SoTextureCombine Class Reference

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SoTextureCombine Class Reference
Node Classes

The SoTextureCombine class is a node for setting texture combine functions.This node is more or less an exact mapping of the OpenGL ARB_texture_env_combine extension (included in OpenGL in OpenGL v1.3). See http://oss.sgi.com/projects/ogl-sample/registry/ARB/texture_env_combine.txt for more information about this extension. More...

`#include <Inventor/nodes/SoTextureCombine.h>`

Inheritance diagram for SoTextureCombine:

## Public Types
enum | Source { PRIMARY_COLOR = SoTextureCombineElement::PRIMARY_COLOR, TEXTURE = SoTextureCombineElement::TEXTURE, CONSTANT = SoTextureCombineElement::CONSTANT, PREVIOUS = SoTextureCombineElement::PREVIOUS }
enum | Operand { SRC_COLOR = SoTextureCombineElement::SRC_COLOR, ONE_MINUS_SRC_COLOR = SoTextureCombineElement::ONE_MINUS_SRC_COLOR, SRC_ALPHA = SoTextureCombineElement::SRC_ALPHA, ONE_MINUS_SRC_ALPHA = SoTextureCombineElement::ONE_MINUS_SRC_ALPHA }
enum | Operation { REPLACE = SoTextureCombineElement::REPLACE, MODULATE = SoTextureCombineElement::MODULATE, ADD = SoTextureCombineElement::ADD, ADD_SIGNED = SoTextureCombineElement::ADD_SIGNED, SUBTRACT = SoTextureCombineElement::SUBTRACT, INTERPOLATE = SoTextureCombineElement::INTERPOLATE, DOT3_RGB = SoTextureCombineElement::DOT3_RGB, DOT3_RGBA = SoTextureCombineElement::DOT3_RGBA }
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 }

## Public Member Functions
virtual SoType | getTypeId (void) const
| SoTextureCombine (void)
virtual void | doAction (SoAction *action)
virtual void | callback (SoCallbackAction *action)
virtual void | GLRender (SoGLRenderAction *action)
virtual void | pick (SoPickAction *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=FALSE) const
virtual SbBool | affectsState (void) const
virtual void | GLRenderBelowPath (SoGLRenderAction *action)
virtual void | GLRenderInPath (SoGLRenderAction *action)
virtual void | GLRenderOffPath (SoGLRenderAction *action)
virtual void | getBoundingBox (SoGetBoundingBoxAction *action)
virtual void | getMatrix (SoGetMatrixAction *action)
virtual void | handleEvent (SoHandleEventAction *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=FALSE)
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 *input)
void | get (SbString &fielddata, SoOutput *out)
virtual SbBool | validateNewFieldValue (SoField *field, void *newval)
virtual void | addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)
SbBool | getIsBuiltIn (void) const
virtual void | getFieldsMemorySize (size_t &managed, size_t &unmanaged) 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 | cleanupClass (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 *input, SoBase *&base, SoType expectedtype)
static void | setInstancePrefix (const SbString &c)
static void | setTraceRefs (SbBool trace)
static SbBool | getTraceRefs (void)
static SbBool | connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname)
static SbBool | readRoute (SoInput *input)

## Public Attributes
SoMFEnum | rgbSource
SoMFEnum | alphaSource
SoMFEnum | rgbOperand
SoMFEnum | alphaOperand
SoSFEnum | rgbOperation
SoSFEnum | alphaOperation
SoSFFloat | rgbScale
SoSFFloat | alphaScale
SoSFVec4f | constantColor

## Protected Member Functions
virtual const SoFieldData * | getFieldData (void) const
virtual | ~SoTextureCombine ()
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 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 = 1
static int | nextActionMethodIndex = 0

## Detailed Description

The SoTextureCombine class is a node for setting texture combine functions.

This node is more or less an exact mapping of the OpenGL ARB_texture_env_combine extension (included in OpenGL in OpenGL v1.3). See http://oss.sgi.com/projects/ogl-sample/registry/ARB/texture_env_combine.txt for more information about this extension.

Basically this node lets you specify up to three sources, and a function to combine those sources. In addition to the function, it's possible to apply simple operands on the sources. In the documentation below, the sources will be called Arg0, Arg1, and Arg2, just like in the ARB_texture_env_mode specification.

It's possible to specify both a color and an alpha operation.

This node has many fields, but usually it is sufficient to set only one or very few fields. The selected operation decides which values you need to set. One common example is to add a light map to textured geometry. A lightmap can look like this:

The example below just shows how to apply the lightmap to a cube, with one light source on each side of the cube. Usually the texture coordinates are calculated so that a spot light or a point light is simulated.

    Texture2 { filename "wood.jpg" }

    Switch {
      whichChild -3   # use to toggle lightmap on/off
      TextureUnit {
        unit 1
      }
      TextureCombine {
        rgbOperation ADD_SIGNED
        rgbSource [PREVIOUS, TEXTURE]
        rgbOperand [SRC_COLOR, SRC_COLOR ]
        alphaOperation REPLACE
        alphaSource [TEXTURE]
        alphaOperand [SRC_ALPHA]
      }
      Texture2 { filename "lightmap.jpg" }
      TextureUnit { unit 0 }
    }
    Cube { }

The scene above in a viewer:

In addition to the functions you can set in rgbOperation (or alphaOperation), it's possible to create more complex texture functions by combining two textures that have already been combined. You can use the SoSceneTexture2 node to create those textures. Below is an example that shows how to implement Arg0*Arg1

- Arg2*Arg0, where Arg0 = texture1 RGB, Arg1 = texture2 RGB, Arg2 = texture 2 alpha:

    ShapeHints { vertexOrdering COUNTERCLOCKWISE shapeType SOLID }

    Separator {
      SceneTexture2 {
        size 256 256
        transparencyFunction NONE
        scene Separator {
          OrthographicCamera {
            height 2
            aspectRatio 1
            position 0 0 1
            viewportMapping LEAVE_ALONE
          }
          LightModel { model BASE_COLOR }
          Coordinate3 {
            point [ -1 -1 0, 1 -1 0, 1 1 0, -1 1 0 ]
          }
          DEF texture1 Texture2 { filename "texture1.png" }
          TextureUnit { unit 1 }
          TextureCombine {
            rgbOperation MODULATE
            rgbSource [ PREVIOUS, TEXTURE ]
            rgbOperand [ SRC_COLOR, SRC_COLOR ]
            alphaOperation REPLACE
            alphaSource [TEXTURE]
            alphaOperand [ SRC_ALPHA ]
          }
          DEF texture2 Texture2 { filename "texture2_with_alpha.png" }
          TextureCoordinate2 {
            point [0 0, 1 0, 1 1, 0 1]
          }
          FaceSet { numVertices 4 }
        }
      }
      TextureUnit { unit 1 }
      TextureCombine {
        rgbOperation ADD
        rgbSource [ PREVIOUS, TEXTURE ]
        rgbOperand [ SRC_COLOR, SRC_COLOR ]
        alphaOperation REPLACE
        alphaSource [TEXTURE]
        alphaOperand [ SRC_ALPHA ]
      }
      SceneTexture2 {
        size 256 256
        transparencyFunction NONE
        scene Separator {
          OrthographicCamera {
            height 2
            aspectRatio 1
            position 0 0 1
            viewportMapping LEAVE_ALONE
          }
          LightModel { model BASE_COLOR }
          Coordinate3 {
            point [ -1 -1 0, 1 -1 0, 1 1 0, -1 1 0 ]
          }
          USE texture1
          TextureUnit { unit 1 }
          TextureCombine {
            rgbOperation MODULATE
            rgbSource [ PREVIOUS, TEXTURE ]
            rgbOperand [ SRC_COLOR, SRC_ALPHA ]
            alphaOperation REPLACE
            alphaSource [TEXTURE]
            alphaOperand [ SRC_ALPHA ]
          }
          USE texture2
          TextureCoordinate2 {
            point [0 0, 1 0, 1 1, 0 1]
          }
          FaceSet { numVertices 4 }
        }
      }
      # map resulting texture onto a Cube
      Cube { }
    }

It should be possible to create almost any kind of texture function using this scheme, at the cost of extra texture memory usage (the intermediate textures), of course.

FILE FORMAT/DEFAULTS:

TextureCombine {
rgbSource [ ]
alphaSource [ ]
rgbOperand [ ]
alphaOperand [ ]
rgbOperation MODULATE
alphaOperation MODULATE
rgbScale 1
alphaScale 1
constantColor 1 1 1 1
}

Since
  Coin 2.3

## Member Enumeration Documentation

enum SoTextureCombine::Source

For enumerating combiner sources.

Enumerator
PRIMARY_COLOR | Choose primary color as source.
TEXTURE | Choose texture as source.
CONSTANT | Choose the constantColor field as source.
PREVIOUS | Choose the previous unit's texture as source.

enum SoTextureCombine::Operand

For enumerating source operands.

Enumerator
SRC_COLOR | Use the source color as operand.
ONE_MINUS_SRC_COLOR | Use one minus source color as operand.
SRC_ALPHA | Use the source alpha as operand.
ONE_MINUS_SRC_ALPHA | Use one minus source alpha as operand.

enum SoTextureCombine::Operation

For enumerating combiner operations/functions.

Enumerator
REPLACE | dst = Arg0
MODULATE | dst = Arg0 * Arg1
ADD | dst = Arg0 + Arg1
ADD_SIGNED | dst = Arg0 + Arg1 - 0.5
SUBTRACT | dst = Arg0 - Arg1
INTERPOLATE | dst = Arg0 * (Arg2) + Arg1 * (1-Arg2)
DOT3_RGB | Dot product of Arg0 and Arg1
DOT3_RGBA | Dot product (including alpha) of Arg0 and Arg1

## Constructor & Destructor Documentation

SoTextureCombine::SoTextureCombine | ( | void |  | ) |

Constructor.

SoTextureCombine::~SoTextureCombine | ( |  | ) |
| protectedvirtual

Destructor.

## Member Function Documentation

SoType SoTextureCombine::getClassTypeId | ( | void |  | ) |
| static

SoTextureCombine::rgbSource

The color sources. This field is empty by default, but you can insert up to three values [Arg0, Arg1, Arg2]. When the field contains less than three values, the default [TEXTURE, PREVIOUS, CONSTANT], will be used for missing values.

For texture unit 0, PREVIOUS maps to PRIMARY_COLOR,

SoTextureCombine::alphaSource

The alpha sources. This field is empty by default, but you can insert up to three values [Arg0, Arg1, Arg2]. When the field contains less than three values, the default [TEXTURE, PREVIOUS, CONSTANT], will be used for missing values.

For texture unit 0, PREVIOUS maps to PRIMARY_COLOR,

SoTextureCombine::rgbOperand

The color operands. This field is empty by default, but you can insert up to three values. When the field contains less than three values, the default [SRC_COLOR, SRC_COLOR, SRC_COLOR] will be used for missing values.

SoTextureCombine::alphaOperand

The alpha operands. This field is empty by default, but you can insert up to three values. When the field contains less than three values, the default [SRC_ALPHA, SRC_ALPHA, SRC_ALPHA] will be used for missing values. Please not that only SRC_ALPHA and ONE_MINUS_SRC_ALPHA are valid operands for alpha operations.

SoTextureCombine::rgbOperation

The color operation. Default value is MODULATE.

SoTextureCombine::alphaOperation

The alpha operation. Default value is MODULATE.

SoTextureCombine::rgbScale

Scale color result by this value. Supported values are 1, 2, and 4.

SoTextureCombine::alphaScale

Scale alpha result by this value. Supported values are 1, 2, and 4.

SoTextureCombine::constantColor

The constant color (when CONSTANT is used as source). Default value is (1,1,1,1).

SoType SoTextureCombine::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 * SoTextureCombine::getFieldData | ( | void |  | ) | const
| 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.

void SoTextureCombine::doAction | ( | SoAction * | action | ) |
| virtual

This function performs the typical operation of a node for any action.

Reimplemented from SoNode.

void SoTextureCombine::callback | ( | SoCallbackAction * | action | ) |
| virtual

Action method for SoCallbackAction.

Simply updates the state according to how the node behaves for the render action, so the application programmer can use the SoCallbackAction for extracting information about the scene graph.

Reimplemented from SoNode.

void SoTextureCombine::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.

void SoTextureCombine::pick | ( | SoPickAction * | action | ) |
| virtual

Action method for SoPickAction.

Does common processing for SoPickAction action instances.

Reimplemented from SoNode.

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

- SoTextureCombine.h
- SoTextureCombine.cpp

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