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SoTextureCombine Class Reference

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:
SoNode SoFieldContainer SoBase

List of all members.

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
}

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 SoNodecopy (SbBool copyconnections=0) 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 SoChildListgetChildren (void) const
virtual void writeInstance (SoOutput *out)
virtual SoNodeaddToCopyDict (void) const
virtual void copyContents (const SoFieldContainer *from, SbBool copyconnections)
virtual SoFieldContainercopyThroughConnection (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 SoFieldgetField (const SbName &name) const
virtual SoFieldgetEventIn (const SbName &name) const
virtual SoFieldgetEventOut (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 SoAuditorListgetAuditors (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 SoNodegetByName (const SbName &name)
static int getByName (const SbName &name, SoNodeList &l)
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 initCopyDict (void)
static void addCopy (const SoFieldContainer *orig, const SoFieldContainer *copy)
static SoFieldContainercheckCopy (const SoFieldContainer *orig)
static SoFieldContainerfindCopy (const SoFieldContainer *orig, const SbBool copyconnections)
static void copyDone (void)
- Static Public Member Functions inherited from SoBase
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 SoBasegetNamedBase (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

SoMFEnum rgbSource
SoMFEnum alphaSource
SoMFEnum rgbOperand
SoMFEnum alphaOperand
SoSFEnum rgbOperation
SoSFEnum alphaOperation
SoSFFloat rgbScale
SoSFFloat alphaScale
SoSFVec4f constantColor

Protected Member Functions

virtual const SoFieldDatagetFieldData (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)
 ~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 void setNextActionMethodIndex (int index)
static int getNextActionMethodIndex (void)
static void incNextActionMethodIndex (void)
static void setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask)

Additional Inherited Members

- 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

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

  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

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.

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.

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  )
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).

Reimplemented from SoNode.

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
}
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.

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::getFieldDataPtr ( void  )
staticprotected

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

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

Reimplemented from SoNode.

References SoFieldContainer::get(), SoMField::getNum(), SoAction::getState(), SoMFEnum::getValues(), PREVIOUS, SoFieldContainer::set(), SRC_ALPHA, SRC_COLOR, and TEXTURE.

Referenced by GLRender().

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.

References SoNode::callback().

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.

References doAction(), DOT3_RGB, DOT3_RGBA, SoGLRenderAction::getCacheContext(), and SoDebugError::postWarning().

void SoTextureCombine::pick ( SoPickAction action)
virtual

Action method for SoPickAction.

Does common processing for SoPickAction action instances.

Reimplemented from SoNode.

References SoNode::pick().


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

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