YM2413.cc

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#include "YM2413.hh"
#include "YM2413Okazaki.hh"
#include "YM2413Burczynski.hh"
#include "YM2413NukeYKT.hh"
#include "YM2413OriginalNukeYKT.hh"
#include "DeviceConfig.hh"
#include "MSXException.hh"
#include "serialize.hh"
#include "cstd.hh"
#include "narrow.hh"
#include "outer.hh"
#include <cmath>
#include <memory>
 
namespace openmsx {
 
// Debuggable
 
YM2413::Debuggable::Debuggable(
                MSXMotherBoard& motherBoard_, const std::string& name_)
        : SimpleDebuggable(motherBoard_, name_ + " regs", "MSX-MUSIC", 0x40)
{
}
 
byte YM2413::Debuggable::read(unsigned address)
{
        auto& ym2413 = OUTER(YM2413, debuggable);
        return ym2413.core->peekReg(narrow<uint8_t>(address));
}
 
void YM2413::Debuggable::write(unsigned address, byte value, EmuTime::param time)
{
        auto& ym2413 = OUTER(YM2413, debuggable);
        ym2413.pokeReg(narrow<uint8_t>(address), value, time);
}
 
 
// YM2413
 
static std::unique_ptr<YM2413Core> createCore(const DeviceConfig& config)
{
        auto core = config.getChildData("ym2413-core", "");
        if (core == "Okazaki") {
                return std::make_unique<YM2413Okazaki::YM2413>();
        } else if (core == "Burczynski") {
                return std::make_unique<YM2413Burczynski::YM2413>();
        } else if (core == "NukeYKT") {
                return std::make_unique<YM2413NukeYKT::YM2413>();
        } else if (core == "Original-NukeYKT") {
                return std::make_unique<YM2413OriginalNukeYKT::YM2413>(); // for debug
        } else if (core.empty()) {
                // The preferred way to select the core is via the <core> tag.
                // But for backwards compatibility, when that tag is missing,
                // fallback to using the <alternative> tag.
                if (config.getChildDataAsBool("alternative", false)) {
                        return std::make_unique<YM2413Burczynski::YM2413>();
                } else {
                        return std::make_unique<YM2413Okazaki::YM2413>();
                }
        }
        throw MSXException("Unknown YM2413 core '", core,
                           "'. Must be one of 'Okazaki', 'Burczynski', 'NukeYKT', 'Original-NukeYKT'.");
}
 
static constexpr auto INPUT_RATE = unsigned(cstd::round(YM2413Core::CLOCK_FREQ / 72.0));
 
YM2413::YM2413(const std::string& name_, const DeviceConfig& config)
        : ResampledSoundDevice(config.getMotherBoard(), name_, "MSX-MUSIC", 9 + 5, INPUT_RATE, false)
        , core(createCore(config))
        , debuggable(config.getMotherBoard(), getName())
{
        registerSound(config);
}
 
YM2413::~YM2413()
{
        unregisterSound();
}
 
void YM2413::reset(EmuTime::param time)
{
        updateStream(time);
        core->reset();
}
 
void YM2413::writePort(bool port, byte value, EmuTime::param time)
{
        updateStream(time);
 
        auto [integral, fractional] = getEmuClock().getTicksTillAsIntFloat(time);
        auto offset = narrow_cast<int>(18 * fractional);
        assert(integral == 0);
        assert(offset >= 0);
        assert(offset < 18);
 
        core->writePort(port, value, offset);
}
 
void YM2413::pokeReg(byte reg, byte value, EmuTime::param time)
{
        updateStream(time);
        core->pokeReg(reg, value);
}
 
void YM2413::setOutputRate(unsigned hostSampleRate, double speed)
{
        ResampledSoundDevice::setOutputRate(hostSampleRate, speed);
        core->setSpeed(speed);
}
 
void YM2413::generateChannels(std::span<float*> bufs, unsigned num)
{
        assert(bufs.size() == 9 + 5);
        core->generateChannels(bufs.first<9 + 5>(), num);
}
 
float YM2413::getAmplificationFactorImpl() const
{
        return core->getAmplificationFactor();
}
 
 
template<typename Archive>
void YM2413::serialize(Archive& ar, unsigned /*version*/)
{
        ar.serializePolymorphic("ym2413", *core);
}
INSTANTIATE_SERIALIZE_METHODS(YM2413);
 
} // namespace openmsx