = 0xffff, addr2 = 0xffff;
uint8_t data1 = 0, data2 = 0;
// 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;
addr1 = 0 + 2 * ((front.addr >> 8) & 3);
data1 = front.addr & 0xff;
addr2 = addr1 + 1;
data2 = front.data;
}
// write to the chip
if(addr1 != 0xffff)
{
chip_r->write(addr1, data1);
chip_r->write(addr2, data2);
}
chip_r->generate(&frames_i);
frame[0] = static_cast<int16_t>(ymfm::clamp(frames_i.data[0] / 2, -32768, 32767));
frame[1] = static_cast<int16_t>(ymfm::clamp(frames_i.data[1] / 2, -32768, 32767));
}
const char *YmFmOPL3::emulatorName()
{
return "YMFM OPL3";
}
OPLChipBase::ChipType YmFmOPL3::chipType()
{
return CHIPTYPE_OPL3;
}
bool YmFmOPL3::hasFullPanning()
{
return false;
}
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