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◆ main openmsx / src / sound / YM2413.cc
3.4 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "YM2413.hh"
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#include "YM2413Burczynski.hh"
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#include "YM2413NukeYKT.hh"
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#include "YM2413Okazaki.hh"
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#include "YM2413OriginalNukeYKT.hh"
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#include "DeviceConfig.hh"
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#include "MSXException.hh"
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#include "serialize.hh"
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#include "cstd.hh"
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#include "narrow.hh"
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#include "outer.hh"
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#include <memory>
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namespace openmsx {
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// Debuggable
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YM2413::Debuggable::Debuggable(
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		MSXMotherBoard& motherBoard_, const std::string& name_)
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	: SimpleDebuggable(motherBoard_, name_ + " regs", "MSX-MUSIC", 0x40)
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{
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}
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uint8_t YM2413::Debuggable::read(unsigned address)
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{
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	const auto& ym2413 = OUTER(YM2413, debuggable);
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	return ym2413.core->peekRegs()[address];
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}
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void YM2413::Debuggable::write(unsigned address, uint8_t value, EmuTime time)
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{
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	auto& ym2413 = OUTER(YM2413, debuggable);
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	ym2413.pokeReg(narrow<uint8_t>(address), value, time);
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}
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// YM2413
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static std::unique_ptr<YM2413Core> createCore(const DeviceConfig& config)
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{
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	auto core = config.getChildData("ym2413-core", "");
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	if (core == "Okazaki") {
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		return std::make_unique<YM2413Okazaki::YM2413>();
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	} else if (core == "Burczynski") {
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		return std::make_unique<YM2413Burczynski::YM2413>();
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	} else if (core == "NukeYKT") {
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		return std::make_unique<YM2413NukeYKT::YM2413>();
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	} else if (core == "Original-NukeYKT") {
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		return std::make_unique<YM2413OriginalNukeYKT::YM2413>(); // for debug
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	} else if (core.empty()) {
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		// The preferred way to select the core is via the <core> tag.
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		// But for backwards compatibility, when that tag is missing,
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		// fallback to using the <alternative> tag.
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		if (config.getChildDataAsBool("alternative", false)) {
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			return std::make_unique<YM2413Burczynski::YM2413>();
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		} else {
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			return std::make_unique<YM2413Okazaki::YM2413>();
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		}
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	}
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	throw MSXException("Unknown YM2413 core '", core,
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	                   "'. Must be one of 'Okazaki', 'Burczynski', 'NukeYKT', 'Original-NukeYKT'.");
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}
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static constexpr auto INPUT_RATE = unsigned(cstd::round(YM2413Core::CLOCK_FREQ / 72.0));
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YM2413::YM2413(const std::string& name_, const DeviceConfig& config)
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	: ResampledSoundDevice(config.getMotherBoard(), name_, "MSX-MUSIC", 9 + 5, INPUT_RATE, false)
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	, core(createCore(config))
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	, debuggable(config.getMotherBoard(), getName())
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{
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	registerSound(config);
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}
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YM2413::~YM2413()
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{
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	unregisterSound();
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}
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void YM2413::reset(EmuTime time)
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{
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	updateStream(time);
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	core->reset();
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}
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void YM2413::writePort(bool port, uint8_t value, EmuTime time)
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{
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	updateStream(time);
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	auto [integral, fractional] = getEmuClock().getTicksTillAsIntFloat(time);
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	auto offset = narrow_cast<int>(18 * fractional);
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	assert(integral == 0);
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	assert(offset >= 0);
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	assert(offset < 18);
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	core->writePort(port, value, offset);
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}
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void YM2413::pokeReg(uint8_t reg, uint8_t value, EmuTime time)
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{
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	updateStream(time);
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	core->pokeReg(reg, value);
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}
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std::span<const uint8_t, 64> YM2413::peekRegs() const
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{
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	return core->peekRegs();
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}
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void YM2413::setOutputRate(unsigned hostSampleRate, double speed)
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{
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	ResampledSoundDevice::setOutputRate(hostSampleRate, speed);
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	core->setSpeed(speed);
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}
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void YM2413::generateChannels(std::span<float*> bufs, unsigned num)
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{
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	assert(bufs.size() == 9 + 5);
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	core->generateChannels(bufs.first<9 + 5>(), num);
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}
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float YM2413::getAmplificationFactorImpl() const
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{
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	return core->getAmplificationFactor();
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}
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template<typename Archive>
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void YM2413::serialize(Archive& ar, unsigned /*version*/)
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{
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	ar.serializePolymorphic("ym2413", *core);
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}
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INSTANTIATE_SERIALIZE_METHODS(YM2413);
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} // namespace openmsx