1 // Created on: 2012-01-26
2 // Created by: Kirill GAVRILOV
3 // Copyright (c) 2012-2014 OPEN CASCADE SAS
5 // This file is part of Open CASCADE Technology software library.
7 // This library is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU Lesser General Public License version 2.1 as published
9 // by the Free Software Foundation, with special exception defined in the file
10 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11 // distribution for complete text of the license and disclaimer of any warranty.
13 // Alternatively, this file may be used under the terms of Open CASCADE
14 // commercial license or contractual agreement.
16 #ifndef _OpenGl_Context_H__
17 #define _OpenGl_Context_H__
19 #include <Aspect_Handle.hxx>
20 #include <Aspect_Drawable.hxx>
21 #include <Aspect_Display.hxx>
22 #include <Aspect_RenderingContext.hxx>
23 #include <Handle_OpenGl_Context.hxx>
24 #include <Handle_OpenGl_FrameBuffer.hxx>
25 #include <Handle_OpenGl_Sampler.hxx>
26 #include <Handle_OpenGl_ShaderManager.hxx>
27 #include <Handle_OpenGl_ShaderProgram.hxx>
28 #include <NCollection_DataMap.hxx>
29 #include <NCollection_Map.hxx>
30 #include <NCollection_Handle.hxx>
31 #include <NCollection_List.hxx>
32 #include <Message.hxx>
33 #include <OpenGl_Caps.hxx>
34 #include <OpenGl_Vec.hxx>
35 #include <OpenGl_Resource.hxx>
36 #include <Standard_Transient.hxx>
37 #include <TCollection_AsciiString.hxx>
38 #include <TColStd_PackedMapOfInteger.hxx>
39 #include <OpenGl_Clipping.hxx>
40 #include <OpenGl_GlCore11.hxx>
41 #include <OpenGl_Utils.hxx>
43 //! Forward declarations
44 #if defined(__APPLE__)
45 #import <TargetConditionals.h>
46 #if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
54 @class NSOpenGLContext;
56 struct NSOpenGLContext;
61 struct OpenGl_GlFunctions;
66 struct OpenGl_ArbFBOBlit;
68 struct OpenGl_ArbTexBindless;
70 template<typename theBaseClass_t> struct OpenGl_TmplCore12;
71 typedef OpenGl_TmplCore12<OpenGl_GlCore11> OpenGl_GlCore12;
72 typedef OpenGl_TmplCore12<OpenGl_GlCore11Fwd> OpenGl_GlCore12Fwd;
74 struct OpenGl_GlCore13;
75 struct OpenGl_GlCore13Fwd;
77 template<typename theBaseClass_t> struct OpenGl_TmplCore14;
78 typedef OpenGl_TmplCore14<OpenGl_GlCore13> OpenGl_GlCore14;
79 typedef OpenGl_TmplCore14<OpenGl_GlCore13Fwd> OpenGl_GlCore14Fwd;
81 template<typename theBaseClass_t> struct OpenGl_TmplCore15;
82 typedef OpenGl_TmplCore15<OpenGl_GlCore14> OpenGl_GlCore15;
83 typedef OpenGl_TmplCore15<OpenGl_GlCore14Fwd> OpenGl_GlCore15Fwd;
85 template<typename theBaseClass_t> struct OpenGl_TmplCore20;
86 typedef OpenGl_TmplCore20<OpenGl_GlCore15> OpenGl_GlCore20;
87 typedef OpenGl_TmplCore20<OpenGl_GlCore15Fwd> OpenGl_GlCore20Fwd;
89 template<typename theBaseClass_t> struct OpenGl_TmplCore21;
90 typedef OpenGl_TmplCore21<OpenGl_GlCore20> OpenGl_GlCore21;
91 typedef OpenGl_TmplCore21<OpenGl_GlCore20Fwd> OpenGl_GlCore21Fwd;
93 template<typename theBaseClass_t> struct OpenGl_TmplCore30;
94 typedef OpenGl_TmplCore30<OpenGl_GlCore21> OpenGl_GlCore30;
95 typedef OpenGl_TmplCore30<OpenGl_GlCore21Fwd> OpenGl_GlCore30Fwd;
97 template<typename theBaseClass_t> struct OpenGl_TmplCore31;
98 typedef OpenGl_TmplCore31<OpenGl_GlCore30> OpenGl_GlCore31Back;
99 typedef OpenGl_TmplCore31<OpenGl_GlCore30Fwd> OpenGl_GlCore31;
101 template<typename theBaseClass_t> struct OpenGl_TmplCore32;
102 typedef OpenGl_TmplCore32<OpenGl_GlCore31Back> OpenGl_GlCore32Back;
103 typedef OpenGl_TmplCore32<OpenGl_GlCore31> OpenGl_GlCore32;
105 template<typename theBaseClass_t> struct OpenGl_TmplCore33;
106 typedef OpenGl_TmplCore33<OpenGl_GlCore32Back> OpenGl_GlCore33Back;
107 typedef OpenGl_TmplCore33<OpenGl_GlCore32> OpenGl_GlCore33;
109 template<typename theBaseClass_t> struct OpenGl_TmplCore40;
110 typedef OpenGl_TmplCore40<OpenGl_GlCore33Back> OpenGl_GlCore40Back;
111 typedef OpenGl_TmplCore40<OpenGl_GlCore33> OpenGl_GlCore40;
113 template<typename theBaseClass_t> struct OpenGl_TmplCore41;
114 typedef OpenGl_TmplCore41<OpenGl_GlCore40Back> OpenGl_GlCore41Back;
115 typedef OpenGl_TmplCore41<OpenGl_GlCore40> OpenGl_GlCore41;
117 template<typename theBaseClass_t> struct OpenGl_TmplCore42;
118 typedef OpenGl_TmplCore42<OpenGl_GlCore41Back> OpenGl_GlCore42Back;
119 typedef OpenGl_TmplCore42<OpenGl_GlCore41> OpenGl_GlCore42;
121 template<typename theBaseClass_t> struct OpenGl_TmplCore43;
122 typedef OpenGl_TmplCore43<OpenGl_GlCore42Back> OpenGl_GlCore43Back;
123 typedef OpenGl_TmplCore43<OpenGl_GlCore42> OpenGl_GlCore43;
125 template<typename theBaseClass_t> struct OpenGl_TmplCore44;
126 typedef OpenGl_TmplCore44<OpenGl_GlCore43Back> OpenGl_GlCore44Back;
127 typedef OpenGl_TmplCore44<OpenGl_GlCore43> OpenGl_GlCore44;
129 //! This class generalize access to the GL context and available extensions.
131 //! Functions related to specific OpenGL version or extension are grouped into structures which can be accessed as fields of this class.
132 //! The most simple way to check that required functionality is available - is NULL check for the group:
134 //! if (myContext->core20 != NULL)
136 //! myGlProgram = myContext->core20->glCreateProgram();
137 //! .. do more stuff ..
141 //! .. compatibility with outdated configurations ..
145 //! Current implementation provide access to OpenGL core functionality up to 4.4 version (core12, core13, core14, core15, fields core20)
146 //! as well as several extensions (arbTBO, arbFBO, etc.).
148 //! OpenGL context might be initialized in Core Profile. In this case deprecated functionality become unavailable.
149 //! To make code easily adaptable to wide range of OpenGL versions, function sets related to each version has two kinds of suffixes:
150 //! - "back" for version 3.2+.
151 //! Represents function set for Backward-Compatible Profile.
152 //! Function sets without this suffix represents core profile.
153 //! - "fwd" for version 3.0-.
154 //! Represents non-deprecated function set of earlier OpenGL versions, which are still available within OpenGL 3.2 Core Profile.
155 //! Function sets without this suffix represents complete list of functions related to specific OpenGL version.
157 //! To select which core** function set should be used in specific case:
158 //! - Determine the minimal OpenGL version required for implemented functionality and use it to access all functions.
159 //! For example, if algorithm requires OpenGL 2.1+, it is better to write core20fwd->glEnable() rather than core11fwd->glEnable() for uniformity.
160 //! - If functionality will work within Core Profile, use function sets with appropriate suffix.
161 //! - Validate minimal requirements at initialization/creation time and omit checks within code where algorithm should be already initialized.
162 //! Properly escape code incompatible with Core Profile. The simplest way to check Core Profile is "if (core11 == NULL)".
164 //! Simplified extensions classification:
165 //! - prefixed with NV, AMD, ATI are vendor-specific (however may be provided by other vendors in some cases);
166 //! - prefixed with EXT are accepted by 2+ vendors;
167 //! - prefixed with ARB are accepted by Architecture Review Board and are candidates
168 //! for inclusion into GL core functionality.
169 //! Some functionality can be represented in several extensions simultaneously.
170 //! In this case developer should be careful because different specification may differ
171 //! in aspects (like enumeration values and error-handling).
173 //! Notice that some systems provide mechanisms to simultaneously incorporate with GL contexts with different capabilities.
174 //! For this reason OpenGl_Context should be initialized and used for each GL context independently.
175 class OpenGl_Context : public Standard_Transient
179 //! Function for getting power of to number larger or equal to input number.
180 //! @param theNumber number to 'power of two'
181 //! @param theThreshold upper threshold
182 //! @return power of two number
183 inline static Standard_Integer GetPowerOfTwo (const Standard_Integer theNumber,
184 const Standard_Integer theThreshold)
186 for (Standard_Integer p2 = 2; p2 <= theThreshold; p2 <<= 1)
198 //! Empty constructor. You should call Init() to perform initialization with bound GL context.
199 Standard_EXPORT OpenGl_Context (const Handle(OpenGl_Caps)& theCaps = NULL);
202 Standard_EXPORT virtual ~OpenGl_Context();
204 //! Release all resources, including shared ones
205 Standard_EXPORT void forcedRelease();
207 //! Share GL context resources.
208 //! theShareCtx - handle to context to retrieve handles to shared resources.
209 Standard_EXPORT void Share (const Handle(OpenGl_Context)& theShareCtx);
211 //! Initialize class from currently bound OpenGL context. Method should be called only once.
212 //! @return false if no GL context is bound to the current thread
213 Standard_EXPORT Standard_Boolean Init (const Standard_Boolean theIsCoreProfile = Standard_False);
215 //! @return true if this context is valid (has been initialized)
216 inline Standard_Boolean IsValid() const
218 return myIsInitialized;
221 #if defined(HAVE_EGL)
222 //! Initialize class from specified surface and rendering context. Method should be called only once.
223 //! @return false if OpenGL context can not be bound to specified surface
224 Standard_EXPORT Standard_Boolean Init (const Aspect_Drawable theEglSurface,
225 const Aspect_Display theEglDisplay,
226 const Aspect_RenderingContext theEglContext,
227 const Standard_Boolean theIsCoreProfile = Standard_False);
228 #elif defined(_WIN32)
229 //! Initialize class from specified window and rendering context. Method should be called only once.
230 //! @return false if OpenGL context can not be bound to specified window
231 Standard_EXPORT Standard_Boolean Init (const Aspect_Handle theWindow,
232 const Aspect_Handle theWindowDC,
233 const Aspect_RenderingContext theGContext,
234 const Standard_Boolean theIsCoreProfile = Standard_False);
236 //! @return the window handle (HWND) currently bound to this OpenGL context
237 inline Aspect_Handle Window() const
242 #elif defined(__APPLE__) && !defined(MACOSX_USE_GLX)
243 #if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
245 //! Initialize class from specified OpenGL ES context (EAGLContext). Method should be called only once.
246 Standard_EXPORT Standard_Boolean Init (EAGLContext* theGContext,
247 const Standard_Boolean theIsCoreProfile = Standard_False);
250 //! Initialize class from specified OpenGL context (NSOpenGLContext). Method should be called only once.
251 Standard_EXPORT Standard_Boolean Init (NSOpenGLContext* theGContext,
252 const Standard_Boolean theIsCoreProfile = Standard_False);
256 //! Initialize class from specified window and rendering context. Method should be called only once.
257 //! @return false if OpenGL context can not be bound to specified window
258 Standard_EXPORT Standard_Boolean Init (const Aspect_Drawable theWindow,
259 const Aspect_Display theDisplay,
260 const Aspect_RenderingContext theGContext,
261 const Standard_Boolean theIsCoreProfile = Standard_False);
263 //! @return the window handle (GLXDrawable) currently bound to this OpenGL context
264 inline Aspect_Drawable Window() const
270 //! Read OpenGL version information from active context.
271 Standard_EXPORT static void ReadGlVersion (Standard_Integer& theGlVerMajor,
272 Standard_Integer& theGlVerMinor);
274 //! Check if theExtName extension is supported by active GL context.
275 Standard_EXPORT Standard_Boolean CheckExtension (const char* theExtName) const;
277 //! Check if theExtName extension is in extensions string.
278 Standard_EXPORT static Standard_Boolean CheckExtension (const char* theExtString,
279 const char* theExtName);
281 //! Auxiliary template to retrieve GL function pointer.
282 //! Pointer to function retrieved from library is statically casted
283 //! to requested type - there no way to check real signature of exported function.
284 //! The context should be bound before call.
285 template <typename FuncType_t>
286 Standard_Boolean FindProc (const char* theFuncName,
287 FuncType_t& theFuncPtr)
289 theFuncPtr = (FuncType_t )findProc (theFuncName);
290 return (theFuncPtr != NULL);
293 //! @return true if detected GL version is greater or equal to requested one.
294 inline Standard_Boolean IsGlGreaterEqual (const Standard_Integer theVerMajor,
295 const Standard_Integer theVerMinor) const
297 return (myGlVerMajor > theVerMajor)
298 || (myGlVerMajor == theVerMajor && myGlVerMinor >= theVerMinor);
301 //! Clean up errors stack for this GL context (glGetError() in loop).
302 Standard_EXPORT void ResetErrors();
304 //! This method uses system-dependent API to retrieve information
305 //! about GL context bound to the current thread.
306 //! @return true if current thread is bound to this GL context
307 Standard_EXPORT Standard_Boolean IsCurrent() const;
309 //! Activates current context.
310 //! Class should be initialized with appropriate info.
311 Standard_EXPORT Standard_Boolean MakeCurrent();
313 //! Swap front/back buffers for this GL context (should be activated before!).
314 Standard_EXPORT void SwapBuffers();
316 //! Return true if active mode is GL_RENDER (cached state)
317 Standard_Boolean IsRender() const
319 #if !defined(GL_ES_VERSION_2_0)
320 return myRenderMode == GL_RENDER;
322 return Standard_True;
326 //! Return true if active mode is GL_FEEDBACK (cached state)
327 Standard_Boolean IsFeedback() const
329 #if !defined(GL_ES_VERSION_2_0)
330 return myRenderMode == GL_FEEDBACK;
332 return Standard_False;
336 //! This function retrieves information from GL about free GPU memory that is:
337 //! - OS-dependent. On some OS it is per-process and on others - for entire system.
338 //! - Vendor-dependent. Currently available only on NVIDIA and AMD/ATi drivers only.
339 //! - Numbers meaning may vary.
340 //! You should use this info only for diagnostics purposes.
341 //! @return free GPU dedicated memory in bytes.
342 Standard_EXPORT Standard_Size AvailableMemory() const;
344 //! This function retrieves information from GL about GPU memory
345 //! and contains more vendor-specific values than AvailableMemory().
346 Standard_EXPORT TCollection_AsciiString MemoryInfo() const;
348 //! Access shared resource by its name.
349 //! @param theKey - unique identifier;
350 //! @return handle to shared resource or NULL.
351 Standard_EXPORT const Handle(OpenGl_Resource)& GetResource (const TCollection_AsciiString& theKey) const;
353 //! Access shared resource by its name.
354 //! @param theKey - unique identifier;
355 //! @param theValue - handle to fill;
356 //! @return true if resource was shared.
357 template<typename TheHandleType>
358 Standard_Boolean GetResource (const TCollection_AsciiString& theKey,
359 TheHandleType& theValue) const
361 const Handle(OpenGl_Resource)& aResource = GetResource (theKey);
362 if (aResource.IsNull())
364 return Standard_False;
367 theValue = TheHandleType::DownCast (aResource);
368 return !theValue.IsNull();
371 //! Register shared resource.
372 //! Notice that after registration caller shouldn't release it by himself -
373 //! it will be automatically released on context destruction.
374 //! @param theKey - unique identifier, shouldn't be empty;
375 //! @param theResource - new resource to register, shouldn't be NULL.
376 Standard_EXPORT Standard_Boolean ShareResource (const TCollection_AsciiString& theKey,
377 const Handle(OpenGl_Resource)& theResource);
379 //! Release shared resource.
380 //! If there are more than one reference to this resource
381 //! (also used by some other existing object) then call will be ignored.
382 //! This means that current object itself should nullify handle before this call.
383 //! Notice that this is unrecommended operation at all and should be used
384 //! only in case of fat resources to release memory for other needs.
385 //! @param theKey unique identifier
386 //! @param theToDelay postpone release until next redraw call
387 Standard_EXPORT void ReleaseResource (const TCollection_AsciiString& theKey,
388 const Standard_Boolean theToDelay = Standard_False);
390 //! Append resource to queue for delayed clean up.
391 //! Resources in this queue will be released at next redraw call.
392 Standard_EXPORT void DelayedRelease (Handle(OpenGl_Resource)& theResource);
394 //! Clean up the delayed release queue.
395 Standard_EXPORT void ReleaseDelayed();
397 //! @return tool for management of clippings within this context.
398 inline OpenGl_Clipping& ChangeClipping() { return myClippingState; }
400 //! @return tool for management of clippings within this context.
401 inline const OpenGl_Clipping& Clipping() const { return myClippingState; }
403 //! @return tool for management of shader programs within this context.
404 inline const Handle(OpenGl_ShaderManager)& ShaderManager() const { return myShaderManager; }
408 //! Either GL_CLAMP_TO_EDGE (1.2+) or GL_CLAMP (1.1).
409 Standard_Integer TextureWrapClamp() const { return myTexClamp; }
411 //! @return maximum degree of anisotropy texture filter
412 Standard_EXPORT Standard_Integer MaxDegreeOfAnisotropy() const;
414 //! @return value for GL_MAX_TEXTURE_SIZE
415 Standard_EXPORT Standard_Integer MaxTextureSize() const;
417 //! Get maximum number of clip planes supported by OpenGl.
418 //! This value is implementation dependent. At least 6
419 //! planes should be supported by OpenGl (see specs).
420 //! @return value for GL_MAX_CLIP_PLANES
421 Standard_EXPORT Standard_Integer MaxClipPlanes() const;
423 //! Returns true if VBO is supported and permitted.
424 inline bool ToUseVbo() const
426 return core15fwd != NULL
427 && !caps->vboDisable;
430 //! @return cached state of GL_NORMALIZE.
431 Standard_Boolean IsGlNormalizeEnabled() const { return myIsGlNormalizeEnabled; }
433 //! Sets GL_NORMALIZE enabled or disabled.
434 //! @return old value of the flag
435 Standard_EXPORT Standard_Boolean SetGlNormalizeEnabled (Standard_Boolean isEnabled);
437 //! Applies matrix stored in ModelWorldState to OpenGl.
438 void ApplyModelWorldMatrix();
440 //! Applies matrix stored in WorldViewState to OpenGl.
441 void ApplyWorldViewMatrix();
443 //! Applies combination of matrices stored in ModelWorldState and WorldViewState to OpenGl.
444 void ApplyModelViewMatrix();
446 //! Applies matrix stored in ProjectionState to OpenGl.
447 void ApplyProjectionMatrix();
451 //! @return messenger instance
452 inline const Handle(Message_Messenger)& Messenger() const
454 return ::Message::DefaultMessenger();
457 //! Callback for GL_ARB_debug_output extension
458 //! @param theSource message source within GL_DEBUG_SOURCE_ enumeration
459 //! @param theType message type within GL_DEBUG_TYPE_ enumeration
460 //! @param theId message ID within source
461 //! @param theSeverity message severity within GL_DEBUG_SEVERITY_ enumeration
462 //! @param theMessage the message itself
463 Standard_EXPORT void PushMessage (const unsigned int theSource,
464 const unsigned int theType,
465 const unsigned int theId,
466 const unsigned int theSeverity,
467 const TCollection_ExtendedString& theMessage);
469 //! Adds a filter for messages with theId and theSource (GL_DEBUG_SOURCE_)
470 Standard_EXPORT Standard_Boolean ExcludeMessage (const unsigned int theSource,
471 const unsigned int theId);
473 //! Removes a filter for messages with theId and theSource (GL_DEBUG_SOURCE_)
474 Standard_EXPORT Standard_Boolean IncludeMessage (const unsigned int theSource,
475 const unsigned int theId);
477 //! @return true if OpenGl context supports left and
478 //! right rendering buffers.
479 Standard_Boolean HasStereoBuffers() const
481 #if !defined(GL_ES_VERSION_2_0)
482 return myIsStereoBuffers;
484 return Standard_False;
488 public: //! @name methods to alter or retrieve current state
490 //! Return active read buffer.
491 Standard_Integer ReadBuffer() { return myReadBuffer; }
493 //! Switch read buffer, wrapper for ::glReadBuffer().
494 Standard_EXPORT void SetReadBuffer (const Standard_Integer theReadBuffer);
496 //! Return active draw buffer.
497 Standard_Integer DrawBuffer() { return myDrawBuffer; }
499 //! Switch draw buffer, wrapper for ::glDrawBuffer().
500 Standard_EXPORT void SetDrawBuffer (const Standard_Integer theDrawBuffer);
502 //! Switch read/draw buffers.
503 void SetReadDrawBuffer (const Standard_Integer theBuffer)
505 SetReadBuffer (theBuffer);
506 SetDrawBuffer (theBuffer);
509 //! Fetch OpenGl context state. This class tracks value of several OpenGl
510 //! state variables. Consulting the cached values is quicker than
511 //! doing the same via OpenGl API. Call this method if any of the controlled
512 //! OpenGl state variables has a possibility of being out-of-date.
513 Standard_EXPORT void FetchState();
515 //! @return active GLSL program
516 const Handle(OpenGl_ShaderProgram)& ActiveProgram() const
518 return myActiveProgram;
521 //! @return OpenGL sampler object used to override default texture parameters
522 const Handle(OpenGl_Sampler)& TextureSampler()
527 //! Bind specified program to current context,
528 //! or unbind previous one when NULL specified.
529 //! @return true if some program is bound to context
530 Standard_EXPORT Standard_Boolean BindProgram (const Handle(OpenGl_ShaderProgram)& theProgram);
532 //! Setup current color.
533 Standard_EXPORT void SetColor4fv (const OpenGl_Vec4& theColor);
535 //! Setup point size.
536 Standard_EXPORT void SetPointSize (const Standard_ShortReal theSize);
538 //! Bind default Vertex Array Object
539 Standard_EXPORT void BindDefaultVao();
541 //! Default Frame Buffer Object.
542 const Handle(OpenGl_FrameBuffer)& DefaultFrameBuffer() const
547 //! Setup new Default Frame Buffer Object and return previously set.
548 //! This call doesn't change Active FBO!
549 Standard_EXPORT Handle(OpenGl_FrameBuffer) SetDefaultFrameBuffer (const Handle(OpenGl_FrameBuffer)& theFbo);
551 //! Return debug context initialization state.
552 Standard_Boolean IsDebugContext() const
554 return myIsGlDebugCtx;
559 //! Wrapper to system function to retrieve GL function pointer by name.
560 Standard_EXPORT void* findProc (const char* theFuncName);
562 //! Print error if not all functions have been exported by context for reported version.
563 //! Note that this will never happen when using GLX, since returned functions can not be validated.
564 //! @param theGlVerMajor the OpenGL major version with missing functions
565 //! @param theGlVerMinor the OpenGL minor version with missing functions
566 Standard_EXPORT void checkWrongVersion (const Standard_Integer theGlVerMajor,
567 const Standard_Integer theGlVerMinor);
569 //! Private initialization function that should be called only once.
570 Standard_EXPORT void init (const Standard_Boolean theIsCoreProfile);
572 public: //! @name core profiles
574 OpenGl_GlCore11* core11; //!< OpenGL 1.1 core functionality
575 OpenGl_GlCore11Fwd* core11fwd; //!< OpenGL 1.1 without deprecated entry points
576 OpenGl_GlCore15* core15; //!< OpenGL 1.5 core functionality
577 OpenGl_GlCore15Fwd* core15fwd; //!< OpenGL 1.5 without deprecated entry points
578 OpenGl_GlCore20* core20; //!< OpenGL 2.0 core functionality (includes 1.5)
579 OpenGl_GlCore20Fwd* core20fwd; //!< OpenGL 2.0 without deprecated entry points
580 OpenGl_GlCore32* core32; //!< OpenGL 3.2 core profile
581 OpenGl_GlCore32Back* core32back; //!< OpenGL 3.2 backward compatibility profile
582 OpenGl_GlCore33* core33; //!< OpenGL 3.3 core profile
583 OpenGl_GlCore33Back* core33back; //!< OpenGL 3.3 backward compatibility profile
584 OpenGl_GlCore41* core41; //!< OpenGL 4.1 core profile
585 OpenGl_GlCore41Back* core41back; //!< OpenGL 4.1 backward compatibility profile
586 OpenGl_GlCore42* core42; //!< OpenGL 4.2 core profile
587 OpenGl_GlCore42Back* core42back; //!< OpenGL 4.2 backward compatibility profile
588 OpenGl_GlCore43* core43; //!< OpenGL 4.3 core profile
589 OpenGl_GlCore43Back* core43back; //!< OpenGL 4.3 backward compatibility profile
590 OpenGl_GlCore44* core44; //!< OpenGL 4.4 core profile
591 OpenGl_GlCore44Back* core44back; //!< OpenGL 4.4 backward compatibility profile
593 Handle(OpenGl_Caps) caps; //!< context options
595 public: //! @name extensions
597 Standard_Boolean hasHighp; //!< highp in GLSL ES fragment shader is supported
598 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)
599 Standard_Boolean hasTexRGBA8; //!< always available on desktop; on OpenGL ES - since 3.0 or as extension GL_OES_rgb8_rgba8
600 Standard_Boolean arbNPTW; //!< GL_ARB_texture_non_power_of_two
601 Standard_Boolean arbTexRG; //!< GL_ARB_texture_rg
602 OpenGl_ArbTexBindless* arbTexBindless; //!< GL_ARB_bindless_texture
603 OpenGl_ArbTBO* arbTBO; //!< GL_ARB_texture_buffer_object
604 Standard_Boolean arbTboRGB32; //!< GL_ARB_texture_buffer_object_rgb32 (3-component TBO), in core since 4.0
605 OpenGl_ArbIns* arbIns; //!< GL_ARB_draw_instanced
606 OpenGl_ArbDbg* arbDbg; //!< GL_ARB_debug_output
607 OpenGl_ArbFBO* arbFBO; //!< GL_ARB_framebuffer_object
608 OpenGl_ArbFBOBlit* arbFBOBlit; //!< glBlitFramebuffer function, moved out from OpenGl_ArbFBO structure for compatibility with OpenGL ES 2.0
609 OpenGl_ExtGS* extGS; //!< GL_EXT_geometry_shader4
610 Standard_Boolean extBgra; //!< GL_EXT_bgra or GL_EXT_texture_format_BGRA8888 on OpenGL ES
611 Standard_Boolean extAnis; //!< GL_EXT_texture_filter_anisotropic
612 Standard_Boolean extPDS; //!< GL_EXT_packed_depth_stencil
613 Standard_Boolean atiMem; //!< GL_ATI_meminfo
614 Standard_Boolean nvxMem; //!< GL_NVX_gpu_memory_info
616 private: // system-dependent fields
618 #if defined(HAVE_EGL)
619 Aspect_Drawable myWindow; //!< EGL surface : EGLSurface
620 Aspect_Display myDisplay; //!< EGL connection to the Display : EGLDisplay
621 Aspect_RenderingContext myGContext; //!< EGL rendering context : EGLContext
622 #elif defined(_WIN32)
623 Aspect_Handle myWindow; //!< window handle (owner of GL context) : HWND
624 Aspect_Handle myWindowDC; //!< Device Descriptor handle : HDC
625 Aspect_RenderingContext myGContext; //!< Rendering Context handle : HGLRC
626 #elif defined(__APPLE__) && !defined(MACOSX_USE_GLX)
627 #if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
628 EAGLContext* myGContext; //!< Rendering Context handle
630 NSOpenGLContext* myGContext; //!< Rendering Context handle
633 Aspect_Drawable myWindow; //!< window handle (owner of GL context) : GLXDrawable
634 Aspect_Display myDisplay; //!< connection to the X-server : Display*
635 Aspect_RenderingContext myGContext; //!< X-GLX rendering context : GLXContext
638 private: // context info
640 typedef NCollection_DataMap<TCollection_AsciiString, Standard_Integer> OpenGl_DelayReleaseMap;
641 typedef NCollection_Handle<OpenGl_DelayReleaseMap> Handle(OpenGl_DelayReleaseMap);
642 typedef NCollection_DataMap<TCollection_AsciiString, Handle(OpenGl_Resource)> OpenGl_ResourcesMap;
643 typedef NCollection_Handle<OpenGl_ResourcesMap> Handle(OpenGl_ResourcesMap);
644 typedef NCollection_List<Handle(OpenGl_Resource)> OpenGl_ResourcesStack;
645 typedef NCollection_Handle<OpenGl_ResourcesStack> Handle(OpenGl_ResourcesStack);
647 Handle(OpenGl_ResourcesMap) mySharedResources; //!< shared resources with unique identification key
648 Handle(OpenGl_DelayReleaseMap) myDelayed; //!< shared resources for delayed release
649 Handle(OpenGl_ResourcesStack) myUnusedResources; //!< stack of resources for delayed clean up
651 OpenGl_Clipping myClippingState; //!< state of clip planes
653 void* myGlLibHandle; //!< optional handle to GL library
654 NCollection_Handle<OpenGl_GlFunctions>
655 myFuncs; //!< mega structure for all GL functions
656 Standard_Integer myAnisoMax; //!< maximum level of anisotropy texture filter
657 Standard_Integer myTexClamp; //!< either GL_CLAMP_TO_EDGE (1.2+) or GL_CLAMP (1.1)
658 Standard_Integer myMaxTexDim; //!< value for GL_MAX_TEXTURE_SIZE
659 Standard_Integer myMaxClipPlanes; //!< value for GL_MAX_CLIP_PLANES
660 Standard_Integer myGlVerMajor; //!< cached GL version major number
661 Standard_Integer myGlVerMinor; //!< cached GL version minor number
662 Standard_Boolean myIsInitialized; //!< flag indicates initialization state
663 Standard_Boolean myIsStereoBuffers; //!< context supports stereo buffering
664 Standard_Boolean myIsGlNormalizeEnabled; //!< GL_NORMALIZE flag
665 //!< Used to tell OpenGl that normals should be normalized
667 Handle(OpenGl_ShaderManager) myShaderManager; //! support object for managing shader programs
669 private: //! @name fields tracking current state
671 Handle(OpenGl_ShaderProgram) myActiveProgram; //!< currently active GLSL program
672 Handle(OpenGl_Sampler) myTexSampler; //!< currently active sampler object
673 Handle(OpenGl_FrameBuffer) myDefaultFbo; //!< default Frame Buffer Object
674 Standard_Integer myRenderMode; //!< value for active rendering mode
675 Standard_Integer myReadBuffer; //!< current read buffer
676 Standard_Integer myDrawBuffer; //!< current draw buffer
677 unsigned int myDefaultVao; //!< default Vertex Array Object
678 Standard_Boolean myIsGlDebugCtx; //!< debug context initialization state
679 TCollection_AsciiString myVendor; //!< Graphics Driver's vendor
680 TColStd_PackedMapOfInteger myFilters[6]; //!< messages suppressing filter (for sources from GL_DEBUG_SOURCE_API_ARB to GL_DEBUG_SOURCE_OTHER_ARB)
684 OpenGl_Utils::MatrixState<Standard_ShortReal> ModelWorldState; //!< state of orientation matrix
685 OpenGl_Utils::MatrixState<Standard_ShortReal> WorldViewState; //!< state of orientation matrix
686 OpenGl_Utils::MatrixState<Standard_ShortReal> ProjectionState; //!< state of projection matrix
690 //! Copying allowed only within Handles
691 OpenGl_Context (const OpenGl_Context& );
692 OpenGl_Context& operator= (const OpenGl_Context& );
696 DEFINE_STANDARD_RTTI(OpenGl_Context) // Type definition
698 friend class OpenGl_Window;
702 #endif // _OpenGl_Context_H__