1 // Copyright (c) 2017 OPEN CASCADE SAS
3 // This file is part of Open CASCADE Technology software library.
5 // This library is free software; you can redistribute it and/or modify it under
6 // the terms of the GNU Lesser General Public License version 2.1 as published
7 // by the Free Software Foundation, with special exception defined in the file
8 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
9 // distribution for complete text of the license and disclaimer of any warranty.
11 // Alternatively, this file may be used under the terms of Open CASCADE
12 // commercial license or contractual agreement.
14 #ifndef _OpenGl_FrameStats_HeaderFile
15 #define _OpenGl_FrameStats_HeaderFile
17 #include <Graphic3d_RenderingParams.hxx>
18 #include <NCollection_IndexedMap.hxx>
19 #include <OSD_Timer.hxx>
20 #include <Standard_Type.hxx>
21 #include <Standard_Transient.hxx>
23 class OpenGl_Workspace;
24 class OpenGl_Structure;
25 typedef NCollection_IndexedMap<const OpenGl_Structure*> OpenGl_IndexedMapOfStructure;
27 //! Class storing the frame statistics.
28 class OpenGl_FrameStats : public Standard_Transient
30 DEFINE_STANDARD_RTTIEXT(OpenGl_FrameStats, Standard_Transient)
36 Counter_NbLayers = 0, //!< number of ZLayers
37 Counter_NbLayersNotCulled, //!< number of not culled ZLayers
38 Counter_NbStructs, //!< number of defined OpenGl_Structure
39 Counter_NbStructsNotCulled, //!< number of not culled OpenGl_Structure
40 Counter_NbGroupsNotCulled, //!< number of not culled OpenGl_Group
41 Counter_NbElemsNotCulled, //!< number of not culled OpenGl_Element
42 Counter_NbElemsFillNotCulled, //!< number of not culled OpenGl_PrimitiveArray drawing triangles
43 Counter_NbElemsLineNotCulled, //!< number of not culled OpenGl_PrimitiveArray drawing lines
44 Counter_NbElemsPointNotCulled, //!< number of not culled OpenGl_PrimitiveArray drawing points
45 Counter_NbElemsTextNotCulled, //!< number of not culled OpenGl_Text
46 Counter_NbTrianglesNotCulled, //!< number of not culled (as structure) triangles
47 Counter_NbPointsNotCulled, //!< number of not culled (as structure) points
48 Counter_EstimatedBytesGeom, //!< estimated GPU memory used for geometry
49 Counter_EstimatedBytesFbos, //!< estimated GPU memory used for FBOs
50 Counter_EstimatedBytesTextures, //!< estimated GPU memory used for textures
52 enum { Counter_NB = Counter_EstimatedBytesTextures + 1 };
56 //! Default constructor.
57 Standard_EXPORT OpenGl_FrameStats();
60 Standard_EXPORT virtual ~OpenGl_FrameStats();
62 //! Returns interval in seconds for updating meters across several frames; 1 second by default.
63 Standard_Real UpdateInterval() const { return myUpdateInterval; }
65 //! Sets interval in seconds for updating values.
66 void SetUpdateInterval (Standard_Real theInterval) { myUpdateInterval = theInterval; }
68 //! Prefer longer lines over more greater of lines.
69 Standard_Boolean IsLongLineFormat() const { return myIsLongLineFormat; }
71 //! Set if format should prefer longer lines over greater number of lines.
72 void SetLongLineFormat (Standard_Boolean theValue) { myIsLongLineFormat = theValue; }
74 //! Frame redraw started.
75 Standard_EXPORT virtual void FrameStart (const Handle(OpenGl_Workspace)& theWorkspace = Handle(OpenGl_Workspace)());
77 //! Frame redraw finished.
78 Standard_EXPORT virtual void FrameEnd (const Handle(OpenGl_Workspace)& theWorkspace = Handle(OpenGl_Workspace)());
82 //! Returns formatted string.
83 Standard_EXPORT virtual TCollection_AsciiString FormatStats (Graphic3d_RenderingParams::PerfCounters theFlags) const;
85 //! Returns duration of the last frame in seconds.
86 Standard_Real FrameDuration() const { return myFrameDuration; }
88 //! Returns FPS (frames per seconds, elapsed time).
89 //! This number indicates an actual frame rate averaged for several frames within UpdateInterval() duration,
90 //! basing on a real elapsed time between updates.
91 Standard_Real FrameRate() const { return myFps; }
93 //! Returns CPU FPS (frames per seconds, CPU time).
94 //! This number indicates a PREDICTED frame rate,
95 //! basing on CPU elapsed time between updates and NOT real elapsed time (which might include periods of CPU inactivity).
96 //! Number is expected to be greater then actual frame rate returned by FrameRate().
97 //! Values significantly greater actual frame rate indicate that rendering is limited by GPU performance (CPU is stalled in-between),
98 //! while values around actual frame rate indicate rendering being limited by CPU performance (GPU is stalled in-between).
99 Standard_Real FrameRateCpu() const { return myFpsCpu; }
101 //! Returns value of specified counter, cached between stats updates.
102 //! Should NOT be called between ::FrameStart() and ::FrameEnd() calls.
103 Standard_Size CounterValue (OpenGl_FrameStats::Counter theCounter) const { return myCounters[theCounter]; }
105 //! Returns TRUE if some Layers have been culled.
106 Standard_Boolean HasCulledLayers() const { return myCounters[Counter_NbLayersNotCulled] != myCounters[Counter_NbLayers]; }
108 //! Returns TRUE if some structures have been culled.
109 Standard_Boolean HasCulledStructs() const { return myCounters[Counter_NbStructsNotCulled] != myCounters[Counter_NbStructs]; }
113 //! Returns TRUE if this stats are equal to another.
114 virtual Standard_Boolean IsEqual (const Handle(OpenGl_FrameStats)& theOther) const
116 // check just a couple of major counters
117 return Abs (myFps - theOther->myFps) <= 0.001
118 && Abs (myFpsCpu - theOther->myFpsCpu) <= 0.001
119 && myCounters[Counter_NbLayers] == theOther->myCounters[Counter_NbLayers]
120 && myCounters[Counter_NbLayersNotCulled] == theOther->myCounters[Counter_NbLayersNotCulled]
121 && myCounters[Counter_NbStructs] == theOther->myCounters[Counter_NbStructs]
122 && myCounters[Counter_NbStructsNotCulled] == theOther->myCounters[Counter_NbStructsNotCulled];
125 //! Copy stats values from another instance
126 virtual void CopyFrom (const Handle(OpenGl_FrameStats)& theOther)
128 myFps = theOther->myFps;
129 myFpsCpu = theOther->myFpsCpu;
130 memcpy (myCounters, theOther->myCounters, sizeof(myCounters));
133 //! Returns value of specified counter for modification, should be called between ::FrameStart() and ::FrameEnd() calls.
134 Standard_Size& ChangeCounter (OpenGl_FrameStats::Counter theCounter) { return myCountersTmp[theCounter]; }
138 //! Updates counters for structures.
139 Standard_EXPORT virtual void updateStructures (Standard_Integer theViewId,
140 const OpenGl_IndexedMapOfStructure& theStructures,
141 Standard_Boolean theToCountElems,
142 Standard_Boolean theToCountTris,
143 Standard_Boolean theToCountMem);
147 OSD_Timer myFpsTimer; //!< timer for FPS measurements
148 Standard_Real myFrameStartTime; //!< time at the beginning of frame redraw
149 Standard_Real myFrameDuration; //!< frame duration
150 Standard_Real myFps; //!< FPS meter (frames per seconds, elapsed time)
151 Standard_Real myFpsCpu; //!< CPU FPS meter (frames per seconds, CPU time)
152 Standard_Real myUpdateInterval; //!< interval to update meters
153 Standard_Size myFpsFrameCount; //!< FPS counter (within short measurement time slice)
154 Standard_Size myCounters [Counter_NB]; //!< counter values cached between updates
155 Standard_Size myCountersTmp[Counter_NB]; //!< counter values filled during
156 Standard_Boolean myIsLongLineFormat; //!< prefer longer lines over greater number of lines
160 DEFINE_STANDARD_HANDLE(OpenGl_FrameStats, Standard_Transient)
162 #endif // _OpenGl_FrameStats_HeaderFile