The null video driver. More...

#include <null_v.h>

Inheritance diagram for VideoDriver_Null:

Public Member Functions
std::optional< std::string_view >	Start (const StringList &param) override
	Start this driver.

void	Stop () override
	Stop this driver.

void	MakeDirty (int left, int top, int width, int height) override
	Mark a particular area dirty.

void	MainLoop () override
	Perform the actual drawing.

bool	ChangeResolution (int w, int h) override
	Change the resolution of the window.

bool	ToggleFullscreen (bool fullscreen) override
	Change the full screen setting.

std::string_view	GetName () const override
	Get the name of this driver.

bool	HasGUI () const override
	Whether the driver has a graphical user interface with the end user.

Public Member Functions inherited from VideoDriver
	VideoDriver (bool uses_hardware_acceleration=false)

virtual void	ToggleVsync (bool vsync)
	Change the vsync setting.

virtual bool	AfterBlitterChange ()
	Callback invoked after the blitter was changed.

virtual bool	ClaimMousePointer ()

virtual bool	UseSystemCursor ()
	Get whether the mouse cursor is drawn by the video driver.

virtual void	PopulateSystemSprites ()
	Populate all sprites in cache.

virtual void	ClearSystemSprites ()
	Clear all cached sprites.

virtual bool	HasEfficient8Bpp () const
	Has this video driver an efficient code path for palette animated 8-bpp sprites?

virtual bool	HasAnimBuffer ()
	Does this video driver support a separate animation buffer in addition to the colour buffer?

virtual uint8_t *	GetAnimBuffer ()
	Get a pointer to the animation buffer of the video back-end.

virtual void	EditBoxLostFocus ()
	An edit box lost the input focus.

virtual void	EditBoxGainedFocus ()
	An edit box gained the input focus.

virtual std::vector< int >	GetListOfMonitorRefreshRates ()
	Get a list of refresh rates of each available monitor.

virtual int	GetSuggestedUIScale ()
	Get a suggested default GUI scale taking screen DPI into account.

virtual std::string_view	GetInfoString () const

void	QueueOnMainThread (std::function< void()> &&func)
	Queue a function to be called on the main thread with game state lock held and video buffer locked.

void	GameLoopPause ()
	Pause the game-loop for a bit, releasing the game-state lock.

Private Attributes
uint	ticks
	Amount of ticks to run.

Additional Inherited Members
Public Types inherited from Driver
enum	Type { DT_BEGIN = 0 , DT_MUSIC = 0 , DT_SOUND , DT_VIDEO , DT_END }
	The type of driver. More...

Static Public Member Functions inherited from VideoDriver
static VideoDriver *	GetInstance ()
	Get the currently active instance of the video driver.

static std::string	GetCaption ()
	Get the caption to use for the game's title bar.

Protected Member Functions inherited from VideoDriver
virtual Dimension	GetScreenSize () const
	Get the resolution of the main screen.

virtual float	GetDPIScale ()
	Get DPI scaling factor of the screen OTTD is displayed on.

void	UpdateAutoResolution ()
	Apply resolution auto-detection and clamp to sensible defaults.

virtual void	InputLoop ()
	Handle input logic, is CTRL pressed, should we fast-forward, etc.

virtual bool	LockVideoBuffer ()
	Make sure the video buffer is ready for drawing.

virtual void	UnlockVideoBuffer ()
	Unlock a previously locked video buffer.

virtual void	Paint ()
	Paint the window.

virtual void	CheckPaletteAnim ()
	Process any pending palette animation.

virtual bool	PollEvent ()
	Process a single system event.

void	StartGameThread ()
	Start the loop for game-tick.

void	StopGameThread ()
	Stop the loop for the game-tick.

void	Tick ()
	Give the video-driver a tick.

void	SleepTillNextTick ()
	Sleep till the next tick is about to happen.

std::chrono::steady_clock::duration	GetGameInterval ()

std::chrono::steady_clock::duration	GetDrawInterval ()

void	DrainCommandQueue ()
	Execute all queued commands.

Static Protected Member Functions inherited from VideoDriver
static void	GameThreadThunk (VideoDriver *drv)

Protected Attributes inherited from VideoDriver
const uint	ALLOWED_DRIFT = 5
	How many times videodriver can miss deadlines without it being overly compensated.

std::chrono::steady_clock::time_point	next_game_tick

std::chrono::steady_clock::time_point	next_draw_tick

bool	fast_forward_key_pressed
	The fast-forward key is being pressed.

bool	fast_forward_via_key
	The fast-forward was enabled by key press.

bool	is_game_threaded

std::thread	game_thread

std::mutex	game_state_mutex

std::mutex	game_thread_wait_mutex

bool	uses_hardware_acceleration

Detailed Description

The null video driver.

Definition at line 16 of file null_v.h.

Member Function Documentation

◆ ChangeResolution()

bool VideoDriver_Null::ChangeResolution	(	int	w,
		int	h
	)

overridevirtual

Change the resolution of the window.

Parameters

w	The new width.
h	The new height.

Returns: True if the change succeeded.

Implements VideoDriver.

Definition at line 66 of file null_v.cpp.

◆ GetName()

std::string_view VideoDriver_Null::GetName ( ) const

inlineoverridevirtual

Get the name of this driver.

Returns: The name of the driver.

Implements Driver.

Definition at line 32 of file null_v.h.

◆ HasGUI()

bool VideoDriver_Null::HasGUI ( ) const

inlineoverridevirtual

Whether the driver has a graphical user interface with the end user.

Or in other words, whether we should spawn a thread for world generation and NewGRF scanning so the graphical updates can keep coming. Otherwise progress has to be shown on the console, which uses by definition another thread/process for display purposes.

Returns: True for all drivers except null and dedicated.

Reimplemented from VideoDriver.

Definition at line 33 of file null_v.h.

◆ MainLoop()

void VideoDriver_Null::MainLoop ( )

overridevirtual

Perform the actual drawing.

Implements VideoDriver.

Definition at line 49 of file null_v.cpp.

References _settings_client, GUISettings::autosave_on_exit, DoExitSave(), ClientSettings::gui, VideoDriver::InputLoop(), ticks, and UpdateWindows().

◆ MakeDirty()

void VideoDriver_Null::MakeDirty	(	int	left,
		int	top,
		int	width,
		int	height
	)

overridevirtual

Mark a particular area dirty.

Parameters

left	The left most line of the dirty area.
top	The top most line of the dirty area.
width	The width of the dirty area.
height	The height of the dirty area.

Implements VideoDriver.

Definition at line 47 of file null_v.cpp.

◆ Start()

std::optional< std::string_view > VideoDriver_Null::Start ( const StringList & parm )

overridevirtual

Start this driver.

Parameters

parm	Parameters passed to the driver.

Returns: std::nullopt if everything went okay, otherwise an error message.

Implements Driver.

Definition at line 22 of file null_v.cpp.

References _cur_resolution, Debug, GetDriverParamInt(), BlitterFactory::SelectBlitter(), ticks, and VideoDriver::UpdateAutoResolution().

◆ Stop()

void VideoDriver_Null::Stop ( )

overridevirtual

Stop this driver.

Implements Driver.

Definition at line 45 of file null_v.cpp.

◆ ToggleFullscreen()

bool VideoDriver_Null::ToggleFullscreen ( bool fullscreen )

overridevirtual

Change the full screen setting.

Parameters

fullscreen The new setting.

Returns: True if the change succeeded.

Implements VideoDriver.

Definition at line 68 of file null_v.cpp.

Field Documentation

◆ ticks

uint VideoDriver_Null::ticks

private

Amount of ticks to run.

Definition at line 18 of file null_v.h.

Referenced by MainLoop(), and Start().

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

src/video/null_v.h
src/video/null_v.cpp

Public Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ ChangeResolution()

◆ GetName()

◆ HasGUI()

◆ MainLoop()

◆ MakeDirty()

◆ Start()

◆ Stop()

◆ ToggleFullscreen()

Field Documentation

◆ ticks