osgUtil::Tessellator Class Reference

Inheritance diagram for osgUtil::Tessellator:

Classes
struct	NewVertex
struct	Prim
struct	Vec3d

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::Vec3 * >	VertexPointList
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 ()
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 threadSafe)
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	setThreadSafeReferenceCounting (bool enableThreadSafeReferenceCounting)
static bool	getThreadSafeReferenceCounting ()
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

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

protected

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

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

protected

typedef std::vector<osg::Vec3*> osgUtil::Tessellator::VertexPointList

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

protected

Member Enumeration Documentation

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

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

osgUtil::Tessellator::Tessellator

(

)

osgUtil::Tessellator::~Tessellator

(

)

Member Function Documentation

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

protected

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

protected

void osgUtil::Tessellator::addVertex

(

osg::Vec3 *

vertex

)

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

protected

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

staticprotected

void osgUtil::Tessellator::beginContour

(

)

void osgUtil::Tessellator::beginTessellation

(

)

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

protected

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

protected

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

staticprotected

void osgUtil::Tessellator::end ( )

protected

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

staticprotected

void osgUtil::Tessellator::endContour

(

)

void osgUtil::Tessellator::endTessellation

(

)

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

protected

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

staticprotected

bool osgUtil::Tessellator::getBoundaryOnly ( )

inline

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

inline

PrimList& osgUtil::Tessellator::getPrimList ( )

inline

TessellationType osgUtil::Tessellator::getTessellationType ( )

inline

WindingType osgUtil::Tessellator::getWindingType ( )

inline

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

protected

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

protected

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

void osgUtil::Tessellator::reset

(

)

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.

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

inline

Set and get tessellation request boundary only on/off

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."

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

inline

Set and get tessellation type

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

inline

Set and get tessellation windong rule

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

protected

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

staticprotected

Member Data Documentation

bool osgUtil::Tessellator::_boundaryOnly

protected

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

protected

List of primitives that define the contours

Vec3dList osgUtil::Tessellator::_coordData

protected

GLenum osgUtil::Tessellator::_errorCode

protected

unsigned int osgUtil::Tessellator::_extraPrimitives

protected

count of number of extra primitives added

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 osgUtil::Tessellator::_newVertexList

protected

unsigned int osgUtil::Tessellator::_numberVerts

protected

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

PrimList osgUtil::Tessellator::_primList

protected

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

protected

TessellationType osgUtil::Tessellator::_ttype

protected

tessellation rule, which parts will become solid

WindingType osgUtil::Tessellator::_wtype

protected

winding rule, which parts will become solid

osg::Vec3 osgUtil::Tessellator::tessNormal

protected

the gluTessNormal for tessellation hint

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

• Tessellator