1 // Created on: 2011-08-05
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
8 // under the terms of the GNU Lesser General Public 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_Element_Header
17 #define OpenGl_Element_Header
19 #include <Handle_OpenGl_Context.hxx>
20 #include <Handle_OpenGl_Workspace.hxx>
21 #include <OpenGl_RenderFilter.hxx>
23 //! Base interface for drawable elements.
28 Standard_EXPORT OpenGl_Element();
30 virtual void Render (const Handle(OpenGl_Workspace)& theWorkspace) const = 0;
32 //! Release GPU resources.
33 virtual void Release (const Handle(OpenGl_Context)& theContext) = 0;
35 template <typename theResource_t>
36 static void Destroy (const Handle(OpenGl_Context)& theContext,
37 theResource_t*& theElement)
39 if (theElement == NULL)
44 theElement->Release (theContext);
45 OpenGl_Element* anElement = theElement;
52 //! Render element if it passes the filtering procedure. This method should
53 //! be used for elements which can be used in scope of rendering algorithms.
54 //! E.g. elements of groups during recursive rendering.
55 //! If render filter is null, pure rendering is performed.
56 //! @param theWorkspace [in] the rendering workspace.
57 //! @param theFilter [in] the rendering filter to check whether the element
58 //! should be rendered or not.
59 //! @return True if element passes the filering check and is rendered.
60 inline Standard_Boolean
61 RenderFiltered (const Handle(OpenGl_Workspace)& theWorkspace,
62 const Handle(OpenGl_RenderFilter)& theFilter) const
64 if (!theFilter.IsNull() && !theFilter->CanRender (this))
66 return Standard_False;
69 Render (theWorkspace);
76 Standard_EXPORT virtual ~OpenGl_Element();
84 #endif // OpenGl_Element_Header