VDP command engine by Alex Wulms. More...

#include <VDPCmdEngine.hh>

Public Member Functions
	VDPCmdEngine (VDP &vdp, CommandController &commandController)

void	reset (EmuTime::param time)
	Reinitialize Renderer state.

void	sync (EmuTime::param time)
	Synchronizes the command engine with the VDP.

void	sync2 (EmuTime::param time)

void	stealAccessSlot (EmuTime::param time)
	Steal a VRAM access slot from the CmdEngine.

byte	getStatus (EmuTime::param time)
	Gets the command engine status (part of S#2).

byte	readColor (EmuTime::param time)
	Use this method to transfer pixel(s) from VDP to CPU.

void	resetColor ()

unsigned	getBorderX (EmuTime::param time)
	Gets the X coordinate of a border detected by SRCH (intended behaviour, as documented in the V9938 technical data book).

void	setCmdReg (byte index, byte value, EmuTime::param time)
	Writes to a command register.

byte	peekCmdReg (byte index) const
	Read the content of a command register.

void	updateDisplayMode (DisplayMode mode, bool cmdBit, EmuTime::param time)
	Informs the command engine of a VDP display mode change.

template<typename Archive >
void	serialize (Archive &ar, unsigned version)
	Interface for logical operations.

Detailed Description

VDP command engine by Alex Wulms.

Implements command execution unit of V9938/58.

Definition at line 23 of file VDPCmdEngine.hh.

Constructor & Destructor Documentation

◆ VDPCmdEngine()

openmsx::VDPCmdEngine::VDPCmdEngine	(	VDP &	vdp,
		CommandController &	commandController
	)

Definition at line 1771 of file VDPCmdEngine.cc.

Member Function Documentation

◆ getBorderX()

unsigned openmsx::VDPCmdEngine::getBorderX ( EmuTime::param time )

inline

Gets the X coordinate of a border detected by SRCH (intended behaviour, as documented in the V9938 technical data book).

However, real VDP simply returns the current value of the ASX 'temporary source X' counter, regardless of the command that is being executed or was executed most recently

Parameters

time	The moment in emulated time this get occurs.

Definition at line 92 of file VDPCmdEngine.hh.

References sync().

◆ getStatus()

byte openmsx::VDPCmdEngine::getStatus ( EmuTime::param time )

inline

Gets the command engine status (part of S#2).

Bit 7 (TR) is set when the command engine is ready for a pixel transfer. Bit 4 (BD) is set when the boundary color is detected. Bit 0 (CE) is set when a command is in progress.

Definition at line 61 of file VDPCmdEngine.hh.

References sync().

◆ peekCmdReg()

byte openmsx::VDPCmdEngine::peekCmdReg ( byte index ) const

Read the content of a command register.

This method is meant to be used by the debugger, there is no strict guarantee that the returned value is the correct value at exactly this moment in time (IOW this method does not sync the complete CmdEngine)

Parameters

index The register [0..14] to read from.

Definition at line 1873 of file VDPCmdEngine.cc.

References UNREACHABLE.

◆ readColor()

byte openmsx::VDPCmdEngine::readColor ( EmuTime::param time )

inline

Use this method to transfer pixel(s) from VDP to CPU.

This method implements V9938 S#7.

Parameters

time	The moment in emulated time this read occurs.

Returns: Color value of the pixel.

Definition at line 73 of file VDPCmdEngine.hh.

References sync().

◆ reset()

void openmsx::VDPCmdEngine::reset ( EmuTime::param time )

Reinitialize Renderer state.

Parameters

time	The moment in time the reset occurs.

Definition at line 1794 of file VDPCmdEngine.cc.

References openmsx::VDP::getCmdBit(), openmsx::VDP::getDisplayMode(), setCmdReg(), and updateDisplayMode().

◆ resetColor()

void openmsx::VDPCmdEngine::resetColor ( )

inline

Definition at line 77 of file VDPCmdEngine.hh.

◆ serialize()

template<typename Archive >

void openmsx::VDPCmdEngine::serialize	(	Archive &	ar,
		unsigned	version
	)

Interface for logical operations.

Definition at line 2616 of file VDPCmdEngine.cc.

References openmsx::Clock< FREQ_NUM, FREQ_DENOM >::getTime().

◆ setCmdReg()

void openmsx::VDPCmdEngine::setCmdReg	(	byte	index,
		byte	value,
		EmuTime::param	time
	)

Writes to a command register.

Parameters

index	The register [0..14] to write to.
value	The new value for the specified register.
time	The moment in emulated time this write occurs.

Definition at line 1805 of file VDPCmdEngine.cc.

References openmsx::TclCallback::execute(), sync(), and UNREACHABLE.

Referenced by reset().

◆ stealAccessSlot()

void openmsx::VDPCmdEngine::stealAccessSlot ( EmuTime::param time )

inline

Steal a VRAM access slot from the CmdEngine.

Used when the CPU reads/writes VRAM.

Parameters

time	The moment in time the CPU read/write is performed.

Definition at line 47 of file VDPCmdEngine.hh.

References openmsx::VDPAccessSlots::DELTA_1.

Referenced by openmsx::VDPVRAM::cpuRead(), and openmsx::VDPVRAM::cpuWrite().

◆ sync()

void openmsx::VDPCmdEngine::sync ( EmuTime::param time )

inline

Synchronizes the command engine with the VDP.

Ideally this would be a private method, but the current design doesn't allow that.

Parameters

time	The moment in emulated time to sync to.

Definition at line 38 of file VDPCmdEngine.hh.

References sync2().

Referenced by openmsx::VDPVRAM::cpuRead(), openmsx::VDPVRAM::cpuWrite(), getBorderX(), getStatus(), readColor(), setCmdReg(), openmsx::VDPVRAM::sync(), openmsx::VDPVRAM::updateDisplayEnabled(), updateDisplayMode(), and openmsx::VDPVRAM::updateSpritesEnabled().

◆ sync2()

void openmsx::VDPCmdEngine::sync2 ( EmuTime::param time )

Definition at line 2021 of file VDPCmdEngine.cc.

References UNREACHABLE.

Referenced by sync().

◆ updateDisplayMode()

void openmsx::VDPCmdEngine::updateDisplayMode	(	DisplayMode	mode,
		bool	cmdBit,
		EmuTime::param	time
	)

Informs the command engine of a VDP display mode change.

Parameters

mode	The new display mode.
cmdBit	Are VDP commands allowed in non-bitmap mode.
time	The moment in emulated time this change occurs.

Definition at line 1898 of file VDPCmdEngine.cc.

References openmsx::DisplayMode::getBase(), openmsx::DisplayMode::GRAPHIC4, openmsx::DisplayMode::GRAPHIC5, openmsx::DisplayMode::GRAPHIC6, openmsx::DisplayMode::GRAPHIC7, and sync().

Referenced by reset(), and openmsx::VDPVRAM::updateDisplayMode().

The documentation for this class was generated from the following files:

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ VDPCmdEngine()

Member Function Documentation

◆ getBorderX()

◆ getStatus()

◆ peekCmdReg()

◆ readColor()

◆ reset()

◆ resetColor()

◆ serialize()

◆ setCmdReg()

◆ stealAccessSlot()

◆ sync()

◆ sync2()

◆ updateDisplayMode()