Class SoExtTexture2
- java.lang.Object
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- com.openinventor.inventor.Inventor
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- com.openinventor.inventor.misc.SoBase
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- com.openinventor.inventor.fields.SoFieldContainer
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- com.openinventor.inventor.nodes.SoNode
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- com.openinventor.inventor.nodes.SoTexture
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- com.openinventor.inventor.nodes.SoExtTexture2
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- All Implemented Interfaces:
SafeDisposable
public class SoExtTexture2 extends SoTexture
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:1. It has no image field.
2. 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.
3. 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 usingsetMemorySpace()
.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:
ExtTexture2 {
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
Sets current texture in state. Sets:SoTextureImageElement
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
SoExtTexture2.ImageSize
static class
SoExtTexture2.Loadings
Loading mode.static class
SoExtTexture2.Syncs
Synchrone/asynchrone loading mode.-
Nested classes/interfaces inherited from class com.openinventor.inventor.nodes.SoTexture
SoTexture.FileTypes, SoTexture.Filters, SoTexture.HW_Features, SoTexture.InternalFormats, SoTexture.Models, SoTexture.WrapType
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Nested classes/interfaces inherited from class com.openinventor.inventor.nodes.SoNode
SoNode.RenderModes
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Nested classes/interfaces inherited from class com.openinventor.inventor.Inventor
Inventor.ConstructorCommand
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Field Summary
Fields Modifier and Type Field Description SoSFFilePathString
filename
Names file from which to read texture image.SoSFEnum<SoExtTexture2.Loadings>
loadingMode
Specifies the loading mode.SoSFBool
loadingStatus
Tells if the texture is loaded or not (not necessarily displayed)SoSFInt32
loadingThreadPriority
Specifies the priority of the texture loading thread when activated (syncMode = ASYNCHRONOUS).SoSFEnum<SoExtTexture2.Syncs>
syncMode
Specifies the synchronous/asynchronous mode.SoSFEnum<SoTexture.WrapType>
wrapT
Indicates what to do when texture coordinates in the T (vertical) direction lie outside the range 0-1.-
Fields inherited from class com.openinventor.inventor.nodes.SoTexture
blendColor, borderColor, enableBorder, enableCompressedTexture, internalFormat, magFilter, maxAnisotropy, minFilter, model, wrapS
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Fields inherited from class com.openinventor.inventor.Inventor
VERBOSE_LEVEL, ZeroHandle
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Constructor Summary
Constructors Constructor Description SoExtTexture2()
Creates a texture node with default settings.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description void
allowPrequalifyFile(boolean name_11844)
If true, allows the PrequalifyFile callback to be called.static double
getGlobalMemoryUsed()
Return the current system memory used by all texture images.SoExtTexture2.ImageSize
getImageSize()
Returns the size and the number of components in the image.static double
getMemorySpace()
Gets the system memory space allowed for the texture images.void
loadTexture()
Loads the texture if the loading mode is set to MANUAL.static void
setMemorySpace(double megaBytes)
Sets the system memory space allowed for the texture images.static void
useTexturePalette(boolean value)
If true, uses a 256-color-indexed palette.-
Methods inherited from class com.openinventor.inventor.nodes.SoTexture
getBitmapFileType, isSupported, readTexture, readTexture, setBitmapFileType
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Methods inherited from class com.openinventor.inventor.nodes.SoNode
affectsState, callback, copy, copy, distribute, doAction, getAlternateRep, getBoundingBox, getByName, getMatrix, getPrimitiveCount, getRenderEngineMode, getRenderUnitID, GLRender, GLRenderBelowPath, GLRenderInPath, GLRenderOffPath, grabEventsCleanup, grabEventsSetup, handleEvent, isBoundingBoxIgnoring, isOverride, pick, rayPick, search, setOverride, touch, write
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Methods inherited from class com.openinventor.inventor.fields.SoFieldContainer
copyFieldValues, copyFieldValues, enableNotify, fieldsAreEqual, get, getAllFields, getEventIn, getEventOut, getField, getFieldName, hasDefaultValues, isNotifyEnabled, set, setToDefaults
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Methods inherited from class com.openinventor.inventor.misc.SoBase
dispose, getName, isDisposable, isSynchronizable, setName, setSynchronizable
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Methods inherited from class com.openinventor.inventor.Inventor
getNativeResourceHandle
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Field Detail
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filename
public final SoSFFilePathString filename
Names file from which to read texture image. The standard image file formats are supported. SeeSoRasterImageRW
for the list. If the filename is not an absolute path name, the list of directories maintained bySoInput
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 theSoTexture2
node was read. For example, if anSoTexture2
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 bySoInput
).
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wrapT
public final SoSFEnum<SoTexture.WrapType> wrapT
Indicates what to do when texture coordinates in the T (vertical) direction lie outside the range 0-1. . Default is REPEAT.
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loadingStatus
public final SoSFBool loadingStatus
Tells if the texture is loaded or not (not necessarily displayed)
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syncMode
public final SoSFEnum<SoExtTexture2.Syncs> syncMode
Specifies the synchronous/asynchronous mode. . Default is SYNCHRONOUS.
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loadingMode
public final SoSFEnum<SoExtTexture2.Loadings> loadingMode
Specifies the loading mode. . Default is AUTO.
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loadingThreadPriority
public final SoSFInt32 loadingThreadPriority
Specifies the priority of the texture loading thread when activated (syncMode = ASYNCHRONOUS). This part uses the SbThread class.
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Method Detail
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getImageSize
public SoExtTexture2.ImageSize getImageSize()
Returns the size and the number of components in the image.
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setMemorySpace
public static void setMemorySpace(double megaBytes)
Sets the system memory space allowed for the texture images. This value is specified in megabytes (MB). The default is 16 MB.
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getMemorySpace
public static double getMemorySpace()
Gets the system memory space allowed for the texture images. This value is specified in megabytes (MB).
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allowPrequalifyFile
public void allowPrequalifyFile(boolean name_11844)
If true, allows the PrequalifyFile callback to be called.
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loadTexture
public void loadTexture()
Loads the texture if the loading mode is set to MANUAL.
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getGlobalMemoryUsed
public static double getGlobalMemoryUsed()
Return the current system memory used by all texture images.
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useTexturePalette
public static void useTexturePalette(boolean value)
If true, uses a 256-color-indexed palette. You must call this method before the textures are loaded. Default is false.
NOTE: If the fieldenableCompressedTexture
is set true, its value takes precedence over this request to use a paletted texture. Compressed textures will be used.
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