Extended texture mapping node. More...

#include <Inventor/nodes/SoExtTexture2.h>

Inheritance diagram for SoExtTexture2:

Public Types
enum	Sync { SYNCHRONOUS = 0 , ASYNCHRONOUS }
	Synchrone/asynchrone loading mode. More...

enum	Loading { AUTO = 0 , MANUAL }
	Loading mode. More...

typedef void	SoExtTexture2CB(void userData, SoExtTexture2 tex)

Public Types inherited from SoTexture
enum	InternalFormat { AUTO_INTERNAL_FORMAT , ALPHA_FORMAT , ALPHA4 , ALPHA8 , ALPHA12 , ALPHA16 , LUMINANCE_FORMAT , LUMINANCE4 , LUMINANCE8 , LUMINANCE12 , LUMINANCE16 , LUMINANCE_ALPHA , LUMINANCE4_ALPHA4 , LUMINANCE6_ALPHA2 , LUMINANCE8_ALPHA8 , LUMINANCE12_ALPHA4 , LUMINANCE12_ALPHA12 , LUMINANCE16_ALPHA16 , INTENSITY_FORMAT , INTENSITY4 , INTENSITY8 , INTENSITY12 , INTENSITY16 , R3_G3_B2 , RGB_FORMAT , RGB4 , RGB5 , RG8 , RGB8 , RGB10 , RGB12 , RGB16 , RGBA_FORMAT , RGBA2 , RGBA4 , RGB5_ALPHA1 , RGBA8 , RGB10_ALPHA2 , RGBA12 , RGBA16 , RGBA_FLOAT32 , RGB_FLOAT32 , ALPHA_FLOAT32 , INTENSITY_FLOAT32 , LUMINANCE_FLOAT32 , LUMINANCE_ALPHA_FLOAT32 , RGBA_FLOAT16 , RGB_FLOAT16 , ALPHA_FLOAT16 , INTENSITY_FLOAT16 , LUMINANCE_FLOAT16 , LUMINANCE_ALPHA_FLOAT16 , COMPRESSED_ALPHA , COMPRESSED_LUMINANCE , COMPRESSED_LUMINANCE_ALPHA , COMPRESSED_INTENSITY , COMPRESSED_RGB , COMPRESSED_RGBA , COMPRESSED_LUMINANCE_LATC1 , COMPRESSED_SIGNED_LUMINANCE_LATC1 , COMPRESSED_LUMINANCE_ALPHA_LATC2 , COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2 , COMPRESSED_RED_RGTC1 , COMPRESSED_SIGNED_RED_RGTC1 , COMPRESSED_RED_GREEN_RGTC2 , COMPRESSED_SIGNED_RED_GREEN_RGTC2 , DEPTH_COMPONENT16 , DEPTH_COMPONENT24 , DEPTH24_STENCIL8 , R8I , R8UI , R16I , R16UI , R32I , R32UI , RG8I , RG8UI , RG16I , RG16UI , RG32I , RG32UI , RGB8I , RGB8UI , RGB16I , RGB16UI , RGB32I , RGB32UI , RGBA8I , RGBA8UI , RGBA16I , RGBA16UI , RGBA32I , RGBA32UI }
	Texture internal storage format. More...

enum	Model { MODULATE = SbEnums::TEX_MODEL_MODULATE , DECAL = SbEnums::TEX_MODEL_DECAL , BLEND = SbEnums::TEX_MODEL_BLEND , REPLACE = SbEnums::TEX_MODEL_REPLACE , ADD = SbEnums::TEX_MODEL_ADD , COMBINE = SbEnums::TEX_MODEL_COMBINE }
	Texture Combiner Functions. More...

enum	Wrap { REPEAT = SbEnums::TEX_ADDRESS_REPEAT , CLAMP = SbEnums::TEX_ADDRESS_CLAMP , CLAMP_TO_BORDER = SbEnums::TEX_ADDRESS_CLAMP_BORDER , CLAMP_TO_EDGE = SbEnums::TEX_ADDRESS_CLAMP_TO_EDGE , MIRRORED_REPEAT = SbEnums::TEX_ADDRESS_MIRROR_REPEAT }
	Texture wrap type. More...

enum	Filter { AUTO = SbEnums::TEX_FILTER_AUTO , NEAREST = SbEnums::TEX_FILTER_NEAREST , LINEAR = SbEnums::TEX_FILTER_LINEAR , NEAREST_MIPMAP_NEAREST = SbEnums::TEX_FILTER_NEAREST_MIPMAP_NEAREST , NEAREST_MIPMAP_LINEAR = SbEnums::TEX_FILTER_NEAREST_MIPMAP_LINEAR , LINEAR_MIPMAP_NEAREST = SbEnums::TEX_FILTER_LINEAR_MIPMAP_NEAREST , LINEAR_MIPMAP_LINEAR = SbEnums::TEX_FILTER_LINEAR_MIPMAP_LINEAR }
	Specifies the OpenGL filtering method for minification and magnification. More...

enum	HW_Feature { HW_NPOT = 0 , HW_FLOATFORMAT , HW_DEPTHFORMAT , HW_AUTOMIPMAP , HW_BORDER_CLAMP , HW_EDGE_CLAMP , HW_MIRRORED_REPEAT , HW_COMPRESSION_S3TC , HW_COMPRESSION_LATC , HW_COMPRESSION_RGTC }

enum	FileType { UNKNOWN , RGB , SGI , TIFF , GIF , JPEG , BMP , PNG , JPEG2000 , PGX , PNM , RAS , DDS , HDRI , NUM_FILETYPES }
	File Type possible values. More...

Public Member Functions
virtual SoType	getTypeId () const
	Returns the type identifier for this specific instance.

	SoExtTexture2 ()
	Creates a texture node with default settings.

void	allowPrequalifyFile (SbBool)
	If TRUE, allows the PrequalifyFile callback to be called.

void	getImageSize (SbVec2s &size, int &nc)
	Returns the size and the number of components in the image.

void	addOnLoadStartCB (SoExtTexture2CB cb, void userData)
	Callback invoked when starting loading the texture.

void	addOnLoadFinishCB (SoExtTexture2CB cb, void userData)
	Callback invoked when the texture is loaded and ready to use.

void	addOnUnloadCB (SoExtTexture2CB cb, void userData)
	Callback invoked when the texture is unloaded.

void	loadTexture ()
	Loads the texture if the loading mode is set to MANUAL.

Public Member Functions inherited from SoTexture
void	setBitmapFileType (FileType in_type)
	Sets the texture file format.

FileType	getBitmapFileType (void)
	Gets the texture file format.

virtual void	setOverride (const SbBool state)
	Set the state of the override field.

virtual SbBool	isOverride () const
	Returns the state of the override field.

Public Member Functions inherited from SoNode
virtual SoNode *	copy (SbBool copyConnections=FALSE) const
	Creates and returns an exact copy of the node.

virtual SbBool	affectsState () const
	Returns TRUE if a node has an effect on the state during traversal.

virtual void	touch ()
	Marks an instance as modified, simulating a change to it.

Public Member Functions inherited from SoFieldContainer
void	setToDefaults ()
	Sets all fields in this object to their default values.

SbBool	hasDefaultValues () const
	Returns TRUE if all of the object's fields have their default values.

SbBool	fieldsAreEqual (const SoFieldContainer *fc) const
	Returns TRUE if this object's fields are exactly equal to fc's fields.

void	copyFieldValues (const SoFieldContainer *fc, SbBool copyConnections=FALSE)
	Copies the contents of fc's fields into this object's fields.

SoNONUNICODE SbBool	set (const char *fieldDataString)
	Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.

SbBool	set (const SbString &fieldDataString)
	Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.

void	get (SbString &fieldDataString)
	Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string.

virtual int	getFields (SoFieldList &list) const
	Appends references to all of this object's fields to resultList, and returns the number of fields appended.

virtual int	getAllFields (SoFieldList &list) const
	Returns a list of fields, including the eventIn's and eventOut's.

virtual SoField *	getField (const SbName &fieldName) const
	Returns a the field of this object whose name is fieldName.

virtual SoField *	getEventIn (const SbName &fieldName) const
	Returns a the eventIn with the given name.

virtual SoField *	getEventOut (const SbName &fieldName) const
	Returns the eventOut with the given name.

SbBool	getFieldName (const SoField *field, SbName &fieldName) const
	Returns the name of the given field in the fieldName argument.

SbBool	enableNotify (SbBool flag)
	Notification at this Field Container is enabled (if flag == TRUE) or disabled (if flag == FALSE).

SbBool	isNotifyEnabled () const
	Notification is the process of telling interested objects that this object has changed.

virtual void	setUserData (void *data)
	Sets application data.

void *	getUserData (void) const
	Gets user application data.

Public Member Functions inherited from SoBase
virtual SbName	getName () const
	Returns the name of an instance.

virtual void	setName (const SbName &name)
	Sets the name of an instance.

void	setSynchronizable (const bool b)
	Sets this to be a ScaleViz synchronizable object.

bool	isSynchronizable () const
	Gets the ScaleViz synchronizable state of this object.

Public Member Functions inherited from SoRefCounter
void	ref () const
	Adds a reference to an instance.

void	unref () const
	Removes a reference from an instance.

void	unrefNoDelete () const
	unrefNoDelete() should be called when it is desired to decrement the reference count, but not delete the instance if this brings the reference count to zero.

int	getRefCount () const
	Returns current reference count.

void	lock () const
	lock this instance.

void	unlock () const
	unlock this instance.

Public Member Functions inherited from SoTypedObject
SbBool	isOfType (const SoType &type) const
	Returns TRUE if this object is of the type specified in type or is derived from that type.

template<typename TypedObjectClass >
SbBool	isOfType () const
	Returns TRUE if this object is of the type of class TypedObjectClass or is derived from that class.

Static Public Member Functions
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

static void	setPrequalifyFileCallBack (ExtPrequalifyFileCallback p_cb, void u_data)
	This callback is called by SoExtTexture2 nodes just before opening a file with the proposed path.

static void	setMemorySpace (double megaBytes)
	Sets the system memory space allowed for the texture images.

static double	getMemorySpace ()
	Gets the system memory space allowed for the texture images.

static double	getGlobalMemoryUsed ()
	Return the current system memory used by all texture images.

static void	useTexturePalette (SbBool value)
	If TRUE, uses a 256-color-indexed palette.

Static Public Member Functions inherited from SoTexture
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

static SbBool	isSupported (HW_Feature feature)
	Returns information about hardware support for various texture features.

static SbRasterImage *	readTexture (const SbString &filename, FileType filetype=UNKNOWN)
	Convenience function that loads the image data from any texture file supported by Open Inventor and returns an SbRasterImage object.

Static Public Member Functions inherited from SoNode
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

static SoNode *	getByName (const SbName &name)
	A node's name can be set using SoBase::setName().

static int	getByName (const SbName &name, SoNodeList &list)
	A node's name can be set using SoBase::setName().

Static Public Member Functions inherited from SoFieldContainer
static SoType	getClassTypeId ()
	Returns the type of this class.

Static Public Member Functions inherited from SoBase
static SoType	getClassTypeId ()
	Returns type identifier for this class.

Static Public Member Functions inherited from SoTypedObject
static SoType	getClassTypeId ()
	Returns the type identifier for this class.

Public Attributes
SoSFFilePathString	filename
	Names file from which to read texture image.

SoSFEnum	wrapT
	Indicates what to do when texture coordinates in the T (vertical) direction lie outside the range 0-1.

SoSFBool	loadingStatus
	Tells if the texture is loaded or not (not necessarily displayed)

SoSFEnum	syncMode
	Specifies the synchronous/asynchronous mode.

SoSFEnum	loadingMode
	Specifies the loading mode.

SoSFInt32	loadingThreadPriority
	Specifies the priority of the texture loading thread when activated (syncMode = ASYNCHRONOUS).

Public Attributes inherited from SoTexture
SoSFEnum	internalFormat
	Internal format for texture storage.

SoSFBool	enableCompressedTexture
	Enables storage of textures on the graphics board in compressed form.

SoSFEnum	wrapS
	Indicates what to do when texture coordinates in the S (horizontal) direction lie outside the range 0-1.

SoSFEnum	model
	Specifies how to map texture onto surface.

SoSFColor	blendColor
	Color used for BLEND model.

SoSFBool	enableBorder
	Enables borders for textures.

SoSFVec4f	borderColor
	Defines border color used for border texture filtering.

SoSFFloat	maxAnisotropy
	Specifies on a per-texture object basis, the maximum degree of anisotropy to account for in texture filtering.

SoSFEnum	minFilter
	Specifies the OpenGL minFilter.

SoSFEnum	magFilter
	Specifies the OpenGL magFilter.

Detailed Description

Extended texture mapping node.

This property node defines a texture map and parameters for that map. This map is used to apply texture to subsequent shapes as they are rendered.

The node is similar to SoTexture2, but differs in the following significant ways:

It has no image field.
It doesn't load the texture image into system memory until the node is traversed. Depending on the scene graph, this may significantly reduce the use of system memory, e.g., if the scene has lots of LODs containing textures. On the other hand, when the scene graph is first traversed there may be a small delay while the textures are being loaded.
It has additional features (e.g., support for OpenGL paletted textures) for reducing the use of texture memory.

The texture is read from the file specified by the filename field. There is no image field created. Data is sent directly to OpenGL.

The maximum system memory allowed for all SoExtTexture2 nodes (in total) can be set using setMemorySpace().

If the memory allowed for texture images (setMemorySpace()) would be exceeded by loading a new image, one or more existing images will be deleted from system memory. In most cases OpenGL texture objects will already have been created for the deleted images (i.e. OpenGL has a copy of the images), so this does not affect rendering.

If it is necessary to recreate an OpenGL texture object and the required texture image has been deleted from system memory, the node will automatically re-read the image file. For this reason, applications should be careful not to remove image files that might be needed during program execution.

To reduce the use of texture memory (by approximately a factor of 4), use the useTexturePalette() method to request the image be converted to a 256-color paletted image. This feature is available only if the driver supports the GL_EXT_paletted_texture or GL_EXT_texture_color_table extension.

If the texture image's width or height is not a power of 2, and the Non Power Of Two (NPOT) extension is available on your graphics board, by default Open Inventor will send the image to OpenGL without modification. However, if the texture image's width or height is not a power of 2 (and the Non Power Of Two (NPOT) extension is not available on your graphics board), or the image's width or height is greater than the maximum supported by OpenGL, then the image will be automatically scaled up or down to the nearest power of 2 or the maximum texture size. For maximum speed, point-sampling is used to do the scaling. If you want higher quality scaling, pre-filter your images to a power of 2 smaller than the maximum texture size. Use the OpenGL glGetIntegerv(GL_MAX_TEXTURE_SIZE...) call to determine the maximum texture dimension for a specific OpenGL implementation. Setting the environment variable OIV_USE_NPOT to 0 will force the image to be rescaled (when necessary) even if the NPOT extension is available.

The quality of the texturing is affected by the textureQuality field of the SoComplexity node. The textureQuality field affects what kind of filtering is done to the texture when it must be minified or magnified. The mapping of a particular texture quality value to a particular OpenGL filtering technique is platform dependent, and varies based on the texturing performance. If mipmap filtering is required, mipmaps are automatically created using a simple box filter.

Performance Note: Automatic scaling of texture images to a power of 2 is a very convenient feature for prototyping, but it does take additional time the first time the texture node is traversed for rendering. For large images, or a large number of images, this can make the application seem slow while starting up or loading a new data file. Avoid this effect by either pre-scaling the image or by storing it as a sub-image in a "power of 2" image (then provide explicit texture coordinates such that only the sub-image is used).

FILE FORMAT/DEFAULT

filename	""
enableCompressedTexture	FALSE
wrapS	REPEAT
wrapT	REPEAT
model	MODULATE
blendColor	0 0 0
loadingStatus	FALSE
syncMode	SYNCHRONOUS
loadingMode	AUTO
loadingThreadPriorty	1
enableBorder	FALSE
borderColor	0 0 0 0
maxAnisotropy	1.0
minFilter	AUTO
magFilter	AUTO
useAutoMipmap	FALSE
internalFormat	AUTO_INTERNAL_FORMAT

ACTION BEHAVIOR

SoGLRenderAction

SoCallbackAction

SoTextureImageElement

Member Typedef Documentation

◆ SoExtTexture2CB

typedef void SoExtTexture2::SoExtTexture2CB(void *userData, SoExtTexture2 *tex)

Definition at line 189 of file SoExtTexture2.h.

Member Enumeration Documentation

◆ Loading

enum SoExtTexture2::Loading

Loading mode.

Enumerator
AUTO	The texture is loaded at the node's traversal.
MANUAL	The texture is loaded by the user using the loadTexture method.

Definition at line 206 of file SoExtTexture2.h.

◆ Sync

enum SoExtTexture2::Sync

Synchrone/asynchrone loading mode.

Enumerator
SYNCHRONOUS	The loading is blocking (no thread launched).
ASYNCHRONOUS	The loading is non blocking (the loading is done within a thread).

Definition at line 192 of file SoExtTexture2.h.

Constructor & Destructor Documentation

◆ SoExtTexture2()

SoExtTexture2::SoExtTexture2 ( )

Creates a texture node with default settings.

Member Function Documentation

◆ addOnLoadFinishCB()

void SoExtTexture2::addOnLoadFinishCB	(	SoExtTexture2CB *	cb,
		void *	userData
	)

Callback invoked when the texture is loaded and ready to use.

◆ addOnLoadStartCB()

void SoExtTexture2::addOnLoadStartCB	(	SoExtTexture2CB *	cb,
		void *	userData
	)

Callback invoked when starting loading the texture.

◆ addOnUnloadCB()

void SoExtTexture2::addOnUnloadCB	(	SoExtTexture2CB *	cb,
		void *	userData
	)

Callback invoked when the texture is unloaded.

◆ allowPrequalifyFile()

void SoExtTexture2::allowPrequalifyFile ( SbBool )

If TRUE, allows the PrequalifyFile callback to be called.

◆ getClassTypeId()

static SoType SoExtTexture2::getClassTypeId ( )

static

Returns the type identifier for this class.

◆ getGlobalMemoryUsed()

static double SoExtTexture2::getGlobalMemoryUsed ( )

static

Return the current system memory used by all texture images.

◆ getImageSize()

void SoExtTexture2::getImageSize	(	SbVec2s &	size,
		int &	nc
	)

Returns the size and the number of components in the image.

◆ getMemorySpace()

static double SoExtTexture2::getMemorySpace ( )

static

Gets the system memory space allowed for the texture images.

This value is specified in megabytes (MB).

◆ getTypeId()

virtual SoType SoExtTexture2::getTypeId ( ) const

virtual

Returns the type identifier for this specific instance.

Reimplemented from SoTexture.

◆ loadTexture()

void SoExtTexture2::loadTexture ( )

Loads the texture if the loading mode is set to MANUAL.

◆ setMemorySpace()

static void SoExtTexture2::setMemorySpace ( double megaBytes )

static

Sets the system memory space allowed for the texture images.

This value is specified in megabytes (MB). The default is 16 MB.

◆ setPrequalifyFileCallBack()

static void SoExtTexture2::setPrequalifyFileCallBack	(	ExtPrequalifyFileCallback *	p_cb,
		void *	u_data
	)

static

This callback is called by SoExtTexture2 nodes just before opening a file with the proposed path.

It allows you to modify the path and/or indicate that the texture has already been handled.

You could use the callback, for example, to load an image in a file format that Open Inventor doesn't natively support. The callback could

detect (by examining the path) that the file is of a particular format,
call application-supplied code to read the texture file
set the image into the image field of the texture node
set the flag indicating that the texture has been handled.

◆ useTexturePalette()

static void SoExtTexture2::useTexturePalette ( SbBool value )

static

If TRUE, uses a 256-color-indexed palette.

You must call this method before the textures are loaded. Default is FALSE.
NOTE: If the field enableCompressedTexture is set TRUE, its value takes precedence over this request to use a paletted texture. Compressed textures will be used.

Member Data Documentation

◆ filename

SoSFFilePathString SoExtTexture2::filename

Names file from which to read texture image.

The standard image file formats are supported. See SoRasterImageRW for the list. If the filename is not an absolute path name, the list of directories maintained by SoInput is searched. If the texture is not found in any of those directories, then the file is searched for relative to the directory from which the SoTexture2 node was read. For example, if an SoTexture2 node with a filename of "../tofu.rgb" is read from /usr/people/bob/models/food.iv, then /usr/people/bob/tofu.rgb will be read (assuming tofu.rgb isn't found in the directories maintained by SoInput).

Definition at line 230 of file SoExtTexture2.h.

◆ loadingMode

SoSFEnum SoExtTexture2::loadingMode

Specifies the loading mode.

Use enum Loading. Default is AUTO.

Definition at line 255 of file SoExtTexture2.h.

◆ loadingStatus

SoSFBool SoExtTexture2::loadingStatus

Tells if the texture is loaded or not (not necessarily displayed)

Definition at line 243 of file SoExtTexture2.h.

◆ loadingThreadPriority

SoSFInt32 SoExtTexture2::loadingThreadPriority

Specifies the priority of the texture loading thread when activated (syncMode = ASYNCHRONOUS).

This part uses the SbThread class.

Definition at line 261 of file SoExtTexture2.h.

◆ syncMode

SoSFEnum SoExtTexture2::syncMode

Specifies the synchronous/asynchronous mode.

Use enum Sync. Default is SYNCHRONOUS.

Definition at line 249 of file SoExtTexture2.h.

◆ wrapT

SoSFEnum SoExtTexture2::wrapT

Indicates what to do when texture coordinates in the T (vertical) direction lie outside the range 0-1.

Use enum SoTexture::Wrap. Default is REPEAT.

Definition at line 237 of file SoExtTexture2.h.

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

Inventor/nodes/SoExtTexture2.h

Open Inventor Release 2023.2.3

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Detailed Description

FILE FORMAT/DEFAULT

ACTION BEHAVIOR

SEE ALSO

Member Typedef Documentation

◆ SoExtTexture2CB

Member Enumeration Documentation

◆ Loading

◆ Sync

Constructor & Destructor Documentation

◆ SoExtTexture2()

Member Function Documentation

◆ addOnLoadFinishCB()

◆ addOnLoadStartCB()

◆ addOnUnloadCB()

◆ allowPrequalifyFile()

◆ getClassTypeId()

◆ getGlobalMemoryUsed()

◆ getImageSize()

◆ getMemorySpace()

◆ getTypeId()

◆ loadTexture()

◆ setMemorySpace()

◆ setPrequalifyFileCallBack()

◆ useTexturePalette()

Member Data Documentation

◆ filename

◆ loadingMode

◆ loadingStatus

◆ loadingThreadPriority

◆ syncMode

◆ wrapT