Open CASCADE Technology  7.4.0
Public Member Functions | Protected Member Functions | Protected Attributes

OpenGl_LineAttributes Class Reference

Utility class to manage OpenGL state of polygon hatching rasterization and keeping its cached state. The hatching rasterization is implemented using glPolygonStipple function of OpenGL. State of hatching is controlled by two parameters - type of hatching and IsEnabled parameter. The hatching rasterization is enabled only if non-zero index pattern type is selected (zero by default is reserved for solid filling) and if IsEnabled flag is set to true. The IsEnabled parameter is useful for temporarily turning on/off the hatching rasterization without making any costly GL calls for changing the hatch pattern. This is a sharable resource class - it creates OpenGL context objects for each hatch pattern to achieve quicker switching between them, thesse GL objects are freed when the resource is released by owner context. More...

#include <OpenGl_LineAttributes.hxx>

Inheritance diagram for OpenGl_LineAttributes:
Inheritance graph
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Public Member Functions

 OpenGl_LineAttributes ()
 Default constructor. By default the parameters are: More...
 
virtual ~OpenGl_LineAttributes ()
 Default destructor. More...
 
virtual void Release (OpenGl_Context *theGlCtx) override
 Release GL resources. More...
 
virtual Standard_Size EstimatedDataSize () const override
 Returns estimated GPU memory usage - not implemented. More...
 
int TypeOfHatch () const
 Index of currently selected type of hatch. More...
 
int SetTypeOfHatch (const OpenGl_Context *theGlCtx, const Handle< Graphic3d_HatchStyle > &theStyle)
 Sets type of the hatch. More...
 
bool IsEnabled () const
 Current enabled state of the hatching rasterization. More...
 
bool SetEnabled (const OpenGl_Context *theGlCtx, const bool theToEnable)
 Turns on/off the hatching rasterization rasterization. More...
 
- Public Member Functions inherited from OpenGl_Resource
 OpenGl_Resource ()
 Empty constructor. More...
 
virtual ~OpenGl_Resource ()
 Destructor. Inheritors should call Clean (NULL) within it. More...
 
- Public Member Functions inherited from Standard_Transient
 Standard_Transient ()
 Empty constructor. More...
 
 Standard_Transient (const Standard_Transient &)
 Copy constructor – does nothing. More...
 
Standard_Transientoperator= (const Standard_Transient &)
 Assignment operator, needed to avoid copying reference counter. More...
 
virtual ~Standard_Transient ()
 Destructor must be virtual. More...
 
virtual void Delete () const
 Memory deallocator for transient classes. More...
 
virtual const opencascade::handle< Standard_Type > & DynamicType () const
 Returns a type descriptor about this object. More...
 
Standard_Boolean IsInstance (const opencascade::handle< Standard_Type > &theType) const
 Returns a true value if this is an instance of Type. More...
 
Standard_Boolean IsInstance (const Standard_CString theTypeName) const
 Returns a true value if this is an instance of TypeName. More...
 
Standard_Boolean IsKind (const opencascade::handle< Standard_Type > &theType) const
 Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...
 
Standard_Boolean IsKind (const Standard_CString theTypeName) const
 Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...
 
Standard_TransientThis () const
 Returns non-const pointer to this object (like const_cast). For protection against creating handle to objects allocated in stack or call from constructor, it will raise exception Standard_ProgramError if reference counter is zero. More...
 
Standard_Integer GetRefCount () const
 Get the reference counter of this object. More...
 
void IncrementRefCounter () const
 Increments the reference counter of this object. More...
 
Standard_Integer DecrementRefCounter () const
 Decrements the reference counter of this object; returns the decremented value. More...
 

Protected Member Functions

unsigned int init (const OpenGl_Context *theGlCtx, const Handle< Graphic3d_HatchStyle > &theStyle)
 

Protected Attributes

int myTypeOfHatch
 Currently activated type of hatch. More...
 
bool myIsEnabled
 Current enabled state of hatching rasterization. More...
 
OpenGl_MapOfHatchStylesAndIds myStyles
 Hatch patterns. More...
 

Additional Inherited Members

- Public Types inherited from Standard_Transient
typedef void base_type
 Returns a type descriptor about this object. More...
 
- Static Public Member Functions inherited from Standard_Transient
static const char * get_type_name ()
 Returns a type descriptor about this object. More...
 
static const opencascade::handle< Standard_Type > & get_type_descriptor ()
 Returns type descriptor of Standard_Transient class. More...
 

Detailed Description

Utility class to manage OpenGL state of polygon hatching rasterization and keeping its cached state. The hatching rasterization is implemented using glPolygonStipple function of OpenGL. State of hatching is controlled by two parameters - type of hatching and IsEnabled parameter. The hatching rasterization is enabled only if non-zero index pattern type is selected (zero by default is reserved for solid filling) and if IsEnabled flag is set to true. The IsEnabled parameter is useful for temporarily turning on/off the hatching rasterization without making any costly GL calls for changing the hatch pattern. This is a sharable resource class - it creates OpenGL context objects for each hatch pattern to achieve quicker switching between them, thesse GL objects are freed when the resource is released by owner context.

Note
The implementation is not supported by Core Profile and by ES version.

Constructor & Destructor Documentation

◆ OpenGl_LineAttributes()

OpenGl_LineAttributes::OpenGl_LineAttributes ( )

Default constructor. By default the parameters are:

  • IsEnabled (true),
  • TypeOfHatch (0).

◆ ~OpenGl_LineAttributes()

virtual OpenGl_LineAttributes::~OpenGl_LineAttributes ( )
virtual

Default destructor.

Member Function Documentation

◆ EstimatedDataSize()

virtual Standard_Size OpenGl_LineAttributes::EstimatedDataSize ( ) const
inlineoverridevirtual

Returns estimated GPU memory usage - not implemented.

Implements OpenGl_Resource.

◆ init()

unsigned int OpenGl_LineAttributes::init ( const OpenGl_Context theGlCtx,
const Handle< Graphic3d_HatchStyle > &  theStyle 
)
protected

◆ IsEnabled()

bool OpenGl_LineAttributes::IsEnabled ( ) const
inline

Current enabled state of the hatching rasterization.

◆ Release()

virtual void OpenGl_LineAttributes::Release ( OpenGl_Context theGlCtx)
overridevirtual

Release GL resources.

Implements OpenGl_Resource.

◆ SetEnabled()

bool OpenGl_LineAttributes::SetEnabled ( const OpenGl_Context theGlCtx,
const bool  theToEnable 
)

Turns on/off the hatching rasterization rasterization.

◆ SetTypeOfHatch()

int OpenGl_LineAttributes::SetTypeOfHatch ( const OpenGl_Context theGlCtx,
const Handle< Graphic3d_HatchStyle > &  theStyle 
)

Sets type of the hatch.

◆ TypeOfHatch()

int OpenGl_LineAttributes::TypeOfHatch ( ) const
inline

Index of currently selected type of hatch.

Field Documentation

◆ myIsEnabled

bool OpenGl_LineAttributes::myIsEnabled
protected

Current enabled state of hatching rasterization.

◆ myStyles

OpenGl_MapOfHatchStylesAndIds OpenGl_LineAttributes::myStyles
protected

Hatch patterns.

◆ myTypeOfHatch

int OpenGl_LineAttributes::myTypeOfHatch
protected

Currently activated type of hatch.


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