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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 <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#ifdef __DJGPP__
# include <pc.h>
#endif
#include "dos_hw_opl.h"
static uint16_t s_OPLBase[2] = {0x388, 0x38A};
static char s_devName[80] = {0};
static OPLChipBase::ChipType s_type = OPLChipBase::CHIPTYPE_OPL3;
static bool s_detected = false;
static void s_updateDevName()
{
const char *oplName = (s_type == OPLChipBase::CHIPTYPE_OPL3) ? "OPL3" : "OPL2";
memset(s_devName, 0, sizeof(s_devName));
snprintf(s_devName, 80, "%s at 0x%03X", oplName, s_OPLBase[0]);
}
static void s_detect()
{
if(s_detected)
return;
const char *blaster = getenv("BLASTER");
if(blaster)
{
size_t len = strlen(blaster);
for(size_t i = 0; i < len - 1; ++i)
{
if(blaster[i] == 'T')
{
switch(blaster[i + 1])
{
case '1':
case '2':
s_type = OPLChipBase::CHIPTYPE_OPL2;
break;
case '3':
case '4':
case '6':
s_type = OPLChipBase::CHIPTYPE_OPL3;
break;
default:
s_type = OPLChipBase::CHIPTYPE_OPL2;
break;
}
// printf("-- Detected BLASTER T%c\n", blaster[i + 1]);
break;
}
}
}
else
s_type = OPLChipBase::CHIPTYPE_OPL2;
s_detected = true;
}
DOS_HW_OPL::DOS_HW_OPL()
{
s_detect();
s_updateDevName();
}
void DOS_HW_OPL::setOplAddress(uint16_t address)
{
s_OPLBase[0] = address;
s_OPLBase[1] = address + 2;
s_updateDevName();
}
void DOS_HW_OPL::setChipType(ChipType type)
{
s_type = type;
s_detected = true; // Assignd manually, no need to detect
}
DOS_HW_OPL::~DOS_HW_OPL()
{
DOS_HW_OPL::writeReg(0x0BD, 0);
if(s_type == CHIPTYPE_OPL3)
{
DOS_HW_OPL::writeReg(0x104, 0);
DOS_HW_OPL::writeReg(0x105, 0);
}
}
void DOS_HW_OPL::writeReg(uint16_t addr, uint8_t data)
{
assert(m_id <= 1);
unsigned o = addr >> 8;
unsigned port = s_OPLBase[m_id] + o * 2;
# ifdef __DJGPP__
outportb(port, addr);
for(unsigned c = 0; c < 6; ++c)
inportb(port);
outportb(port + 1, data);
for(unsigned c = 0; c < 35; ++c)
inportb(port);
# endif
# ifdef __WATCOMC__
outp(port, addr);
for(uint16_t c = 0; c < 6; ++c)
inp(port);
outp(port + 1, data);
for(uint16_t c = 0; c < 35; ++c)
inp(port);
# endif//__WATCOMC__
}
void DOS_HW_OPL::nativeGenerate(int16_t *frame)
{
frame[0] = 0;
frame[1] = 0;
}
const char *DOS_HW_OPL::emulatorName()
{
return s_devName;
}
bool DOS_HW_OPL::hasFullPanning()
{
return false;
}
OPLChipBase::ChipType DOS_HW_OPL::chipType()
{
return s_type;
}
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