1 // Created on: 2011-07-13
2 // Created by: Sergey ZERCHANINOV
3 // Copyright (c) 2011-2014 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_PrimitiveArray_Header
17 #define OpenGl_PrimitiveArray_Header
19 #include <OpenGl_IndexBuffer.hxx>
21 #include <InterfaceGraphic_Graphic3d.hxx>
22 #include <Aspect_InteriorStyle.hxx>
23 #include <Aspect_TypeOfMarker.hxx>
24 #include <Graphic3d_TypeOfPrimitiveArray.hxx>
25 #include <Graphic3d_IndexBuffer.hxx>
26 #include <Graphic3d_BoundBuffer.hxx>
28 #include <OpenGl_Element.hxx>
30 class OpenGl_GraphicDriver;
31 class Handle(OpenGl_ShaderProgram);
33 //! Class for rendering of arbitrary primitive array.
34 class OpenGl_PrimitiveArray : public OpenGl_Element
37 // OpenGL does not provide a constant for "none" draw mode.
38 // So we define our own one that does not conflict with GL constants
39 // and utilizes common GL invalid value
46 Standard_EXPORT OpenGl_PrimitiveArray (const OpenGl_GraphicDriver* theDriver);
48 //! Default constructor
49 Standard_EXPORT OpenGl_PrimitiveArray (const OpenGl_GraphicDriver* theDriver,
50 const Graphic3d_TypeOfPrimitiveArray theType,
51 const Handle(Graphic3d_IndexBuffer)& theIndices,
52 const Handle(Graphic3d_Buffer)& theAttribs,
53 const Handle(Graphic3d_BoundBuffer)& theBounds);
56 Standard_EXPORT virtual ~OpenGl_PrimitiveArray();
58 //! Render primitives to the window
59 Standard_EXPORT virtual void Render (const Handle(OpenGl_Workspace)& theWorkspace) const;
61 //! Release OpenGL resources (VBOs)
62 Standard_EXPORT virtual void Release (OpenGl_Context* theContext);
64 //! Return true if VBOs initialization has been performed.
65 //! VBO initialization is performed during first Render() call.
66 //! Notice that this flag does not indicate VBOs validity.
67 Standard_Boolean IsInitialized() const { return myIsVboInit; }
69 //! Invalidate VBO content without destruction.
70 void Invalidate() const { myIsVboInit = Standard_False; }
72 //! @return primitive type (GL_LINES, GL_TRIANGLES and others)
73 GLint DrawMode() const { return myDrawMode; }
75 //! @return indices array
76 const Handle(Graphic3d_IndexBuffer)& Indices() const { return myIndices; }
78 //! @return attributes array
79 const Handle(Graphic3d_Buffer)& Attributes() const { return myAttribs; }
81 //! @return bounds array
82 const Handle(Graphic3d_BoundBuffer)& Bounds() const { return myBounds; }
84 //! Returns unique ID of primitive array.
85 const Standard_Size GetUID() const { return myUID; }
87 //! Initialize indices, attributes and bounds with new data.
88 Standard_EXPORT void InitBuffers (const Handle(OpenGl_Context)& theContext,
89 const Graphic3d_TypeOfPrimitiveArray theType,
90 const Handle(Graphic3d_IndexBuffer)& theIndices,
91 const Handle(Graphic3d_Buffer)& theAttribs,
92 const Handle(Graphic3d_BoundBuffer)& theBounds);
96 //! VBO initialization procedures
97 //! @param theCtx bound GL context
98 //! @param theToKeepData when true, myAttribs will not be nullified after VBO creation
99 Standard_EXPORT Standard_Boolean buildVBO (const Handle(OpenGl_Context)& theCtx,
100 const Standard_Boolean theToKeepData) const;
102 Standard_EXPORT void clearMemoryGL (const Handle(OpenGl_Context)& theGlCtx) const;
106 //! Initialize normal (OpenGL-provided) VBO
107 Standard_Boolean initNormalVbo (const Handle(OpenGl_Context)& theCtx) const;
109 //! Main procedure to draw array
110 void drawArray (const Handle(OpenGl_Workspace)& theWorkspace,
111 const Graphic3d_Vec4* theFaceColors,
112 const Standard_Boolean theHasVertColor) const;
114 //! Auxiliary procedures
115 void drawEdges (const TEL_COLOUR* theEdgeColour,
116 const Handle(OpenGl_Workspace)& theWorkspace) const;
118 void drawMarkers (const Handle(OpenGl_Workspace)& theWorkspace) const;
120 //! Sets OpenGL draw mode according to the input type of primitive array.
121 //! If buffer of attributes is empty, draw mode is set to NONE to avoid invalid array rendering.
122 //! @param theType type of primitive array.
123 void setDrawMode (const Graphic3d_TypeOfPrimitiveArray theType);
125 //! Rebuilds the array of vertex attributes so that it can be drawn without indices.
126 Standard_Boolean processIndices (const Handle(OpenGl_Context)& theContext) const;
130 mutable Handle(OpenGl_VertexBuffer) myVboIndices;
131 mutable Handle(OpenGl_VertexBuffer) myVboAttribs;
133 mutable Handle(Graphic3d_IndexBuffer) myIndices;
134 mutable Handle(Graphic3d_Buffer) myAttribs;
135 mutable Handle(Graphic3d_BoundBuffer) myBounds;
137 mutable Standard_Boolean myIsVboInit;
139 Standard_Size myUID; //!< Unique ID of primitive array.
143 DEFINE_STANDARD_ALLOC
147 #endif //OpenGl_PrimitiveArray_Header