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Coin
4.0.3
Coin3D core library
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Coin
4.0.3
Coin3D core library
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The SoTextureScalePolicy class is a node for controlling the texture scale policy. More...
#include <Inventor/nodes/SoTextureScalePolicy.h>
Public Types | |
| enum | Policy { USE_TEXTURE_QUALITY , SCALE_DOWN , SCALE_UP , FRACTURE } |
 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 , COIN_3_0 = 0x8000 , INVENTOR_6_0 = 0x10000 , COIN_4_0 = 0x20000 } |
Static Public Member Functions | |
| static SoType | getClassTypeId (void) |
| static void | initClass (void) |
| Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system. | |
| Static Public Member Functions inherited from SoNode | |
| static void | audioRenderS (SoAction *action, SoNode *node) |
| static void | callbackS (SoAction *action, SoNode *node) |
| static int | getActionMethodIndex (const SoType type) |
| static void | getBoundingBoxS (SoAction *action, SoNode *node) |
| static SoNode * | getByName (const SbName &name) |
| static int | getByName (const SbName &name, SoNodeList &l) |
| static SoType | getClassTypeId (void) |
| static uint32_t | getCompatibilityTypes (const SoType &nodetype) |
| static void | getMatrixS (SoAction *action, SoNode *node) |
| static SbUniqueId | getNextNodeId (void) |
| static void | getPrimitiveCountS (SoAction *action, SoNode *node) |
| static void | GLRenderS (SoAction *action, SoNode *node) |
| static void | handleEventS (SoAction *action, SoNode *node) |
| static void | initClass (void) |
| Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system. | |
| static void | initClasses (void) |
| 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 Public Member Functions inherited from SoFieldContainer | |
| static void | addCopy (const SoFieldContainer *orig, const SoFieldContainer *copy) |
| static SoFieldContainer * | checkCopy (const SoFieldContainer *orig) |
| static void | cleanupClass (void) |
| static void | copyDone (void) |
| static SoFieldContainer * | findCopy (const SoFieldContainer *orig, const SbBool copyconnections) |
| static SoType | getClassTypeId (void) |
| This static method returns the SoType object associated with objects of this class. | |
| static void | initClass (void) |
| Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system. | |
| static void | initCopyDict (void) |
| Static Public Member Functions inherited from SoBase | |
| static void | addName (SoBase *const base, const char *const name) |
| static SbBool | connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname) |
| static void | decrementCurrentWriteCounter (void) |
| static SoType | getClassTypeId (void) |
| This static method returns the SoType object associated with objects of this class. | |
| static SoBase * | getNamedBase (const SbName &name, SoType type) |
| static int | getNamedBases (const SbName &name, SoBaseList &baselist, SoType type) |
| static SbBool | getTraceRefs (void) |
| static void | incrementCurrentWriteCounter (void) |
| static void | initClass (void) |
| Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system. | |
| static SbBool | read (SoInput *input, SoBase *&base, SoType expectedtype) |
| static SbBool | readRoute (SoInput *input) |
| static void | removeName (SoBase *const base, const char *const name) |
| static void | setInstancePrefix (const SbString &c) |
| static void | setTraceRefs (SbBool trace) |
Public Attributes | |
| SoSFEnum | policy |
| SoSFFloat | quality |
Protected Member Functions | |
| virtual | ~SoTextureScalePolicy () |
| virtual const SoFieldData * | getFieldData (void) const |
| 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) | |
| virtual | ~SoFieldContainer () |
| Protected Member Functions inherited from SoBase | |
| SoBase (void) | |
| virtual | ~SoBase () |
| virtual SoNotRec | createNotRec (void) |
| virtual void | destroy (void) |
| virtual const char * | getFileFormatName (void) const |
| SbBool | hasMultipleWriteRefs (void) const |
| void | writeFooter (SoOutput *out) const |
| SbBool | writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine) const |
Static Protected Member Functions | |
| static const SoFieldData ** | getFieldDataPtr (void) |
| Static Protected Member Functions inherited from SoNode | |
| static const SoFieldData ** | getFieldDataPtr (void) |
| static int | getNextActionMethodIndex (void) |
| static void | incNextActionMethodIndex (void) |
| static void | setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask) |
| static void | setNextActionMethodIndex (int index) |
| 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 | |
| SbUniqueId | uniqueId |
| Protected Attributes inherited from SoFieldContainer | |
| SbBool | isBuiltIn |
| Static Protected Attributes inherited from SoNode | |
| static int | nextActionMethodIndex = 0 |
| static SbUniqueId | nextUniqueId = 1 |
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 they are 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 libraries 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 gray
}
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.
FILE FORMAT/DEFAULTS:
Enumerates the available policy settings.
| SoTextureScalePolicy::SoTextureScalePolicy | ( | void | ) |
Constructor.
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protectedvirtual |
Destructor.
This static method returns the SoType object associated with objects of this class.
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protectedvirtual |
Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.
Reimplemented from SoFieldContainer.
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staticprotected |
This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.
Returns the SoFieldData class which holds information about fields in this node.
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virtual |
Action method for the SoGLRenderAction.
This is called during rendering traversals. Nodes influencing the rendering state in any way or want to throw geometry primitives at OpenGL override this method.
Reimplemented from SoNode.
| 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.
1.10.0