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◆ main openmsx / src / input / Paddle.cc
2.7 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
e8555c89 Andy McCall 1 
#include "Paddle.hh"
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#include "MSXEventDistributor.hh"
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#include "StateChange.hh"
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#include "StateChangeDistributor.hh"
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#include "Event.hh"
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#include "serialize.hh"
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#include "serialize_meta.hh"
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#include <algorithm>
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namespace openmsx {
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Paddle::Paddle(MSXEventDistributor& eventDistributor_,
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               StateChangeDistributor& stateChangeDistributor_)
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	: eventDistributor(eventDistributor_)
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	, stateChangeDistributor(stateChangeDistributor_)
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{
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}
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Paddle::~Paddle()
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{
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	if (isPluggedIn()) {
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		Paddle::unplugHelper(EmuTime::dummy());
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	}
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}
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// Pluggable
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zstring_view Paddle::getName() const
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{
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	return "paddle";
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}
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zstring_view Paddle::getDescription() const
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{
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	return "MSX Paddle";
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}
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void Paddle::plugHelper(Connector& /*connector*/, EmuTime /*time*/)
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{
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	eventDistributor.registerEventListener(*this);
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	stateChangeDistributor.registerListener(*this);
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}
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void Paddle::unplugHelper(EmuTime /*time*/)
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{
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	stateChangeDistributor.unregisterListener(*this);
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	eventDistributor.unregisterEventListener(*this);
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}
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// JoystickDevice
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uint8_t Paddle::read(EmuTime time)
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{
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	// The loop in the BIOS routine that reads the paddle status takes
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	// 41 Z80 cycles per iteration.
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	static constexpr auto TICK = EmuDuration::hz(3579545) * 41;
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	assert(time >= lastPulse);
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	bool before = (time - lastPulse) < (TICK * analogValue);
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	bool output = before && !(lastInput & 4);
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	return output ? 0x3F : 0x3E; // pin1 (up)
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}
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void Paddle::write(uint8_t value, EmuTime time)
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{
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	uint8_t diff = lastInput ^ value;
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	lastInput = value;
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	if ((diff & 4) && !(lastInput & 4)) { // high->low edge
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		lastPulse = time;
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	}
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}
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// MSXEventListener
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void Paddle::signalMSXEvent(const Event& event,
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                            EmuTime time) noexcept
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{
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	visit(overloaded{
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		[&](const MouseMotionEvent& e) {
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			constexpr int SCALE = 2;
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			if (int delta = e.getX() / SCALE) {
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				stateChangeDistributor.distributeNew<PaddleState>(
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					time, delta);
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			}
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		},
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		[](const EventBase&) { /*ignore*/ }
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	}, event);
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}
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// StateChangeListener
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void Paddle::signalStateChange(const StateChange& event)
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{
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	const auto* ps = std::get_if<PaddleState>(&event);
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	if (!ps) return;
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	analogValue = narrow_cast<uint8_t>(std::clamp(analogValue + ps->getDelta(), 0, 255));
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}
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void Paddle::stopReplay(EmuTime /*time*/) noexcept
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{
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}
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template<typename Archive>
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void Paddle::serialize(Archive& ar, unsigned /*version*/)
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{
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	ar.serialize("lastPulse",   lastPulse,
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	             "analogValue", analogValue,
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	             "lastInput",   lastInput);
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	if constexpr (Archive::IS_LOADER) {
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		if (isPluggedIn()) {
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			plugHelper(*getConnector(), EmuTime::dummy());
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		}
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	}
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}
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INSTANTIATE_SERIALIZE_METHODS(Paddle);
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REGISTER_POLYMORPHIC_INITIALIZER(Pluggable, Paddle, "Paddle");
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} // namespace openmsx