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◆ main openmsx / src / input / ColecoJoystickIO.cc
2.8 KiB · C++ · last changed chore(): initial commit 1 month ago source blame history raw
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#include "ColecoJoystickIO.hh"
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#include "JoystickPort.hh"
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#include "MSXMotherBoard.hh"
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#include "Reactor.hh"
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#include "serialize.hh"
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#include "Math.hh"
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#include "enumerate.hh"
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#include <array>
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namespace openmsx {
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ColecoJoystickIO::ColecoJoystickIO(const DeviceConfig& config)
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	: MSXDevice(config)
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	, keyboard(
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		config.getMotherBoard(),
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		config.getMotherBoard().getScheduler(),
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		config.getMotherBoard().getCommandController(),
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		config.getMotherBoard().getReactor().getEventDistributor(),
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		config.getMotherBoard().getMSXEventDistributor(),
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		config.getMotherBoard().getStateChangeDistributor(),
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		Keyboard::Matrix::CVJOY,
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		config)
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{
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	MSXMotherBoard& motherBoard = getMotherBoard();
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	auto time = getCurrentTime();
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	for (auto [i, port] : enumerate(ports)) {
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		port = &motherBoard.getJoystickPort(unsigned(i));
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		// Clear strobe bit, or MSX joysticks will stay silent.
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		port->write(0xFB, time);
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	}
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	reset(time);
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}
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void ColecoJoystickIO::reset(EmuTime /*time*/)
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{
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	joyMode = 0;
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}
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byte ColecoJoystickIO::peekIO(uint16_t port, EmuTime time) const
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{
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	const int joyPort = (port >> 1) & 1;
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	const byte joyStatus = ports[joyPort]->read(time);
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	auto keys = keyboard.getKeys();
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	if (joyMode == 0) {
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		// Combine keypad rows, convert to high-active and drop unused bits.
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		// Note: The keypad can only return one button press, but I don't know
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		//       what happens if you press two buttons at once.
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		unsigned keypadStatus = ~(
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			keys[joyPort * 2 + 2] | (keys[joyPort * 2 + 3] << 8)
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			) & 0xFFF;
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		static constexpr std::array<byte, 13> keyEnc = {
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			0xF, 0xA, 0xD, 0x7, 0xC, 0x2, 0x3, 0xE, 0x5, 0x1, 0xB, 0x9, 0x6
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		};
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		return keyEnc[Math::findFirstSet(keypadStatus)]
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		     | 0x30 // not connected
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		     | ((joyStatus << 1) & (keys[joyPort] >> 1) & 0x40); // trigger B
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	} else {
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		// Map MSX joystick direction bits to Coleco bits.
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		byte value =
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			  ( joyStatus       & 0x01) // up
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			| ((joyStatus >> 2) & 0x02) // right
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			| ((joyStatus << 1) & 0x04) // down
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			| ((joyStatus << 1) & 0x08) // left
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			| 0x30 // not connected
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			| ((joyStatus << 2) & 0x40) // trigger A
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			;
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			// Note: ColEm puts 0 in bit 7.
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			//       I don't know why this is different from bit 4 and 5.
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		// Combine with row 0/1 of keyboard matrix.
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		return value & (keys[joyPort] | ~0x4F);
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	}
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}
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byte ColecoJoystickIO::readIO(uint16_t port, EmuTime time)
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{
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	return peekIO(port, time);
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}
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void ColecoJoystickIO::writeIO(uint16_t port, byte /*value*/, EmuTime /*time*/)
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{
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	joyMode = (port >> 6) & 1;
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}
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template<typename Archive>
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void ColecoJoystickIO::serialize(Archive& ar, unsigned version)
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{
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	ar.template serializeBase<MSXDevice>(*this);
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	ar.serialize("joyMode", joyMode);
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	if (ar.versionAtLeast(version, 2)) {
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		ar.serialize("keyboard", keyboard);
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	}
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}
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INSTANTIATE_SERIALIZE_METHODS(ColecoJoystickIO);
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REGISTER_MSXDEVICE(ColecoJoystickIO, "ColecoJoystick");
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} // namespace openmsx