Open Inventor Release 2024.2.0
 
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SoTexture2 Class Reference

2D texture mapping node. More...

#include <Inventor/nodes/SoTexture2.h>

+ Inheritance diagram for SoTexture2:

Public Types

enum  Loading {
  AUTO = 0 ,
  MANUAL
}
 Loading mode. More...
 
typedef void SoTexture2CB(void *userData, SoTexture2 *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 ,
  DDS ,
  HDRI ,
  NUM_FILETYPES
}
 File Type possible values. More...
 

Public Member Functions

virtual SoType getTypeId () const
 Returns the type identifier for this specific instance.
 
void setStartLoadingCallback (SoTexture2CB *cb, void *userData)
 Callback invoked when starting to load the texture.
 
void setFinishLoadingCallback (SoTexture2CB *cb, void *userData)
 Callback invoked when the texture is loaded and ready to use.
 
void loadTexture ()
 Loads the texture if the loadingMode field is set to MANUAL.
 
 SoTexture2 ()
 Creates a texture node with default settings.
 
- 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 SoNodecopy (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 SoFieldgetField (const SbName &fieldName) const
 Returns a the field of this object whose name is fieldName.
 
virtual SoFieldgetEventIn (const SbName &fieldName) const
 Returns a the eventIn with the given name.
 
virtual SoFieldgetEventOut (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 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 SbRasterImagereadTexture (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 SoNodegetByName (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
 Name of the file from which to read texture image.
 
SoSFImage image
 Contains an in-memory representation of the texture map.
 
SoSFEnum wrapT
 Indicates what to do when texture coordinates in the T (vertical) direction lie outside the range 0-1.
 
SoSFEnum loadingMode
 Specifies the loading mode.
 
SoSFNode renderToTextureProperty
 Specifies an SoRenderToTextureProperty node containing a scene graph that will be rendered to create the texture image.
 
- 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

2D texture mapping node.

This property node defines a texture map and parameters for that map. This map applies to the current texture unit (see SoTextureUnit) and is used to apply texture to subsequent shapes as they are rendered. The image may be loaded from a file, loaded from an image in memory or created by rendering a scene graph.

Loading an image

The texture can be read from a file specified in the filename field. Open Inventor supports most common file formats including: BMP, DDS, GIF, JPEG, PNG and TIFF. See SoRasterImageRW for a complete list. If Open Inventor recognizes the extension part of the file name, for example "png" for a PNG format image, it will automatically use the corresponding image reader (SoPNGImageRW). If the file extension is not recognized, Open Inventor will attempt to determine the actual image file format by opening the file with each of the built-in image file reader classes.

Note that the image file is read immediately when the filename field is set. If you want to postpone the texture loading, set the loadingMode field to MANUAL before setting the filename field. In this case, you must call loadTexture() to load and display the texture. Alternatively, consider using SoExtTexture2, which defers loading the image until the texture node is actually traversed.

Once the texture has been read, the image field contains the texture data. However, this field is marked so the image is not written out when the texture node is written to a file. To turn off texturing, set the filename field to an empty string ("").

DDS format files load faster because the compressed image can be sent directly to the graphics hardware. This format can also embed mipmaps (levels of resolution). Note that the image field is not filled with the image data when using DDS files. DDS format is not supported on all hardware. The GL_EXT_texture_compression_s3tc extension is required. If it is not available, the DDS texture is not loaded.

Textures can also be specified in memory by setting the image field to contain the texture data. Doing so resets the filename to the empty string.

Textures can also be rendered from a scene graph using the renderToTextureProperty field. If a value is specified for this field, the image and filename fields are ignored.

Modifying a texture image

You can modify a subset of the image without causing the OpenGL texture to be recreated. Open Inventor will automatically use glTexSubImage2D if the image is modified using the SoSFImage::setSubValue() method. This is much more efficient than using the startEditing and finishEditing methods because when these methods are used Open Inventor must assume that the entire image has been modified.

Texture quality

The SoTexture::minFilter and SoTexture::magFilter fields can be used to specifically control the texture minification and magnification "filter" algorithms used by the GPU. The minification filter is used when the rendered size of the geometry is smaller than the texture image (for example: far away objects). Conversely the magnification filter is used when the rendered size of the geometry is larger than the texture image (near objects). Effectively these settings control whether the GPU will select the "nearest" texel value or do linear interpolation (smoothing) or (in the case of minification) interpolate between mipmap levels. Using NEAREST may allow better performance, but the LINEAR options produce much higher quality rendering. If mipmap filtering is required, mipmaps are automatically created.

NOTE: The default value for these SoTexture fields is AUTO, meaning that the minification and magnification algorithms are actually controlled by the SoComplexity::textureQuality field. To maximize performance, the default value for textureQuality is 0.5, which selects NEAREST filtering. For best image quality we recommend setting this field to (at least) 0.75.

Transparency

Texture images can contain transparency (alpha values less than 1) and modify the transparency of geometry in the scene. Also note that some image file formats, for example JPEG, do not support transparency information (alpha channel).

Non-power-of-two images

If the texture image's width or height is not a power of 2, e.g. 128 or 256, 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. Almost all modern graphics hardware support this extension (check using SoTexture::isSupported(HW_NPOT)). However if your application must run on graphics hardware that does not support NPOT, please read the following.

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.

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). (Not applicable if GPU supports non-power-of-2 images. Most do.)

Performance Note: The performance advantage of modifying a sub-image is significantly less when the texture image needs to be automatically scaled to a power of 2. This is because each sub-image must be scaled before sending it to OpenGL. (Not applicable if GPU supports non-power-of-2 images. Most do.)

FILE FORMAT/DEFAULT

    Texture2 {
    filename ""
    image 0 0 0
    wrapS REPEAT
    wrapT REPEAT
    model MODULATE
    enableCompressedTexture FALSE
    blendColor 0 0 0
    enableBorder FALSE
    borderColor 0 0 0 1
    maxAnisotropy 1.0
    minFilter AUTO
    magFilter AUTO
    loadingMode AUTO
    useAutoMipmap FALSE
    internalFormat AUTO_INTERNAL_FORMAT
    renderToTextureProperty NULL
    }

ACTION BEHAVIOR

SEE ALSO

SoComplexity, SoExtTexture2, SoMaterial, SoTexture, SoTexture2Transform, SoTexture3, SoTextureCombiner, SoTextureCoordinate2, SoTextureCoordinateBinding, SoTextureCoordinateFunction, SoTextureCubeMap, SoTextureUnit

Definition at line 261 of file SoTexture2.h.

Member Typedef Documentation

◆ SoTexture2CB

typedef void SoTexture2::SoTexture2CB(void *userData, SoTexture2 *tex)

Definition at line 272 of file SoTexture2.h.

Member Enumeration Documentation

◆ Loading

Loading mode.

Enumerator
AUTO 

The texture is loaded when filename field is set.

MANUAL 

The texture is loaded when the loadTexture method is called.

Definition at line 275 of file SoTexture2.h.

Constructor & Destructor Documentation

◆ SoTexture2()

SoTexture2::SoTexture2 ( )

Creates a texture node with default settings.

Member Function Documentation

◆ getClassTypeId()

static SoType SoTexture2::getClassTypeId ( )
static

Returns the type identifier for this class.


◆ getTypeId()

virtual SoType SoTexture2::getTypeId ( ) const
virtual

Returns the type identifier for this specific instance.

Reimplemented from SoTexture.

Reimplemented in SoUniformGridClipping, and SoUniformGridProjectionClipping.

◆ loadTexture()

void SoTexture2::loadTexture ( )

Loads the texture if the loadingMode field is set to MANUAL.

A typical use is:

texture = new SoTexture2();
texture->loadingMode.setValue(SoTexture2::MANUAL);
texture->filename = "texture.png";
root->addChild(texture);
...
static void*
threadRoutine( void* userData )
{
texture->loadTexture();
return 0;
}
...
SbThread::create(threadRoutine, NULL);
static int setPriorityLevel(int)
Set the priority of the current thread.
@ MANUAL
The texture is loaded when the loadTexture method is called.
Definition SoTexture2.h:284
SoTexture2()
Creates a texture node with default settings.

◆ setFinishLoadingCallback()

void SoTexture2::setFinishLoadingCallback ( SoTexture2CB cb,
void *  userData 
)

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

◆ setStartLoadingCallback()

void SoTexture2::setStartLoadingCallback ( SoTexture2CB cb,
void *  userData 
)

Callback invoked when starting to load the texture.

Member Data Documentation

◆ filename

SoSFFilePathString SoTexture2::filename

Name of the 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 299 of file SoTexture2.h.

◆ image

SoSFImage SoTexture2::image

Contains an in-memory representation of the texture map.

It is either the contents of the file read from filename, an image read directly from an Open Inventor file, or an image set programmatically using the methods provided by SoSFImage.

Definition at line 308 of file SoTexture2.h.

◆ loadingMode

SoSFEnum SoTexture2::loadingMode

Specifies the loading mode.

Use enum Loading. Default is AUTO.

NOTE: field available since Open Inventor 6.0

Definition at line 323 of file SoTexture2.h.

◆ renderToTextureProperty

SoSFNode SoTexture2::renderToTextureProperty

Specifies an SoRenderToTextureProperty node containing a scene graph that will be rendered to create the texture image.

Null by default.

NOTE: The image field is not updated when the scene graph is rendered. That would require reading back the frame buffer from the graphics board, which can be time consuming and would reduce performance.

NOTE: field available since Open Inventor 6.0

Definition at line 337 of file SoTexture2.h.

◆ wrapT

SoSFEnum SoTexture2::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 315 of file SoTexture2.h.


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