SoTextureScalePolicy(3)

💅 SoTextureScalePolicy 💅

okay bestie, come sit with me, we're doing the SoTextureScalePolicy(3) page and it's a long one so buckle up 🎀

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🌸 NAME 🌸

SoTextureScalePolicy — the SoTextureScalePolicy class is a node for controlling the texture scale policy. that's the whole vibe. a node. it controls the texture scale policy. iconic behaviour honestly 💖

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✨ SYNOPSIS ✨

#include <Inventor/nodes/SoTextureScalePolicy.h>

Inherits SoNode.

🫶 Public Types

enum Policy { USE_TEXTURE_QUALITY, SCALE_DOWN, SCALE_UP, FRACTURE }

four whole moods to pick from, no cap 🦋

Public Types inherited from SoNode:

enum NodeType { INVENTOR = 0x0000, VRML1 = 0x0001, VRML2 = 0x0002,
    INVENTOR_1 = 0x0004, INVENTOR_2_0 = 0x0008, INVENTOR_2_1 = 0x0010,
    INVENTOR_2_5 = 0x0020, INVENTOR_2_6 = 0x0040, COIN_1_0 = 0x0080,
    COIN_2_0 = 0x0100, EXTENSION = 0x0200, COIN_2_2 = 0x0400, COIN_2_3 =
    0x0800, COIN_2_4 = 0x1000, INVENTOR_5_0 = 0x2000, COIN_2_5 = 0x4000
    }

🌈 Public Member Functions

virtual SoType getTypeId (void) const
SoTextureScalePolicy (void)
virtual void GLRender (SoGLRenderAction *action)

Public Member Functions inherited from SoNode:

void setOverride (const SbBool state)
SbBool isOverride (void) const
void setNodeType (const NodeType type)
NodeType getNodeType (void) const
virtual SoNode * copy (SbBool copyconnections=0) const
virtual SbBool affectsState (void) const
virtual void doAction (SoAction *action)
virtual void GLRenderBelowPath (SoGLRenderAction *action)
virtual void GLRenderInPath (SoGLRenderAction *action)
virtual void GLRenderOffPath (SoGLRenderAction *action)
virtual void callback (SoCallbackAction *action)
virtual void getBoundingBox (SoGetBoundingBoxAction *action)
virtual void getMatrix (SoGetMatrixAction *action)
virtual void handleEvent (SoHandleEventAction *action)
virtual void pick (SoPickAction *action)
virtual void rayPick (SoRayPickAction *action)
virtual void search (SoSearchAction *action)
virtual void write (SoWriteAction *action)
virtual void audioRender (SoAudioRenderAction *action)
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
virtual void grabEventsSetup (void)
virtual void grabEventsCleanup (void)
virtual void startNotify (void)
virtual void notify (SoNotList *l)
uint32_t getNodeId (void) const
virtual SoChildList * getChildren (void) const
virtual void writeInstance (SoOutput *out)
virtual SoNode * addToCopyDict (void) const
virtual void copyContents (const SoFieldContainer *from, SbBool
    copyconnections)
virtual SoFieldContainer * copyThroughConnection (void) const

Public Member Functions inherited from SoFieldContainer:

void setToDefaults (void)
SbBool hasDefaultValues (void) const
SbBool fieldsAreEqual (const SoFieldContainer *container) const
void copyFieldValues (const SoFieldContainer *container, SbBool
    copyconnections=0)
SbBool set (const char *const fielddata)
void get (SbString &fielddata)
virtual int getFields (SoFieldList &l) const
virtual int getAllFields (SoFieldList &l) const
virtual SoField * getField (const SbName &name) const
virtual SoField * getEventIn (const SbName &name) const
virtual SoField * getEventOut (const SbName &name) const
SbBool getFieldName (const SoField *const field, SbName &name) const
SbBool enableNotify (const SbBool flag)
SbBool isNotifyEnabled (void) const
SbBool set (const char *fielddata, SoInput *in)
void get (SbString &fielddata, SoOutput *out)
virtual SbBool validateNewFieldValue (SoField *field, void *newval)
virtual void addWriteReference (SoOutput *out, SbBool isfromfield=0)
SbBool getIsBuiltIn (void) const
void setUserData (void *userdata) const
void * getUserData (void) const

Public Member Functions inherited from SoBase:

void ref (void) const
void unref (void) const
void unrefNoDelete (void) const
int32_t getRefCount (void) const
void touch (void)
SbBool isOfType (SoType type) const
virtual SbName getName (void) const
virtual void setName (const SbName &newname)
void addAuditor (void *const auditor, const SoNotRec::Type type)
void removeAuditor (void *const auditor, const SoNotRec::Type type)
const SoAuditorList & getAuditors (void) const
SbBool shouldWrite (void)
void assertAlive (void) const

⭐ Static Public Member Functions

static SoType getClassTypeId (void)
static void initClass (void)

Static Public Member Functions inherited from SoNode:

static uint32_t getCompatibilityTypes (const SoType &nodetype)
static SoType getClassTypeId (void)
static SoNode * getByName (const SbName &name)
static int getByName (const SbName &name, SoNodeList &l)
static void initClass (void)
static void initClasses (void)
static uint32_t getNextNodeId (void)
static int getActionMethodIndex (const SoType type)
static void getBoundingBoxS (SoAction *action, SoNode *node)
static void GLRenderS (SoAction *action, SoNode *node)
static void callbackS (SoAction *action, SoNode *node)
static void getMatrixS (SoAction *action, SoNode *node)
static void handleEventS (SoAction *action, SoNode *node)
static void pickS (SoAction *action, SoNode *node)
static void rayPickS (SoAction *action, SoNode *node)
static void searchS (SoAction *action, SoNode *node)
static void writeS (SoAction *action, SoNode *node)
static void audioRenderS (SoAction *action, SoNode *node)
static void getPrimitiveCountS (SoAction *action, SoNode *node)

Static Public Member Functions inherited from SoFieldContainer:

static void initClass (void)
static SoType getClassTypeId (void)
static void initCopyDict (void)
static void addCopy (const SoFieldContainer *orig, const
    SoFieldContainer *copy)
static SoFieldContainer * checkCopy (const SoFieldContainer *orig)
static SoFieldContainer * findCopy (const SoFieldContainer *orig, const
    SbBool copyconnections)
static void copyDone (void)

Static Public Member Functions inherited from SoBase:

static void initClass (void)
static SoType getClassTypeId (void)
static void addName (SoBase *const base, const char *const name)
static void removeName (SoBase *const base, const char *const name)
static void incrementCurrentWriteCounter (void)
static void decrementCurrentWriteCounter (void)
static SoBase * getNamedBase (const SbName &name, SoType type)
static int getNamedBases (const SbName &name, SoBaseList &baselist,
    SoType type)
static SbBool read (SoInput *in, SoBase *&base, SoType expectedtype)
static void setInstancePrefix (const SbString &c)
static void setTraceRefs (SbBool trace)
static SbBool getTraceRefs (void)
static SbBool connectRoute (SoInput *in, const SbName &fromnodename,
    const SbName &fromfieldname, const SbName &tonodename, const SbName
    &tofieldname)
static SbBool readRoute (SoInput *in)

💜 Public Attributes

SoSFEnum policy
SoSFFloat quality

two lil public fields, just hanging out, being public 🍓

🧚 Protected Member Functions

virtual const SoFieldData * getFieldData (void) const
virtual ~SoTextureScalePolicy ()

Protected Member Functions inherited from SoNode:

SoNode (void)
virtual ~SoNode ()
virtual SbBool readInstance (SoInput *in, unsigned short flags)

Protected Member Functions inherited from SoFieldContainer:

SoFieldContainer (void)
~SoFieldContainer ()

Protected Member Functions inherited from SoBase:

SoBase (void)
virtual ~SoBase ()
virtual void destroy (void)
SbBool hasMultipleWriteRefs (void) const
SbBool writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine)
    const
void writeFooter (SoOutput *out) const
virtual const char * getFileFormatName (void) const

🌟 Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

Static Protected Member Functions inherited from SoNode:

static const SoFieldData ** getFieldDataPtr (void)
static void setNextActionMethodIndex (int index)
static int getNextActionMethodIndex (void)
static void incNextActionMethodIndex (void)
static void setCompatibilityTypes (const SoType &nodetype, const
    uint32_t bitmask)

Static Protected Member Functions inherited from SoBase:

static uint32_t getCurrentWriteCounter (void)
static void staticDataLock (void)
static void staticDataUnlock (void)

🎀 Additional Inherited Members

Protected Types inherited from SoBase:

enum BaseFlags { IS_ENGINE = 0x01, IS_GROUP = 0x02 }

Protected Attributes inherited from SoNode:

uint32_t uniqueId

Protected Attributes inherited from SoFieldContainer:

SbBool isBuiltIn

Static Protected Attributes inherited from SoNode:

static uint32_t nextUniqueId = 0
static int nextActionMethodIndex = 0

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okay pausing here bc there's more coming bestie, don't go anywhere 💖

✨ DETAILED DESCRIPTION ✨

okay bestie, so SoTextureScalePolicy is a whole node whose entire job is controlling the texture scale policy 💅 like it's the vibe manager for your textures, fr.

Here's the tea: if a texture map is of size != 2^n, it has to be scaled before OpenGL can even deal with it. This node is your little remote control for how and if textures get scaled before they get yeeted over to OpenGL 🫶.

Also, if a texture map is bigger than the maximum OpenGL texture size (and bestie, that's implementation and context dependent, so it varies), it will get scaled down to the max size. You can dodge that whole situation by setting the texture policy to SoTextureScalePolicy::FRACTURE, and then the texture gets split into several small subtextures before the geometry using the texture is rendered ✨ iconic behaviour honestly.

Setting SoTextureScalePolicy::policy to SoTextureScalePolicy::FRACTURE will also make the internal texture handling unit in Coin automatically downsample the individual subtextures, so it doesn't use more graphics card memory than necessary to cover the current screen size of the texture. Efficiency queen 👑.

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. That's it. That's the limit.

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 { }
}

⚠️ heads up bestie — 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. not me warning you about performance 😭

⚠️ also be aware that this class is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API. so don't go looking for it there, she's Coin-exclusive 💅

FILE FORMAT/DEFAULTS:

TextureScalePolicy {
    policy USE_TEXTURE_QUALITY
    quality 0.5
}

Since

Coin 2.0 — vintage era, but make it slay ✨

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🌸 MEMBER ENUMERATION DOCUMENTATION 🌸

enum SoTextureScalePolicy::Policy

Enumerates the available policy settings. The menu of options, if you will 🎀.

Enumerator

• USE_TEXTURE_QUALITY — Uses the texture quality to decide whether to scale up or down. let the quality field be the decider, she's got this.
• SCALE_DOWN — Always scales down. no thoughts, just shrink 🔽.
• SCALE_UP — Always scales up. bigger bigger bigger 🔼.
• FRACTURE — 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. the whole ✨ chaos-gremlin-but-make-it-efficient ✨ option.

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. fr fr, that's the only ceiling 🫶.

⚠️ Be aware that the rendering is quite slow with this mode if the texture(s) will be mapped onto lots of polygon primitives. she's powerful but she is NOT fast on heavy geometry, ngl.

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🦋 CONSTRUCTOR & DESTRUCTOR DOCUMENTATION 🦋

SoTextureScalePolicy::SoTextureScalePolicy (void )

Constructor. the birth of a node, honestly so main character 🎀

References FRACTURE, policy, quality, SCALE_DOWN, SCALE_UP, SoTextureScalePolicy(), and USE_TEXTURE_QUALITY.

Referenced by getFieldData(), and SoTextureScalePolicy().

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

Destructor. she's logging off bestie 💅

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💜 MEMBER FUNCTION DOCUMENTATION 💜

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. the classic "who dis really" check ✨.

Usage example:

void foo(SoNode * node)
{
  if (node->getTypeId() == SoFile::getClassTypeId()) {
    SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type
  }
  else if (node->getTypeId().isOfType(SoGroup::getClassTypeId())) {
    SoGroup * group = (SoGroup *)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. iykyk 🧚.

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::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. simple as that 🍓.

Reimplemented from SoFieldContainer.

References SoTextureScalePolicy().

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

Action method for the SoGLRenderAction. the actual render moment, the performance 💅.

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. yes she throws primitives at OpenGL, respectfully ✨.

Reimplemented from SoNode.

References SoAction::getState(), and quality.

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🌈 MEMBER DATA DOCUMENTATION 🌈

SoSFEnum SoTextureScalePolicy::policy

The policy setting. Default value is USE_TEXTURE_QUALITY. the factory setting, the neutral vibe 🎀.

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. respect the pixels bestie, they've been through enough 😭.

Referenced by SoTextureScalePolicy().

SoSFFloat SoTextureScalePolicy::quality

The texture scale/resize quality. Default value is 0.5. the "how much effort do you wanna put in" dial ✨.

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. pick your fighter: fast and rough, or slow and gorgeous 💅.

Referenced by GLRender(), and SoTextureScalePolicy().

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👑 AUTHOR 👑

Generated automatically by Doxygen for Coin from the source code. yes the docs wrote themselves, she's independent like that 💖.

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and that's the whole page bestie 🫶 — this one came from the Coin docs, Version 2.5.0, and it's the SoTextureScalePolicy(3) manpage, dated the same as always. go forth and fracture your textures responsibly, mwah 💅✨