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.
20 #include <OpenGl_Context.hxx>
22 #include <OpenGl_ArbTBO.hxx>
23 #include <OpenGl_ArbIns.hxx>
24 #include <OpenGl_ArbDbg.hxx>
25 #include <OpenGl_ArbFBO.hxx>
26 #include <OpenGl_ExtGS.hxx>
27 #include <OpenGl_GlCore20.hxx>
28 #include <OpenGl_ShaderManager.hxx>
30 #include <Message_Messenger.hxx>
32 #include <NCollection_Vector.hxx>
34 #include <Standard_ProgramError.hxx>
38 #elif defined(__APPLE__) && !defined(MACOSX_USE_GLX)
41 #include <GL/glx.h> // glXGetProcAddress()
44 // GL_NVX_gpu_memory_info
45 #ifndef GL_GPU_MEMORY_INFO_DEDICATED_VIDMEM_NVX
48 GL_GPU_MEMORY_INFO_DEDICATED_VIDMEM_NVX = 0x9047,
49 GL_GPU_MEMORY_INFO_TOTAL_AVAILABLE_MEMORY_NVX = 0x9048,
50 GL_GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX = 0x9049,
51 GL_GPU_MEMORY_INFO_EVICTION_COUNT_NVX = 0x904A,
52 GL_GPU_MEMORY_INFO_EVICTED_MEMORY_NVX = 0x904B
56 IMPLEMENT_STANDARD_HANDLE (OpenGl_Context, Standard_Transient)
57 IMPLEMENT_STANDARD_RTTIEXT(OpenGl_Context, Standard_Transient)
61 static const Handle(OpenGl_Resource) NULL_GL_RESOURCE;
64 // =======================================================================
65 // function : OpenGl_Context
67 // =======================================================================
68 OpenGl_Context::OpenGl_Context (const Handle(OpenGl_Caps)& theCaps)
85 caps (!theCaps.IsNull() ? theCaps : new OpenGl_Caps()),
86 arbNPTW(Standard_False),
92 extBgra(Standard_False),
93 extAnis(Standard_False),
94 extPDS (Standard_False),
95 atiMem (Standard_False),
96 nvxMem (Standard_False),
97 mySharedResources (new OpenGl_ResourcesMap()),
98 myDelayed (new OpenGl_DelayReleaseMap()),
99 myReleaseQueue (new OpenGl_ResourcesQueue()),
101 myGlLibHandle (NULL),
102 myFuncs (new OpenGl_GlFunctions()),
108 myRenderMode (GL_RENDER),
109 myIsInitialized (Standard_False),
110 myIsStereoBuffers (Standard_False),
113 #if defined(MAC_OS_X_VERSION_10_3) && !defined(MACOSX_USE_GLX)
114 // Vendors can not extend functionality on this system
115 // and developers are limited to OpenGL support provided by Mac OS X SDK.
116 // We retrieve function pointers from system library
117 // to generalize extensions support on all platforms.
118 // In this way we also reach binary compatibility benefit between OS releases
119 // if some newest functionality is optionally used.
120 // Notice that GL version / extension availability checks are required
121 // because function pointers may be available but not functionality itself
122 // (depends on renderer).
123 myGlLibHandle = dlopen ("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", RTLD_LAZY);
125 memset (myFuncs.operator->(), 0, sizeof(OpenGl_GlFunctions));
126 myShaderManager = new OpenGl_ShaderManager (this);
129 // =======================================================================
130 // function : ~OpenGl_Context
132 // =======================================================================
133 OpenGl_Context::~OpenGl_Context()
135 // release clean up queue
138 // release shared resources if any
139 if (((const Handle(Standard_Transient)& )mySharedResources)->GetRefCount() <= 1)
141 myShaderManager.Nullify();
142 for (NCollection_DataMap<TCollection_AsciiString, Handle(OpenGl_Resource)>::Iterator anIter (*mySharedResources);
143 anIter.More(); anIter.Next())
145 anIter.Value()->Release (this);
150 myShaderManager->SetContext (NULL);
152 mySharedResources.Nullify();
156 && caps->contextDebug
161 glGetPointerv (GL_DEBUG_CALLBACK_USER_PARAM_ARB, &aPtr);
164 arbDbg->glDebugMessageCallbackARB (NULL, NULL);
169 // =======================================================================
170 // function : MaxDegreeOfAnisotropy
172 // =======================================================================
173 Standard_Integer OpenGl_Context::MaxDegreeOfAnisotropy() const
178 // =======================================================================
179 // function : MaxTextureSize
181 // =======================================================================
182 Standard_Integer OpenGl_Context::MaxTextureSize() const
187 // =======================================================================
188 // function : MaxClipPlanes
190 // =======================================================================
191 Standard_Integer OpenGl_Context::MaxClipPlanes() const
193 return myMaxClipPlanes;
196 // =======================================================================
197 // function : SetDrawBufferLeft
199 // =======================================================================
200 void OpenGl_Context::SetDrawBufferLeft()
202 switch (myDrawBuffer)
206 glDrawBuffer (GL_BACK_LEFT);
207 myDrawBuffer = GL_BACK_LEFT;
210 case GL_FRONT_RIGHT :
212 glDrawBuffer (GL_FRONT_LEFT);
213 myDrawBuffer = GL_FRONT_LEFT;
216 case GL_FRONT_AND_BACK :
218 glDrawBuffer (GL_LEFT);
219 myDrawBuffer = GL_LEFT;
224 // =======================================================================
225 // function : SetDrawBufferRight
227 // =======================================================================
228 void OpenGl_Context::SetDrawBufferRight()
230 switch (myDrawBuffer)
234 glDrawBuffer (GL_BACK_RIGHT);
235 myDrawBuffer = GL_BACK_RIGHT;
240 glDrawBuffer (GL_FRONT_RIGHT);
241 myDrawBuffer = GL_FRONT_RIGHT;
244 case GL_FRONT_AND_BACK :
246 glDrawBuffer (GL_RIGHT);
247 myDrawBuffer = GL_RIGHT;
252 // =======================================================================
253 // function : SetDrawBufferMono
255 // =======================================================================
256 void OpenGl_Context::SetDrawBufferMono()
258 switch (myDrawBuffer)
262 glDrawBuffer (GL_BACK);
263 myDrawBuffer = GL_BACK;
267 case GL_FRONT_RIGHT :
268 glDrawBuffer (GL_FRONT);
269 myDrawBuffer = GL_FRONT;
274 glDrawBuffer (GL_FRONT_AND_BACK);
275 myDrawBuffer = GL_FRONT_AND_BACK;
280 // =======================================================================
281 // function : FetchState
283 // =======================================================================
284 void OpenGl_Context::FetchState()
286 // cache feedback mode state
287 glGetIntegerv (GL_RENDER_MODE, &myRenderMode);
289 // cache draw buffer state
290 glGetIntegerv (GL_DRAW_BUFFER, &myDrawBuffer);
293 // =======================================================================
296 // =======================================================================
297 void OpenGl_Context::Share (const Handle(OpenGl_Context)& theShareCtx)
299 if (!theShareCtx.IsNull())
301 mySharedResources = theShareCtx->mySharedResources;
302 myDelayed = theShareCtx->myDelayed;
303 myReleaseQueue = theShareCtx->myReleaseQueue;
304 myShaderManager = theShareCtx->myShaderManager;
308 #if !defined(__APPLE__) || defined(MACOSX_USE_GLX)
310 // =======================================================================
311 // function : IsCurrent
313 // =======================================================================
314 Standard_Boolean OpenGl_Context::IsCurrent() const
317 if (myWindowDC == NULL || myGContext == NULL)
319 return Standard_False;
321 return (( (HDC )myWindowDC == wglGetCurrentDC())
322 && ((HGLRC )myGContext == wglGetCurrentContext()));
324 if (myDisplay == NULL || myWindow == 0 || myGContext == 0)
326 return Standard_False;
329 return ( ((Display* )myDisplay == glXGetCurrentDisplay())
330 && ((GLXContext )myGContext == glXGetCurrentContext())
331 && ((GLXDrawable )myWindow == glXGetCurrentDrawable()));
335 // =======================================================================
336 // function : MakeCurrent
338 // =======================================================================
339 Standard_Boolean OpenGl_Context::MakeCurrent()
342 if (myWindowDC == NULL || myGContext == NULL)
344 Standard_ProgramError_Raise_if (myIsInitialized, "OpenGl_Context::Init() should be called before!");
345 return Standard_False;
348 // technically it should be safe to activate already bound GL context
349 // however some drivers (Intel etc.) may FAIL doing this for unknown reason
352 myShaderManager->SetContext (this);
353 return Standard_True;
355 else if (wglMakeCurrent ((HDC )myWindowDC, (HGLRC )myGContext) != TRUE)
357 // notice that glGetError() couldn't be used here!
358 wchar_t* aMsgBuff = NULL;
359 DWORD anErrorCode = GetLastError();
360 FormatMessageW (FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
361 NULL, anErrorCode, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (wchar_t* )&aMsgBuff, 0, NULL);
362 TCollection_ExtendedString aMsg ("wglMakeCurrent() has failed. ");
363 if (aMsgBuff != NULL)
365 aMsg += (Standard_ExtString )aMsgBuff;
366 LocalFree (aMsgBuff);
368 PushMessage (GL_DEBUG_SOURCE_WINDOW_SYSTEM_ARB, GL_DEBUG_TYPE_ERROR_ARB, (unsigned int )anErrorCode, GL_DEBUG_SEVERITY_HIGH_ARB, aMsg);
369 myIsInitialized = Standard_False;
370 return Standard_False;
373 if (myDisplay == NULL || myWindow == 0 || myGContext == 0)
375 Standard_ProgramError_Raise_if (myIsInitialized, "OpenGl_Context::Init() should be called before!");
376 return Standard_False;
379 if (!glXMakeCurrent ((Display* )myDisplay, (GLXDrawable )myWindow, (GLXContext )myGContext))
381 // if there is no current context it might be impossible to use glGetError() correctly
382 PushMessage (GL_DEBUG_SOURCE_WINDOW_SYSTEM_ARB, GL_DEBUG_TYPE_ERROR_ARB, 0, GL_DEBUG_SEVERITY_HIGH_ARB,
383 "glXMakeCurrent() has failed!");
384 myIsInitialized = Standard_False;
385 return Standard_False;
388 myShaderManager->SetContext (this);
389 return Standard_True;
392 // =======================================================================
393 // function : SwapBuffers
395 // =======================================================================
396 void OpenGl_Context::SwapBuffers()
399 if ((HDC )myWindowDC != NULL)
401 ::SwapBuffers ((HDC )myWindowDC);
405 if ((Display* )myDisplay != NULL)
407 glXSwapBuffers ((Display* )myDisplay, (GLXDrawable )myWindow);
414 // =======================================================================
415 // function : findProc
417 // =======================================================================
418 void* OpenGl_Context::findProc (const char* theFuncName)
421 return wglGetProcAddress (theFuncName);
422 #elif defined(__APPLE__) && !defined(MACOSX_USE_GLX)
423 return (myGlLibHandle != NULL) ? dlsym (myGlLibHandle, theFuncName) : NULL;
425 return (void* )glXGetProcAddress ((const GLubyte* )theFuncName);
429 // =======================================================================
430 // function : CheckExtension
432 // =======================================================================
433 Standard_Boolean OpenGl_Context::CheckExtension (const char* theExtName) const
435 if (theExtName == NULL)
437 std::cerr << "CheckExtension called with NULL string!\n";
438 return Standard_False;
441 // available since OpenGL 3.0
442 // and the ONLY way to check extensions with OpenGL 3.1+ core profile
443 /**if (IsGlGreaterEqual (3, 0))
446 glGetIntegerv (GL_NUM_EXTENSIONS, &anExtNb);
447 for (GLint anIter = 0; anIter < anExtNb; ++anIter)
449 const char* anExtension = (const char* )core30->glGetStringi (GL_EXTENSIONS, (GLuint )anIter);
450 if (anExtension[anExtNameLen] == '\0' &&
451 strncmp (anExtension, theExtName, anExtNameLen) == 0)
453 return Standard_True;
456 return Standard_False;
459 // use old way with huge string for all extensions
460 const char* anExtString = (const char* )glGetString (GL_EXTENSIONS);
461 if (anExtString == NULL)
463 Messenger()->Send ("TKOpenGL: glGetString (GL_EXTENSIONS) has returned NULL! No GL context?", Message_Warning);
464 return Standard_False;
466 return CheckExtension (anExtString, theExtName);
469 // =======================================================================
470 // function : CheckExtension
472 // =======================================================================
473 Standard_Boolean OpenGl_Context::CheckExtension (const char* theExtString,
474 const char* theExtName)
476 if (theExtString == NULL)
478 return Standard_False;
481 // Search for theExtName in the extensions string.
482 // Use of strstr() is not sufficient because extension names can be prefixes of other extension names.
483 char* aPtrIter = (char* )theExtString;
484 const char* aPtrEnd = aPtrIter + strlen (theExtString);
485 const size_t anExtNameLen = strlen (theExtName);
486 while (aPtrIter < aPtrEnd)
488 const size_t n = strcspn (aPtrIter, " ");
489 if ((n == anExtNameLen) && (strncmp (aPtrIter, theExtName, anExtNameLen) == 0))
491 return Standard_True;
495 return Standard_False;
498 #if !defined(__APPLE__) || defined(MACOSX_USE_GLX)
500 // =======================================================================
503 // =======================================================================
504 Standard_Boolean OpenGl_Context::Init()
508 return Standard_True;
512 myWindowDC = (Aspect_Handle )wglGetCurrentDC();
513 myGContext = (Aspect_RenderingContext )wglGetCurrentContext();
515 myDisplay = (Aspect_Display )glXGetCurrentDisplay();
516 myGContext = (Aspect_RenderingContext )glXGetCurrentContext();
517 myWindow = (Aspect_Drawable )glXGetCurrentDrawable();
519 if (myGContext == NULL)
521 return Standard_False;
525 myIsInitialized = Standard_True;
526 return Standard_True;
531 // =======================================================================
534 // =======================================================================
536 Standard_Boolean OpenGl_Context::Init (const Aspect_Handle theWindow,
537 const Aspect_Handle theWindowDC,
538 const Aspect_RenderingContext theGContext)
539 #elif defined(__APPLE__) && !defined(MACOSX_USE_GLX)
540 Standard_Boolean OpenGl_Context::Init (const void* theGContext)
542 Standard_Boolean OpenGl_Context::Init (const Aspect_Drawable theWindow,
543 const Aspect_Display theDisplay,
544 const Aspect_RenderingContext theGContext)
547 Standard_ProgramError_Raise_if (myIsInitialized, "OpenGl_Context::Init() should be called only once!");
549 myWindow = theWindow;
550 myGContext = theGContext;
551 myWindowDC = theWindowDC;
552 #elif defined(__APPLE__) && !defined(MACOSX_USE_GLX)
553 myGContext = (void* )theGContext;
555 myWindow = theWindow;
556 myGContext = theGContext;
557 myDisplay = theDisplay;
559 if (myGContext == NULL || !MakeCurrent())
561 return Standard_False;
565 myIsInitialized = Standard_True;
566 return Standard_True;
569 // =======================================================================
570 // function : ResetErrors
572 // =======================================================================
573 void OpenGl_Context::ResetErrors()
575 while (glGetError() != GL_NO_ERROR)
581 // =======================================================================
582 // function : readGlVersion
584 // =======================================================================
585 void OpenGl_Context::readGlVersion()
591 // available since OpenGL 3.0
592 GLint aMajor = 0, aMinor = 0;
593 glGetIntegerv (GL_MAJOR_VERSION, &aMajor);
594 glGetIntegerv (GL_MINOR_VERSION, &aMinor);
595 // glGetError() sometimes does not report an error here even if
596 // GL does not know GL_MAJOR_VERSION and GL_MINOR_VERSION constants.
597 // This happens on some rendereres like e.g. Cygwin MESA.
598 // Thus checking additionally if GL has put anything to
599 // the output variables.
600 if (glGetError() == GL_NO_ERROR && aMajor != 0 && aMinor != 0)
602 myGlVerMajor = aMajor;
603 myGlVerMinor = aMinor;
608 // Read version string.
609 // Notice that only first two numbers splitted by point '2.1 XXXXX' are significant.
610 // Following trash (after space) is vendor-specific.
611 // New drivers also returns micro version of GL like '3.3.0' which has no meaning
612 // and should be considered as vendor-specific too.
613 const char* aVerStr = (const char* )glGetString (GL_VERSION);
614 if (aVerStr == NULL || *aVerStr == '\0')
616 // invalid GL context
620 // parse string for major number
624 while (aVerStr[aMajIter] >= '0' && aVerStr[aMajIter] <= '9')
628 if (aMajIter == 0 || aMajIter >= sizeof(aMajorStr))
632 memcpy (aMajorStr, aVerStr, aMajIter);
633 aMajorStr[aMajIter] = '\0';
635 // parse string for minor number
636 aVerStr += aMajIter + 1;
638 while (aVerStr[aMinIter] >= '0' && aVerStr[aMinIter] <= '9')
642 if (aMinIter == 0 || aMinIter >= sizeof(aMinorStr))
646 memcpy (aMinorStr, aVerStr, aMinIter);
647 aMinorStr[aMinIter] = '\0';
650 myGlVerMajor = atoi (aMajorStr);
651 myGlVerMinor = atoi (aMinorStr);
653 if (myGlVerMajor <= 0)
660 static Standard_CString THE_DBGMSG_UNKNOWN = "UNKNOWN";
661 static Standard_CString THE_DBGMSG_SOURCES[] =
663 ".OpenGL", // GL_DEBUG_SOURCE_API_ARB
664 ".WinSystem", // GL_DEBUG_SOURCE_WINDOW_SYSTEM_ARB
665 ".GLSL", // GL_DEBUG_SOURCE_SHADER_COMPILER_ARB
666 ".3rdParty", // GL_DEBUG_SOURCE_THIRD_PARTY_ARB
667 "", // GL_DEBUG_SOURCE_APPLICATION_ARB
668 ".Other" // GL_DEBUG_SOURCE_OTHER_ARB
671 static Standard_CString THE_DBGMSG_TYPES[] =
673 "Error", // GL_DEBUG_TYPE_ERROR_ARB
674 "Deprecated", // GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR_ARB
675 "Undef. behavior", // GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR_ARB
676 "Portability", // GL_DEBUG_TYPE_PORTABILITY_ARB
677 "Performance", // GL_DEBUG_TYPE_PERFORMANCE_ARB
678 "Other" // GL_DEBUG_TYPE_OTHER_ARB
681 static Standard_CString THE_DBGMSG_SEV_HIGH = "High"; // GL_DEBUG_SEVERITY_HIGH_ARB
682 static Standard_CString THE_DBGMSG_SEV_MEDIUM = "Medium"; // GL_DEBUG_SEVERITY_MEDIUM_ARB
683 static Standard_CString THE_DBGMSG_SEV_LOW = "Low"; // GL_DEBUG_SEVERITY_LOW_ARB
685 //! Callback for GL_ARB_debug_output extension
686 static void APIENTRY debugCallbackWrap(unsigned int theSource,
687 unsigned int theType,
689 unsigned int theSeverity,
691 const char* theMessage,
692 const void* theUserParam)
694 OpenGl_Context* aCtx = (OpenGl_Context* )theUserParam;
695 aCtx->PushMessage (theSource, theType, theId, theSeverity, theMessage);
698 // =======================================================================
699 // function : PushMessage
701 // =======================================================================
702 void OpenGl_Context::PushMessage (const unsigned int theSource,
703 const unsigned int theType,
704 const unsigned int theId,
705 const unsigned int theSeverity,
706 const TCollection_ExtendedString& theMessage)
708 //OpenGl_Context* aCtx = (OpenGl_Context* )theUserParam;
709 Standard_CString& aSrc = (theSource >= GL_DEBUG_SOURCE_API_ARB
710 && theSource <= GL_DEBUG_SOURCE_OTHER_ARB)
711 ? THE_DBGMSG_SOURCES[theSource - GL_DEBUG_SOURCE_API_ARB]
712 : THE_DBGMSG_UNKNOWN;
713 Standard_CString& aType = (theType >= GL_DEBUG_TYPE_ERROR_ARB
714 && theType <= GL_DEBUG_TYPE_OTHER_ARB)
715 ? THE_DBGMSG_TYPES[theType - GL_DEBUG_TYPE_ERROR_ARB]
716 : THE_DBGMSG_UNKNOWN;
717 Standard_CString& aSev = theSeverity == GL_DEBUG_SEVERITY_HIGH_ARB
718 ? THE_DBGMSG_SEV_HIGH
719 : (theSeverity == GL_DEBUG_SEVERITY_MEDIUM_ARB
720 ? THE_DBGMSG_SEV_MEDIUM
721 : THE_DBGMSG_SEV_LOW);
722 Message_Gravity aGrav = theSeverity == GL_DEBUG_SEVERITY_HIGH_ARB
724 : (theSeverity == GL_DEBUG_SEVERITY_MEDIUM_ARB
728 TCollection_ExtendedString aMsg;
729 aMsg += "TKOpenGl"; aMsg += aSrc;
730 aMsg += " | Type: "; aMsg += aType;
731 aMsg += " | ID: "; aMsg += (Standard_Integer )theId;
732 aMsg += " | Severity: "; aMsg += aSev;
733 aMsg += " | Message:\n ";
736 Messenger()->Send (aMsg, aGrav);
739 // =======================================================================
742 // =======================================================================
743 void OpenGl_Context::init()
748 core11 = (OpenGl_GlCore11* )(&(*myFuncs));
749 core11fwd = (OpenGl_GlCore11Fwd* )(&(*myFuncs));
770 arbNPTW = CheckExtension ("GL_ARB_texture_non_power_of_two");
771 extBgra = CheckExtension ("GL_EXT_bgra");
772 extAnis = CheckExtension ("GL_EXT_texture_filter_anisotropic");
773 extPDS = CheckExtension ("GL_EXT_packed_depth_stencil");
774 atiMem = CheckExtension ("GL_ATI_meminfo");
775 nvxMem = CheckExtension ("GL_NVX_gpu_memory_info");
777 // get number of maximum clipping planes
778 glGetIntegerv (GL_MAX_CLIP_PLANES, &myMaxClipPlanes);
779 glGetIntegerv (GL_MAX_TEXTURE_SIZE, &myMaxTexDim);
782 glGetIntegerv (GL_STEREO, &aStereo);
783 myIsStereoBuffers = aStereo == 1;
787 glGetIntegerv (GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &myAnisoMax);
790 myClippingState.Init (myMaxClipPlanes);
808 //! Make record shorter to retrieve function pointer using variable with same name
809 #define FindProcShort(theFunc) FindProc(#theFunc, myFuncs->theFunc)
811 // retrieve platform-dependent extensions
813 if (FindProcShort (wglGetExtensionsStringARB))
815 const char* aWglExts = myFuncs->wglGetExtensionsStringARB (wglGetCurrentDC());
816 if (CheckExtension (aWglExts, "WGL_EXT_swap_control"))
818 FindProcShort (wglSwapIntervalEXT);
820 if (CheckExtension (aWglExts, "WGL_ARB_pixel_format"))
822 FindProcShort (wglChoosePixelFormatARB);
824 if (CheckExtension (aWglExts, "WGL_ARB_create_context_profile"))
826 FindProcShort (wglCreateContextAttribsARB);
828 if (CheckExtension (aWglExts, "WGL_NV_DX_interop"))
830 FindProcShort (wglDXSetResourceShareHandleNV);
831 FindProcShort (wglDXOpenDeviceNV);
832 FindProcShort (wglDXCloseDeviceNV);
833 FindProcShort (wglDXRegisterObjectNV);
834 FindProcShort (wglDXUnregisterObjectNV);
835 FindProcShort (wglDXObjectAccessNV);
836 FindProcShort (wglDXLockObjectsNV);
837 FindProcShort (wglDXUnlockObjectsNV);
842 // initialize debug context extension
843 if (CheckExtension ("GL_ARB_debug_output"))
846 if (FindProcShort (glDebugMessageControlARB)
847 && FindProcShort (glDebugMessageInsertARB)
848 && FindProcShort (glDebugMessageCallbackARB)
849 && FindProcShort (glGetDebugMessageLogARB))
851 arbDbg = (OpenGl_ArbDbg* )(&(*myFuncs));
854 && caps->contextDebug)
856 // setup default callback
857 arbDbg->glDebugMessageCallbackARB (debugCallbackWrap, this);
859 glEnable (GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB);
864 // load OpenGL 1.2 new functions
865 has12 = IsGlGreaterEqual (1, 2)
866 && FindProcShort (glBlendColor)
867 && FindProcShort (glBlendEquation)
868 && FindProcShort (glDrawRangeElements)
869 && FindProcShort (glTexImage3D)
870 && FindProcShort (glTexSubImage3D)
871 && FindProcShort (glCopyTexSubImage3D);
873 // load OpenGL 1.3 new functions
874 has13 = IsGlGreaterEqual (1, 3)
875 && FindProcShort (glActiveTexture)
876 && FindProcShort (glSampleCoverage)
877 && FindProcShort (glCompressedTexImage3D)
878 && FindProcShort (glCompressedTexImage2D)
879 && FindProcShort (glCompressedTexImage1D)
880 && FindProcShort (glCompressedTexSubImage3D)
881 && FindProcShort (glCompressedTexSubImage2D)
882 && FindProcShort (glCompressedTexSubImage1D)
883 && FindProcShort (glGetCompressedTexImage)
884 && FindProcShort (glClientActiveTexture)
885 && FindProcShort (glMultiTexCoord1d)
886 && FindProcShort (glMultiTexCoord1dv)
887 && FindProcShort (glMultiTexCoord1f)
888 && FindProcShort (glMultiTexCoord1fv)
889 && FindProcShort (glMultiTexCoord1i)
890 && FindProcShort (glMultiTexCoord1iv)
891 && FindProcShort (glMultiTexCoord1s)
892 && FindProcShort (glMultiTexCoord1sv)
893 && FindProcShort (glMultiTexCoord2d)
894 && FindProcShort (glMultiTexCoord2dv)
895 && FindProcShort (glMultiTexCoord2f)
896 && FindProcShort (glMultiTexCoord2fv)
897 && FindProcShort (glMultiTexCoord2i)
898 && FindProcShort (glMultiTexCoord2iv)
899 && FindProcShort (glMultiTexCoord2s)
900 && FindProcShort (glMultiTexCoord2sv)
901 && FindProcShort (glMultiTexCoord3d)
902 && FindProcShort (glMultiTexCoord3dv)
903 && FindProcShort (glMultiTexCoord3f)
904 && FindProcShort (glMultiTexCoord3fv)
905 && FindProcShort (glMultiTexCoord3i)
906 && FindProcShort (glMultiTexCoord3iv)
907 && FindProcShort (glMultiTexCoord3s)
908 && FindProcShort (glMultiTexCoord3sv)
909 && FindProcShort (glMultiTexCoord4d)
910 && FindProcShort (glMultiTexCoord4dv)
911 && FindProcShort (glMultiTexCoord4f)
912 && FindProcShort (glMultiTexCoord4fv)
913 && FindProcShort (glMultiTexCoord4i)
914 && FindProcShort (glMultiTexCoord4iv)
915 && FindProcShort (glMultiTexCoord4s)
916 && FindProcShort (glMultiTexCoord4sv)
917 && FindProcShort (glLoadTransposeMatrixf)
918 && FindProcShort (glLoadTransposeMatrixd)
919 && FindProcShort (glMultTransposeMatrixf)
920 && FindProcShort (glMultTransposeMatrixd);
922 // load OpenGL 1.4 new functions
923 has14 = IsGlGreaterEqual (1, 4)
924 && FindProcShort (glBlendFuncSeparate)
925 && FindProcShort (glMultiDrawArrays)
926 && FindProcShort (glMultiDrawElements)
927 && FindProcShort (glPointParameterf)
928 && FindProcShort (glPointParameterfv)
929 && FindProcShort (glPointParameteri)
930 && FindProcShort (glPointParameteriv);
932 // load OpenGL 1.5 new functions
933 has15 = IsGlGreaterEqual (1, 5)
934 && FindProcShort (glGenQueries)
935 && FindProcShort (glDeleteQueries)
936 && FindProcShort (glIsQuery)
937 && FindProcShort (glBeginQuery)
938 && FindProcShort (glEndQuery)
939 && FindProcShort (glGetQueryiv)
940 && FindProcShort (glGetQueryObjectiv)
941 && FindProcShort (glGetQueryObjectuiv)
942 && FindProcShort (glBindBuffer)
943 && FindProcShort (glDeleteBuffers)
944 && FindProcShort (glGenBuffers)
945 && FindProcShort (glIsBuffer)
946 && FindProcShort (glBufferData)
947 && FindProcShort (glBufferSubData)
948 && FindProcShort (glGetBufferSubData)
949 && FindProcShort (glMapBuffer)
950 && FindProcShort (glUnmapBuffer)
951 && FindProcShort (glGetBufferParameteriv)
952 && FindProcShort (glGetBufferPointerv);
954 // load OpenGL 2.0 new functions
955 has20 = IsGlGreaterEqual (2, 0)
956 && FindProcShort (glBlendEquationSeparate)
957 && FindProcShort (glDrawBuffers)
958 && FindProcShort (glStencilOpSeparate)
959 && FindProcShort (glStencilFuncSeparate)
960 && FindProcShort (glStencilMaskSeparate)
961 && FindProcShort (glAttachShader)
962 && FindProcShort (glBindAttribLocation)
963 && FindProcShort (glCompileShader)
964 && FindProcShort (glCreateProgram)
965 && FindProcShort (glCreateShader)
966 && FindProcShort (glDeleteProgram)
967 && FindProcShort (glDeleteShader)
968 && FindProcShort (glDetachShader)
969 && FindProcShort (glDisableVertexAttribArray)
970 && FindProcShort (glEnableVertexAttribArray)
971 && FindProcShort (glGetActiveAttrib)
972 && FindProcShort (glGetActiveUniform)
973 && FindProcShort (glGetAttachedShaders)
974 && FindProcShort (glGetAttribLocation)
975 && FindProcShort (glGetProgramiv)
976 && FindProcShort (glGetProgramInfoLog)
977 && FindProcShort (glGetShaderiv)
978 && FindProcShort (glGetShaderInfoLog)
979 && FindProcShort (glGetShaderSource)
980 && FindProcShort (glGetUniformLocation)
981 && FindProcShort (glGetUniformfv)
982 && FindProcShort (glGetUniformiv)
983 && FindProcShort (glGetVertexAttribdv)
984 && FindProcShort (glGetVertexAttribfv)
985 && FindProcShort (glGetVertexAttribiv)
986 && FindProcShort (glGetVertexAttribPointerv)
987 && FindProcShort (glIsProgram)
988 && FindProcShort (glIsShader)
989 && FindProcShort (glLinkProgram)
990 && FindProcShort (glShaderSource)
991 && FindProcShort (glUseProgram)
992 && FindProcShort (glUniform1f)
993 && FindProcShort (glUniform2f)
994 && FindProcShort (glUniform3f)
995 && FindProcShort (glUniform4f)
996 && FindProcShort (glUniform1i)
997 && FindProcShort (glUniform2i)
998 && FindProcShort (glUniform3i)
999 && FindProcShort (glUniform4i)
1000 && FindProcShort (glUniform1fv)
1001 && FindProcShort (glUniform2fv)
1002 && FindProcShort (glUniform3fv)
1003 && FindProcShort (glUniform4fv)
1004 && FindProcShort (glUniform1iv)
1005 && FindProcShort (glUniform2iv)
1006 && FindProcShort (glUniform3iv)
1007 && FindProcShort (glUniform4iv)
1008 && FindProcShort (glUniformMatrix2fv)
1009 && FindProcShort (glUniformMatrix3fv)
1010 && FindProcShort (glUniformMatrix4fv)
1011 && FindProcShort (glValidateProgram)
1012 && FindProcShort (glVertexAttrib1d)
1013 && FindProcShort (glVertexAttrib1dv)
1014 && FindProcShort (glVertexAttrib1f)
1015 && FindProcShort (glVertexAttrib1fv)
1016 && FindProcShort (glVertexAttrib1s)
1017 && FindProcShort (glVertexAttrib1sv)
1018 && FindProcShort (glVertexAttrib2d)
1019 && FindProcShort (glVertexAttrib2dv)
1020 && FindProcShort (glVertexAttrib2f)
1021 && FindProcShort (glVertexAttrib2fv)
1022 && FindProcShort (glVertexAttrib2s)
1023 && FindProcShort (glVertexAttrib2sv)
1024 && FindProcShort (glVertexAttrib3d)
1025 && FindProcShort (glVertexAttrib3dv)
1026 && FindProcShort (glVertexAttrib3f)
1027 && FindProcShort (glVertexAttrib3fv)
1028 && FindProcShort (glVertexAttrib3s)
1029 && FindProcShort (glVertexAttrib3sv)
1030 && FindProcShort (glVertexAttrib4Nbv)
1031 && FindProcShort (glVertexAttrib4Niv)
1032 && FindProcShort (glVertexAttrib4Nsv)
1033 && FindProcShort (glVertexAttrib4Nub)
1034 && FindProcShort (glVertexAttrib4Nubv)
1035 && FindProcShort (glVertexAttrib4Nuiv)
1036 && FindProcShort (glVertexAttrib4Nusv)
1037 && FindProcShort (glVertexAttrib4bv)
1038 && FindProcShort (glVertexAttrib4d)
1039 && FindProcShort (glVertexAttrib4dv)
1040 && FindProcShort (glVertexAttrib4f)
1041 && FindProcShort (glVertexAttrib4fv)
1042 && FindProcShort (glVertexAttrib4iv)
1043 && FindProcShort (glVertexAttrib4s)
1044 && FindProcShort (glVertexAttrib4sv)
1045 && FindProcShort (glVertexAttrib4ubv)
1046 && FindProcShort (glVertexAttrib4uiv)
1047 && FindProcShort (glVertexAttrib4usv)
1048 && FindProcShort (glVertexAttribPointer);
1050 // load OpenGL 2.1 new functions
1051 has21 = IsGlGreaterEqual (2, 1)
1052 && FindProcShort (glUniformMatrix2x3fv)
1053 && FindProcShort (glUniformMatrix3x2fv)
1054 && FindProcShort (glUniformMatrix2x4fv)
1055 && FindProcShort (glUniformMatrix4x2fv)
1056 && FindProcShort (glUniformMatrix3x4fv)
1057 && FindProcShort (glUniformMatrix4x3fv);
1059 // load GL_ARB_framebuffer_object (added to OpenGL 3.0 core)
1060 const bool hasFBO = (IsGlGreaterEqual (3, 0) || CheckExtension ("GL_ARB_framebuffer_object"))
1061 && FindProcShort (glIsRenderbuffer)
1062 && FindProcShort (glBindRenderbuffer)
1063 && FindProcShort (glDeleteRenderbuffers)
1064 && FindProcShort (glGenRenderbuffers)
1065 && FindProcShort (glRenderbufferStorage)
1066 && FindProcShort (glGetRenderbufferParameteriv)
1067 && FindProcShort (glIsFramebuffer)
1068 && FindProcShort (glBindFramebuffer)
1069 && FindProcShort (glDeleteFramebuffers)
1070 && FindProcShort (glGenFramebuffers)
1071 && FindProcShort (glCheckFramebufferStatus)
1072 && FindProcShort (glFramebufferTexture1D)
1073 && FindProcShort (glFramebufferTexture2D)
1074 && FindProcShort (glFramebufferTexture3D)
1075 && FindProcShort (glFramebufferRenderbuffer)
1076 && FindProcShort (glGetFramebufferAttachmentParameteriv)
1077 && FindProcShort (glGenerateMipmap)
1078 && FindProcShort (glBlitFramebuffer)
1079 && FindProcShort (glRenderbufferStorageMultisample)
1080 && FindProcShort (glFramebufferTextureLayer);
1082 // load GL_ARB_vertex_array_object (added to OpenGL 3.0 core)
1083 const bool hasVAO = (IsGlGreaterEqual (3, 0) || CheckExtension ("GL_ARB_vertex_array_object"))
1084 && FindProcShort (glBindVertexArray)
1085 && FindProcShort (glDeleteVertexArrays)
1086 && FindProcShort (glGenVertexArrays)
1087 && FindProcShort (glIsVertexArray);
1089 // load GL_ARB_map_buffer_range (added to OpenGL 3.0 core)
1090 const bool hasMapBufferRange = (IsGlGreaterEqual (3, 0) || CheckExtension ("GL_ARB_map_buffer_range"))
1091 && FindProcShort (glMapBufferRange)
1092 && FindProcShort (glFlushMappedBufferRange);
1094 // load OpenGL 3.0 new functions
1095 has30 = IsGlGreaterEqual (3, 0)
1098 && hasMapBufferRange
1099 && FindProcShort (glColorMaski)
1100 && FindProcShort (glGetBooleani_v)
1101 && FindProcShort (glGetIntegeri_v)
1102 && FindProcShort (glEnablei)
1103 && FindProcShort (glDisablei)
1104 && FindProcShort (glIsEnabledi)
1105 && FindProcShort (glBeginTransformFeedback)
1106 && FindProcShort (glEndTransformFeedback)
1107 && FindProcShort (glBindBufferRange)
1108 && FindProcShort (glBindBufferBase)
1109 && FindProcShort (glTransformFeedbackVaryings)
1110 && FindProcShort (glGetTransformFeedbackVarying)
1111 && FindProcShort (glClampColor)
1112 && FindProcShort (glBeginConditionalRender)
1113 && FindProcShort (glEndConditionalRender)
1114 && FindProcShort (glVertexAttribIPointer)
1115 && FindProcShort (glGetVertexAttribIiv)
1116 && FindProcShort (glGetVertexAttribIuiv)
1117 && FindProcShort (glVertexAttribI1i)
1118 && FindProcShort (glVertexAttribI2i)
1119 && FindProcShort (glVertexAttribI3i)
1120 && FindProcShort (glVertexAttribI4i)
1121 && FindProcShort (glVertexAttribI1ui)
1122 && FindProcShort (glVertexAttribI2ui)
1123 && FindProcShort (glVertexAttribI3ui)
1124 && FindProcShort (glVertexAttribI4ui)
1125 && FindProcShort (glVertexAttribI1iv)
1126 && FindProcShort (glVertexAttribI2iv)
1127 && FindProcShort (glVertexAttribI3iv)
1128 && FindProcShort (glVertexAttribI4iv)
1129 && FindProcShort (glVertexAttribI1uiv)
1130 && FindProcShort (glVertexAttribI2uiv)
1131 && FindProcShort (glVertexAttribI3uiv)
1132 && FindProcShort (glVertexAttribI4uiv)
1133 && FindProcShort (glVertexAttribI4bv)
1134 && FindProcShort (glVertexAttribI4sv)
1135 && FindProcShort (glVertexAttribI4ubv)
1136 && FindProcShort (glVertexAttribI4usv)
1137 && FindProcShort (glGetUniformuiv)
1138 && FindProcShort (glBindFragDataLocation)
1139 && FindProcShort (glGetFragDataLocation)
1140 && FindProcShort (glUniform1ui)
1141 && FindProcShort (glUniform2ui)
1142 && FindProcShort (glUniform3ui)
1143 && FindProcShort (glUniform4ui)
1144 && FindProcShort (glUniform1uiv)
1145 && FindProcShort (glUniform2uiv)
1146 && FindProcShort (glUniform3uiv)
1147 && FindProcShort (glUniform4uiv)
1148 && FindProcShort (glTexParameterIiv)
1149 && FindProcShort (glTexParameterIuiv)
1150 && FindProcShort (glGetTexParameterIiv)
1151 && FindProcShort (glGetTexParameterIuiv)
1152 && FindProcShort (glClearBufferiv)
1153 && FindProcShort (glClearBufferuiv)
1154 && FindProcShort (glClearBufferfv)
1155 && FindProcShort (glClearBufferfi)
1156 && FindProcShort (glGetStringi);
1158 // load GL_ARB_uniform_buffer_object (added to OpenGL 3.1 core)
1159 const bool hasUBO = (IsGlGreaterEqual (3, 1) || CheckExtension ("GL_ARB_uniform_buffer_object"))
1160 && FindProcShort (glGetUniformIndices)
1161 && FindProcShort (glGetActiveUniformsiv)
1162 && FindProcShort (glGetActiveUniformName)
1163 && FindProcShort (glGetUniformBlockIndex)
1164 && FindProcShort (glGetActiveUniformBlockiv)
1165 && FindProcShort (glGetActiveUniformBlockName)
1166 && FindProcShort (glUniformBlockBinding);
1168 // load GL_ARB_copy_buffer (added to OpenGL 3.1 core)
1169 const bool hasCopyBufSubData = (IsGlGreaterEqual (3, 1) || CheckExtension ("GL_ARB_copy_buffer"))
1170 && FindProcShort (glCopyBufferSubData);
1174 // NPOT textures are required by OpenGL 2.0 specifications
1175 // but doesn't hardware accelerated by some ancient OpenGL 2.1 hardware (GeForce FX, RadeOn 9700 etc.)
1176 arbNPTW = Standard_True;
1177 arbTexRG = Standard_True;
1180 // load OpenGL 3.1 new functions
1181 has31 = IsGlGreaterEqual (3, 1)
1183 && hasCopyBufSubData
1184 && FindProcShort (glDrawArraysInstanced)
1185 && FindProcShort (glDrawElementsInstanced)
1186 && FindProcShort (glTexBuffer)
1187 && FindProcShort (glPrimitiveRestartIndex);
1189 // load GL_ARB_draw_elements_base_vertex (added to OpenGL 3.2 core)
1190 const bool hasDrawElemsBaseVert = (IsGlGreaterEqual (3, 2) || CheckExtension ("GL_ARB_draw_elements_base_vertex"))
1191 && FindProcShort (glDrawElementsBaseVertex)
1192 && FindProcShort (glDrawRangeElementsBaseVertex)
1193 && FindProcShort (glDrawElementsInstancedBaseVertex)
1194 && FindProcShort (glMultiDrawElementsBaseVertex);
1196 // load GL_ARB_provoking_vertex (added to OpenGL 3.2 core)
1197 const bool hasProvokingVert = (IsGlGreaterEqual (3, 2) || CheckExtension ("GL_ARB_provoking_vertex"))
1198 && FindProcShort (glProvokingVertex);
1200 // load GL_ARB_sync (added to OpenGL 3.2 core)
1201 const bool hasSync = (IsGlGreaterEqual (3, 2) || CheckExtension ("GL_ARB_sync"))
1202 && FindProcShort (glFenceSync)
1203 && FindProcShort (glIsSync)
1204 && FindProcShort (glDeleteSync)
1205 && FindProcShort (glClientWaitSync)
1206 && FindProcShort (glWaitSync)
1207 && FindProcShort (glGetInteger64v)
1208 && FindProcShort (glGetSynciv);
1210 // load GL_ARB_texture_multisample (added to OpenGL 3.2 core)
1211 const bool hasTextureMultisample = (IsGlGreaterEqual (3, 2) || CheckExtension ("GL_ARB_texture_multisample"))
1212 && FindProcShort (glTexImage2DMultisample)
1213 && FindProcShort (glTexImage3DMultisample)
1214 && FindProcShort (glGetMultisamplefv)
1215 && FindProcShort (glSampleMaski);
1217 // load OpenGL 3.2 new functions
1218 has32 = IsGlGreaterEqual (3, 2)
1219 && hasDrawElemsBaseVert
1222 && hasTextureMultisample
1223 && FindProcShort (glGetInteger64i_v)
1224 && FindProcShort (glGetBufferParameteri64v)
1225 && FindProcShort (glFramebufferTexture);
1227 // load GL_ARB_blend_func_extended (added to OpenGL 3.3 core)
1228 const bool hasBlendFuncExtended = (IsGlGreaterEqual (3, 3) || CheckExtension ("GL_ARB_blend_func_extended"))
1229 && FindProcShort (glBindFragDataLocationIndexed)
1230 && FindProcShort (glGetFragDataIndex);
1232 // load GL_ARB_sampler_objects (added to OpenGL 3.3 core)
1233 const bool hasSamplerObjects = (IsGlGreaterEqual (3, 3) || CheckExtension ("GL_ARB_sampler_objects"))
1234 && FindProcShort (glGenSamplers)
1235 && FindProcShort (glDeleteSamplers)
1236 && FindProcShort (glIsSampler)
1237 && FindProcShort (glBindSampler)
1238 && FindProcShort (glSamplerParameteri)
1239 && FindProcShort (glSamplerParameteriv)
1240 && FindProcShort (glSamplerParameterf)
1241 && FindProcShort (glSamplerParameterfv)
1242 && FindProcShort (glSamplerParameterIiv)
1243 && FindProcShort (glSamplerParameterIuiv)
1244 && FindProcShort (glGetSamplerParameteriv)
1245 && FindProcShort (glGetSamplerParameterIiv)
1246 && FindProcShort (glGetSamplerParameterfv)
1247 && FindProcShort (glGetSamplerParameterIuiv);
1249 // load GL_ARB_timer_query (added to OpenGL 3.3 core)
1250 const bool hasTimerQuery = (IsGlGreaterEqual (3, 3) || CheckExtension ("GL_ARB_timer_query"))
1251 && FindProcShort (glQueryCounter)
1252 && FindProcShort (glGetQueryObjecti64v)
1253 && FindProcShort (glGetQueryObjectui64v);
1255 // load GL_ARB_vertex_type_2_10_10_10_rev (added to OpenGL 3.3 core)
1256 const bool hasVertType21010101rev = (IsGlGreaterEqual (3, 3) || CheckExtension ("GL_ARB_vertex_type_2_10_10_10_rev"))
1257 && FindProcShort (glVertexP2ui)
1258 && FindProcShort (glVertexP2uiv)
1259 && FindProcShort (glVertexP3ui)
1260 && FindProcShort (glVertexP3uiv)
1261 && FindProcShort (glVertexP4ui)
1262 && FindProcShort (glVertexP4uiv)
1263 && FindProcShort (glTexCoordP1ui)
1264 && FindProcShort (glTexCoordP1uiv)
1265 && FindProcShort (glTexCoordP2ui)
1266 && FindProcShort (glTexCoordP2uiv)
1267 && FindProcShort (glTexCoordP3ui)
1268 && FindProcShort (glTexCoordP3uiv)
1269 && FindProcShort (glTexCoordP4ui)
1270 && FindProcShort (glTexCoordP4uiv)
1271 && FindProcShort (glMultiTexCoordP1ui)
1272 && FindProcShort (glMultiTexCoordP1uiv)
1273 && FindProcShort (glMultiTexCoordP2ui)
1274 && FindProcShort (glMultiTexCoordP2uiv)
1275 && FindProcShort (glMultiTexCoordP3ui)
1276 && FindProcShort (glMultiTexCoordP3uiv)
1277 && FindProcShort (glMultiTexCoordP4ui)
1278 && FindProcShort (glMultiTexCoordP4uiv)
1279 && FindProcShort (glNormalP3ui)
1280 && FindProcShort (glNormalP3uiv)
1281 && FindProcShort (glColorP3ui)
1282 && FindProcShort (glColorP3uiv)
1283 && FindProcShort (glColorP4ui)
1284 && FindProcShort (glColorP4uiv)
1285 && FindProcShort (glSecondaryColorP3ui)
1286 && FindProcShort (glSecondaryColorP3uiv)
1287 && FindProcShort (glVertexAttribP1ui)
1288 && FindProcShort (glVertexAttribP1uiv)
1289 && FindProcShort (glVertexAttribP2ui)
1290 && FindProcShort (glVertexAttribP2uiv)
1291 && FindProcShort (glVertexAttribP3ui)
1292 && FindProcShort (glVertexAttribP3uiv)
1293 && FindProcShort (glVertexAttribP4ui)
1294 && FindProcShort (glVertexAttribP4uiv);
1296 // load OpenGL 3.3 extra functions
1297 has33 = IsGlGreaterEqual (3, 3)
1298 && hasBlendFuncExtended
1299 && hasSamplerObjects
1301 && hasVertType21010101rev
1302 && FindProcShort (glVertexAttribDivisor);
1304 // load GL_ARB_draw_indirect (added to OpenGL 4.0 core)
1305 const bool hasDrawIndirect = (IsGlGreaterEqual (4, 0) || CheckExtension ("GL_ARB_draw_indirect"))
1306 && FindProcShort (glDrawArraysIndirect)
1307 && FindProcShort (glDrawElementsIndirect);
1309 // load GL_ARB_gpu_shader_fp64 (added to OpenGL 4.0 core)
1310 const bool hasShaderFP64 = (IsGlGreaterEqual (4, 0) || CheckExtension ("GL_ARB_gpu_shader_fp64"))
1311 && FindProcShort (glUniform1d)
1312 && FindProcShort (glUniform2d)
1313 && FindProcShort (glUniform3d)
1314 && FindProcShort (glUniform4d)
1315 && FindProcShort (glUniform1dv)
1316 && FindProcShort (glUniform2dv)
1317 && FindProcShort (glUniform3dv)
1318 && FindProcShort (glUniform4dv)
1319 && FindProcShort (glUniformMatrix2dv)
1320 && FindProcShort (glUniformMatrix3dv)
1321 && FindProcShort (glUniformMatrix4dv)
1322 && FindProcShort (glUniformMatrix2x3dv)
1323 && FindProcShort (glUniformMatrix2x4dv)
1324 && FindProcShort (glUniformMatrix3x2dv)
1325 && FindProcShort (glUniformMatrix3x4dv)
1326 && FindProcShort (glUniformMatrix4x2dv)
1327 && FindProcShort (glUniformMatrix4x3dv)
1328 && FindProcShort (glGetUniformdv);
1330 // load GL_ARB_shader_subroutine (added to OpenGL 4.0 core)
1331 const bool hasShaderSubroutine = (IsGlGreaterEqual (4, 0) || CheckExtension ("GL_ARB_shader_subroutine"))
1332 && FindProcShort (glGetSubroutineUniformLocation)
1333 && FindProcShort (glGetSubroutineIndex)
1334 && FindProcShort (glGetActiveSubroutineUniformiv)
1335 && FindProcShort (glGetActiveSubroutineUniformName)
1336 && FindProcShort (glGetActiveSubroutineName)
1337 && FindProcShort (glUniformSubroutinesuiv)
1338 && FindProcShort (glGetUniformSubroutineuiv)
1339 && FindProcShort (glGetProgramStageiv);
1341 // load GL_ARB_tessellation_shader (added to OpenGL 4.0 core)
1342 const bool hasTessellationShader = (IsGlGreaterEqual (4, 0) || CheckExtension ("GL_ARB_tessellation_shader"))
1343 && FindProcShort (glPatchParameteri)
1344 && FindProcShort (glPatchParameterfv);
1346 // load GL_ARB_transform_feedback2 (added to OpenGL 4.0 core)
1347 const bool hasTrsfFeedback2 = (IsGlGreaterEqual (4, 0) || CheckExtension ("GL_ARB_transform_feedback2"))
1348 && FindProcShort (glBindTransformFeedback)
1349 && FindProcShort (glDeleteTransformFeedbacks)
1350 && FindProcShort (glGenTransformFeedbacks)
1351 && FindProcShort (glIsTransformFeedback)
1352 && FindProcShort (glPauseTransformFeedback)
1353 && FindProcShort (glResumeTransformFeedback)
1354 && FindProcShort (glDrawTransformFeedback);
1356 // load GL_ARB_transform_feedback3 (added to OpenGL 4.0 core)
1357 const bool hasTrsfFeedback3 = (IsGlGreaterEqual (4, 0) || CheckExtension ("GL_ARB_transform_feedback3"))
1358 && FindProcShort (glDrawTransformFeedbackStream)
1359 && FindProcShort (glBeginQueryIndexed)
1360 && FindProcShort (glEndQueryIndexed)
1361 && FindProcShort (glGetQueryIndexediv);
1363 // load OpenGL 4.0 new functions
1364 has40 = IsGlGreaterEqual (4, 0)
1367 && hasShaderSubroutine
1368 && hasTessellationShader
1371 && FindProcShort (glMinSampleShading)
1372 && FindProcShort (glBlendEquationi)
1373 && FindProcShort (glBlendEquationSeparatei)
1374 && FindProcShort (glBlendFunci)
1375 && FindProcShort (glBlendFuncSeparatei);
1377 // load GL_ARB_ES2_compatibility (added to OpenGL 4.1 core)
1378 const bool hasES2Compatibility = (IsGlGreaterEqual (4, 1) || CheckExtension ("GL_ARB_ES2_compatibility"))
1379 && FindProcShort (glReleaseShaderCompiler)
1380 && FindProcShort (glShaderBinary)
1381 && FindProcShort (glGetShaderPrecisionFormat)
1382 && FindProcShort (glDepthRangef)
1383 && FindProcShort (glClearDepthf);
1385 // load GL_ARB_get_program_binary (added to OpenGL 4.1 core)
1386 const bool hasGetProgramBinary = (IsGlGreaterEqual (4, 1) || CheckExtension ("GL_ARB_get_program_binary"))
1387 && FindProcShort (glGetProgramBinary)
1388 && FindProcShort (glProgramBinary)
1389 && FindProcShort (glProgramParameteri);
1392 // load GL_ARB_separate_shader_objects (added to OpenGL 4.1 core)
1393 const bool hasSeparateShaderObjects = (IsGlGreaterEqual (4, 1) || CheckExtension ("GL_ARB_separate_shader_objects"))
1394 && FindProcShort (glUseProgramStages)
1395 && FindProcShort (glActiveShaderProgram)
1396 && FindProcShort (glCreateShaderProgramv)
1397 && FindProcShort (glBindProgramPipeline)
1398 && FindProcShort (glDeleteProgramPipelines)
1399 && FindProcShort (glGenProgramPipelines)
1400 && FindProcShort (glIsProgramPipeline)
1401 && FindProcShort (glGetProgramPipelineiv)
1402 && FindProcShort (glProgramUniform1i)
1403 && FindProcShort (glProgramUniform1iv)
1404 && FindProcShort (glProgramUniform1f)
1405 && FindProcShort (glProgramUniform1fv)
1406 && FindProcShort (glProgramUniform1d)
1407 && FindProcShort (glProgramUniform1dv)
1408 && FindProcShort (glProgramUniform1ui)
1409 && FindProcShort (glProgramUniform1uiv)
1410 && FindProcShort (glProgramUniform2i)
1411 && FindProcShort (glProgramUniform2iv)
1412 && FindProcShort (glProgramUniform2f)
1413 && FindProcShort (glProgramUniform2fv)
1414 && FindProcShort (glProgramUniform2d)
1415 && FindProcShort (glProgramUniform2dv)
1416 && FindProcShort (glProgramUniform2ui)
1417 && FindProcShort (glProgramUniform2uiv)
1418 && FindProcShort (glProgramUniform3i)
1419 && FindProcShort (glProgramUniform3iv)
1420 && FindProcShort (glProgramUniform3f)
1421 && FindProcShort (glProgramUniform3fv)
1422 && FindProcShort (glProgramUniform3d)
1423 && FindProcShort (glProgramUniform3dv)
1424 && FindProcShort (glProgramUniform3ui)
1425 && FindProcShort (glProgramUniform3uiv)
1426 && FindProcShort (glProgramUniform4i)
1427 && FindProcShort (glProgramUniform4iv)
1428 && FindProcShort (glProgramUniform4f)
1429 && FindProcShort (glProgramUniform4fv)
1430 && FindProcShort (glProgramUniform4d)
1431 && FindProcShort (glProgramUniform4dv)
1432 && FindProcShort (glProgramUniform4ui)
1433 && FindProcShort (glProgramUniform4uiv)
1434 && FindProcShort (glProgramUniformMatrix2fv)
1435 && FindProcShort (glProgramUniformMatrix3fv)
1436 && FindProcShort (glProgramUniformMatrix4fv)
1437 && FindProcShort (glProgramUniformMatrix2dv)
1438 && FindProcShort (glProgramUniformMatrix3dv)
1439 && FindProcShort (glProgramUniformMatrix4dv)
1440 && FindProcShort (glProgramUniformMatrix2x3fv)
1441 && FindProcShort (glProgramUniformMatrix3x2fv)
1442 && FindProcShort (glProgramUniformMatrix2x4fv)
1443 && FindProcShort (glProgramUniformMatrix4x2fv)
1444 && FindProcShort (glProgramUniformMatrix3x4fv)
1445 && FindProcShort (glProgramUniformMatrix4x3fv)
1446 && FindProcShort (glProgramUniformMatrix2x3dv)
1447 && FindProcShort (glProgramUniformMatrix3x2dv)
1448 && FindProcShort (glProgramUniformMatrix2x4dv)
1449 && FindProcShort (glProgramUniformMatrix4x2dv)
1450 && FindProcShort (glProgramUniformMatrix3x4dv)
1451 && FindProcShort (glProgramUniformMatrix4x3dv)
1452 && FindProcShort (glValidateProgramPipeline)
1453 && FindProcShort (glGetProgramPipelineInfoLog);
1455 // load GL_ARB_vertex_attrib_64bit (added to OpenGL 4.1 core)
1456 const bool hasVertAttrib64bit = (IsGlGreaterEqual (4, 1) || CheckExtension ("GL_ARB_vertex_attrib_64bit"))
1457 && FindProcShort (glVertexAttribL1d)
1458 && FindProcShort (glVertexAttribL2d)
1459 && FindProcShort (glVertexAttribL3d)
1460 && FindProcShort (glVertexAttribL4d)
1461 && FindProcShort (glVertexAttribL1dv)
1462 && FindProcShort (glVertexAttribL2dv)
1463 && FindProcShort (glVertexAttribL3dv)
1464 && FindProcShort (glVertexAttribL4dv)
1465 && FindProcShort (glVertexAttribLPointer)
1466 && FindProcShort (glGetVertexAttribLdv);
1468 // load GL_ARB_viewport_array (added to OpenGL 4.1 core)
1469 const bool hasViewportArray = (IsGlGreaterEqual (4, 1) || CheckExtension ("GL_ARB_viewport_array"))
1470 && FindProcShort (glViewportArrayv)
1471 && FindProcShort (glViewportIndexedf)
1472 && FindProcShort (glViewportIndexedfv)
1473 && FindProcShort (glScissorArrayv)
1474 && FindProcShort (glScissorIndexed)
1475 && FindProcShort (glScissorIndexedv)
1476 && FindProcShort (glDepthRangeArrayv)
1477 && FindProcShort (glDepthRangeIndexed)
1478 && FindProcShort (glGetFloati_v)
1479 && FindProcShort (glGetDoublei_v);
1481 has41 = IsGlGreaterEqual (4, 1)
1482 && hasES2Compatibility
1483 && hasGetProgramBinary
1484 && hasSeparateShaderObjects
1485 && hasVertAttrib64bit
1486 && hasViewportArray;
1488 // load GL_ARB_base_instance (added to OpenGL 4.2 core)
1489 const bool hasBaseInstance = (IsGlGreaterEqual (4, 2) || CheckExtension ("GL_ARB_base_instance"))
1490 && FindProcShort (glDrawArraysInstancedBaseInstance)
1491 && FindProcShort (glDrawElementsInstancedBaseInstance)
1492 && FindProcShort (glDrawElementsInstancedBaseVertexBaseInstance);
1494 // load GL_ARB_transform_feedback_instanced (added to OpenGL 4.2 core)
1495 const bool hasTrsfFeedbackInstanced = (IsGlGreaterEqual (4, 2) || CheckExtension ("GL_ARB_transform_feedback_instanced"))
1496 && FindProcShort (glDrawTransformFeedbackInstanced)
1497 && FindProcShort (glDrawTransformFeedbackStreamInstanced);
1499 // load GL_ARB_internalformat_query (added to OpenGL 4.2 core)
1500 const bool hasInternalFormatQuery = (IsGlGreaterEqual (4, 2) || CheckExtension ("GL_ARB_internalformat_query"))
1501 && FindProcShort (glGetInternalformativ);
1503 // load GL_ARB_shader_atomic_counters (added to OpenGL 4.2 core)
1504 const bool hasShaderAtomicCounters = (IsGlGreaterEqual (4, 2) || CheckExtension ("GL_ARB_shader_atomic_counters"))
1505 && FindProcShort (glGetActiveAtomicCounterBufferiv);
1507 // load GL_ARB_shader_image_load_store (added to OpenGL 4.2 core)
1508 const bool hasShaderImgLoadStore = (IsGlGreaterEqual (4, 2) || CheckExtension ("GL_ARB_shader_image_load_store"))
1509 && FindProcShort (glBindImageTexture)
1510 && FindProcShort (glMemoryBarrier);
1512 // load GL_ARB_texture_storage (added to OpenGL 4.2 core)
1513 const bool hasTextureStorage = (IsGlGreaterEqual (4, 2) || CheckExtension ("GL_ARB_texture_storage"))
1514 && FindProcShort (glTexStorage1D)
1515 && FindProcShort (glTexStorage2D)
1516 && FindProcShort (glTexStorage3D)
1517 && FindProcShort (glTextureStorage1DEXT)
1518 && FindProcShort (glTextureStorage2DEXT)
1519 && FindProcShort (glTextureStorage3DEXT);
1521 has42 = IsGlGreaterEqual (4, 2)
1523 && hasTrsfFeedbackInstanced
1524 && hasInternalFormatQuery
1525 && hasShaderAtomicCounters
1526 && hasShaderImgLoadStore
1527 && hasTextureStorage;
1529 has43 = IsGlGreaterEqual (4, 3)
1530 && FindProcShort (glClearBufferData)
1531 && FindProcShort (glClearBufferSubData)
1532 && FindProcShort (glDispatchCompute)
1533 && FindProcShort (glDispatchComputeIndirect)
1534 && FindProcShort (glCopyImageSubData)
1535 && FindProcShort (glFramebufferParameteri)
1536 && FindProcShort (glGetFramebufferParameteriv)
1537 && FindProcShort (glGetInternalformati64v)
1538 && FindProcShort (glInvalidateTexSubImage)
1539 && FindProcShort (glInvalidateTexImage)
1540 && FindProcShort (glInvalidateBufferSubData)
1541 && FindProcShort (glInvalidateBufferData)
1542 && FindProcShort (glInvalidateFramebuffer)
1543 && FindProcShort (glInvalidateSubFramebuffer)
1544 && FindProcShort (glMultiDrawArraysIndirect)
1545 && FindProcShort (glMultiDrawElementsIndirect)
1546 && FindProcShort (glGetProgramInterfaceiv)
1547 && FindProcShort (glGetProgramResourceIndex)
1548 && FindProcShort (glGetProgramResourceName)
1549 && FindProcShort (glGetProgramResourceiv)
1550 && FindProcShort (glGetProgramResourceLocation)
1551 && FindProcShort (glGetProgramResourceLocationIndex)
1552 && FindProcShort (glShaderStorageBlockBinding)
1553 && FindProcShort (glTexBufferRange)
1554 && FindProcShort (glTexStorage2DMultisample)
1555 && FindProcShort (glTexStorage3DMultisample)
1556 && FindProcShort (glTextureView)
1557 && FindProcShort (glBindVertexBuffer)
1558 && FindProcShort (glVertexAttribFormat)
1559 && FindProcShort (glVertexAttribIFormat)
1560 && FindProcShort (glVertexAttribLFormat)
1561 && FindProcShort (glVertexAttribBinding)
1562 && FindProcShort (glVertexBindingDivisor)
1563 && FindProcShort (glDebugMessageControl)
1564 && FindProcShort (glDebugMessageInsert)
1565 && FindProcShort (glDebugMessageCallback)
1566 && FindProcShort (glGetDebugMessageLog)
1567 && FindProcShort (glPushDebugGroup)
1568 && FindProcShort (glPopDebugGroup)
1569 && FindProcShort (glObjectLabel)
1570 && FindProcShort (glGetObjectLabel)
1571 && FindProcShort (glObjectPtrLabel)
1572 && FindProcShort (glGetObjectPtrLabel);
1574 // load GL_ARB_clear_texture (added to OpenGL 4.4 core)
1575 bool arbTexClear = (IsGlGreaterEqual (4, 4) || CheckExtension ("GL_ARB_clear_texture"))
1576 && FindProcShort (glClearTexImage)
1577 && FindProcShort (glClearTexSubImage);
1579 has44 = IsGlGreaterEqual (4, 4)
1581 && FindProcShort (glBufferStorage)
1582 && FindProcShort (glBindBuffersBase)
1583 && FindProcShort (glBindBuffersRange)
1584 && FindProcShort (glBindTextures)
1585 && FindProcShort (glBindSamplers)
1586 && FindProcShort (glBindImageTextures)
1587 && FindProcShort (glBindVertexBuffers);
1589 // initialize TBO extension (ARB)
1591 && CheckExtension ("GL_ARB_texture_buffer_object")
1592 && FindProc ("glTexBufferARB", myFuncs->glTexBuffer))
1594 arbTBO = (OpenGl_ArbTBO* )(&(*myFuncs));
1597 // initialize hardware instancing extension (ARB)
1599 && CheckExtension ("GL_ARB_draw_instanced")
1600 && FindProc ("glDrawArraysInstancedARB", myFuncs->glDrawArraysInstanced)
1601 && FindProc ("glDrawElementsInstancedARB", myFuncs->glDrawElementsInstanced))
1603 arbIns = (OpenGl_ArbIns* )(&(*myFuncs));
1606 // initialize FBO extension (ARB)
1609 arbFBO = (OpenGl_ArbFBO* )(&(*myFuncs));
1610 extPDS = Standard_True; // extension for EXT, but part of ARB
1613 // initialize GS extension (EXT)
1614 if (CheckExtension ("GL_EXT_geometry_shader4")
1615 && FindProcShort (glProgramParameteriEXT))
1617 extGS = (OpenGl_ExtGS* )(&(*myFuncs));
1644 core15 = (OpenGl_GlCore15* )(&(*myFuncs));
1645 core15fwd = (OpenGl_GlCore15Fwd* )(&(*myFuncs));
1654 core20 = (OpenGl_GlCore20* )(&(*myFuncs));
1655 core20fwd = (OpenGl_GlCore20Fwd* )(&(*myFuncs));
1677 arbTBO = (OpenGl_ArbTBO* )(&(*myFuncs));
1678 arbIns = (OpenGl_ArbIns* )(&(*myFuncs));
1686 core32 = (OpenGl_GlCore32* )(&(*myFuncs));
1687 core32back = (OpenGl_GlCore32Back* )(&(*myFuncs));
1709 core41 = (OpenGl_GlCore41* )(&(*myFuncs));
1710 core41back = (OpenGl_GlCore41Back* )(&(*myFuncs));
1718 core42 = (OpenGl_GlCore42* )(&(*myFuncs));
1719 core42back = (OpenGl_GlCore42Back* )(&(*myFuncs));
1727 core43 = (OpenGl_GlCore43* )(&(*myFuncs));
1728 core43back = (OpenGl_GlCore43Back* )(&(*myFuncs));
1736 core44 = (OpenGl_GlCore44* )(&(*myFuncs));
1737 core44back = (OpenGl_GlCore44Back* )(&(*myFuncs));
1740 // =======================================================================
1741 // function : MemoryInfo
1743 // =======================================================================
1744 Standard_Size OpenGl_Context::AvailableMemory() const
1748 // this is actually information for VBO pool
1749 // however because pools are mostly shared
1750 // it can be used for total GPU memory estimations
1753 glGetIntegerv (GL_VBO_FREE_MEMORY_ATI, aMemInfo);
1754 // returned value is in KiB, however this maybe changed in future
1755 return Standard_Size(aMemInfo[0]) * 1024;
1759 // current available dedicated video memory (in KiB), currently unused GPU memory
1761 glGetIntegerv (GL_GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX, &aMemInfo);
1762 return Standard_Size(aMemInfo) * 1024;
1767 // =======================================================================
1768 // function : MemoryInfo
1770 // =======================================================================
1771 TCollection_AsciiString OpenGl_Context::MemoryInfo() const
1773 TCollection_AsciiString anInfo;
1777 memset (aValues, 0, sizeof(aValues));
1778 glGetIntegerv (GL_VBO_FREE_MEMORY_ATI, aValues);
1780 // total memory free in the pool
1781 anInfo += TCollection_AsciiString (" GPU free memory: ") + (aValues[0] / 1024) + " MiB\n";
1783 // largest available free block in the pool
1784 anInfo += TCollection_AsciiString (" Largest free block: ") + (aValues[1] / 1024) + " MiB\n";
1785 if (aValues[2] != aValues[0])
1787 // total auxiliary memory free
1788 anInfo += TCollection_AsciiString (" Free memory: ") + (aValues[2] / 1024) + " MiB\n";
1793 //current available dedicated video memory (in KiB), currently unused GPU memory
1795 glGetIntegerv (GL_GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX, &aValue);
1796 anInfo += TCollection_AsciiString (" GPU free memory: ") + (aValue / 1024) + " MiB\n";
1798 // dedicated video memory, total size (in KiB) of the GPU memory
1799 GLint aDedicated = 0;
1800 glGetIntegerv (GL_GPU_MEMORY_INFO_DEDICATED_VIDMEM_NVX, &aDedicated);
1801 anInfo += TCollection_AsciiString (" GPU memory: ") + (aDedicated / 1024) + " MiB\n";
1803 // total available memory, total size (in KiB) of the memory available for allocations
1804 glGetIntegerv (GL_GPU_MEMORY_INFO_TOTAL_AVAILABLE_MEMORY_NVX, &aValue);
1805 if (aValue != aDedicated)
1807 // different only for special configurations
1808 anInfo += TCollection_AsciiString (" Total memory: ") + (aValue / 1024) + " MiB\n";
1815 // =======================================================================
1816 // function : GetResource
1818 // =======================================================================
1819 const Handle(OpenGl_Resource)& OpenGl_Context::GetResource (const TCollection_AsciiString& theKey) const
1821 return mySharedResources->IsBound (theKey) ? mySharedResources->Find (theKey) : NULL_GL_RESOURCE;
1824 // =======================================================================
1825 // function : ShareResource
1827 // =======================================================================
1828 Standard_Boolean OpenGl_Context::ShareResource (const TCollection_AsciiString& theKey,
1829 const Handle(OpenGl_Resource)& theResource)
1831 if (theKey.IsEmpty() || theResource.IsNull())
1833 return Standard_False;
1835 return mySharedResources->Bind (theKey, theResource);
1838 // =======================================================================
1839 // function : ReleaseResource
1841 // =======================================================================
1842 void OpenGl_Context::ReleaseResource (const TCollection_AsciiString& theKey,
1843 const Standard_Boolean theToDelay)
1845 if (!mySharedResources->IsBound (theKey))
1849 const Handle(OpenGl_Resource)& aRes = mySharedResources->Find (theKey);
1850 if (aRes->GetRefCount() > 1)
1857 myDelayed->Bind (theKey, 1);
1861 aRes->Release (this);
1862 mySharedResources->UnBind (theKey);
1866 // =======================================================================
1867 // function : DelayedRelease
1869 // =======================================================================
1870 void OpenGl_Context::DelayedRelease (Handle(OpenGl_Resource)& theResource)
1872 myReleaseQueue->Push (theResource);
1873 theResource.Nullify();
1876 // =======================================================================
1877 // function : ReleaseDelayed
1879 // =======================================================================
1880 void OpenGl_Context::ReleaseDelayed()
1882 // release queued elements
1883 while (!myReleaseQueue->IsEmpty())
1885 myReleaseQueue->Front()->Release (this);
1886 myReleaseQueue->Pop();
1889 // release delayed shared resources
1890 NCollection_Vector<TCollection_AsciiString> aDeadList;
1891 for (NCollection_DataMap<TCollection_AsciiString, Standard_Integer>::Iterator anIter (*myDelayed);
1892 anIter.More(); anIter.Next())
1894 if (++anIter.ChangeValue() <= 2)
1896 continue; // postpone release one more frame to ensure noone use it periodically
1899 const TCollection_AsciiString& aKey = anIter.Key();
1900 if (!mySharedResources->IsBound (aKey))
1902 // mixed unshared strategy delayed/undelayed was used!
1903 aDeadList.Append (aKey);
1907 Handle(OpenGl_Resource)& aRes = mySharedResources->ChangeFind (aKey);
1908 if (aRes->GetRefCount() > 1)
1910 // should be only 1 instance in mySharedResources
1911 // if not - resource was reused again
1912 aDeadList.Append (aKey);
1916 // release resource if no one requiested it more than 2 redraw calls
1917 aRes->Release (this);
1918 mySharedResources->UnBind (aKey);
1919 aDeadList.Append (aKey);
1922 for (Standard_Integer anIter = 0; anIter < aDeadList.Length(); ++anIter)
1924 myDelayed->UnBind (aDeadList.Value (anIter));