Unified implementation of MSX Video Display Processors (VDPs). More...

#include <VDP.hh>

Inheritance diagram for openmsx::VDP:

[legend]

Collaboration diagram for openmsx::VDP:

[legend]

Classes
struct	BlinkStateCount
	Calculates what 'blinkState' and 'blinkCount' would be at a specific line. More...

Public Types
using	VDPClock = Clock< TICKS_PER_SECOND >

Public Types inherited from openmsx::MSXDevice
using	Devices = std::vector< MSXDevice * >

Public Member Functions
	VDP (const DeviceConfig &config)

	~VDP () override

void	powerUp (EmuTime::param time) override
	This method is called when MSX is powered up. More...

void	reset (EmuTime::param time) override
	This method is called on reset. More...

byte	readIO (word port, EmuTime::param time) override
	Read a byte from an IO port at a certain time from this device. More...

byte	peekIO (word port, EmuTime::param time) const override
	Read a byte from a given IO port. More...

void	writeIO (word port, byte value, EmuTime::param time) override
	Write a byte to a given IO port at a certain time to this device. More...

void	getExtraDeviceInfo (TclObject &result) const override

PostProcessor *	getPostProcessor () const
	Used by Video9000 to be able to couple the VDP and V9990 output. More...

bool	isMSX1VDP () const
	Is this an MSX1 VDP? More...

bool	isVDPwithPALonly () const
	Is this a VDP only capable of PAL? More...

bool	vdpLacksMirroring () const
	Is this a VDP that lacks mirroring? More...

bool	vdpHasPatColMirroring () const
	Is this a VDP that has pattern/color table mirroring? More...

bool	isVDPwithVRAMremapping () const
	Does this VDP have VRAM remapping when switching from 4k to 8/16k mode? More...

bool	hasYJK () const
	Does this VDP support YJK display? More...

std::array< std::array< uint8_t, 3 >, 16 >	getMSX1Palette () const
	Get the (fixed) palette for this MSX1 VDP. More...

DisplayMode	getDisplayMode () const
	Get the display mode the VDP is in. More...

VDPVRAM &	getVRAM ()
	Get the VRAM object for this VDP. More...

const RawFrame *	isSuperimposing () const
	Are we currently superimposing? In case of superimpose, returns a pointer to the to-be-superimposed frame. More...

SpriteChecker &	getSpriteChecker ()
	Get the sprite checker for this VDP. More...

bool	getTransparency () const
	Gets the current transparency setting. More...

bool	canSpriteColor0Collide () const
	Can a sprite which has color=0 collide with some other sprite? More...

int	getForegroundColor () const
	Gets the current foreground color. More...

byte	getBackgroundColor () const
	Gets the current background color. More...

int	getBlinkForegroundColor () const
	Gets the current blinking color for blinking text. More...

int	getBlinkBackgroundColor () const
	Gets the current blinking color for blinking text. More...

bool	getBlinkState () const
	Gets the current blink state. More...

word	getPalette (unsigned index) const
	Gets a palette entry. More...

bool	isDisplayEnabled () const
	Is the display enabled? Both the regular border and forced blanking by clearing the display enable bit are considered disabled display. More...

bool	spritesEnabled () const
	Are sprites enabled? More...

bool	spritesEnabledFast () const
	Same as spritesEnabled(), but may only be called in sprite mode 1 or 2. More...

bool	spritesEnabledRegister () const
	Still faster variant (just looks at the sprite-enabled-bit). More...

byte	getVerticalScroll () const
	Gets the current vertical scroll (line displayed at Y=0). More...

byte	getHorizontalScrollLow () const
	Gets the current horizontal scroll lower bits. More...

byte	getHorizontalScrollHigh () const
	Gets the current horizontal scroll higher bits. More...

bool	isBorderMasked () const
	Gets the current border mask setting. More...

bool	isMultiPageScrolling () const
	Is multi page scrolling enabled? It is considered enabled if both the multi page scrolling flag is enabled and the current page is odd. More...

int	getLineZero () const
	Get the absolute line number of display line zero. More...

bool	isPalTiming () const
	Is PAL timing active? This setting is fixed at start of frame. More...

bool	isInterlaced () const
	Get interlace status. More...

bool	isFastBlinkEnabled () const
	Get 'fast-blink' status. More...

bool	isEvenOddEnabled () const
	Get even/odd page alternation status. More...

bool	getEvenOdd () const
	Is the even or odd field being displayed? More...

unsigned	getEvenOddMask () const
	Expresses the state of even/odd page interchange in a mask on the line number. More...

unsigned	getEvenOddMask (int line) const
	Similar to the above getEvenOddMask() method, but can also be called when 'isFastBlinkEnabled() == true'. More...

BlinkStateCount	calculateLineBlinkState (unsigned line) const

int	getTicksThisFrame (EmuTime::param time) const
	Gets the number of VDP clock ticks (21MHz) elapsed between a given time and the start of this frame. More...

EmuTime::param	getFrameStartTime () const

int	getSpriteSize () const
	Gets the sprite size in pixels (8/16). More...

bool	isSpriteMag () const
	Are sprites magnified? More...

bool	getCmdBit () const
	Are commands possible in non Graphic modes? (V9958 only) More...

int	getLinesPerFrame () const
	Gets the number of lines per frame. More...

int	getTicksPerFrame () const
	Gets the number of VDP clock ticks (21MHz) per frame. More...

bool	isInsideFrame (EmuTime::param time) const
	Is the given timestamp inside the current frame? Mainly useful for debugging, because relevant timestamps should always be inside the current frame. More...

int	getHorizontalAdjust () const
	This is a combination of the (horizontal) set adjust register and the YJK-mode bit. More...

int	getLeftSprites () const
	Gets the number of VDP clock ticks between start of line and the start of the sprite plane. More...

int	getLeftBorder () const
	Gets the number of VDP clock ticks between start of line and the end of the left border. More...

int	getRightBorder () const
	Gets the number of VDP clock ticks between start of line and the start of the right border. More...

int	getLeftBackground () const
	Gets the number of VDP clock ticks between start of line and the time when the background pixel with X coordinate 0 would be drawn. More...

byte	getStatusReg0 () const
	Should only be used by SpriteChecker. More...

void	setSpriteStatus (byte value)
	Should only be used by SpriteChecker. More...

bool	getVRMode () const
	Returns current VR mode. More...

void	setExternalVideoSource (const RawFrame *externalSource)
	Enable superimposing. More...

bool	getBrokenCmdTiming () const
	Value of the cmdTiming setting, true means commands have infinite speed. More...

EmuTime	getAccessSlot (EmuTime::param time, VDPAccessSlots::Delta delta) const
	Get the earliest access slot that is at least 'delta' cycles in the future. More...

VDPAccessSlots::Calculator	getAccessSlotCalculator (EmuTime::param time, EmuTime::param limit) const
	Same as getAccessSlot(), but it can be much faster for repeated calls, e.g. More...

void	scheduleCmdSync (EmuTime t)
	Only used when there are commandExecuting-probe listeners. More...

template<typename Archive >
void	serialize (Archive &ar, unsigned version)

Public Member Functions inherited from openmsx::MSXDevice
	MSXDevice (const MSXDevice &)=delete

MSXDevice &	operator= (const MSXDevice &)=delete

virtual	~MSXDevice ()=0

const HardwareConfig &	getHardwareConfig () const
	Returns the hardwareconfig this device belongs to. More...

void	testRemove (std::span< const std::unique_ptr< MSXDevice > > removed) const
	Checks whether this device can be removed (no other device has a reference to it). More...

virtual void	reset (EmuTime::param time)
	This method is called on reset. More...

virtual byte	readIRQVector ()
	Gets IRQ vector used in IM2. More...

virtual void	powerDown (EmuTime::param time)
	This method is called when MSX is powered down. More...

virtual void	powerUp (EmuTime::param time)
	This method is called when MSX is powered up. More...

virtual const std::string &	getName () const
	Returns a human-readable name for this device. More...

virtual void	getNameList (TclObject &result) const
	Returns list of name(s) of this device. More...

void	getDeviceInfo (TclObject &result) const
	Get device info. More...

void	getVisibleMemRegion (unsigned &base, unsigned &size) const
	Returns the range where this device is visible in memory. More...

virtual byte	readIO (word port, EmuTime::param time)
	Read a byte from an IO port at a certain time from this device. More...

virtual void	writeIO (word port, byte value, EmuTime::param time)
	Write a byte to a given IO port at a certain time to this device. More...

virtual byte	peekIO (word port, EmuTime::param time) const
	Read a byte from a given IO port. More...

virtual byte	readMem (word address, EmuTime::param time)
	Read a byte from a location at a certain time from this device. More...

virtual void	writeMem (word address, byte value, EmuTime::param time)
	Write a given byte to a given location at a certain time to this device. More...

virtual const byte *	getReadCacheLine (word start) const
	Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for reading. More...

virtual byte *	getWriteCacheLine (word start) const
	Test that the memory in the interval [start, start + CacheLine::SIZE) is cacheable for writing. More...

virtual byte	peekMem (word address, EmuTime::param time) const
	Read a byte from a given memory location. More...

virtual void	globalWrite (word address, byte value, EmuTime::param time)
	Global writes. More...

virtual void	globalRead (word address, EmuTime::param time)
	Global reads. More...

void	invalidateDeviceRWCache ()
	Calls MSXCPUInterface::invalidateXXCache() for the specific (part of) the slot that this device is located in. More...

void	invalidateDeviceRCache ()

void	invalidateDeviceWCache ()

void	invalidateDeviceRWCache (unsigned start, unsigned size)

void	invalidateDeviceRCache (unsigned start, unsigned size)

void	invalidateDeviceWCache (unsigned start, unsigned size)

void	fillDeviceRWCache (unsigned start, unsigned size, byte *rwData)
	Calls MSXCPUInterface::fillXXCache() for the specific (part of) the slot that this device is located in. More...

void	fillDeviceRWCache (unsigned start, unsigned size, const byte rData, byte wData)

void	fillDeviceRCache (unsigned start, unsigned size, const byte *rData)

void	fillDeviceWCache (unsigned start, unsigned size, byte *wData)

MSXMotherBoard &	getMotherBoard () const
	Get the mother board this device belongs to. More...

const XMLElement &	getDeviceConfig () const
	Get the configuration section for this device. More...

const DeviceConfig &	getDeviceConfig2 () const

const Devices &	getReferences () const
	Get the device references that are specified for this device. More...

EmuTime::param	getCurrentTime () const

MSXCPU &	getCPU () const

MSXCPUInterface &	getCPUInterface () const

Scheduler &	getScheduler () const

CliComm &	getCliComm () const

Reactor &	getReactor () const

CommandController &	getCommandController () const

PluggingController &	getPluggingController () const

LedStatus &	getLedStatus () const

template<typename Archive >
void	serialize (Archive &ar, unsigned version)

Static Public Attributes
static constexpr int	TICKS_PER_SECOND = 3579545 * 6
	Number of VDP clock ticks per second. More...

static constexpr int	TICKS_PER_LINE = 1368
	Number of VDP clock ticks per line. More...

Static Public Attributes inherited from openmsx::MSXDevice
static std::array< byte, 0x10000 >	unmappedRead

static std::array< byte, 0x10000 >	unmappedWrite

Additional Inherited Members
Protected Member Functions inherited from openmsx::MSXDevice
	MSXDevice (const DeviceConfig &config, std::string_view name)
	Every MSXDevice has a config entry; this constructor gets some device properties from that config entry. More...

	MSXDevice (const DeviceConfig &config)

virtual void	init ()

virtual unsigned	getBaseSizeAlignment () const
	The 'base' and 'size' attribute values need to be at least aligned to CacheLine::SIZE. More...

virtual bool	allowUnaligned () const
	By default we don't allow unaligned <mem> specifications in the config file. More...

virtual void	getExtraDeviceInfo (TclObject &result) const

byte	getPrimarySlot () const

Protected Attributes inherited from openmsx::MSXDevice
std::string	deviceName

Detailed Description

Unified implementation of MSX Video Display Processors (VDPs).

MSX1 VDP is Texas Instruments TMS9918A or TMS9928A. MSX2 VDP is Yamaha V9938. MSX2+ and turbo R VDP is Yamaha V9958.

Current implementation is written by Maarten ter Huurne, with some contributions from other openMSX developers. The first implementation was based on Sean Young's code from MESS, which was in turn based on code by Mike Balfour. Integration of MESS code into openMSX was done by David Heremans.

All undocumented features as described in the following file should be emulated: http://www.msxnet.org/tech/tms9918a.txt

This class is the VDP core, it uses a separate Renderer to convert the VRAM contents into pixels on the host machine. Communicates with the Renderer through a pull variant of the Observer pattern: a VDP object fires events when its state changes, the Renderer can retrieve the new state if necessary by calling methods on the VDP object.

A note about timing: the start of a frame or line is defined as the starting time of the corresponding sync (vsync, hsync).

Definition at line 62 of file VDP.hh.

Member Typedef Documentation

◆ VDPClock

using openmsx::VDP::VDPClock = Clock<TICKS_PER_SECOND>

Definition at line 69 of file VDP.hh.

Constructor & Destructor Documentation

◆ VDP()

openmsx::VDP::VDP ( const DeviceConfig & config )

explicit

Definition at line 62 of file VDP.cc.

References openmsx::Subject< T >::attach(), openmsx::Display::attach(), openmsx::DeviceConfig::findChild(), openmsx::DeviceConfig::getChildData(), openmsx::DeviceConfig::getChildDataAsInt(), openmsx::MSXDevice::getCommandController(), openmsx::MSXDevice::getCurrentTime(), openmsx::Display::getRenderSettings(), isMSX1VDP(), and powerUp().

◆ ~VDP()

openmsx::VDP::~VDP ( )

override

Definition at line 211 of file VDP.cc.

References openmsx::Subject< T >::detach(), and openmsx::Display::detach().

Member Function Documentation

◆ calculateLineBlinkState()

BlinkStateCount openmsx::VDP::calculateLineBlinkState ( unsigned line ) const

inline

Definition at line 430 of file VDP.hh.

References isFastBlinkEnabled(), and std::swap().

Referenced by getEvenOddMask().

◆ canSpriteColor0Collide()

bool openmsx::VDP::canSpriteColor0Collide ( ) const

inline

Can a sprite which has color=0 collide with some other sprite?

Definition at line 183 of file VDP.hh.

References getTransparency(), and isMSX1VDP().

◆ getAccessSlot()

EmuTime openmsx::VDP::getAccessSlot	(	EmuTime::param	time,
		VDPAccessSlots::Delta	delta
	)		const

Get the earliest access slot that is at least 'delta' cycles in the future.

Definition at line 876 of file VDP.cc.

References openmsx::VDPAccessSlots::getAccessSlot(), and getFrameStartTime().

◆ getAccessSlotCalculator()

VDPAccessSlots::Calculator openmsx::VDP::getAccessSlotCalculator	(	EmuTime::param	time,
		EmuTime::param	limit
	)		const

Same as getAccessSlot(), but it can be much faster for repeated calls, e.g.

in the implementation of VDP commands. However it does have some limitations:

The returned calculator only remains valid for as long as the VDP access timing remains the same (display/sprite enable).
The calculator needs to see all time changes. (So this means that in every VDPCmd::execute() method you need to construct a new calculator).

Definition at line 882 of file VDP.cc.

References openmsx::VDPAccessSlots::getCalculator(), and getFrameStartTime().

◆ getBackgroundColor()

byte openmsx::VDP::getBackgroundColor ( ) const

inline

Gets the current background color.

Returns: Color index. In Graphic5 mode, the range is [0..15]; bits 3-2 contains the color for even pixels, bits 1-0 contains the color for odd pixels. In Graphic7 mode with YJK off, the range is [0..255]. In other modes, the range is [0..15].

Definition at line 207 of file VDP.hh.

References openmsx::DisplayMode::getByte(), and openmsx::DisplayMode::GRAPHIC7.

Referenced by openmsx::PixelRenderer::updatePalette().

◆ getBlinkBackgroundColor()

int openmsx::VDP::getBlinkBackgroundColor ( ) const

inline

Gets the current blinking color for blinking text.

Returns: Color index [0..15].

Definition at line 226 of file VDP.hh.

◆ getBlinkForegroundColor()

int openmsx::VDP::getBlinkForegroundColor ( ) const

inline

Gets the current blinking color for blinking text.

Returns: Color index [0..15].

Definition at line 219 of file VDP.hh.

◆ getBlinkState()

bool openmsx::VDP::getBlinkState ( ) const

inline

Gets the current blink state.

Returns: True iff alternate colors / page should be displayed.

Definition at line 233 of file VDP.hh.

◆ getBrokenCmdTiming()

bool openmsx::VDP::getBrokenCmdTiming ( ) const

inline

Value of the cmdTiming setting, true means commands have infinite speed.

Definition at line 601 of file VDP.hh.

◆ getCmdBit()

bool openmsx::VDP::getCmdBit ( ) const

inline

Are commands possible in non Graphic modes? (V9958 only)

Returns: True iff CMD bit set.

Definition at line 492 of file VDP.hh.

Referenced by openmsx::VDPCmdEngine::reset().

◆ getDisplayMode()

DisplayMode openmsx::VDP::getDisplayMode ( ) const

inline

Get the display mode the VDP is in.

Returns: The current display mode.

Definition at line 144 of file VDP.hh.

Referenced by openmsx::VDPCmdEngine::reset(), openmsx::SpriteChecker::serialize(), openmsx::PixelRenderer::updateDisplayMode(), and openmsx::PixelRenderer::updatePalette().

◆ getEvenOdd()

bool openmsx::VDP::getEvenOdd ( ) const

inline

Is the even or odd field being displayed?

Returns: True iff this field should be displayed half a line lower.

Definition at line 384 of file VDP.hh.

Referenced by openmsx::PixelRenderer::frameStart().

◆ getEvenOddMask() [1/2]

unsigned openmsx::VDP::getEvenOddMask ( ) const

inline

Expresses the state of even/odd page interchange in a mask on the line number.

If even/odd interchange is active, for some frames lines 256..511 (page 1) are replaced by 0..255 (page 0) and 768..1023 (page 3, if applicable) by 512..767 (page 2). Together with the interlace setting this can be used to create an interlaced display. Even/odd interchange can also happen because of the 'blink' feature in bitmap modes.

Precondition: !isFastBlinkEnabled()

Returns: Line number mask that expressed even/odd state.

Definition at line 399 of file VDP.hh.

References isFastBlinkEnabled().

Referenced by getEvenOddMask().

◆ getEvenOddMask() [2/2]

unsigned openmsx::VDP::getEvenOddMask ( int line ) const

inline

Similar to the above getEvenOddMask() method, but can also be called when 'isFastBlinkEnabled() == true'.

In the latter case the timing is based on lines instead of frames. This means the result is no longer fixed per frame, and thus this method takes an additional line parameter.

Definition at line 412 of file VDP.hh.

References calculateLineBlinkState(), getEvenOddMask(), and isFastBlinkEnabled().

◆ getExtraDeviceInfo()

void openmsx::VDP::getExtraDeviceInfo ( TclObject & result ) const

overridevirtual

See also: getDeviceInfo() Default implementation does nothing. Subclasses can override this method to add extra info (like subtypes).

Reimplemented from openmsx::MSXDevice.

Definition at line 737 of file VDP.cc.

References openmsx::TclObject::addDictKeyValues(), openmsx::XMLElement::findChild(), and openmsx::MSXDevice::getDeviceConfig().

◆ getForegroundColor()

int openmsx::VDP::getForegroundColor ( ) const

inline

Gets the current foreground color.

Returns: Color index [0..15].

Definition at line 195 of file VDP.hh.

◆ getFrameStartTime()

EmuTime::param openmsx::VDP::getFrameStartTime ( ) const

inline

Definition at line 473 of file VDP.hh.

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

Referenced by getAccessSlot(), getAccessSlotCalculator(), and openmsx::SpriteChecker::serialize().

◆ getHorizontalAdjust()

int openmsx::VDP::getHorizontalAdjust ( ) const

inline

This is a combination of the (horizontal) set adjust register and the YJK-mode bit.

Definition at line 525 of file VDP.hh.

◆ getHorizontalScrollHigh()

byte openmsx::VDP::getHorizontalScrollHigh ( ) const

inline

Gets the current horizontal scroll higher bits.

This value determines how many 8-pixel steps the background is rotated to the left.

Returns: Horizontal scroll high register value.

Definition at line 301 of file VDP.hh.

◆ getHorizontalScrollLow()

byte openmsx::VDP::getHorizontalScrollLow ( ) const

inline

Gets the current horizontal scroll lower bits.

Rather than actually scrolling the screen, this setting shifts the screen 0..7 bytes to the right.

Returns: Horizontal scroll low register value.

Definition at line 292 of file VDP.hh.

Referenced by getLeftBackground().

◆ getLeftBackground()

int openmsx::VDP::getLeftBackground ( ) const

inline

Gets the number of VDP clock ticks between start of line and the time when the background pixel with X coordinate 0 would be drawn.

This includes extra pixels of horizontal scroll low, but disregards border mask.

Definition at line 564 of file VDP.hh.

References getHorizontalScrollLow(), and getLeftSprites().

◆ getLeftBorder()

int openmsx::VDP::getLeftBorder ( ) const

inline

Gets the number of VDP clock ticks between start of line and the end of the left border.

Does not include extra pixels of horizontal scroll low, since those are not actually border pixels (sprites appear in front of them).

Definition at line 547 of file VDP.hh.

References getLeftSprites(), and isBorderMasked().

◆ getLeftSprites()

int openmsx::VDP::getLeftSprites ( ) const

inline

Gets the number of VDP clock ticks between start of line and the start of the sprite plane.

The location of the sprite plane is not influenced by horizontal scroll or border mask. TODO: Leave out the text mode case, since there are no sprites in text mode?

Definition at line 536 of file VDP.hh.

References openmsx::DisplayMode::isTextMode().

Referenced by getLeftBackground(), getLeftBorder(), and getRightBorder().

◆ getLinesPerFrame()

int openmsx::VDP::getLinesPerFrame ( ) const

inline

Gets the number of lines per frame.

Definition at line 498 of file VDP.hh.

Referenced by getTicksPerFrame().

◆ getLineZero()

int openmsx::VDP::getLineZero ( ) const

inline

Get the absolute line number of display line zero.

Usually this is equal to the height of the top border, but not so during overscan.

Definition at line 328 of file VDP.hh.

References TICKS_PER_LINE.

◆ getMSX1Palette()

std::array< std::array< uint8_t, 3 >, 16 > openmsx::VDP::getMSX1Palette ( ) const

Get the (fixed) palette for this MSX1 VDP.

Don't use this if it's not an MSX1 VDP!

Returns: an array of 16 RGB triplets

Definition at line 1533 of file VDP.cc.

References openmsx::B, Math::clipIntToByte(), openmsx::MSXDevice::getDeviceConfig(), isMSX1VDP(), and xrange().

◆ getPalette()

word openmsx::VDP::getPalette ( unsigned index ) const

inline

Gets a palette entry.

Parameters

index The index [0..15] in the palette.

Returns: Color value in the format of the palette registers: bit 10..8 is green, bit 6..4 is red and bit 2..0 is blue.

Definition at line 242 of file VDP.hh.

◆ getPostProcessor()

PostProcessor * openmsx::VDP::getPostProcessor ( ) const

Used by Video9000 to be able to couple the VDP and V9990 output.

Can return nullptr in case of renderer=none. This value can change over the lifetime of the VDP object (on renderer switch).

Definition at line 237 of file VDP.cc.

◆ getRightBorder()

int openmsx::VDP::getRightBorder ( ) const

inline

Gets the number of VDP clock ticks between start of line and the start of the right border.

Definition at line 554 of file VDP.hh.

References getLeftSprites(), and openmsx::DisplayMode::isTextMode().

◆ getSpriteChecker()

SpriteChecker & openmsx::VDP::getSpriteChecker ( )

inline

Get the sprite checker for this VDP.

Definition at line 170 of file VDP.hh.

◆ getSpriteSize()

int openmsx::VDP::getSpriteSize ( ) const

inline

Gets the sprite size in pixels (8/16).

Definition at line 479 of file VDP.hh.

◆ getStatusReg0()

byte openmsx::VDP::getStatusReg0 ( ) const

inline

Should only be used by SpriteChecker.

Returns the current value of status register 0 (both the F-flag and the sprite related bits).

Definition at line 571 of file VDP.hh.

Referenced by openmsx::SpriteChecker::resetStatus().

◆ getTicksPerFrame()

int openmsx::VDP::getTicksPerFrame ( ) const

inline

Gets the number of VDP clock ticks (21MHz) per frame.

Definition at line 504 of file VDP.hh.

References getLinesPerFrame(), and TICKS_PER_LINE.

Referenced by isInsideFrame().

◆ getTicksThisFrame()

int openmsx::VDP::getTicksThisFrame ( EmuTime::param time ) const

inline

Gets the number of VDP clock ticks (21MHz) elapsed between a given time and the start of this frame.

Definition at line 469 of file VDP.hh.

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

Referenced by isInsideFrame().

◆ getTransparency()

bool openmsx::VDP::getTransparency ( ) const

inline

Gets the current transparency setting.

Returns: True iff color 0 is transparent.

Definition at line 177 of file VDP.hh.

Referenced by canSpriteColor0Collide().

◆ getVerticalScroll()

byte openmsx::VDP::getVerticalScroll ( ) const

inline

Gets the current vertical scroll (line displayed at Y=0).

Returns: Vertical scroll register value.

Definition at line 283 of file VDP.hh.

◆ getVRAM()

VDPVRAM & openmsx::VDP::getVRAM ( )

inline

Get the VRAM object for this VDP.

Definition at line 150 of file VDP.hh.

◆ getVRMode()

bool openmsx::VDP::getVRMode ( ) const

inline

Returns current VR mode.

false -> VR=0, true -> VR=1

Definition at line 589 of file VDP.hh.

Referenced by openmsx::VDPVRAM::serialize().

◆ hasYJK()

bool openmsx::VDP::hasYJK ( ) const

inline

Does this VDP support YJK display?

Returns: True for V9958, false otherwise.

Definition at line 131 of file VDP.hh.

◆ isBorderMasked()

bool openmsx::VDP::isBorderMasked ( ) const

inline

Gets the current border mask setting.

Border mask extends the left border by 8 pixels if enabled. This is a V9958 feature, on older VDPs it always returns false.

Returns: true iff enabled.

Definition at line 310 of file VDP.hh.

Referenced by getLeftBorder().

◆ isDisplayEnabled()

bool openmsx::VDP::isDisplayEnabled ( ) const

inline

Is the display enabled? Both the regular border and forced blanking by clearing the display enable bit are considered disabled display.

Returns: true iff enabled.

Definition at line 251 of file VDP.hh.

Referenced by openmsx::PixelRenderer::reInit().

◆ isEvenOddEnabled()

bool openmsx::VDP::isEvenOddEnabled ( ) const

inline

Get even/odd page alternation status.

Interlace means the odd fields are displayed half a line lower than the even fields. Together with even/odd page alternation this can be used to create an interlaced display. This setting is NOT fixed at start of frame. TODO: Find out how real VDP does it. If it fixes it at start of frame, so should we. If it handles it dynamically (my guess), then an update method should be added on the Renderer interface.

Returns: True iff even/odd page alternation is enabled.

Definition at line 376 of file VDP.hh.

References isFastBlinkEnabled().

Referenced by openmsx::PixelRenderer::frameEnd(), and openmsx::PixelRenderer::frameStart().

◆ isFastBlinkEnabled()

bool openmsx::VDP::isFastBlinkEnabled ( ) const

inline

Get 'fast-blink' status.

Normally blinking timing (alternating between pages) is based on frames. Though the V99x8 has an undocumented feature which changes this timing to lines. Sometimes this is called the "Cadari" feature after Luciano Cadari who discovered it.

See ticket#1091: "Support for undocumented V99x8 register 1 bit 2" https://github.com/openMSX/openMSX/issues/1091 for test cases and links to more information.

Definition at line 361 of file VDP.hh.

Referenced by calculateLineBlinkState(), getEvenOddMask(), and isEvenOddEnabled().

◆ isInsideFrame()

bool openmsx::VDP::isInsideFrame ( EmuTime::param time ) const

inline

Is the given timestamp inside the current frame? Mainly useful for debugging, because relevant timestamps should always be inside the current frame.

The end time of a frame is still considered inside, to support the case when the given timestamp is exclusive itself: a typically "limit" variable.

Parameters

time	Timestamp to check.

Returns: True iff the timestamp is inside the current frame.

Definition at line 517 of file VDP.hh.

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

Referenced by openmsx::VDPVRAM::cmdWrite(), openmsx::VDPVRAM::cpuRead(), openmsx::VDPVRAM::cpuWrite(), readIO(), openmsx::VDPVRAM::sync(), openmsx::VDPVRAM::updateDisplayEnabled(), openmsx::VDPVRAM::updateDisplayMode(), openmsx::VDPVRAM::updateSpritesEnabled(), and writeIO().

◆ isInterlaced()

bool openmsx::VDP::isInterlaced ( ) const

inline

Get interlace status.

Interlace means the odd fields are displayed half a line lower than the even fields. Together with even/odd page alternation this can be used to create an interlaced display. This setting is fixed at start of frame.

Returns: True iff interlace is enabled.

Definition at line 347 of file VDP.hh.

Referenced by openmsx::PixelRenderer::frameEnd(), and openmsx::PixelRenderer::frameStart().

◆ isMSX1VDP()

bool openmsx::VDP::isMSX1VDP ( ) const

inline

Is this an MSX1 VDP?

Returns: True if this is an MSX1 VDP False otherwise.

Definition at line 96 of file VDP.hh.

Referenced by canSpriteColor0Collide(), getMSX1Palette(), readIO(), openmsx::SDLRasterizer< Pixel >::SDLRasterizer(), spritesEnabled(), spritesEnabledFast(), VDP(), and writeIO().

◆ isMultiPageScrolling()

bool openmsx::VDP::isMultiPageScrolling ( ) const

inline

Is multi page scrolling enabled? It is considered enabled if both the multi page scrolling flag is enabled and the current page is odd.

Scrolling wraps into the lower even page.

Returns: true iff enabled.

Definition at line 320 of file VDP.hh.

◆ isPalTiming()

bool openmsx::VDP::isPalTiming ( ) const

inline

Is PAL timing active? This setting is fixed at start of frame.

Returns: True if PAL timing, false if NTSC timing.

Definition at line 336 of file VDP.hh.

◆ isSpriteMag()

bool openmsx::VDP::isSpriteMag ( ) const

inline

Are sprites magnified?

Definition at line 485 of file VDP.hh.

◆ isSuperimposing()

const RawFrame * openmsx::VDP::isSuperimposing ( ) const

inline

Are we currently superimposing? In case of superimpose, returns a pointer to the to-be-superimposed frame.

Returns nullptr if superimpose is not active.

Definition at line 158 of file VDP.hh.

◆ isVDPwithPALonly()

bool openmsx::VDP::isVDPwithPALonly ( ) const

inline

Is this a VDP only capable of PAL?

Returns: True iff this is a PAL only VDP

Definition at line 103 of file VDP.hh.

◆ isVDPwithVRAMremapping()

bool openmsx::VDP::isVDPwithVRAMremapping ( ) const

inline

Does this VDP have VRAM remapping when switching from 4k to 8/16k mode?

Returns: True iff this is a VDP with VRAM remapping

Definition at line 124 of file VDP.hh.

◆ peekIO()

byte openmsx::VDP::peekIO	(	word	port,
		EmuTime::param	time
	)		const

overridevirtual

Read a byte from a given IO port.

Reading via this method has no side effects (doesn't change the device status). If safe reading is not possible this method returns 0xFF. This method is not used by the emulation. It can however be used by a debugger. The default implementation just returns 0xFF.

Reimplemented from openmsx::MSXDevice.

Definition at line 991 of file VDP.cc.

Referenced by openmsx::MSXMatsushita::peekIO().

◆ powerUp()

void openmsx::VDP::powerUp ( EmuTime::param time )

overridevirtual

This method is called when MSX is powered up.

The default implementation calls reset(), this is usually ok.

Parameters

time	The moment in time the power up occurs.

Reimplemented from openmsx::MSXDevice.

Definition at line 309 of file VDP.cc.

References reset().

Referenced by VDP().

◆ readIO()

byte openmsx::VDP::readIO	(	word	port,
		EmuTime::param	time
	)

overridevirtual

Read a byte from an IO port at a certain time from this device.

The default implementation returns 255.

Reimplemented from openmsx::MSXDevice.

Definition at line 971 of file VDP.cc.

References isInsideFrame(), isMSX1VDP(), and UNREACHABLE.

Referenced by openmsx::MSXMatsushita::readIO().

◆ reset()

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

overridevirtual

This method is called on reset.

Default implementation does nothing.

Reimplemented from openmsx::MSXDevice.

Definition at line 315 of file VDP.cc.

Referenced by powerUp().

◆ scheduleCmdSync()

void openmsx::VDP::scheduleCmdSync ( EmuTime t )

inline

Only used when there are commandExecuting-probe listeners.

Call to announce a (lower-bound) estimate for when the VDP command will finish executing. In response the VDP will schedule a synchronization point to sync with VDPCmdEngine emulation.

Normally it's not required to pro-actively sync with the end of a VDP command. Instead these sync happen reactively on VDP status reads (e.g. polling the CE bit) or on VRAM reads (rendering or CPU VRAM read). This is in contrast with the V9990 where we DO need an active sync because the V9990 can generate an IRQ on command end.

Though when the VDP.commandExecuting probe is in use we do want a reasonably timing accurate reaction of that probe. So (only) then we do add the extra syncs (thus with extra emulation overhead when you use that probe).

Definition at line 638 of file VDP.hh.

References openmsx::Clock< TICKS_PER_SECOND >::duration(), openmsx::MSXDevice::getCurrentTime(), and t.

◆ serialize()

template<typename Archive >

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

Definition at line 1903 of file VDP.cc.

References openmsx::DisplayMode::getByte(), openmsx::Schedulable::restoreOld(), and openmsx::DisplayMode::setByte().

◆ setExternalVideoSource()

void openmsx::VDP::setExternalVideoSource ( const RawFrame * externalSource )

inline

Enable superimposing.

Definition at line 595 of file VDP.hh.

◆ setSpriteStatus()

void openmsx::VDP::setSpriteStatus ( byte value )

inline

Should only be used by SpriteChecker.

Change the sprite related bits of status register 0 (leaves the F-flag unchanged). Bit 6 (5S) is set when more than 4 (sprite mode 1) or 8 (sprite mode 2) sprites occur on the same line. Bit 5 (C) is set when sprites collide. Bit 4..0 (5th sprite number) contains the number of the first sprite to exceed the limit per line.

Definition at line 581 of file VDP.hh.

Referenced by openmsx::SpriteChecker::reset(), and openmsx::SpriteChecker::resetStatus().

◆ spritesEnabled()

bool openmsx::VDP::spritesEnabled ( ) const

inline

Are sprites enabled?

Returns: True iff blanking is off, the current mode supports sprites and sprites are not disabled.

Definition at line 259 of file VDP.hh.

References openmsx::DisplayMode::getSpriteMode(), and isMSX1VDP().

◆ spritesEnabledFast()

bool openmsx::VDP::spritesEnabledFast ( ) const

inline

Same as spritesEnabled(), but may only be called in sprite mode 1 or 2.

Is a tiny bit faster.

Definition at line 268 of file VDP.hh.

References openmsx::DisplayMode::getSpriteMode(), and isMSX1VDP().

◆ spritesEnabledRegister()

bool openmsx::VDP::spritesEnabledRegister ( ) const

inline

Still faster variant (just looks at the sprite-enabled-bit).

But only valid in sprite mode 1/2 with screen enabled.

Definition at line 276 of file VDP.hh.

◆ vdpHasPatColMirroring()

bool openmsx::VDP::vdpHasPatColMirroring ( ) const

inline

Is this a VDP that has pattern/color table mirroring?

Returns: True iff this VDP has pattern/color table mirroring

Definition at line 117 of file VDP.hh.

◆ vdpLacksMirroring()

bool openmsx::VDP::vdpLacksMirroring ( ) const

inline

Is this a VDP that lacks mirroring?

Returns: True iff this VDP lacks the screen 2 mirrored mode

Definition at line 110 of file VDP.hh.

◆ writeIO()

void openmsx::VDP::writeIO	(	word	port,
		byte	value,
		EmuTime::param	time
	)

overridevirtual

Write a byte to a given IO port at a certain time to this device.

The default implementation ignores the write (does nothing)

Reimplemented from openmsx::MSXDevice.

Definition at line 647 of file VDP.cc.

References isInsideFrame(), isMSX1VDP(), and openmsx::MSXCPU::waitCyclesZ80().

Referenced by openmsx::MSXMatsushita::writeIO().

Member Data Documentation

◆ TICKS_PER_LINE

constexpr int openmsx::VDP::TICKS_PER_LINE = 1368

staticconstexpr

Number of VDP clock ticks per line.

Definition at line 73 of file VDP.hh.

Referenced by openmsx::SpriteChecker::checkUntil(), openmsx::SDLRasterizer< Pixel >::drawBorder(), getLineZero(), getTicksPerFrame(), and openmsx::SpriteChecker::updateDisplayMode().

◆ TICKS_PER_SECOND

constexpr int openmsx::VDP::TICKS_PER_SECOND = 3579545 * 6

staticconstexpr

Number of VDP clock ticks per second.

Definition at line 68 of file VDP.hh.

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

Classes

Public Types

Public Member Functions

Static Public Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ VDPClock

Constructor & Destructor Documentation

◆ VDP()

◆ ~VDP()

Member Function Documentation

◆ calculateLineBlinkState()

◆ canSpriteColor0Collide()

◆ getAccessSlot()

◆ getAccessSlotCalculator()

◆ getBackgroundColor()

◆ getBlinkBackgroundColor()

◆ getBlinkForegroundColor()

◆ getBlinkState()

◆ getBrokenCmdTiming()

◆ getCmdBit()

◆ getDisplayMode()

◆ getEvenOdd()

◆ getEvenOddMask() [1/2]

◆ getEvenOddMask() [2/2]

◆ getExtraDeviceInfo()

◆ getForegroundColor()

◆ getFrameStartTime()

◆ getHorizontalAdjust()

◆ getHorizontalScrollHigh()

◆ getHorizontalScrollLow()

◆ getLeftBackground()

◆ getLeftBorder()

◆ getLeftSprites()

◆ getLinesPerFrame()

◆ getLineZero()

◆ getMSX1Palette()

◆ getPalette()

◆ getPostProcessor()

◆ getRightBorder()

◆ getSpriteChecker()

◆ getSpriteSize()

◆ getStatusReg0()

◆ getTicksPerFrame()

◆ getTicksThisFrame()

◆ getTransparency()

◆ getVerticalScroll()

◆ getVRAM()

◆ getVRMode()

◆ hasYJK()

◆ isBorderMasked()

◆ isDisplayEnabled()

◆ isEvenOddEnabled()

◆ isFastBlinkEnabled()

◆ isInsideFrame()

◆ isInterlaced()

◆ isMSX1VDP()

◆ isMultiPageScrolling()

◆ isPalTiming()

◆ isSpriteMag()

◆ isSuperimposing()

◆ isVDPwithPALonly()

◆ isVDPwithVRAMremapping()

◆ peekIO()

◆ powerUp()

◆ readIO()

◆ reset()

◆ scheduleCmdSync()

◆ serialize()

◆ setExternalVideoSource()

◆ setSpriteStatus()

◆ spritesEnabled()

◆ spritesEnabledFast()

◆ spritesEnabledRegister()

◆ vdpHasPatColMirroring()

◆ vdpLacksMirroring()

◆ writeIO()

Member Data Documentation

◆ TICKS_PER_LINE