Open CASCADE Technology  7.4.1.dev
Public Types | 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
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Public Types

typedef NCollection_Shared< NCollection_DataMap< TCollection_AsciiString, Handle< OpenGl_Resource > > > OpenGl_ResourcesMap
 
- Public Types inherited from Standard_Transient
typedef void base_type
 Returns a type descriptor about this object. More...
 

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 FindProcVerbose (const char *&theLastFailFuncName, 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...
 
template<typename FuncType_t >
Standard_Boolean FindProc (const char *theFuncName, FuncType_t &theFuncPtr)
 Auxiliary template to retrieve GL function pointer. Same as FindProcVerbose() but without auxiliary last function name argument. More...
 
Standard_Boolean IsGlGreaterEqual (const Standard_Integer theVerMajor, const Standard_Integer theVerMinor) const
 
Standard_Integer VersionMajor () const
 Return cached GL version major number. More...
 
Standard_Integer VersionMinor () const
 Return cached GL version minor number. More...
 
const OpenGl_GlFunctionsFunctions () const
 Access entire map of loaded OpenGL functions. More...
 
bool ResetErrors (const bool theToPrintErrors=false)
 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 SetSwapInterval (const Standard_Integer theInterval)
 Setup swap interval (VSync). 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...
 
void MemoryInfo (TColStd_IndexedDataMapOfStringString &theDict) const
 This function retrieves information from GL about GPU memory. More...
 
void DiagnosticInformation (TColStd_IndexedDataMapOfStringString &theDict, Graphic3d_DiagnosticInfo theFlags) const
 Fill in the dictionary with OpenGL info. Should be called with bound context. 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...
 
template<class T >
void DelayedRelease (Handle< T > &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...
 
const OpenGl_ResourcesMapSharedResources () const
 Return map of shared resources. 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_Boolean HasTextureBaseLevel () const
 
const Handle< Image_SupportedFormats > & SupportedTextureFormats () const
 Return map of supported texture formats. More...
 
Standard_Integer MaxDegreeOfAnisotropy () const
 
Standard_Integer MaxTextureSize () const
 
Standard_Integer MaxCombinedTextureUnits () const
 
Standard_Integer MaxTextureUnitsFFP () const
 This method returns the multi-texture limit for obsolete fixed-function pipeline. Use MaxCombinedTextureUnits() instead for limits for using programmable pipeline. More...
 
Graphic3d_TextureUnit SpriteTextureUnit () const
 Return texture unit to be used for sprites (Graphic3d_TextureUnit_PointSprite by default). More...
 
Standard_Integer MaxMsaaSamples () const
 
Standard_Integer MaxDumpSizeX () const
 
Standard_Integer MaxDumpSizeY () const
 
Standard_Integer MaxDrawBuffers () const
 
Standard_Integer MaxColorAttachments () 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...
 
Standard_Boolean HasRayTracing () const
 
Standard_Boolean HasRayTracingTextures () const
 
Standard_Boolean HasRayTracingAdaptiveSampling () const
 
Standard_Boolean HasRayTracingAdaptiveSamplingAtomic () const
 
bool HasSRGB () const
 Returns TRUE if sRGB rendering is supported. More...
 
bool ToRenderSRGB () const
 Returns TRUE if sRGB rendering is supported and permitted. More...
 
bool IsWindowSRGB () const
 Returns TRUE if window/surface buffer is sRGB-ready. More...
 
void SetWindowSRGB (bool theIsSRgb)
 Overrides if window/surface buffer is sRGB-ready or not (initialized with the context). More...
 
OpenGl_Vec4 Vec4FromQuantityColor (const OpenGl_Vec4 &theColor) const
 Convert Quantity_ColorRGBA into vec4 with conversion or no conversion into non-linear sRGB basing on ToRenderSRGB() flag. More...
 
const OpenGl_Vec4Vec4LinearFromQuantityColor (const OpenGl_Vec4 &theColor) const
 Convert Quantity_ColorRGBA into vec4. Quantity_Color is expected to be linear RGB, hence conversion is NOT required. More...
 
OpenGl_Vec4 Vec4sRGBFromQuantityColor (const OpenGl_Vec4 &theColor) const
 Convert Quantity_ColorRGBA (linear RGB) into non-linear sRGB vec4. More...
 
Standard_Boolean HasPBR () const
 Returns TRUE if PBR shading model is supported. Basically, feature requires OpenGL 3.0+ / OpenGL ES 3.0+ hardware; more precisely: More...
 
Graphic3d_TextureUnit PBREnvLUTTexUnit () const
 Returns texture unit where Environment Lookup Table is expected to be bound, or 0 if PBR is unavailable. More...
 
Graphic3d_TextureUnit PBRDiffIBLMapSHTexUnit () const
 Returns texture unit where Diffuse (irradiance) IBL map's spherical harmonics coefficients is expected to be bound, or 0 if PBR is unavailable. More...
 
Graphic3d_TextureUnit PBRSpecIBLMapTexUnit () const
 Returns texture unit where Specular IBL map is expected to be bound, or 0 if PBR is unavailable. 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...
 
Standard_Integer PolygonMode () const
 
Standard_Integer SetPolygonMode (const Standard_Integer theMode)
 Sets polygon rasterization mode (glPolygonMode() function). More...
 
bool IsPolygonHatchEnabled () const
 
bool SetPolygonHatchEnabled (const bool theIsEnabled)
 Sets enabled state of polygon hatching rasterization without affecting currently selected hatching pattern. More...
 
Standard_Integer PolygonHatchStyle () const
 
Standard_Integer SetPolygonHatchStyle (const Handle< Graphic3d_HatchStyle > &theStyle)
 Sets polygon hatch pattern. Zero-index value is a default alias for solid filling. More...
 
void SetPolygonOffset (const Graphic3d_PolygonOffset &theOffset)
 Sets and applies current polygon offset. More...
 
const Graphic3d_PolygonOffsetPolygonOffset () const
 Returns currently applied polygon offset parameters. More...
 
const Handle< Graphic3d_Camera > & Camera () const
 Returns camera object. More...
 
void SetCamera (const Handle< Graphic3d_Camera > &theCamera)
 Sets camera object to the context and update matrices. More...
 
void ApplyModelWorldMatrix ()
 Applies matrix into shader manager stored in ModelWorldState to OpenGl. In "model -> world -> view -> projection" it performs: model -> world. More...
 
void ApplyWorldViewMatrix ()
 Applies matrix stored in WorldViewState to OpenGl. In "model -> world -> view -> projection" it performs: model -> world -> view, where model -> world is identical matrix. More...
 
void ApplyModelViewMatrix ()
 Applies combination of matrices stored in ModelWorldState and WorldViewState to OpenGl. In "model -> world -> view -> projection" it performs: model -> world -> view. More...
 
void ApplyProjectionMatrix ()
 Applies matrix stored in ProjectionState to OpenGl. In "model -> world -> view -> projection" it performs: view -> projection. 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 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...
 

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...
 
- 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...
 

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_GlCore30core30
 OpenGL 3.0 core functionality. More...
 
OpenGl_GlCore30Fwdcore30fwd
 OpenGL 3.0 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...
 
OpenGl_GlCore45core45
 OpenGL 4.5 core profile. More...
 
OpenGl_GlCore45Backcore45back
 OpenGL 4.5 backward compatibility profile. More...
 
Handle< OpenGl_Capscaps
 context options More...
 
extensions
Standard_Boolean hasGetBufferData
 flag indicating if GetBufferSubData() is supported More...
 
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 hasTexFloatLinear
 texture-filterable state for 32-bit floating texture formats (always on desktop, GL_OES_texture_float_linear within OpenGL ES) More...
 
Standard_Boolean hasTexSRGB
 sRGB texture formats (desktop OpenGL 2.1, OpenGL ES 3.0 or GL_EXT_texture_sRGB) More...
 
Standard_Boolean hasFboSRGB
 sRGB FBO render targets (desktop OpenGL 2.1, OpenGL ES 3.0) More...
 
Standard_Boolean hasSRGBControl
 sRGB write control (any desktop OpenGL, OpenGL ES + GL_EXT_sRGB_write_control extension) More...
 
OpenGl_FeatureFlag hasFlatShading
 Complex flag indicating support of Flat shading (Graphic3d_TOSM_FACET) (always available on desktop; on OpenGL ES - since 3.0 or as extension GL_OES_standard_derivatives) More...
 
OpenGl_FeatureFlag hasGlslBitwiseOps
 GLSL supports bitwise operations; OpenGL 3.0 / OpenGL ES 3.0 (GLSL 130 / GLSL ES 300) or OpenGL 2.1 + GL_EXT_gpu_shader4. More...
 
OpenGl_FeatureFlag hasDrawBuffers
 Complex flag indicating support of multiple draw buffers (desktop OpenGL 2.0, OpenGL ES 3.0, GL_ARB_draw_buffers, GL_EXT_draw_buffers) More...
 
OpenGl_FeatureFlag hasFloatBuffer
 Complex flag indicating support of float color buffer format (desktop OpenGL 3.0, GL_ARB_color_buffer_float, GL_EXT_color_buffer_float) More...
 
OpenGl_FeatureFlag hasHalfFloatBuffer
 Complex flag indicating support of half-float color buffer format (desktop OpenGL 3.0, GL_ARB_color_buffer_float, GL_EXT_color_buffer_half_float) More...
 
OpenGl_FeatureFlag hasSampleVariables
 Complex flag indicating support of MSAA variables in GLSL shader (desktop OpenGL 4.0, GL_ARB_sample_shading) More...
 
OpenGl_FeatureFlag hasGeometryStage
 Complex flag indicating support of Geometry shader (desktop OpenGL 3.2, OpenGL ES 3.2, GL_EXT_geometry_shader) More...
 
Standard_Boolean arbDrawBuffers
 GL_ARB_draw_buffers. More...
 
Standard_Boolean arbNPTW
 GL_ARB_texture_non_power_of_two. More...
 
Standard_Boolean arbTexRG
 GL_ARB_texture_rg. More...
 
Standard_Boolean arbTexFloat
 GL_ARB_texture_float (on desktop OpenGL - since 3.0 or as extension GL_ARB_texture_float; on OpenGL ES - since 3.0);. More...
 
OpenGl_ArbSamplerObjectarbSamplerObject
 GL_ARB_sampler_objects (on desktop OpenGL - since 3.3 or as extension GL_ARB_sampler_objects; on OpenGL ES - since 3.0) More...
 
OpenGl_ArbTexBindlessarbTexBindless
 GL_ARB_bindless_texture. More...
 
OpenGl_ArbTBOarbTBO
 GL_ARB_texture_buffer_object (on desktop OpenGL - since 3.1 or as extension GL_ARB_texture_buffer_object; on OpenGL ES - since 3.2) 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 (on desktop OpenGL - since 3.1 or as extebsion GL_ARB_draw_instanced; on OpenGL ES - since 3.0 or as extension GL_ANGLE_instanced_arrays to WebGL 1.0) More...
 
OpenGl_ArbDbgarbDbg
 GL_ARB_debug_output (on desktop OpenGL - since 4.3 or as extension GL_ARB_debug_output; on OpenGL ES - since 3.2 or as extension GL_KHR_debug) 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...
 
Standard_Boolean arbSampleShading
 GL_ARB_sample_shading. More...
 
Standard_Boolean extFragDepth
 GL_EXT_frag_depth on OpenGL ES 2.0 (gl_FragDepthEXT built-in variable, before OpenGL ES 3.0) More...
 
Standard_Boolean extDrawBuffers
 GL_EXT_draw_buffers. 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...
 
Standard_Boolean oesSampleVariables
 GL_OES_sample_variables. More...
 
Standard_Boolean oesStdDerivatives
 GL_OES_standard_derivatives. More...
 

methods to alter or retrieve current state

static Standard_Boolean CheckIsTransparent (const OpenGl_Aspects *theAspect, const Handle< Graphic3d_PresentationAttributes > &theHighlight, Standard_ShortReal &theAlphaFront, Standard_ShortReal &theAlphaBack)
 Checks if transparency is required for the given aspect and highlight style. More...
 
static Standard_Boolean CheckIsTransparent (const OpenGl_Aspects *theAspect, const Handle< Graphic3d_PresentationAttributes > &theHighlight)
 Checks if transparency is required for the given aspect and highlight style. More...
 
static void DumpJsonOpenGlState (Standard_OStream &theOStream, Standard_Integer theDepth=-1)
 Dumps the content of openGL state into the stream. More...
 
const Handle< OpenGl_FrameStats > & FrameStats () const
 Return structure holding frame statistics. More...
 
void SetFrameStats (const Handle< OpenGl_FrameStats > &theStats)
 Set structure holding frame statistics. This call makes sense only if application defines OpenGl_FrameStats sub-class. More...
 
const Standard_IntegerViewport () const
 Return cached viewport definition (x, y, width, height). More...
 
void ResizeViewport (const Standard_Integer theRect[4])
 Resize the viewport (alias for glViewport). More...
 
const Standard_IntegerVirtualViewport () const
 Return virtual viewport definition (x, y, width, height). More...
 
Standard_Integer ReadBuffer ()
 Return active read buffer. More...
 
void SetReadBuffer (const Standard_Integer theReadBuffer)
 Switch read buffer, wrapper for ::glReadBuffer(). More...
 
Standard_Integer DrawBuffer (Standard_Integer theIndex=0) const
 Return active draw buffer attached to a render target referred by index (layout location). More...
 
void SetDrawBuffer (const Standard_Integer theDrawBuffer)
 Switch draw buffer, wrapper for ::glDrawBuffer(). More...
 
void SetDrawBuffers (const Standard_Integer theNb, const Standard_Integer *theDrawBuffers)
 Switch draw buffer, wrapper for ::glDrawBuffers (GLsizei, const GLenum*). More...
 
void SetReadDrawBuffer (const Standard_Integer theBuffer)
 Switch read/draw buffers. More...
 
bool IsFrameBufferSRGB () const
 Returns cached GL_FRAMEBUFFER_SRGB state. If TRUE, GLSL program is expected to write linear RGB color. Otherwise, GLSL program might need manually converting result color into sRGB color space. More...
 
void SetFrameBufferSRGB (bool theIsFbo, bool theIsFboSRgb=true)
 Enables/disables GL_FRAMEBUFFER_SRGB flag. This flag can be set to: More...
 
bool ColorMask () const
 Return cached flag indicating writing into color buffer is enabled or disabled (glColorMask). More...
 
bool SetColorMask (bool theToWriteColor)
 Enable/disable writing into color buffer (wrapper for glColorMask). More...
 
bool AllowSampleAlphaToCoverage () const
 Return TRUE if GL_SAMPLE_ALPHA_TO_COVERAGE usage is allowed. More...
 
void SetAllowSampleAlphaToCoverage (bool theToEnable)
 Allow GL_SAMPLE_ALPHA_TO_COVERAGE usage. More...
 
bool SampleAlphaToCoverage () const
 Return GL_SAMPLE_ALPHA_TO_COVERAGE state. More...
 
bool SetSampleAlphaToCoverage (bool theToEnable)
 Enable/disable GL_SAMPLE_ALPHA_TO_COVERAGE. More...
 
bool ToCullBackFaces () const
 Return back face culling state. More...
 
void SetCullBackFaces (bool theToEnable)
 Enable or disable back face culling (glEnable (GL_CULL_FACE)). 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_TextureSet > & ActiveTextures () const
 
Handle< OpenGl_TextureSetBindTextures (const Handle< OpenGl_TextureSet > &theTextures)
 Bind specified texture set to current context taking into account active GLSL program. More...
 
Handle< OpenGl_TextureSetBindTextures (const Handle< OpenGl_TextureSet > &theTextures, const Handle< OpenGl_ShaderProgram > &theProgram)
 Bind specified texture set to current context, or unbind previous one when NULL specified. More...
 
const Handle< OpenGl_ShaderProgram > & ActiveProgram () const
 
Standard_Boolean BindProgram (const Handle< OpenGl_ShaderProgram > &theProgram)
 Bind specified program to current context, or unbind previous one when NULL specified. More...
 
void SetShadingMaterial (const OpenGl_Aspects *theAspect, const Handle< Graphic3d_PresentationAttributes > &theHighlight)
 Setup current shading material. More...
 
void SetColor4fv (const OpenGl_Vec4 &theColor)
 Setup current color. More...
 
void SetTypeOfLine (const Aspect_TypeOfLine theType, const Standard_ShortReal theFactor=1.0f)
 Setup type of line. More...
 
void SetLineStipple (const uint16_t thePattern)
 Setup stipple line pattern with 1.0f factor; wrapper for glLineStipple(). More...
 
void SetLineStipple (const Standard_ShortReal theFactor, const uint16_t thePattern)
 Setup type of line; wrapper for glLineStipple(). More...
 
void SetLineWidth (const Standard_ShortReal theWidth)
 Setup width of line. More...
 
void SetPointSize (const Standard_ShortReal theSize)
 Setup point size. More...
 
void SetPointSpriteOrigin ()
 Setup point sprite origin using GL_POINT_SPRITE_COORD_ORIGIN state: More...
 
void SetTextureMatrix (const Handle< Graphic3d_TextureParams > &theParams, const Standard_Boolean theIsTopDown)
 Setup texture matrix to active GLSL program or to FFP global state using glMatrixMode (GL_TEXTURE). 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...
 
void EnableFeatures () const
 Checks if transparency is required for the given aspect and highlight style. More...
 
void DisableFeatures () const
 Checks if transparency is required for the given aspect and highlight style. More...
 
unsigned int Resolution () const
 Return resolution for rendering text. More...
 
Standard_ShortReal ResolutionRatio () const
 Resolution scale factor (rendered resolution to standard resolution). This scaling factor for parameters like text size to be properly displayed on device (screen / printer). More...
 
Standard_ShortReal RenderScale () const
 Rendering scale factor (rendering viewport height to real window buffer height). More...
 
Standard_Boolean HasRenderScale () const
 Return TRUE if rendering scale factor is not 1. More...
 
Standard_ShortReal RenderScaleInv () const
 Rendering scale factor (inverted value). More...
 
Standard_ShortReal LineWidthScale () const
 Return scale factor for line width. More...
 
void SetResolution (unsigned int theResolution, Standard_ShortReal theRatio, Standard_ShortReal theScale)
 Set resolution ratio. Note that this method rounds to nearest integer. More...
 
void SetResolutionRatio (const Standard_ShortReal theRatio)
 Set resolution ratio. Note that this method rounds to nearest integer. More...
 
Standard_ShortReal LineFeather () const
 Return line feater width in pixels. More...
 
void SetLineFeather (Standard_ShortReal theValue)
 Set line feater width. More...
 
bool GetBufferSubData (GLenum theTarget, GLintptr theOffset, GLsizeiptr theSize, void *theData)
 Wrapper over glGetBufferSubData(), implemented as: More...
 
const TCollection_AsciiStringVendor () const
 Return Graphics Driver's vendor. More...
 
void DumpJson (Standard_OStream &theOStream, Standard_Integer theDepth=-1) const
 Dumps the content of me into the stream. More...
 
void SetShadeModel (Graphic3d_TypeOfShadingModel theModel)
 Set GL_SHADE_MODEL value. More...
 

public properties tracking current state

OpenGl_MatrixState< Standard_ShortRealModelWorldState
 state of orientation matrix More...
 
OpenGl_MatrixState< Standard_ShortRealWorldViewState
 state of orientation matrix More...
 
OpenGl_MatrixState< Standard_ShortRealProjectionState
 state of projection 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.

Matrices of OpenGl transformations: model -> world -> view -> projection These matrices might be changed for local transformation, transform persistent using direct access to current matrix of ModelWorldState, WorldViewState and ProjectionState After, these matrices should be applyed using ApplyModelWorldMatrix, ApplyWorldViewMatrix, ApplyModelViewMatrix or ApplyProjectionMatrix.

Member Typedef Documentation

◆ OpenGl_ResourcesMap

Constructor & Destructor Documentation

◆ OpenGl_Context()

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

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

◆ ~OpenGl_Context()

virtual OpenGl_Context::~OpenGl_Context ( )
virtual

Destructor.

Member Function Documentation

◆ ActiveProgram()

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

◆ ActiveTextures()

const Handle< OpenGl_TextureSet >& OpenGl_Context::ActiveTextures ( ) const
inline
Returns
active textures

◆ AllowSampleAlphaToCoverage()

bool OpenGl_Context::AllowSampleAlphaToCoverage ( ) const
inline

Return TRUE if GL_SAMPLE_ALPHA_TO_COVERAGE usage is allowed.

◆ ApplyModelViewMatrix()

void OpenGl_Context::ApplyModelViewMatrix ( )

Applies combination of matrices stored in ModelWorldState and WorldViewState to OpenGl. In "model -> world -> view -> projection" it performs: model -> world -> view.

◆ ApplyModelWorldMatrix()

void OpenGl_Context::ApplyModelWorldMatrix ( )

Applies matrix into shader manager stored in ModelWorldState to OpenGl. In "model -> world -> view -> projection" it performs: model -> world.

◆ ApplyProjectionMatrix()

void OpenGl_Context::ApplyProjectionMatrix ( )

Applies matrix stored in ProjectionState to OpenGl. In "model -> world -> view -> projection" it performs: view -> projection.

◆ ApplyWorldViewMatrix()

void OpenGl_Context::ApplyWorldViewMatrix ( )

Applies matrix stored in WorldViewState to OpenGl. In "model -> world -> view -> projection" it performs: model -> world -> view, where model -> world is identical matrix.

◆ AvailableMemory()

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.

◆ BindDefaultVao()

void OpenGl_Context::BindDefaultVao ( )

Bind default Vertex Array Object.

◆ BindProgram()

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

◆ BindTextures() [1/2]

Handle< OpenGl_TextureSet > OpenGl_Context::BindTextures ( const Handle< OpenGl_TextureSet > &  theTextures)
inline

Bind specified texture set to current context taking into account active GLSL program.

Deprecated:
("BindTextures() with explicit GLSL program should be used instead")

◆ BindTextures() [2/2]

Handle< OpenGl_TextureSet > OpenGl_Context::BindTextures ( const Handle< OpenGl_TextureSet > &  theTextures,
const Handle< OpenGl_ShaderProgram > &  theProgram 
)

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

Parameters
theTextures[in] texture set to bind
theProgram[in] program attributes; when not NULL, mock textures will be bound to texture units expected by GLSL program, but undefined by texture set
Returns
previous texture set

◆ Camera()

const Handle< Graphic3d_Camera >& OpenGl_Context::Camera ( ) const
inline

Returns camera object.

◆ ChangeClipping()

OpenGl_Clipping& OpenGl_Context::ChangeClipping ( )
inline
Returns
tool for management of clippings within this context.

◆ CheckExtension() [1/2]

Standard_Boolean OpenGl_Context::CheckExtension ( const char *  theExtName) const

Check if theExtName extension is supported by active GL context.

◆ CheckExtension() [2/2]

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

Check if theExtName extension is in extensions string.

◆ CheckIsTransparent() [1/2]

static Standard_Boolean OpenGl_Context::CheckIsTransparent ( const OpenGl_Aspects theAspect,
const Handle< Graphic3d_PresentationAttributes > &  theHighlight,
Standard_ShortReal theAlphaFront,
Standard_ShortReal theAlphaBack 
)
static

Checks if transparency is required for the given aspect and highlight style.

◆ CheckIsTransparent() [2/2]

static Standard_Boolean OpenGl_Context::CheckIsTransparent ( const OpenGl_Aspects theAspect,
const Handle< Graphic3d_PresentationAttributes > &  theHighlight 
)
inlinestatic

Checks if transparency is required for the given aspect and highlight style.

◆ Clipping()

const OpenGl_Clipping& OpenGl_Context::Clipping ( ) const
inline
Returns
tool for management of clippings within this context.

◆ ColorMask()

bool OpenGl_Context::ColorMask ( ) const
inline

Return cached flag indicating writing into color buffer is enabled or disabled (glColorMask).

◆ DefaultFrameBuffer()

const Handle< OpenGl_FrameBuffer >& OpenGl_Context::DefaultFrameBuffer ( ) const
inline

Default Frame Buffer Object.

◆ DelayedRelease()

template<class T >
void OpenGl_Context::DelayedRelease ( Handle< T > &  theResource)
inline

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

◆ DiagnosticInformation()

void OpenGl_Context::DiagnosticInformation ( TColStd_IndexedDataMapOfStringString theDict,
Graphic3d_DiagnosticInfo  theFlags 
) const

Fill in the dictionary with OpenGL info. Should be called with bound context.

◆ DisableFeatures()

void OpenGl_Context::DisableFeatures ( ) const

Checks if transparency is required for the given aspect and highlight style.

◆ DrawBuffer()

Standard_Integer OpenGl_Context::DrawBuffer ( Standard_Integer  theIndex = 0) const
inline

Return active draw buffer attached to a render target referred by index (layout location).

◆ DumpJson()

void OpenGl_Context::DumpJson ( Standard_OStream theOStream,
Standard_Integer  theDepth = -1 
) const

Dumps the content of me into the stream.

◆ DumpJsonOpenGlState()

static void OpenGl_Context::DumpJsonOpenGlState ( Standard_OStream theOStream,
Standard_Integer  theDepth = -1 
)
static

Dumps the content of openGL state into the stream.

◆ EnableFeatures()

void OpenGl_Context::EnableFeatures ( ) const

Checks if transparency is required for the given aspect and highlight style.

◆ ExcludeMessage()

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_)

◆ FetchState()

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.

◆ FindProc()

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

Auxiliary template to retrieve GL function pointer. Same as FindProcVerbose() but without auxiliary last function name argument.

◆ FindProcVerbose()

template<typename FuncType_t >
Standard_Boolean OpenGl_Context::FindProcVerbose ( const char *&  theLastFailFuncName,
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.

Parameters
theLastFailFuncName[out] set to theFuncName in case of failure, unmodified on success
theFuncName[in] function name to find
theFuncPtr[out] retrieved function pointer
Returns
TRUE on success

◆ forcedRelease()

void OpenGl_Context::forcedRelease ( )

Release all resources, including shared ones.

◆ FrameStats()

const Handle< OpenGl_FrameStats >& OpenGl_Context::FrameStats ( ) const
inline

Return structure holding frame statistics.

◆ Functions()

const OpenGl_GlFunctions* OpenGl_Context::Functions ( ) const
inline

Access entire map of loaded OpenGL functions.

◆ GetBufferSubData()

bool OpenGl_Context::GetBufferSubData ( GLenum  theTarget,
GLintptr  theOffset,
GLsizeiptr  theSize,
void *  theData 
)

Wrapper over glGetBufferSubData(), implemented as:

  • OpenGL 1.5+ (desktop) via glGetBufferSubData();
  • OpenGL ES 3.0+ via glMapBufferRange();
  • WebGL 2.0+ via gl.getBufferSubData().
    Parameters
    theTarget[in] target buffer to map
    theOffset[in] offset to the beginning of sub-data
    theSize[in] number of bytes to read
    theData[out] destination pointer to fill
    Returns
    FALSE if functionality is unavailable

◆ GetPowerOfTwo()

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

◆ GetResource() [1/2]

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.

◆ GetResource() [2/2]

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.

◆ HasPBR()

Standard_Boolean OpenGl_Context::HasPBR ( ) const
inline

Returns TRUE if PBR shading model is supported. Basically, feature requires OpenGL 3.0+ / OpenGL ES 3.0+ hardware; more precisely:

  • Graphics hardware with moderate capabilities for compiling long enough GLSL program.
  • FBO (e.g. for baking environment).
  • Multi-texturing with >= 4 units (LUT and IBL textures).
  • GL_RG32F texture format (arbTexRG + arbTexFloat)
  • Cubemap texture lookup textureCubeLod()/textureLod() with LOD index within Fragment Shader, which requires GLSL OpenGL 3.0+ / OpenGL ES 3.0+ or OpenGL 2.1 + GL_EXT_gpu_shader4 extension.

◆ HasRayTracing()

Standard_Boolean OpenGl_Context::HasRayTracing ( ) const
inline
Returns
TRUE if ray tracing mode is supported

◆ HasRayTracingAdaptiveSampling()

Standard_Boolean OpenGl_Context::HasRayTracingAdaptiveSampling ( ) const
inline
Returns
TRUE if adaptive screen sampling in ray tracing mode is supported

◆ HasRayTracingAdaptiveSamplingAtomic()

Standard_Boolean OpenGl_Context::HasRayTracingAdaptiveSamplingAtomic ( ) const
inline
Returns
TRUE if atomic adaptive screen sampling in ray tracing mode is supported

◆ HasRayTracingTextures()

Standard_Boolean OpenGl_Context::HasRayTracingTextures ( ) const
inline
Returns
TRUE if textures in ray tracing mode are supported

◆ HasRenderScale()

Standard_Boolean OpenGl_Context::HasRenderScale ( ) const
inline

Return TRUE if rendering scale factor is not 1.

◆ HasSRGB()

bool OpenGl_Context::HasSRGB ( ) const
inline

Returns TRUE if sRGB rendering is supported.

◆ HasStereoBuffers()

Standard_Boolean OpenGl_Context::HasStereoBuffers ( ) const
inline
Returns
true if OpenGl context supports left and right rendering buffers.

◆ HasTextureBaseLevel()

Standard_Boolean OpenGl_Context::HasTextureBaseLevel ( ) const
inline
Returns
true if texture parameters GL_TEXTURE_BASE_LEVEL/GL_TEXTURE_MAX_LEVEL are supported.

◆ IncludeMessage()

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_)

◆ Init() [1/2]

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

◆ Init() [2/2]

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

◆ IsCurrent()

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

◆ IsDebugContext()

Standard_Boolean OpenGl_Context::IsDebugContext ( ) const
inline

Return debug context initialization state.

◆ IsFeedback()

Standard_Boolean OpenGl_Context::IsFeedback ( ) const
inline

Return true if active mode is GL_FEEDBACK (cached state)

◆ IsFrameBufferSRGB()

bool OpenGl_Context::IsFrameBufferSRGB ( ) const
inline

Returns cached GL_FRAMEBUFFER_SRGB state. If TRUE, GLSL program is expected to write linear RGB color. Otherwise, GLSL program might need manually converting result color into sRGB color space.

◆ IsGlGreaterEqual()

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.

◆ IsGlNormalizeEnabled()

Standard_Boolean OpenGl_Context::IsGlNormalizeEnabled ( ) const
inline
Returns
cached state of GL_NORMALIZE.

◆ IsPolygonHatchEnabled()

bool OpenGl_Context::IsPolygonHatchEnabled ( ) const
inline
Returns
cached enabled state of polygon hatching rasterization.

◆ IsRender()

Standard_Boolean OpenGl_Context::IsRender ( ) const
inline

Return true if active mode is GL_RENDER (cached state)

◆ IsValid()

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

◆ IsWindowSRGB()

bool OpenGl_Context::IsWindowSRGB ( ) const
inline

Returns TRUE if window/surface buffer is sRGB-ready.

When offscreen FBOs are created in sRGB, but window is not sRGB-ready, blitting into window should be done with manual gamma correction.

In desktop OpenGL, window buffer can be considered as sRGB-ready by default, even when application has NOT requested sRGB-ready pixel format, and rendering is managed via GL_FRAMEBUFFER_SRGB state.

In OpenGL ES, sRGB-ready window surface should be explicitly requested on construction, and cannot be disabled/enabled without GL_EXT_sRGB_write_control extension afterwards (GL_FRAMEBUFFER_SRGB can be considered as always tuned ON).

◆ LineFeather()

Standard_ShortReal OpenGl_Context::LineFeather ( ) const
inline

Return line feater width in pixels.

◆ LineWidthScale()

Standard_ShortReal OpenGl_Context::LineWidthScale ( ) const
inline

Return scale factor for line width.

◆ MakeCurrent()

Standard_Boolean OpenGl_Context::MakeCurrent ( )

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

◆ MaxClipPlanes()

Standard_Integer OpenGl_Context::MaxClipPlanes ( ) const
inline

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

◆ MaxColorAttachments()

Standard_Integer OpenGl_Context::MaxColorAttachments ( ) const
inline
Returns
value for GL_MAX_COLOR_ATTACHMENTS

◆ MaxCombinedTextureUnits()

Standard_Integer OpenGl_Context::MaxCombinedTextureUnits ( ) const
inline
Returns
value for GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS

◆ MaxDegreeOfAnisotropy()

Standard_Integer OpenGl_Context::MaxDegreeOfAnisotropy ( ) const
inline
Returns
maximum degree of anisotropy texture filter

◆ MaxDrawBuffers()

Standard_Integer OpenGl_Context::MaxDrawBuffers ( ) const
inline
Returns
value for GL_MAX_DRAW_BUFFERS

◆ MaxDumpSizeX()

Standard_Integer OpenGl_Context::MaxDumpSizeX ( ) const
inline
Returns
maximum FBO width for image dump

◆ MaxDumpSizeY()

Standard_Integer OpenGl_Context::MaxDumpSizeY ( ) const
inline
Returns
maximum FBO height for image dump

◆ MaxMsaaSamples()

Standard_Integer OpenGl_Context::MaxMsaaSamples ( ) const
inline
Returns
value for GL_MAX_SAMPLES

◆ MaxTextureSize()

Standard_Integer OpenGl_Context::MaxTextureSize ( ) const
inline
Returns
value for GL_MAX_TEXTURE_SIZE

◆ MaxTextureUnitsFFP()

Standard_Integer OpenGl_Context::MaxTextureUnitsFFP ( ) const
inline

This method returns the multi-texture limit for obsolete fixed-function pipeline. Use MaxCombinedTextureUnits() instead for limits for using programmable pipeline.

Returns
value for GL_MAX_TEXTURE_UNITS

◆ MemoryInfo() [1/2]

TCollection_AsciiString OpenGl_Context::MemoryInfo ( ) const

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

◆ MemoryInfo() [2/2]

void OpenGl_Context::MemoryInfo ( TColStd_IndexedDataMapOfStringString theDict) const

This function retrieves information from GL about GPU memory.

◆ Messenger()

const Handle< Message_Messenger >& OpenGl_Context::Messenger ( ) const
inline
Returns
messenger instance

◆ PBRDiffIBLMapSHTexUnit()

Graphic3d_TextureUnit OpenGl_Context::PBRDiffIBLMapSHTexUnit ( ) const
inline

Returns texture unit where Diffuse (irradiance) IBL map's spherical harmonics coefficients is expected to be bound, or 0 if PBR is unavailable.

◆ PBREnvLUTTexUnit()

Graphic3d_TextureUnit OpenGl_Context::PBREnvLUTTexUnit ( ) const
inline

Returns texture unit where Environment Lookup Table is expected to be bound, or 0 if PBR is unavailable.

◆ PBRSpecIBLMapTexUnit()

Graphic3d_TextureUnit OpenGl_Context::PBRSpecIBLMapTexUnit ( ) const
inline

Returns texture unit where Specular IBL map is expected to be bound, or 0 if PBR is unavailable.

◆ PolygonHatchStyle()

Standard_Integer OpenGl_Context::PolygonHatchStyle ( ) const
inline
Returns
cached state of polygon hatch type.

◆ PolygonMode()

Standard_Integer OpenGl_Context::PolygonMode ( ) const
inline
Returns
cached state of polygon rasterization mode (glPolygonMode()).

◆ PolygonOffset()

const Graphic3d_PolygonOffset& OpenGl_Context::PolygonOffset ( ) const
inline

Returns currently applied polygon offset parameters.

◆ PushMessage()

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

◆ ReadBuffer()

Standard_Integer OpenGl_Context::ReadBuffer ( )
inline

Return active read buffer.

◆ ReadGlVersion()

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

Read OpenGL version information from active context.

◆ ReleaseDelayed()

void OpenGl_Context::ReleaseDelayed ( )

Clean up the delayed release queue.

◆ ReleaseResource()

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

◆ RenderScale()

Standard_ShortReal OpenGl_Context::RenderScale ( ) const
inline

Rendering scale factor (rendering viewport height to real window buffer height).

◆ RenderScaleInv()

Standard_ShortReal OpenGl_Context::RenderScaleInv ( ) const
inline

Rendering scale factor (inverted value).

◆ ResetErrors()

bool OpenGl_Context::ResetErrors ( const bool  theToPrintErrors = false)

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

Returns
true if some error has been cleared

◆ ResizeViewport()

void OpenGl_Context::ResizeViewport ( const Standard_Integer  theRect[4])

Resize the viewport (alias for glViewport).

Parameters
theRectviewport definition (x, y, width, height)

◆ Resolution()

unsigned int OpenGl_Context::Resolution ( ) const
inline

Return resolution for rendering text.

◆ ResolutionRatio()

Standard_ShortReal OpenGl_Context::ResolutionRatio ( ) const
inline

Resolution scale factor (rendered resolution to standard resolution). This scaling factor for parameters like text size to be properly displayed on device (screen / printer).

◆ SampleAlphaToCoverage()

bool OpenGl_Context::SampleAlphaToCoverage ( ) const
inline

Return GL_SAMPLE_ALPHA_TO_COVERAGE state.

◆ SetAllowSampleAlphaToCoverage()

void OpenGl_Context::SetAllowSampleAlphaToCoverage ( bool  theToEnable)
inline

Allow GL_SAMPLE_ALPHA_TO_COVERAGE usage.

◆ SetCamera()

void OpenGl_Context::SetCamera ( const Handle< Graphic3d_Camera > &  theCamera)

Sets camera object to the context and update matrices.

◆ SetColor4fv()

void OpenGl_Context::SetColor4fv ( const OpenGl_Vec4 theColor)

Setup current color.

◆ SetColorMask()

bool OpenGl_Context::SetColorMask ( bool  theToWriteColor)

Enable/disable writing into color buffer (wrapper for glColorMask).

◆ SetCullBackFaces()

void OpenGl_Context::SetCullBackFaces ( bool  theToEnable)

Enable or disable back face culling (glEnable (GL_CULL_FACE)).

◆ SetDefaultFrameBuffer()

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!

◆ SetDrawBuffer()

void OpenGl_Context::SetDrawBuffer ( const Standard_Integer  theDrawBuffer)

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

◆ SetDrawBuffers()

void OpenGl_Context::SetDrawBuffers ( const Standard_Integer  theNb,
const Standard_Integer theDrawBuffers 
)

Switch draw buffer, wrapper for ::glDrawBuffers (GLsizei, const GLenum*).

◆ SetFrameBufferSRGB()

void OpenGl_Context::SetFrameBufferSRGB ( bool  theIsFbo,
bool  theIsFboSRgb = true 
)

Enables/disables GL_FRAMEBUFFER_SRGB flag. This flag can be set to:

  • TRUE when writing into offscreen FBO (always expected to be in sRGB or RGBF formats).
  • TRUE when writing into sRGB-ready window buffer (might require choosing proper pixel format on window creation).
  • FALSE if sRGB rendering is not supported or sRGB-not-ready window buffer is used for drawing.
    Parameters
    theIsFbo[in] flag indicating writing into offscreen FBO (always expected sRGB-ready when sRGB FBO is supported) or into window buffer (FALSE, sRGB-readiness might vary).
    theIsSRgb[in] flag indicating off-screen FBO is sRGB-ready

◆ SetFrameStats()

void OpenGl_Context::SetFrameStats ( const Handle< OpenGl_FrameStats > &  theStats)
inline

Set structure holding frame statistics. This call makes sense only if application defines OpenGl_FrameStats sub-class.

◆ SetGlNormalizeEnabled()

Standard_Boolean OpenGl_Context::SetGlNormalizeEnabled ( Standard_Boolean  isEnabled)

Sets GL_NORMALIZE enabled or disabled.

Returns
old value of the flag

◆ SetLineFeather()

void OpenGl_Context::SetLineFeather ( Standard_ShortReal  theValue)
inline

Set line feater width.

◆ SetLineStipple() [1/2]

void OpenGl_Context::SetLineStipple ( const uint16_t  thePattern)
inline

Setup stipple line pattern with 1.0f factor; wrapper for glLineStipple().

◆ SetLineStipple() [2/2]

void OpenGl_Context::SetLineStipple ( const Standard_ShortReal  theFactor,
const uint16_t  thePattern 
)

Setup type of line; wrapper for glLineStipple().

◆ SetLineWidth()

void OpenGl_Context::SetLineWidth ( const Standard_ShortReal  theWidth)

Setup width of line.

◆ SetPointSize()

void OpenGl_Context::SetPointSize ( const Standard_ShortReal  theSize)

Setup point size.

◆ SetPointSpriteOrigin()

void OpenGl_Context::SetPointSpriteOrigin ( )

Setup point sprite origin using GL_POINT_SPRITE_COORD_ORIGIN state:

  • GL_UPPER_LEFT when GLSL program is active; flipping should be handled in GLSL program for compatibility with OpenGL ES
  • GL_LOWER_LEFT for FFP

◆ SetPolygonHatchEnabled()

bool OpenGl_Context::SetPolygonHatchEnabled ( const bool  theIsEnabled)

Sets enabled state of polygon hatching rasterization without affecting currently selected hatching pattern.

Returns
previous state of polygon hatching mode.

◆ SetPolygonHatchStyle()

Standard_Integer OpenGl_Context::SetPolygonHatchStyle ( const Handle< Graphic3d_HatchStyle > &  theStyle)

Sets polygon hatch pattern. Zero-index value is a default alias for solid filling.

Parameters
thetype of hatch supported by base implementation of OpenGl_LineAttributes (Aspect_HatchStyle) or the type supported by custom implementation derived from OpenGl_LineAttributes class.
Returns
old type of hatch.

◆ SetPolygonMode()

Standard_Integer OpenGl_Context::SetPolygonMode ( const Standard_Integer  theMode)

Sets polygon rasterization mode (glPolygonMode() function).

Returns
old value of the rasterization mode.

◆ SetPolygonOffset()

void OpenGl_Context::SetPolygonOffset ( const Graphic3d_PolygonOffset theOffset)

Sets and applies current polygon offset.

◆ SetReadBuffer()

void OpenGl_Context::SetReadBuffer ( const Standard_Integer  theReadBuffer)

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

◆ SetReadDrawBuffer()

void OpenGl_Context::SetReadDrawBuffer ( const Standard_Integer  theBuffer)
inline

Switch read/draw buffers.

◆ SetResolution()

void OpenGl_Context::SetResolution ( unsigned int  theResolution,
Standard_ShortReal  theRatio,
Standard_ShortReal  theScale 
)
inline

Set resolution ratio. Note that this method rounds to nearest integer.

◆ SetResolutionRatio()

void OpenGl_Context::SetResolutionRatio ( const Standard_ShortReal  theRatio)
inline

Set resolution ratio. Note that this method rounds to nearest integer.

◆ SetSampleAlphaToCoverage()

bool OpenGl_Context::SetSampleAlphaToCoverage ( bool  theToEnable)

Enable/disable GL_SAMPLE_ALPHA_TO_COVERAGE.

◆ SetShadeModel()

void OpenGl_Context::SetShadeModel ( Graphic3d_TypeOfShadingModel  theModel)

Set GL_SHADE_MODEL value.

◆ SetShadingMaterial()

void OpenGl_Context::SetShadingMaterial ( const OpenGl_Aspects theAspect,
const Handle< Graphic3d_PresentationAttributes > &  theHighlight 
)

Setup current shading material.

◆ SetSwapInterval()

Standard_Boolean OpenGl_Context::SetSwapInterval ( const Standard_Integer  theInterval)

Setup swap interval (VSync).

◆ SetTextureMatrix()

void OpenGl_Context::SetTextureMatrix ( const Handle< Graphic3d_TextureParams > &  theParams,
const Standard_Boolean  theIsTopDown 
)

Setup texture matrix to active GLSL program or to FFP global state using glMatrixMode (GL_TEXTURE).

Parameters
theParams[in] texture parameters
theIsTopDown[in] texture top-down flag

◆ SetTypeOfLine()

void OpenGl_Context::SetTypeOfLine ( const Aspect_TypeOfLine  theType,
const Standard_ShortReal  theFactor = 1.0f 
)

Setup type of line.

◆ SetWindowSRGB()

void OpenGl_Context::SetWindowSRGB ( bool  theIsSRgb)
inline

Overrides if window/surface buffer is sRGB-ready or not (initialized with the context).

◆ ShaderManager()

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

◆ Share()

void OpenGl_Context::Share ( const Handle< OpenGl_Context > &  theShareCtx)

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

◆ SharedResources()

const OpenGl_ResourcesMap& OpenGl_Context::SharedResources ( ) const
inline

Return map of shared resources.

◆ ShareResource()

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.

◆ SpriteTextureUnit()

Graphic3d_TextureUnit OpenGl_Context::SpriteTextureUnit ( ) const
inline

Return texture unit to be used for sprites (Graphic3d_TextureUnit_PointSprite by default).

◆ SupportedTextureFormats()

const Handle< Image_SupportedFormats >& OpenGl_Context::SupportedTextureFormats ( ) const
inline

Return map of supported texture formats.

◆ SwapBuffers()

void OpenGl_Context::SwapBuffers ( )

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

◆ TextureWrapClamp()

Standard_Integer OpenGl_Context::TextureWrapClamp ( ) const
inline

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

◆ ToCullBackFaces()

bool OpenGl_Context::ToCullBackFaces ( ) const
inline

Return back face culling state.

◆ ToRenderSRGB()

bool OpenGl_Context::ToRenderSRGB ( ) const
inline

Returns TRUE if sRGB rendering is supported and permitted.

◆ ToUseVbo()

bool OpenGl_Context::ToUseVbo ( ) const
inline

Returns true if VBO is supported and permitted.

◆ Vec4FromQuantityColor()

OpenGl_Vec4 OpenGl_Context::Vec4FromQuantityColor ( const OpenGl_Vec4 theColor) const
inline

Convert Quantity_ColorRGBA into vec4 with conversion or no conversion into non-linear sRGB basing on ToRenderSRGB() flag.

◆ Vec4LinearFromQuantityColor()

const OpenGl_Vec4& OpenGl_Context::Vec4LinearFromQuantityColor ( const OpenGl_Vec4 theColor) const
inline

Convert Quantity_ColorRGBA into vec4. Quantity_Color is expected to be linear RGB, hence conversion is NOT required.

◆ Vec4sRGBFromQuantityColor()

OpenGl_Vec4 OpenGl_Context::Vec4sRGBFromQuantityColor ( const OpenGl_Vec4 theColor) const
inline

Convert Quantity_ColorRGBA (linear RGB) into non-linear sRGB vec4.

◆ Vendor()

const TCollection_AsciiString& OpenGl_Context::Vendor ( ) const
inline

Return Graphics Driver's vendor.

◆ VersionMajor()

Standard_Integer OpenGl_Context::VersionMajor ( ) const
inline

Return cached GL version major number.

◆ VersionMinor()

Standard_Integer OpenGl_Context::VersionMinor ( ) const
inline

Return cached GL version minor number.

◆ Viewport()

const Standard_Integer* OpenGl_Context::Viewport ( ) const
inline

Return cached viewport definition (x, y, width, height).

◆ VirtualViewport()

const Standard_Integer* OpenGl_Context::VirtualViewport ( ) const
inline

Return virtual viewport definition (x, y, width, height).

◆ Window()

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

Field Documentation

◆ arbDbg

OpenGl_ArbDbg* OpenGl_Context::arbDbg

GL_ARB_debug_output (on desktop OpenGL - since 4.3 or as extension GL_ARB_debug_output; on OpenGL ES - since 3.2 or as extension GL_KHR_debug)

◆ arbDrawBuffers

Standard_Boolean OpenGl_Context::arbDrawBuffers

GL_ARB_draw_buffers.

◆ arbFBO

OpenGl_ArbFBO* OpenGl_Context::arbFBO

GL_ARB_framebuffer_object.

◆ arbFBOBlit

OpenGl_ArbFBOBlit* OpenGl_Context::arbFBOBlit

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

◆ arbIns

OpenGl_ArbIns* OpenGl_Context::arbIns

GL_ARB_draw_instanced (on desktop OpenGL - since 3.1 or as extebsion GL_ARB_draw_instanced; on OpenGL ES - since 3.0 or as extension GL_ANGLE_instanced_arrays to WebGL 1.0)

◆ arbNPTW

Standard_Boolean OpenGl_Context::arbNPTW

GL_ARB_texture_non_power_of_two.

◆ arbSamplerObject

OpenGl_ArbSamplerObject* OpenGl_Context::arbSamplerObject

GL_ARB_sampler_objects (on desktop OpenGL - since 3.3 or as extension GL_ARB_sampler_objects; on OpenGL ES - since 3.0)

◆ arbSampleShading

Standard_Boolean OpenGl_Context::arbSampleShading

GL_ARB_sample_shading.

◆ arbTBO

OpenGl_ArbTBO* OpenGl_Context::arbTBO

GL_ARB_texture_buffer_object (on desktop OpenGL - since 3.1 or as extension GL_ARB_texture_buffer_object; on OpenGL ES - since 3.2)

◆ arbTboRGB32

Standard_Boolean OpenGl_Context::arbTboRGB32

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

◆ arbTexBindless

OpenGl_ArbTexBindless* OpenGl_Context::arbTexBindless

GL_ARB_bindless_texture.

◆ arbTexFloat

Standard_Boolean OpenGl_Context::arbTexFloat

GL_ARB_texture_float (on desktop OpenGL - since 3.0 or as extension GL_ARB_texture_float; on OpenGL ES - since 3.0);.

See also
hasTexFloatLinear for linear filtering support

◆ arbTexRG

Standard_Boolean OpenGl_Context::arbTexRG

GL_ARB_texture_rg.

◆ atiMem

Standard_Boolean OpenGl_Context::atiMem

GL_ATI_meminfo.

◆ caps

Handle< OpenGl_Caps > OpenGl_Context::caps

context options

◆ core11

OpenGl_GlCore11* OpenGl_Context::core11

OpenGL 1.1 core functionality.

◆ core11fwd

OpenGl_GlCore11Fwd* OpenGl_Context::core11fwd

OpenGL 1.1 without deprecated entry points.

◆ core15

OpenGl_GlCore15* OpenGl_Context::core15

OpenGL 1.5 core functionality.

◆ core15fwd

OpenGl_GlCore15Fwd* OpenGl_Context::core15fwd

OpenGL 1.5 without deprecated entry points.

◆ core20

OpenGl_GlCore20* OpenGl_Context::core20

OpenGL 2.0 core functionality (includes 1.5)

◆ core20fwd

OpenGl_GlCore20Fwd* OpenGl_Context::core20fwd

OpenGL 2.0 without deprecated entry points.

◆ core30

OpenGl_GlCore30* OpenGl_Context::core30

OpenGL 3.0 core functionality.

◆ core30fwd

OpenGl_GlCore30Fwd* OpenGl_Context::core30fwd

OpenGL 3.0 without deprecated entry points.

◆ core32

OpenGl_GlCore32* OpenGl_Context::core32

OpenGL 3.2 core profile.

◆ core32back

OpenGl_GlCore32Back* OpenGl_Context::core32back

OpenGL 3.2 backward compatibility profile.

◆ core33

OpenGl_GlCore33* OpenGl_Context::core33

OpenGL 3.3 core profile.

◆ core33back

OpenGl_GlCore33Back* OpenGl_Context::core33back

OpenGL 3.3 backward compatibility profile.

◆ core41

OpenGl_GlCore41* OpenGl_Context::core41

OpenGL 4.1 core profile.

◆ core41back

OpenGl_GlCore41Back* OpenGl_Context::core41back

OpenGL 4.1 backward compatibility profile.

◆ core42

OpenGl_GlCore42* OpenGl_Context::core42

OpenGL 4.2 core profile.

◆ core42back

OpenGl_GlCore42Back* OpenGl_Context::core42back

OpenGL 4.2 backward compatibility profile.

◆ core43

OpenGl_GlCore43* OpenGl_Context::core43

OpenGL 4.3 core profile.

◆ core43back

OpenGl_GlCore43Back* OpenGl_Context::core43back

OpenGL 4.3 backward compatibility profile.

◆ core44

OpenGl_GlCore44* OpenGl_Context::core44

OpenGL 4.4 core profile.

◆ core44back

OpenGl_GlCore44Back* OpenGl_Context::core44back

OpenGL 4.4 backward compatibility profile.

◆ core45

OpenGl_GlCore45* OpenGl_Context::core45

OpenGL 4.5 core profile.

◆ core45back

OpenGl_GlCore45Back* OpenGl_Context::core45back

OpenGL 4.5 backward compatibility profile.

◆ extAnis

Standard_Boolean OpenGl_Context::extAnis

GL_EXT_texture_filter_anisotropic.

◆ extBgra

Standard_Boolean OpenGl_Context::extBgra

GL_EXT_bgra or GL_EXT_texture_format_BGRA8888 on OpenGL ES.

◆ extDrawBuffers

Standard_Boolean OpenGl_Context::extDrawBuffers

GL_EXT_draw_buffers.

◆ extFragDepth

Standard_Boolean OpenGl_Context::extFragDepth

GL_EXT_frag_depth on OpenGL ES 2.0 (gl_FragDepthEXT built-in variable, before OpenGL ES 3.0)

◆ extGS

OpenGl_ExtGS* OpenGl_Context::extGS

GL_EXT_geometry_shader4.

◆ extPDS

Standard_Boolean OpenGl_Context::extPDS

GL_EXT_packed_depth_stencil.

◆ hasDrawBuffers

OpenGl_FeatureFlag OpenGl_Context::hasDrawBuffers

Complex flag indicating support of multiple draw buffers (desktop OpenGL 2.0, OpenGL ES 3.0, GL_ARB_draw_buffers, GL_EXT_draw_buffers)

◆ hasFboSRGB

Standard_Boolean OpenGl_Context::hasFboSRGB

sRGB FBO render targets (desktop OpenGL 2.1, OpenGL ES 3.0)

◆ hasFlatShading

OpenGl_FeatureFlag OpenGl_Context::hasFlatShading

Complex flag indicating support of Flat shading (Graphic3d_TOSM_FACET) (always available on desktop; on OpenGL ES - since 3.0 or as extension GL_OES_standard_derivatives)

◆ hasFloatBuffer

OpenGl_FeatureFlag OpenGl_Context::hasFloatBuffer

Complex flag indicating support of float color buffer format (desktop OpenGL 3.0, GL_ARB_color_buffer_float, GL_EXT_color_buffer_float)

◆ hasGeometryStage

OpenGl_FeatureFlag OpenGl_Context::hasGeometryStage

Complex flag indicating support of Geometry shader (desktop OpenGL 3.2, OpenGL ES 3.2, GL_EXT_geometry_shader)

◆ hasGetBufferData

Standard_Boolean OpenGl_Context::hasGetBufferData

flag indicating if GetBufferSubData() is supported

◆ hasGlslBitwiseOps

OpenGl_FeatureFlag OpenGl_Context::hasGlslBitwiseOps

GLSL supports bitwise operations; OpenGL 3.0 / OpenGL ES 3.0 (GLSL 130 / GLSL ES 300) or OpenGL 2.1 + GL_EXT_gpu_shader4.

◆ hasHalfFloatBuffer

OpenGl_FeatureFlag OpenGl_Context::hasHalfFloatBuffer

Complex flag indicating support of half-float color buffer format (desktop OpenGL 3.0, GL_ARB_color_buffer_float, GL_EXT_color_buffer_half_float)

◆ hasHighp

Standard_Boolean OpenGl_Context::hasHighp

highp in GLSL ES fragment shader is supported

◆ hasSampleVariables

OpenGl_FeatureFlag OpenGl_Context::hasSampleVariables

Complex flag indicating support of MSAA variables in GLSL shader (desktop OpenGL 4.0, GL_ARB_sample_shading)

◆ hasSRGBControl

Standard_Boolean OpenGl_Context::hasSRGBControl

sRGB write control (any desktop OpenGL, OpenGL ES + GL_EXT_sRGB_write_control extension)

◆ hasTexFloatLinear

Standard_Boolean OpenGl_Context::hasTexFloatLinear

texture-filterable state for 32-bit floating texture formats (always on desktop, GL_OES_texture_float_linear within OpenGL ES)

◆ hasTexRGBA8

Standard_Boolean OpenGl_Context::hasTexRGBA8

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

◆ hasTexSRGB

Standard_Boolean OpenGl_Context::hasTexSRGB

sRGB texture formats (desktop OpenGL 2.1, OpenGL ES 3.0 or GL_EXT_texture_sRGB)

◆ hasUintIndex

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)

◆ ModelWorldState

OpenGl_MatrixState<Standard_ShortReal> OpenGl_Context::ModelWorldState

state of orientation matrix

◆ nvxMem

Standard_Boolean OpenGl_Context::nvxMem

GL_NVX_gpu_memory_info.

◆ oesSampleVariables

Standard_Boolean OpenGl_Context::oesSampleVariables

GL_OES_sample_variables.

◆ oesStdDerivatives

Standard_Boolean OpenGl_Context::oesStdDerivatives

GL_OES_standard_derivatives.

◆ ProjectionState

OpenGl_MatrixState<Standard_ShortReal> OpenGl_Context::ProjectionState

state of projection matrix

◆ WorldViewState

OpenGl_MatrixState<Standard_ShortReal> OpenGl_Context::WorldViewState

state of orientation matrix


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