SoVertexAttribute(3)

NAME
SoVertexAttribute - A generic node for providing GL vertex attributes of various types.

SYNOPSIS

#include <Inventor/nodes/SoVertexAttribute.h>

Inherits SoNode.

Inherited by SoAnyVertexAttribute< Type >.

  Public Member Functions
virtual SoType getTypeId (void) const
SoMField * getValuesField (void) const
virtual void doAction (SoAction *action)
virtual void GLRender (SoGLRenderAction *action)
virtual void write (SoWriteAction *action)
virtual void copyContents (const SoFieldContainer *from, SbBool copyconnections)
virtual void notify (SoNotList *l)

  Static Public Member Functions
static void initClass (void)
static SoType getClassTypeId (void)

  Public Attributes
SoSFName name
SoSFName typeName

  Protected Member Functions
virtual SbBool readInstance (SoInput *in, unsigned short flags)

  Additional Inherited Members

Detailed Description

A generic node for providing GL vertex attributes of various types. The SoVertexAttribute nodes is used with the SoShaderProgram node to send vertex attributes to the vertex shader.

  #Inventor V2.1 ascii
  Separator {
     ShaderProgram {
        shaderObject [
                      VertexShader {
                         sourceProgram "vertex.glsl"
                      }
                   ]
     }
     Coordinate3 {
        point [ 0 0 0, 1 0 0, 1 1 0 ]
     }
     VertexAttribute {
        typeName "SoMFVec3f"
        name "color"
        values [ 1.0 0.0 0.0,
                 0.0 1.0 0.0,
                 0.0 0.0 1.0 ]
     }
     IndexedFaceSet {
        coordIndex [ 0, 1, 2, -1 ]
     }
  }.fi

The vertex shader (vertex.glsl)

attribute vec3 color;
void main(void)
{
  gl_Position = ftransform();
  gl_FrontColor = vec4(color, 1.0);
}

See also:
    SoVertexAttributeBinding

Be aware that this class is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.

Since:
    Coin 3.0

Member Function Documentation

  SoType SoVertexAttribute::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.

  void SoVertexAttribute::doAction (SoAction * action) [virtual]
This function performs the typical operation of a node for any action.

Reimplemented from SoNode.

  void SoVertexAttribute::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 SoVertexAttribute::write (SoWriteAction * action) [virtual]
Action method for SoWriteAction.

Writes out a node object, and any connected nodes, engines etc, if necessary.

Reimplemented from SoNode.

  void SoVertexAttribute::copyContents (const SoFieldContainer * from, SbBool copyconnections) [virtual]
Makes a deep copy of all data of from into this instance, except external scenegraph references if copyconnections is FALSE.

This is the protected method that should be overridden by extension node / engine / dragger / whatever subclasses which needs to account for internal data that are not handled automatically.

For copying nodes from application code, you should not invoke this function directly, but rather call the SoNode::copy() function:

SoNode * mynewnode = templatenode->copy();

The same also goes for engines.

Make sure that when you override the copyContents() method in your extension class that you also make it call upwards to it's parent superclass in the inheritance hierarchy, as copyContents() in for instance SoNode and SoFieldContainer does important work. It should go something like this:

void
MyCoinExtensionNode::copyContents(const SoFieldContainer * from,
                                  SbBool copyconnections)
{
  // let parent superclasses do their thing (copy fields, copy
  // instance name, etc etc)
  SoNode::copyContents(from, copyconnections);
  // [..then copy internal data..]
}

Reimplemented from SoNode.

  void SoVertexAttribute::notify (SoNotList * l) [virtual]
Notifies all auditors for this instance when changes are made.

Reimplemented from SoNode.

  SbBool SoVertexAttribute::readInstance (SoInput * in, unsigned short flags) [protected], [virtual]
This method is mainly intended for internal use during file import operations.

It reads a definition of an instance from the input stream in. The input stream state points to the start of a serialized / persistant representation of an instance of this class type.

TRUE or FALSE is returned, depending on if the instantiation and configuration of the new object of this class type went ok or not. The import process should be robust and handle corrupted input streams by returning FALSE.

flags is used internally during binary import when reading user extension nodes, group nodes or engines.

Reimplemented from SoNode.

Author

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