Open CASCADE Technology  6.9.0
Public Member Functions | Static Public Member Functions

OpenGl_Context Class Reference

This class generalize access to the GL context and available extensions. More...

#include <OpenGl_Context.hxx>

Inheritance diagram for OpenGl_Context:
Inheritance graph
[legend]

Public Member Functions

 OpenGl_Context (const Handle< OpenGl_Caps > &theCaps=NULL)
 Empty constructor. You should call Init() to perform initialization with bound GL context. More...
 
virtual ~OpenGl_Context ()
 Destructor. More...
 
void forcedRelease ()
 Release all resources, including shared ones. More...
 
void Share (const Handle< OpenGl_Context > &theShareCtx)
 Share GL context resources. theShareCtx - handle to context to retrieve handles to shared resources. More...
 
Standard_Boolean Init (const Standard_Boolean theIsCoreProfile=Standard_False)
 Initialize class from currently bound OpenGL context. Method should be called only once. More...
 
Standard_Boolean IsValid () const
 
Standard_Boolean Init (const Aspect_Drawable theWindow, const Aspect_Display theDisplay, const Aspect_RenderingContext theGContext, const Standard_Boolean theIsCoreProfile=Standard_False)
 Initialize class from specified window and rendering context. Method should be called only once. More...
 
Aspect_Drawable Window () const
 
Standard_Boolean CheckExtension (const char *theExtName) const
 Check if theExtName extension is supported by active GL context. More...
 
template<typename FuncType_t >
Standard_Boolean FindProc (const char *theFuncName, FuncType_t &theFuncPtr)
 Auxiliary template to retrieve GL function pointer. Pointer to function retrieved from library is statically casted to requested type - there no way to check real signature of exported function. The context should be bound before call. More...
 
Standard_Boolean IsGlGreaterEqual (const Standard_Integer theVerMajor, const Standard_Integer theVerMinor) const
 
void ResetErrors ()
 Clean up errors stack for this GL context (glGetError() in loop). More...
 
Standard_Boolean IsCurrent () const
 This method uses system-dependent API to retrieve information about GL context bound to the current thread. More...
 
Standard_Boolean MakeCurrent ()
 Activates current context. Class should be initialized with appropriate info. More...
 
void SwapBuffers ()
 Swap front/back buffers for this GL context (should be activated before!). More...
 
Standard_Boolean IsRender () const
 Return true if active mode is GL_RENDER (cached state) More...
 
Standard_Boolean IsFeedback () const
 Return true if active mode is GL_FEEDBACK (cached state) More...
 
Standard_Size AvailableMemory () const
 This function retrieves information from GL about free GPU memory that is: More...
 
TCollection_AsciiString MemoryInfo () const
 This function retrieves information from GL about GPU memory and contains more vendor-specific values than AvailableMemory(). More...
 
const Handle< OpenGl_Resource > & GetResource (const TCollection_AsciiString &theKey) const
 Access shared resource by its name. More...
 
template<typename TheHandleType >
Standard_Boolean GetResource (const TCollection_AsciiString &theKey, TheHandleType &theValue) const
 Access shared resource by its name. More...
 
Standard_Boolean ShareResource (const TCollection_AsciiString &theKey, const Handle< OpenGl_Resource > &theResource)
 Register shared resource. Notice that after registration caller shouldn't release it by himself - it will be automatically released on context destruction. More...
 
void ReleaseResource (const TCollection_AsciiString &theKey, const Standard_Boolean theToDelay=Standard_False)
 Release shared resource. If there are more than one reference to this resource (also used by some other existing object) then call will be ignored. This means that current object itself should nullify handle before this call. Notice that this is unrecommended operation at all and should be used only in case of fat resources to release memory for other needs. More...
 
void DelayedRelease (Handle< OpenGl_Resource > &theResource)
 Append resource to queue for delayed clean up. Resources in this queue will be released at next redraw call. More...
 
void ReleaseDelayed ()
 Clean up the delayed release queue. More...
 
OpenGl_ClippingChangeClipping ()
 
const OpenGl_ClippingClipping () const
 
const Handle
< OpenGl_ShaderManager > & 
ShaderManager () const
 
Standard_Integer TextureWrapClamp () const
 Either GL_CLAMP_TO_EDGE (1.2+) or GL_CLAMP (1.1). More...
 
Standard_Integer MaxDegreeOfAnisotropy () const
 
Standard_Integer MaxTextureSize () const
 
Standard_Integer MaxClipPlanes () const
 Get maximum number of clip planes supported by OpenGl. This value is implementation dependent. At least 6 planes should be supported by OpenGl (see specs). More...
 
bool ToUseVbo () const
 Returns true if VBO is supported and permitted. More...
 
Standard_Boolean IsGlNormalizeEnabled () const
 
Standard_Boolean SetGlNormalizeEnabled (Standard_Boolean isEnabled)
 Sets GL_NORMALIZE enabled or disabled. More...
 
void ApplyModelWorldMatrix ()
 Applies matrix stored in ModelWorldState to OpenGl. More...
 
void ApplyWorldViewMatrix ()
 Applies matrix stored in WorldViewState to OpenGl. More...
 
void ApplyModelViewMatrix ()
 Applies combination of matrices stored in ModelWorldState and WorldViewState to OpenGl. More...
 
void ApplyProjectionMatrix ()
 Applies matrix stored in ProjectionState to OpenGl. More...
 
const Handle< Message_Messenger > & Messenger () const
 
void PushMessage (const unsigned int theSource, const unsigned int theType, const unsigned int theId, const unsigned int theSeverity, const TCollection_ExtendedString &theMessage)
 Callback for GL_ARB_debug_output extension. More...
 
Standard_Boolean ExcludeMessage (const unsigned int theSource, const unsigned int theId)
 Adds a filter for messages with theId and theSource (GL_DEBUG_SOURCE_) More...
 
Standard_Boolean IncludeMessage (const unsigned int theSource, const unsigned int theId)
 Removes a filter for messages with theId and theSource (GL_DEBUG_SOURCE_) More...
 
Standard_Boolean HasStereoBuffers () const
 
- 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...
 

Static Public Member Functions

static Standard_Integer GetPowerOfTwo (const Standard_Integer theNumber, const Standard_Integer theThreshold)
 Function for getting power of to number larger or equal to input number. More...
 
static void ReadGlVersion (Standard_Integer &theGlVerMajor, Standard_Integer &theGlVerMinor)
 Read OpenGL version information from active context. More...
 
static Standard_Boolean CheckExtension (const char *theExtString, const char *theExtName)
 Check if theExtName extension is in extensions string. More...
 

Data Fields

core profiles
OpenGl_GlCore11core11
 OpenGL 1.1 core functionality. More...
 
OpenGl_GlCore11Fwdcore11fwd
 OpenGL 1.1 without deprecated entry points. More...
 
OpenGl_GlCore15core15
 OpenGL 1.5 core functionality. More...
 
OpenGl_GlCore15Fwdcore15fwd
 OpenGL 1.5 without deprecated entry points. More...
 
OpenGl_GlCore20core20
 OpenGL 2.0 core functionality (includes 1.5) More...
 
OpenGl_GlCore20Fwdcore20fwd
 OpenGL 2.0 without deprecated entry points. More...
 
OpenGl_GlCore32core32
 OpenGL 3.2 core profile. More...
 
OpenGl_GlCore32Backcore32back
 OpenGL 3.2 backward compatibility profile. More...
 
OpenGl_GlCore33core33
 OpenGL 3.3 core profile. More...
 
OpenGl_GlCore33Backcore33back
 OpenGL 3.3 backward compatibility profile. More...
 
OpenGl_GlCore41core41
 OpenGL 4.1 core profile. More...
 
OpenGl_GlCore41Backcore41back
 OpenGL 4.1 backward compatibility profile. More...
 
OpenGl_GlCore42core42
 OpenGL 4.2 core profile. More...
 
OpenGl_GlCore42Backcore42back
 OpenGL 4.2 backward compatibility profile. More...
 
OpenGl_GlCore43core43
 OpenGL 4.3 core profile. More...
 
OpenGl_GlCore43Backcore43back
 OpenGL 4.3 backward compatibility profile. More...
 
OpenGl_GlCore44core44
 OpenGL 4.4 core profile. More...
 
OpenGl_GlCore44Backcore44back
 OpenGL 4.4 backward compatibility profile. More...
 
Handle< OpenGl_Capscaps
 context options More...
 

methods to alter or retrieve current state

Standard_Integer ReadBuffer ()
 Return active read buffer. More...
 
void SetReadBuffer (const Standard_Integer theReadBuffer)
 Switch read buffer, wrapper for ::glReadBuffer(). More...
 
Standard_Integer DrawBuffer ()
 Return active draw buffer. More...
 
void SetDrawBuffer (const Standard_Integer theDrawBuffer)
 Switch draw buffer, wrapper for ::glDrawBuffer(). More...
 
void SetReadDrawBuffer (const Standard_Integer theBuffer)
 Switch read/draw buffers. More...
 
void FetchState ()
 Fetch OpenGl context state. This class tracks value of several OpenGl state variables. Consulting the cached values is quicker than doing the same via OpenGl API. Call this method if any of the controlled OpenGl state variables has a possibility of being out-of-date. More...
 
const Handle
< OpenGl_ShaderProgram > & 
ActiveProgram () const
 
const Handle< OpenGl_Sampler > & TextureSampler ()
 
Standard_Boolean BindProgram (const Handle< OpenGl_ShaderProgram > &theProgram)
 Bind specified program to current context, or unbind previous one when NULL specified. More...
 
void SetColor4fv (const OpenGl_Vec4 &theColor)
 Setup current color. More...
 
void SetPointSize (const Standard_ShortReal theSize)
 Setup point size. More...
 
void BindDefaultVao ()
 Bind default Vertex Array Object. More...
 
const Handle
< OpenGl_FrameBuffer > & 
DefaultFrameBuffer () const
 Default Frame Buffer Object. More...
 
Handle< OpenGl_FrameBufferSetDefaultFrameBuffer (const Handle< OpenGl_FrameBuffer > &theFbo)
 Setup new Default Frame Buffer Object and return previously set. This call doesn't change Active FBO! More...
 
Standard_Boolean IsDebugContext () const
 Return debug context initialization state. More...
 

extensions

Standard_Boolean hasHighp
 highp in GLSL ES fragment shader is supported More...
 
Standard_Boolean hasUintIndex
 GLuint for index buffer is supported (always available on desktop; on OpenGL ES - since 3.0 or as extension GL_OES_element_index_uint) More...
 
Standard_Boolean hasTexRGBA8
 always available on desktop; on OpenGL ES - since 3.0 or as extension GL_OES_rgb8_rgba8 More...
 
Standard_Boolean arbNPTW
 GL_ARB_texture_non_power_of_two. More...
 
Standard_Boolean arbTexRG
 GL_ARB_texture_rg. More...
 
OpenGl_ArbTexBindlessarbTexBindless
 GL_ARB_bindless_texture. More...
 
OpenGl_ArbTBOarbTBO
 GL_ARB_texture_buffer_object. More...
 
Standard_Boolean arbTboRGB32
 GL_ARB_texture_buffer_object_rgb32 (3-component TBO), in core since 4.0. More...
 
OpenGl_ArbInsarbIns
 GL_ARB_draw_instanced. More...
 
OpenGl_ArbDbgarbDbg
 GL_ARB_debug_output. More...
 
OpenGl_ArbFBOarbFBO
 GL_ARB_framebuffer_object. More...
 
OpenGl_ArbFBOBlitarbFBOBlit
 glBlitFramebuffer function, moved out from OpenGl_ArbFBO structure for compatibility with OpenGL ES 2.0 More...
 
OpenGl_ExtGSextGS
 GL_EXT_geometry_shader4. More...
 
Standard_Boolean extBgra
 GL_EXT_bgra or GL_EXT_texture_format_BGRA8888 on OpenGL ES. More...
 
Standard_Boolean extAnis
 GL_EXT_texture_filter_anisotropic. More...
 
Standard_Boolean extPDS
 GL_EXT_packed_depth_stencil. More...
 
Standard_Boolean atiMem
 GL_ATI_meminfo. More...
 
Standard_Boolean nvxMem
 GL_NVX_gpu_memory_info. More...
 

fields tracking current state

support object for managing shader programs

OpenGl_Utils::MatrixState
< Standard_ShortReal
ModelWorldState
 state of orientation matrix More...
 
OpenGl_Utils::MatrixState
< Standard_ShortReal
WorldViewState
 state of orientation matrix More...
 
OpenGl_Utils::MatrixState
< Standard_ShortReal
ProjectionState
 state of projection matrix More...
 
 DEFINE_STANDARD_RTTI (OpenGl_Context) friend class OpenGl_Window
 state of orientation matrix More...
 

Detailed Description

This class generalize access to the GL context and available extensions.

Functions related to specific OpenGL version or extension are grouped into structures which can be accessed as fields of this class. The most simple way to check that required functionality is available - is NULL check for the group:

if (myContext->core20 != NULL)
{
myGlProgram = myContext->core20->glCreateProgram();
.. do more stuff ..
}
else
{
.. compatibility with outdated configurations ..
}

Current implementation provide access to OpenGL core functionality up to 4.4 version (core12, core13, core14, core15, fields core20) as well as several extensions (arbTBO, arbFBO, etc.).

OpenGL context might be initialized in Core Profile. In this case deprecated functionality become unavailable. To make code easily adaptable to wide range of OpenGL versions, function sets related to each version has two kinds of suffixes:

To select which core** function set should be used in specific case:

Simplified extensions classification:

Notice that some systems provide mechanisms to simultaneously incorporate with GL contexts with different capabilities. For this reason OpenGl_Context should be initialized and used for each GL context independently.

Constructor & Destructor Documentation

OpenGl_Context::OpenGl_Context ( const Handle< OpenGl_Caps > &  theCaps = NULL)

Empty constructor. You should call Init() to perform initialization with bound GL context.

virtual OpenGl_Context::~OpenGl_Context ( )
virtual

Destructor.

Member Function Documentation

const Handle< OpenGl_ShaderProgram >& OpenGl_Context::ActiveProgram ( ) const
inline
Returns
active GLSL program
void OpenGl_Context::ApplyModelViewMatrix ( )

Applies combination of matrices stored in ModelWorldState and WorldViewState to OpenGl.

void OpenGl_Context::ApplyModelWorldMatrix ( )

Applies matrix stored in ModelWorldState to OpenGl.

void OpenGl_Context::ApplyProjectionMatrix ( )

Applies matrix stored in ProjectionState to OpenGl.

void OpenGl_Context::ApplyWorldViewMatrix ( )

Applies matrix stored in WorldViewState to OpenGl.

Standard_Size OpenGl_Context::AvailableMemory ( ) const

This function retrieves information from GL about free GPU memory that is:

  • OS-dependent. On some OS it is per-process and on others - for entire system.
  • Vendor-dependent. Currently available only on NVIDIA and AMD/ATi drivers only.
  • Numbers meaning may vary. You should use this info only for diagnostics purposes.
    Returns
    free GPU dedicated memory in bytes.
void OpenGl_Context::BindDefaultVao ( )

Bind default Vertex Array Object.

Standard_Boolean OpenGl_Context::BindProgram ( const Handle< OpenGl_ShaderProgram > &  theProgram)

Bind specified program to current context, or unbind previous one when NULL specified.

Returns
true if some program is bound to context
OpenGl_Clipping& OpenGl_Context::ChangeClipping ( )
inline
Returns
tool for management of clippings within this context.
Standard_Boolean OpenGl_Context::CheckExtension ( const char *  theExtName) const

Check if theExtName extension is supported by active GL context.

static Standard_Boolean OpenGl_Context::CheckExtension ( const char *  theExtString,
const char *  theExtName 
)
static

Check if theExtName extension is in extensions string.

const OpenGl_Clipping& OpenGl_Context::Clipping ( ) const
inline
Returns
tool for management of clippings within this context.
const Handle< OpenGl_FrameBuffer >& OpenGl_Context::DefaultFrameBuffer ( ) const
inline

Default Frame Buffer Object.

OpenGl_Context::DEFINE_STANDARD_RTTI ( OpenGl_Context  )

state of orientation matrix

void OpenGl_Context::DelayedRelease ( Handle< OpenGl_Resource > &  theResource)

Append resource to queue for delayed clean up. Resources in this queue will be released at next redraw call.

Standard_Integer OpenGl_Context::DrawBuffer ( )
inline

Return active draw buffer.

Standard_Boolean OpenGl_Context::ExcludeMessage ( const unsigned int  theSource,
const unsigned int  theId 
)

Adds a filter for messages with theId and theSource (GL_DEBUG_SOURCE_)

void OpenGl_Context::FetchState ( )

Fetch OpenGl context state. This class tracks value of several OpenGl state variables. Consulting the cached values is quicker than doing the same via OpenGl API. Call this method if any of the controlled OpenGl state variables has a possibility of being out-of-date.

template<typename FuncType_t >
Standard_Boolean OpenGl_Context::FindProc ( const char *  theFuncName,
FuncType_t &  theFuncPtr 
)
inline

Auxiliary template to retrieve GL function pointer. Pointer to function retrieved from library is statically casted to requested type - there no way to check real signature of exported function. The context should be bound before call.

void OpenGl_Context::forcedRelease ( )

Release all resources, including shared ones.

static Standard_Integer OpenGl_Context::GetPowerOfTwo ( const Standard_Integer  theNumber,
const Standard_Integer  theThreshold 
)
inlinestatic

Function for getting power of to number larger or equal to input number.

Parameters
theNumbernumber to 'power of two'
theThresholdupper threshold
Returns
power of two number
const Handle< OpenGl_Resource >& OpenGl_Context::GetResource ( const TCollection_AsciiString theKey) const

Access shared resource by its name.

Parameters
theKey- unique identifier;
Returns
handle to shared resource or NULL.
template<typename TheHandleType >
Standard_Boolean OpenGl_Context::GetResource ( const TCollection_AsciiString theKey,
TheHandleType &  theValue 
) const
inline

Access shared resource by its name.

Parameters
theKey- unique identifier;
theValue- handle to fill;
Returns
true if resource was shared.
Standard_Boolean OpenGl_Context::HasStereoBuffers ( ) const
inline
Returns
true if OpenGl context supports left and right rendering buffers.
Standard_Boolean OpenGl_Context::IncludeMessage ( const unsigned int  theSource,
const unsigned int  theId 
)

Removes a filter for messages with theId and theSource (GL_DEBUG_SOURCE_)

Standard_Boolean OpenGl_Context::Init ( const Standard_Boolean  theIsCoreProfile = Standard_False)

Initialize class from currently bound OpenGL context. Method should be called only once.

Returns
false if no GL context is bound to the current thread
Standard_Boolean OpenGl_Context::Init ( const Aspect_Drawable  theWindow,
const Aspect_Display  theDisplay,
const Aspect_RenderingContext  theGContext,
const Standard_Boolean  theIsCoreProfile = Standard_False 
)

Initialize class from specified window and rendering context. Method should be called only once.

Returns
false if OpenGL context can not be bound to specified window
Standard_Boolean OpenGl_Context::IsCurrent ( ) const

This method uses system-dependent API to retrieve information about GL context bound to the current thread.

Returns
true if current thread is bound to this GL context
Standard_Boolean OpenGl_Context::IsDebugContext ( ) const
inline

Return debug context initialization state.

Standard_Boolean OpenGl_Context::IsFeedback ( ) const
inline

Return true if active mode is GL_FEEDBACK (cached state)

Standard_Boolean OpenGl_Context::IsGlGreaterEqual ( const Standard_Integer  theVerMajor,
const Standard_Integer  theVerMinor 
) const
inline
Returns
true if detected GL version is greater or equal to requested one.
Standard_Boolean OpenGl_Context::IsGlNormalizeEnabled ( ) const
inline
Returns
cached state of GL_NORMALIZE.
Standard_Boolean OpenGl_Context::IsRender ( ) const
inline

Return true if active mode is GL_RENDER (cached state)

Standard_Boolean OpenGl_Context::IsValid ( ) const
inline
Returns
true if this context is valid (has been initialized)
Standard_Boolean OpenGl_Context::MakeCurrent ( )

Activates current context. Class should be initialized with appropriate info.

Standard_Integer OpenGl_Context::MaxClipPlanes ( ) const

Get maximum number of clip planes supported by OpenGl. This value is implementation dependent. At least 6 planes should be supported by OpenGl (see specs).

Returns
value for GL_MAX_CLIP_PLANES
Standard_Integer OpenGl_Context::MaxDegreeOfAnisotropy ( ) const
Returns
maximum degree of anisotropy texture filter
Standard_Integer OpenGl_Context::MaxTextureSize ( ) const
Returns
value for GL_MAX_TEXTURE_SIZE
TCollection_AsciiString OpenGl_Context::MemoryInfo ( ) const

This function retrieves information from GL about GPU memory and contains more vendor-specific values than AvailableMemory().

const Handle< Message_Messenger >& OpenGl_Context::Messenger ( ) const
inline
Returns
messenger instance
void OpenGl_Context::PushMessage ( const unsigned int  theSource,
const unsigned int  theType,
const unsigned int  theId,
const unsigned int  theSeverity,
const TCollection_ExtendedString theMessage 
)

Callback for GL_ARB_debug_output extension.

Parameters
theSourcemessage source within GL_DEBUG_SOURCE_ enumeration
theTypemessage type within GL_DEBUG_TYPE_ enumeration
theIdmessage ID within source
theSeveritymessage severity within GL_DEBUG_SEVERITY_ enumeration
theMessagethe message itself
Standard_Integer OpenGl_Context::ReadBuffer ( )
inline

Return active read buffer.

static void OpenGl_Context::ReadGlVersion ( Standard_Integer theGlVerMajor,
Standard_Integer theGlVerMinor 
)
static

Read OpenGL version information from active context.

void OpenGl_Context::ReleaseDelayed ( )

Clean up the delayed release queue.

void OpenGl_Context::ReleaseResource ( const TCollection_AsciiString theKey,
const Standard_Boolean  theToDelay = Standard_False 
)

Release shared resource. If there are more than one reference to this resource (also used by some other existing object) then call will be ignored. This means that current object itself should nullify handle before this call. Notice that this is unrecommended operation at all and should be used only in case of fat resources to release memory for other needs.

Parameters
theKeyunique identifier
theToDelaypostpone release until next redraw call
void OpenGl_Context::ResetErrors ( )

Clean up errors stack for this GL context (glGetError() in loop).

void OpenGl_Context::SetColor4fv ( const OpenGl_Vec4 theColor)

Setup current color.

Handle< OpenGl_FrameBuffer > OpenGl_Context::SetDefaultFrameBuffer ( const Handle< OpenGl_FrameBuffer > &  theFbo)

Setup new Default Frame Buffer Object and return previously set. This call doesn't change Active FBO!

void OpenGl_Context::SetDrawBuffer ( const Standard_Integer  theDrawBuffer)

Switch draw buffer, wrapper for ::glDrawBuffer().

Standard_Boolean OpenGl_Context::SetGlNormalizeEnabled ( Standard_Boolean  isEnabled)

Sets GL_NORMALIZE enabled or disabled.

Returns
old value of the flag
void OpenGl_Context::SetPointSize ( const Standard_ShortReal  theSize)

Setup point size.

void OpenGl_Context::SetReadBuffer ( const Standard_Integer  theReadBuffer)

Switch read buffer, wrapper for ::glReadBuffer().

void OpenGl_Context::SetReadDrawBuffer ( const Standard_Integer  theBuffer)
inline

Switch read/draw buffers.

const Handle< OpenGl_ShaderManager >& OpenGl_Context::ShaderManager ( ) const
inline
Returns
tool for management of shader programs within this context.
void OpenGl_Context::Share ( const Handle< OpenGl_Context > &  theShareCtx)

Share GL context resources. theShareCtx - handle to context to retrieve handles to shared resources.

Standard_Boolean OpenGl_Context::ShareResource ( const TCollection_AsciiString theKey,
const Handle< OpenGl_Resource > &  theResource 
)

Register shared resource. Notice that after registration caller shouldn't release it by himself - it will be automatically released on context destruction.

Parameters
theKey- unique identifier, shouldn't be empty;
theResource- new resource to register, shouldn't be NULL.
void OpenGl_Context::SwapBuffers ( )

Swap front/back buffers for this GL context (should be activated before!).

const Handle< OpenGl_Sampler >& OpenGl_Context::TextureSampler ( )
inline
Returns
OpenGL sampler object used to override default texture parameters
Standard_Integer OpenGl_Context::TextureWrapClamp ( ) const
inline

Either GL_CLAMP_TO_EDGE (1.2+) or GL_CLAMP (1.1).

bool OpenGl_Context::ToUseVbo ( ) const
inline

Returns true if VBO is supported and permitted.

Aspect_Drawable OpenGl_Context::Window ( ) const
inline
Returns
the window handle (GLXDrawable) currently bound to this OpenGL context

Field Documentation

OpenGl_ArbDbg* OpenGl_Context::arbDbg

GL_ARB_debug_output.

OpenGl_ArbFBO* OpenGl_Context::arbFBO

GL_ARB_framebuffer_object.

OpenGl_ArbFBOBlit* OpenGl_Context::arbFBOBlit

glBlitFramebuffer function, moved out from OpenGl_ArbFBO structure for compatibility with OpenGL ES 2.0

OpenGl_ArbIns* OpenGl_Context::arbIns

GL_ARB_draw_instanced.

Standard_Boolean OpenGl_Context::arbNPTW

GL_ARB_texture_non_power_of_two.

OpenGl_ArbTBO* OpenGl_Context::arbTBO

GL_ARB_texture_buffer_object.

Standard_Boolean OpenGl_Context::arbTboRGB32

GL_ARB_texture_buffer_object_rgb32 (3-component TBO), in core since 4.0.

OpenGl_ArbTexBindless* OpenGl_Context::arbTexBindless

GL_ARB_bindless_texture.

Standard_Boolean OpenGl_Context::arbTexRG

GL_ARB_texture_rg.

Standard_Boolean OpenGl_Context::atiMem

GL_ATI_meminfo.

Handle< OpenGl_Caps > OpenGl_Context::caps

context options

OpenGl_GlCore11* OpenGl_Context::core11

OpenGL 1.1 core functionality.

OpenGl_GlCore11Fwd* OpenGl_Context::core11fwd

OpenGL 1.1 without deprecated entry points.

OpenGl_GlCore15* OpenGl_Context::core15

OpenGL 1.5 core functionality.

OpenGl_GlCore15Fwd* OpenGl_Context::core15fwd

OpenGL 1.5 without deprecated entry points.

OpenGl_GlCore20* OpenGl_Context::core20

OpenGL 2.0 core functionality (includes 1.5)

OpenGl_GlCore20Fwd* OpenGl_Context::core20fwd

OpenGL 2.0 without deprecated entry points.

OpenGl_GlCore32* OpenGl_Context::core32

OpenGL 3.2 core profile.

OpenGl_GlCore32Back* OpenGl_Context::core32back

OpenGL 3.2 backward compatibility profile.

OpenGl_GlCore33* OpenGl_Context::core33

OpenGL 3.3 core profile.

OpenGl_GlCore33Back* OpenGl_Context::core33back

OpenGL 3.3 backward compatibility profile.

OpenGl_GlCore41* OpenGl_Context::core41

OpenGL 4.1 core profile.

OpenGl_GlCore41Back* OpenGl_Context::core41back

OpenGL 4.1 backward compatibility profile.

OpenGl_GlCore42* OpenGl_Context::core42

OpenGL 4.2 core profile.

OpenGl_GlCore42Back* OpenGl_Context::core42back

OpenGL 4.2 backward compatibility profile.

OpenGl_GlCore43* OpenGl_Context::core43

OpenGL 4.3 core profile.

OpenGl_GlCore43Back* OpenGl_Context::core43back

OpenGL 4.3 backward compatibility profile.

OpenGl_GlCore44* OpenGl_Context::core44

OpenGL 4.4 core profile.

OpenGl_GlCore44Back* OpenGl_Context::core44back

OpenGL 4.4 backward compatibility profile.

Standard_Boolean OpenGl_Context::extAnis

GL_EXT_texture_filter_anisotropic.

Standard_Boolean OpenGl_Context::extBgra

GL_EXT_bgra or GL_EXT_texture_format_BGRA8888 on OpenGL ES.

OpenGl_ExtGS* OpenGl_Context::extGS

GL_EXT_geometry_shader4.

Standard_Boolean OpenGl_Context::extPDS

GL_EXT_packed_depth_stencil.

Standard_Boolean OpenGl_Context::hasHighp

highp in GLSL ES fragment shader is supported

Standard_Boolean OpenGl_Context::hasTexRGBA8

always available on desktop; on OpenGL ES - since 3.0 or as extension GL_OES_rgb8_rgba8

Standard_Boolean OpenGl_Context::hasUintIndex

GLuint for index buffer is supported (always available on desktop; on OpenGL ES - since 3.0 or as extension GL_OES_element_index_uint)

OpenGl_Utils::MatrixState<Standard_ShortReal> OpenGl_Context::ModelWorldState

state of orientation matrix

Standard_Boolean OpenGl_Context::nvxMem

GL_NVX_gpu_memory_info.

OpenGl_Utils::MatrixState<Standard_ShortReal> OpenGl_Context::ProjectionState

state of projection matrix

OpenGl_Utils::MatrixState<Standard_ShortReal> OpenGl_Context::WorldViewState

state of orientation matrix


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