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_HatchStyle.hxx>
21 #include <Aspect_Drawable.hxx>
22 #include <Aspect_Display.hxx>
23 #include <Aspect_RenderingContext.hxx>
24 #include <Aspect_TypeOfLine.hxx>
25 #include <NCollection_DataMap.hxx>
26 #include <Graphic3d_DiagnosticInfo.hxx>
27 #include <NCollection_Map.hxx>
28 #include <NCollection_Handle.hxx>
29 #include <NCollection_List.hxx>
30 #include <Message.hxx>
31 #include <OpenGl_Caps.hxx>
32 #include <OpenGl_LineAttributes.hxx>
33 #include <OpenGl_Material.hxx>
34 #include <OpenGl_MatrixState.hxx>
35 #include <OpenGl_Vec.hxx>
36 #include <OpenGl_Resource.hxx>
37 #include <Standard_Transient.hxx>
38 #include <TColStd_IndexedDataMapOfStringString.hxx>
39 #include <TColStd_PackedMapOfInteger.hxx>
40 #include <OpenGl_Clipping.hxx>
41 #include <OpenGl_GlCore11.hxx>
42 #include <OpenGl_ShaderProgram.hxx>
44 #include <NCollection_Shared.hxx>
46 //! Forward declarations
47 #if defined(__APPLE__)
48 #import <TargetConditionals.h>
49 #if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
57 @class NSOpenGLContext;
59 struct NSOpenGLContext;
64 struct OpenGl_GlFunctions;
69 struct OpenGl_ArbFBOBlit;
71 struct OpenGl_ArbTexBindless;
73 template<typename theBaseClass_t> struct OpenGl_TmplCore12;
74 typedef OpenGl_TmplCore12<OpenGl_GlCore11> OpenGl_GlCore12;
75 typedef OpenGl_TmplCore12<OpenGl_GlCore11Fwd> OpenGl_GlCore12Fwd;
77 struct OpenGl_GlCore13;
78 struct OpenGl_GlCore13Fwd;
80 template<typename theBaseClass_t> struct OpenGl_TmplCore14;
81 typedef OpenGl_TmplCore14<OpenGl_GlCore13> OpenGl_GlCore14;
82 typedef OpenGl_TmplCore14<OpenGl_GlCore13Fwd> OpenGl_GlCore14Fwd;
84 template<typename theBaseClass_t> struct OpenGl_TmplCore15;
85 typedef OpenGl_TmplCore15<OpenGl_GlCore14> OpenGl_GlCore15;
86 typedef OpenGl_TmplCore15<OpenGl_GlCore14Fwd> OpenGl_GlCore15Fwd;
88 template<typename theBaseClass_t> struct OpenGl_TmplCore20;
89 typedef OpenGl_TmplCore20<OpenGl_GlCore15> OpenGl_GlCore20;
90 typedef OpenGl_TmplCore20<OpenGl_GlCore15Fwd> OpenGl_GlCore20Fwd;
92 template<typename theBaseClass_t> struct OpenGl_TmplCore21;
93 typedef OpenGl_TmplCore21<OpenGl_GlCore20> OpenGl_GlCore21;
94 typedef OpenGl_TmplCore21<OpenGl_GlCore20Fwd> OpenGl_GlCore21Fwd;
96 template<typename theBaseClass_t> struct OpenGl_TmplCore30;
97 typedef OpenGl_TmplCore30<OpenGl_GlCore21> OpenGl_GlCore30;
98 typedef OpenGl_TmplCore30<OpenGl_GlCore21Fwd> OpenGl_GlCore30Fwd;
100 template<typename theBaseClass_t> struct OpenGl_TmplCore31;
101 typedef OpenGl_TmplCore31<OpenGl_GlCore30> OpenGl_GlCore31Back;
102 typedef OpenGl_TmplCore31<OpenGl_GlCore30Fwd> OpenGl_GlCore31;
104 template<typename theBaseClass_t> struct OpenGl_TmplCore32;
105 typedef OpenGl_TmplCore32<OpenGl_GlCore31Back> OpenGl_GlCore32Back;
106 typedef OpenGl_TmplCore32<OpenGl_GlCore31> OpenGl_GlCore32;
108 template<typename theBaseClass_t> struct OpenGl_TmplCore33;
109 typedef OpenGl_TmplCore33<OpenGl_GlCore32Back> OpenGl_GlCore33Back;
110 typedef OpenGl_TmplCore33<OpenGl_GlCore32> OpenGl_GlCore33;
112 template<typename theBaseClass_t> struct OpenGl_TmplCore40;
113 typedef OpenGl_TmplCore40<OpenGl_GlCore33Back> OpenGl_GlCore40Back;
114 typedef OpenGl_TmplCore40<OpenGl_GlCore33> OpenGl_GlCore40;
116 template<typename theBaseClass_t> struct OpenGl_TmplCore41;
117 typedef OpenGl_TmplCore41<OpenGl_GlCore40Back> OpenGl_GlCore41Back;
118 typedef OpenGl_TmplCore41<OpenGl_GlCore40> OpenGl_GlCore41;
120 template<typename theBaseClass_t> struct OpenGl_TmplCore42;
121 typedef OpenGl_TmplCore42<OpenGl_GlCore41Back> OpenGl_GlCore42Back;
122 typedef OpenGl_TmplCore42<OpenGl_GlCore41> OpenGl_GlCore42;
124 template<typename theBaseClass_t> struct OpenGl_TmplCore43;
125 typedef OpenGl_TmplCore43<OpenGl_GlCore42Back> OpenGl_GlCore43Back;
126 typedef OpenGl_TmplCore43<OpenGl_GlCore42> OpenGl_GlCore43;
128 template<typename theBaseClass_t> struct OpenGl_TmplCore44;
129 typedef OpenGl_TmplCore44<OpenGl_GlCore43Back> OpenGl_GlCore44Back;
130 typedef OpenGl_TmplCore44<OpenGl_GlCore43> OpenGl_GlCore44;
132 class OpenGl_ShaderManager;
133 class OpenGl_Sampler;
134 class OpenGl_FrameBuffer;
135 class OpenGl_AspectFace;
136 class Graphic3d_PresentationAttributes;
138 DEFINE_STANDARD_HANDLE(OpenGl_Context, Standard_Transient)
140 //! This class generalize access to the GL context and available extensions.
142 //! Functions related to specific OpenGL version or extension are grouped into structures which can be accessed as fields of this class.
143 //! The most simple way to check that required functionality is available - is NULL check for the group:
145 //! if (myContext->core20 != NULL)
147 //! myGlProgram = myContext->core20->glCreateProgram();
148 //! .. do more stuff ..
152 //! .. compatibility with outdated configurations ..
156 //! Current implementation provide access to OpenGL core functionality up to 4.4 version (core12, core13, core14, core15, fields core20)
157 //! as well as several extensions (arbTBO, arbFBO, etc.).
159 //! OpenGL context might be initialized in Core Profile. In this case deprecated functionality become unavailable.
160 //! To make code easily adaptable to wide range of OpenGL versions, function sets related to each version has two kinds of suffixes:
161 //! - "back" for version 3.2+.
162 //! Represents function set for Backward-Compatible Profile.
163 //! Function sets without this suffix represents core profile.
164 //! - "fwd" for version 3.0-.
165 //! Represents non-deprecated function set of earlier OpenGL versions, which are still available within OpenGL 3.2 Core Profile.
166 //! Function sets without this suffix represents complete list of functions related to specific OpenGL version.
168 //! To select which core** function set should be used in specific case:
169 //! - Determine the minimal OpenGL version required for implemented functionality and use it to access all functions.
170 //! For example, if algorithm requires OpenGL 2.1+, it is better to write core20fwd->glEnable() rather than core11fwd->glEnable() for uniformity.
171 //! - If functionality will work within Core Profile, use function sets with appropriate suffix.
172 //! - Validate minimal requirements at initialization/creation time and omit checks within code where algorithm should be already initialized.
173 //! Properly escape code incompatible with Core Profile. The simplest way to check Core Profile is "if (core11 == NULL)".
175 //! Simplified extensions classification:
176 //! - prefixed with NV, AMD, ATI are vendor-specific (however may be provided by other vendors in some cases);
177 //! - prefixed with EXT are accepted by 2+ vendors;
178 //! - prefixed with ARB are accepted by Architecture Review Board and are candidates
179 //! for inclusion into GL core functionality.
180 //! Some functionality can be represented in several extensions simultaneously.
181 //! In this case developer should be careful because different specification may differ
182 //! in aspects (like enumeration values and error-handling).
184 //! Notice that some systems provide mechanisms to simultaneously incorporate with GL contexts with different capabilities.
185 //! For this reason OpenGl_Context should be initialized and used for each GL context independently.
186 class OpenGl_Context : public Standard_Transient
188 DEFINE_STANDARD_RTTIEXT(OpenGl_Context, Standard_Transient)
189 friend class OpenGl_Window;
192 //! Function for getting power of to number larger or equal to input number.
193 //! @param theNumber number to 'power of two'
194 //! @param theThreshold upper threshold
195 //! @return power of two number
196 inline static Standard_Integer GetPowerOfTwo (const Standard_Integer theNumber,
197 const Standard_Integer theThreshold)
199 for (Standard_Integer p2 = 2; p2 <= theThreshold; p2 <<= 1)
211 //! Empty constructor. You should call Init() to perform initialization with bound GL context.
212 Standard_EXPORT OpenGl_Context (const Handle(OpenGl_Caps)& theCaps = NULL);
215 Standard_EXPORT virtual ~OpenGl_Context();
217 //! Release all resources, including shared ones
218 Standard_EXPORT void forcedRelease();
220 //! Share GL context resources.
221 //! theShareCtx - handle to context to retrieve handles to shared resources.
222 Standard_EXPORT void Share (const Handle(OpenGl_Context)& theShareCtx);
224 //! Initialize class from currently bound OpenGL context. Method should be called only once.
225 //! @return false if no GL context is bound to the current thread
226 Standard_EXPORT Standard_Boolean Init (const Standard_Boolean theIsCoreProfile = Standard_False);
228 //! @return true if this context is valid (has been initialized)
229 inline Standard_Boolean IsValid() const
231 return myIsInitialized;
234 #if defined(HAVE_EGL)
235 //! Initialize class from specified surface and rendering context. Method should be called only once.
236 //! @return false if OpenGL context can not be bound to specified surface
237 Standard_EXPORT Standard_Boolean Init (const Aspect_Drawable theEglSurface,
238 const Aspect_Display theEglDisplay,
239 const Aspect_RenderingContext theEglContext,
240 const Standard_Boolean theIsCoreProfile = Standard_False);
241 #elif defined(_WIN32)
242 //! Initialize class from specified window and rendering context. Method should be called only once.
243 //! @return false if OpenGL context can not be bound to specified window
244 Standard_EXPORT Standard_Boolean Init (const Aspect_Handle theWindow,
245 const Aspect_Handle theWindowDC,
246 const Aspect_RenderingContext theGContext,
247 const Standard_Boolean theIsCoreProfile = Standard_False);
249 //! @return the window handle (HWND) currently bound to this OpenGL context
250 inline Aspect_Handle Window() const
255 #elif defined(__APPLE__) && !defined(MACOSX_USE_GLX)
256 #if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
258 //! Initialize class from specified OpenGL ES context (EAGLContext). Method should be called only once.
259 Standard_EXPORT Standard_Boolean Init (EAGLContext* theGContext,
260 const Standard_Boolean theIsCoreProfile = Standard_False);
263 //! Initialize class from specified OpenGL context (NSOpenGLContext). Method should be called only once.
264 Standard_EXPORT Standard_Boolean Init (NSOpenGLContext* theGContext,
265 const Standard_Boolean theIsCoreProfile = Standard_False);
269 //! Initialize class from specified window and rendering context. Method should be called only once.
270 //! @return false if OpenGL context can not be bound to specified window
271 Standard_EXPORT Standard_Boolean Init (const Aspect_Drawable theWindow,
272 const Aspect_Display theDisplay,
273 const Aspect_RenderingContext theGContext,
274 const Standard_Boolean theIsCoreProfile = Standard_False);
276 //! @return the window handle (GLXDrawable) currently bound to this OpenGL context
277 inline Aspect_Drawable Window() const
283 //! Read OpenGL version information from active context.
284 Standard_EXPORT static void ReadGlVersion (Standard_Integer& theGlVerMajor,
285 Standard_Integer& theGlVerMinor);
287 //! Check if theExtName extension is supported by active GL context.
288 Standard_EXPORT Standard_Boolean CheckExtension (const char* theExtName) const;
290 //! Check if theExtName extension is in extensions string.
291 Standard_EXPORT static Standard_Boolean CheckExtension (const char* theExtString,
292 const char* theExtName);
294 //! Auxiliary template to retrieve GL function pointer.
295 //! Pointer to function retrieved from library is statically casted
296 //! to requested type - there no way to check real signature of exported function.
297 //! The context should be bound before call.
298 template <typename FuncType_t>
299 Standard_Boolean FindProc (const char* theFuncName,
300 FuncType_t& theFuncPtr)
302 theFuncPtr = (FuncType_t )findProc (theFuncName);
303 return (theFuncPtr != NULL);
306 //! @return true if detected GL version is greater or equal to requested one.
307 inline Standard_Boolean IsGlGreaterEqual (const Standard_Integer theVerMajor,
308 const Standard_Integer theVerMinor) const
310 return (myGlVerMajor > theVerMajor)
311 || (myGlVerMajor == theVerMajor && myGlVerMinor >= theVerMinor);
314 //! Return cached GL version major number.
315 Standard_Integer VersionMajor() const { return myGlVerMajor; }
317 //! Return cached GL version minor number.
318 Standard_Integer VersionMinor() const { return myGlVerMinor; }
320 //! Access entire map of loaded OpenGL functions.
321 const OpenGl_GlFunctions* Functions() const { return myFuncs.operator->(); }
323 //! Clean up errors stack for this GL context (glGetError() in loop).
324 //! @return true if some error has been cleared
325 Standard_EXPORT bool ResetErrors (const bool theToPrintErrors = false);
327 //! This method uses system-dependent API to retrieve information
328 //! about GL context bound to the current thread.
329 //! @return true if current thread is bound to this GL context
330 Standard_EXPORT Standard_Boolean IsCurrent() const;
332 //! Activates current context.
333 //! Class should be initialized with appropriate info.
334 Standard_EXPORT Standard_Boolean MakeCurrent();
336 //! Swap front/back buffers for this GL context (should be activated before!).
337 Standard_EXPORT void SwapBuffers();
339 //! Setup swap interval (VSync).
340 Standard_EXPORT Standard_Boolean SetSwapInterval (const Standard_Integer theInterval);
342 //! Return true if active mode is GL_RENDER (cached state)
343 Standard_Boolean IsRender() const
345 #if !defined(GL_ES_VERSION_2_0)
346 return myRenderMode == GL_RENDER;
348 return Standard_True;
352 //! Return true if active mode is GL_FEEDBACK (cached state)
353 Standard_Boolean IsFeedback() const
355 #if !defined(GL_ES_VERSION_2_0)
356 return myRenderMode == GL_FEEDBACK;
358 return Standard_False;
362 //! This function retrieves information from GL about free GPU memory that is:
363 //! - OS-dependent. On some OS it is per-process and on others - for entire system.
364 //! - Vendor-dependent. Currently available only on NVIDIA and AMD/ATi drivers only.
365 //! - Numbers meaning may vary.
366 //! You should use this info only for diagnostics purposes.
367 //! @return free GPU dedicated memory in bytes.
368 Standard_EXPORT Standard_Size AvailableMemory() const;
370 //! This function retrieves information from GL about GPU memory
371 //! and contains more vendor-specific values than AvailableMemory().
372 Standard_EXPORT TCollection_AsciiString MemoryInfo() const;
374 //! This function retrieves information from GL about GPU memory.
375 Standard_EXPORT void MemoryInfo (TColStd_IndexedDataMapOfStringString& theDict) const;
377 //! Fill in the dictionary with OpenGL info.
378 //! Should be called with bound context.
379 Standard_EXPORT void DiagnosticInformation (TColStd_IndexedDataMapOfStringString& theDict,
380 Graphic3d_DiagnosticInfo theFlags) const;
382 //! Access shared resource by its name.
383 //! @param theKey - unique identifier;
384 //! @return handle to shared resource or NULL.
385 Standard_EXPORT const Handle(OpenGl_Resource)& GetResource (const TCollection_AsciiString& theKey) const;
387 //! Access shared resource by its name.
388 //! @param theKey - unique identifier;
389 //! @param theValue - handle to fill;
390 //! @return true if resource was shared.
391 template<typename TheHandleType>
392 Standard_Boolean GetResource (const TCollection_AsciiString& theKey,
393 TheHandleType& theValue) const
395 const Handle(OpenGl_Resource)& aResource = GetResource (theKey);
396 if (aResource.IsNull())
398 return Standard_False;
401 theValue = TheHandleType::DownCast (aResource);
402 return !theValue.IsNull();
405 //! Register shared resource.
406 //! Notice that after registration caller shouldn't release it by himself -
407 //! it will be automatically released on context destruction.
408 //! @param theKey - unique identifier, shouldn't be empty;
409 //! @param theResource - new resource to register, shouldn't be NULL.
410 Standard_EXPORT Standard_Boolean ShareResource (const TCollection_AsciiString& theKey,
411 const Handle(OpenGl_Resource)& theResource);
413 //! Release shared resource.
414 //! If there are more than one reference to this resource
415 //! (also used by some other existing object) then call will be ignored.
416 //! This means that current object itself should nullify handle before this call.
417 //! Notice that this is unrecommended operation at all and should be used
418 //! only in case of fat resources to release memory for other needs.
419 //! @param theKey unique identifier
420 //! @param theToDelay postpone release until next redraw call
421 Standard_EXPORT void ReleaseResource (const TCollection_AsciiString& theKey,
422 const Standard_Boolean theToDelay = Standard_False);
424 //! Append resource to queue for delayed clean up.
425 //! Resources in this queue will be released at next redraw call.
427 void DelayedRelease (Handle(T)& theResource)
429 myUnusedResources->Prepend (theResource);
430 theResource.Nullify();
433 //! Clean up the delayed release queue.
434 Standard_EXPORT void ReleaseDelayed();
436 //! @return tool for management of clippings within this context.
437 inline OpenGl_Clipping& ChangeClipping() { return myClippingState; }
439 //! @return tool for management of clippings within this context.
440 inline const OpenGl_Clipping& Clipping() const { return myClippingState; }
442 //! @return tool for management of shader programs within this context.
443 inline const Handle(OpenGl_ShaderManager)& ShaderManager() const { return myShaderManager; }
447 //! Either GL_CLAMP_TO_EDGE (1.2+) or GL_CLAMP (1.1).
448 Standard_Integer TextureWrapClamp() const { return myTexClamp; }
450 //! @return maximum degree of anisotropy texture filter
451 Standard_Integer MaxDegreeOfAnisotropy() const { return myAnisoMax; }
453 //! @return value for GL_MAX_TEXTURE_SIZE
454 Standard_Integer MaxTextureSize() const { return myMaxTexDim; }
456 //! @return value for GL_MAX_SAMPLES
457 Standard_Integer MaxMsaaSamples() const { return myMaxMsaaSamples; }
459 //! Get maximum number of clip planes supported by OpenGl.
460 //! This value is implementation dependent. At least 6
461 //! planes should be supported by OpenGl (see specs).
462 //! @return value for GL_MAX_CLIP_PLANES
463 Standard_Integer MaxClipPlanes() const { return myMaxClipPlanes; }
465 //! @return TRUE if ray tracing mode is supported
466 Standard_Boolean HasRayTracing() const { return myHasRayTracing; }
468 //! @return TRUE if textures in ray tracing mode are supported
469 Standard_Boolean HasRayTracingTextures() const { return myHasRayTracingTextures; }
471 //! @return TRUE if adaptive screen sampling in ray tracing mode is supported
472 Standard_Boolean HasRayTracingAdaptiveSampling() const { return myHasRayTracingAdaptiveSampling; }
474 //! Returns true if VBO is supported and permitted.
475 inline bool ToUseVbo() const
477 return core15fwd != NULL
478 && !caps->vboDisable;
481 //! @return cached state of GL_NORMALIZE.
482 Standard_Boolean IsGlNormalizeEnabled() const { return myIsGlNormalizeEnabled; }
484 //! Sets GL_NORMALIZE enabled or disabled.
485 //! @return old value of the flag
486 Standard_EXPORT Standard_Boolean SetGlNormalizeEnabled (Standard_Boolean isEnabled);
488 //! @return cached state of polygon rasterization mode (glPolygonMode()).
489 Standard_Integer PolygonMode() const { return myPolygonMode; }
491 //! Sets polygon rasterization mode (glPolygonMode() function).
492 //! @return old value of the rasterization mode.
493 Standard_EXPORT Standard_Integer SetPolygonMode (const Standard_Integer theMode);
495 //! @return cached enabled state of polygon hatching rasterization.
496 bool IsPolygonHatchEnabled() const
498 return !myHatchStyles.IsNull() && myHatchStyles->TypeOfHatch() != 0;
501 //! Sets enabled state of polygon hatching rasterization
502 //! without affecting currently selected hatching pattern.
503 //! @return previous state of polygon hatching mode.
504 Standard_EXPORT bool SetPolygonHatchEnabled (const bool theIsEnabled);
506 //! @return cached state of polygon hatch type.
507 Standard_Integer PolygonHatchStyle() const
509 return myHatchStyles.IsNull() ? Aspect_HS_SOLID : myHatchStyles->TypeOfHatch();
512 //! Sets polygon hatch pattern.
513 //! Zero-index value is a default alias for solid filling.
514 //! @param the type of hatch supported by base implementation of
515 //! OpenGl_LineAttributes (Aspect_HatchStyle) or the type supported by custom
516 //! implementation derived from OpenGl_LineAttributes class.
517 //! @return old type of hatch.
518 Standard_EXPORT Standard_Integer SetPolygonHatchStyle (const Handle(Graphic3d_HatchStyle)& theStyle);
520 //! Applies matrix stored in ModelWorldState to OpenGl.
521 Standard_EXPORT void ApplyModelWorldMatrix();
523 //! Applies matrix stored in WorldViewState to OpenGl.
524 Standard_EXPORT void ApplyWorldViewMatrix();
526 //! Applies combination of matrices stored in ModelWorldState and WorldViewState to OpenGl.
527 Standard_EXPORT void ApplyModelViewMatrix();
529 //! Applies matrix stored in ProjectionState to OpenGl.
530 Standard_EXPORT void ApplyProjectionMatrix();
534 //! @return messenger instance
535 inline const Handle(Message_Messenger)& Messenger() const
537 return ::Message::DefaultMessenger();
540 //! Callback for GL_ARB_debug_output extension
541 //! @param theSource message source within GL_DEBUG_SOURCE_ enumeration
542 //! @param theType message type within GL_DEBUG_TYPE_ enumeration
543 //! @param theId message ID within source
544 //! @param theSeverity message severity within GL_DEBUG_SEVERITY_ enumeration
545 //! @param theMessage the message itself
546 Standard_EXPORT void PushMessage (const unsigned int theSource,
547 const unsigned int theType,
548 const unsigned int theId,
549 const unsigned int theSeverity,
550 const TCollection_ExtendedString& theMessage);
552 //! Adds a filter for messages with theId and theSource (GL_DEBUG_SOURCE_)
553 Standard_EXPORT Standard_Boolean ExcludeMessage (const unsigned int theSource,
554 const unsigned int theId);
556 //! Removes a filter for messages with theId and theSource (GL_DEBUG_SOURCE_)
557 Standard_EXPORT Standard_Boolean IncludeMessage (const unsigned int theSource,
558 const unsigned int theId);
560 //! @return true if OpenGl context supports left and
561 //! right rendering buffers.
562 Standard_Boolean HasStereoBuffers() const
564 #if !defined(GL_ES_VERSION_2_0)
565 return myIsStereoBuffers;
567 return Standard_False;
571 public: //! @name methods to alter or retrieve current state
573 //! Return cached viewport definition (x, y, width, height).
574 const Standard_Integer* Viewport() const { return myViewport; }
576 //! Resize the viewport (alias for glViewport).
577 //! @param theRect viewport definition (x, y, width, height)
578 Standard_EXPORT void ResizeViewport (const Standard_Integer theRect[4]);
580 //! Return active read buffer.
581 Standard_Integer ReadBuffer() { return myReadBuffer; }
583 //! Switch read buffer, wrapper for ::glReadBuffer().
584 Standard_EXPORT void SetReadBuffer (const Standard_Integer theReadBuffer);
586 //! Return active draw buffer.
587 Standard_Integer DrawBuffer() { return myDrawBuffer; }
589 //! Switch draw buffer, wrapper for ::glDrawBuffer().
590 Standard_EXPORT void SetDrawBuffer (const Standard_Integer theDrawBuffer);
592 //! Switch read/draw buffers.
593 void SetReadDrawBuffer (const Standard_Integer theBuffer)
595 SetReadBuffer (theBuffer);
596 SetDrawBuffer (theBuffer);
599 //! Return back face culling state.
600 bool ToCullBackFaces() const { return myToCullBackFaces; }
602 //! Enable or disable back face culling (glEnable (GL_CULL_FACE)).
603 Standard_EXPORT void SetCullBackFaces (bool theToEnable);
605 //! Fetch OpenGl context state. This class tracks value of several OpenGl
606 //! state variables. Consulting the cached values is quicker than
607 //! doing the same via OpenGl API. Call this method if any of the controlled
608 //! OpenGl state variables has a possibility of being out-of-date.
609 Standard_EXPORT void FetchState();
611 //! @return active GLSL program
612 const Handle(OpenGl_ShaderProgram)& ActiveProgram() const
614 return myActiveProgram;
617 //! @return OpenGL sampler object used to override default texture parameters
618 const Handle(OpenGl_Sampler)& TextureSampler()
623 //! Bind specified program to current context,
624 //! or unbind previous one when NULL specified.
625 //! @return true if some program is bound to context
626 Standard_EXPORT Standard_Boolean BindProgram (const Handle(OpenGl_ShaderProgram)& theProgram);
628 //! Setup current shading material.
629 Standard_EXPORT void SetShadingMaterial (const OpenGl_AspectFace* theAspect,
630 const Handle(Graphic3d_PresentationAttributes)& theHighlight,
631 const Standard_Boolean theUseDepthWrite);
633 //! Setup current color.
634 Standard_EXPORT void SetColor4fv (const OpenGl_Vec4& theColor);
636 //! Setup type of line.
637 Standard_EXPORT void SetTypeOfLine (const Aspect_TypeOfLine theType,
638 const Standard_ShortReal theFactor = 1.0f);
640 //! Setup width of line.
641 Standard_EXPORT void SetLineWidth (const Standard_ShortReal theWidth);
643 //! Setup point size.
644 Standard_EXPORT void SetPointSize (const Standard_ShortReal theSize);
646 //! Setup point sprite origin using GL_POINT_SPRITE_COORD_ORIGIN state:
647 //! - GL_UPPER_LEFT when GLSL program is active;
648 //! flipping should be handled in GLSL program for compatibility with OpenGL ES
649 //! - GL_LOWER_LEFT for FFP
650 Standard_EXPORT void SetPointSpriteOrigin();
652 //! Setup texture matrix to active GLSL program or to FFP global state using glMatrixMode (GL_TEXTURE).
653 Standard_EXPORT void SetTextureMatrix (const Handle(Graphic3d_TextureParams)& theParams);
655 //! Bind default Vertex Array Object
656 Standard_EXPORT void BindDefaultVao();
658 //! Default Frame Buffer Object.
659 const Handle(OpenGl_FrameBuffer)& DefaultFrameBuffer() const
664 //! Setup new Default Frame Buffer Object and return previously set.
665 //! This call doesn't change Active FBO!
666 Standard_EXPORT Handle(OpenGl_FrameBuffer) SetDefaultFrameBuffer (const Handle(OpenGl_FrameBuffer)& theFbo);
668 //! Return debug context initialization state.
669 Standard_Boolean IsDebugContext() const
671 return myIsGlDebugCtx;
674 Standard_EXPORT void EnableFeatures() const;
676 Standard_EXPORT void DisableFeatures() const;
678 //! Set resolution ratio.
679 //! Note that this method rounds @theRatio to nearest integer.
680 void SetResolutionRatio (const Standard_ShortReal theRatio)
682 myResolutionRatio = Max (1.0f, std::floor (theRatio + 0.5f));
687 //! Wrapper to system function to retrieve GL function pointer by name.
688 Standard_EXPORT void* findProc (const char* theFuncName);
690 //! Print error if not all functions have been exported by context for reported version.
691 //! Note that this will never happen when using GLX, since returned functions can not be validated.
692 //! @param theGlVerMajor the OpenGL major version with missing functions
693 //! @param theGlVerMinor the OpenGL minor version with missing functions
694 Standard_EXPORT void checkWrongVersion (const Standard_Integer theGlVerMajor,
695 const Standard_Integer theGlVerMinor);
697 //! Private initialization function that should be called only once.
698 Standard_EXPORT void init (const Standard_Boolean theIsCoreProfile);
700 public: //! @name core profiles
702 OpenGl_GlCore11* core11; //!< OpenGL 1.1 core functionality
703 OpenGl_GlCore11Fwd* core11fwd; //!< OpenGL 1.1 without deprecated entry points
704 OpenGl_GlCore15* core15; //!< OpenGL 1.5 core functionality
705 OpenGl_GlCore15Fwd* core15fwd; //!< OpenGL 1.5 without deprecated entry points
706 OpenGl_GlCore20* core20; //!< OpenGL 2.0 core functionality (includes 1.5)
707 OpenGl_GlCore20Fwd* core20fwd; //!< OpenGL 2.0 without deprecated entry points
708 OpenGl_GlCore32* core32; //!< OpenGL 3.2 core profile
709 OpenGl_GlCore32Back* core32back; //!< OpenGL 3.2 backward compatibility profile
710 OpenGl_GlCore33* core33; //!< OpenGL 3.3 core profile
711 OpenGl_GlCore33Back* core33back; //!< OpenGL 3.3 backward compatibility profile
712 OpenGl_GlCore41* core41; //!< OpenGL 4.1 core profile
713 OpenGl_GlCore41Back* core41back; //!< OpenGL 4.1 backward compatibility profile
714 OpenGl_GlCore42* core42; //!< OpenGL 4.2 core profile
715 OpenGl_GlCore42Back* core42back; //!< OpenGL 4.2 backward compatibility profile
716 OpenGl_GlCore43* core43; //!< OpenGL 4.3 core profile
717 OpenGl_GlCore43Back* core43back; //!< OpenGL 4.3 backward compatibility profile
718 OpenGl_GlCore44* core44; //!< OpenGL 4.4 core profile
719 OpenGl_GlCore44Back* core44back; //!< OpenGL 4.4 backward compatibility profile
721 Handle(OpenGl_Caps) caps; //!< context options
723 public: //! @name extensions
725 Standard_Boolean hasHighp; //!< highp in GLSL ES fragment shader is supported
726 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)
727 Standard_Boolean hasTexRGBA8; //!< always available on desktop; on OpenGL ES - since 3.0 or as extension GL_OES_rgb8_rgba8
728 Standard_Boolean arbNPTW; //!< GL_ARB_texture_non_power_of_two
729 Standard_Boolean arbTexRG; //!< GL_ARB_texture_rg
730 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)
731 OpenGl_ArbTexBindless* arbTexBindless; //!< GL_ARB_bindless_texture
732 OpenGl_ArbTBO* arbTBO; //!< GL_ARB_texture_buffer_object
733 Standard_Boolean arbTboRGB32; //!< GL_ARB_texture_buffer_object_rgb32 (3-component TBO), in core since 4.0
734 OpenGl_ArbIns* arbIns; //!< GL_ARB_draw_instanced
735 OpenGl_ArbDbg* arbDbg; //!< GL_ARB_debug_output
736 OpenGl_ArbFBO* arbFBO; //!< GL_ARB_framebuffer_object
737 OpenGl_ArbFBOBlit* arbFBOBlit; //!< glBlitFramebuffer function, moved out from OpenGl_ArbFBO structure for compatibility with OpenGL ES 2.0
738 Standard_Boolean extFragDepth; //!< GL_EXT_frag_depth on OpenGL ES 2.0 (gl_FragDepthEXT built-in variable, before OpenGL ES 3.0)
739 OpenGl_ExtGS* extGS; //!< GL_EXT_geometry_shader4
740 Standard_Boolean extBgra; //!< GL_EXT_bgra or GL_EXT_texture_format_BGRA8888 on OpenGL ES
741 Standard_Boolean extAnis; //!< GL_EXT_texture_filter_anisotropic
742 Standard_Boolean extPDS; //!< GL_EXT_packed_depth_stencil
743 Standard_Boolean atiMem; //!< GL_ATI_meminfo
744 Standard_Boolean nvxMem; //!< GL_NVX_gpu_memory_info
746 public: //! @name public properties tracking current state
748 OpenGl_MatrixState<Standard_ShortReal> ModelWorldState; //!< state of orientation matrix
749 OpenGl_MatrixState<Standard_ShortReal> WorldViewState; //!< state of orientation matrix
750 OpenGl_MatrixState<Standard_ShortReal> ProjectionState; //!< state of projection matrix
752 private: // system-dependent fields
754 #if defined(HAVE_EGL)
755 Aspect_Drawable myWindow; //!< EGL surface : EGLSurface
756 Aspect_Display myDisplay; //!< EGL connection to the Display : EGLDisplay
757 Aspect_RenderingContext myGContext; //!< EGL rendering context : EGLContext
758 #elif defined(_WIN32)
759 Aspect_Handle myWindow; //!< window handle (owner of GL context) : HWND
760 Aspect_Handle myWindowDC; //!< Device Descriptor handle : HDC
761 Aspect_RenderingContext myGContext; //!< Rendering Context handle : HGLRC
762 #elif defined(__APPLE__) && !defined(MACOSX_USE_GLX)
763 #if defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
764 EAGLContext* myGContext; //!< Rendering Context handle
766 NSOpenGLContext* myGContext; //!< Rendering Context handle
769 Aspect_Drawable myWindow; //!< window handle (owner of GL context) : GLXDrawable
770 Aspect_Display myDisplay; //!< connection to the X-server : Display*
771 Aspect_RenderingContext myGContext; //!< X-GLX rendering context : GLXContext
774 private: // context info
776 typedef NCollection_Shared< NCollection_DataMap<TCollection_AsciiString, Standard_Integer> > OpenGl_DelayReleaseMap;
777 typedef NCollection_Shared< NCollection_DataMap<TCollection_AsciiString, Handle(OpenGl_Resource)> > OpenGl_ResourcesMap;
778 typedef NCollection_Shared< NCollection_List<Handle(OpenGl_Resource)> > OpenGl_ResourcesStack;
780 Handle(OpenGl_ResourcesMap) mySharedResources; //!< shared resources with unique identification key
781 Handle(OpenGl_DelayReleaseMap) myDelayed; //!< shared resources for delayed release
782 Handle(OpenGl_ResourcesStack) myUnusedResources; //!< stack of resources for delayed clean up
784 OpenGl_Clipping myClippingState; //!< state of clip planes
786 void* myGlLibHandle; //!< optional handle to GL library
787 NCollection_Handle<OpenGl_GlFunctions>
788 myFuncs; //!< mega structure for all GL functions
789 Standard_Integer myAnisoMax; //!< maximum level of anisotropy texture filter
790 Standard_Integer myTexClamp; //!< either GL_CLAMP_TO_EDGE (1.2+) or GL_CLAMP (1.1)
791 Standard_Integer myMaxTexDim; //!< value for GL_MAX_TEXTURE_SIZE
792 Standard_Integer myMaxClipPlanes; //!< value for GL_MAX_CLIP_PLANES
793 Standard_Integer myMaxMsaaSamples; //!< value for GL_MAX_SAMPLES
794 Standard_Integer myGlVerMajor; //!< cached GL version major number
795 Standard_Integer myGlVerMinor; //!< cached GL version minor number
796 Standard_Boolean myIsInitialized; //!< flag indicates initialization state
797 Standard_Boolean myIsStereoBuffers; //!< context supports stereo buffering
798 Standard_Boolean myIsGlNormalizeEnabled; //!< GL_NORMALIZE flag
799 //!< Used to tell OpenGl that normals should be normalized
801 Standard_Boolean myHasRayTracing; //! indicates whether ray tracing mode is supported
802 Standard_Boolean myHasRayTracingTextures; //! indicates whether textures in ray tracing mode are supported
803 Standard_Boolean myHasRayTracingAdaptiveSampling; //! indicates whether adaptive screen sampling in ray tracing mode is supported
805 Handle(OpenGl_ShaderManager) myShaderManager; //! support object for managing shader programs
807 private: //! @name fields tracking current state
809 Handle(OpenGl_ShaderProgram) myActiveProgram; //!< currently active GLSL program
810 Handle(OpenGl_Sampler) myTexSampler; //!< currently active sampler object
811 Handle(OpenGl_FrameBuffer) myDefaultFbo; //!< default Frame Buffer Object
812 Handle(OpenGl_LineAttributes) myHatchStyles; //!< resource holding predefined hatch styles patterns
813 Standard_Integer myViewport[4]; //!< current viewport
814 Standard_Integer myPointSpriteOrig; //!< GL_POINT_SPRITE_COORD_ORIGIN state (GL_UPPER_LEFT by default)
815 Standard_Integer myRenderMode; //!< value for active rendering mode
816 Standard_Integer myPolygonMode; //!< currently used polygon rasterization mode (glPolygonMode)
817 bool myToCullBackFaces; //!< back face culling mode enabled state (glIsEnabled (GL_CULL_FACE))
818 Standard_Integer myReadBuffer; //!< current read buffer
819 Standard_Integer myDrawBuffer; //!< current draw buffer
820 unsigned int myDefaultVao; //!< default Vertex Array Object
821 Standard_Boolean myIsGlDebugCtx; //!< debug context initialization state
822 TCollection_AsciiString myVendor; //!< Graphics Driver's vendor
823 TColStd_PackedMapOfInteger myFilters[6]; //!< messages suppressing filter (for sources from GL_DEBUG_SOURCE_API_ARB to GL_DEBUG_SOURCE_OTHER_ARB)
824 Standard_ShortReal myResolutionRatio; //!< scaling factor for parameters like text size
825 //!< to be properly displayed on device (screen / printer)
826 OpenGl_Material myMatFront; //!< current front material state (cached to reduce GL context updates)
827 OpenGl_Material myMatBack; //!< current back material state
831 //! Copying allowed only within Handles
832 OpenGl_Context (const OpenGl_Context& );
833 OpenGl_Context& operator= (const OpenGl_Context& );
837 #endif // _OpenGl_Context_H__