Singleton class that holds a collection of utility functions and member variables to communicate with the OpenXR runtime. More...

#include <vtkOpenXRManager.h>

Collaboration diagram for vtkOpenXRManager:

[legend]

Classes
struct	Action_t

struct	RenderResources_t
	This struct stores all needed information to render the images and send it to the user We can't make a vector of struct because OpenXR SDK needs an array of XrXXX for xrEnumerate functions. More...

struct	Swapchain_t
	Swapchain structure storing information common to all rendering backend. More...

Public Types
enum	OutputLevel { DebugOutput = 0 , WarningOutput = 1 , ErrorOutput = 2 }

enum	ControllerIndex { Inactive = -1 , Left = 0 , Right = 1 , Head = 2 , Generic = 3 , NumberOfControllers = 4 }

Public Member Functions
uint32_t	GetViewCount ()
	Return the number of OpenXR views (typically one per physical display / eye)

const std::array< XrPath, 2 > &	GetSubactionPaths ()

void	DestroyActionSets ()
	Iterate over and destroy all action sets that have been created.

bool	ApplyVibration (const Action_t &actionT, int hand, float amplitude=0.5f, float duration=25000000.0f, float frequency=XR_FREQUENCY_UNSPECIFIED)
	Apply haptic vibration `action` to emit vibration on `hand` to emit on `amplitude` 0.0 to 1.0.


bool	XrCheckOutput (OutputLevel level, const XrResult &, const std::string &message)
	Utility function to check the XrResult, print the result message as a debug, warning or error message if the result failed.


void	PrintInstanceProperties ()
	Utility functions to print information about OpenXR manager internal structures.

void	PrintSystemProperties (XrSystemProperties *system_properties)
	Utility functions to print information about OpenXR manager internal structures.

void	PrintSupportedViewConfigs ()
	Utility functions to print information about OpenXR manager internal structures.

void	PrintViewConfigViewInfo (const std::vector< XrViewConfigurationView > &)
	Utility functions to print information about OpenXR manager internal structures.

bool	PrintReferenceSpaces ()
	Utility functions to print information about OpenXR manager internal structures.


bool	Initialize (vtkOpenGLRenderWindow *)
	Initialize the OpenXR SDK to render images in a virtual reality device.


void	Finalize ()
	End the OpenXR session and destroy it and the OpenXR instance.


std::tuple< uint32_t, uint32_t >	GetRecommendedImageRectSize ()
	Return as a tuple the OpenXR recommended texture size to be sent to the device.


uint32_t	GetRecommendedSampleCount ()
	Return the recommended swapchain sample count.


std::string	GetOpenXRPropertiesAsString ()
	Return the OpenXR properties as a string, with format "RuntimeName MAJOR.MINOR.PATCH".


const XrPosef *	GetViewPose (uint32_t eye)
	Returns a pointer to the view pose that contains the view orientation and position for the specified eye, or nullptr if eye exceeds or equals the number of configured views.


const XrFovf *	GetProjectionFov (uint32_t eye)
	Returns a pointer to the projection field of view for the specified eye, or nullptr if eye exceeds or equals the number of configured views.


bool	IsDepthExtensionSupported ()
	Return true if the runtime supports the depth extension.


bool	GetShouldRenderCurrentFrame ()
	Return true if the current frame should be rendered.


bool	BeginSession ()
	Start the OpenXR session.


const XrSession &	GetSession ()
	Return the OpenXR Session.


const XrInstance &	GetXrRuntimeInstance ()
	Return the instance used to communicate with the runtime.


bool	IsSessionRunning ()
	Return true if the OpenXR session is currently running, ie.


bool	WaitAndBeginFrame ()
	This function is used to start a frame.


bool	PrepareRendering (uint32_t eye, void colorTextureId, void depthTextureId)
	Prepare the rendering resources for the specified eye and store in `colorTextureId` and in `depthTextureId` (if the depth extension is supported) the texture in which we need to draw pixels.


void	ReleaseSwapchainImage (uint32_t eye)
	When the rendering in a swapchain image is done, it must be released with this function.


bool	EndFrame ()
	Submit the composition layers for the predicted display time of the current frame.


bool	PollEvent (XrEventDataBuffer &eventData)
	Store in eventData the result of xrPollEvent.


XrPath	GetXrPath (const std::string &path)
	Get the XrPath from the well-formed string `path`.


bool	CreateActionSet (const std::string &actionSetName, const std::string &localizedActionSetName)
	Creates an action set and add it to the vector of action sets.


bool	SelectActiveActionSet (unsigned int index)
	Selects the current active action set from the ActionSets vector using its index.


bool	AttachSessionActionSets ()
	Attach all action sets in the ActionSets vector to the session.


bool	CreateOneAction (Action_t &actionT, const std::string &name, const std::string &localizedName)
	Creates one action with name `name` and localizedName `localizedName` and store the action handle inside `actionT` using the selected active action set.


bool	SuggestActions (const std::string &profile, std::vector< XrActionSuggestedBinding > &actionSuggestedBindings)
	Suggest actions stored in `actionSuggestedBindings` for the interaction profile `profile`.


bool	SyncActions ()
	Update the action states using the active action set.


bool	UpdateActionData (Action_t &action_t, int hand)
	Update the action data and store it in action_t.States for one hand.


void	SetGraphicsStrategy (vtkOpenXRManagerGraphics *gs)
	Set/Get the rendering backend strategy.

vtkOpenXRManagerGraphics *	GetGraphicsStrategy ()
	Set/Get the rendering backend strategy.


void	SetConnectionStrategy (vtkOpenXRManagerConnection *cs)
	Set/Get the connection strategy.

vtkOpenXRManagerConnection *	GetConnectionStrategy ()
	Set/Get the connection strategy.

Static Public Member Functions

static vtkOpenXRManager &	GetInstance ()
	Return the singleton instance.

Protected Member Functions
	vtkOpenXRManager ()

	~vtkOpenXRManager ()=default

bool	LoadControllerModels ()


bool	CreateInstance ()
	OpenXR Instance creation.

std::vector< const char * >	SelectExtensions ()
	OpenXR Instance creation.


void	PrintOptionalExtensions ()
	Print the optional extensions which were found and enabled.


bool	CreateSystem ()
	OpenXR System creation.


bool	CreateSystemProperties ()
	Enable system properties such as hand tracking, and choose environment blend modes.


bool	CreateSession ()
	Create the session and pass the GraphicsBinding to the next pointer of the XrSessionCreateInfo.


bool	CreateSwapchains ()
	Swapchaines creation : there is one swapchain per view / display.


bool	CreateConfigViews ()
	There is one configuration view per view, and it contains the recommended texture resolution in pixels and the recommended swapchain samples.


std::tuple< int64_t, int64_t >	SelectSwapchainPixelFormats ()
	During the creation of the swapchains, we need to check the runtime available pixels formats, and we pick the first one from the list of our supported color and depth formats returned by vtkOpenXRManagerGraphics::GetSupportedColorFormats and vtkOpenXRManagerGraphics::GetSupportedDepthFormats.


Swapchain_t	CreateSwapchain (int64_t format, uint32_t width, uint32_t height, uint32_t sampleCount, XrSwapchainCreateFlags createFlags, XrSwapchainUsageFlags usageFlags)
	Create an XrSwapchain handle used to present rendered image to the user with the given parameters for the XrSwapchainCreateInfo structure.


bool	CreateReferenceSpace ()
	Creates the reference space of type ReferenceSpaceType that will be used to locate views.


bool	CreateOneActionSpace (const XrAction &action, const XrPath &subactionPath, const XrPosef &poseInActionSpace, XrSpace &space)
	For pose actions, we must create an action space to locate it.


bool	CreateSubactionPaths ()
	Creates one subaction path for each hand.


uint32_t	WaitAndAcquireSwapchainImage (const XrSwapchain &swapchainHandle)
	When preparing the rendering for an eye, we must ask the runtime for a texture to draw in it.

Protected Attributes
XrReferenceSpaceType	ReferenceSpaceType = XR_REFERENCE_SPACE_TYPE_STAGE

XrInstance	Instance

XrSystemId	SystemId

XrSession	Session

XrSessionState	SessionState

XrSpace	ReferenceSpace

XrEnvironmentBlendMode	EnvironmentBlendMode

bool	RenderingBackendExtensionSupported = false

std::array< XrPath, 2 >	SubactionPaths

std::vector< XrActionSet >	ActionSets

XrActionSet *	ActiveActionSet = nullptr

XrTime	PredictedDisplayTime
	Store the frame predicted display time in WaitAndBeginFrame To get the action data at this time and to submit it in EndFrame.

bool	SessionRunning = false

bool	ShouldRenderCurrentFrame = false

bool	StorePoseVelocities = false

vtkSmartPointer< vtkOpenXRManagerGraphics >	GraphicsStrategy

vtkSmartPointer< vtkOpenXRManagerConnection >	ConnectionStrategy


struct {

bool DepthExtensionSupported { false }

bool ControllerModelExtensionSupported { false }

bool UnboundedRefSpaceSupported { false }

bool SpatialAnchorSupported { false }

bool HandInteractionSupported { false }

bool HandTrackingSupported { false }

bool RemotingSupported { false }

}	OptionalExtensions
	Structure to hold optional extensions loaded with SelectExtensions.


std::unique_ptr< RenderResources_t >	RenderResources {}

Static Protected Attributes
static constexpr XrFormFactor	FormFactor = XR_FORM_FACTOR_HEAD_MOUNTED_DISPLAY

static constexpr XrViewConfigurationType	ViewType = XR_VIEW_CONFIGURATION_TYPE_PRIMARY_STEREO

static constexpr uint32_t	StereoViewCount = 2

Detailed Description

Singleton class that holds a collection of utility functions and member variables to communicate with the OpenXR runtime.

vtkOpenXRManager is not a vtkObject, the singleton unique instance gets allocated on the stack the first time vtkOpenXRManager::GetInstance() is called.

Definition at line 32 of file vtkOpenXRManager.h.

Member Enumeration Documentation

◆ OutputLevel

enum vtkOpenXRManager::OutputLevel

Enumerator
DebugOutput
WarningOutput
ErrorOutput

Definition at line 46 of file vtkOpenXRManager.h.

◆ ControllerIndex

enum vtkOpenXRManager::ControllerIndex

Enumerator
Inactive
Left
Right
Head
Generic
NumberOfControllers

Definition at line 324 of file vtkOpenXRManager.h.

Constructor & Destructor Documentation

◆ vtkOpenXRManager()

vtkOpenXRManager::vtkOpenXRManager ( )

protected

◆ ~vtkOpenXRManager()

vtkOpenXRManager::~vtkOpenXRManager ( )

protecteddefault

Member Function Documentation

◆ GetInstance()

static vtkOpenXRManager & vtkOpenXRManager::GetInstance ( )

inlinestatic

Return the singleton instance.

Definition at line 39 of file vtkOpenXRManager.h.

◆ XrCheckOutput()

bool vtkOpenXRManager::XrCheckOutput	(	OutputLevel	level,
		const XrResult &	,
		const std::string &	message
	)

Utility function to check the XrResult, print the result message as a debug, warning or error message if the result failed.