#include <Tessellator>

Inheritance diagram for osgUtil::Tessellator:

Classes
struct	Prim
struct	Vec3d
struct	NewVertex

Public Types
enum	WindingType { TESS_WINDING_ODD = GLU_TESS_WINDING_ODD , TESS_WINDING_NONZERO = GLU_TESS_WINDING_NONZERO , TESS_WINDING_POSITIVE = GLU_TESS_WINDING_POSITIVE , TESS_WINDING_NEGATIVE = GLU_TESS_WINDING_NEGATIVE , TESS_WINDING_ABS_GEQ_TWO = GLU_TESS_WINDING_ABS_GEQ_TWO }
enum	TessellationType { TESS_TYPE_GEOMETRY , TESS_TYPE_DRAWABLE , TESS_TYPE_POLYGONS }
typedef std::vector< osg::ref_ptr< Prim > >	PrimList

Public Member Functions
	Tessellator ()
	~Tessellator ()
void	setBoundaryOnly (const bool tt)
bool	getBoundaryOnly ()
void	setWindingType (const WindingType wt)
WindingType	getWindingType ()
void	setTessellationType (const TessellationType tt)
TessellationType	getTessellationType ()
void	retessellatePolygons (osg::Geometry &cxgeom)
void	setTessellationNormal (const osg::Vec3 norm)
osg::Geometry::PrimitiveSetList	getContours ()
virtual void	beginTessellation ()
void	beginContour ()
void	addVertex (osg::Vec3 *vertex)
void	endContour ()
void	endTessellation ()
PrimList &	getPrimList ()
void	reset ()
Public Member Functions inherited from osg::Referenced
	Referenced ()
	Referenced (bool threadSafeRefUnref)
	Referenced (const Referenced &)
Referenced &	operator= (const Referenced &)
virtual void	setThreadSafeRefUnref (bool)
bool	getThreadSafeRefUnref () const
OpenThreads::Mutex *	getRefMutex () const
int	ref () const
int	unref () const
int	unref_nodelete () const
int	referenceCount () const
ObserverSet *	getObserverSet () const
ObserverSet *	getOrCreateObserverSet () const
void	addObserver (Observer *observer) const
void	removeObserver (Observer *observer) const

Protected Types
typedef std::map< osg::Vec3 *, unsigned int >	VertexPtrToIndexMap
typedef std::vector< NewVertex >	NewVertexList
typedef std::vector< Vec3d * >	Vec3dList

Protected Member Functions
void	reduceArray (osg::Array *cold, const unsigned int nnu)
void	collectTessellation (osg::Geometry &cxgeom, unsigned int originalIndex)
void	addContour (GLenum mode, unsigned int first, unsigned int last, osg::Vec3Array *vertices)
void	addContour (osg::PrimitiveSet primitive, osg::Vec3Array vertices)
void	handleNewVertices (osg::Geometry &geom, VertexPtrToIndexMap &vertexPtrToIndexMap)
void	begin (GLenum mode)
void	vertex (osg::Vec3 *vertex)
void	combine (osg::Vec3 vertex, void vertex_data[4], GLfloat weight[4])
void	end ()
void	error (GLenum errorCode)
Protected Member Functions inherited from osg::Referenced
virtual	~Referenced ()
void	signalObserversAndDelete (bool signalDelete, bool doDelete) const
void	deleteUsingDeleteHandler () const

Static Protected Member Functions
static void CALLBACK	beginCallback (GLenum which, void *userData)
static void CALLBACK	vertexCallback (GLvoid data, void userData)
static void CALLBACK	combineCallback (GLdouble coords[3], void vertex_data[4], GLfloat weight[4], void outData, void useData)
static void CALLBACK	endCallback (void *userData)
static void CALLBACK	errorCallback (GLenum errorCode, void *userData)

Protected Attributes
osg::GLUtesselator *	_tobj
PrimList	_primList
Vec3dList	_coordData
NewVertexList	_newVertexList
GLenum	_errorCode
WindingType	_wtype
TessellationType	_ttype
bool	_boundaryOnly
unsigned int	_numberVerts
osg::Geometry::PrimitiveSetList	_Contours
unsigned int	_index
osg::Vec3	tessNormal
unsigned int	_extraPrimitives
Protected Attributes inherited from osg::Referenced
OpenThreads::AtomicPtr	_observerSet
OpenThreads::Atomic	_refCount

Additional Inherited Members
Static Public Member Functions inherited from osg::Referenced
static OpenThreads::Mutex *	getGlobalReferencedMutex ()
static void	setDeleteHandler (DeleteHandler *handler)
static DeleteHandler *	getDeleteHandler ()

Detailed Description

Originally a simple class for tessellating a single polygon boundary. Using old style glu tessellation functions for portability. Upgraded Jan 2004 to use the modern glu tessellation functions.

Member Typedef Documentation

◆ NewVertexList

typedef std::vector<NewVertex> osgUtil::Tessellator::NewVertexList

protected

◆ PrimList

typedef std::vector< osg::ref_ptr<Prim> > osgUtil::Tessellator::PrimList

◆ Vec3dList

typedef std::vector<Vec3d*> osgUtil::Tessellator::Vec3dList

protected

◆ VertexPtrToIndexMap

typedef std::map<osg::Vec3*,unsigned int> osgUtil::Tessellator::VertexPtrToIndexMap

protected

Member Enumeration Documentation

◆ TessellationType

enum osgUtil::Tessellator::TessellationType

we interpret all contours in the geometry as a single set to be tessellated or each separate drawable's contours needs to be tessellated.

Enumerator
TESS_TYPE_GEOMETRY
TESS_TYPE_DRAWABLE
TESS_TYPE_POLYGONS

◆ WindingType

enum osgUtil::Tessellator::WindingType

The winding rule, see red book ch 11.

Enumerator
TESS_WINDING_ODD
TESS_WINDING_NONZERO
TESS_WINDING_POSITIVE
TESS_WINDING_NEGATIVE
TESS_WINDING_ABS_GEQ_TWO

Constructor & Destructor Documentation

◆ Tessellator()

osgUtil::Tessellator::Tessellator ( )

◆ ~Tessellator()

osgUtil::Tessellator::~Tessellator ( )

Member Function Documentation

◆ addContour() [1/2]

void osgUtil::Tessellator::addContour	(	GLenum	mode,
		unsigned int	first,
		unsigned int	last,
		osg::Vec3Array *	vertices )

protected

◆ addContour() [2/2]

void osgUtil::Tessellator::addContour	(	osg::PrimitiveSet *	primitive,
		osg::Vec3Array *	vertices )

protected

◆ addVertex()

void osgUtil::Tessellator::addVertex ( osg::Vec3 * vertex )

Add a vertex to the current contour, see gluTessVertex for details. Note the vertex pointer is returned at the end of tessellation and must not be left dangling or be overwritten until all results are collected.

References vertex().

◆ begin()

void osgUtil::Tessellator::begin ( GLenum mode )

protected

◆ beginCallback()

void CALLBACK osgUtil::Tessellator::beginCallback	(	GLenum	which,
		void *	userData )

staticprotected

References CALLBACK.

◆ beginContour()

void osgUtil::Tessellator::beginContour ( )

◆ beginTessellation()

virtual void osgUtil::Tessellator::beginTessellation ( )

virtual

◆ collectTessellation()

void osgUtil::Tessellator::collectTessellation	(	osg::Geometry &	cxgeom,
		unsigned int	originalIndex )

protected

◆ combine()

void osgUtil::Tessellator::combine	(	osg::Vec3 *	vertex,
		void *	vertex_data[4],
		GLfloat	weight[4] )

protected

References vertex().

◆ combineCallback()

void CALLBACK osgUtil::Tessellator::combineCallback	(	GLdouble	coords[3],
		void *	vertex_data[4],
		GLfloat	weight[4],
		void **	outData,
		void *	useData )

staticprotected

References CALLBACK.

◆ end()

void osgUtil::Tessellator::end ( )

protected

◆ endCallback()

void CALLBACK osgUtil::Tessellator::endCallback ( void * userData )

staticprotected

References CALLBACK.

◆ endContour()

void osgUtil::Tessellator::endContour ( )

◆ endTessellation()

void osgUtil::Tessellator::endTessellation ( )

◆ error()

void osgUtil::Tessellator::error ( GLenum errorCode )

protected

◆ errorCallback()

void CALLBACK osgUtil::Tessellator::errorCallback	(	GLenum	errorCode,
		void *	userData )

staticprotected

References CALLBACK.

◆ getBoundaryOnly()

bool osgUtil::Tessellator::getBoundaryOnly ( )

inline

References _boundaryOnly.

◆ getContours()

osg::Geometry::PrimitiveSetList osgUtil::Tessellator::getContours ( )

inline

References _Contours.

◆ getPrimList()

PrimList & osgUtil::Tessellator::getPrimList ( )

inline

References _primList.

◆ getTessellationType()

TessellationType osgUtil::Tessellator::getTessellationType ( )

inline

References _ttype.

◆ getWindingType()

WindingType osgUtil::Tessellator::getWindingType ( )

inline

References _wtype.

◆ handleNewVertices()

void osgUtil::Tessellator::handleNewVertices	(	osg::Geometry &	geom,
		VertexPtrToIndexMap &	vertexPtrToIndexMap )

protected

◆ reduceArray()

void osgUtil::Tessellator::reduceArray	(	osg::Array *	cold,
		const unsigned int	nnu )

protected

remove unused parts of the array, eg for when retessellating tessellation can introduce extra vertices for concave or crossing boundaries, these will leak memory if not removed when retessellating.

◆ reset()

void osgUtil::Tessellator::reset ( )

◆ retessellatePolygons()

void osgUtil::Tessellator::retessellatePolygons ( osg::Geometry & cxgeom )

Change the contours lists of the geometry into tessellated primitives (the list of primitives in the original geometry is stored in the Tessellator for possible re-use. The name remains retessellatePolygons although it now handles trifans, strips, quads etc. as well as Polygons so as to not break old codes relying on this function name.

◆ setBoundaryOnly()

void osgUtil::Tessellator::setBoundaryOnly ( const bool tt )

inline

Set and get tessellation request boundary only on/off

References _boundaryOnly.

◆ setTessellationNormal()

void osgUtil::Tessellator::setTessellationNormal ( const osg::Vec3 norm )

inline

Define the normal to the tessellated polygon - this provides a hint how to tessellate the contours; see gluTessNormal in red book or man pages. GWM July 2005. Can improve teselation "For example, if you know that all polygons lie in the x-y plane, call gluTessNormal(tess, 0.0, 0.0, 1.0) before rendering any polygons."

References tessNormal.

◆ setTessellationType()

void osgUtil::Tessellator::setTessellationType ( const TessellationType tt )

inline

Set and get tessellation type

References _ttype.

◆ setWindingType()

void osgUtil::Tessellator::setWindingType ( const WindingType wt )

inline

Set and get tessellation windong rule

References _wtype.

◆ vertex()

void osgUtil::Tessellator::vertex ( osg::Vec3 * vertex )

protected

References vertex().

Referenced by addVertex(), combine(), and vertex().

◆ vertexCallback()

void CALLBACK osgUtil::Tessellator::vertexCallback	(	GLvoid *	data,
		void *	userData )

staticprotected

References CALLBACK.

Member Data Documentation

◆ _boundaryOnly

bool osgUtil::Tessellator::_boundaryOnly

protected

Referenced by getBoundaryOnly(), and setBoundaryOnly().

◆ _Contours

osg::Geometry::PrimitiveSetList osgUtil::Tessellator::_Contours

protected

List of primitives that define the contours

Referenced by getContours().

◆ _coordData

Vec3dList osgUtil::Tessellator::_coordData

protected

◆ _errorCode

GLenum osgUtil::Tessellator::_errorCode

protected

◆ _extraPrimitives

unsigned int osgUtil::Tessellator::_extraPrimitives

protected

count of number of extra primitives added

◆ _index

unsigned int osgUtil::Tessellator::_index

protected

count number of primitives in a geometry to get right no. of norms/colurs etc for per_primitive attributes.

◆ _newVertexList

NewVertexList osgUtil::Tessellator::_newVertexList

protected

◆ _numberVerts

unsigned int osgUtil::Tessellator::_numberVerts

protected

number of vertices that are part of the 'original' set of contours

◆ _primList

PrimList osgUtil::Tessellator::_primList

protected

Referenced by getPrimList().

◆ _tobj

osg::GLUtesselator* osgUtil::Tessellator::_tobj

protected

◆ _ttype

TessellationType osgUtil::Tessellator::_ttype

protected

tessellation rule, which parts will become solid

Referenced by getTessellationType(), and setTessellationType().

◆ _wtype

WindingType osgUtil::Tessellator::_wtype

protected

winding rule, which parts will become solid

Referenced by getWindingType(), and setWindingType().

◆ tessNormal

osg::Vec3 osgUtil::Tessellator::tessNormal

protected

the gluTessNormal for tessellation hint

Referenced by setTessellationNormal().

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

Tessellator

Classes

Public Types

Public Member Functions

Protected Types

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ NewVertexList

◆ PrimList

◆ Vec3dList

◆ VertexPtrToIndexMap

Member Enumeration Documentation

◆ TessellationType

◆ WindingType

Constructor & Destructor Documentation

◆ Tessellator()

◆ ~Tessellator()

Member Function Documentation

◆ addContour() [1/2]

◆ addContour() [2/2]

◆ addVertex()

◆ begin()

◆ beginCallback()

◆ beginContour()

◆ beginTessellation()

◆ collectTessellation()

◆ combine()

◆ combineCallback()

◆ end()

◆ endCallback()

◆ endContour()

◆ endTessellation()

◆ error()

◆ errorCallback()

◆ getBoundaryOnly()

◆ getContours()

◆ getPrimList()

◆ getTessellationType()

◆ getWindingType()

◆ handleNewVertices()

◆ reduceArray()

◆ reset()

◆ retessellatePolygons()

◆ setBoundaryOnly()

◆ setTessellationNormal()

◆ setTessellationType()

◆ setWindingType()

◆ vertex()

◆ vertexCallback()

Member Data Documentation

◆ _boundaryOnly

◆ _Contours

◆ _coordData

◆ _errorCode

◆ _extraPrimitives

◆ _index

◆ _newVertexList

◆ _numberVerts

◆ _primList

◆ _tobj

◆ _ttype

◆ _wtype

◆ tessNormal