Open CASCADE Technology  6.9.0

OpenGl_Caps Class Reference

Class to define graphic driver capabilities. Notice that these options will be ignored if particular functionality does not provided by GL driver. More...

#include <OpenGl_Caps.hxx>

Inheritance diagram for OpenGl_Caps:
Inheritance graph
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Data Fields

flags to disable particular functionality, should be used only for testing purposes!
Standard_Boolean vboDisable
 flag permits VBO usage, will significantly affect performance (OFF by default) More...
 
Standard_Boolean pntSpritesDisable
 flag permits Point Sprites usage, will significantly affect performance (OFF by default) More...
 
Standard_Boolean keepArrayData
 Disables freeing CPU memory after building VBOs (OFF by default) More...
 
Standard_Boolean ffpEnable
 Enables FFP (fixed-function pipeline), do not use built-in GLSL programs (ON by default on desktop OpenGL and OFF on OpenGL ES) More...
 
context creation parameters
Standard_Boolean buffersNoSwap
 
Standard_Boolean contextStereo
 
Standard_Boolean contextDebug
 
Standard_Boolean contextSyncDebug
 
Standard_Boolean contextNoAccel
 
Standard_Boolean contextCompatible
 
flags to activate verbose output
Standard_Boolean glslWarnings
 Print GLSL program compilation/linkage warnings, if any. OFF by default. More...
 
Standard_Boolean suppressExtraMsg
 Suppress redundant messages from debug GL context. ON by default. More...
 

class methods

 OpenGl_Caps ()
 Default constructor - initialize with most optimal values. More...
 
virtual ~OpenGl_Caps ()
 Destructor. More...
 
OpenGl_Capsoperator= (const OpenGl_Caps &theCopy)
 Copy maker. More...
 

Additional Inherited Members

- 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
Handle_Standard_Type & 
DynamicType () const
 Returns a type information object about this object. More...
 
Standard_Boolean IsInstance (const 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 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...
 
virtual Handle_Standard_Transient This () const
 Returns a Handle which references this object. Must never be called to objects created in stack. More...
 
Standard_Integer GetRefCount () const
 Get the reference counter of this object. More...
 

Detailed Description

Class to define graphic driver capabilities. Notice that these options will be ignored if particular functionality does not provided by GL driver.

Constructor & Destructor Documentation

OpenGl_Caps::OpenGl_Caps ( )

Default constructor - initialize with most optimal values.

virtual OpenGl_Caps::~OpenGl_Caps ( )
virtual

Destructor.

Member Function Documentation

OpenGl_Caps& OpenGl_Caps::operator= ( const OpenGl_Caps theCopy)

Copy maker.

Field Documentation

Standard_Boolean OpenGl_Caps::buffersNoSwap

Specify that driver should not swap back/front buffers at the end of frame. Useful when OCCT Viewer is integrated into existing OpenGL rendering pipeline as part, thus swapping part is performed outside.

OFF by default.

Standard_Boolean OpenGl_Caps::contextCompatible

Request backward-compatible GL context. This flag requires support in OpenGL driver.

Backward-compatible profile includes deprecated functionality like FFP (fixed-function pipeline), and might be useful for compatibility with application OpenGL code.

Most drivers support all features within backward-compatibility profile, but some limit functionality to OpenGL 2.1 (e.g. OS X) when core profile is not explicitly requested.

Requires OpenGL 3.2+ drivers. Has no effect on OpenGL ES 2.0+ drivers (which do not provie FFP compatibility). Interacts with ffpEnable option, which should be disabled within core profile.

ON by default.

Standard_Boolean OpenGl_Caps::contextDebug

Request debug GL context. This flag requires support in OpenGL driver.

When turned on OpenGL driver emits error and warning messages to provided callback (see OpenGl_Context - messages will be printed to standard output). Affects performance - thus should not be turned on by products in released state.

OFF by default. Currently implemented only for Windows (WGL).

Standard_Boolean OpenGl_Caps::contextNoAccel

Disable hardware acceleration.

This flag overrides default behavior, when accelerated context always preferred over software ones:

  • on Windows will force Microsoft software implementation;
  • on Mac OS X, forces Apple software implementation.

Software implementations are dramatically slower - should never be used.

OFF by default. Currently implemented only for Windows (WGL) and Mac OS X (Cocoa).

Standard_Boolean OpenGl_Caps::contextStereo

Request stereoscopic context (with Quad Buffer). This flag requires support in OpenGL driver.

OFF by default.

Standard_Boolean OpenGl_Caps::contextSyncDebug

Request debug GL context to emit messages within main thread (when contextDebug is specified!).

Some implementations performs GL rendering within dedicated thread(s), in this case debug messages will be pushed from unknown thread making call stack useless, since it does not interconnected to application calls. This option asks GL driver to switch into synchronized implementation. Affects performance - thus should not be turned on by products in released state.

OFF by default.

Standard_Boolean OpenGl_Caps::ffpEnable

Enables FFP (fixed-function pipeline), do not use built-in GLSL programs (ON by default on desktop OpenGL and OFF on OpenGL ES)

Standard_Boolean OpenGl_Caps::glslWarnings

Print GLSL program compilation/linkage warnings, if any. OFF by default.

Standard_Boolean OpenGl_Caps::keepArrayData

Disables freeing CPU memory after building VBOs (OFF by default)

Standard_Boolean OpenGl_Caps::pntSpritesDisable

flag permits Point Sprites usage, will significantly affect performance (OFF by default)

Standard_Boolean OpenGl_Caps::suppressExtraMsg

Suppress redundant messages from debug GL context. ON by default.

Standard_Boolean OpenGl_Caps::vboDisable

flag permits VBO usage, will significantly affect performance (OFF by default)


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