SoGeometryShader(3) The SoGeometryShader class is used for loading geometry shader programs.


#include <Inventor/nodes/SoGeometryShader.h>

Inherits SoShaderObject.

Public Types



Public Member Functions

virtual SoType getTypeId (void) const

SoGeometryShader (void)

virtual ~SoGeometryShader ()

virtual void GLRender (SoGLRenderAction *action)

Static Public Member Functions

static SoType getClassTypeId (void)

static void initClass (void)

static SbBool isSupported (SourceType sourceType)

Public Attributes

SoSFEnum inputType

SoSFEnum outputType

SoSFInt32 maxEmit

Protected Member Functions

virtual const SoFieldData * getFieldData (void) const

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

Detailed Description

The SoGeometryShader class is used for loading geometry shader programs.

See Shaders in Coin for more information on how to set up a scene graph with shaders.


    GeometryShader {
      isActive TRUE
      sourceType FILENAME
      sourceProgram ''
      parameter []
      inputType TRIANGLES_IN
      outputType TRIANGLE_STRIP_OUT
      maxEmit 8

See also:




Coin 2.5

Member Enumeration Documentation

enum SoGeometryShader::InputType

Enumerates the input types.


Shader uses points as input.
Shader uses lines as input.
Shader uses triangles as input. OpenGL will automatically convert quads and polygons into triangles.

enum SoGeometryShader::OutputType

Enumerates the output types.


Shader generates points.
Shader generates line strips.

Constructor & Destructor Documentation

SoGeometryShader::SoGeometryShader (void)


SoGeometryShader::~SoGeometryShader () [virtual]


Member Function Documentation

SoType SoGeometryShader::getClassTypeId (void) [static]

This static method returns the SoType object associated with objects of this class.

Reimplemented from SoShaderObject.

SoType SoGeometryShader::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.

Reimplemented from SoShaderObject.

const SoFieldData ** SoGeometryShader::getFieldDataPtr (void) [static], [protected]

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Reimplemented from SoShaderObject.

const SoFieldData * SoGeometryShader::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.

Reimplemented from SoShaderObject.

void SoGeometryShader::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 SoShaderObject.

void SoGeometryShader::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 SoShaderObject.

SbBool SoGeometryShader::isSupported (SourceTypesourceType) [static]

Returns a boolean indicating whether the requested source type is supported by the OpenGL driver or not.

Beware: To get a correct answer, a valid OpenGL context must be available.

Member Data Documentation

SoSFEnum SoGeometryShader::inputType

The type of geometry used as input to the shader. Default value is TRIANGLES_IN.

SoSFEnum SoGeometryShader::outputType

The type of geometry generated from the shader. Default value is TRIANGLE_FAN_OUT.

SoSFInt32 SoGeometryShader::maxEmit

The maximum number of vertices emitted from the shader. Default value is 8. This corresponds to the GL_GEOMETRY_VERTICES_OUT_EXT enum.


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