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osgUtil::Tessellator Class Reference
Inheritance diagram for osgUtil::Tessellator:
osg::Referenced

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::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 ()
 
PrimListgetPrimList ()
 
void reset ()
 
- Public Member Functions inherited from osg::Referenced
 Referenced ()
 
 Referenced (bool threadSafeRefUnref)
 
 Referenced (const Referenced &)
 
Referencedoperator= (const Referenced &)
 
virtual void setThreadSafeRefUnref (bool threadSafe)
 
bool getThreadSafeRefUnref () const
 
OpenThreads::MutexgetRefMutex () const
 
int ref () const
 
int unref () const
 
int unref_nodelete () const
 
int referenceCount () const
 
ObserverSetgetObserverSet () const
 
ObserverSetgetOrCreateObserverSet () const
 
void addObserver (Observer *observer) const
 
void removeObserver (Observer *observer) const
 

Protected Types

typedef std::map< osg::Vec3 *, unsigned int > VertexPtrToIndexMap
 
typedef std::vector< NewVertexNewVertexList
 
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::MutexgetGlobalReferencedMutex ()
 
static void setThreadSafeReferenceCounting (bool enableThreadSafeReferenceCounting)
 
static bool getThreadSafeReferenceCounting ()
 
static void setDeleteHandler (DeleteHandler *handler)
 
static DeleteHandlergetDeleteHandler ()
 

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<Vec3d*> osgUtil::Tessellator::Vec3dList
protected
typedef std::map<osg::Vec3*,unsigned int> osgUtil::Tessellator::VertexPtrToIndexMap
protected

Member Enumeration Documentation

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 

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)

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.

void osgUtil::Tessellator::begin ( GLenum  mode)
protected
static void CALLBACK osgUtil::Tessellator::beginCallback ( GLenum  which,
void *  userData 
)
staticprotected
void osgUtil::Tessellator::beginContour ( )
virtual void osgUtil::Tessellator::beginTessellation ( )
virtual
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 when 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


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