0030483: Visualization, Path Tracing - make Tile Size configurable
[occt.git] / src / OpenGl / OpenGl_View.hxx
1 // Created on: 2011-09-20
2 // Created by: Sergey ZERCHANINOV
3 // Copyright (c) 2011-2014 OPEN CASCADE SAS
4 //
5 // This file is part of Open CASCADE Technology software library.
6 //
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.
12 //
13 // Alternatively, this file may be used under the terms of Open CASCADE
14 // commercial license or contractual agreement.
15
16 #ifndef _OpenGl_View_Header
17 #define _OpenGl_View_Header
18
19 #include <Standard_Transient.hxx>
20 #include <Standard_Type.hxx>
21
22 #include <TColStd_Array2OfReal.hxx>
23 #include <NCollection_List.hxx>
24 #include <math_BullardGenerator.hxx>
25
26 #include <Quantity_NameOfColor.hxx>
27 #include <Aspect_FillMethod.hxx>
28 #include <Aspect_GradientFillMethod.hxx>
29
30 #include <Graphic3d_CView.hxx>
31 #include <Graphic3d_GraduatedTrihedron.hxx>
32 #include <Graphic3d_SequenceOfHClipPlane.hxx>
33 #include <Graphic3d_ToneMappingMethod.hxx>
34 #include <Graphic3d_TypeOfShadingModel.hxx>
35 #include <Graphic3d_WorldViewProjState.hxx>
36 #include <Graphic3d_ZLayerSettings.hxx>
37
38 #include <OpenGl_AspectFace.hxx>
39 #include <OpenGl_BackgroundArray.hxx>
40 #include <OpenGl_BVHTreeSelector.hxx>
41 #include <OpenGl_Context.hxx>
42 #include <OpenGl_FrameBuffer.hxx>
43 #include <OpenGl_FrameStatsPrs.hxx>
44 #include <OpenGl_GraduatedTrihedron.hxx>
45 #include <OpenGl_LayerList.hxx>
46 #include <OpenGl_LineAttributes.hxx>
47 #include <OpenGl_SceneGeometry.hxx>
48 #include <OpenGl_Structure.hxx>
49 #include <OpenGl_Window.hxx>
50 #include <OpenGl_Workspace.hxx>
51 #include <OpenGl_TileSampler.hxx>
52
53 #include <map>
54 #include <set>
55
56 struct OpenGl_Matrix;
57
58 class Graphic3d_StructureManager;
59 class OpenGl_GraphicDriver;
60 class OpenGl_StateCounter;
61 class OpenGl_RaytraceMaterial;
62 class OpenGl_TriangleSet;
63 class OpenGl_Workspace;
64 class OpenGl_View;
65 DEFINE_STANDARD_HANDLE(OpenGl_View,Graphic3d_CView)
66
67 //! Implementation of OpenGl view.
68 class OpenGl_View : public Graphic3d_CView
69 {
70
71 public:
72
73   //! Constructor.
74   Standard_EXPORT OpenGl_View (const Handle(Graphic3d_StructureManager)& theMgr,
75                                const Handle(OpenGl_GraphicDriver)& theDriver,
76                                const Handle(OpenGl_Caps)& theCaps,
77                                OpenGl_StateCounter* theCounter);
78
79   //! Default destructor.
80   Standard_EXPORT virtual ~OpenGl_View();
81
82   Standard_EXPORT void ReleaseGlResources (const Handle(OpenGl_Context)& theCtx);
83
84   //! Deletes and erases the view.
85   Standard_EXPORT virtual void Remove() Standard_OVERRIDE;
86
87   //! @param theDrawToFrontBuffer Advanced option to modify rendering mode:
88   //! 1. TRUE.  Drawing immediate mode structures directly to the front buffer over the scene image.
89   //! Fast, so preferred for interactive work (used by default).
90   //! However these extra drawings will be missed in image dump since it is performed from back buffer.
91   //! Notice that since no pre-buffering used the V-Sync will be ignored and rendering could be seen
92   //! in run-time (in case of slow hardware) and/or tearing may appear.
93   //! So this is strongly recommended to draw only simple (fast) structures.
94   //! 2. FALSE. Drawing immediate mode structures to the back buffer.
95   //! The complete scene is redrawn first, so this mode is slower if scene contains complex data and/or V-Sync
96   //! is turned on. But it works in any case and is especially useful for view dump because the dump image is read
97   //! from the back buffer.
98   //! @return previous mode.
99   Standard_EXPORT Standard_Boolean SetImmediateModeDrawToFront (const Standard_Boolean theDrawToFrontBuffer) Standard_OVERRIDE;
100
101   //! Creates and maps rendering window to the view.
102   //! @param theWindow [in] the window.
103   //! @param theContext [in] the rendering context. If NULL the context will be created internally.
104   Standard_EXPORT virtual void SetWindow (const Handle(Aspect_Window)&  theWindow,
105                                           const Aspect_RenderingContext theContext) Standard_OVERRIDE;
106
107   //! Returns window associated with the view.
108   virtual Handle(Aspect_Window) Window() const Standard_OVERRIDE
109   { return myWindow->PlatformWindow(); }
110
111   //! Returns True if the window associated to the view is defined.
112   virtual Standard_Boolean IsDefined() const Standard_OVERRIDE
113   { return !myWindow.IsNull(); }
114
115   //! Handle changing size of the rendering window.
116   Standard_EXPORT virtual void Resized() Standard_OVERRIDE;
117
118   //! Redraw content of the view.
119   Standard_EXPORT virtual void Redraw() Standard_OVERRIDE;
120
121   //! Redraw immediate content of the view.
122   Standard_EXPORT virtual void RedrawImmediate() Standard_OVERRIDE;
123
124   //! Marks BVH tree for given priority list as dirty and marks primitive set for rebuild.
125   Standard_EXPORT virtual void Invalidate() Standard_OVERRIDE;
126
127   //! Return true if view content cache has been invalidated.
128   virtual Standard_Boolean IsInvalidated() Standard_OVERRIDE { return !myBackBufferRestored; }
129
130   //! Returns data of a graduated trihedron
131   const Graphic3d_GraduatedTrihedron& GetGraduatedTrihedron() Standard_OVERRIDE
132   { return myGTrihedronData; }
133
134   //! Displays Graduated Trihedron.
135   Standard_EXPORT virtual void GraduatedTrihedronDisplay (const Graphic3d_GraduatedTrihedron& theTrihedronData) Standard_OVERRIDE;
136
137   //! Erases Graduated Trihedron.
138   Standard_EXPORT virtual void GraduatedTrihedronErase() Standard_OVERRIDE;
139
140   //! Sets minimum and maximum points of scene bounding box for Graduated Trihedron stored in graphic view object.
141   //! @param theMin [in] the minimum point of scene.
142   //! @param theMax [in] the maximum point of scene.
143   Standard_EXPORT virtual void GraduatedTrihedronMinMaxValues (const Graphic3d_Vec3 theMin, const Graphic3d_Vec3 theMax) Standard_OVERRIDE;
144
145   //! Dump active rendering buffer into specified memory buffer.
146   //! In Ray-Tracing allow to get a raw HDR buffer using Graphic3d_BT_RGB_RayTraceHdrLeft buffer type,
147   //! only Left view will be dumped ignoring stereoscopic parameter.
148   Standard_EXPORT virtual Standard_Boolean BufferDump (Image_PixMap& theImage,
149                                                        const Graphic3d_BufferType& theBufferType) Standard_OVERRIDE;
150
151   //! Marks BVH tree and the set of BVH primitives of correspondent priority list with id theLayerId as outdated.
152   Standard_EXPORT virtual void InvalidateBVHData (const Graphic3d_ZLayerId theLayerId) Standard_OVERRIDE;
153
154   //! Insert a new top-level z layer with the given ID.
155   Standard_EXPORT virtual void AddZLayer (const Graphic3d_ZLayerId theLayerId) Standard_OVERRIDE;
156
157   //! Remove a z layer with the given ID.
158   Standard_EXPORT virtual void RemoveZLayer (const Graphic3d_ZLayerId theLayerId) Standard_OVERRIDE;
159
160   //! Sets the settings for a single Z layer of specified view.
161   Standard_EXPORT virtual void SetZLayerSettings (const Graphic3d_ZLayerId theLayerId,
162                                                   const Graphic3d_ZLayerSettings& theSettings) Standard_OVERRIDE;
163
164   //! Returns the maximum Z layer ID.
165   //! First layer ID is Graphic3d_ZLayerId_Default, last ID is ZLayerMax().
166   Standard_EXPORT virtual Standard_Integer ZLayerMax() const Standard_OVERRIDE;
167
168   //! Returns the bounding box of all structures displayed in the Z layer.
169   //! Never fails. If Z layer does not exist nothing happens.
170   Standard_EXPORT virtual void InvalidateZLayerBoundingBox (const Graphic3d_ZLayerId theLayerId) const Standard_OVERRIDE;
171
172   //! Returns the bounding box of all structures displayed in the Z layer.
173   //! If Z layer does not exist the empty box is returned.
174   //! @param theLayerId            layer identifier
175   //! @param theCamera             camera definition
176   //! @param theWindowWidth        viewport width  (for applying transformation-persistence)
177   //! @param theWindowHeight       viewport height (for applying transformation-persistence)
178   //! @param theToIncludeAuxiliary consider also auxiliary presentations (with infinite flag or with trihedron transformation persistence)
179   //! @return computed bounding box
180   Standard_EXPORT virtual Bnd_Box ZLayerBoundingBox (const Graphic3d_ZLayerId        theLayerId,
181                                                      const Handle(Graphic3d_Camera)& theCamera,
182                                                      const Standard_Integer          theWindowWidth,
183                                                      const Standard_Integer          theWindowHeight,
184                                                      const Standard_Boolean          theToIncludeAuxiliary) const Standard_OVERRIDE;
185
186   //! Returns pointer to an assigned framebuffer object.
187   Standard_EXPORT virtual Handle(Standard_Transient) FBO() const Standard_OVERRIDE;
188
189   //! Sets framebuffer object for offscreen rendering.
190   Standard_EXPORT virtual void SetFBO (const Handle(Standard_Transient)& theFbo) Standard_OVERRIDE;
191
192   //! Generate offscreen FBO in the graphic library.
193   //! If not supported on hardware returns NULL.
194   Standard_EXPORT virtual Handle(Standard_Transient) FBOCreate (const Standard_Integer theWidth,
195                                                                 const Standard_Integer theHeight) Standard_OVERRIDE;
196
197   //! Remove offscreen FBO from the graphic library
198   Standard_EXPORT virtual void FBORelease (Handle(Standard_Transient)& theFbo) Standard_OVERRIDE;
199
200   //! Read offscreen FBO configuration.
201   Standard_EXPORT virtual void FBOGetDimensions (const Handle(Standard_Transient)& theFbo,
202                                                  Standard_Integer& theWidth,
203                                                  Standard_Integer& theHeight,
204                                                  Standard_Integer& theWidthMax,
205                                                  Standard_Integer& theHeightMax) Standard_OVERRIDE;
206
207   //! Change offscreen FBO viewport.
208   Standard_EXPORT virtual void FBOChangeViewport (const Handle(Standard_Transient)& theFbo,
209                                                   const Standard_Integer theWidth,
210                                                   const Standard_Integer theHeight) Standard_OVERRIDE;
211
212 public:
213
214   //! Returns background  fill color.
215   Standard_EXPORT virtual Aspect_Background Background() const Standard_OVERRIDE;
216
217   //! Sets background fill color.
218   Standard_EXPORT virtual void SetBackground (const Aspect_Background& theBackground) Standard_OVERRIDE;
219
220   //! Returns gradient background fill colors.
221   Standard_EXPORT virtual Aspect_GradientBackground GradientBackground() const Standard_OVERRIDE;
222
223   //! Sets gradient background fill colors.
224   Standard_EXPORT virtual void SetGradientBackground (const Aspect_GradientBackground& theBackground) Standard_OVERRIDE;
225
226   //! Returns background image texture file path.
227   virtual TCollection_AsciiString BackgroundImage() Standard_OVERRIDE { return myBackgroundImagePath; }
228
229   //! Sets background image texture file path.
230   Standard_EXPORT virtual void SetBackgroundImage (const TCollection_AsciiString& theFilePath) Standard_OVERRIDE;
231
232   //! Returns background image fill style.
233   Standard_EXPORT virtual Aspect_FillMethod BackgroundImageStyle() const Standard_OVERRIDE;
234
235   //! Sets background image fill style.
236   Standard_EXPORT virtual void SetBackgroundImageStyle (const Aspect_FillMethod theFillStyle) Standard_OVERRIDE;
237
238   //! Returns environment texture set for the view.
239   virtual Handle(Graphic3d_TextureEnv) TextureEnv() const Standard_OVERRIDE { return myTextureEnvData; }
240
241   //! Sets environment texture for the view.
242   Standard_EXPORT virtual void SetTextureEnv (const Handle(Graphic3d_TextureEnv)& theTextureEnv) Standard_OVERRIDE;
243
244   //! Return backfacing model used for the view.
245   virtual Graphic3d_TypeOfBackfacingModel BackfacingModel() const Standard_OVERRIDE { return myBackfacing; }
246
247   //! Sets backfacing model for the view.
248   virtual void SetBackfacingModel (const Graphic3d_TypeOfBackfacingModel theModel) Standard_OVERRIDE { myBackfacing = theModel; }
249
250   //! Returns camera object of the view.
251   virtual const Handle(Graphic3d_Camera)& Camera() const Standard_OVERRIDE { return myCamera; }
252
253   //! Returns local camera origin currently set for rendering, might be modified during rendering.
254   const gp_XYZ& LocalOrigin() const { return myLocalOrigin; }
255
256   //! Setup local camera origin currently set for rendering.
257   Standard_EXPORT void SetLocalOrigin (const gp_XYZ& theOrigin);
258
259   //! Sets camera used by the view.
260   Standard_EXPORT virtual void SetCamera (const Handle(Graphic3d_Camera)& theCamera) Standard_OVERRIDE;
261
262   //! Returns list of lights of the view.
263   virtual const Handle(Graphic3d_LightSet)& Lights() const Standard_OVERRIDE { return myLights; }
264
265   //! Sets list of lights for the view.
266   virtual void SetLights (const Handle(Graphic3d_LightSet)& theLights) Standard_OVERRIDE
267   {
268     myLights = theLights;
269     myCurrLightSourceState = myStateCounter->Increment();
270   }
271
272   //! Returns list of clip planes set for the view.
273   virtual const Handle(Graphic3d_SequenceOfHClipPlane)& ClipPlanes() const Standard_OVERRIDE { return myClipPlanes; }
274
275   //! Sets list of clip planes for the view.
276   virtual void SetClipPlanes (const Handle(Graphic3d_SequenceOfHClipPlane)& thePlanes) Standard_OVERRIDE { myClipPlanes = thePlanes; }
277
278   //! Fill in the dictionary with diagnostic info.
279   //! Should be called within rendering thread.
280   //!
281   //! This API should be used only for user output or for creating automated reports.
282   //! The format of returned information (e.g. key-value layout)
283   //! is NOT part of this API and can be changed at any time.
284   //! Thus application should not parse returned information to weed out specific parameters.
285   Standard_EXPORT virtual void DiagnosticInformation (TColStd_IndexedDataMapOfStringString& theDict,
286                                                       Graphic3d_DiagnosticInfo theFlags) const Standard_OVERRIDE;
287
288   //! Returns string with statistic performance info.
289   Standard_EXPORT virtual TCollection_AsciiString StatisticInformation() const Standard_OVERRIDE;
290
291   //! Fills in the dictionary with statistic performance info.
292   Standard_EXPORT virtual void StatisticInformation (TColStd_IndexedDataMapOfStringString& theDict) const Standard_OVERRIDE;
293
294 public:
295
296   //! Returns background color.
297   const Quantity_ColorRGBA& BackgroundColor() const { return myBgColor; }
298
299   //! Change graduated trihedron.
300   OpenGl_GraduatedTrihedron& ChangeGraduatedTrihedron() { return myGraduatedTrihedron; }
301
302   void SetTextureEnv (const Handle(OpenGl_Context)&       theCtx,
303                       const Handle(Graphic3d_TextureEnv)& theTexture);
304
305   void SetBackgroundTextureStyle (const Aspect_FillMethod FillStyle);
306
307   void SetBackgroundGradient (const Quantity_Color& AColor1, const Quantity_Color& AColor2, const Aspect_GradientFillMethod AType);
308
309   void SetBackgroundGradientType (const Aspect_GradientFillMethod AType);
310
311   //! Returns list of OpenGL Z-layers.
312   const OpenGl_LayerList& LayerList() const { return myZLayers; }
313
314   //! Returns OpenGL window implementation.
315   const Handle(OpenGl_Window)& GlWindow() const { return myWindow; }
316
317   //! Returns OpenGL environment map.
318   const Handle(OpenGl_TextureSet)& GlTextureEnv() const { return myTextureEnv; }
319
320   //! Returns selector for BVH tree, providing a possibility to store information
321   //! about current view volume and to detect which objects are overlapping it.
322   const OpenGl_BVHTreeSelector& BVHTreeSelector() const { return myBVHSelector; }
323
324   //! Returns true if there are immediate structures to display
325   bool HasImmediateStructures() const
326   {
327     return myZLayers.NbImmediateStructures() != 0;
328   }
329
330 protected: //! @name Internal methods for managing GL resources
331
332   //! Initializes OpenGl resource for environment texture.
333   void initTextureEnv (const Handle(OpenGl_Context)& theContext);
334
335 protected: //! @name low-level redrawing sub-routines
336
337   //! Redraws view for the given monographic camera projection, or left/right eye.
338   Standard_EXPORT virtual void redraw (const Graphic3d_Camera::Projection theProjection,
339                                        OpenGl_FrameBuffer*                theReadDrawFbo,
340                                        OpenGl_FrameBuffer*                theOitAccumFbo);
341
342   //! Redraws view for the given monographic camera projection, or left/right eye.
343   //!
344   //! Method will blit snapshot containing main scene (myMainSceneFbos or BackBuffer)
345   //! into presentation buffer (myMainSceneFbos -> offscreen FBO or
346   //! myMainSceneFbos -> BackBuffer or BackBuffer -> FrontBuffer),
347   //! and redraw immediate structures on top.
348   //!
349   //! When scene caching is disabled (myTransientDrawToFront, no double buffer in window, etc.),
350   //! the first step (blitting) will be skipped.
351   //!
352   //! @return false if immediate structures has been rendered directly into FrontBuffer
353   //! and Buffer Swap should not be called.
354   Standard_EXPORT virtual bool redrawImmediate (const Graphic3d_Camera::Projection theProjection,
355                                                 OpenGl_FrameBuffer* theReadFbo,
356                                                 OpenGl_FrameBuffer* theDrawFbo,
357                                                 OpenGl_FrameBuffer* theOitAccumFbo,
358                                                 const Standard_Boolean theIsPartialUpdate = Standard_False);
359
360   //! Blit image from/to specified buffers.
361   Standard_EXPORT bool blitBuffers (OpenGl_FrameBuffer*    theReadFbo,
362                                     OpenGl_FrameBuffer*    theDrawFbo,
363                                     const Standard_Boolean theToFlip = Standard_False);
364
365   //! Setup default FBO.
366   Standard_EXPORT void bindDefaultFbo (OpenGl_FrameBuffer* theCustomFbo = NULL);
367
368 protected: //! @name Rendering of GL graphics (with prepared drawing buffer).
369
370   //! Renders the graphical contents of the view into the preprepared window or framebuffer.
371   //! @param theProjection [in] the projection that should be used for rendering.
372   //! @param theReadDrawFbo [in] the framebuffer for rendering graphics.
373   //! @param theOitAccumFbo [in] the framebuffer for accumulating color and coverage for OIT process.
374   //! @param theToDrawImmediate [in] the flag indicates whether the rendering performs in immediate mode.
375   Standard_EXPORT virtual void render (Graphic3d_Camera::Projection theProjection,
376                                        OpenGl_FrameBuffer*          theReadDrawFbo,
377                                        OpenGl_FrameBuffer*          theOitAccumFbo,
378                                        const Standard_Boolean       theToDrawImmediate);
379
380   //! Renders the graphical scene.
381   //! @param theProjection [in] the projection that is used for rendering.
382   //! @param theReadDrawFbo [in] the framebuffer for rendering graphics.
383   //! @param theOitAccumFbo [in] the framebuffer for accumulating color and coverage for OIT process.
384   //! @param theToDrawImmediate [in] the flag indicates whether the rendering performs in immediate mode.
385   Standard_EXPORT virtual void renderScene (Graphic3d_Camera::Projection theProjection,
386                                             OpenGl_FrameBuffer*    theReadDrawFbo,
387                                             OpenGl_FrameBuffer*    theOitAccumFbo,
388                                             const Standard_Boolean theToDrawImmediate);
389
390   //! Draw background (gradient / image)
391   Standard_EXPORT virtual void drawBackground (const Handle(OpenGl_Workspace)& theWorkspace);
392
393   //! Render set of structures presented in the view.
394   //! @param theProjection [in] the projection that is used for rendering.
395   //! @param theReadDrawFbo [in] the framebuffer for rendering graphics.
396   //! @param theOitAccumFbo [in] the framebuffer for accumulating color and coverage for OIT process.
397   //! @param theToDrawImmediate [in] the flag indicates whether the rendering performs in immediate mode.
398   Standard_EXPORT virtual void renderStructs (Graphic3d_Camera::Projection theProjection,
399                                               OpenGl_FrameBuffer*    theReadDrawFbo,
400                                               OpenGl_FrameBuffer*    theOitAccumFbo,
401                                               const Standard_Boolean theToDrawImmediate);
402
403   //! Renders trihedron.
404   void renderTrihedron (const Handle(OpenGl_Workspace) &theWorkspace);
405
406   //! Renders frame statistics.
407   void renderFrameStats();
408
409 private:
410
411   //! Adds the structure to display lists of the view.
412   Standard_EXPORT virtual void displayStructure (const Handle(Graphic3d_CStructure)& theStructure,
413                                                  const Standard_Integer thePriority) Standard_OVERRIDE;
414
415   //! Erases the structure from display lists of the view.
416   Standard_EXPORT virtual void eraseStructure (const Handle(Graphic3d_CStructure)& theStructure) Standard_OVERRIDE;
417
418   //! Change Z layer of a structure already presented in view.
419   Standard_EXPORT virtual void changeZLayer (const Handle(Graphic3d_CStructure)& theCStructure,
420                                              const Graphic3d_ZLayerId theNewLayerId) Standard_OVERRIDE;
421
422   //! Changes the priority of a structure within its Z layer in the specified view.
423   Standard_EXPORT virtual void changePriority (const Handle(Graphic3d_CStructure)& theCStructure,
424                                                const Standard_Integer theNewPriority) Standard_OVERRIDE;
425
426   //! Returns zoom-scale factor.
427   Standard_EXPORT virtual Standard_Real considerZoomPersistenceObjects (const Graphic3d_ZLayerId        theLayerId,
428                                                                         const Handle(Graphic3d_Camera)& theCamera,
429                                                                         const Standard_Integer          theWindowWidth,
430                                                                         const Standard_Integer          theWindowHeight) const Standard_OVERRIDE;
431
432 private:
433
434   //! Copy content of Back buffer to the Front buffer.
435   bool copyBackToFront();
436
437   //! Initialize blit quad.
438   OpenGl_VertexBuffer* initBlitQuad (const Standard_Boolean theToFlip);
439
440   //! Blend together views pair into stereo image.
441   void drawStereoPair (OpenGl_FrameBuffer* theDrawFbo);
442
443   //! Check and update OIT compatibility with current OpenGL context's state.
444   bool checkOitCompatibility (const Handle(OpenGl_Context)& theGlContext,
445                               const Standard_Boolean theMSAA);
446
447   //! Chooses compatible internal color format for OIT frame buffer.
448   bool chooseOitColorConfiguration (const Handle(OpenGl_Context)& theGlContext,
449                                     const Standard_Integer theConfigIndex,
450                                     OpenGl_ColorFormats& theFormats);
451
452 protected:
453
454   OpenGl_GraphicDriver*    myDriver;
455   Handle(OpenGl_Window)    myWindow;
456   Handle(OpenGl_Workspace) myWorkspace;
457   Handle(OpenGl_Caps)      myCaps;
458   Standard_Boolean         myWasRedrawnGL;
459
460   Graphic3d_TypeOfBackfacingModel myBackfacing;
461   Quantity_ColorRGBA              myBgColor;
462   Handle(Graphic3d_SequenceOfHClipPlane) myClipPlanes;
463   Handle(Graphic3d_Camera)        myCamera;
464   gp_XYZ                          myLocalOrigin;
465   Handle(OpenGl_FrameBuffer)      myFBO;
466   Standard_Boolean                myToShowGradTrihedron;
467   TCollection_AsciiString         myBackgroundImagePath;
468   Handle(Graphic3d_TextureEnv)    myTextureEnvData;
469   Graphic3d_GraduatedTrihedron    myGTrihedronData;
470
471   Handle(Graphic3d_LightSet)      myNoShadingLight;
472   Handle(Graphic3d_LightSet)      myLights;
473   OpenGl_LayerList                myZLayers; //!< main list of displayed structure, sorted by layers
474
475   Graphic3d_WorldViewProjState    myWorldViewProjState; //!< camera modification state
476   OpenGl_StateCounter*            myStateCounter;
477   Standard_Size                   myCurrLightSourceState;
478   Standard_Size                   myLightsRevision;
479
480   typedef std::pair<Standard_Size, Standard_Size> StateInfo;
481
482   StateInfo myLastOrientationState;
483   StateInfo myLastViewMappingState;
484   StateInfo myLastLightSourceState;
485
486   //! Is needed for selection of overlapping objects and storage of the current view volume
487   OpenGl_BVHTreeSelector myBVHSelector;
488
489   OpenGl_GraduatedTrihedron myGraduatedTrihedron;
490   OpenGl_FrameStatsPrs      myFrameStatsPrs;
491
492   Handle(OpenGl_TextureSet) myTextureEnv;
493
494   //! Framebuffers for OpenGL output.
495   Handle(OpenGl_FrameBuffer) myOpenGlFBO;
496   Handle(OpenGl_FrameBuffer) myOpenGlFBO2;
497
498 protected: //! @name Rendering properties
499
500   //! Two framebuffers (left and right views) store cached main presentation
501   //! of the view (without presentation of immediate layers).
502   GLint                      myFboColorFormat;        //!< sized format for color attachments
503   GLint                      myFboDepthFormat;        //!< sized format for depth-stencil attachments
504   OpenGl_ColorFormats        myFboOitColorConfig;     //!< selected color format configuration for OIT color attachments
505   Handle(OpenGl_FrameBuffer) myMainSceneFbos[2];
506   Handle(OpenGl_FrameBuffer) myMainSceneFbosOit[2];      //!< Additional buffers for transparent draw of main layer.
507   Handle(OpenGl_FrameBuffer) myImmediateSceneFbos[2];    //!< Additional buffers for immediate layer in stereo mode.
508   Handle(OpenGl_FrameBuffer) myImmediateSceneFbosOit[2]; //!< Additional buffers for transparency draw of immediate layer.
509   OpenGl_VertexBuffer        myFullScreenQuad;        //!< Vertices for full-screen quad rendering.
510   OpenGl_VertexBuffer        myFullScreenQuadFlip;
511   Standard_Boolean           myToFlipOutput;          //!< Flag to draw result image upside-down
512   unsigned int               myFrameCounter;          //!< redraw counter, for debugging
513   Standard_Boolean           myHasFboBlit;            //!< disable FBOs on failure
514   Standard_Boolean           myToDisableOIT;          //!< disable OIT on failure
515   Standard_Boolean           myToDisableOITMSAA;      //!< disable OIT with MSAA on failure
516   Standard_Boolean           myToDisableMSAA;         //!< disable MSAA after failure
517   Standard_Boolean           myTransientDrawToFront; //!< optimization flag for immediate mode (to render directly to the front buffer)
518   Standard_Boolean           myBackBufferRestored;
519   Standard_Boolean           myIsImmediateDrawn;     //!< flag indicates that immediate mode buffer contains some data
520
521 protected: //! @name Background parameters
522
523   OpenGl_AspectFace*      myTextureParams;   //!< Stores texture and its parameters for textured background
524   OpenGl_BackgroundArray* myBgGradientArray; //!< Primitive array for gradient background
525   OpenGl_BackgroundArray* myBgTextureArray;  //!< Primitive array for texture  background
526
527 protected: //! @name data types related to ray-tracing
528
529   //! Result of OpenGL shaders initialization.
530   enum RaytraceInitStatus
531   {
532     OpenGl_RT_NONE,
533     OpenGl_RT_INIT,
534     OpenGl_RT_FAIL
535   };
536
537   //! Describes update mode (state).
538   enum RaytraceUpdateMode
539   {
540     OpenGl_GUM_CHECK,   //!< check geometry state
541     OpenGl_GUM_PREPARE, //!< collect unchanged objects
542     OpenGl_GUM_REBUILD  //!< rebuild changed and new objects
543   };
544
545   //! Defines frequently used shader variables.
546   enum ShaderVariableIndex
547   {
548     OpenGl_RT_aPosition,
549
550     // camera position
551     OpenGl_RT_uOriginLT,
552     OpenGl_RT_uOriginLB,
553     OpenGl_RT_uOriginRT,
554     OpenGl_RT_uOriginRB,
555     OpenGl_RT_uDirectLT,
556     OpenGl_RT_uDirectLB,
557     OpenGl_RT_uDirectRT,
558     OpenGl_RT_uDirectRB,
559     OpenGl_RT_uViewPrMat,
560     OpenGl_RT_uUnviewMat,
561
562     // 3D scene params
563     OpenGl_RT_uSceneRad,
564     OpenGl_RT_uSceneEps,
565     OpenGl_RT_uLightAmbnt,
566     OpenGl_RT_uLightCount,
567
568     // background params
569     OpenGl_RT_uBackColorTop,
570     OpenGl_RT_uBackColorBot,
571
572     // ray-tracing params
573     OpenGl_RT_uShadowsEnabled,
574     OpenGl_RT_uReflectEnabled,
575     OpenGl_RT_uSphereMapEnabled,
576     OpenGl_RT_uSphereMapForBack,
577     OpenGl_RT_uTexSamplersArray,
578     OpenGl_RT_uBlockedRngEnabled,
579
580     // size of render window
581     OpenGl_RT_uWinSizeX,
582     OpenGl_RT_uWinSizeY,
583
584     // sampled frame params
585     OpenGl_RT_uAccumSamples,
586     OpenGl_RT_uFrameRndSeed,
587
588     // adaptive FSAA params
589     OpenGl_RT_uOffsetX,
590     OpenGl_RT_uOffsetY,
591     OpenGl_RT_uSamples,
592
593     // images used by ISS mode
594     OpenGl_RT_uRenderImage,
595     OpenGl_RT_uOffsetImage,
596     OpenGl_RT_uTileSize,
597     OpenGl_RT_uVarianceScaleFactor,
598
599     // maximum radiance value
600     OpenGl_RT_uMaxRadiance,
601
602     OpenGl_RT_NbVariables // special field
603   };
604
605   //! Defines OpenGL image samplers.
606   enum ShaderImageNames
607   {
608     OpenGl_RT_OutputImage = 0,
609     OpenGl_RT_VisualErrorImage = 1,
610     OpenGl_RT_TileOffsetsImage = 2,
611   };
612
613   //! Tool class for management of shader sources.
614   class ShaderSource
615   {
616   public:
617
618     //! Default shader prefix - empty string.
619     static const TCollection_AsciiString EMPTY_PREFIX;
620
621     //! Creates new uninitialized shader source.
622     ShaderSource()
623     {
624       //
625     }
626
627   public:
628
629     //! Returns error description in case of load fail.
630     const TCollection_AsciiString& ErrorDescription() const
631     {
632       return myError;
633     }
634
635     //! Returns prefix to insert before the source.
636     const TCollection_AsciiString& Prefix() const
637     {
638       return myPrefix;
639     }
640
641     //! Sets prefix to insert before the source.
642     void SetPrefix (const TCollection_AsciiString& thePrefix)
643     {
644       myPrefix = thePrefix;
645     }
646
647     //! Returns shader source combined with prefix.
648     TCollection_AsciiString Source() const;
649
650     //! Loads shader source from specified files.
651     Standard_Boolean LoadFromFiles (const TCollection_AsciiString* theFileNames, const TCollection_AsciiString& thePrefix = EMPTY_PREFIX);
652
653     //! Loads shader source from specified strings.
654     Standard_Boolean LoadFromStrings (const TCollection_AsciiString* theStrings, const TCollection_AsciiString& thePrefix = EMPTY_PREFIX);
655
656   private:
657
658     TCollection_AsciiString mySource; //!< Source string of the shader object
659     TCollection_AsciiString myPrefix; //!< Prefix to insert before the source
660     TCollection_AsciiString myError;  //!< error state
661
662   };
663
664   //! Default ray-tracing depth.
665   static const Standard_Integer THE_DEFAULT_NB_BOUNCES = 3;
666
667   //! Default size of traversal stack.
668   static const Standard_Integer THE_DEFAULT_STACK_SIZE = 10;
669
670   //! Compile-time ray-tracing parameters.
671   struct RaytracingParams
672   {
673     //! Actual size of traversal stack in shader program.
674     Standard_Integer StackSize;
675
676     //! Actual ray-tracing depth (number of ray bounces).
677     Standard_Integer NbBounces;
678
679     //! Enables/disables light propagation through transparent media.
680     Standard_Boolean TransparentShadows;
681
682     //! Enables/disables global illumination (GI) effects.
683     Standard_Boolean GlobalIllumination;
684
685     //! Enables/disables the use of OpenGL bindless textures.
686     Standard_Boolean UseBindlessTextures;
687
688     //! Enables/disables two-sided BSDF models instead of one-sided.
689     Standard_Boolean TwoSidedBsdfModels;
690
691     //! Enables/disables adaptive screen sampling for path tracing.
692     Standard_Boolean AdaptiveScreenSampling;
693
694     //! Enables/disables environment map for background.
695     Standard_Boolean UseEnvMapForBackground;
696
697     //! Maximum radiance value used for clamping radiance estimation.
698     Standard_ShortReal RadianceClampingValue;
699     
700     //! Enables/disables depth-of-field effect (path tracing, perspective camera).
701     Standard_Boolean DepthOfField;
702
703     //! Tone mapping method for path tracing.
704     Graphic3d_ToneMappingMethod ToneMappingMethod;
705
706     //! Creates default compile-time ray-tracing parameters.
707     RaytracingParams()
708     : StackSize              (THE_DEFAULT_STACK_SIZE),
709       NbBounces              (THE_DEFAULT_NB_BOUNCES),
710       TransparentShadows     (Standard_False),
711       GlobalIllumination     (Standard_False),
712       UseBindlessTextures    (Standard_False),
713       TwoSidedBsdfModels     (Standard_False),
714       AdaptiveScreenSampling (Standard_False),
715       UseEnvMapForBackground (Standard_False),
716       RadianceClampingValue  (30.0),
717       DepthOfField           (Standard_False),
718       ToneMappingMethod      (Graphic3d_ToneMappingMethod_Disabled) { }
719   };
720
721   //! Describes state of OpenGL structure.
722   struct StructState
723   {
724     Standard_Size StructureState;
725     Standard_Size InstancedState;
726
727     //! Creates new structure state.
728     StructState (const Standard_Size theStructureState = 0,
729                  const Standard_Size theInstancedState = 0)
730     : StructureState (theStructureState),
731       InstancedState (theInstancedState)
732     {
733       //
734     }
735
736     //! Creates new structure state.
737     StructState (const OpenGl_Structure* theStructure)
738     {
739       StructureState = theStructure->ModificationState();
740
741       InstancedState = theStructure->InstancedStructure() != NULL ?
742         theStructure->InstancedStructure()->ModificationState() : 0;
743     }
744   };
745
746 protected: //! @name methods related to ray-tracing
747
748   //! Updates 3D scene geometry for ray-tracing.
749   Standard_Boolean updateRaytraceGeometry (const RaytraceUpdateMode      theMode,
750                                            const Standard_Integer        theViewId,
751                                            const Handle(OpenGl_Context)& theGlContext);
752
753   //! Updates 3D scene light sources for ray-tracing.
754   Standard_Boolean updateRaytraceLightSources (const OpenGl_Mat4& theInvModelView, const Handle(OpenGl_Context)& theGlContext);
755
756   //! Checks to see if the OpenGL structure is modified.
757   Standard_Boolean toUpdateStructure (const OpenGl_Structure* theStructure);
758
759   //! Adds OpenGL structure to ray-traced scene geometry.
760   Standard_Boolean addRaytraceStructure (const OpenGl_Structure*       theStructure,
761                                          const Handle(OpenGl_Context)& theGlContext);
762
763   //! Adds OpenGL groups to ray-traced scene geometry.
764   Standard_Boolean addRaytraceGroups (const OpenGl_Structure*        theStructure,
765                                       const OpenGl_RaytraceMaterial& theStructMat,
766                                       const Handle(Geom_Transformation)& theTrsf,
767                                       const Handle(OpenGl_Context)&  theGlContext);
768
769   //! Creates ray-tracing material properties.
770   OpenGl_RaytraceMaterial convertMaterial (const OpenGl_AspectFace*      theAspect,
771                                            const Handle(OpenGl_Context)& theGlContext);
772
773   //! Adds OpenGL primitive array to ray-traced scene geometry.
774   Handle(OpenGl_TriangleSet) addRaytracePrimitiveArray (const OpenGl_PrimitiveArray* theArray,
775                                                         const Standard_Integer       theMatID,
776                                                         const OpenGl_Mat4*           theTrans);
777
778   //! Adds vertex indices from OpenGL primitive array to ray-traced scene geometry.
779   Standard_Boolean addRaytraceVertexIndices (OpenGl_TriangleSet&                  theSet,
780                                              const Standard_Integer               theMatID,
781                                              const Standard_Integer               theCount,
782                                              const Standard_Integer               theOffset,
783                                              const OpenGl_PrimitiveArray&         theArray);
784
785   //! Adds OpenGL triangle array to ray-traced scene geometry.
786   Standard_Boolean addRaytraceTriangleArray (OpenGl_TriangleSet&                  theSet,
787                                              const Standard_Integer               theMatID,
788                                              const Standard_Integer               theCount,
789                                              const Standard_Integer               theOffset,
790                                              const Handle(Graphic3d_IndexBuffer)& theIndices);
791
792   //! Adds OpenGL triangle fan array to ray-traced scene geometry.
793   Standard_Boolean addRaytraceTriangleFanArray (OpenGl_TriangleSet&                  theSet,
794                                                 const Standard_Integer               theMatID,
795                                                 const Standard_Integer               theCount,
796                                                 const Standard_Integer               theOffset,
797                                                 const Handle(Graphic3d_IndexBuffer)& theIndices);
798
799   //! Adds OpenGL triangle strip array to ray-traced scene geometry.
800   Standard_Boolean addRaytraceTriangleStripArray (OpenGl_TriangleSet&                  theSet,
801                                                   const Standard_Integer               theMatID,
802                                                   const Standard_Integer               theCount,
803                                                   const Standard_Integer               theOffset,
804                                                   const Handle(Graphic3d_IndexBuffer)& theIndices);
805
806   //! Adds OpenGL quadrangle array to ray-traced scene geometry.
807   Standard_Boolean addRaytraceQuadrangleArray (OpenGl_TriangleSet&                  theSet,
808                                                const Standard_Integer               theMatID,
809                                                const Standard_Integer               theCount,
810                                                const Standard_Integer               theOffset,
811                                                const Handle(Graphic3d_IndexBuffer)& theIndices);
812
813   //! Adds OpenGL quadrangle strip array to ray-traced scene geometry.
814   Standard_Boolean addRaytraceQuadrangleStripArray (OpenGl_TriangleSet&                  theSet,
815                                                     const Standard_Integer               theMatID,
816                                                     const Standard_Integer               theCount,
817                                                     const Standard_Integer               theOffset,
818                                                     const Handle(Graphic3d_IndexBuffer)& theIndices);
819
820   //! Adds OpenGL polygon array to ray-traced scene geometry.
821   Standard_Boolean addRaytracePolygonArray (OpenGl_TriangleSet&                  theSet,
822                                             const Standard_Integer               theMatID,
823                                             const Standard_Integer               theCount,
824                                             const Standard_Integer               theOffset,
825                                             const Handle(Graphic3d_IndexBuffer)& theIndices);
826
827   //! Uploads ray-trace data to the GPU.
828   Standard_Boolean uploadRaytraceData (const Handle(OpenGl_Context)& theGlContext);
829
830   //! Generates shader prefix based on current ray-tracing options.
831   TCollection_AsciiString generateShaderPrefix (const Handle(OpenGl_Context)& theGlContext) const;
832
833   //! Performs safe exit when shaders initialization fails.
834   Standard_Boolean safeFailBack (const TCollection_ExtendedString& theMessage,
835                                  const Handle(OpenGl_Context)&     theGlContext);
836
837   //! Loads and compiles shader object from specified source.
838   Handle(OpenGl_ShaderObject) initShader (const GLenum                  theType,
839                                           const ShaderSource&           theSource,
840                                           const Handle(OpenGl_Context)& theGlContext);
841
842   //! Creates shader program from the given vertex and fragment shaders.
843   Handle(OpenGl_ShaderProgram) initProgram (const Handle(OpenGl_Context)&      theGlContext,
844                                             const Handle(OpenGl_ShaderObject)& theVertShader,
845                                             const Handle(OpenGl_ShaderObject)& theFragShader);
846
847   //! Initializes OpenGL/GLSL shader programs.
848   Standard_Boolean initRaytraceResources (const Standard_Integer theSizeX,
849                                           const Standard_Integer theSizeY,
850                                           const Handle(OpenGl_Context)& theGlContext);
851
852   //! Releases OpenGL/GLSL shader programs.
853   void releaseRaytraceResources (const Handle(OpenGl_Context)& theGlContext,
854                                  const Standard_Boolean        theToRebuild = Standard_False);
855
856   //! Updates auxiliary OpenGL frame buffers.
857   Standard_Boolean updateRaytraceBuffers (const Standard_Integer        theSizeX,
858                                           const Standard_Integer        theSizeY,
859                                           const Handle(OpenGl_Context)& theGlContext);
860
861   //! Generates viewing rays for corners of screen quad.
862   //! (ray tracing; path tracing for orthographic camera)
863   void updateCamera (const OpenGl_Mat4& theOrientation,
864                      const OpenGl_Mat4& theViewMapping,
865                      OpenGl_Vec3*       theOrigins,
866                      OpenGl_Vec3*       theDirects,
867                      OpenGl_Mat4&       theView,
868                      OpenGl_Mat4&       theUnView);
869
870   //! Generate viewing rays (path tracing, perspective camera).
871   void updatePerspCameraPT(const OpenGl_Mat4&           theOrientation,
872                            const OpenGl_Mat4&           theViewMapping,
873                            Graphic3d_Camera::Projection theProjection,
874                            OpenGl_Mat4&                 theViewPr,
875                            OpenGl_Mat4&                 theUnview,
876                            const int                    theWinSizeX,
877                            const int                    theWinSizeY);
878
879   //! Binds ray-trace textures to corresponding texture units.
880   void bindRaytraceTextures (const Handle(OpenGl_Context)& theGlContext,
881                              int theStereoView);
882
883   //! Unbinds ray-trace textures from corresponding texture unit.
884   void unbindRaytraceTextures (const Handle(OpenGl_Context)& theGlContext);
885
886   //! Sets uniform state for the given ray-tracing shader program.
887   Standard_Boolean setUniformState (const Standard_Integer        theProgramId,
888                                     const Standard_Integer        theSizeX,
889                                     const Standard_Integer        theSizeY,
890                                     Graphic3d_Camera::Projection  theProjection,
891                                     const Handle(OpenGl_Context)& theGlContext);
892
893   //! Runs ray-tracing shader programs.
894   Standard_Boolean runRaytraceShaders (const Standard_Integer        theSizeX,
895                                        const Standard_Integer        theSizeY,
896                                        Graphic3d_Camera::Projection  theProjection,
897                                        OpenGl_FrameBuffer*           theReadDrawFbo,
898                                        const Handle(OpenGl_Context)& theGlContext);
899
900   //! Runs classical (Whitted-style) ray-tracing kernel.
901   Standard_Boolean runRaytrace (const Standard_Integer        theSizeX,
902                                 const Standard_Integer        theSizeY,
903                                 Graphic3d_Camera::Projection  theProjection,
904                                 OpenGl_FrameBuffer*           theReadDrawFbo,
905                                 const Handle(OpenGl_Context)& theGlContext);
906
907   //! Runs path tracing (global illumination) kernel.
908   Standard_Boolean runPathtrace (const Standard_Integer        theSizeX,
909                                  const Standard_Integer        theSizeY,
910                                  Graphic3d_Camera::Projection  theProjection,
911                                  const Handle(OpenGl_Context)& theGlContext);
912
913   //! Runs path tracing (global illumination) kernel.
914   Standard_Boolean runPathtraceOut (Graphic3d_Camera::Projection  theProjection,
915                                     OpenGl_FrameBuffer*           theReadDrawFbo,
916                                     const Handle(OpenGl_Context)& theGlContext);
917
918   //! Redraws the window using OpenGL/GLSL ray-tracing or path tracing.
919   Standard_Boolean raytrace (const Standard_Integer        theSizeX,
920                              const Standard_Integer        theSizeY,
921                              Graphic3d_Camera::Projection  theProjection,
922                              OpenGl_FrameBuffer*           theReadDrawFbo,
923                              const Handle(OpenGl_Context)& theGlContext);
924
925 protected: //! @name fields related to ray-tracing
926
927   //! Result of RT/PT shaders initialization.
928   RaytraceInitStatus myRaytraceInitStatus;
929
930   //! Is ray-tracing geometry data valid?
931   Standard_Boolean myIsRaytraceDataValid;
932
933   //! True if warning about missing extension GL_ARB_bindless_texture has been displayed.
934   Standard_Boolean myIsRaytraceWarnTextures;
935
936   //! 3D scene geometry data for ray-tracing.
937   OpenGl_RaytraceGeometry myRaytraceGeometry;
938
939   //! Builder for triangle set.
940   opencascade::handle<BVH_Builder<Standard_ShortReal, 3> > myRaytraceBVHBuilder;
941
942   //! Compile-time ray-tracing parameters.
943   RaytracingParams myRaytraceParameters;
944
945   //! Radius of bounding sphere of the scene.
946   Standard_ShortReal myRaytraceSceneRadius;
947   //! Scene epsilon to prevent self-intersections.
948   Standard_ShortReal myRaytraceSceneEpsilon;
949
950   //! OpenGL/GLSL source of ray-tracing fragment shader.
951   ShaderSource myRaytraceShaderSource;
952   //! OpenGL/GLSL source of adaptive-AA fragment shader.
953   ShaderSource myPostFSAAShaderSource;
954   //! OpenGL/GLSL source of RT/PT display fragment shader.
955   ShaderSource myOutImageShaderSource;
956
957   //! OpenGL/GLSL ray-tracing fragment shader.
958   Handle(OpenGl_ShaderObject) myRaytraceShader;
959   //! OpenGL/GLSL adaptive-AA fragment shader.
960   Handle(OpenGl_ShaderObject) myPostFSAAShader;
961   //! OpenGL/GLSL ray-tracing display fragment shader.
962   Handle(OpenGl_ShaderObject) myOutImageShader;
963
964   //! OpenGL/GLSL ray-tracing shader program.
965   Handle(OpenGl_ShaderProgram) myRaytraceProgram;
966   //! OpenGL/GLSL adaptive-AA shader program.
967   Handle(OpenGl_ShaderProgram) myPostFSAAProgram;
968   //! OpenGL/GLSL program for displaying texture.
969   Handle(OpenGl_ShaderProgram) myOutImageProgram;
970
971   //! Texture buffer of data records of bottom-level BVH nodes.
972   Handle(OpenGl_TextureBufferArb) mySceneNodeInfoTexture;
973   //! Texture buffer of minimum points of bottom-level BVH nodes.
974   Handle(OpenGl_TextureBufferArb) mySceneMinPointTexture;
975   //! Texture buffer of maximum points of bottom-level BVH nodes.
976   Handle(OpenGl_TextureBufferArb) mySceneMaxPointTexture;
977   //! Texture buffer of transformations of high-level BVH nodes.
978   Handle(OpenGl_TextureBufferArb) mySceneTransformTexture;
979
980   //! Texture buffer of vertex coords.
981   Handle(OpenGl_TextureBufferArb) myGeometryVertexTexture;
982   //! Texture buffer of vertex normals.
983   Handle(OpenGl_TextureBufferArb) myGeometryNormalTexture;
984   //! Texture buffer of vertex UV coords.
985   Handle(OpenGl_TextureBufferArb) myGeometryTexCrdTexture;
986   //! Texture buffer of triangle indices.
987   Handle(OpenGl_TextureBufferArb) myGeometryTriangTexture;
988
989   //! Texture buffer of material properties.
990   Handle(OpenGl_TextureBufferArb) myRaytraceMaterialTexture;
991   //! Texture buffer of light source properties.
992   Handle(OpenGl_TextureBufferArb) myRaytraceLightSrcTexture;
993
994   //! 1st framebuffer (FBO) to perform adaptive FSAA.
995   //! Used in compatibility mode (no adaptive sampling).
996   Handle(OpenGl_FrameBuffer) myRaytraceFBO1[2];
997   //! 2nd framebuffer (FBO) to perform adaptive FSAA.
998   //! Used in compatibility mode (no adaptive sampling).
999   Handle(OpenGl_FrameBuffer) myRaytraceFBO2[2];
1000
1001   //! Output textures (2 textures are used in stereo mode).
1002   //! Used if adaptive screen sampling is activated.
1003   Handle(OpenGl_Texture) myRaytraceOutputTexture[2];
1004
1005   //! Texture containing per-tile visual error estimation (2 textures are used in stereo mode).
1006   //! Used if adaptive screen sampling is activated.
1007   Handle(OpenGl_Texture) myRaytraceVisualErrorTexture[2];
1008   //! Texture containing offsets of sampled screen tiles (2 textures are used in stereo mode).
1009   //! Used if adaptive screen sampling is activated.
1010   Handle(OpenGl_Texture) myRaytraceTileOffsetsTexture[2];
1011
1012   //! Vertex buffer (VBO) for drawing dummy quad.
1013   OpenGl_VertexBuffer myRaytraceScreenQuad;
1014
1015   //! Cached locations of frequently used uniform variables.
1016   Standard_Integer myUniformLocations[2][OpenGl_RT_NbVariables];
1017
1018   //! State of OpenGL structures reflected to ray-tracing.
1019   std::map<const OpenGl_Structure*, StructState> myStructureStates;
1020
1021   //! PrimitiveArray to TriangleSet map for scene partial update.
1022   std::map<Standard_Size, OpenGl_TriangleSet*> myArrayToTrianglesMap;
1023
1024   //! Set of IDs of non-raytracable elements (to detect updates).
1025   std::set<Standard_Integer> myNonRaytraceStructureIDs;
1026
1027   //! Marks if environment map should be updated.
1028   Standard_Boolean myToUpdateEnvironmentMap;
1029
1030   //! State of OpenGL layer list.
1031   Standard_Size myRaytraceLayerListState;
1032
1033   //! Number of accumulated frames (for progressive rendering).
1034   Standard_Integer myAccumFrames;
1035
1036   //! Stored ray origins used for detection of camera movements.
1037   OpenGl_Vec3 myPreviousOrigins[3];
1038
1039   //! Bullard RNG to produce random sequence.
1040   math_BullardGenerator myRNG;
1041
1042   //! Tool object for sampling screen tiles in PT mode.
1043   OpenGl_TileSampler myTileSampler;
1044
1045   //! Camera position used for projective mode
1046   OpenGl_Vec3 myEyeOrig;
1047
1048   //! Camera view direction used for projective mode
1049   OpenGl_Vec3 myEyeView;
1050
1051   //! Camera's screen vertical direction used for projective mode
1052   OpenGl_Vec3 myEyeVert;
1053
1054   //! Camera's screen horizontal direction used for projective mode
1055   OpenGl_Vec3 myEyeSide;
1056
1057   //! Camera's screen size used for projective mode
1058   OpenGl_Vec2 myEyeSize;
1059
1060   //! Aperture radius of camera on previous frame used for depth-of-field (path tracing)
1061   float myPrevCameraApertureRadius;
1062
1063   //! Focal distance of camera on previous frame used for depth-of-field (path tracing)
1064   float myPrevCameraFocalPlaneDist;
1065
1066 public:
1067
1068   DEFINE_STANDARD_ALLOC
1069   DEFINE_STANDARD_RTTIEXT(OpenGl_View,Graphic3d_CView) // Type definition
1070
1071   friend class OpenGl_GraphicDriver;
1072   friend class OpenGl_Workspace;
1073   friend class OpenGl_LayerList;
1074   friend class OpenGl_FrameStats;
1075 };
1076
1077 #endif // _OpenGl_View_Header