SoTextureScalePolicy(3) The SoTextureScalePolicy class is a node for controlling the texture scale policy.


#include <Inventor/nodes/SoTextureScalePolicy.h>

Inherits SoNode.

Public Types


Public Member Functions

virtual SoType getTypeId (void) const

SoTextureScalePolicy (void)

virtual void GLRender (SoGLRenderAction *action)

Static Public Member Functions

static SoType getClassTypeId (void)

static void initClass (void)

Public Attributes

SoSFEnum policy

SoSFFloat quality

Protected Member Functions

virtual const SoFieldData * getFieldData (void) const

virtual ~SoTextureScalePolicy ()

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

Additional Inherited Members

Detailed Description

The SoTextureScalePolicy class is a node for controlling the texture scale policy.

If a texture map is of size != 2^n, it must be scaled before OpenGL can handle it. This node enables you to control how/if textures are scaled before it is sent to OpenGL.

Also, if a texture map is bigger than the maximum OpenGL texture size (implementation and context dependent), it will be scaled down to the maximum size. You can avoid this by setting the texture policy to SoTextureScalePolicy::FRACTURE, in which case the texture will be split into several small subtextures before the geometry using the texture is rendered.

Setting SoTextureScalePolicy::policy to SoTextureScalePolicy::FRACTURE will also cause the internal texture handling unit in Coin to automatically downsample the individual subtextures to not use more graphics card memory than necessary to cover the current screen size of the texture.

These two aspects of SoTextureScalePolicy::FRACTURE rendering together, subtexture fracturing and automatic downsampling, makes it possible to have textures with almost unlimited size. The only real limit is the amount of memory on the system, since the entire texture must fit into CPU memory.

The SoTextureScalePolicy::FRACTURE policy is also very handy for using the Coin library's built-in handling of non-power-of-2 textures. This will then be done completely transparent to the application programmer, for maximum convenience. Below is a very simple example which demonstrates how to use it. The texture has dimensions 3x3, but no scaling (and thereby interpolation) will have to be done when SoTextureScalePolicy::FRACTURE is specified:

  #Inventor V2.1 ascii
  Separator {
     TextureScalePolicy { policy FRACTURE }
     Complexity { textureQuality 0.01 }  # don't generate smoothed mipmaps
     Texture2 { 
        image 3 3 4  # dimensions 3x3, RGBA (4-component) image
        0xff0000ff 0x00ff00ff 0x0000ffff  # red, green, blue
        0xffff00ff 0xff00ffff 0x00ffffff  # yellow, magenta, cyan
        0x222222ff 0x777777ff 0xccccccff  # dark, medium and light grey
     Cube { }
Be aware that the triangle throughput is much slower when using the FRACTURE texture mode, since all triangles need to be clipped (using the CPU) against subtextures. It's therefore usually not a good idea to use the FRACTURE mode on large triangle meshes.
Be aware that this class is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.
    TextureScalePolicy {
        policy USE_TEXTURE_QUALITY
        quality 0.5


Coin 2.0

Member Enumeration Documentation

enum SoTextureScalePolicy::Policy

Enumerates the available policy settings.


Uses the texture quality to decide whether to scale up or down.
Always scales down.
Always scales up.
Splits the texture into several subtextures, and clips the geometry into each subtexture. Also automatically downsamples the subtextures to not use more graphics card memory than necessary versus the current screen size of the texture.

These two features makes it possible to have textures with almost unlimited size. The only real limit is the amount of memory on the system, since the entire texture must fit into CPU memory.

Be aware that the rendering is quite slow with this mode if the texture(s) will be mapped onto lots of polygon primitives.

Constructor & Destructor Documentation

SoTextureScalePolicy::SoTextureScalePolicy (void)


SoTextureScalePolicy::~SoTextureScalePolicy () [protected], [virtual]


Member Function Documentation

SoType SoTextureScalePolicy::getClassTypeId (void) [static]

This static method returns the SoType object associated with objects of this class.

Reimplemented from SoNode.

SoType SoTextureScalePolicy::getTypeId (void) const [virtual]

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting.

Usage example:

  void foo(SoNode * node)
    if (node->getTypeId() == SoFile::getClassTypeId()) {
      SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.

Implements SoBase.

const SoFieldData ** SoTextureScalePolicy::getFieldDataPtr (void) [static], [protected]

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Reimplemented from SoNode.

const SoFieldData * SoTextureScalePolicy::getFieldData (void) const [protected], [virtual]

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoFieldContainer.

void SoTextureScalePolicy::initClass (void) [static]

Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

Reimplemented from SoNode.

void SoTextureScalePolicy::GLRender (SoGLRenderAction *action) [virtual]

Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method.

Reimplemented from SoNode.

Member Data Documentation

SoSFEnum SoTextureScalePolicy::policy

The policy setting. Default value is USE_TEXTURE_QUALITY.

USE_TEXTURE_QUALITY means that SoComplexity::textureQuality will be used to decide if the texture should be scaled up or down. SoComplexity::textureQuality >= 0.7 means scale up, while < 0.7 means scale down. Textures smaller than 256 pixels are never scaled down since you lose too much information.

SoSFFloat SoTextureScalePolicy::quality

The texture scale/resize quality. Default value is 0.5.

This field can be used to force Coin to use a lower quality (but much faster) image resize function. Currently, if you set this field to a value < 0.5, a low quality resize function will be used, otherwise a high quality (but slow) function will be used.


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